NC0004774_CSA Report Appx A_Introduction_20150823

Introduction
• NCDENR NORR Letter
• Summary of Work Plan Submittals and
NCDENR-Duke Energy
Correspondence
• Revised Groundwater Assessment
Work Plan

NCDENR NORR Letter

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NCDENR
North Carolina Department of Environment and Natural Resources
Pat McCrory John E. Skvarla, III
Governor Secretary
August 13, 2014
CERTIFIED MAIL 7004 2510 0000 3651 1168
RETURN RECEIPT REQUESTED
Paul Newton
Duke Energy
526 South Church Street
Charlotte, NC 28202
Subject: Notice of Regulatory Requirements
Title 15A North Carolina Administrative Code (NCAC) 02L .0106
14 Coal Ash Facilities in North Carolina
Dear Mr. Newton:
Chapter 143, North Carolina General Statutes, authorizes and directs the Environmental
Management Commission of the Department of Environment and Natural Resources to protect
and preserve the water and air resources of the State. The Division of Water Resources (DWR)
has the delegated authority to enforce adopted pollution control rules.
Rule 15A NCAC 02L .0103(d) states that no person shall conduct or cause to be conducted any
activity which causes the concentration of any substance to exceed that specified in 15A NCAC
02L .0202. As of the date of this letter, exceedances of the groundwater quality standards at 15A
NCAC 02L .0200 Classifications and Water Quality Standards Applicable to the Groundwaters
of North Carolina have been reported at each of the subject coal ash facilities owned and
operated by Duke Energy (herein referred to as Duke).
Groundwater Assessment Plans
No later than September, 26 2014 Duke Energy shall submit to the Division of Water Resources
plans establishing proposed site assessment activities and schedules for the implementation,
completion, and submission of a comprehensive site assessment (CSA) report for each of the
following facilities in accordance with 15A NCAC 02L .0106(g):
Asheville Steam Electric Generating Plant
Belews Creek Steam Station
Buck Steam Station
Cape Fear Steam Electric Generating Plant
Cliffside Steam Station
1636 Mail Service Center, Raleigh, North Carolina 27699-1636
Phone: [phone] Internet: www.ncdenr.gov
An Equal Opportunity 1 Affirmative Action Employer— Made in part by recycled paper

Mr. Paul Newton
August 12, 2014
Page 2 of 3
Dan River Combined Cycle Station
H.F. Lee Steam Electric Plant
Marshall Steam Station
Mayo Steam Electric Generating Plant
Plant Allen Steam Station
Riverbend Steam Station
Roxboro Steam Electric Generating Plant
L.V. Sutton Electric Plant
Weatherspoon Steam Electric Plant
The site assessment plans shall include a description of the activities proposed to be completed
by Duke that are necessary to meet the requirements of 15A NCAC 02L .0106(g) and to provide
information concerning the following:
(1) the source and cause of contamination;
(2) any imminent hazards to public health and safety and actions taken to mitigate
them in accordance to 15A NCAC 02L .0106(f);
(3) all receptors, and significant exposure pathways;
(4) the horizontal and vertical extent of soil and groundwater contamination and all
significant factors affecting contaminant transport; and
(5) geological and hydrogeological features influencing the movement,. chemical, and
physical character of the contaminants.
For your convenience, we have attached guidelines detailing the information necessary for the
preparation of a CSA report. The DWR will review the plans and provide Duke with review
comments, either approving the plans or noting any deficiencies to be corrected, and a date by
which a corrected plan is to be submitted for further review and comment or approval. For those
facilities for which Duke has already submitted groundwater assessment plans, please update
your submittals to ensure they meet the requirements stated in this letter and referenced
attachments and submit them with the others.
Receptor Survey
No later than October 14t', 2104 as authorized pursuant to 15A NCAC 02L .0106(g), the DWR is
requesting that Duke perform a receptor survey at each of the subject facilities and submitted to
the DWR. The receptor survey is required by 15A NCAC 02L .0106(g) and shall include
identification of all receptors within a radius of 2,640 feet (one-half mile) from the established
compliance boundary identified in the respective National Pollutant Discharge Elimination
System (NPDES) permits. Receptors shall include, but shall not be limited to, public and private
water supply wells (including irrigation wells and unused or abandoned wells) and surface water
features within one-half mile of the facility compliance boundary. For those facilities for which
Duke has already submitted a receptor survey, please update your submittals to ensure they meet
the requirements stated in this letter and referenced attachments and submit them with the others.
If they do not meet these requirements, you must modify and resubmit the plans.

Mr. Paul Newton
August 12, 2014
Page 3 of 3
The results of the receptor survey shall be presented on a sufficiently scaled map. The map shall
show the coal ash facility location, the facility property boundary, the waste and compliance
boundaries, and all monitoring wells listed in the respective NPDES permits. Any identified
water supply wells shall be located on the map and shall have the well owner's name and
location address listed on a separate table that can be matched to its location on the map.
Failure to comply with the State's rules in the manner and time specified may result in the
assessment of civil penalties and/or the use of other enforcement mechanisms available to the
State.
We appreciate your attention and prompt response in this matter. If you have any questions,
please feel free to contact S. Jay Zimmerman, Water Quality Regional Operations Section Chief,
at [phone].
2hn
ierely,
E. Skvarla, III
Attachment enclosed
cc: Thomas A. Reeder, Director, Division of Water Resources
Regional Offices — WQROS
File Copy

August 12, 2014
GUIDELINES FOR COMPREHENSIVE SITE ASSESSMENT
This document provides guidelines for those involved in the investigation of
contaminated soil and/or groundwater, where the source of contamination is from:
■ Incidents caused by activities subject to permitting under G.S. 143-215.1
■ Incidents caused by activities subject to permitting under G.S. 87-88
■ Incidents arising from agricultural operations, including application of
agricultural chemicals, but not including unlawful discharges, spills or
disposal of such chemicals
Comprehensive Site Assessment (CSA)
NOTE: Regional Offices may request additional information in support of the CSA to aid
in their review and will not approve the CSA if any of the elements specified below have
not been included or have not been sufficiently addressed
Minimum Elements of the Comprehensive Site Assessment Report:
A. Title Page
• Site name, location and Groundwater Incident number (if
assigned) and Permit Number;
• Date of report;
• Responsible Party and/or permiee, including address and
phone number;
• Current property owner including address and phone
number;
• Consultant/contractor information including address and
phone number;
• Latitude and longitude of the facility; and
• Seal and signature of certifying P.E. or P.G., as appropriate.
B. Executive Summary
The Executive Summary should provide a brief overview of the pertinent
site information (i.e., provide sufficient information to acquaint the reader
with the who, what, when, where, why and how for site activities to date).
1. Source information:
Type of contaminants
2. Initial abatement/emergency response information.
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August 12, 2014
3. Receptor information:
•
Water supply wells;
•
Public water supplies (wells, surface water intakes);
•
Surface water bodies;
•
Wellhead protection areas;
•
Deep aquifers in the Coastal Plain physiographic region;
•
Subsurface structures; and
•
Land use.
4. Sampling/investigation results:
•
Nature and extent of contamination;
•
Maximum contaminant concentrations;
•
Site hydrogeology.
5. Conclusions
and recommendations.
C. Table of Contents
• First page number for each section listed.
• List of figures (all referenced by number and placed in a
single section following contents text).
• List of tables (all referenced by number and placed in a single
section following contents text).
• List of appendices.
D. Site History and Source Characterization
• Provide a history of property ownership and use. Indicate
dates of ownership, uses of the site, and potential sources of
contaminants.
• Discuss the source(s) of contamination, including primary
and secondary sources.
• For permitted activities, describe nature of activity, permitted
waste, application of all instances of
over-application/irrigation of wastes or water
• Summarize assessment activities and corrective actions
performed to date including emergency response, initial
abatement, primary and secondary source removal.
• Discuss geographical setting and present/future surrounding
land uses.
E. Receptor Information
Provide a site map showing labeled well locations within a

August 12, 2014
minimum of 1500 feet of the known extent of contamination.
Key to the table and maps described.
NOTE: As the known extent of contamination changes, the
receptor survey must be updated to reflect the change. This
applies throughout the Receptor Information section.
• In table format, list all water supply wells, public or private,
including irrigation wells and unused wells, (omit those that
have been properly abandoned in accordance with 15A
NCAC 2C .0100) within a minimum of 1500 feet of the known
extent of contamination. Note whether well users are also
served by a municipal water supply.
• For each well, include well number, well owner and user
names, addresses and telephone numbers, use of the well,
well depth, well casing depth, well screen interval, and
distance from source of contamination;
NOTE: It will often be necessary to conduct any or all of the
following in order to ensure reliability in a water supply well
survey.
o Call the city/county water department to inquire about
city water connections,
o Visit door-to-door (make sure that you introduce
yourself and state your purpose to residents prior to
examining their property) to obtain accurate
description of water usage, and if some residents are
not at home, ask surrounding neighbors who are
home about the water usage at those residences.
Even if a public water line is available, some
residents still use their well water and are not
connected to the public water system; and
o Search for water meters and well houses.
• Site map showing location of subsurface structures (e.g.,
sewers, utility lines, conduits, basements, septic tanks,
drain fields, etc.) within a minimum of 1,500 feet of the known
extent of contamination;
• Table of surrounding property owner addresses;
• Discuss the availability of public water supplies within a
minimum of 1,500 feet of the source area, including the
distance and location to the nearest public water lines and
the source(s) of the public water supply;
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August 12, 2014
• Identify all surface water bodies (e.g., ditch, pond, stream,
lake, river) within a minimum of 1,500 feet of the source of
contamination;
• Determine the location of any designated wellhead protection
areas as defined in 42 USC 300h-7(e) within a minimum of
1,500 feet of the source of contamination. Identify and
discuss the location of the water supply well(s) for which the
area was designated a wellhead protection area, and the
extent of the protected area. Include information about the
well owner, well -construction specifications (especially at
screened intervals), pumping rate and pumping schedule.
Information regarding designated wellhead. protection areas
may be obtained by contacting the Public Water Supply
Section at [phone];
• Discuss the uses and activities (involving possible human
exposure to contamination) that could occur at the site and
adjacent properties. Examples of such activities and uses
include but are not limited to use of a property for an office,
manufacturing operation, residence, store, school, gardening
or farming activities, recreational activities, or undeveloped
land;
• Determine whether the contaminated area is located in an
area where there is recharge to an unconfined or
semi -confined deeper aquifer that is being used or may be
used as a source of drinking water. Based on a review of
scientific literature on the regional hydrogeology and well
construction records and lithological logs for deeper wells in
the area, identify and describe the deep aquifers underlying
the source of contamination. Include information on the depth
of the deep aquifer in relation to the surficial saturated zone,
the lithology and hydraulic conductivity of the strata between
the surficial aquifer and the deeper aquifer, and the
difference in groundwater head between the surficial aquifer
and the deeper aquifer. Discuss the local and regional usage
of the deep aquifer and the draw down from major pumping
influences. Also, specify the distance from the source of
contamination to major discharge areas such as streams and
rivers. Cite all sources and references used for this
discussion.
NOTE: This requirement (last bullet) only pertains to
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August 12, 2014
contamination sources in the Coastal Plain physiographic region
as designated on a map entitled "Geology of !North Carolina"
published by the Department in 1985. However,
recharge/discharge, hydraulic conductivity, lithology, head
difference, etc. is also important information at mountains
and piedmont sites.
F. Regional Geology and Hydrogeology
Provide a brief description of the regional geology and hydrogeology. Cite
all references.
G. Site Geology and Hydrogeology
• Describe the soil and geology encountered at the site. Use
the information obtained during assessment activities (e.g.,
lithological descriptions made during drilling, probe surveys,
etc.). This information should correspond to the geologic
cross sections required in N. below; and
• Based on the results of the groundwater investigation,
describe the site hydrogeology, including a discussion of
groundwater flow direction, hydraulic gradient, hydraulic
conductivity and groundwater velocity. Discuss the effects of
the geologic and hydrogeological characteristics on the
migration, retardation, and attenuation of contaminants.
H . Soil Sampling Results
Using figures and tables to the extent possible, describe all soil sampling
performed to date and provide the rationale for sample locations, number
of samples collected, etc. Include the following information:
• Location of soil samples;
• Date of sampling;
• Type of soil samples (from excavation, borehole, Geoprobe,
etc.);
• Soil sample collection procedures (split spoon, grab, hand
auger, etc.)
• Depth of soil samples below land surface;
• Soil sample identification
• Soil sample analyses;
• Soil sample analytical results (list any contaminant detected
above the method detection limit); and
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August 12, 2014
• Identify any sample analytical results that exceed the
applicable cleanup levels.
NOTE: Information related to H. above should correspond to the
sampling location and sampling results maps required in N. below.
I . Groundwater Sampling Results
Using figures and tables to the extent possible describe the groundwater
sampling performed to date and provide the rationale for sample locations
(based on source and contaminant type), number of samples collected,
etc. Include the following information:
• Location of groundwater samples and monitoring wells;
• Date of sampling;
• Groundwater sample collection procedures (bailer, pump,
etc.);
• Groundwater sample identification and whether samples
were collected during initial abatement, CSA, etc.;
• Groundwater sample analyses;
• Groundwater sample analytical results (list any contaminant
detected above the method detection limit; and
• Identify all sample analytical results that exceed 15A NCAC
2L or interim standards.
NOTE: Information related to 1. above should correspond to the
sampling location and sampling results maps required in N. below.
J. Hydrogeological Investigation
Describe the hydrogeological investigation performed including all
methods, procedures and calculations used to characterize site
hydrogeological conditions. The following information should be discussed
and should correspond to the maps and figures required below:
• Groundwater flow direction;
• Hydraulic gradient (horizontal and vertical);
• Hydraulic conductivity;
• Groundwater velocity;
• Contaminant velocity;
• Slug test results; *
• Aquifer test results;
• Plume's physical and chemical characterization; and
• Fracture trace study if groundwater in bedrock is impacted.
6

August 12, 2014
* Check with the Regional Office prior to performing these tests
and study to see if necessary for the site.
K. Groundwater Modeling Results
Groundwater modeling or predictive calculations may be necessary at
some sites (source area proximate to surface water, source area located
within wellhead protection area or source area overlying semi -confined or
unconfined deeper Coastal Plain aquifer) to verify, based on site specific
hydrogeological conditions, whether groundwater contamination poses a
risk to receptors. For contamination shown to pose a risk to receptors,
groundwater modeling may be necessary to determine an appropriate
cleanup level for contaminated groundwater. Modeling should illustrate the
input data used to complete the model and will generally be required for
natural attenuation proposals (see Groundwater Modeling Policy at
http://portal. ncdenr.org/web/wq/aps/a-wr)ro/policy).
NOTE: Input data for models should be derived from site specific
information with limited assumptions or estimates. All assumptions and
estimated values including biodegradation rates must be conservative
(predict reasonable worst -case scenarios) and must be well documented.
L. Discussion
• Nature and extent of contamination, including primary and
secondary source areas, and impacted groundwater and
surface water resources;
• Maximum contaminant concentrations;
• Contaminant migration and potentially affected receptors
M. Conclusions and Recommendations
If corrective action will be necessary, provide a preliminary evaluation of
remediation alternatives appropriate for the site. Discuss the remediation
alternatives likely to be selected. Note that for impacts to groundwater
associated with permitted activities, corrective action pursuant to 15A
NCAC 2L .0106(k), (1) and (m) is not applicable, unless provided for
pursuant to 15A NCAC 2L .0106(c) and (e) or through a variance from the
Environmental Management Commission (EMC).
N. Figures
9 71/2 minute USGS topographic quadrangle map showing an area

August 12, 2014
within a minimum of a 1,500-foot radius of the source of
contamination and depicting the site location, all water supply wells,
public water supplies, surface water intakes, surface water bodies,
designated well head protection areas, and areas of recharge to
deeper aquifers in the Coastal Plain that are or may be used as a
source for drinking water;
Site map locating source areas, site boundaries, buildings, all water
supply wells within a minimum of 1,500 feet, named
roads/easements/right-of-ways, subsurface utilities, product or
chemical storage areas, basements and adjacent properties, scale
and north arrow;
At least two geologic cross sections through the saturated and
unsaturated zones intersecting at or near right angles through the
contaminated area using a reasonable vertical exaggeration.
Indicate monitoring well/sample boring/sample locations and
analytical results for soil samples. Identify the depth to the water
table. Provide a site plan showing the locations of the cross
sections;
■ Site map(s) showing the results of all soil sampling conducted.
Indicate sampling identifications, sampling depths, locations and
analytical results;
■ Site map(s) showing the results of all groundwater sampling
conducted. Indicate sampling locations, monitoring well
identifications, sample identifications, and analytical results;
Separate groundwater contaminant iso-concentration contour maps
showing total volatile organic compound concentrations, total
semi -volatile organic compound concentrations and concentrations
for the most extensive contaminant. Maps should depict the
horizontal and vertical extent. Contour line for applicable 2L
standard should be shown in bold;
■ Site map(s) showing the elevation of groundwater in the monitoring
wells and the direction of groundwater flow. Contour the
groundwater elevations. Identify and locate the datum (arbitrary
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August 12, 2014
1000, USGS, NGVD) or benchmark. Indicate the dates that water
level measurements were made. There should be one map for each
series of water level measurements obtained;
■ Groundwater contaminant iso-concentration contour cross-section;
and
■ Site map(s) showing the monitoring wells.
NDTE: If possible, use a single base map to prepare site maps using a
map scale of 9 inch = 40 feet (or a smaller scale for large sites, if
necessary). Maps and figures should include conventional symbols,
notations, labeling, legends, scales, and north arrows and should
conform to generally accepted practices of map presentation such as
those enumerated in the US Geological Survey pamphlet, "Topographic
Maps".
O. Tables
List all water supply wells, public or private, including irrigation wells
and unused wells, (omit those that have been properly abandoned
in accordance with 15A NCAC 2C .0100) within a minimum of 1500
feet of the known extent of contamination For each well, include the
well number (may use the tax map number), well owner and user
names, addresses and telephone numbers, use of the well, well
depth, well casing depth, well screen interval and distance from the
source of contamination;
List the names and addresses of property owners and occupants
within or contiguous to the area containing contamination and all
property owners and occupants within or contiguous to the area
where the contamination is expected to migrate;
■ List the results for groundwater samples collected including sample
location; date of sampling; sample collection procedures (bailer,
pump, etc.); sample identifications; sample analyses; and sample
analytical results (list any contaminant detected above the method
detection limit in bold); and
List for each monitoring well, the monitoring well identification
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August 12, 2014
numbers, date water levels were obtained, elevations of the water
levels, the land surface, top of the well casing, screened interval
and bottom of the well.
P Appendices
• Boring logs and lithological descriptions;
• Well construction records;
• Standard procedures used at site for sampling, field equipment
decontamination, field screening, etc.;
• Laboratory reports and chain -of -custody documents;
• Copies of any permits or certificates obtained, permit number,
permitting agency, and
• Modeling data and results;
• Slug/pumping test data; and
• Certification form for CSA
10

August 12, 2014
DIVISION OF WATER RESOURCES
Certification for the Submittal of a Comprehensive Site Assessment
Responsible Party and/or Permittee:
Contact Person:
Address:
City: State: Zip Code:
Site Name:
Address:
City: State: Zip Code:
Groundwater Incident Number (applicable):
I, , a Professional Engineer/Professional Geologist
(circle one) for (firm or
company of employment) do hereby certify that the information indicated below is
enclosed as part of the required Comprehensive Site Assessment (CSA) and that
to the best of my knowledge the data, assessments, conclusions,
recommendations and other associated materials are correct, complete and
accurate.
(Each item must be initialed by the certifying licensed professional)
1. The source of the contamination has been identified. A list of all
potential
sources of the contamination are attached.
2. Imminent hazards to public health and safety have been identified.
3. Potential receptors and significant exposure pathways have been
identified.
4. Geological and hydrogeological features influencing the movement
of groundwater have been identified. The chemical and physical character of the
contaminants have been identified.
5. The CSA sufficiently characterizes the cause, significance and
extent of groundwater and soil contamination such that a Corrective Action Plan
can be developed. If any of the above statements have been altered or items not
initialed, provide a detailed explanation. Failure to initial any item or to provide
written justification for the lack thereof will result in immediate return of the CSA to
the responsible party.
(Please Affix Seal and Signature)
11

Summary of Work Plan Submittals and NCDENR-Duke
Energy Correspondence

'A
NCDENR
North Carolina Department of Environment and Natural Resources
Pat McCrory
Governor
February 24, 2015
Mr. Harry Sideris
Senior Vice -President
Environment, Health, and Safety
Duke Energy
526 South Church Street
Mail Code EC3XP
Charlotte, NC 28202
Re: Buck Steam Station
NPDES Permit No. NC0004774 — Rowan County, North Carolina
Conditional Approval of Revised Groundwater Assessment Work Plan
Dear Mr. Sideris:
Donald R. van der Vaart
Secretary
On December 31, 2014, the Division of Water Resources (Division) received the revised
Groundwater Assessment Plan (GAP) for the above listed facility. The revised GAP was submitted
in response to the DWR's Review of Groundwater Assessment Work Plan letter dated November 4,
2014. A review of the plan has been completed and several deficiencies or items requiring
clarification were noted. Therefore, in order to keep the site assessment activities on a timely
schedule, the Division has approved the revised Groundwater Assessment Plan under the condition
that the following deficient items are addressed in the Groundwater Assessment Report:
• Comment Section 5.3 Hydrogeologic Site Characteristics:
Information needed to develop the initial site conceptual site model (ISCM) was available in
the revised GAP, but for the most part data were not provided in a clear, cohesive manner to
illustrate where data gaps may exist. Duke Energy should incorporate all existing data at the
site and be prepared to collect additional data if the Division determines that additional data
gaps exist. Continued site conceptual model development should follow guidelines similar to
those presented in the American Standards Testing Measures E1689 - 95(2014) Standard
Guide for Developing Conceptual Site Models for Contaminated Sites to direct data
collection, data interpretation, and model development efforts.
Information provided in "Generalized Groundwater Flow Direction Figure, Duke Energy
Carolinas, LLC, Buck Combined Cycle Station Ash Basin" letter (2014) was useful with
respect to understanding conceptual site conditions and evaluating data gaps, but was not
provided in the revised GAP. Data from this report should be used in site assessment and
comprehensive site assessment (CSA) report development. If other reports relevant to
1636 Mail Service Center, Raleigh, North Carolina 27699-1636
Phone: [phone]ntennet: http://www.ncwater.org
An Equal Opportunity 1 Affirmative Action Employer— Made in part by recycled paper

Buck Steam Station
February 24, 2015
Page 2 of 4
groundwater contamination and hydrogeologic assessment exist, they should. also be used
and documented in the CSA report.
• Comment 7.1.3 Deep Monitoring Wells
The Division suggests installing a monitoring well screened across the transition zone, or
partially weathered rock, in the vicinity of compliance groundwater monitoring well
cluster MW-9S/D to address a data gap with respect to that hydrostrafigraphic unit in this
area.
• Comment Section 7.1.4 Bedrock Monitoring Wells:
The Division suggests installing a bedrock monitoring wells in the immediate vicinity of
proposed locations AB-2S/SL/D and AB-4S/SL/D to address data gaps within the Celll
primary pond and Cell 2 primary pond, respectively. In addition, installation of bedrock
monitoring wells is suggested in the immediate vicinity of proposed well cluster locations
GWA-3S/D and GWA-6S/D to address data gaps in these areas. These locations will
provide more data for assessment of multiple flowpath transects across the site.
• Comment Section 7.2 Groundwater Sampling and Analysis:
Direction provided in the "EPA Region 1 Low Stress Purging and Sampling Procedure
for the Collection of Groundwater Samples from Monitoring Wells" (2010) should be
followed strictly and any deviations from the procedure must be approved by the
Division and documented accordingly. For example, samples should not be collected
until pH is stabilized within t 0.1 for three consecutive readings rather than t 0.2 written
in the GAP. Temperature and specific conductivity readings should stabilize within 3%
for three consecutive readings before samples are collected instead of 10% noted in the
GAP. Also note that if the pumping rate is so low that the flow-through-cell/chamber
volume cannot be replaced in a 5 minute interval, the time between measurements should
be increased accordingly
Comment Table 10 — Groundwater, Surface Water, and Seep Parameters and Constituent
Analytical Methods:
Low level Vanadium listed as having a detection limit unit of mg/L. This is likely just a
typographical error but the units should be in µg/L rather than mg/L.
• Comment Section 7.2.3 Speciation of Select Inorganics and 7.3.3 Seep Samples:
The GAP text indicates that review of the NCDENR March 2014 seep and surface water
sampling analytical data will be incorporated into assessment plans to evaluate seep and
surface water sample locations at the facility.
Locations where NCDENR's March 2014 seep and surface water sampling data indicated
exceedances or elevated concentrations of iron, manganese and other constituents of
concern (COCs) should be incorporated into the assessment's seep/surface water
sampling plans with speciation of analytical data sufficient to support delineation and
modeling efforts.
In addition to evaluation NCDENR's March 2014 data for other sampling locations and
analytical speciation, a potential area of concern was identified by NCDENR during a

Buck Steam Station
February 24, 2015
Page 3 of 4
December 5, 2014 investigation of groundwater seepages along the riverbank adjacent to
the facility. This area includes a wetland/surface water feature downgradient and
northeast of seep location S-6 in GAP Figure 3. There is a proposed sample location
designated as 4-1) in this wetland/surface water feature which was identified in the
"Topographic Map and Discharge Assessment Plan", dated December 30, 2014.
Sampling of the 4-D area and the adjacent riverbank seepages for targeting facility COCs
and speciation of selected COCs should also be included in the site assessment activities
to evaluate and support modeling of flowpaths in this area.
The current GAP proposes to speciate iron and manganese groundwater samples from a
subset of wells, and in addition, speciate chromium in select ash basin pore water
samples, groundwater samples collected from monitoring wells MW-7S, MW-13D, BG-
1S/D, and in seep/surface waters collected from S-IA, S-113 and S-IC. Additional
analytical speciation for iron, manganese, and chromium should be considered for
samples collected from locations across the site along flowpath transects. Possible
locations could include, but are not limited to, monitoring wells MW-7D, MW-I I S/D,
BG-2S/D, BG-3S/D, GWA-14S/D, MW-12S/D and other seep/surface water locations
which would support delineation and modeling efforts.
• Comment Section 7.2 Groundwater Sampling and Analysis, 7.6 Site -Specific
Background Concentrations, and Figure 3:
The present version of the GAP proposes three background location monitoring well
locations BG-1 S/D, BG-2S/D, BG-3S/D. It maybe beneficial to move the proposed
location of BG-2S/D further to the south to provide even more distance from the ash
basins.
In addition, technical direction that will serve as the basis of expectations for completion of the site
assessment is provided at Attachment 1. Failure to address the deficient items stated above will
result in Duke Energy not being in compliance with the stated statutes. Per G.S. 130A-309.209(a)
(3) and (4), you must begin implementation of the revised GAP on March 6, 2015 and the
Groundwater Assessment Report is due on August 23, 2015. It is our understanding that Duke
Energy may have to obtain additional permits to facilitate installation of certain monitoring wells. In
the event permits are needed for this purpose, Duke Energy should take all steps necessary consistent
with the law to avoid delaying completion of the assessment report.
If you have any questions, please contact Bruce Parris at [phone].
Sincerely,
el r S��
6) �
S. Jay Zimmerman, P.G.,
Acting Director Division of Water Resources

Buck Steam Station
February 24, 2015
Page 4 of 4
cc: WQROS — MRO
WQROS Central Files
DENR Secretary - Don van der Vaart
HDR (Attn: William Miller) 440 South Church Street, Suite 1000, Charlotte, NC 28202

Attachment 1
Page 1 of 6
Duke Energy GAP Review Issues
The items identified in this Groundwater Assessment Plan (GAP) review summary are provided for
general discussion for the various parties to agree upon technical direction and content in the revised
GAPs, comprehensive site assessments (CSAs), and corrective action plans (CAPS).
Groundwater Monitoring
1. A schedule for continued groundwater monitoring is mandated by the Coal Ash Management
Act 2014. An interim plan should include at least two rounds of groundwater samples collected
and analyzed in 2015. The analytical results of the first round of data collected in 2015 would be
included in the CSA report, while the results of the second round would be submitted as a CSA
addendum. After CSA data can be evaluated, a plan for continued groundwater monitoring can
be developed for implementation in 2016.
2. Sites impacted by inorganics are typically managed using a tiered site analysis which includes
four elements as referenced in EPA/600/R-07/139:
• Demonstration of active contaminant removal from groundwater & dissolved plume
stability;
• Determination of the mechanism and rate of attenuation;
• Determination of the long-term capacity for attenuation and stability of immobilized
contaminants, before, during, and after any proposed remedial activities; and
• Design of performance monitoring program, including defining triggers for assessing
the remedial action strategy failure, and establishing a contingency plan.
This reference and the framework described above should be used as applicable to meet
the corrective action requirements found in 15A NCAC 02L .0106.
3. Because of uncertainty concerning the site's ability to attenuate contaminants over the long
term given potentially changing geochemical conditions, there is a need to address the elements
of the tiered site analysis described above and collect appropriate samples as part of the CSA,
CAP development, and continued groundwater monitoring.
4. The Division of Water Resources (Division) Director is responsible for establishing background
levels for COPCs in groundwater. This determination is based on information and data provided
by the responsible party and may include formal statistical testing using background wells with
at least four rounds of data. Wells identified as "background" are subject to periodic review
based on a refined understanding of site chemistry and hydrogeologic conditions. In general,
each facility must have a background well or wells screened or open to each of the dominant
flow systems that occur at the site and are associated with groundwater contamination. Any
questions concerning adequacy of background monitoring locations or conditions at the
facilities should be directed to the Regional offices.

Attachment 1
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S. Delineation of the groundwater contaminant plume associated with coal combustion residuals is
a requirement of the investigation and if off -site monitoring wells are ultimately required to
perform this task, then it is expected that these activities will be completed as part of the
groundwater assessment activities and included in the final report. Documentation of the effort
to gain off -site access, or right of way permits, will be provided if off -site access is denied or
alternate means of assessing the area were not available within the allocated timeframe (such
as within right-of-ways).
Site Assessment
Data Requirements and Sampling Strategy
1. Robust data collection is warranted to support timely completion of site assessments and
subsequent corrective action plans because of the impending deadlines for completion of CSAs
and CAPs, scale and geologic complexity of the sites, the challenges of modeling heterogeneous
systems, and site proximity to potential human and sensitive ecosystem receptors.
2. Robust data collection will be focused along strategically positioned flowpath transect(s) - from
ash pond source to potential receptor —as an efficient approach for model development
(analytical, geochemical, groundwater flow, and transport) in support of risk assessment and
CAP development. Data collected to support evaluation of site conditions along the flowpath
transects should be located along or defensibly proximate to the modeled transects.
3. The dataset developed along proposed flowpath transects will include any information needed
to determine constituent concentrations, conduct Kd tests, and perform batch geochemical
modeling in multiple flow horizons as appropriate. This data will include a) solid phase sample
collection for Kd measurement and batch geochemical modeling, inorganic analysis and
speciation, and other parameters identified in General Comment #4 of the November 4, 2014
GAP comments issued by DWR, b) solution phase sample collection for total and dissolved
inorganic analysis of total concentrations, small pore filtration for dissolved samples, etc., and c)
slug, constant/falling head, and packer testing. The solid phase sample mineralogy, total
concentration results, re-dox measurements, and other geochemical parameters will be used as
input for equilibrium speciation calculations of redox sensitive constituents calculated by
PHREEQC or similar program (EPA/540/5-92/018). This geochemical modeling will be performed
to identify potential mineral phases, estimated species speciation and concentrations, and will
be performed varying key solubility controlling parameters to predict mineral phases,
speciation, and concentrations under varying conditions. Solid samples for Kd tests from
locations where moderately to strongly reducing conditions are anticipated shall be frozen upon
collection and tested in glove box conditions (EPA/600/R-06/112). Refer to EPA/600/R-07/139
Section III for the data collection and characterization needed to support the four -tiered analysis
discussed above.
4. Speciations for groundwater and surface water samples should include Fe, Mn, and any COPCs
whose speciation state may affect toxicity or mobility (e.g. As, Cr, Se, or others if applicable).
This speciation will apply for groundwater samples collected at wells located along proposed

Attachment 1
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flowpath transects and in wells where these constituents exceed 2L groundwater standards as
well as for surface water samples collected within ash impoundments.
S. Solid phase samples shall be analyzed for: minerals present, chemical composition of oxides,
hydrous Fe, Mn, and AL oxides content; moisture content; particle size analysis; plasticity;
specific gravity; porosity; permeability, or other physical properties or analyses needed to
provide input to a chosen model. The Division reserves the right to request analysis for organic
carbon content, organic carbonate content (as appropriate if site conditions warrant), or ion
exchange capacities, if needed to complete the site assessment process.
6. In addition to conducting the SPLP leachable inorganic compounds analysis for selected ash
samples to evaluate the potential for leaching of constituents to groundwater, the leachable
analysis should also be conducted for some soil samples from locations beneath the ash ponds,
within the plume, and outside the plume to evaluate potential contributions from native soils.
7. In addition to collecting solid phase samples onsite for Kd procedures, soil samples should be
also collected from unaffected soils within groundwater flow pathway to evaluate Kd(s) or
hydrous ferrous oxide.
8. Rock samples for laboratory analyses should be collected as commented in General Comment 4
of the November 4, 2014 GAP comments issued by DWR. This GAP review comment indicated
that the sample(s) collected from bedrock well soil and rock cores shall be analyzed, at a
minimum, for the following: type of material, formation from which it came, minerals present,
chemical composition as oxides, hydrous Fe, Mn, and Al oxides content, surface area, moisture
content, etc.; however, these analyses were not mentioned in the GAP. The Division reserves
the right to request analysis for organic carbon content, organic carbonate content, and ion
exchange capacity if needed to complete the site assessment process.
9. The coal ash and soil analyte lists should match the groundwater analyte lists.
10. Total uranium analysis should be analyzed where total radium is analyzed for groundwater.
11. If analytical results from a seep sample exceed 2L standards, then the area in the vicinity of the
sample location should be investigated for groundwater contamination. If analytical results
from a surface water sample exceed 2B standards, then the area in the vicinity of the sample
location should be investigated for groundwater contamination.
12. Surface water/seep samples should be collected during baseflow conditions and that the
groundwater monitoring (water levels and sampling) should occur at about the same time.
13. Measurement of streamflow in selected perennial streams is expected as needed in support of
simulation/calibration of flow and transport models; major rivers that serve as groundwater
divides are not included in this expectation.
Conceptual Model Elements
1. In the CSA report, data gaps remaining should be specifically identified and summarized.
2. Site heterogeneities should be identified and described with respect to: a) their nature, b)
their scale and density, c) the extent to which the data collection successfully characterizes
them, d) how the modeling accounts for them, e) and how they affect modeling uncertainty.

Attachment 1
Page 4 of 6
3. The impact of data gaps and site heterogeneities should be described in relation to the
elements developed in the Site Hydrogeologic Conceptual Model and Fate and Transport
Model subsections.
4. For sites in the Piedmont or Mountains, the CSA Report should include a subsection within the
Site Geology and Hydrogeology Section titled 'Structural Geology'. This section should
describe: a) foliations, b) shear zones, c) fracture trace analysis, and d) other structural
components anticipated to be relevant to flow and contaminant transport at the site.
5. Duke Energy will include a poster -sized sheet(s) (ANSI E) combining tabulated analytical
assessment results (groundwater, surface water, and leachate samples); multiple sheets may
be needed to present the data. This should be provided in addition to the individual analytical
results tables that will be prepared for the CSA reports. Any questions concerning format or
content of the analytical result summaries should be directed to the Regional offices.
Geochemical Modeling
1. The Division agrees that a geochemical model "coupled" to a 3-D fate and transport model is
inappropriate given the size and complexity of the sites and the extremely large amount of data
required to calibrate such a model. Rather, a "batch" geochemical model approach should be
sufficient for successfully completing the site assessment and/or corrective action plan.
2. Samples collected for "batch" geochemical analysis should be focused along or defensibly
proximate to flowpath transects.
3. To support successful batch geochemical modeling, dissolved groundwater samples collected
along a contaminant flowpath transect should be obtained using a 0.1 um filter. This will help
ensure a true dissolved phase sample. Note that the dissolved samples are for assessment
purposes only and may not be used for purposes of compliance monitoring. If there is
uncertainty about which areas/wells will be used in the batch geochemical modeling, the initial
round of assessment sampling at the facility can utilize the 0.45 um filter until the contaminant
flow path transects are selected. Once determined, Duke Energy can go back and re -sample the
wells needed for geochemical modeling using the 0.1 um filter. It is recognized that the use of a
0.1 um filter will be difficult for wells with elevated turbidity; in this case, it is recommended
that Duke Energy use two filters in series (the water initially passes through a 0.45 um filter to
remove larger particles prior to passing through the 0.1 um filter). Information for a disposable
0.1um field filter designed specifically for sampling groundwater for metal analysis is provided at
the following link: http://www.vosstech.com/index.php/products/filters. If field comparisons of
0.1 versus 0.45 micron filtration at several transect wells at a given site show no significant
differences between the two methods, then 0.45 micron filters may be used for evaluating the
dissolved phase concentrations at that site.
4. In support of the objectives of General Comment #2 of the November 4, 2014 GAP comments
issued by DWR, Duke Energy should add a column titled 'relative redox' to the analytical results
tables to record the geochemical conditions for that location/sample date. The redox
determination should be based on observed DO, ORP, and any other relevant measures and
presented for historic and new samples (wells, ash pore water, surface waters, etc.). Relative

Attachment 1
Page 5 of 6
redox designations may include "iron reducing", "sulfate reducing', mildly oxidizing, moderately
oxidizing, etc. and should be footnoted with a statement about the degree of confidence in the
designation based on amount and quality of available data.
5. Duke Energy shall also evaluate: a) spatial geochemical trends across the facility and along
selected flow paths, b) temporal geochemical trends where observable (such as for compliance
boundary wells), along with the likely reason for the change (e.g. increase in seasonal recharge,
pond de -watering and subsequent reversal of groundwater flow direction, inundation of well
from river at flood stage, etc.) in support of the CAP. This evaluation step will require a
comparison of geochemical conditions over time with rainfall data, notable ash capping,
dewatering, disposal/removal, or other plant operations, etc. The quality of existing
geochemical data will be evaluated using field notes, calibration records, and consistency in
redox measurements (e.g. eH vs. raw ORP).
Groundwater Models
1. The technical direction for developing the fate and transport modeling will follow guidelines
found in Groundwater Modeling Policy, NCDENR DWCt, May 31, 2007, and discussions
conducted between Duke Energy and their consultants with the Division. Ultimate direction for
completion of fate and transport models will be provided by the Division.
2. The CAP Report should include a subsection within Groundwater Modeling Results titled 'Site
Conceptual Model' that succinctly summarizes, for purposes of model construction, the
understanding of the physical and chemical setting of the site and shall include, at a
minimum: a) the site setting (hydrogeology, dominant flow zones, heterogeneities, areas of
pronounced vertical head gradients, areas of recharge and discharge, spatial distribution of
geochemical conditions across the site, and other factors as appropriate), b) source areas and
estimated mass loading history, c) receptors, d) chemical behavior of COPCs, and f) likely
retention mechanisms for COPCs and how the mechanisms are expected to respond to changes
in geochemical conditions.
3. Modeling will be included in the Corrective Action Plan (CAP). The four -tiered analysis
previously referenced and appropriate modeling should be conducted, and the mass flux
calculations described in the EPA/600/R-07/139 should be performed.
4. The CAP Report shall provide separate subsections for reporting groundwater flow models and
fate and transport models.
5. The CAP Report should include subsections within Groundwater Modeling Results titled
'Groundwater Model Development' that describes, for each chosen model: a) purpose of model,
built-in assumptions, model extent, grid, layers, boundary conditions, initial conditions, and
others as listed in Division guidance. Include in this section a discussion of heterogeneities and
how the model(s) account for this (e.g. dual porosity modeling, equivalent porous media
approach, etc.). Separate subsections should be developed for the groundwater flow model,
fate and transport model, and batch geochemical models, respectively.
6. CAP Reports should include a subsection within Groundwater Modeling Results titled
'Groundwater Model Calibration' that describes, for each model used, the process used to

Attachment 1
Page 6 of 6
calibrate the model, the zones of input and calibration variables (for example, hydraulic
conductivities) that were used, the actual (measured) versus modeled results for all key
variables, and others. Separate subsections should be developed for the groundwater flow
model, fate and transport model, and batch geochemical model(s), respectively.
7. CAP Reports should include a subsection within Groundwater Modeling Results titled
'Groundwater Model Sensitivity Analysis' that describes, for each model used, the process used
to evaluate model uncertainty, variable ranges tested, and the key sensitivities. Separate
subsections should be developed for the groundwater flow model, fate and transport model,
and batch geochemical model(s), respectively.
Development of Kd Terms
1. Kd testing and modeling in support of CAP development should include all COPCs found above
the NCAC 15A 02L .0106(g) standards in ash leachate, ash pore water, or compliance boundary
well groundwater samples.
2. The selected Kd used in transport modeling often will profoundly affect the results. Duke
Energy should acknowledge this concept and document within the transport modeling section(s)
of the CAP all widely recognized limitations inherent in the estimation of the Kd term.
Risk Assessment
1. Provide references for guidance and potential sampling methodology related to conducting a
baseline ecological risk assessment or habitat assessment, if warranted.

CSA GUIDELINE ADJUSTMENTS DWR Review June 2015
Tracked Changes Version, May 14, 2015
Reviewers & Users: See Document End Note
Note to NCDENR Reviewers:
Proposed CSA Guideline Adjustments are indicated as follows:
• Proposed deletions are shown as crimson colored strike through text
• Proposed additions are shown as blue -colored text.
NCDENR Division of Water Resources Position:
Clarification of certain items in the Comprehensive Site Assessment (CSA) Guidelines submitted
on August 13, 2014 is provided by the Division of Water Resources (Division) in order to
facilitate completion of the groundwater assessments at the Duke Energy Coal Ash
Impoundments. The Division does not intend to change the CSA Guidelines, which were provided
to Duke Energy to ensure compliance with NCAC 2L standards and technical direction presented
in the Coal Act Management Act Senate Bill 729 (CAMA). If a change to the CSA Guidelines
proposed by Duke Energy leads to more clarity, the Division will consider the merit of the
proposed changes on a site -by -site basis while reviewing the CSA report document. If the
Division determines the data and related reporting are inadequate, then additional information
may be requested to complete the site assessments.
This document provides guidelines for those involved in the investigation of contaminated soil
and/or groundwater, where the source of contamination is from:
• Incidents caused by activities subject to permitting under G.S. 143-215.1.
• Incidents caused by activities subject to permitting under G.S. 87-88.
• Incidents arising from agricultural operations, including application of agricultural
chemicals, but not including unlawful discharges, spills or disposal of such
chemicals.
COMPREHENSIVE SITE ASSESSMENT (CSA)
NOTE: Regional Offices may request additional information in support of the CSA to aid in their review
and will not approve the CSA if any of the elements specified below have not been included or have not
been sufficiently addressed.
Minimum Elements of the Comprehensive Site Assessment Report:
A. Title Page
• Site name, location and Groundwater Incident number (if assigned) and Permit
Number;
• Date of report;
• Responsible Party and/or permittee, including address and phone number;
• Current property owner including address and phone number;
• Consultant/contractor information including address and phone number;
• Latitude and longitude of the facility; and
• Seal and signature of certifying P.E. or P.G., as appropriate.
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CSA GUIDELINE ADJUSTMENTS DWR Review June 2015
Tracked Changes Version, May 14, 2015
Reviewers & Users: See Document End Note
B. Executive Summary
The Executive Summary should provide a brief overview of the pertinent site information (i.e.,
provide sufficient information to acquaint the reader with the who, what, when, where, why and
how for site activities to date).
1. Source Information:
• Type of contaminants
2. Initial abatement/emergency response information.
3. Receptor Information:
• Water supply wells;
• Public water supplies (wells, surface water intakes);
• Surface water bodies;
• Wellhead protection areas;
• Deep aquifers in the Coastal Plain physiographic region;
• Subsurface structures; and
• Land use.
4. Sampling/Investigation Results:
• Nature and extent of contamination;
• Maximum contaminant concentrations;
• Site Hydrogeology.
S.
Conclusions and Recommendations.
C. Table of Contents
• First page number for each section listed.
• List of figures (all referenced by number and placed in a single section following
contents text).
• List of tables (all referenced by number and placed in a single section following
contents text).
• List of appendices.
D. Site History and Source Characterization
• Provide a history of property ownership and use. Indicate dates of ownership, uses
of the site, and potential sources of contaminants.
• Discuss the source(s) of contamination, including primary and secondary sources.
• For permitted activities, describe nature of activity, permitted waste, application of
all instances of over-application/irrigation of wastes or water
• Summarize assessment activities and corrective actions performed to date including
emergency response, initial abatement, primary and secondary source removal.
Page 2 of 15

CSA GUIDELINE ADJUSTMENTS
DWR Review June 2015
Tracked Changes Version, May 14, 2015
Reviewers & Users: See Document End Note
Discuss geographical setting and present/future surrounding land uses.
E. Receptor Information
Note to NCDENR Reviewers:
With respect, the language as -is versus as -proposed of Section E did not lend itself well to "internal"
editing. Respectfully again, please receive/review as presented, with the languages at least in close
proximity, to hopefully help facilitate your review. L. Armstrong
FoF each well, include well nun4beF, weil owner and useF narnes, addFesses and
telephone nuniber-s, use of the well, well depth, well casing depth, weil scFeen
interval, sta P Ee-fyA-PA seurrEeavf eeirtamination;
AO
Page 3 of 15

CSA GUIDELINE ADJUSTMENTS DWR Review June 2015
Tracked Changes Version, May 14, 2015
Reviewers & Users: See Document End Note
activities,• Di-se-u-s-s the u-se-S -and -activities (involving possible human expesuFe to
C-AptAmipAtien) that eauld- eeeur _At the Site and- adjaeent pFeper-ties. Examples of
h activities and uses include but aFe not limited to use of a pFeper-ty for an office,
ve-Atien-al _Ae.ivities, or- undeveloped land;
the stFata between the sur-ficial aquifeF and the deeper- aquifeF, and the diffeFenee
gFE)undwater head thP_ SUFficial aquifer -And the deepeF aquifer. -Pi-seuss, t
influenees. Also, specify the distance from the sour-ee of contamination to major -
discharge areas sueh as stFeams and FiveFs. Cite all souFees and Fefer-ences used foT-
t h i S, ,l;
d�ffiFenee, etc-. is also important inoFmGtien Gt mountains 6ind piedment sites.
• Consistent with the DWR's August 13, 2014 Notice of Regulatory Requirement:
The CSA Report will include information obtained from the Drinking Water Well
and Receptor Survey Report submitted September 2014, the Supplement to
Drinking Water Supply Well and Receptor Survey Report submitted November
2014, and updated information obtained between these noted reports and
submittal of the CSA Report. The receptor survey is required by 15A NCAC 02L
.0106(g) and shall include identification of all receptors within a radius of 2,640
feet (one-half mile) from the established compliance boundary identified in the
respective National Pollutant Discharge Elimination System (NPDES) permits.
Receptors shall include, but shall not be limited to, public and private water
supply wells (including irrigation wells and unused or abandoned wells) and
surface water features within one-half mile of the facility compliance boundary.
The results of the receptor survey shall be presented on a sufficiently scaled
map. The map shall show the coal ash facility location, the facility property
boundary, the waste and compliance boundaries, and all monitoring wells listed
in the respective NPDES permits. Any identified water supply wells shall be
located on the map and shall have the well owner's name and location address
listed on a separate table that can be matched to its location on the map.
• Consistent with Senate Bill 729:
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CSA GUIDELINE ADJUSTMENTS DWR Review June 2015
Tracked Changes Version, May 14, 2015
Reviewers & Users: See Document End Note
• The CSA Report will identify all drinking water supply wells within one-half mile
down -gradient from the established compliance boundary of the impoundment
and submit the Survey to the Department. Information including well locations,
the nature of water uses, available well construction details, and information
regarding ownership of the wells will be provided for the above noted wells.
• The CSA Report will include the Duke Energy Laboratory analytical results from
the drinking water supply wells required to be sampled by the Department.
NCDENR Division of Water Resources Position:
The Division does not intend to change the CSA Guidelines. Specific information is
expected in order to evaluate site conditions at and in the vicinity of the coal ash ponds
that are germane to significant exposure pathways and potential receptors. Several of
sub -elements proposed for deletion in Section E are related to identification and
characterization of potential environmental receptors (human and ecological) and
determination of the limits of the study area or system boundaries, which are key
elements of a conceptual model as stated in standard industry practice reference ASTM
E1689 Guide for Developing Conceptual Site Models for Contaminated Sites. The Division
will evaluate the content of Section E Receptor Information along with components of the
refined conceptual site models presented in the CSA reports with respect to receptor and
exposure pathway information to determine if the data are adequate to meet CAMA
requirements for groundwater assessment and corrective action. If the Division considers
the data provided in the CSA reports are inadequate, additional data may be requested.
Data presentation -does not have to follow a prescriptive format; however,
documentation of relevant water supply well receptor information is expected by the
Division to support evaluation of potential risk to receptors and conceptual site models.
Data requirements related to Section E Receptor Information that should be considered
include:
The Division acknowledges the difficulty with determining the known extent of
contamination at this time since potential plume assessments are not complete.
With this in mind, the Division expects all drinking water wells located 2,640-feet
downgradient from the established compliance boundary be documented in the
CSA reports as specified in the CAMA requirements. The Division may request
additional data after review of well receptor and water quality data in a CSA
report.
In general, subsurface utilities are expected to be mapped within 1500-ft of the
known extent of contamination in order to evaluate the potential for preferential
pathways. An explanation must be provided in the CSA report if the subsurface
utility mapping requirements are modified. Details concerning site conditions such
the possibility of a shallow, perched, or fluctuating water table resulting from site
operations intercepting subsurface utilities must be documented. If the utility
mapping requirements are modified, Duke Energy must be able to document that
the subsurface utilities are not potential preferential pathways for contaminant
migration in the CSA reports.
Page 5 of 15

CSA GUIDELINE ADJUSTMENTS DWR Review June 2015
Tracked Changes Version, May 14, 2015
Reviewers & Users: See Document End Note
• A determination of whether the contaminated area is located in an area where
there is recharge to an unconfined or semi -confined deeper aquifer that is being
used or may be used as a source of drinking water is expected by the Division. The
groundwater assessment findings may indicate a continuous confining unit cannot
be delineated beneath across the Coastal Plain sites; therefore, potential impacts
to deeper aquifers should be evaluated.
• The Division maintains that all surface water bodies (e.g., ditch, pond, stream, lake,
river) within a minimum of 1,500 feet of the source of contamination be identified
as these features relate to identification of potential receptors and exposure
points, both key elements of a conceptual site model.
F. Regional Geology and Hydrogeology
• Provide a brief description of the regional geology and hydrogeology. Cite all
references.
G. Site Geology and Hydrogeology
• Describe the soil and geology encountered at the site. Use the information obtained
during assessment activities (e.g., lithological descriptions made during drilling,
probe surveys, etc.). This information should correspond to the geologic cross
sections required in N. below; and
• Based on the results of the groundwater investigation, describe the site
hydrogeology, including a discussion of groundwater flow direction, hydraulic
gradient, hydraulic conductivity and groundwater velocity. Discuss the effects of the
geologic and hydrogeological characteristics on the migration, retardation, and
attenuation of contaminants.
H. Soil Sampling Results
• Using figures and tables to the extent possible, describe all soil sampling performed
to date and provide the rationale for sample locations, number of samples collected,
etc. Include the following information:
• Location of soil samples;
• Date of sampling;
• Type of soil samples (from excavation, borehole, Geoprobe, etc.);
• Soil sample collection procedures (split spoon, grab, hand auger, etc.)
• Depth of soil samples below land surface;
• Soil sample identification
• Soil sample analyses;
• Soil sample analytical results (list any contaminant detected above the method
detection limit); and,
• Identify any sample analytieal Fesults that exceed the applicable eleanup levels.
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• Identify any soil sample analytical results that exceed the EPA Region 9 Regional
Screening Levels.
NOTE. Information related to H. above should correspond to the sampling location and sampling
results maps required in N. below.
NCDENR Division of Water Resources Position:
The Division does not agree with the proposal to identify soil analytical results that exceed
EPA Region 9 soil screening levels. Instead, the Division is in the process of finalizing clean
closure guidelines for cleanup that will meet protection of groundwater criteria for 2L
standards, which will include soil screening levels. Details related to the partial draft
guidelines are provided below:
Clean Closure Guidelines
The Division's goal is that facilities remediate all discharges or releases of constituents to
unrestricted use levels.
• For groundwater, the unrestricted use level is the North Carolina Division of Water
Quality, 2L groundwater standard (2L) or site -specific background concentration.
• For soil, the unrestricted use level is either the site -specific background concentration
or the lowest of a soil screening level (SSL) protective of groundwater.
Determining Soil Screening Levels for Clean Closure Soil Remediation Goals
The methodology the Division recommends for calculating unrestricted use levels or soil
screening levels (SSLs) for contaminant migration to groundwater was developed in the
Preliminary Soil Remediation Goals (PSRG) document (identified below)to identify chemical
concentrations in soil with the potential to migrate and contaminate groundwater.
• SSLs protective of groundwater are calculated with a soil leachate model using default
values from 15A NCAC 21, groundwater standard or the 2L groundwater interim maximum
allowable concentration as target groundwater concentrations and take into consideration
fate and transport parameters.
• The Preliminary Soil Remediation Goals (PSRG) table contains a column with soil
remediation goals titled (Protection of Groundwater PSRG) that should be used in
evaluating soil -to -groundwater values that meet and are protective of the 15A NCAC 2L
groundwater quality standards. A link to the IHSB PSRG table can be found here:
http://portal.ncdenr.org/c/document librarylget file?uuid=Of601ffa-574d-4479-bbb4-
253af0665bf5&groupId=38361. Please note that the Division of Waste Management
updates this table during the first and third quarter of each calendar year.
• A transport model is included in the PSRG table for calculating other soil values not
specifically listed in the table in order to meet Protection of Groundwater Criteria. Rule 15A
NCAC 2L .0202 (c) does specify substances that are not permitted in groundwater and
indicates that even those which are not specifically listed in the rule are not allowed above
the practical quantitation limit (PQL), unless they are naturally occurring. The approved
laboratory method PQL for the substance can be used in the equation if there is no
specifically listed 15A NCAC 21, standard.
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• Background concentrations of naturally occurring metals in soil at a site can be
established using EPA guidance for comparing background and chemical concentrations in
soil for CERCLA sites: httl2://www.epa.gov/oswer/riskassessment/12df/background.pdf
I. Groundwater Sampling Results
Using figures and tables to the extent possible describe the groundwater sampling performed to
date and provide the rationale for sample locations (based on source and contaminant type),
number of samples collected, etc. Include the following information:
• Location of groundwater samples and monitoring wells;
• Date of sampling;
• Groundwater sample collection procedures (bailer, pump, etc.);
• Groundwater sample identification and whether samples were collected during
initial abatement, CSA, etc.;
• Groundwater sample analyses;
• Groundwater sample analytical results (list any contaminant detected above the
method detection limit; and,
• Identify all sample analytical results that exceed 15A NCAC 2L or interim standards.
NOTE. Information related to L above should correspond to the sampling location and sampling
results maps required in N. below.
J. Hydrogeological Investigation
Describe the hydrogeological investigation performed including all methods, procedures and
calculations used to characterize site hydrogeological conditions. The following information should
be discussed and should correspond to the maps and figures required below:
• Groundwater flow direction;
• Hydraulic gradient (horizontal and vertical);
• Hydraulic conductivity;
• Groundwater velocity;
• Contaminant velocity;
• Slug test results*;
• Aquifer test results*;
• Plume's physical and chemical characterization; and
• Fracture trace study if groundwater in bedrock is impacted*.
NOTE. Check with the Regional Office prior to performing these tests and study to see if necessary
for the site.
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NOTE: Contaminant velocity will be addressed in the Groundwater Model Report portion of the
Corrective Action Plans.
NCDENR Division of Water Resources Position:
The Division agrees with the proposed change in content. Discussion of contaminant velocity is
appropriate for inclusion in the Groundwater Modeling Report portion of the Corrective Action
Plans rather than the CSAs. This is consistent with direction provided in the NCDENR
Groundwater Assessment Plan (GAP) Conditional Letters of Approval.
K. Groundwater Modeling Results
Groundwater modeling or predictive calculations may be necessary at some sites (source area
proximate to surface water, source area located within wellhead protection area or source area
overlying semi -confined or unconfined deeper Coastal Plain aquifer) to verify, based on site specific
hydrogeological conditions, whether groundwater contamination poses a risk to receptors. For
contamination shown to pose a risk to receptors, groundwater modeling may be necessary to
determine an appropriate cleanup level for contaminated groundwater. Modeling should illustrate
the input data used to complete the model and will generally be required for natural attenuation
proposals (see Groundwater Modeling Policy at
http://portal.ncdenr.org/web/wo/apskiwpro/oolicv).
NOTE: Input data for models should be derived from site specific information with limited assumptions
or estimates. All assumptions and estimated values including biodegradation rates must be conservative
(predict reasonable worst -case scenarios) and must be well documented.
NOTE: Groundwater Modeling Results will be included in the Corrective Action Plans per NCDENR
DWR Conditional Approval of Revised Groundwater Assessment Work Plan letters.
NCDENR Division of Water Resources Position:
The Division agrees with the proposed change in content. Direction has been given by the Division to
include groundwater modeling results in the Corrective Action Plans per NCDENR Conditional Approval
of Revised GAP letters. Some discussion related to how site assessment data and the resulting refined site
conceptual model will be incorporated into the groundwater models is appropriate and should be
presented in the CSAs.
L. Discussion
• Nature and extent of contamination, including primary and secondary source areas,
and impacted groundwater and surface water resources;
• Maximum contaminant concentrations; and,
• Contaminant migration and potentially affected receptors.
M. Conclusions and Recommendations
If corrective action will be necessary, provide a preliminary evaluation of remediation alternatives
appropriate for the site. Discuss the remediation alternatives likely to be selected. Note that for
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impacts to groundwater associated with permitted activities, corrective action pursuant to 15A
NCAC 2L .0106(k), (I) and (m) is not applicable, unless provided for pursuant to 15A NCAC 2L
.0106(c) and (e) or through a variance from the Environmental Management Commission (EMC).
N. Figures
Note to NCDENR Reviewers:
With respect, the language as -is versus as -proposed of Section N did not lend itself well to "internal"
editing. However, we have attempted to place language relative to certain figures (i.e., the USGS Map and
the Site Maps) at least in close proximity, to hopefully help facilitate your review. Respectfully again, we
request your receipt/review as presented.
• The CSA Report Figures will include a 71/2 minute USGS topographic quadrangle map
showing an area within a minimum of 2,640 feet (one-half mile) from the established
compliance boundary identified in the respective National Pollutant Discharge Elimination
System (NPDES) permits. This map will include depiction of the following, as applicable:
• the fossil station property boundary;
• ash basin compliance boundaries;
• 2,640 feet (one-half mile) offset of the ash basin compliance boundaries;
• water supply wells identified in the Drinking Water Well and Receptor Survey
Report submitted September 2014, the Supplement to Drinking Water Supply
Well and Receptor Survey Report submitted November 2014, and updated
information obtained between these noted reports and submittal of the CSA
Report;
• public water supplies;
• surface water intakes;
• surface water bodies;
• designated well head protection areas; and,
• areas of recharge to deeper aquifers in the Coastal Plain that are or may be used
as a source for drinking water.
within a minimum of 1,900 feet, named Feads/easements/Fight of ways, subsuFfa
utilities, pFeduet E)F chem-Jeal ster-age aFeas, basements -and adjacent • Site map leeating seuFee areas, site boundaries, buildings, all water- supply wells
leeations and analytical results for- sail samples. identify the depth to thp watiav
table. PFevide a site plan showing the locations of the eFess inteFseeting at OF near- Fight angles thFough the eopt-arnin-ated- -area usin
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-------
— -------
. . . . ... .....
..
...
The CSA Report Figures (plan views), as applicable, will be based on like or similar
base maps developed from 2014 aerial photography, with associated
photogrammetric topography. Considered collectively, the CSA Report Figures will
include the following information:
• ash basins and associated compliance boundaries;
• fossil station property boundaries within the limits of the particular map,
• buildings within the limits of the particular map;
• named roads within the limits of the particular map;
• subsurface utilities having a significant impact on groundwater flow and/or
transport from the ash basin;
• product or chemical storage areas associated with ash basin operations; and,
• scale and north arrow.
NOTE: The CSA Report will include adjacent property information obtained from the
Drinking Water Well and Receptor Survey Report submitted September 2014, the Supplement
to Drinking Water Supply Well and Receptor Survey Report submitted November 2014, and
updated information obtained between these noted reports and submittal of the CSA Report.
• soil sample locations and analytical results (subjectively as supportive of
conveying findings while affording depiction clarity);
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• groundwater sample locations and analytical results (subjectively as supportive
of conveying findings while affording depiction clarity);
• separate groundwater contaminant iso -concentration contour maps for
constituents exceeding 2L standards with contour line for applicable 2L standard
shown bold (or otherwise demarcated);
• separate groundwater elevation contour maps for each holistic series of water
level measurements obtained with:
• elevation of groundwater in the monitoring wells;
• direction of groundwater flow indicated;
• identification of the elevation datum; and,
• date(s) that the water level measurements were made.
• the monitoring wells.
• The CSA Report Figures will include at least two geologic cross sections through the
saturated and unsaturated zones intersecting at or near right angles through the ash
basin(s) as proposed in the approved Proposed Groundwater Assessment Work Plan.
The cross -sections will comprise:
• a reasonable vertical exaggeration;
• boring, monitoring well, soil sample, and/or groundwater sample locations and
analytical results (sample locations and analytical results subjectively as
supportive of conveying findings while affording depiction clarity);
• groundwater contaminant iso-concentrationcontours for constituents exceeding
2L standards;
• depiction of the water table; and,
• a site map showing the locations of the cross sections.
NCDENR Division of Water Resources Position:
The Division does not intend to change the CSA Guidelines. Proposed changes in data
presentation in Section N will be considered during the Division's review of the CSA
reports. If the Division's review of a CSA report indicates data presentation related to the
figures provided in Section N is inadequate, then additional data and/or data
presentation may be requested. Technical direction related to data presentation in
Section N that should be considered includes :
• The direction for data presentation in site assessment deliverables outlined in
Comment 23 from the November 2014 Review of Groundwater Assessment Work
Plan letters sent to Duke Energy.
Strike out the caveats that read "(subjectively as supportive of conveying findings
while affording depiction clarity)" from proposed text revisions. Direction
provided in Sections H. Soil Sampling Results and I. Groundwater Sampling
Results, respectively, gives specific instruction related to presentation of both soil
and groundwater analytical results detected above PQLs along with those results
above numeric regulatory limits. This approach is suggested in order to allow the
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Division Regional offices to have sufficient information in a format that promotes
an effective review of the CSA documents. In addition, the Division Regional
Offices may request additional information in support of the CSA to aid in their
review.
• Map groundwater analytical results related to detection monitoring constituents
and inorganic parameters as identified in the USEPA April 2015 Final Ruling 40
CFR Parts 257 and 261, including boron, calcium, chloride, conductivity, pH,
sulfate, and total dissolved solids.
Map groundwater analytical results related to assessment monitoring constituents
as identified in the USEPA April 2015 Final Ruling 40 CFR Parts 257 and 261,
including aluminum, antimony, arsenic, barium, beryllium, cadmium, chromium,
copper, iron, lead, manganese, mercury, molybdenum, selenium, sulfate, sulfide,
and thallium. In addition, map the distribution of vanadium as an assessment
monitoring constituent.
O. Tables
• List all water supply wells, public or private, including irrigation wells and unused
wells, (omit those that have been properly abandoned in accordance with 15A NCAC
2C .0100) within a minimum of 1500 feet of the known extent of contamination For-
depth,each Nye!!, inelude the %reall nu-m-h-ear- (may use the tax map numbeF), Nye!] Awnevand
user- names, add-resses and telephone numbeFs, use of the well, Nvell
contamination;casing depth, Nvell screen interval and distance 49M the SOUFGe of
List the na nn es a nd ad-d-resses of pro moo,-ty ewneFs and e ntsyAt-h;n .
ce tiguous to the area containing C0Ht_ArAin_At_jA_14 -and all pFoper-ty owners
occupants within OF COntigUOUS tO the area Nvher-e the contamination is expected t&
migr-ate; 2,640 feet (one-half mile) from the established ash basin compliance
boundaries. For each well, include that information obtained during and since the
formerly noted Receptor Surveys.
• List the results for groundwater samples collected including sample location; date of
sampling; sample collection procedures (briefly/concisely as "bailer", "pump", etc.);
sample identifications; sample analyses; and sample analytical results (4s-t
demarcate (bold or otherwise) any contaminant detected above the method
detection limit in bold); and,
• List for each monitoring well, the monitoring well identification number, date water levels
were obtained, elevations of the water levels, the land surface, top of the well casing,
screened interval and bottom of the well.
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NCDENR Division of Water Resources Position:
The Division does not intend to change the CSA Guidelines. Proposed changes in tables in Section
0 will be considered during the Division's review of the CSA reports. If the Division's review of a
CSA report indicates tables provided in Section 0 is inadequate, then revised tables may be
requested. Documentation of specific water supply well receptor information is expected to be
presented in a certain format to facilitate review and as indicated below:
Direction outlined in Comments 22 and 23, respectively, from the November 2014
Review of Groundwater Assessment Work Plan letters sent to Duke Energy for data
presentation in site assessment deliverables will be followed.
Highlight groundwater analytical results that exceed numeric regulatory values in some
manner that distinguishes those results from those below the limits. Note the numeric
regulatory value for a constituent in the table.
P. Appendices
• Boring logs and lithological descriptions;
• Well construction records;
• Standard procedures used at site for sampling, field equipment decontamination,
field screening, etc.;
• Laboratory reports and chain -of -custody documents;
• Copies of any permits or certificates obtained, permit number, permitting agency,
and
• Modeling data and results-,
• Slug/pumping test data; and
Certification fOr-M f9F GSA.
• The CSA Reports will be sealed and signed by a groundwater -experienced
Professional Engineer or Professional Geologist registered in North Carolina.
NOTE. Modeling data and results will be included in the Corrective Action Plans per NCDENR
DWR Conditional Approval of Revised Groundwater Assessment Work Plan letters.
NCDENR Division of Water Resources Position:
The Division accepts the proposed change in Section P to not include groundwater modeling
results and related data in the CSA Reports; instead, providing information related to
groundwater modeling in the Corrective Action Plans. The Division does require relevant
information provided in the Certification Form for the CSA Reports and does not accept the
proposed change for the CSA Guidelines.
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Document End Note:
This Microsoft Word file was generated from a PDF version of the August 12, 2014 Guidelines for
Comprehensive Site Assessment attached to NCDENR's August 14, 2015 Notice of Regulatory Requirements
letter. Generation comprised saving the PDF file as a Microsoft Word file using PDF Converter Assistant
within PDF Converter Enterprise 8.2, with post -conversion manual formatting. Any
discrepancy/disparity between the original PDF file and this Word file are unintentional.
Page 15 of 15

Clarification of Attachment 1 Groundwater Assessment Plan Conditional Letters of Approval Items Related to Speciation - May 22, 2015 e-mail
Duke Energy GAP Attachment Clarification Request Background:
Division of Water Resources Position
"Comment 4 of "Site Assessment: Data Requirements and Sampling Strategy" found in Attachment 1 of the GWAP
Since speciation of groundwater and surface water samples is a critical component of both the site assessments and corrective
Conditional Approval Letters states the following:
action, the Division expects a geochemical site conceptual site model (CSM) developed as a subsection in the Comprehensive
"Speciations for groundwater and surface water samples should include Fe, Mn, and any COPCs whose speciation state
Site Assessment (CSA) Reports. The geochemical CSM should provide a summary of the geochemical interactions between the
may affect toxicity or mobility (e.g. As, Cr, Se, or others if applicable). This speciation will apply for groundwater
solution and solid phases along the groundwater flowpath that impact the mobility of metal constituents. At a minimum, the
samples collected at wells located along proposed flowpath transects and in wells where these constituents exceed 2L
geochemical CSM will describe the adsorption/desorption and mineral precipitation/dissolution processes that are believed to
groundwater standards as well as for surface water samples collected within ash impoundments."
impact dissolved concentrations along the aquifer flowpaths away from the ash basin sources. The model descriptions should
After conversations with risk assessors and other technical leads with our consulting agencies, Duke Energy plans the
include the data upon which the conceptual model is based and any calculations (such as mineral saturation indices) that are
following as it relates to speciation sampling for the groundwater assessments:"
made to develop the site -specific model.
Metal speciation analyses cover a broad aspect of metals' geochemistry, including solution complexation with other dissolved
species and specific association with aquifer solids, such as a metal adsorbed onto HFO or precipitated as a sulfate mineral. A
comprehensive speciation analysis that requires a relatively complete groundwater analysis is expected that includes use of an
ion speciation computer code (such as PHREEQC) capable of calculating solution complexes, surface complexation onto HFO,
and mineral saturation indices. This type of speciation calculation is necessary for the development of a geochemical SCM and
understanding metal mobility in an aquifer.
Duke Energy Proposal
Division of Water Resources Position
For the sampling to be reported in the CSA (Round 1 of Samples)
The Division agrees with the overall approach presented for Round 1 of groundwater sampling since it is consistent with the
• At wells located along proposed flow -path transects and at surface water sample locations within the ash basins:
direction provided in Attachment 1 of the GAP Conditional Approval Letters. However as stated in the GAP Conditional Letters
o Collect samples and perform speciation for the following constituents and oxidation states: Fe(II, III), Mn(Il,lll),
of Approval, the Division reserves the right to request additional data to complete the CSA if a determination is made that
As(III,V), Cr(III,VI), Se (-II,IV,VI).
there is insufficient data to evaluate site conditions, including speciation of groundwater samples.
• At compliance wells where 2L exceedances have been measured (and are not related to turbidity):
Clarification of the Division's expectations with respect to the specific proposed direction for CSA Round 1 groundwater
o Perform speciation for the constituent with the measured exceedance if the constituent has a speciation state(s) that
sampling is provided below:
may affect toxicity or mobility.
• Existing background wells that have historically had 2L exceedances of speciation constituents and all newly installed
First bullet: Add Mn (IV) to the speciation list for wells along the flow -path transects.
background wells
o Collect samples and perform speciation for the following constituents and oxidation states: Fe(II, III), Mn(II,III),
Second bullet: The Division acknowledges that turbidity is problematic with respect to obtaining representative groundwater
As(III,V), Cr(III,VI), Se (-II,IV,VI).
samples for analysis at some wells at the coal ash facilities, particularly when the wells are completed in coal ash. However, the
Division expects that an intent to comply with the requirements of 15A NCAC 02C .0108 (p) is made:
"Each non -water supply well shall be developed such that the level of turbidity or settleable solids does not preclude accurate
chemical analyses of any fluid samples collected or adversely affect the operation of any pumps or pumping equipment."
The rules do not specify a minimum filter pack or levels of turbidity or settable solids applicable to monitoring wells; however,
proper well development must be conducted for each well such that there is no interference with subsequent sample analysis.
Any well that does not provide a water quality sample that meets the requirements of the well construction code may need to
be replaced.
Third bullet: Add Mn (IV) to the speciation list for background wells.

Duke Energy Proposal
Division of Water Resources Position
For the sampling to be reported in the Supplement to the CSA (Round 2 of Samples)
The Division agrees with the overall approach presented for Round 2 of groundwater sampling since it is consistent with the
• Any well where 2L exceedances were measured in the sampling reported in the CSA:
direction provided in Attachment 1 of the GAP Conditional Approval Letters. However as stated in the GAP Conditional Letters
o Collect samples and perform speciation for the following constituents and oxidation states: Fe(II, III), Mn(II,III),
of Approval, the Division reserves the right to request additional data to complete the CSA if a determination is made that
As(III,V), Cr(III,VI), Se (II,IV,VI) or for constituents with the measured exceedances from Round 1 if the constituent has a
there is insufficient data to evaluate site conditions, including speciation of groundwater samples.
speciation state(s) that may affect toxicity or mobility.
Clarification of the Division's expectations with respect to the specific proposed direction for CSA Round 2 groundwater
• Existing background wells that have historically had 2L exceedances of speciation constituents and all newly installed
sampling is provided below:
background wells
o Collect samples and perform speciation for constituents with the measured exceedances from Round 1 if the
First bullet: Sample wells and surface water locations situated on groundwater flow -paths as well as wells that exhibited
constituent has a speciation state(s) that may affect toxicity or mobility.
exceedances of 2L reported in the CSA. Add Mn (IV) to the speciation list for wells sampled. In addition, plan to sample a
subset of existing compliance and new site assessment wells two (2) additional times during 2015 as part of an anticipated
corrective action measure to support EPA tiered site analysis. The timeframe for these suggested additional groundwater
sample collection events should be such that the samples collected are not auto -correlated.
Second bullet: Add Mn (IV) to the speciation list for background wells. Plan to sample the existing and newly installed
background wells two (2) additional times during 2015 as part of an anticipated corrective action measure to support EPA
tiered site analysis and statistical analysis. The timeframe for these suggested additional groundwater sample collection events
should be such that the samples collected are not auto -correlated.

Revised Groundwater Assessment Work Plan

Buck Combined Cycle Station Ash Basin
Proposed Groundwater
Assessment Work Plan
(Rev. 1)
NPDES Permit NC0004774
December 30, 2014

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin z_3
Table of Contents
Table of Contents
Tableof Contents.........................................................................................................................i
ExecutiveSummary.............................................................................................................. ES-1
1.0 Introduction.......................................................................................................................... 1
2.0 Site Information.................................................................................................................... 4
2.1 Plant Description...................................................................................................... 4
2.2 Ash Basin Description............................................................................................... 4
2.3 Regulatory Requirements......................................................................................... 5
3.0 Receptor Information............................................................................................................ 7
4.0 Regional Geology and Hydrogeology................................................................................... 8
5.0 Initial Conceptual Site Model...............................................................................................10
5.1 Physical Site Characteristics....................................................................................10
5.1.1 Ash Basin.....................................................................................................11
5.1.2 Dry Ash Storage Area..................................................................................12
5.2 Source Characteristics.............................................................................................12
5.3 Hydrogeologic Site Characteristics..........................................................................14
6.0 Compliance Groundwater Monitoring..................................................................................17
7.0 Assessment Work Plan.......................................................................................................18
7.1 Subsurface Exploration............................................................................................19
7.1.1 Ash and Soil Borings....................................................................................19
7.1.2 Shallow Monitoring Wells.............................................................................22
7.1.3 Deep Monitoring Wells.................................................................................23
7.1.4 Bedrock Monitoring Wells... .......................................................................... 24
7.1.5 Well Completion and Development..............................................................24
7.1.6 Hydrogeologic Evaluation Testing................................................................25
7.2 Groundwater Sampling and Analysis.......................................................................26
7.2.1 Compliance and Voluntary Monitoring Wells................................................27
7.2.2 Onsite Water Supply Well............................................................................28
7.2.3 Speciation of Select Inorganics....................................................................28
7.3 Surface Water, Sediment, and Seep Sampling........................................................28
7.3.1 Surface Water Samples...............................................................................28
7.3.2 Sediment Samples.......................................................................................29
7.3.3 Seep Samples..............................................................................................29
7.4 Field and Sampling Quality Assurance/Quality Control Procedures .........................30

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan
��
Buck Combined Cycle Station Ash Basin
Table of Contents
7.4.1 Field Logbooks.............................................................................................30
7.4.2 Field Data Records......................................................................................30
7.4.3 Sample Identification....................................................................................30
7.4.4 Field Equipment Calibration.........................................................................31
7.4.5 Sample Custody Requirements....................................................................31
7.4.6 Quality Assurance and Quality Control Samples..........................................33
7.4.7 Decontamination Procedures.......................................................................33
7.5 Site Hydrogeologic Conceptual Model.....................................................................34
7.6 Site -Specific Background Concentrations................................................................35
7.7 Groundwater Fate and Transport Model..................................................................35
7.7.1 MODFLOW/MT3DMS Model........................................................................36
7.7.2 Development of Kd Terms............................................................................37
7.7.3 MODFLOW/MT3DMS Modeling Process.....................................................38
7.7.4 Hydrostratigraphic Layer Development........................................................40
7.7.5 Domain of Conceptual Groundwater Flow Model.........................................40
7.7.6 Boundary Conditions for Conceptual Groundwater Flow Model....................41
7.7.7 Groundwater Impacts to Surface Water.......................................................41
8.0 Risk Assessment.................................................................................................................43
8.1 Human Health Risk Assessment..............................................................................43
8.1.1 Site -Specific Risk -Based Remediation Standards........................................44
8.2 Ecological Risk Assessment....................................................................................45
9.0 CSA Report.........................................................................................................................48
10.0 Proposed Schedule...........................................................................................................50
11.0 References........................................................................................................................51
Appendix A — Notice of Regulatory Requirements Letter from John E. Skvarla, III, Secretary,
State of North Carolina, to Paul Newton, Duke Energy, dated August 13, 2014.
Appendix B — Site Plan for Modeling Cross Sections Buck Steam Station Ash Basin Duke
Energy Carolinas, LLC Rowan County, NC, Figure 4, March 10, 2014 DRAFT;
Cross Sections A -A', B-B', C-C'
Appendix C — Review of Groundwater Assessment Work Plan Letter from S. Jay Zimmerman,
Chief, Water Quality Regional Operations Section, NCDENR, To Harry Sideris,
Duke Energy, dated November 4, 2014.

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin z_3
Table of Contents
List of Figures
1. Site Location Map
2. Site Layout Map
3. Proposed Monitoring Well and Sample Location Map
List of Tables
1. Groundwater Monitoring Requirements
2. Exceedances of 2L Standards
3. SPLP Leaching Analytical Results
4. Groundwater Analytical Results
5. Soil and Ash Analytical Results
6. Surface Water Analytical Results
7. Ash Basin Pore Water Analytical Results
8. Seep Analytical Results
9. Environmental Exploration and Sampling Plan
10. Soil and Ash Parameters and Constituent Analytical Methods
11. Groundwater, Surface Water, and Seep Parameters and Constituent Analytical Methods

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
EXECUTIVE SUMMARY
Executive Summary
Duke Energy Carolinas, LLC (Duke Energy), owns and formerly operated the Buck Steam
Station (BSS), located on the Yadkin River in Rowan County near the town of Salisbury, North
Carolina (see Figure 1). BSS began operation in 1926 as a coal-fired generating station. The
Buck Combined Cycle Station (BCCS) natural gas facility was constructed at the site and began
operating in late-2011. Subsequently, the BSS was decommissioned and taken offline in
April 2013. The coal ash residue from BSS's coal combustion process was historically disposed
of in the station's ash basin located adjacent to the station and the Yadkin River. The discharge
from the ash basin is permitted by the North Carolina Department of Environment and Natural
Resources (NCDENR) Division of Water Resources (DWR) under the National Pollutant
Discharge Elimination System (NPDES) Permit NC0004774.
Duke Energy has performed voluntary groundwater monitoring around the ash basin from
November 2006 until May 2010. The voluntary groundwater monitoring wells were sampled two
times each year and the analytical results were submitted to DWR. Groundwater monitoring as
required by the NPDES permit began in March 2011. The system of compliance groundwater
monitoring wells required for the NPDES permit is sampled three times a year and the analytical
results are submitted to the DWR. The compliance groundwater monitoring is performed in
addition to the normal NPDES monitoring of the discharge flows from the ash basin.
It is Duke Energy's intention that the assessment will collect additional data to validate and
expand the knowledge of the groundwater system at the ash basin. The proposed assessment
plan will provide the basis for a data -driven approach to additional actions related to
groundwater conditions if required by the results of the assessment and for closure.
On August 13, 2014, NCDENR issued a Notice of Regulatory Requirements (NORR) letter to
Duke Energy, pursuant to Title 15A North Carolina Administrative Code Chapter (15A NCAC)
02L.0106. The NORR stipulates that for each coal -fueled plant owned, Duke Energy will
conduct a comprehensive site assessment (CSA) that includes a Groundwater Assessment
Work Plan (Work Plan) and a receptor survey. In accordance with the requirements of the
NORR, HDR completed a receptor survey to identify all receptors within a 0.5-mile radius (2,640
feet) of the BCCS ash basin compliance boundary. This receptor survey also addressed the
requirements of the General Assembly of North Carolina Session 2013 Senate Bill 729 Ratified
Bill (SB 729). Similar requirements to perform a groundwater assessment are found in SB 729,
which revised North Carolina General Statute 130A-309.209(a).
In accordance with the NORR, Duke Energy submitted a Groundwater Assessment Work Plan
(GAWP) to the NCDENR on September 25, 2014. Subsequent to their review, the NCDENR
provided comments to the GAWP in a letter dated November 4, 2014. The letter included
general comments that pertained to each of the work plans prepared for Duke Energy's 14 coal
ash sites in North Carolina, as well as comments specific to the BSS work plan and site. This
Revised GWAP has been prepared to address the general and site -specific comments made by
NCDENR in the November 4, 2014 letter.

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan ��
Buck Combined Cycle Station Ash Basin
EXECUTIVE SUMMARY
Soil and groundwater sampling will be performed to provide information pertaining to the
horizontal and vertical extent of potential soil and groundwater contamination. This will be
performed by sampling existing wells, installing and sampling approximately 22 nested
monitoring well pairs (shallow and deep), 5 deep (only) monitoring wells (located adjacent to
existing shallow wells), 4 bedrock monitoring wells, and collecting soil and ash samples. This
work will provide information on the chemical and physical characteristics of site soils and ash,
as well as the geological and hydrogeological features of the site that influence groundwater
flow and direction and transport of constituents from the ash basin and ash storage area.
Samples of ash basin surface water will be collected and used to evaluate potential impacts to
groundwater and surface water. Seep samples will be collected from locations identified in July
and August 2014 (as part of Duke Energy's NPDES permit renewal application) to evaluate
potential impacts to groundwater and surface water. In addition, surface water and sediment
samples will be collected from a stream located west of the ash basin to evaluate potential
impacts from the ash basin.
The information obtained through implementation of this Work Plan will be utilized to prepare a
CSA report in accordance with the requirements of the NORR. If it is determined that additional
investigations are required during the review of existing data or data developed from this
assessment, Duke Energy and HDR will notify the NCDENR regional office prior to initiating
additional sampling or investigations.
HDR will also perform an assessment of risks to human health and safety and to the
environment. This assessment will include the preparation of a conceptual site model
illustrating potential pathways from the source to possible receptors.
ES-2

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin FN
1.0 INTRODUCTION
1.0 Introduction
Duke Energy Carolinas, LLC (Duke Energy), owns and formerly operated the Buck Steam
Station (BSS), located on the Yadkin River in Rowan County near the town of Salisbury, North
Carolina (see Figure 1). BSS began operation in 1926 as a coal-fired generating station. The
Buck Combined Cycle Station (BCCS) natural gas facility was constructed at the site and began
operating in late-2011. Subsequently, the BSS was decommissioned and taken offline in April
2013. The coal ash residue from BSS's coal combustion process was historically disposed of in
the station's ash basin located adjacent to the station and the Yadkin River. The discharge from
the ash basin is permitted by the North Carolina Department of Environment and Natural
Resources (NCDENR) Division of Water Resources (DWR) under the National Pollutant
Discharge Elimination System (NPDES) Permit NC0004774.
Duke Energy has performed voluntary groundwater monitoring around the ash basin from
November 2006 until May 2010. The voluntary groundwater monitoring wells were sampled two
times each year and the analytical results were submitted to DWR. Groundwater monitoring as
required by the NPDES permit began in March 2011. The system of compliance groundwater
monitoring wells required for the NPDES permit is sampled three times a year and the analytical
results are submitted to the DWR. The compliance groundwater monitoring is performed in
addition to the normal NPDES monitoring of the discharge flows from the ash basin.
It is Duke Energy's intention that the assessment will collect additional data to validate and
expand the knowledge of the groundwater system at the ash basin. The proposed assessment
plan will provide the basis for a data -driven approach to additional actions related to
groundwater conditions if required by the results of the assessment and for closure.
On August 13, 2014, NCDENR issued a Notice of Regulatory Requirements (NORR) letter to
Duke Energy, pursuant to Title 15A North Carolina Administrative Code (15A NCAC) Chapter
02L.0106. The NORR stipulates that for each coal -fueled plant owned, Duke Energy will
conduct a comprehensive site assessment (CSA) that includes a Groundwater Assessment
Work Plan (Work Plan) and a receptor survey. In accordance with the requirements of the
NORR, HDR has completed a receptor survey to identify all receptors within a 0.5-mile radius
(2,640 feet) of the BCCS ash basin compliance boundary. The NORR letter is included as
Appendix A.
The Coal Ash Management Act 2014 — General Assembly of North Carolina Senate Bill 729
Ratified Bill (Session 2013) (SB 729) revised North Carolina General Statute 130A-309.209(a)
to require the following:
(a) Groundwater Assessment of Coal Combustion Residuals Surface
Impoundments. — The owner of a coal combustion residuals surface
impoundment shall conduct groundwater monitoring and assessment as provided
in this subsection. The requirements for groundwater monitoring and assessment
set out in this subsection are in addition to any other groundwater monitoring and
assessment requirements applicable to the owners of coal combustion residuals
surface impoundments.

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin FN
1.0 INTRODUCTION
(1) No later than December 31, 2014, the owner of a coal combustion
residuals surface impoundment shall submit a proposed Groundwater
Assessment Plan for the impoundment to the Department for its review
and approval. The Groundwater Assessment Plan shall, at a minimum,
provide for all of the following:
a. A description of all receptors and significant exposure pathways.
b. An assessment of the horizontal and vertical extent of soil and
groundwater contamination for all contaminants confirmed to be present
in groundwater in exceedance of groundwater quality standards.
c. A description of all significant factors affecting movement and transport
of contaminants.
d. A description of the geological and hydrogeological features influencing
the chemical and physical character of the contaminants.
e. A schedule for continued groundwater monitoring.
f. Any other information related to groundwater assessment required by
the Department.
(2) The Department shall approve the Groundwater Assessment Plan if it
determines that the Plan complies with the requirements of this
subsection and will be sufficient to protect public health, safety, and welfare;
the environment; and natural resources.
(3) No later than 10 days from approval of the Groundwater Assessment
Plan, the owner shall begin implementation of the Plan.
(4) No later than 180 days from approval of the Groundwater Assessment
Plan, the owner shall submit a Groundwater Assessment Report to the
Department. The Report shall describe all exceedances of groundwater
quality standards associated with the impoundment.
This work plan addresses the requirements of 130A-309.209(a)(1) (a) through (f) and the
requirements of the NORR.
On behalf of Duke Energy, HDR submitted to NCDENR a proposed Work Plan for the BSS site
dated September 25, 2014. Subsequently, NCDENR issued a comment letter dated November
4, 2014, containing both general comments applicable to all 14 of Duke Energy ash basin
facilities and site -specific comments for the BSS. In response to these comments, HDR has
prepared this revised Work Plan for performing the groundwater assessment as prescribed in
the NORR. If it is determined that additional investigations are required during the review of
existing data or data developed from this assessment, Duke Energy and HDR will notify the
NCDENR regional office prior to initiating additional sampling or investigations.
HDR will also perform an assessment of risks to human health and safety and to the
environment. This assessment will include the preparation of a conceptual site model
illustrating potential pathways from the source to possible receptors.
The purpose of the work plan contains a description of the activities proposed to meet the
requirements of 15A NCAC 02L .0106(g). This rule requires:
(g) The site assessment conducted pursuant to the requirements of
Paragraph (c) of this Rule, shall include:
(1) The source and cause of contamination;

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin FN
1.0 INTRODUCTION
(2) Any imminent hazards to public health and safety and actions taken
to mitigate them in accordance with Paragraph (f) of this Rule;
(3) All receptors and significant exposure pathways;
(4) The horizontal and vertical extent of soil and groundwater
contamination and all significant factors affecting contaminant
transport, and
(5) Geological and hydrogeological features influencing the movement,
chemical, and physical character of the contaminants.
The work proposed in this plan will provide the information sufficient to satisfy the requirements
of the rule. However, uncertainties may still exist due to the following factors:
The natural variations and the complex nature of the geological and hydrogeological
characteristics involved with understanding the movement, chemical, and physical
character of the contaminants;
• The size of the site; and
• The time frame mandated by the Coal Ash Management Act (CAMA). Site
assessments are most effectively performed in a multi -phase approach where data
obtained in a particular phase of the investigation can be reviewed and used to refine
the subsequent phases of investigation. The mandated 180-day time frame will prevent
this approach from being utilized.
The 180-day time frame will limit the number of sampling events that can be performed after
well installation and prior to report production. Effectively, this time frame will likely reduce the
number of sampling events within the proposed wells to a single sampling event.

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan ��
Buck Combined Cycle Station Ash Basin
2.0 SITE INFORMATION
2.0 Site Information
2.1 Plant Description
BSS is a former coal-fired electricity generating facility with a capacity of 256 megawatts located
near the town of Salisbury in Rowan County, North Carolina. As of April 2013, all of the coal-
fired units have been retired. The site is located northwest of Leonard Road; and the
surrounding area generally consists of residential properties, undeveloped land, and the Yadkin
River. Leonard Road generally runs from southwest to northeast in the vicinity of the site and is
located along a topographic divide. The topography at the site generally slopes downward from
that divide toward the Yadkin River.
The station is located on the south bank of the Yadkin River. The site now contains the new
BCCS Plant, a 620-megawatt natural gas -powered electricity generating station. The entire
BSS and BCCS site (Buck site) is approximately 640 acres in area.
2.2 Ash Basin Description
The ash basin system at the plant was used to retain and settle ash generated from coal
combustion at BSS. The ash basin system consists of three cells, the associated earthen dikes,
discharge structures, and two canals. The cells are designated as Cell 1 Additional Primary
Pond (Cell 1), Cell 2 Primary Pond (Cell 2), and Cell 3 Secondary Pond (Cell 3). The ash basin
is located to the south (Cell 1) and southeast (Cells 2 and 3) of the retired Steam Station Units 1
through 6 and the BCCS Plant. The original ash pond at BSS began operation in 1957 and was
formed by constructing a dam across a tributary of the Yadkin River. The footprint of the
original ash pond was the approximate current footprint of Cells 2 and 3. As the ash pond
capacity diminished over time, the original pond was eventually divided into two ash ponds
(Cells 2 and 3) by construction of a separate dike and raising the elevation of a portion of the
earthen dike along the Yadkin River in 1977. Cell 3 and the southern portion of Cell 2 continue
to serve as treatment units for the ash basin system, while trees and other vegetation have
naturally established in the northern portion of Cell 2. Cell 2 contains approximately 1,624,000
cubic yards (or 1,950,000 tons) of coal combustion product (CCP) material, while Cell 3
contains approximately 227,000 cubic yards (or 270,000 tons) of CCP material.
In 1982, additional storage was created by construction of Cell 1, separate from the other cells,
by building a new dike upgradient from Cell 2. Cell 1 contains approximately 2,366,000 cubic
yards (or 2,840,000 tons) of CCP material. In 2009, an area between Cell 1 and Cell 2 was
utilized for storage of dredged ash from Cell 1. This storage area covers approximately 14
acres, contains approximately 209,000 cubic yards of CCP waste, and drains into Cell 1. The
area contained within the waste boundary for Cell 1 encompasses approximately 71 acres. For
purposes of delineating the waste boundary, Cells 2 and 3 are considered a single unit, with the
area contained within this portion of the waste boundary encompassing approximately 80.7
acres. Cell 3 was developed by increasing the elevation of the earthen dike along the Yadkin
River and constructing an intermediate dike across the ash placed in Cell 2. The ash basin
waste boundary is shown on Figures 2 and 3. All three ash basin cells (Cell 1, Cell 2, Cell 3,

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan ��
Buck Combined Cycle Station Ash Basin
2.0 SITE INFORMATION
and the ash storage area adjacent to Cell 1) are captured by the existing compliance boundary
shown on Figure 2. Beyond the units described above (Cell 1, Cell 2, Cell 3 and the ash
storage area adjacent to Cell 1), no other CCP waste storage or disposal areas are known to
exist at the Buck site.
Until Cell 1 was constructed, ash generated from the coal combustion process at BSS was
sluiced (via ash discharge lines) into the northern section of Cell 2. Following construction of
Cell 1, discharge of sluiced ash into the ash basins system was rerouted from Cell 2 to the
northern section of Cell 1 (see Figure 2). Flow from Cell 1 enters Cell 2 via the Primary Cell
Discharge Tower. Flow from Cell 2 enters Cell 3 via the Old Primary Cell Discharge Structure.
Flow from Cell 3 discharges to the Yadkin River through the Secondary Cell Discharge Tower.
The approximate pond elevations for the three ash basin cells are: Cell 1 — pond elevation 705
feet; Cell 2 — pond elevation 682 feet; Cell 3 — pond elevation 674 feet. The elevation of the
Yadkin River near the site is approximately 624 feet.
During operation of the coal-fired units, the ash basin system was operated as an integral part
of the site's wastewater treatment system, receiving variable inflows from the ash removal
system and other permitted discharges. Currently, the ash basin receives variable inflows from
the station yard drain sump, stormwater flows, BSS wastewater, and BCCS wastewater.
The discharge from the ash basin is permitted by the NCDENR DWR under NPDES Permit
NC0004774. Effluent from the ash basin is discharged through the discharge tower, into a
concrete -lined channel, to the Yadkin River.
2.3 Regulatory Requirements
The NPDES program regulates wastewater discharges to surface waters to ensure that surface
water quality standards are maintained. The BSS site is permitted to discharge wastewater
under NPDES Permit NC0004774, which authorizes discharge from the ash basin to the Yadkin
River in accordance with effluent limitations, monitoring requirements, and other conditions set
forth in the permit.
The NPDES permitting program requires that permits be renewed every five years. The most
recent NPDES permit renewal for the BSS site became effective on January 1, 2012, and
expires August 31, 2016.
In addition to surface water monitoring, the NPDES permit requires groundwater monitoring.
Groundwater monitoring has been performed in accordance with the permit conditions
beginning in March 2011. NPDES Permit Condition A (11), Version 1.1, dated June 15, 2011,
lists the groundwater monitoring wells to be sampled, the parameters and constituents to be
measured and analyzed, and the requirements for sampling frequency and reporting results.
These requirements are provided in Table 1.
The compliance boundary for groundwater quality at the BCCS ash basin site is defined in
accordance with Title15A NCAC 02L .0107(a) as being established at either 500 feet from the
waste boundary or at the property boundary, whichever is closer to the waste. The location of

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
2.0 SITE INFORMATION
the ash basin compliance monitoring wells, the ash basin waste boundary, and the compliance
boundary are shown on Figures 2 and 3.
The locations for the compliance groundwater monitoring wells were approved by the NCDENR
DWR Aquifer Protection Section (APS). All compliance monitoring wells included in Table 1 are
sampled three times per year (in March, July, and November). Analytical results are submitted
to the DWR before the last day of the month following the date of sampling for all compliance
monitoring wells.
The compliance groundwater monitoring system for the ash basin consists of the following
monitoring wells: MW-6S, MW-6D, MW-7S, MW-7D, MW-8S, MW-8D, MW-9S, MW-9D, MW-
10D, MW-11 S, MW-11 D, MW-12S, MW-12D, and/or MW-13D (shown on Figures 2 and 3). All
of the compliance monitoring wells were installed in December 2010.
One or more groundwater quality standards (21L Standards) have been exceeded in
groundwater samples collected at monitoring wells MW-6S, MW-6D, MW-7S, MW-7D, MW-8S,
MW-8D, MW-9S, MW-9D, MW-1 OD, MW-11 S, MW-11 D, MW-12S, MW-12D, and/or MW-13D.
Exceedances have occurred for boron, chromium, iron, manganese, pH, sulfate, and total
dissolved solids (TDS). Table 2 presents exceedances measured from March 2011 through
July 2014.
Monitoring wells MW-6S, MW-7S, MW-8S, MW-9S, MW-11 S, and MW-12S were installed with
10-foot to 15-foot well screens placed above auger refusal to monitor the shallow aquifer within
the saprolite layer. These wells were installed to total depths ranging from 13.8 feet below
ground surface (bgs) at MW-9S to 21 feet bgs at MW-8S.
Monitoring wells MW-6D, MW-7D, MW-8D, MW-9D, MW-1 OD, MW-11 D, MW-12D, and MW-
13D were installed with 5-foot to 15-foot well screens placed in the uppermost region of the
transition zone. These wells were installed to total depths ranging from 29.2 feet bgs at MW-91D
to 108.5 feet bgs at MW-6D.
Monitoring wells MW-6S and MW-6D are located to the southeast of the Primary Cell at the
compliance boundary and are considered to represent background water quality conditions.
The other ash basin compliance monitoring wells were also installed at or near the compliance
boundary.
Note that monitoring wells MW-1 S, MW-1 D, MW-2S, MW-2D, MW-3S, MW-3D, MW-4S, MW-
4D, MW-5S, MW-5D, MW-6S, and MW-61D were installed by Duke Energy in 2006 as part of a
voluntary monitoring system. When the compliance groundwater monitoring program began,
MW-6S and MW-61D were incorporated into the compliance monitoring well system. Voluntary
monitoring wells MW-2S and MW-2D were abandoned during construction of BCCS. No
samples are currently being collected from the voluntary wells. The existing voluntary wells are
shown on Figures 2 and 3.

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
3.0 RECEPTOR INFORMATION
3.0 Receptor Information
The August 13, 2014 NORR states:
No later than October 14th, 2014 as authorized pursuant to 15A NCAC 02L
.0106(g), the DWR is requesting that Duke perform a receptor survey at each of
the subject facilities and submitted to the DWR. The receptor survey is required
by 15A NCAC 02L .0106(g) and shall include identification of all receptors within
a radius of 2,640 feet (one-half mile) from the established compliance boundary
identified in the respective National Pollutant Discharge Elimination System
(NPDES) permits. Receptors shall include, but shall not be limited to, public and
private water supply wells (including irrigation wells and unused or abandoned
wells) and surface water features within one-half mile of the facility compliance
boundary. For those facilities for which Duke has already submitted a receptor
survey, please update your submittals to ensure they meet the requirements
stated in this letter and referenced attachments and submit them with the others.
If they do not meet these requirements, you must modify and resubmit the plans.
The results of the receptor survey shall be presented on a sufficiently scaled
map. The map shall show the coal ash facility location, the facility property
boundary, the waste and compliance boundaries, and all monitoring wells listed
in the respective NPDES permits. Any identified water supply wells shall be
located on the map and shall have the well owner's name and location address
listed on a separate table that can be matched to its location on the map.
In accordance with the requirements of the NORR, HDR completed and submitted the receptor
survey to NCDENR (HDR, 2014A) in September 2014. HDR subsequently submitted to
NCDENR a supplement to the receptor survey (HDR, 2014B) in November 2014. The
supplementary information was obtained from responses to water supply well survey
questionnaires mailed to property owners within a 0.5-mile radius of the BCCS ash basin
compliance boundary requesting information on the presence of water supply wells and well
usage.
The receptor survey includes a map showing the coal ash facility location, the facility property
boundary, the waste and compliance boundaries, and all monitoring wells listed in the NPDES
permit. The identified water supply wells are located on the map, and the well owner's name
and location address are listed on a separate table that can be matched to its location on the
map.
During completion of the CSA, HDR will update the receptor information as necessary, in
general accordance with the CSA receptor survey requirements

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan ��
Buck Combined Cycle Station Ash Basin
4.0 REGIONAL GEOLOGY AND HYDROGEOLOGY
4.0 Regional Geology and Hydrogeology
North Carolina is divided into distinct regions by portions of three physiographic provinces: the
Atlantic Coastal Plain, Piedmont, and Blue Ridge (Fenneman, 1938). The Buck site is located
in the Charlotte terrane within the Piedmont province. The Piedmont province is bounded to the
east and southeast by the Atlantic Coastal Plain and to the west by the escarpment of the Blue
Ridge Mountains, covering a distance of 150 to 225 miles (LeGrand, 2004).
The topography of the Piedmont region is characterized by low, rounded hills and long, rolling,
northeast -southwest trending ridges (Heath, 1984). Stream valley to ridge relief in most areas
ranges from 75 to 200 feet. Along the Coastal Plain boundary, the Piedmont region rises from
an elevation of 300 feet above mean sea level, to the base of the Blue Ridge Mountains at an
elevation of 1,500 feet (LeGrand, 2004).
The Charlotte terrane consists primarily of igneous and metamorphic bedrock. The fractured
bedrock is overlain by a mantle of unconsolidated material known as regolith. The regolith
includes residual soil and saprolite zones and, where present, alluvium. Saprolite, the product
of chemical weathering of the underlying bedrock, is typically composed of clay and coarser
granular material and reflects the texture and structure of the rock from which it was formed.
The weathering products of granitic rocks are quartz -rich and sandy textured. Rocks poor in
quartz and rich in feldspar and ferro-magnesium minerals form a more clayey saprolite.
The groundwater system in the Piedmont Province, in most cases, is comprised of two
interconnected layers, or mediums: 1) residual soil/saprolite and weathered fractured rock
(regolith) overlying 2) fractured crystalline bedrock (Heath 1980; Harned and Daniel 1992). The
regolith layer is a thoroughly weathered and structureless residual soil that occurs near the
ground surface with the degree of weathering decreasing with depth. The residual soil grades
into saprolite, a coarser grained material that retains the structure of the parent bedrock.
Beneath the saprolite, partially weathered/fractured bedrock occurs with depth until sound
bedrock is encountered. This mantle of residual soil, saprolite, and weathered/fractured rock is
a hydrogeologic unit that covers and crosses various types of rock (LeGrand 1988). This layer
serves as the principal storage reservoir and provides an intergranular medium through which
the recharge and discharge of water from the underlying fractured rock occurs. Within the
fractured crystalline bedrock layer, the fractures control both the hydraulic conductivity and
storage capacity of the rock mass. A transition zone at the base of the regolith has been
interpreted to be present in many areas of the Piedmont. The zone consists of partially
weathered/fractured bedrock and lesser amounts of saprolite that grades into bedrock and has
been described as "being the most permeable part of the system, even slightly more permeable
than the soil zone" (Harned and Daniel 1992). The zone thins and thickens within short
distances and its boundaries may be difficult to distinguish. It has been suggested that the zone
may serve as a conduit of rapid flow and transmission of contaminated water (Harned and
Daniel 1992).
The igneous and metamorphic bedrock in the Piedmont consist of interlocking crystals and
primary porosity is very low, generally less than three percent. Secondary porosity of crystalline
8

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan ��
Buck Combined Cycle Station Ash Basin
4.0 REGIONAL GEOLOGY AND HYDROGEOLOGY
bedrock due to weathering and fractures ranges from one to ten percent (Freeze and Cherry,
1979) but, porosity values of from one to three percent are more typical (Daniel and Sharpless
1983). Daniel (1990) reported that the porosity of the regolith ranges from 35 to 55 percent near
land surface but decreases with depth as the degree of weathering decreases.
LeGrand's (1988; 1989) conceptual model of the groundwater setting in the Piedmont
incorporates the above two medium system into an entity that is useful for the description of
groundwater conditions. That entity is the surface drainage basin that contains a perennial
stream (LeGrand 1988). Each basin is similar to adjacent basins and the conditions are
generally repetitive from basin to basin. Within a basin, movement of groundwater is generally
restricted to the area extending from the drainage divides to a perennial stream (Slope -Aquifer
System; LeGrand 1988; 1989). Rarely does groundwater move beneath a perennial stream to
another more distant stream or across drainage divides (LeGrand 1989). The crests of the
water table undulations represent natural groundwater divides within a slope -aquifer system and
may limit the area of influence of wells or contaminant plumes located within their boundaries.
The concave topographic areas between the topographic divides may be considered as flow
compartments that are open-ended down slope.
Therefore, in most cases in the Piedmont, the groundwater system is a two medium system
(LeGrand 1988) restricted to the local drainage basin. The groundwater occurs in a system
composed of two interconnected layers: residual soil/saprolite and weathered rock overlying
fractured crystalline rock separated by the transition zone. Typically, the residual soil/saprolite
is partially saturated and the water table fluctuates within it. Water movement is generally
through the weathered/fractured and fractured bedrock. The near -surface fractured crystalline
rocks can form extensive aquifers. The character of such aquifers results from the combined
effects of the rock type, fracture system, topography, and weathering. Topography exerts an
influence on both weathering and the opening of fractures, while the weathering of the
crystalline rock modifies both transmissive and storage characteristics.
Groundwater flow paths in the Piedmont are almost invariably restricted to the zone underlying
the topographic slope extending from a topographic divide to an adjacent stream. Under natural
conditions, the general direction of groundwater flow can be approximated from the surface
topography (LeGrand 2004).
Groundwater recharge in the Piedmont is derived entirely from infiltration of local precipitation.
Groundwater recharge occurs in areas of higher topography (i.e., hilltops) and groundwater
discharge occurs in lowland areas bordering surface water bodies, marshes, and floodplains
(LeGrand 2004). Average annual precipitation in the Piedmont ranges from 42 inches to 46
inches. Mean annual recharge in the Piedmont ranges from 4.0 to 9.7 inches per year (Daniel
2001).
9

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan ��
Buck Combined Cycle Station Ash Basin
5.0 INITIAL CONCEPTUAL SITE MODEL
5.0 Initial Conceptual Site Model
The following Initial Conceptual Site Model (ICSM) has been developed for the Buck site using
available regional data and site -specific data (e.g., boring logs, well construction records, etc.).
Although the groundwater flow system at the site is not fully understood and heterogeneities
exist, the available data indicates that the LeGrand Slope -Aquifer hydrogeologic conceptual
model for sites within the Piedmont, as described in Section 4.0, is a reasonable preliminary
representation of site conditions. The ICSM served as the foundation for the development of
proposed field activities and data collection presented in Section 7.0. The ICSM will be refined
as needed as additional site -specific information is obtained during the site assessment
process.
The ICSM serves as the basis for understanding the hydrogeologic characteristics of the site, as
well as the characteristics of the ash sources, and will serve as the basis for the Site Conceptual
Model (SCM) discussed in Section 7.5.
In general, the ICSM identified the need for the following additional information concerning the
site and ash:
• Delineation of the extent of possible soil and groundwater contamination;
• Additional information concerning the direction and velocity of groundwater flow;
• Information on the constituents and concentrations found in the site ash;
• Properties of site materials influencing fate and transport of constituents found in ash;
and
• Information on possible impacts to seeps and surface water from the constituents found
in the ash.
The assessment work plan found in Section 7.0 was developed in order to collect and to
perform the analyses to provide this information. Locations of site features described below are
provided in Figure 2.
5.1 Physical Site Characteristics
The original ash pond at the Buck site began operation in 1957 and was formed by constructing
a dam across a tributary of the Yadkin River. The footprint of the original ash pond was the
approximate current footprint of Cells 2 and 3. As the ash pond capacity diminished over time,
the original pond was divided into two ash ponds (Cells 2 and 3) in 1977 by construction of a an
intermediate dike over ash, raising the western half of the original dam by approximately 10 feet.
In 1982, additional storage was created by construction of Cell 1, separate from the other cells,
by building a new dike upgradient and to the west of Cell 2.
Topography at the Buck site ranges from an approximate high elevation of 740 feet near the
southwest edge of the property near Dukeville Road to an approximate low elevation of 620 feet
at the interface with the Yadkin River on the northern extent of the site. Topography generally
slopes from a south to north direction with an elevation loss of approximately 120 feet over an
approximate distance of 1.1 miles. Surface water drainage generally follows site topography
10

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan ��
Buck Combined Cycle Station Ash Basin
5.0 INITIAL CONCEPTUAL SITE MODEL
and flows from the south to the north across the site except where natural drainage patterns
have been modified by the ash basin or other construction. Unnamed drainage features are
located near the western and eastern edges of the site and generally flow south to the Yadkin
River. The approximate pond elevations for the three ash basin cells are: Cell 1 — 705 feet;
Cell 2 — 682 feet; Cell 3 — 674 feet. The elevation of the Yadkin River at the site is
approximately 620 feet.
In addition to the ash basin, an unlined dry ash storage area is located topographically
upgradient and adjacent to the east side of Cell 1. The dry ash storage area was constructed in
2009 by excavating ash within the eastern half of Cell 1 in order to provide additional capacity
for sluiced ash.
A soil stockpile is located immediately south of the Cell 1 discharge tower as shown on Figures
2 and 3. The stockpile is a remnant of the construction of the canal leading from Cell 1 to Cell
2. The stockpile does not contain ash and therefore is not included within the waste boundary.
5.1.1 Ash Basin
Coal ash residue from the coal combustion process was disposed in the BCCS ash basin until
the last coal-fired generating units were retired in April 2013. The construction sequence of the
ash basin was described in Section 2.0.
All coal ash from BSS was disposed of in the ash basin from approximately 1957 until 2013. Fly
ash precipitated from flue gas and bottom ash collected in the bottom of the boilers were sluiced
to the ash basin using conveyance water withdrawn from the Yadkin River. Until Cell 1 was
constructed, ash generated from the coal combustion process at BSS was sluiced (via ash
discharge lines) to the northwest corner of Cell 2. Following construction of Cell 1, sluiced ash
was re-routed from Cell 2 to the north side of Cell 1.
The discharge flow from Cell 1 enters Cell 2 via the Primary Cell Discharge Tower. Flow from
Cell 2 enters Cell 3 via the Old Primary Cell Discharge Structure. Flow is discharged to the
Yadkin River through the Secondary Cell Discharge Tower located at the north end of Cell 3.
The concrete discharge tower drains through a 36-inch-diameter, slip -lined corrugated metal
pipe.
The approximate pond elevations for the three ash basin cells are: Cell 1 — pond elevation 705
feet; Cell 2 — pond elevation 682 feet; Cell 3 — pond elevation 674 feet. The elevation of the
Yadkin River near the site is approximately 620 feet. The ash basin pond elevations are
controlled by the use of concrete stop logs in the three discharge towers.
The area contained within the waste boundary for Cell 1 encompasses approximately 90 acres.
For purposes of delineating the waste boundary, Cells 2 and 3 are considered a single unit, with
the area contained within this portion of the waste boundary encompassing approximately 80.7
acres. The ash basin waste boundary is shown on Figures 2 and 3.
The quantity of ash contained within the ash basin was estimated by comparing the digitized
pre -basin topographic survey of the site to the latest topographic and bathymetric survey of the
basin, dated November 2013, which was after the last coal-fired generating unit was retired.
11

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan ��
Buck Combined Cycle Station Ash Basin
5.0 INITIAL CONCEPTUAL SITE MODEL
The estimated in -place quantities of ash are: Cell 1 — 2,366,000 cubic yards (cy), Cell 2 —
1,624,000 cy, and Cell 3 — 227,000 cy. Actual ash quantities may be greater than those
calculated since soil borrow operations are known to have taken place within the ash basin
boundaries prior to the deposition of ash.
During operation of the coal-fired units, the ash basin received variable inflows from the ash
removal system and other permitted discharges. Currently, the ash basin receives variable
inflows from the station yard drain sump, stormwater flows, BSS wastewater, and BCCS
wastewater. Currently, Duke Energy is evaluating alternatives from removing these flows from
the ash basin in order to allow total decommissioning of the ash basin.
5.1.2 Dry Ash Storage Area
An unlined dry ash storage area is located topographically upgradient and adjacent to the east
side of Cell 1. The dry ash storage area was constructed in 2009 by excavating ash within the
eastern half of Cell 1 in order to provide additional capacity for sluiced ash. Following the
completion of excavation and stockpiling, the dry ash storage area was graded to drain and a
minimum of 18 and 24 inches of soil cover were placed on the top slopes and sideslopes,
respectively, and vegetation was established. The estimated in -place quantity of ash stored at
this location is 209,000 cy based on a comparison of original site topography and the latest
topographic survey of the site from November 2013.
5.2 Source Characteristics
The ash in the ash basin consists of fly ash and bottom ash produced from the combustion of
coal. The physical and chemical properties of coal ash are determined by reactions that occur
during the combustion of the coal and subsequent cooling of the flue gas. In general, coal is
dried, pulverized, and conveyed to the burner area of a boiler for combustion. Material that
forms larger particles of ash and falls to the bottom of the boiler is referred to as bottom ash.
Smaller particles of ash, fly ash, are carried upward in the flue gas and are captured by an air
pollution control device. Approximately 70% to 80% of the ash produced during coal
combustion is fly ash (EPRI 1993). Typically 65% to 90% of fly ash has particle sizes that are
less than 0.010 millimeter (mm). Bottom ash particle diameters can vary from approximately 38
mm to 0.05 mm.
The chemical composition of coal ash is determined based on many factors including the source
of the coal, the type of boiler where the combustion occurs (the thermodynamics of the boiler),
and air pollution control technologies employed. The major elemental composition of fly ash
(approximately 90% by weight) is composed of mineral oxides of silicon, aluminum, iron, and
calcium. Minor constituents such as magnesium, potassium, titanium, and sulfur comprise
approximately 8% of the mineral component, while trace constituents such as arsenic,
cadmium, lead, mercury, and selenium make up less than approximately 1 % of the total
composition (EPRI 2009). Other trace constituents in coal ash (fly ash and bottom ash) consist
of antimony, barium, beryllium, boron, chromium, copper, lead, mercury, molybdenum, nickel,
selenium, strontium, thallium, uranium, vanadium, and zinc (EPRI 2009).
12

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan ��
Buck Combined Cycle Station Ash Basin
5.0 INITIAL CONCEPTUAL SITE MODEL
In addition to these constituents, coal ash leachate contains chloride, fluoride, sulfate, and
sulfide. In the U.S. Environmental Protection Agency's (EPA's) Proposed Rules Disposal of
Coal Combustion Residuals From Electric Utilities Federal Register / Vol. 75, No. 118 / Monday,
June 21, 2010, 35206, EPA proposed that the following constituents be used as indicators of
groundwater contamination in the detection monitoring program for coal combustion residual
landfills and surface impoundments: boron, chloride, conductivity, fluoride, pH, sulfate, sulfide,
and total dissolved solids (TDS). In selecting the constituents for detection monitoring, EPA
selected those that are present in coal combustion residuals that would move rapidly through
the subsurface, thereby, providing an early indication that contaminants were migrating from the
landfill or ash basin.
In the 1998 Report to Congress Wastes from the Combustion of Fossil Fuels (USEPA 1998),
EPA presented waste characterization data for CCP wastes in impoundments and in landfills.
The constituents listed were: arsenic, barium, beryllium, boron, cadmium, chromium, cobalt,
copper, lead, manganese, nickel, selenium, silver, thallium, strontium, vanadium, and zinc. In
this report, the EPA reviewed radionuclide concentrations in coal and ash and ultimately,
eliminated radionuclides from further consideration due to the low risks associated with the
radionuclides.
The geochemical factors controlling the reactions associated with leaching of ash and the
movement and transport of the constituents leached from ash is complicated. The mechanisms
that affect movement and transport vary by constituent, but, in general, are mineral equilibrium,
solubility, and adsorption onto inorganic soil particles. Due to the complexity associated with
understanding or identifying the specific mechanism controlling these processes, HDR believes
that the effect of these processes are best considered by determination of site -specific, soil -
water distribution coefficient, Kd, values as described in Section 7.7.
The oxidation -reductions and precipitation -dissolution reactions that occur in a complex
environment, such as an ash basin, are poorly understood. In addition to the variability that
might be seen in the mineralogical composition of the ash, based on different coal types,
different age of ash in the basin, etc., it would be anticipated that the chemical environment of
the ash basin would vary over time and over distance and depth, increasing the difficulty of
making specific predictions related to concentrations of specific constituents.
HDR does not believe that conditions in the site groundwater will be likely to produce methane;
therefore methane was not included in the sample parameters.
Duke Energy has performed limited leaching analysis on fly ash and bottom ash. Available data
is presented in Table 3.
Due to the complex nature of the geochemical environment and processes in the ash basin,
HDR believes that the most useful representation of the potential impacts to groundwater will be
obtained from the sampling and analyses of ash in the basin and from pore water and
groundwater samples proposed in Section 7.0 of this work plan.
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Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan ��
Buck Combined Cycle Station Ash Basin
5.0 INITIAL CONCEPTUAL SITE MODEL
Understanding the factors controlling the mobility, retention, and transport of the constituents
that may leach from ash are also complicated by the complex nature of the geochemical
environment of the ash basin combined with the complex geochemical processes occurring in
the soils beneath the ash basin along the groundwater flow paths. Mobility, retention, and
transport of the constituents can vary by each individual constituent. As these processes are
complex and are highly dependent on the mineral composition of the soils, it will not be possible
to determine with absolute clarity the specific mechanism that controls the mobility and retention
of the constituents; however, the effect of these processes will be represented by the
determination of the site -specific soil -water distribution coefficient, Kd, values as described in
Section 7.7. As described in that section, samples will be collected to develop Kd terms for the
various materials encountered at the site. These Kd terms are then to be used as part of the
groundwater modeling, if required to predict concentrations of constituents at the compliance
boundary.
The site residual soils were formed by in -place weathering of meta -quartz diorite, mica schist,
and biotite gneiss. Iron (Fe) and manganese (Mn), present in groundwater at a number of the
on -site monitoring wells, are constituents of the bedrock, primarily in ferro-magnesium minerals.
Manganese substitutes for iron and magnesium in a number of minerals and is enriched in
mafic and ultramafic lithologies relative to felsic lithologies (1,000 ppm in basalt and 400 ppm in
granite; Krauskopf 1972). In the Piedmont, manganese oxides occur as thin coatings along
bedrock fractures and as thin -coatings along relict discontinuities in saprolite. Manganese
ranges from 20 to 3,000 ppm in residual soils (Krauskopf 1972).
In a study in Orange County, North Carolina, Cunningham and Daniel (2001) reported
manganese in 94% and iron in 80% of the drinking water wells tested. Iron exceeded North
Carolina drinking water standards in 6% of the wells and for manganese in 24% of the wells
(Cunningham and Daniel 2001). In more recent study, Gillispie (2014) found that approximately
50% of wells in North Carolina have manganese concentrations exceeding the state standard of
0.05 mg/L (Gillispie 2014). The manganese detected in water wells at ten NC Division of Water
Resources groundwater research stations studied by Gillispie (2014) is naturally derived and
concentrations are spatially variable ranging from less than 0.01 to greater than 2 mg/L.
5.3 Hydrogeologic Site Characteristics
Based on lithological data obtained from soil boring and well installation activities conducted by
HDR during ash basin closure assessment activities (HDR, 2014C), subsurface stratigraphy
consists of the following material types: fill, ash, residual soil, saprolite, alluvium, partially
weathered rock (PWR), and bedrock. In general, residual soil, saprolite, and PWR were
encountered on most areas of the site. Ash was encountered within the ash basin and ash
storage area, while alluvium was restricted to areas adjacent to historical drainage features in
the northwest portion of Cell 1 and the northeast portion of Cell 3 (i.e., near the Cell 1 and Cell 3
dams). Bedrock was encountered between 67 feet and 113 feet in several deep borings
completed within Cells 1, 2, and 3.
Cross sections depicting the hydrostratigraphic units were developed for the ash basin closure
assessment activities. The site plan and cross sections are shown in Appendix B.
14

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan ��
Buck Combined Cycle Station Ash Basin
5.0 INITIAL CONCEPTUAL SITE MODEL
The general stratigraphic units, in sequence from the ground surface down, are defined as
follows:
• Fill — Fill material generally consisted of re -worked silts and clays that were borrowed
from one area of the site and re -distributed to other areas. Fill was used in the
construction of dikes and as cover for the ash storage area.
• Ash — Ash was encountered in borings advanced within the ash basin and ash storage
area. Ash was generally described as gray to black with a silty to sandy texture,
consistent with fly ash and bottom ash.
• Alluvium — Alluvium is unconsolidated soil and sediment that has been eroded and
redeposited by streams and rivers. Alluvium may consist of a variety of materials
ranging from silts and clays to sands and gravels. Alluvium was encountered in two
borings located in areas adjacent to historical drainage features in the northwest portion
of Cell 1 and the northeast portion of Cell 3 (i.e., near the Cell 1 and Cell 3 dams), and
consisted of dark bluish gray poorly graded sand and black organic -laden soil.
• Residual Soil — The soil that develops by in -place weathering and consists of orange,
tan, brown, gray, or black sandy silt to silty sand. This unit was encountered in various
thicknesses across the site. The residual soil horizon grades into saprolite at depth.
• Saprolite — Saprolite develops by the in -place weathering of igneous and metamorphic
rocks. Saprolite is characterized by the preservation of structures that were present in
the unweathered parent bedrock.
• Partially Weathered Rock (PWR) — PWR occurs between the saprolite and bedrock
and contains saprolite and rock remnants. The unit is described as brown, tan, white, or
gray silty sand with trace rock fragments and reddish brown to grayish green silt with
mica.
• Bedrock — Bedrock was encountered in four deep borings completed within Cells 1, 2,
and 3. Bedrock was described as meta -quartz diorite, mica schist, and biotite gneiss.
Hydraulic conductivity in these hydrostratigraphic units can vary, but is generally thought to fall
within the ranges provided in the table below where Kh refers to hydraulic conductivity in the
horizontal direction and Kv refers to hydraulic conductivity in the vertical direction:
Hydrostratigraphic Unit
Range of k Values (cm/sec)
Fill (Kh)2
1.0E-06 to 1.0E-04
Ash (Kh)5
1.0 E-06 to 1.0E-04
Ash (Kv)°
2.8E-05 to 1.2E-04
Alluvium (Kh)l'3
1.3E-06 to 2.7E-03
Residual Soil/Saprolite (Kh)''3
9.7E-07 to 1.8E-02
Partially Weathered/ Fractured Rock —
1.9E-06 to 3.3E-02
TZ (Kh)
L Bedrock (Kh)l'3
1.8E-07 to 9.9E-03
'
Notes:
1. Data from in -situ permeability tests at sites within the Carolina Piedmont
15

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan ��
Buck Combined Cycle Station Ash Basin
5.0 INITIAL CONCEPTUAL SITE MODEL
2. Estimates for F (fill) based on data that indicates the `k' for fill is about an order of magnitude lower than
the in -situ material used for the fill (after compaction).
3. Hydraulic Conductivity Database - HDR (unpublished data).
4. Hydraulic Conductivity data from site -specific laboratory testing of Shelby tube samples from BCCS (HDR,
2014C)
5. Data from in -situ permeability tests at ash basins located within the Carolina Piedmont.
As the site is located in the Piedmont, it is anticipated that the groundwater flow will be primarily
in the saprolite and the transition zone material with flow also occurring in the fractured or
weathered zones in bedrock. Site data on the physical transport characteristics such as
porosity and hydraulic conductivity of the site exists from the Data Report for the conceptual ash
basin closure at the Buck site (HDR, 2014C). The sampling and testing proposed in Section 7
will provide additional information on the transport characteristics of the materials at the site.
Groundwater flow and transport at the Buck site are assumed to follow the local slope aquifer
system, as described by LeGrand (2004). Under natural conditions, the general direction of
groundwater flow can be approximated from the surface topography. A topographic divide is
located approximately along Leonard Road, to the south of the ash basin. This topographic
divide likely also functions as a groundwater divide. The Yadkin River is located to the north of
the ash basin. The predominant direction of groundwater flow from the ash basin is likely in a
northerly direction, generally towards the Yadkin River.
Groundwater recharge in the Piedmont is derived entirely from infiltration of local precipitation.
Groundwater recharge occurs in areas of higher topography (i.e., hilltops) and groundwater
discharge occurs in lowland areas bordering surface water bodies, marshes, and floodplains
(LeGrand 2004). At the Buck site, groundwater recharge is expected to occur on the southern
portion of the site where topography is higher. Groundwater is expected to discharge into
tributary drainage features or into the Yadkin River to the north.
Following completion of the groundwater assessment work, a site conceptual model will be
developed, as described in Section 7.5.
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Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
6.0 COMPLIANCE GROUNDWATER MONITORING
6.0 Compliance Groundwater Monitoring
As described in Section 2.3, groundwater monitoring is required as a condition of the NPDES
permit. From March 2011 through November 2014, the compliance groundwater monitoring
wells at the Buck site have been sampled a total of 12 times. During this period, these
monitoring wells were sampled in:
• March 2011
• July 2011
• November 2011
• March 2012
• July 2012
• November 2012
• March 2013
• July 2013
• November 2013
• March 2014
• July 2014
• November 2014
With the exception of boron, chromium, iron, manganese, pH, sulfate, and TDS, the results for
all monitored parameters and constituents were less than the 2L Standards. Table 2 lists the
range of exceedances for boron, chromium, iron, manganese, pH, sulfate, and TDS for the
period of March 2011 through July 2014.
HDR previously prepared a draft data report in support of the conceptual design of the ash
basin closure at the Buck site (HDR, 2014C). Results from this data report will be considered
as supplemental data for the groundwater assessment work required by the NORR. In addition,
select existing monitoring wells associated with the conceptual ash basin closure assessment
will be resampled to supplement groundwater quality data for this groundwater assessment.
All available groundwater quality data for compliance monitoring wells, voluntary monitoring
wells, and conceptual closure monitoring wells (as mentioned above and shown on Figure 2)
are summarized on Table 4. In addition, soil and ash quality data from the draft conceptual
closure data report are provided in Table 5. Surface water quality data from the draft
conceptual closure data report are provided in Table 6. Ash basin pore water data from the
draft conceptual closure data report are provided in Table 7. Seep analytical results are
provided in Table 8.
Compliance groundwater monitoring will continue as scheduled in accordance with the
requirements of the NPDES permit.

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
7.0 ASSESSMENT WORK PLAN
7.0 Assessment Work Plan
Solid and aqueous media sampling will be performed to provide information pertaining to the
horizontal and vertical extent of potential soil and groundwater contamination and to determine
physical properties of the ash and soil. Based on readily available site background information,
and dependent upon accessibility, HDR anticipates collecting the following samples as part of
the subsurface exploration plan:
• Ash and soil samples from borings within and beneath the ash basin and ash storage
area,
• Soil samples from borings located outside the ash basin and ash storage area
boundaries,
• Groundwater samples from proposed monitoring wells,
• Surface water samples from water bodies located within the ash basin waste boundary,
• Surface water and sediment samples from surface water locations potentially impacted
by the ash basin due to their proximity to or downgradient locations from the basinas
well as an upgradient background location, and
• Seep samples from locations identified as part of Duke Energy's NPDES permit renewal
application (from July and August 2014).
In addition, hydrogeologic evaluation testing will be conducted during and following monitoring
well installation activities, as described in Section 7.1.6. Existing groundwater quality data from
compliance monitoring wells, voluntary monitoring wells, and ash basin closure monitoring wells
will be used to supplement data obtained from this assessment work.
A summary of the proposed exploration plan, including estimated sample quantities and
estimated depths of soil borings and monitoring wells, is presented in Table 9. The proposed
sampling locations are shown on Figure 3.
Groundwater samples collected from compliance monitoring wells MW-8S/D, MW-6S, MW-12S,
and MW-13D are located at or close to the Duke Energy property line and have shown
exceedances of the 2L Standards. These exceedances have primarily consisted of iron and/or
manganese, with chromium exceedances limited to monitoring well MW-12S only in 2011.
Upon approval of the work plan, HDR proposes to perform an evaluation of these exceedances
with respect to turbidity and to naturally occurring background conditions. If that evaluation
finds the exceedances are caused by turbidity, the well(s) will be redeveloped and replaced, if
required, as described in Section 7.2.1. If that evaluation finds that the exceedances are not
caused by turbidity or naturally occurring conditions, then additional monitoring wells will be
installed to delineate the extent of the exceedances. The proposed potential locations would
not be located on Duke Energy property and would require permission from the adjacent
property owners. The proposed potential locations of these wells are shown on Figure 3. The
installation depths of the well screens will be determined based on site conditions and the depth
of the compliance wells with the exceedance.

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan ��
Buck Combined Cycle Station Ash Basin
7.0 ASSESSMENT WORK PLAN
If it is determined that additional investigations are required during the review of existing data or
data developed from this assessment, Duke Energy will notify the NCDENR regional office prior
to initiating additional sampling or investigations.
7.1 Subsurface Exploration
Characterization of subsurface materials will be conducted through the completion of soil
borings and borings performed for installation of monitoring wells as shown on Figure 3.
Installation details for soil borings and monitoring wells, as well as estimated sample quantities
and depths, are described below and presented in Table 9.
For nested monitoring wells, the deep monitoring well boring will be utilized for characterization
of subsurface materials and samples will be collected for laboratory analysis. Shallow, deep,
and bedrock monitoring well borings will be logged in the field as described below.
At the conclusion of well installation activities, well construction details — including casing depth;
total well depth; and well screen length, slot size, and placement within specific
hydrostratigraphic units — will be presented in tabular form for inclusion into the final CSA
Report. Well completion records will be submitted to NCDENR within 30 days of completion.
Duke Energy acknowledges that subsurface geophysics may be useful for evaluation of
subsurface conditions in areas of the site that have not been significantly reworked by
construction or ash management activities, but less useful in basins and fills. Subsequent to
evaluation of field data obtained during the proposed investigation activities, Duke Energy will
evaluate the need for and potential usefulness of subsurface geophysics in select areas of the
site. If it is determined that subsurface investigation is warranted, Duke Energy and HDR will
notify the NCDENR regional office prior to initiating additional investigations.
7.1.1 Ash and Soil Borings
Characterization of ash and underlying soil will be accomplished through the completion and
sampling of borings advanced at ten locations within Cells 1, 2, and 3 and on the Cell 1 and Cell
3 dams (designated as AB-1 through AB-10) and three locations within the Ash Storage Area
located immediately east of Cell 1 (designated as AS-1 through AS-3). In addition, 14 soil
borings (designated as GWA-1 through GWA-11 and BG-1 through BG-3) will be completed
outside of ash management areas to provide additional soil quality data.
Field data collected during boring advancement will be used to evaluate:
• Presence or absence of ash,
• Areal extent and depth/thickness of ash, and
• Groundwater flow and transport characteristics, if groundwater is encountered.
Borings will be advanced using hollow stem auger or roller cone drilling techniques to facilitate
collection of downhole data. Standard Penetration Testing (SPT) (ASTM D 1586) and split -
spoon sampling will be performed at 5-foot increments using an 18-inch split -spoon sampler.
Note that continuous coring will be performed from auger refusal to a depth of at least 50 feet
19

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
7.0 ASSESSMENT WORK PLAN
into competent bedrock for deep bedrock monitoring well borings (designated as BR soil
boring/groundwater monitoring well locations on Figure 3).
Borings will be logged and ash/soil samples will be photographed, described, and visually
classified in the field for origin, consistency/relative density, color, and soil type in accordance
with the Unified Soil Classification System (ASTM D2487/D2488).
BORINGS WITHIN ASH BASIN AND ASH STORAGE AREA
In areas where ash is known or suspected to be present (i.e., AB- and AS -borings), solid phase
samples will be collected for laboratory analysis from the following intervals in each boring:
• Shallow Ash - approximately 3 - 5 feet bgs
• Deeper Ash - approximately 2 feet above the ash/soil interface
• Upper Soil - approximately 2 feet below the ash/soil interface
• Deeper Soil - approximately 8 - 10 feet below the ash/soil interface
If ash is observed to be greater than 30 feet thick, a third ash sample will be collected from the
approximate mid -point depth between the shallow and deeper samples. The ash samples will
be used to evaluate geochemical variations in ash located in the ash basin and ash storage
area. The remaining soil samples will be used to delineate the vertical extent of potential soil
impacts beneath the ash basin and ash storage area.
Ash and soil samples will be analyzed for total inorganic compounds, as presented in Table 10
Select ash samples will be analyzed for leachable inorganic compounds using the Synthetic
Precipitation Leaching Procedure (SPLP) to evaluate the potential for leaching of constituents
from ash into underlying soil. The ash SPLP analytical results will be compared to Class GA
Standards as found in 15A NCAC 02L .0202 Groundwater Quality Standards, last amended on
April 1, 2013 (2L Standards).
Bathymetric surveys performed within the ponded areas of Cells 1, 2, and 3 indicate that ash
exists beneath most, if not all, of the ponded areas at varying depths. Due to safety concerns,
borings will not be completed where ponded water is present within the ash basin. Safety
concerns may also prevent access to proposed boring locations on ash areas where saturated
ash presents stability issues.
BORINGS OUTSIDE ASH BASIN AND ASH STORAGE AREA
Borings located outside the ash basin and ash storage are designated as GWA- and BG
borings.
The soil samples obtained from the above -listed borings will be used to provide additional
characterization of soil conditions outside the ash basin and ash storage area. Solid phase
samples will be collected for laboratory analysis from the following intervals in each boring:
• Approximately 2 - 3 feet above the water table,
• Approximately 2 - 3 feet below the water table,

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
7.0 ASSESSMENT WORK PLAN
• Within the saturated upper transition zone material (if not already included in the two
sample intervals above), and
• From a primary, open, stained fracture within fresh bedrock if existent (bedrock core
locations only).
The laboratory analyses performed on these samples will depend on the nature and quantity of
material collected.
One or more of the above listed sampling intervals may be combined if field conditions indicate
they are in close proximity to each other (i.e., one sample will be obtained that will be applicable
to more than one interval).
The boring locations designated as BG- borings will be used to evaluate site -specific
background soil quality. Solid phase samples will be collected for laboratory analysis from the
following intervals in each boring:
• At approximately ten -foot intervals until reaching the water table (i.e., 0 — 2 feet, 10 — 12
feet, 20 — 22 feet, and so forth),
• Approximately 2 — 3 feet above the water table,
• Approximately 2 — 3 feet below the water table,
• Within the saturated upper transition zone material (if not already included in the sample
intervals above, and
• From a primary, open, stained fracture within fresh bedrock if existent (bedrock core
locations only).
The laboratory analyses performed on these samples will depend on the nature and quantity of
material collected.
One or more of the above listed sampling intervals may be combined if field conditions indicate
they are in close proximity to each other (i.e., one sample will be obtained that will be applicable
to more than one interval).
INDEX PROPERTY SAMPLING AND ANALYSES
In addition, physical properties of ash and soil will be tested in the laboratory to provide data for
use in groundwater modeling. Split -spoon samples will be collected at selected locations, with
the minimum number of samples collected from the material types as follows:
• Fill — 5 samples
• Ash — 5 samples
• Alluvium — 5 samples
• Soil/Saprolite — 5 samples
• Soil/Saprolite (immediately above refusal) — 5 samples
Select split -spoon samples will be tested for:
• Natural Moisture Content Determination, in accordance with ASTM D-2216
• Grain size with hydrometer determination, in accordance with ASTM Standard D-422

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
7.0 ASSESSMENT WORK PLAN
The select split -spoon samples are anticipated to be collected from the following boring
locations:
• Fill — AB-9S/D (two samples) and A1310S/D (three samples)
• Ash — AB-1 D, AB-3S/D, AS-2D, AB-4S/D, and AB-61D
• Alluvium (if present) — AB-4S/D, AB-5S/D, AB-7S/D, AB-9S/D/BR (two samples)
• Soil/Saprolite (two locations each as stated above) — BG-1 S/D/BR, BG-2S/D/BR, GWA-
9S/D, AS-1 S/D, and AS-3S/D
The depth intervals of the select split -spoon samples will be determined in the field by the Lead
Geologist/Engineer.
In addition to split -spoon sampling, a minimum of five thin -walled, undisturbed tubes ("Shelby"
Tubes) in fill, ash, and soil/saprolite layers will be collected from the above -referenced boring
locations. Sample depths will be determined in the field based on conditions encountered
during borehole advancement. The Shelby Tubes will be transported to a soil testing laboratory
and each tube will be tested for the following:
• Natural Moisture Content Determination, in accordance with ASTM D-2216
• Grain size with hydrometer determination, in accordance with ASTM Standard D-422
• Hydraulic Conductivity Determination, in accordance with ASTM Standard D-5084
• Specific Gravity of Soils, in accordance with ASTM Standard D-854
The results of the laboratory soil and ash property determination will be used to determine
additional soil properties such as porosity, transmissivity, and specific storativity. The results
from these tests will be used in the groundwater fate and transport modeling. The specific
borings where these samples are collected from will be determined based on field conditions,
with consideration given to their location relative to use in the groundwater model.
7.1.2 Shallow Monitoring Wells
SHALLOW MONITORING WELLS IN REGOLITH
Groundwater quality and flow characteristics within the regolith aquifer will be evaluated through
the installation, sampling, and testing of 14 shallow monitoring wells at the locations specified
on Figure 3 with an "S" qualifier in the well name (e.g., GWA-1 S). Shallow monitoring wells in
regolith are defined as wells that are screened wholly within the regolith zone and set to bracket
the water table surface at the time of installation.
Shallow monitoring wells will be installed using hollow stem auger or roller cone drilling
techniques. At each monitoring well location, a shallow well will be constructed with a 2-inch-
diameter, schedule 40 PVC screen and casing. Each of these wells will have a 10-foot to 15-
foot pre -packed well screen having manufactured 0.010-inch slots.
In the event that the regolith zone is found to be relatively thick at a particular well location and
that more than one discreet flow zone is observed during drilling (e.g., presence of confining
unit), a second shallow monitoring well will be installed to provide groundwater flow and quality

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
7.0 ASSESSMENT WORK PLAN
data for upper and lower flow zones. In these instances, the wells will be designated as "S" and
"SL" to differentiate between the upper and lower shallow wells located in the regolith zone.
SHALLOW MONITORING WELLS IN DAMS
Groundwater quality and flow characteristics of the phreatic surface within ash basin dams not
founded on ash will be evaluated through the installation, sampling and testing of one shallow
monitoring well located on the main dam on the north side of Cell 1 (AB-1OS)and one shallow
monitoring well located on the main dam on the north side of Cell 2 (AB-9S). Wells will be
installed with 10-foot to 15-foot screens with the well screen set to bracket the phreatic surface
at the time of installation.
Shallow monitoring wells will be installed using hollow stem auger or roller cone drilling
techniques. At each monitoring well location, a shallow well will be constructed with a 2-inch-
diameter, schedule 40 PVC screen and casing. Each of these wells will have a 10-foot to 15-
foot pre -packed well screen having manufactured 0.010-inch slots.
SHALLOW MONITORING WELLS IN ASH BASIN POREWATER
The water quality and flow characteristics within the ash basin porewater will be evaluated
through the installation, sampling and testing of 12 porewater wells at the locations specified on
Figure 3. Wells designated as "S" will be installed with 10-foot to15-foot screens with the well
screen set to bracket the water table surface at the time of installation. Wells designated as
"SL" will be installed with the bottom of the well screen set above the ash-regolith interface and
will be installed with 10-foot screens.
These wells will be installed using hollow stem auger or roller cone drilling techniques. The
wells will be constructed with 2-inch-diameter, schedule 40 PVC screen and casing. These
wells will be installed with pre -packed well screens having manufactured 0.010-inch slots.
7.1.3 Deep Monitoring Wells
Groundwater quality and flow characteristics within the transition zone (if present) will be
evaluated through the installation, sampling, and testing of 27 deep monitoring wells at the
locations specified on Figure 3 with a "D" qualifier in the well name (e.g., A13-1 D). Deep
monitoring wells are defined as wells that are screened within the partially weathered/fractured
bedrock transition zone at the base of the regolith.
Deep monitoring wells will be installed using hollow stem augers and rock coring drilling
techniques. At each deep monitoring well location, a double -cased well will be constructed with
a 6-inch-diameter PVC outer casing and a 2-inch-diameter PVC inner casing and well screen.
The purpose of installing cased wells at the site is to prevent possible cross -contamination of
flow zones within the shallow and deeper portions of the unconfined aquifer during well
installation. Outer well casings (6-inch casing) will be advanced to auger refusal and set
approximately 1 foot into PWR (if present). Note that location -specific subsurface geology will
dictate actual casing depths on a per -well basis. The annulus between the borehole and casing
will be grouted to the surface using the tremie grout method. After the grout has been allowed
to cure for a period of 24 hours, the borehole will be extended via coring approximately 10 feet

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to 15 feet into transition zone rock using an HQ core barrel. A 2-inch-diameter well with a 5-foot
pre -packed well screen will be set at least 2 feet below the bottom of the outer casing.
If the PWR thickness is determined to be greater than 30 feet thick at a nested well location,
additional wells in the transition zone will be considered based on site -specific conditions.
Rock cores will be logged in accordance with the Field Guide for Rock Core Logging and
Fracture Analysis by Midwest GeoSciences Group. Percent recovery and rock quality
designation (RQD) will be calculated in the field. The cores will be photographed and retained.
7.1.4 Bedrock Monitoring Wells
Groundwater quality and flow within fractured bedrock beneath the site will be evaluated
through the installation, sampling and testing of 4 bedrock monitoring wells at the locations
specified on Figure 3 with a "BR" qualifier in the name (e.g., GWA-9BR). Bedrock monitoring
wells are defined as wells that are screened across water -bearing fractures wholly within fresh,
competent bedrock.
At these locations, continuous coring will be performed from refusal to a depth of at least 50 feet
into competent bedrock. Packer testing will be performed on select fractures observed in the
rock cores. See Section 7.1.6 for details regarding packer test implementation.
Water sources to be used in rock coring and packer tests will be sampled for all of the
constituents in Table 11 before use.
Rock cores will be logged in accordance with the Field Guide for Rock Core Logging and
Fracture Analysis by Midwest GeoSciences Group. Percent recovery and RQD will be
calculated in the field. The cores will be photographed and retained.
At each of these locations, a double -cased well will be constructed with a 6-inch-diameter PVC
outer casing and a 2-inch-diameter PVC inner casing and well screen. Outer well casings will
be advanced through the transition zone and set approximately 1 foot into competent bedrock.
The annulus between the borehole and casing will be grouted to the surface using the tremie
grout method. After the grout has been allowed to cure for a period of 24 hours, the borehole
will be extended via coring approximately 50 feet into competent bedrock using an HQ core
barrel. A 2-inch-diameter well with a 5-foot, pre -packed well screen will be set at depth across
an interpreted water -bearing fracture or fracture zone, based on the results of packer testing.
Note that location -specific subsurface geology will dictate actual casing depths and screen
placement on a per -well basis.
7.1.5 Well Completion and Development
WELL COMPLETION
As described above, pre -packed screens will be installed around the monitoring well screens to
reduce turbidity during sample collection. The pre -packed screens will consist of environmental
grade sand contained within a stainless steel wire mesh cylinder. The sand gradation in the
pre -packed screen will be made in advance anticipating a wide range of site conditions;
however, HDR believes that the sand will typically be 20/40 mesh silica sand. The

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Geologist/Engineer involved with the specific installation will evaluate field conditions and
determine if changes are required. A minimum one to two -foot -thick bentonite pellet seal,
hydrated with potable water, will be placed above the pre -packed screen. Cement grout will be
placed in the annular space between the PVC casing and the borehole above the bentonite
pellet seal and extending to the ground surface. Each well will be finished at the ground surface
with a two -foot- square concrete well pad and new four -inch or eight -inch steel, above -grade
lockable covers. Following completion, all wells will be locked with a keyed pad lock.
WELL DEVELOPMENT
All newly installed monitoring wells will be developed to create an effective filter pack around the
well screen and to remove fine particles within the well from the formation near the borehole.
Based on site -specific conditions per 15A NCAC 02C .0108(p), appropriate measures (e.g.,
agitation, surging, pumping, etc.) will be utilized to stress the formation around the screen and
the filter pack so that mobile fines, silts, and clays are pulled into the well and removed.
Water quality parameters (specific conductance, pH, temperature, oxidation-reduction potential
(ORP), and turbidity) will be measured and recorded during development and should stabilize
before development is considered complete. Development will continue until development
water is visually clear (< 10 Nephelometric Turbidity Units (NTU) Turbidity) and sediment free as
determined by the absence of settled solids.
If a well cannot be developed to produce low turbidity (< 10 NTU) groundwater samples,
NCDENR will be notified and supplied with the well completion and development measures that
have been employed to make a determination if the turbidity is an artifact of the geologic
materials in which the well is screened.
Following development, sounding the bottom of the well with a water level meter should indicate
a "hard" (sediment -free) bottom. Development records will be prepared under the direction of
the Project Scientist/Engineer and will include development method(s), water volume removed,
and field measurements of temperature, pH, conductivity, and turbidity.
7.1.6 Hydrogeologic Evaluation Testing
In order to better characterize hydrogeologic conditions at the site, falling and constant head
tests, packers tests, and slug tests will be performed as described below. Data obtained from
these tests will be used in groundwater modeling. In addition, historical soil boring data at the
site will be utilized as appropriate to better characterize hydrogeologic conditions and will be
used for groundwater modeling. All water meters, pressure gages, and pressure transducers
will be calibrated per specifications for testing.
FALLING/CONSTANT HEAD TESTS
A minimum of five (5) in -situ borehole horizontal permeability tests, either falling or constant
head tests, will be performed just below refusal in the upper bedrock (transition zone if present).
In each of the hydrostratigraphic units above refusal (ash, fill, alluvium, soil/saprolite), a
minimum of ten falling or constant head tests (five for vertical permeability and five for horizontal
permeability) will be performed. The tests will be at locations based on site -specific conditions
at the time of assessment work. The U.S. Bureau of Reclamation (1995) test method and
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calculation procedures as described in Chapter 10 of their Ground Water Manual (2nd Edition)
will be used.
PACKER TESTS
A minimum of five (5) packer tests using a double packer system will be performed in deep
well/transition zone borings at locations based on site -specific conditions, as well as a minimum
of one (1) packer test in each soil/rock core well boring, as described in Section 7.1.4 after
completion of the holes. Packer tests will utilize a double packer system and the interval (5 feet
or 10 feet based on field conditions) to be tested will be based on observation of the rock core
and will be selected by the Lead Geologist/Engineer. The U.S. Bureau of Reclamation (1995)
test method and calculation procedures as described in Chapter 10 of their Ground Water
Manual (2nd Edition) will be used.
SLUG TESTS
Hydraulic conductivity (slug) tests will be completed in all installed monitoring wells under the
direction of the Lead Geologist/Engineer. Slug tests will be performed to meet the requirements
of the NCDENR Memorandum titled, "Performance and Analysis of Aquifer Slug Tests and
Pumping Tests Policy," dated May 31, 2007. Water level change during the slug tests will be
recorded by a data logger. The slug test will be performed for no less than ten minutes, or until
such time as the water level in the test well recovers 95% of its original pre -test level, whichever
occurs first. Slug tests will be terminated after two hours even if the 95% pre -test level is not
achieved. Slug test field data will be analyzed using the Aqtesolv (or similar) software using the
Bouwer and Rice method.
Groundwater Sampling and Analysis
Subsequent to monitoring well installation and development, each newly installed well will be
sampled using low -flow sampling techniques in accordance with USEPA Region 1 Low Stress
(low flow) Purging and Sampling Procedure for the Collection of Groundwater Samples from
Monitoring Wells (revised January 19, 2010). The purposes of the proposed monitoring wells
are as follows:
• AB -series Wells —The AB -series well locations were selected to provide water quality
data in and beneath the ash basin and ash basin dikes.
• AS -series Wells — The AS -series well locations were selected to provide additional
groundwater quality data to evaluate the vertical extent of impacted groundwater in the
vicinity of the ash storage area and to evaluate the migration of potentially impacted
groundwater from beneath Cell 1 to Cell 2.
• GWA-series Wells — The GWA-series well locations were selected to provide water
quality data beyond the ash basin waste boundary for use in groundwater modeling (i.e.,
to evaluate the horizontal and vertical extent of potentially impacted groundwater outside
the ash basin waste boundary).
• BG-series Wells — These wells will be used to provide information on background water
quality. The background well locations were selected to provide additional physical
separation from possible influence of the ash basin on groundwater. These wells will

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also be useful in the statistical analysis to determine the site -specific background water
quality concentrations (SSBCs).
During low -flow purging and sampling, groundwater is pumped into a flow -through chamber at
flow rates that minimize or stabilize water level drawdown within the well. Indicator parameters
are measured over time (usually at 5-minute intervals). When parameters have stabilized within
±0.2 pH units and ±10 percent for temperature, conductivity, and dissolved oxygen (DO), and
±10 millivolts (mV) for oxidation-reduction potential (ORP) over three consecutive readings,
representative groundwater has been achieved for sampling. Turbidity levels of 10 NTU or less
will be targeted prior to sample collection. Purging will be discontinued and groundwater
samples will be obtained if turbidity levels of 10 NTU or less are not obtained after 2 hours of
continuous purging. Groundwater samples will be analyzed by a North Carolina certified
laboratory for the constituents included in Table 11. Select constituents will be analyzed for
total and dissolved concentrations.
In 2014, the Electric Power Research Institute published the results of a critical review that
presented the current state -of -knowledge concerning radioactive elements in CCPs and the
potential radiological impacts associated with management and disposal. The review found:
Despite the enrichment of radionuclides from coal to ash, this critical review did not
locate any published studies that suggested typical CCPs posed any significant
radiological risks above background in the disposal scenarios considered, and when
used in concrete products. These conclusions are consistent with previous
assessments. The USGS (1997) concluded that "Radioactive elements in coal and fly
ash should not be sources of alarm. The vast majority of coal and the majority of fly ash
are not significantly enriched in radioactive elements, or in associated radioactivity,
compared to common soils orrocks."A year later, the U.S. EPA (1998) concluded that
the risks of exposure to radionuclide emissions from electric utilities are "substantially
lower than the risks due to exposure to background radiation."
Duke Energy proposes sampling wells MW-3S/D and BG-1 S/D for total combined radium (Ra-
226 and Ra-228) and will consult with DWR regional office to determine if additional wells are to
be sampled.
Groundwater sample results will be compared to Class GA Standards as found in 15A NCAC
02L .0202 Groundwater Quality Standards, last amended on April 1, 2013 (21- Standards).
Redox conditions are not likely to be strong enough to produce methane at the site; therefore,
methane was not included in the constituent list (Table 11).
7.2.1 Compliance and Voluntary Monitoring Wells
Groundwater samples will be collected from selected existing voluntary and/or compliance
monitoring wells. Prior to collecting groundwater samples from the existing voluntary and/or
compliance monitoring wells, the historical turbidity values at each of the wells will be evaluated.
For wells where turbidity levels have historically been greater than 10 NTUs, these wells will be
re -developed, as described above, prior to collecting groundwater samples. If the
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redevelopment does not reduce turbidity level, the well(s) will be replaced. The DWR regional
office will be contact prior to replacement of a compliance monitoring well.
7.2.2 Onsite Water Supply Well
Groundwater samples will be collected from the existing onsite water supply well using the
pumping system installed in the well. Water supply wells will be purged for a minimum of 15
minutes prior to collection of a sample. Water samples will be collected prior to any filtration
system.
7.2.3 Speciation of Select Inorganics
In addition to total analytes, speciation of select inorganics will be conducted for select sample
locations to characterize the aqueous chemistry and geochemistry in locations and depths of
concern. Inorganic speciation of iron (Fe(II), Fe(III)), manganese (Mn(II), Mn(IV)) and chromium
(Cr(III), Cr(VI)) in pore water samples collected from upper and lower elevations of ash within
the basin and in select groundwater and surface water samples collected outside the ash basin.
Laboratory analyses will be performed in accordance with the methods provided in Table 11.
Duke Energy proposes to speciate iron and manganese in pore water samples collected from
proposed wells AB-2S/SL/D, AB-3S/SL/D, AB-4S/SL/D, AB-8S/SL/D and AB-7S/SL/D, in
groundwater samples collected from compliance monitoring wells MW-6S/D, MW-9S, MW-10D,
MW-11 S/D, and MW-12S/D, in groundwater samples collected from proposed wells BG-1 S/D,
and in surface water samples collected from locations S-1 A, S-1 B, and S-1 C.
Duke Energy proposes to speciate chromium in pore water samples collected from the
proposed wells listed above, in groundwater samples collected from compliance monitoring
wells MW-7S and MW-13D, in groundwater samples collected from proposed wells BG-1 S/D,
and in surface water samples collected from locations S-1 A, S-1 B, and S-1 C.
Analytical results from the seep sampling will be reviewed to determine if similar analyses are to
be performed for selected seep locations.
Surface Water, Sediment, and Seep Sampling
7.3.1 Surface Water Samples
WITHIN ASH BASIN
Surface water samples will be collected from Cells 1, 2, and 3 at the approximate open water
locations shown on Figure 3 (SW-AB1 through SW-A137). At each location, two water samples
will be collected — one sample close to the surface (i.e., 0 to 1 foot from surface) and one
sample at a depth just above the ash surface (i.e., 1 foot to 2 feet above the ash to avoid
suspending the ash within the sample). Prior to sampling, the depth to ash will be measured by
slowly lowering a measuring stick or tape until the ash surface is encountered, being careful to
avoid suspending the ash. The depth to ash will be noted, and a sample thief will be slowly
lowered to the desired depth to collect the sample. The sample thief and sample will be
retrieved and the sample will be transferred to the appropriate sample containers provided by
the laboratory. In areas where the water body is less than 5 feet deep, one water sample will be

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collected from the location at a depth just above the ash surface. Ash basin surface water
samples will be analyzed for the same constituents as groundwater samples (Table 11). Select
constituents will be analyzed for total and dissolved concentrations.
OUTSIDE ASH BASIN
Two water samples will be collected from the surface water located west of the ash basin (SW-1
and SW-2) shown on Figure 3. The SW-2 location will be considered a background surface
water sample. A third surface water sample (S-1A) will be collected 3-feet below the surface of
a small pond located southeast of Cell 3 outside of Duke Energy property line. Duke will contact
the property owner and request permission to collect this sample. These surface water samples
will be analyzed for the same constituents as groundwater samples (Table 11). Select
constituents will be analyzed for total and dissolved concentrations.
Analytical results for surface water samples collected from outside the ash basin will be
compared to 15A NCAC 213 .0200 Classifications and Water Quality Standards Applicable to
Surface Waters and Wetlands of North Carolina (213 Standards), from the DWR, and EPA
Criteria Table, last amended on May 15, 2013.
7.3.2 Sediment Samples
Sediment samples will be collected from the bed surface of the surface water located west of
the ash basin (designated as SW-1 and SW-2) and the seep sample locations as shown on
Figure 3 (designated as S-1 through S-10, S-1 B, and S-1 C, respectively). Sediment samples S-
1 B and S-1 C are located off -site on adjacent property. Sample S-1 B is located in a channel
below the dam of a small pond and sample S-1 C is located where seepage emanates into the
channel from the west bank of the channel. Duke will contact the property owner and request
permission to collect this sample. The SW-2 location will be considered a background sediment
sample. The sediment samples will be analyzed for total inorganics using the same
constituents list proposed for the soil and ash samples.
7.3.3 Seep Samples
Water samples will be collected from the seep sample locations shown on Figure 3. These
seep sample locations (designated as S-1 through S-10, S-1 B, and S-1 C) will be collected near
the time of the monitoring well sampling to minimize concerns about potential temporal
variability between surface water and groundwater and analyzed for the constituents listed in
Table 11. Select constituents will be analyzed for total and dissolved concentrations. Seep
samples S-1 B and S-1 C are located off -site on adjacent property. Sample S-1 B is located in a
channel below the dam of a small pond and sample S-1 C is located where seepage emanates
into the channel from the west bank of the channel. Duke will contact the property owner and
request permission to collect this sample.
In March 2014, DENR conducted sampling of seeps and surface water locations at the site.
HDR does not have the analytical results from this sampling event at this time; however, once
data is received, HDR will review the data and determine if changes in the proposed seep or
surface water locations is needed.

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Analytical results from the seep sampling will be reviewed to determine if similar speciation
analyses as described in Section 7.2.3 are to be performed for selected seep locations.
After analytical results for seep samples are reviewed, a determination will be made concerning
collection of additional off -site seep samples. If it is determined that additional off site seep
samples are to be collected, the DWR regional office will be contacted.
7.4 Field and Sampling Quality Assurance/Quality Control
Procedures
Documentation of field activities will be completed using a combination of logbooks, field data
records (FDRs), sample tracking systems, and sample custody records. Site and field logbooks
are completed to provide a general record of activities and events that occur during each field
task. FDRs have been designated for each exploration and sample collection task, to provide a
complete record of data obtained during the activity.
7.4.1 Field Logbooks
The field logbooks provide a daily handwritten account of field activities. Logbooks are
hardcover books that are permanently bound. All entries are made in indelible ink, and
corrections are made with a single line with the author initials and date. Each page of the
logbook will be dated and initialed by the person completing the log. Partially completed pages
will have a line drawn through the unused portion at the end of each day with the author's
initials. The following information is generally entered into the field logbooks:
• The date and time of each entry. The daily log generally begins with the Pre -Job Safety
Brief,
• A summary of important tasks or subtasks completed during the day,
• A description of field tests completed in association with the daily task,
• A description of samples collected including documentation of any quality control
samples that were prepared (rinse blanks, duplicates, matrix spike, split samples, etc.),
• Documentation of equipment maintenance and calibration activities,
• Documentation of equipment decontamination activities, and
• Descriptions of deviations from the work plan.
7.4.2 Field Data Records
Sample FDRs contain sample collection and/or exploration details. A FDR is completed each
time a field sample is collected. The goal of the FDR is to document exploration and sample
collection methods, materials, dates and times, and sample locations and identifiers. Field
measurements and observations associated with a given exploration or sample collection task
are recorded on the FDRs. FDRs are maintained throughout the field program in files that
become a permanent record of field program activities.
7.4.3 Sample Identification
In order to ensure that each number for every field sample collected is unique, samples will be
identified by the sample location and depth interval, if applicable (e.g., MW-11 S (5-6'). Samples
will be numbered in accordance with the proposed sample IDS shown on Figure 3.
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7.4.4 Field Equipment Calibration
Field sampling equipment (e.g., water quality meter) will be properly maintained and calibrated
prior to and during continued use to assure that measurements are accurate within the
limitations of the equipment. Personnel will follow the manufacturers' instructions to determine if
the instruments are functioning within their established operation ranges. The calibration data
will be recorded on a FDR.
To be acceptable, a field test must be bracketed between acceptable calibration results.
• The first check may be an initial calibration, but the second check must be a continuing
verification check.
• Each field instrument must be calibrated prior to use.
• Verify the calibration at no more than 24-hour intervals during use and at the end of the
use, if the instrument will not be used the next day or time periods greater than 24 hours.
• Initial calibration and verification checks must meet the acceptance criteria
recommended by each instrument manufacturer.
• If an initial calibration or verification check fails to meet the acceptance criteria,
immediately recalibrate the instrument or remove it from service.
• If a calibration check fails to meet the acceptance criteria and it is not possible to
reanalyze the samples, the following actions must be taken:
- Report results between the last acceptable calibration check and the failed
calibration check as estimated (qualified with a "J");
- Include a narrative of the problem; and
- Shorten the time period between verification checks or repair/replace the instrument.
• If historically generated data demonstrate that a specific instrument remains stable for
extended periods of time, the interval between initial calibration and calibration checks
may be increased.
- Acceptable field data must be bracketed by acceptable checks. Data that are not
bracketed by acceptable checks must be qualified.
- Base the selected time interval on the shortest interval that the instrument maintains
stability.
- If an extended time interval is used and the instrument consistently fails to meet the
final calibration check, then the instrument may require maintenance to repair the
problem or the time period is too long and must be shortened.
• For continuous monitoring equipment, acceptable field data must be bracketed by
acceptable checks or the data must be qualified.
Sampling or field measurement instruments determined to be malfunctioning will be repaired or
will be replaced with a new piece of equipment.
7.4.5 Sample Custody Requirements
A program of sample custody will be followed during sample handling activities in both field and
laboratory operations. This program is designed to assure that each sample is accounted for at
all times. The appropriate sampling and laboratory personnel will complete sample MRS,
chain -of -custody records, and laboratory receipt sheets.
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The primary objective of sample custody procedures is to obtain an accurate written record that
can trace the handling of all samples during the sample collection process, through analysis,
until final disposition.
FIELD SAMPLE CUSTODY
Sample custody for samples collected during each sampling event will be maintained by the
personnel collecting the samples. Each sampler is responsible for documenting each sample
transfer, maintaining sample custody until the samples are shipped off -site, and sample
shipment. The sample custody protocol followed by the sampling personnel involves:
• Documenting procedures and amounts of reagents or supplies (e.g., filters) which
become an integral part of the sample from sample preparation and preservation;
• Recording sample locations, sample bottle identification, and specific sample acquisition
measures on appropriate forms;
• Using sample labels to document all information necessary for effective sample tracking;
and,
• Completing sample FDR forms to establish sample custody in the field before sample
shipment.
Prepared labels are normally developed for each sample prior to sample collection. At a
minimum, each label will contain:
• Sample location and depth (if applicable),
• Date and time collected,
• Sampler identification, and
• Analyses requested and applicable preservative.
A manually -prepared chain -of -custody record will be initiated at the time of sample collection.
The chain -of -custody record documents:
• Sample handling procedures including sample location, sample number and number of
containers corresponding to each sample number;
• The requested analysis and applicable preservative;
• The dates and times of sample collection;
• The names of the sampler(s) and the person shipping the samples (if applicable);
• The date and time that samples were delivered for shipping (if applicable);
• Shipping information (e.g., Fed Ex Air Bill); and,
• The names of those responsible for receiving the samples at the laboratory.
Chain -of -custody records will be prepared by the individual field samplers.
SAMPLE CONTAINER PACKING
Sample containers will be packed in plastic coolers for shipment or pick up by the laboratory.
Bottles will be packed tightly to reduce movement of bottles during transport. Ice will be placed
in the cooler along with the chain -of -custody record in a separate, resealable, air tight, plastic
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bag. A temperature blank provided by the laboratory will also be placed in each cooler prior to
shipment if required for the type of samples collected and analyses requested.
7.4.6 Quality Assurance and Quality Control Samples
The following Quality Assurance/Quality Control samples will be collected during the proposed
field activities:
• Equipment rinse blanks (one per day);
• Field Duplicates (one per 20 samples per sample medium)
Equipment rinse blanks will be collected from non -dedicated equipment used between wells and
from drilling equipment between soil samples. The field equipment is cleaned following
documented cleaning procedures. An aliquot of the final control rinse water is passed over the
cleaned equipment directly into a sample container and submitted for analysis. The equipment
rinse blanks enable evaluation of bias (systematic errors) that could occur due to
decontamination.
A field duplicate is a replicate sample prepared at the sampling locations from equal portions of
all sample aliquots combined to make the sample. Both the field duplicate and the sample are
collected at the same time, in the same container type, preserved in the same way, and
analyzed by the same laboratory as a measure of sampling and analytical precision.
Field QA/QC samples will be analyzed for the same constituents as proposed for the soil and
groundwater samples, as identified on Tables 10 and 11, respectively.
7.4.7 Decontamination Procedures
DECONTAMINATION PAD
A decontamination pad will be constructed for field cleaning of drilling equipment. The
decontamination pad will meet the following requirements:
• The pad will be constructed in an area believed to be free of surface contamination.
• The pad will be lined with a water -impermeable material with no seams within the pad.
The material should be easily replaced (disposable) or repairable.
• If possible, the pad will be constructed on a level, paved surface to facilitate the removal
of decontamination water. This may be accomplished by either constructing the pad
with one corner lower than the rest or by creating a lined sump or pit in one corner.
• Sawhorses or racks constructed to hold field equipment while being cleaned will be high
enough above ground to prevent equipment from being contacted by splashback during
decontamination.
Decontamination water will be allowed to percolate into the ground adjacent to the
decontamination pad. Containment and disposal of decontamination water is not required.
At the completion of field activities, the decontamination pad will be removed and any sump or
pit will be backfilled with appropriate material.

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DECONTAMINATION OF FIELD SAMPLING EQUIPMENT
Field sampling equipment will be decontaminated between sample locations using potable
water and phosphate and borax -free detergent solution and a brush, if necessary, to remove
particulate matter and surface films. Equipment will then be rinsed thoroughly with tap water to
remove detergent solution prior to use at the next sample location.
DECONTAMINATION OF DRILLING EQUIPMENT
Any downhole drilling equipment will be steam cleaned between boreholes. The following
procedure will be used for field cleaning augers, drill stems, rods, tools, and associated
downhole equipment.
Hollow -stem augers, bits, drilling rods, split -spoon samplers and other downhole
equipment will be placed on racks or sawhorses at least two feet above the floor of the
temporary decontamination pad. Soil, mud, and other material will be removed by hand,
brushes, and potable water. The equipment will be steam cleaned using a high
pressure, high temperature steam cleaner.
Downhole equipment will be rinsed thoroughly with potable water after steam cleaning.
The clean equipment will then be removed from the decontamination pad and either placed on
the drill rig, if mobilizing immediately to the next boring, or placed on and covered with clean,
unused plastic sheeting if not used immediately.
7.5 Site Hydrogeologic Conceptual Model
The data obtained during the proposed assessment will be supplemented by available reports
and data on site geotechnical, geologic, and hydrologic conditions to develop a site
hydrogeologic conceptual model (SCM). The scope of these efforts will depend upon site
conditions and existing geologic information for the site.
The SCM is a conceptual interpretation of the processes and characteristics of a site with
respect to the groundwater flow and other hydrologic processes at the site and will be a
refinement of the ICSM described in Section 5.0.
The NCDENR document, "Hydrogeologic Investigation and Reporting Policy Memorandum,"
dated May 31, 2007, will be used as general guidance. In general, components of the SCM will
consist of developing and describing the following aspects of the site: geologic/soil framework,
hydrologic framework, and the hydraulic properties of site materials. More specifically, the SCM
will describe how these aspects of the site affect the groundwater flow at the site. In addition to
these site aspects, the SCM will:
• Describe the site and regional geology,
• Present longitudinal and transverse cross -sections showing the hydrostratigraphic
layers,
• Develop the hydrostratigraphic layer properties required for the groundwater model,
• Present a groundwater contour map showing the potentiometric surface of the shallow
aquifer, and
• Present information on horizontal and vertical groundwater gradients.

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The SCM will serve as the basis for developing understanding of the hydrogeologic
characteristics of the site and for developing a groundwater flow and transport model.
The historic site groundwater elevations and ash basin water elevations will be used to develop
an historic estimated seasonal high groundwater contour map for the site.
A fracture trace analysis will be performed for the site, as well as onsite/near-site geologic
mapping, to better understand site geology and to confirm and support the SCM.
7.6 Site -Specific Background Concentrations
Statistical analysis will be performed using methods outlined in the Resource Conservation and
Recovery Act (RCRA) Unified Guidance (USEPA, 2009, EPA 530/R-09-007) to develop SSBCs.
The SSBCs will be determined to assess whether or not exceedances can be attributed to
naturally occurring background concentrations or attributed to potential contamination.
Specifically, the relationship between exceedances and turbidity will be explored to determine
whether or not there is a possible correlation due to naturally occurring conditions and/or well
construction. Alternative background boring locations will be proposed to NCDENR if the
background wells shown on Figure 3 are found to not represent background conditions.
Groundwater Fate and Transport Model
A three-dimensional groundwater fate and transport model will be developed for the ash basin
site. The objective of the model process will be to:
• Predict concentrations of the Constituents of Potential Concern (COPC) at the facility's
compliance boundary or other locations of interest over time,
• Estimate the groundwater flow and loading to surface water discharge areas, and
• Support the development of the CSA report and the corrective action plan, if required.
The model and model report will be developed in general accordance with the guidelines found
in the memorandum Groundwater Modeling Policy, NCDENR DWQ, May 31, 2007 (DENR
modeling guidelines).
The groundwater model will be developed from the site hydrogeologic conceptual model (SCM),
from existing wells and boring information provided by Duke Energy, and from information
developed from the site investigation. The model will also be supplemented with additional
information developed by HDR from other Piedmont sites, as applicable. The SCM is a
conceptual interpretation of the processes and characteristics of a site with respect to the
groundwater flow and other hydrologic processes at the site. Development of the SCM is
discussed in Section 7.5.
Although the site is anticipated in general to conform to the LeGrand conceptual groundwater
model, due to the configuration of the ash basin, the additional possible source (ash storage
area), and the boundary conditions present at the site, HDR believes that a three-dimensional
groundwater model would be more appropriate than performing two-dimensional modeling. The
modeling process, the development of the model hydrostratigraphic layers, the model extent (or
domain), and the proposed model boundary conditions are presented below.

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7.7.1 MODFLOW/MT3DMS Model
The groundwater modeling will be performed under the direction of Dr. William Langley, P.E.,
Department of Civil and Environmental Engineering, University of North Carolina Charlotte
(UNCC). Groundwater flow and constituent fate and transport will be modeled using Visual
Modflow 2011.1 (flow engine USGS MODFLOW 2005 from SWS) and MT3DMS.
Duke Energy, HDR, and UNCC considered the appropriateness of using MODFLOW and
MT3DMS as compared to the use of MODFLOW coupled with a geochemical reaction code
such as PHREEQC. The decision to use MODFLOW and MT3DMS was based on the intensive
data requirements of PHREEQC, the complexity of developing an appropriate geochemical
model given the heterogeneous nature of Piedmont geology, and the general acceptance of
MODLFOW and MT3DMS. However, batch simulations of PHREEQC may be used to perform
sensitivity analyses of the proposed sorption constants used with MODFLOW/MT3DMS, as
described below, if geochemistry varies significantly across the site.
Additional factors that were considered in the decision to use MT3DMS as compared to a
reaction based code utilizing geochemical modeling were as follows:
1. Modeling the complete geochemical fate and transport of trace, minor, or major
constituents would require simultaneous modeling of the following in addition to
groundwater flow:
All major, minor, and trace constituents (in their respective species forms) in
aqueous, equilibrium (solid), and complexed phases
• Solution pH, oxidation/reduction potential, alkalinity, dissolved oxygen, and
temperature
• Reactions including oxidation/reduction, complexation, precipitation/dissolution, and
ion exchange
2. Transient versus steady-state reaction kinetics may need to be considered. In general,
equilibrium phases for trace constituents cannot be identified by mineralogical analysis.
In this case, speciation geochemical modeling is required to identify postulated solid
phases by their respective saturation indices.
3. If geochemical conditions across the site are not widely variable, an approach that
considers each modeled COPC as a single species in the dissolved and complexed, or
sorbed, phases is justified. The ratio of these two phases is prescribed by the sorption
coefficient Kd which has dimensions of volume (L3) per unit mass (M). The variation in
geochemical conditions can be considered, if needed, by examining pH,
oxidation/reduction potential, alkalinity, and dissolved oxygen, perhaps combined with
geochemical modeling, to justify the Kd approach utilized by MT3DMS. Geochemical
modeling using PHREEQC (Parkhurst et al. 2013) running in the batch mode can be
used to indicate the extent to which a COPC is subject to solubility constraints, a
variable Kd, or other processes.
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The groundwater model will be developed in general accordance with the guidelines found in
the Groundwater Modeling Policy, NCDENR DWQ, May 31, 2007 and based on discussions
previously conducted concerning groundwater modeling between Duke Energy, HDR, UNCC,
and NCDENR.
7.7.2 Development of Kd Terms
It is critical to determine the ability of the site soils to attenuate, adsorb, or through other
processes reduce the concentrations of COPCs that may impact groundwater. To determine the
capacity of the site soils to attenuate a COPC, the site -specific Kd terms will be developed by
UNCC utilizing soil samples collected during the site investigation. These Kd terms quantify the
equilibrium relationship between chemical constituents in the dissolved and sorbed phases.
For soils at the site, sorption is most likely the reversible, exchange -site type associated with
hydrous oxides of iron on weathered soil surfaces (NCDENR DWQ 2012). Experiments to
quantify sorption can be conducted using batch or column procedures (Daniels and Das 2014).
A batch sorption procedure generally consists of combining soil samples and solutions across a
range of soil -to -solution ratios, followed by shaking until chemical equilibrium is achieved. Initial
and final concentrations of chemicals in the solution determine the adsorbed amount of
chemical and provide data for developing plots of sorbed versus dissolved chemical and the
resultant Kd term. If the plot, or isotherm, is linear, the single -valued Kd is considered linear as
well. Depending on the chemical constituent and soil characteristics, non -linear isotherms may
also result (EPRI 2004).
The column sorption procedure consists of passing a solution of known chemical concentration
through a cylindrical column packed with the soil sample. Batch and column methods for
estimating sorption were considered in development of the Kd terms. UNCC recommends an
adaption of the column method (Daniels and Das 2014) to develop Kd estimates that are more
conservative and representative of in -situ conditions, especially with regard to soil -to -liquid
ratios.
Soil samples with measured dry density and maximum particle size will be placed in lab -scale
columns configured to operate in the up -flow mode. A solution with measured COPC
concentrations will be pumped through each column as effluent samples are collected at regular
intervals over time. When constituent breakthroughs are verified, a "clean" solution (no COPCs)
will be pumped through the columns and effluent samples will be collected as well. Samples will
be analyzed by inductively coupled plasma -mass spectroscopy (ICP-MS) and ion
chromatography (IC) in the Civil & Environmental Engineering laboratories at the EPIC Building,
UNC Charlotte. COPCs measured in the column effluent as a function of cumulative pore
volumes displaced will be analyzed using CXTFIT (Tang et al. 2010) to select the
appropriate adsorption model and associated parameters of the partition coefficient Kd, either
linear, Freundlich, or Langmuir. This allows use of a nonlinear partition coefficient in the event
that the linear partition coefficient is not suitable for the modeled input concentration range.
It is noted that some COPCs may have indeterminate Kd values by the column method due to
solubility constraints and background conditions. In this case, batch sorption tests will be
conducted in accordance with U.S. Environmental Protection Agency (EPA) Technical Resource
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Document EPA/530/SW-87/006-F, Batch -type Procedures for Estimating Soil Adsorption of
Chemicals. COPC-specific solutions will be used to prepare a range of soil -to -solution ratios.
After mixing, supernatant samples will be drawn and analyzed as described above. Plots of
sorbed versus dissolved COPC mass will be used to develop Kd terms. Batch tests will be
performed in triplicate.
When applied in the fate and transport modeling performed by MT3DMS, the Kds will determine
the extent to which COPC transport in groundwater flow is attenuated by sorption. In effect,
simulated COPC concentrations will be reduced, as will their rate of movement in advection in
groundwater.
Ten (10) soil core samples will be selected from representative material at the site for column
tests to be performed in triplicate. Additionally, batch Kd tests, if performed, will be executed in
triplicate.
These Kd terms will apply to the selected soil core samples and background geochemistry of
the test solution including pH and oxidation-reduction potential. In order to make these results
transferable to other soils and geochemical conditions at the site, UNCC recommends that the
core samples with derived Kds and 20 to 25 additional core samples be analyzed for hydrous
ferrous oxides (HFO) content, which is considered to the primary determinant of COPC sorption
capacity of soils at the site. In the groundwater modeling study, the correlation between derived
Kds and HFO content can be used to estimate Kd at other site locations where HFO and
background water geochemistry, especially pH and oxidation-reduction potential, are known. If
significant differences in water geochemistry are observed, batch geochemical modeling can be
used to refine the Kd estimate as described in Section 7.1.1. UNCC recommends that core
samples for Kd and HFO tests be taken from locations that are in the path of groundwater
flowing from the ash impoundments.
Determination of which COPCs will have Kd terms developed will be determined after review of
the analyses on the site ash and review of the site groundwater analyses results. The COPCs
selected will be considered simultaneously in each test. Competitive sorption is taken into
account implicitly in the lab -measured sorption terms as CPOCs are combined into a single test
solution. Significant competition sorption is not anticipated given that COPCs in groundwater,
where present, will be at trace levels.
7.7.3 MODFLOW/MT3DMS Modeling Process
The MODFLOW groundwater model will be developed using the hydrostratigraphic layer
geometry and properties of the site as described in this section. After the geometry and
properties of the model layers are input, the model will be calibrated to existing water levels
observed in the monitoring wells and ash basin. Infiltration into the areas outside of the ash
basin will be estimated based on available information. Infiltration within the basin will be
estimated based on available water balance information and pond elevation data provided by
Duke Energy.
The MT31VIS portion of the model will utilize the Kd terms and the input concentrations of
constituents found in the ash. The leaching characteristics of ash are complex and expected to

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vary with time and as changes occur in the geochemical environment of the ash basin. Due to
factors such as quantity of a particular constituent found in ash, mineral complex, solubility, and
geochemical conditions, the rate of leaching and leached concentrations of constituents will vary
with time and respect to each other. The experience that UNCC brings to this process through
their years of working with leaching and characterization of ash, particularly with Duke Energy
ash, will be of particular value.
Since the ash within the basin has been placed over a number of years, the analytical results
from an ash sample collected during the groundwater assessment is unlikely to represent the
current concentrations that are present in the hydrologic pathway between the ash basin and a
particular groundwater monitoring well or other downgradient location.
As a result of these factors and due to the time period involved in groundwater flow,
• concentrations may vary spatially over time, and
• peak concentrations may not yet have arrived at compliance wells.
The selection of the initial concentrations and the predictions of the concentrations for
constituents with respect to time will be developed with consideration of the following:
• Site specific analytical results from leach tests (SPLP) and from total digestion of ash
samples taken at varying locations and depths within the ash basin and ash storage
area. Note that the total digestion concentrations, if used, would be considered an upper
bound to concentrations and that the actual concentrations would be lower that the
results from the total digestion.
• Analytical results from appropriate groundwater monitoring wells or surface water
sample locations outside of the ash basin.
• Analytical results from monitoring wells installed in the ash basin pore water
(screened -in ash).
• Published or other data on sequential leaching tests performed on similar ash.
The information above will be used with constituent concentrations measured at the compliance
boundary to calibrate the fate and transport model and to develop a representation of the
concentration with respect to time for a particular constituent. The starting time of the model will
correspond to the date that the ash basin was placed in service. The resulting model, which will
be consistent with the calibration targets mentioned above, can then be used to predict
concentrations over space and time.
The model calibration process will consist of varying hydraulic conductivity and retardation
within and between hydrostratigraphic units in a manner that is consistent with measured values
of hydraulic conductivity, sorption terms, groundwater levels, and COPC concentrations.
A sensitivity analysis will be performed for the fate and transport analyses.
The model report will contain the information required by Section II of the NCDENR modeling
guidelines, as applicable.
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7.7.4 Hydrostratigraphic Layer Development
The three-dimensional configuration of the groundwater model hydrostratigraphic layers for a
site will be developed using the Initial Site Conceptual Model (Section 5.0) and from pre-existing
data and data obtained during the site investigation process. The thickness and extent for the
various layers will be represented by a three-dimensional surface model for each
hydrostratigraphic layer. For most sites the hydrostratigraphic layers will include ash, fills (both
for dikes/dam and/or ash landfills/structural fills), soil/saprolite, transition zone (where present),
and bedrock (Section 5.3).
The boring data from the site investigation and from existing boring data, as available and
provided by Duke Energy, will be entered into the RockWorks16TM program. This program,
along with site -specific and regional knowledge of Piedmont hydrogeology, will be used to
interpret and develop the layer thickness and extent across areas of the site where boring data
is not available. The material layers will be categorized based on physical and material
properties such as standard penetration blow count for soil/saprolite, and percent recovery and
RQD for the transition zone and bedrock. The material properties required for the model such as
total porosity, effective porosity, and specific storage for ash, fill, alluvium, and soil/saprolite will
be developed from laboratory testing (grain size analysis as described in Section 7.1.1) and
published data. Hydraulic conductivity (horizontal and vertical) of all layers will be developed
utilizing existing site data, in -situ permeability testing (falling head, constant head, and packer
testing where appropriate), slug tests in completed monitoring wells, laboratory testing of
undisturbed samples (ash, fill, soil/saprolite), and from an extensive database of Piedmont soil
and rock properties developed by HDR (Sections 7.1.1 and 7.1.6). The effective porosity
(primarily fracture porosity) and specific storage of the transition zone and bedrock will be
estimated from published data.
7.7.5 Domain of Conceptual Groundwater Flow Model
The BCCS Ash Basin model domain encompasses that area where groundwater flow will be
simulated to estimate the impacts of coal ash stored at the site. By necessity, the conceptual
model domain extends beyond the ash basin and ash storage area limits to physical or artificial
hydraulic boundaries such that groundwater flow through the area is accurately simulated.
Physical hydraulic boundary types may include specified head, head dependent flux, no -flow,
and recharge at ground surface or water surface. Artificial boundaries, which are developed
based on information from the site investigation, may include the specified head and no -flow
types.
The BSS model domain is planned to be bounded by the southern shore of the Yadkin River to
the north, the unnamed stream and drainage feature to the west between the Yadkin River and
Long Ferry Road, the drainage divide approximately defined by Long Ferry and Leonard Roads
to the south, the drainage feature, small pond, and unnamed stream to the east between
Leonard Road and the Yadkin River.
The lower limit of the model domain coincides with the maximum depth of water yielding
fractures in bedrock. The upper limit coincides with the upper surface of soil, fill, ash, landfilled
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materials, or ash basin water surface, where present. The basis for selecting these boundaries
is described in the following section.
7.7.6 Boundary Conditions for Conceptual Groundwater Flow Model
The northern shore of the Yadkin River is considered to be the specified head type where the
head is the average annual river stage for steady-state simulations, or the stage observed
simultaneously with groundwater level measurements at the site. The Yadkin River is
considered to be the ultimate discharge boundary for all groundwater flowing through the model
domain. The unnamed stream and drainage feature to the west between the Yadkin River and
Long Ferry Road is considered to be the specified head type where the head is approximated
by the water surface of the ephemeral stream, and the no -flow type where there is no surface
water flow. The drainage divide approximately defined by Long Ferry and Leonard Roads to the
south is considered to be the no -flow type. The drainage feature, small pond and unnamed
stream to the east between Leonard Road and the Yadkin River is considered to be the
specified head type where is the head is approximated by the water surface of the ephemeral
stream and pond, and the no -flow type where there is no surface water flow. Stream flow and
seepage measurements, as needed, will be performed to assist in model calibration.
The upper boundary across the site is the recharge type, where recharge is dependent on
regional precipitation estimates and land cover type, either soil, fill, or ash.
Given that the hydrostratigraphic zones across the site are hydraulically connected, these
boundaries are considered to be applicable to both local (shallow) and regional (deep)
groundwater flow. If site conditions are encountered that warrant changes to the proposed
extent of model, NCDENR will be notified.
7.7.7 Groundwater Impacts to Surface Water
If the groundwater modeling predicts exceedances of the 2L Standards at or beyond the
compliance boundary where the plume containing the exceedances would intercept surface
waters, the groundwater model results will be coupled with modeling of surface waters to predict
contaminant concentrations in the surface waters. This work would be performed by HDR in
conjunction with UNCC.
Model output from the fate and transport modeling (i.e. groundwater volume flux and
concentrations of constituents with exceedances of the 2L Standards) will be used as input for
surface water modeling in the adjacent water bodies (i.e., streams or reservoirs). The level of
surface water modeling will be determined based on the potential for water quality impacts in
the adjacent water body. That is, if the available mixing and dilution of the groundwater plume
in the water body is sufficient that surface water quality standards are expected to be attained
within a short distance a simple modeling approach will be used. If potential water quality
impacts are expected to be such that the simple model approach is not sufficient, or if the water
body type requires a more complex analysis, then a more detailed modeling approach will be
used. A brief description of the simple and detailed modeling approaches is presented below.
Simple Modeling Approach — This approach will include the effects of upstream flow on
dilution of the groundwater plume within allowable mixing zone limitations along with

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analytical solutions to the lateral spreading and mixing of the groundwater plume in the
adjacent water body. This approach will be similar to that presented in EPA's Technical
Support Document for Water Quality based Toxics Control (EPA/505/2-90-001) for
ambient induced mixing that considers lateral dispersion coefficient, upstream flow and
shear velocity. The results from this analysis will provide information constituent
concentration as a function of the spatial distance from the groundwater input to the
adjacent water body.
Detailed Modeling Approach — This approach will involve the use of a water quality
model that is capable of representing a multi -dimensional analysis of the groundwater
plume mixing and dilution in the adjacent water body. This method involves segmenting
the water body into model segments (lateral, longitudinal and/or vertical) for calculating
the resulting constituent concentrations spatially in the water body either in a steady-
state or time -variable mode. The potential water quality models that could be used for
this approach include: QUAL2K; CE-QUAL-W2; EFDC/WASP; ECOMSED/RCA; or
other applicable models.
In either approach, the model output from the groundwater model will be coupled with the
surface water model to determine the resulting constituent concentrations in the adjacent water
body spatially from the point of input. These surface water modeling results can be used for
comparison to applicable surface water quality standards to complete determine compliance.
The development of the model inputs would require additional data for flow and chemical
characterization of the surface water that would potentially be impacted. The specific type of
data required (i.e., flow, chemical characterization, etc.) and the locations where this data would
be collected would depend on the surface water body and the modeling approach selected. If
modeling groundwater impacts to surface water is required, HDR and Duke Energy will consult
with the DWR regional office to present those specific data requirements and modeling
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8.0 Risk Assessment
To support the groundwater assessment and inform corrective action decisions, potential risks
to human health and the environment will be assessed in accordance with applicable federal
and state guidance. Initially, screening level human health and ecological risk assessments will
be conducted that include development of conceptual site models (CSM) to serve as the
foundation for evaluating potential risks to human and ecological receptors at the site.
Consistent with standard risk assessment practice, separate CSMs will be developed for the
human health and ecological risk evaluations.
The purpose of the CSM is to identify potentially complete exposure pathways to environmental
media associated with the site and to specify the types of exposure scenarios relevant to
include in the risk analysis. The first step in constructing a CSM is to characterize the site and
surrounding area. Source areas and potential transport mechanisms are then identified,
followed by determination of potential receptors and routes of exposure. Potential exposure
pathways are determined to be complete when they contain the following aspects: 1) a
constituent source, 2) a mechanism of constituent release and transport from the source area to
an environmental medium, 3) a feasible route of potential exposure at the point of contact (e.g.,
ingestion, dermal contact, and inhalation). Completed exposure pathways identified in the CSM
are then evaluated in the risk assessment. Incomplete pathways are characterized by some
gaps in the links between site sources and exposure. Based on this lack of potential exposure,
incomplete pathways are not included in the estimation or characterization of potential risks,
since no exposure can occur via these pathways.
Preliminary constituents of potential concern (COPCs) for inclusion in the screening level risk
assessments will be identified based on the preliminary evaluations performed at the site in
conjunction with recommendations from NCDENR regarding coal ash constituents. Both
screening level risk assessments will compare maximum constituent concentrations to
appropriate risk -based screening values as a preliminary step in evaluating potential for risks to
receptors. Based on results of the screening level risk assessments, a refinement of COPCs
will be conducted and more definitive risk characterization will be performed as part of the
corrective action process if needed.
8.1 Human Health Risk Assessment
As noted above, the initial human health risk assessment (HHRA) will include the preparation of
a CSM, illustrating potential exposure pathways from the source area to possible receptors. The
information gathered in the CSM will be used in conjunction with analytical data collected as
part of the CSA. Although groundwater appears to be the primary exposure pathway for human
receptors, a screening level evaluation will be performed to determine if other potential
exposure routes exist.
The HHRA for the site will include an initial comparison of constituent concentrations in various
media to risk -based screening levels. The data will be screened against the following criteria:
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• Soil analytical results will be compared to USEPA residential and industrial soil Regional
Screening Levels (RSLs) (USEPA, November 2014 or latest update)
• Groundwater results will be compared to USEPA tap water RSLs (USEPA, October
2014) and NCDENR Title 15A, Subchapter 2L Standards (NCDENR, 2006).
• Surface water analytical results will be compared to USEPA national recommended
water quality criteria and North Carolina surface water standards (USEPA, 2006;
NCDENR, 2007).
• The surface water classification as it pertains to drinking water supply, aquatic life,
high/exceptional quality designations and other requirements for other activities (e.g.,
landfill permits, NPDES wastewater discharges) shall be noted.
• Sediment results will be compared to USEPA residential soil RSLs (USEPA, November
2014 or latest update).
• The soil, sediment, and ground water data will also be compared to available
background soil, sediment, and ground water data from previous monitoring and
investigations.
The results of this comparison will be presented in a table, along with recommendations for
further evaluation.
8.1.1 Site -Specific Risk -Based Remediation Standards
If deemed necessary, based on the results of the initial comparison to standards, site -and
media -specific risk -based remediation standards will be calculated in accordance with the
Eligibility Requirements and Procedures for Risk -Based Remediation of Industrial Sites
Pursuant to N.C.G.S. 130A-310.65 to 310.77, North Carolina Department of Environment and
Natural Resources, Division of Waste Management, 29 July 2011.
These calculations will include an evaluation of the following, based on site -specific activities
and conditions:
• Remediation methods and technologies resulting in emissions of air pollutants are to
comply with applicable air quality standards adopted by the Environmental Management
Commission (Commission).
• Site -specific remediation standards for surface waters are to be the water quality
standards adopted by the Commission.
• The current and probable future use of groundwater shall be identified and protected.
Site -specific sources of contaminants and potential receptors are to be identified,
protected, controlled, or eliminated whether on or off the site of the contaminant source.
• Natural environmental conditions affecting the fate and transport of contaminants (e.g.,
natural attenuation) shall be determined by appropriate scientific methods.
• Permits for facilities subject to the programs or requirements of G.S. 130A-310.67(a)
shall include conditions to avoid exceedances of applicable groundwater standards
pursuant to Article 21 of Chapter 143 of the General Statutes; permitted facilities shall be
designed to avoid exceedances of the North Carolina ground or surface water
standards.
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• Soil shall be remediated to levels that no longer constitute a continuing source of
groundwater contamination in excess of the site -specific groundwater remediation
standards approved for the site.
• The potential for human inhalation of contaminants from the outdoor air and other site -
specific indoor air exposure pathways shall be considered during remediation, if
applicable.
• The site -specific remediation standard shall protect against human exposure to
contamination through the consumption of contaminated fish or wildlife and through the
ingestion of contaminants in surface water or groundwater supplies.
• For known or suspected carcinogens, site -specific remediation standards shall be
established at levels not to exceed an excess lifetime cancer risk of one in a million. The
site -specific remediation standard may depart from this level based on the criteria set out
in 40 Code of Federal Regulations § 300.430(e)(9) (July 1, 2003). The cumulative
excess lifetime cancer risk to an exposed individual shall not be greater than one in
10,000 based on the sum of carcinogenic risk posed by each contaminant present.
• For systemic toxicants (non -carcinogens), site -specific remediation standards shall be
set at levels to which the human population, including sensitive subgroups, may be
exposed without any adverse health effect during a lifetime or part of a lifetime. Site -
specific remediation standards for systemic toxicants shall incorporate an adequate
margin of safety and shall take into account cases where two or more systemic toxicants
affect the same organ or organ system.
• A comparison will also be made between the concentrations detected in ground water
and the constituent specific primary drinking water standards, as well as the
concentrations in impacted vs. background levels to determine if there are other
considerations that will need to be addressed in risk management decision making.
The site -specific remediation standards for each medium shall be adequate to avoid
foreseeable adverse effects to other media or the environment that are inconsistent with the
state's risk -based approach.
8.2 Ecological Risk Assessment
The screening level ecological risk assessment (SLERA) for the site will begin with a description
of the ecological setting and development of the ecological CSM specific to the ecological
communities and receptors that may potential be at risk. This scope is equivalent to Step 1:
preliminary problem formulation and ecological effects evaluation (USEPA, 1998).
The screening level evaluation will include compilation of a list of potential ecological receptors
(e.g., plants, benthic invertebrates, fish, birds, etc.). Additionally, an evaluation of sensitive
ecological populations will be performed. Preliminary information on listed rare animal species
at or near the site will be compiled from the North Carolina Natural Heritage Program database
and U.S. Fish and Wildlife Service (USFWS) county list to evaluate the potential for presence of
rare or endangered animal and plant species. Rare natural communities will also be evaluated
and identified if near the site.
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Appropriate state and federal natural resource trustees and their representatives (e.g., USFWS)
will be contacted to determine the potential presence (or lack thereof) of sensitive species or
their critical habitat at the time the screening is performed. If it is determined a sensitive species
or critical habitat is present or potentially present, a survey of the appropriate area will be
conducted. If it is found that sensitive species are utilizing the site, or may in the future, a
finding concerning the likelihood of effects due to site -related contaminants or activities should
be developed and presented to the trustee agency.
The preliminary ecological risk screening will also include, as the basis for the CSM, a
description of the known fate and transport mechanisms for site -related constituents and
potentially complete pathways from assumed source to receptor. An ecological checklist will be
completed for the site as required by Guidelines for Performing Screening Level Ecological Risk
Assessment within North Carolina (NCDENR, 2003).
Following completion of Step 1, the screening level exposure estimate and risk calculations
(Step 2), will be performed in accordance with the Guidelines for Performing Screening Level
Ecological Risk Assessment within North Carolina (NCDENR, 2003). Step 2 estimates the level
of a constituent a plant or animal is exposed to at the site and compares the maximum
constituent concentrations to Ecological Screening Values (ESVs).
Maximum detected concentrations or the maximum detection limit for non -detected constituents
of potential concern (those metals or other chemicals present in site media that may result in
risk to ecological receptors) will be compared to applicable ecological screening values intended
to be protective of ecological receptors (including those sensitive species and communities
noted above, where available) to derive a hazard quotient (HQ). An HQ greater than 1 indicates
potential ecological impacts cannot be ruled out.
ESVs will be taken from the following and other appropriate sources:
• USEPA Ecological Soil Screening Levels
• USEPA Region 4 Recommended Ecological Screening Values
• USEPA National Recommended Water Quality Criteria and North Carolina Standards
The state's SLERA guidance (NCDENR, 2003) requires that constituents be identified as a Step
2 COPC as follows:
• Category 1 — Contaminants with a maximum detection exceeding the ESV
• Category 2 — Undetected contaminants with a laboratory sample quantitation limit
exceeding the ESV
• Category 3 — Detected contaminants with no ESV
• Category 4 — Undetected contaminants with no ESV
Exceedances of the ESVs indicate the potential need for further evaluation of ecological risks at
the site. The frequency, magnitude, pattern and basis of any exceedances should also be
considered.
46

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan ��
Buck Combined Cycle Station Ash Basin
8.0 RISK ASSESSMENT
The process ultimately identifies a Scientific -Management Decision Point (SMDP) to determine
if ecological threats are absent and no further assessment is needed; if further assessment
should be performed to determine whether risks exist; or if there is the possibility of adverse
ecological effects, and therefore, a determination made on whether a more detailed ecological
risk and/or habitat assessment is needed, and if so, the scope of the assessment(s).
47

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
9.0 CSA REPORT
9.0 CSA Report
The CSA report will be developed in the format required by the NORR, which include the
following components:
• Executive Summary
• Site History and Source Characterization
• Receptor Information
• Regional Geology and Hydrogeology
• Site Geology and Hydrogeology
• Soil Sampling Results
• Groundwater Sampling Results
• Hydrogeological Investigation
• Groundwater Modeling results
• Risk Assessment
• Discussion
• Conclusions and Recommendations
• Figures
• Tables
• Appendices
The CSA report will provide the results of one iterative assessment phase. No off -site
assessment or access agreements are anticipated to be utilized during this task, other than for
the possible additional off -site wells discussed in Section 6.0.
The CSA will be prepared to include the items contained in the Guidelines For Comprehensive
Site Assessment (guidelines), included as attachment to the NORR, as applicable. HDR will
provide the applicable figures, tables, and appendices as listed in the guidelines.
As part of CSA deliverables, the following tables, graphs, and maps will be provided, at a
minimum:
• Box (whisker) plots for locations sampled on four or more events showing the quartiles
of the data along with minimum and maximum. Plots will be aligned with multiple
locations on one chart. Similar charts will be provided for each COC.
• Stacked time -series plots will be provided for each COC. Multiple wells/locations will be
stacked using the same x-axis to discern seasonal trends. Turbidity, dissolved oxygen,
ORP, or other constituents will be shown on the plots where appropriate to demonstrate
influence.
• Piper and/or stiff diagrams showing selected monitoring wells and surface water
locations as separate symbols.
• Correlation charts where applicable.
• Orthophoto potentiometric maps for shallow, deep, and bedrock wells.

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan ��
Buck Combined Cycle Station Ash Basin
9.0 CSA REPORT
• Orthophoto potentiometric difference maps showing the difference in vertical heads
between selected flow zones.
• Orthophoto iso-concentration maps for selected COCs and flow zones.
• Orthophoto map showing the relationship between groundwater and surface water
samples for selected COCs.
• Geologic cross -sections.
• Photographs of select split -spoon samples and cores at each boring location.
• Others as appropriate.
Recommendations will be provided in the CSA report for a sampling plan to be performed after
completion of this groundwater assessment. The sampling plan will describe the recommended
sampling frequency, constituent and parameter list, and proposed sampling locations including
monitoring wells, seeps, and surface sample locations as required.
49

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
10.0 PROPOSED SCHEDULE
10.0 Proposed Schedule
Duke Energy will submit the CSA Report within 180 days of NCDENR approval of this Work
Plan. The anticipated schedule for implementation of field work, evaluation of data, and
preparation of the Work Plan is presented in the table below.
Activity Start Date Duration to Complete
Field Exploration Program 10 days following Work Plan approval 75 days
Receive Laboratory Data 14 days following end of Exploration Program 15 days
Evaluate Lab/Field Data, Develop SCM 5 days following receipt of Lab Data 30 days
Prepare and Submit CSA 10 days following Work Plan approval 170 days
The following permits and approvals from NCDENR are potentially required:
• After the access requirements for the proposed well locations are determined, if
required, an application for an erosion and sediment control permit will be submitted to
the Division of Energy, Mineral and Land Resources, Land Quality Section.
• Installation of monitoring wells on the dams and/or dikes must be approved by the
Division of Energy, Mineral and Land Resources Dam Safety Section before drilling can
begin. Information on the location and well installation construction will be submitted as
soon as the locations are finalized.

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan ��
Buck Combined Cycle Station Ash Basin
11.0 REFERENCES
11.0 References
1. Certificate of Public Convenience and Necessity ("CPCN") for the Buck Combined Cycle
Project, 2007 at http://www.duke-energy.com/pdfs/Buck-Updated-Preliminary-CPCN-
Final-06-29-07.pdf
2. Cunningham, W. L. and C. C. Daniels, III. 2001. Investigation of ground -water availability
and quality in Orange County, North Carolina: U. S. Geological Survey, Water -
Resources Investigations Report 00-4286, 59p
3. Daniel, C.C., III, and Sharpless, N.B., 1983, Ground -water supply potential and
procedures for well -site selection upper Cape Fear basin, Cape Fear basin study, 1981-
1983: North Carolina Department of Natural Resources and Community Development
and U.S. Water Resources Council in cooperation with the U.S. Geological Survey, 73 p.
4. Daniels, John L. and Das, Gautam P. 2014. Practical Leachability and Sorption
Considerations forAsh Management, Geo-Congress 2014 Technical Papers: Geo-
characterization and Modeling for Sustainability. Wentworth Institute of technology,
Boston, MA.
5. Electric Power Research Institute (EPRI), 1993. Electric Power Research Institute,
Physical and Hydraulic Properties of Fly Ash and Other By -Products from Coal
Combustion, EPRI TR-101999. February 1993.
6. EPRI. 2009. Electric Power Research Institute, Technical Update — Coal Combustion
Products — Environmental Issues — Coal Ash: Characteristics, Management and
Environmental Issues, EPRI 1019022. September 2009.
7. EPRI 2014. Assessment of Radioactive Elements in Coal Combustion Products, 2014
Technical Report 3002003774, Final Report August 2014.
8. EPRI 2004 Electric Power Research Institute, "Chemical Attenuation Coefficients for
Arsenic Species Using Soil Samples Collected from Selected Power Plant Sites:
Laboratory Studies", Product ID:1005505, December 2004.
9. Fenneman, Nevin Melancthon, 1938. "Physiography of eastern United States."
McGraw-Hill. 1938.
10. Freeze, R. A., J. A. and Cherry, Ground Water, Englewood Cliffs, NJ, Prentice -Hall,
1979.
11. Gillispie, EC., Austin, R., Abraham, J., Wang, S., Bolich, R., Bradley, P., Amoozegar, A.,
Duckworth, O., Hesterberg, D., and Polizzotto, ML. Sources and variability of
manganese in well water of the North Carolina Piedmont. Water Resources Research
51

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan ��
Buck Combined Cycle Station Ash Basin
11.0 REFERENCES
Institute of the University of North Carolina System Annual 2014 Conference, Raleigh,
NC, March 2014. Poster Presentation.
12. Harned, D. A. and Daniel, C. C., III, 1992, The transition zone between bedrock and
regolith: Conduit for contamination?, p. 336-348, in Daniel, C. C., III, White, R. K., and
Stone, P. A., eds., Groundwater in the Piedmont: Proceedings of a Conference on
Ground Water in the Piedmont of the Eastern United States, October 16-18, 1989,
Clemson University, 693p.
13. HDR, 2014A. `Buck Combined Cycle Ash Basin Drinking Water Supply Well and
Receptor Survey, NPDES Permit NC0004774."
14. HDR, 2014B. "Buck Combined Cycle Ash Basin Supplement to Drinking Water Supply
Well and Receptor Survey."
15. HDR, 2014C. "Data Report: Buck Steam Station Ash Basin Closure — Conceptual
Design- Draft."
16. Heath, R.C., 1980, Basic elements of groundwater hydrology with reference to
conditions in North Carolina: U.S. Geo-logical Survey Open -File Report 80-44, 86 p.
17. Heath, R.C. 1984, "Ground -water regions of the United States." U.S. Geological Survey
Water -Supply Paper 2242, 78 p.
18. Krauskopf, K.B., 1972. Geochemistry of micronutrients: in Micronutrients in Agriculture,
J.J. Mortvedt, F.R. Cox, L.M. Shuman, and R.M. Walsh, eds., Soil Science Society of
America, Madison, Wisconsin, p. 7-36.
19. LeGrand, H.E. 1988. Region 21, Piedmont and Blue Ridge. In Hydrogeology, The
Geology of North America, vol. 0-2, ed. W.B. Back, J.S. Rosenshein, and P.R. Seaber,
201-207. Geological Society of America. Boulder CO: Geological Society of America.
20. LeGrand, H.E. 1989. A conceptual model of ground water settings in the Piedmont
region. In Ground Water in the Piedmont, ed. C.C. Daniel III, R.K. White, and P.A.
Stone, 693. Proceedings of a Conference on Ground Water in the Piedmont of the
Eastern United States, Clemson University, Clemson, South Carolina. Charlotte, NC:
U.S. Geological Survey.
21. LeGrand, Harry E., 2004. "A Master Conceptual Model for Hydrogeological Site
Characterization in the Piedmont and Mountain Region of North Carolina, A Guidance
Manual," North Carolina Department of Environment and Natural Resources Division of
Water Quality, Groundwater Section.
22. NCDENR, 2003. Division of Waste Management - Guidelines for Performing Screening
Level Ecological Risk Assessments within North Carolina.
23. NCDENR Memorandum "Performance and Analysis of Aquifer Slug Tests and Pumping
Tests Policy," May 31, 2007.
52

Duke Energy Carolinas, LLC I Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
11.0 REFERENCES
24. NCDENR document, "Hydrogeologic Investigation and Reporting Policy Memorandum,"
dated May 31, 2007.
25. NCDENR DWQ NCDENR Division of Water Quality, "Evaluating Metals in Groundwater
at DWQ Permitted Facilities: A Technical Assistance Document for DWQ Staff", July
2013.
26. Parkhurst, D.L., and Appelo, C.A.J., 2013, Description of input and examples for
PHREEQC version 3—A computer program for speciation, batch -reaction, one-
dimensional transport, and inverse geochemical calculations: U.S. Geological Survey
Techniques and Methods, book 6, chap. A43, 497 p.
27. Tang, G., Mayes, M. A., Parker, J. C., & Jardine, P. M. (2010). CXTFIT/Excel—A modular
adaptable code for parameter estimation, sensitivity analysis and uncertainty analysis for
laboratory or field tracer experiments. Computers & Geosciences, 36(9), 1200-1209.
28. USEPA, 1987. Batch -type procedures for estimating soil adsorption of chemicals
Technical Resource Document 530/SW-87/006-F.
29. USEPA, 1997. Ecological Risk Assessment Guidance for Superfund: Process for
Designing and Conducting Ecological Risk Assessments
30. USEPA, 2001. Region 4 Ecological Risk Assessment Bulletins —Supplement to RAGS.
31. USEPA, 1998. Guidelines for Ecological Risk Assessment.
32. US FWS, 2009. Range -wide Indiana Bat Protection and Enhancement Plan Guidelines,
at http://www.fws.gov/frankfort/pdf/inbatpepguidelines.pdf.
33. US Geological Survey Geological Survey, Akio Ogata and R.B. Banks Professional
Paper 411-A "A Solution of Differential Equation of Longitudinal Dispersion in Porous
Media", 1961
34. US Geological Survey (USGS). 1997. Radioactive elements in coal and fly ash:
abundance, forms, and environmental significance. U.S. Geological Survey Fact Sheet
FS-163-97.
35. USEPA, 1998. Study of Hazardous Air Pollutant Emissions from Electric Utility Steam
Generating Units —Final Report to Congress. Volume 1. Office of Air Quality, Planning
and Standards. Research Triangle Park, NC 27711, EPA-453/R-98-004a.
36. USEPA, 1998. Report to Congress Wastes from the Combustion of Fossil Fuels, Volume
2 Methods, Findings, and Recommendations.

SITE LOCATION MAP DATE
May 3, 2013
DUKE ENERGY CAROLINAS, LLC
BUCK COMBINED CYCLE STATION FIGURE
NPDES PERMIT NO. NC0004774 1
ROWAN COUNTY, NORTH CAROLINA

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Table 1. Groundwater Monitoring Requirements
Well Nomenclature
Monitoring Wells: MW-6S,
Antimony
MW-61), MW-7S, MW-71), MW-8S,
Arsenic
Barium
MW-81), MW-9S, MW-91), MW-106,
Boron
MW-11S, MW-11D, MW-12S,
Cadmium
MW-121), MWA3D
Chloride
Constituents and Parameters Frequency
Chromium 7Nickel Thallium
Copper Nitrate Water Level
Iron pH Zinc March, July,
Lead Selenium November
Manganese Sulfate
Mercury TDS
Tables - Page 1

TABLE 2 - EXCEEDANCES OF 2L STANDARDS MARCH 7, 2011 - JULY 1, 2014
Parameter Boron Chromium Iron Manganese pH
Units Ng/L N9/L Ng/L Ng/L SU
2L Standard 700 10 300 50 6.5 - 8.5
Well ID Range of Exceedances
MW-6S
No
No
323
59 — 135
4.5 —
5.5
Exce dances
Exce dances
MW-6D
No
No
No
No
5.8
Exceedances
Exceedances
Exceedances
Exceedances
MW-7S
No
No
No
55 — 71
5.8 —
6.2
Exce dances
Exce dances
Exceedances
No
No
MW-7D
334 — 453
87 — 129
6.3 —
6.4
Exceedances
Exceedances
No
No
MW-8S
559 — 7,610
62 — 360
6.0—
6.3
Exce dances
Exce dances
No
No
No
MW-81)
307 — 432
6.2 —
6.4
Exceedances
Exceedances
Exceedances
MW-9S
No
No
336 — 584
55 — 88
5.3 —
6.5
Exceedances
Exce dances
No
No
No
MW-91)
370
5.2 —
6.5
Exceedances
Exceedances
Exceedances
MW-10D
No
No
335 — 701
110 — 1,130
5.5 —
6.3
Exce dances
Exce dances
MW-11S
No
No
316 — 1,150
106 — 242
5.8 —
6.3
Exceedances
Exceedances
MW-11D
1,130 — 1,290
No
318 — 7,340
56 — 125
5.5 —
6.0
Exce dances
MW-12S
No
11 — 28
329 — 721
52 — 444
5.9 —
6.3
Exce dances
No
No
No
MW-12D
530 — 1,070
5.9 —
6.4
Exce dances
Exce dances
Exceedances
No
No
No
MW-13D
344 — 1,260
6.1 —
6.4
Exceedances
Exce dances
Exceedances
Sulfate TDS
mg/L mg/L
250 500
No
Exceedances
No
Exceedances
No
Exceedances
No
Exceedances
No
Exceedances
No
Exceedances
No
Exceedances
No
Exceedances
320 — 390
No
Exceedances
No
Exceedances
No
Exceedances
No
Exceedances
No
Exceedances
No
Exceedances
No
Exceedances
No
Exceedances
No
Exceedances
No
Exceedances
No
Exceedances
No
Exceedances
No
Exceedances
561 — 660
No
Exceedances
No
Exceedances
No
Exceedances
No
Exceedances
No
Exceedances
Tables - Page 2

Table 3 - SPLP Leaching Analytical Results
Analytical Parameter
Antimony
Arsenic
Barium
Boron
Cadmium
Chloride
Chromium
Copper
Iron
Lead
Manganese
Mercury
Nickel
Nitrate as N
Selenium
Sulfate
TDS
Thallium
Zinc
Units
pg/L
Ng/L
Ng/L
pg/L
Ng/L
mg/L
Ng/L
mg/kg
pg/L
Ng/L
Ng/L
Ng/L
Ng/L
mg/L
Ng/L
mg/L
mg/L
Ng/L
mg/kg
15A NCAC 02L .0202(g) Groundwater Quality Standard
1*
10
700
700
2
250
10
1
300
15
50
1
100
10
20
250
500
0.2*
1
Analytical Method
SPLP
SPLP
SPLP
SPLP
SPLP
SPLP
SPLP
SPLP
SPLP
SPLP
SPLP
SPLP
SPLP
SPLP
SPLP
SPLP
SPLP
SPLP
SPLP
Name and Depth Location Sample Collection Date
BC-18 (1-3')
(East of Cell 1)
10/[8-25]/13
<5
48.8
389.0
<200
1.2
3.06
30.8
0.0701
40,400
35.1
425
<0.2
30.7
0,9810
<10.0
4.79
N/A
<1.0
0.0809
BC-11/12 (44-46')
Divider Dike Cell 2/3
10/[8-25]/13
<5
70.8
52.1
<200
<1.0
<1
<5.0
<0.0050
251
<5
<5
<0.2
<5
0.0665
27.7
4.04
N/A
<0.2
<0.0500
BC-15 (1-3')
Cell 2
10/[8-25]/13
6
20.1
81.6
<200
<1.0
<1
<5.0
0.0074
660
<5
7
<0.2
<5
0.0530
<10.0
5.02
N/A
<0.2
<0.0500
BC-20D (14)
North Portion of Cell 1
10/[8-25]/13
<25
<50.0
<250.0
<1000
<5.0
<1
<25.0
<0.0250
<250
<25
<25
<0.2
<25
0.1490
<50.0
5.12
N/A
<1.0
<0.2500
BC-30D (14)
Cell 2
10/[8-25]/13
<25
51.8
350
<1000
<5.0
3.93
35.0
0.0655
6,780
<25
75
<0.2
30.9
0.1580
<50.0
4.48
N/A
1.1
<0.2500
Tables - Page 3

Table 3 - SPLP Leaching Analytical Results
Notes:
1. TDS = Total dissolved solids
2. Units:
mg/L = milligrams per liter
pg/L = micrograms per liter
3. " IMAC (interim maximum allowable concentration)
4. Sample depth interval in parentheses
5. Standard is for hexavalent chromium (Cr VI). Results shown are for total chromium
6. Highlighted values indicate values that exceed the 15A NCAC 2L Standard
7. Analytical results with "<" preceding the result indicates that the parameter was not detected at a
concentration which attains or exceeds the laboratory reporting limit
Tables - Page 4

Table 4 - Groundwater Analytical Results
Analytical Parameter Depth to Tem DO Cond.
Water p' PH ORP Turbidity Alkalinity Aluminum Antimony Arsenic Barium Beryllium Boron
Units Feet C mg/L pmhos/cm SU my NTU mg/L CaCO3 mg/L HCO3 mg/L CO32- N/A pg/L pg/L pg/L pg/L pg/L
15A NCAC 02L .0202(g) Groundwater Quality Standard NE NE
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection
Date
MW-10D
Compliance
Partially Weathered
3/8/2011
38
MW-10D
Compliance
Partially Weathered
7/5/2011
38
MW-10D
Compliance
Partially Weathered
11/2/2011
38
MW-10D
Compliance
Partially Weathered
3/7/2012
38
MW-10D
Compliance
Partially Weathered
7/3/2012
38
MW-10D
Compliance
Partially Weathered
11/7/2012
38
MW-10D
Compliance
Partially Weathered
3/6/2013
37
MW-10D
Compliance
Partially Weathered
7/8/2013
37
MW-10D
Compliance
Partially Weathered
11/5/2013
37
MW-10D
Compliance
Partially Weathered
3/4/2014
36
MW-10D
Compliance
Partially Weathered
7/1/2014
36
MW-10D
Compliance
Partially Weathered
11/3/2014
37
MW-11D
Compliance
Bedrock
3/7/2011
11
MW-11D
Compliance
Bedrock
7/5/2011
12
MW-11D
Compliance
Bedrock
11/2/2011
12
MW-11D
Compliance
Bedrock
3/7/2012
11
MW-11D
Compliance
Bedrock
7/3/2012
12
MW-11D
Compliance
Bedrock
11/7/2012
12
MW-11D
Compliance
Bedrock
3/7/2013
10
MW-11D
Compliance
Bedrock
7/9/2013
10
MW-11D
Compliance
Bedrock
11/5/2013
12
MW-11D
Compliance
Bedrock
3/4/2014
10
MW-11D
Compliance
Bedrock
7/1/2014
11
MW-11D
Compliance
Bedrock
11/3/2014
13
MW-11S
Compliance
Transition (Saprolite)
3/7/2011
12
MW-11S
Compliance
Transition (Saprolite)
7/5/2011
12
MW-11S
Compliance
Transition (Saprolite)
11/2/2011
12
MW-11S
Compliance
Transition (Saprolite)
3/7/2012
12
MW-11S
Compliance
Transition (Saprolite)
7/3/2012
12
MW-11S
Compliance
Transition (Saprolite)
11/7/2012
13
MW-11S
Compliance
Transition (Saprolite)
3/7/2013
11
MW-11S
Compliance
Transition (Saprolite)
7/9/2013
10
MW-11S
Compliance
Transition (Saprolite)
11/5/2013
12
MW-11S
Compliance
Transition (Saprolite)
3/4/2014
11
MW-11S
Compliance
Transition (Saprolite)
7/1/2014
12
MW-11S
Compliance
Transition (Saprolite)
11/3/2014
13
MW-12D
Compliance
Bedrock
3/8/2011
6.
MW-12D
Compliance
Bedrock
7/5/2011
7.
MW-12D
Compliance
Bedrock
11/2/2011
8.
MW-12D
Compliance
Bedrock
3/7/2012
6.
MW-12D
Compliance
Bedrock
7/3/2012
7.
MW-12D
Compliance
Bedrock
11/7/2012
8.
MW-12D
Compliance
Bedrock
3/7/2013
6.
MW-12D
Compliance
Bedrock
7/9/2013
6.
MW-12D
Compliance
Bedrock
11/4/2013
7.
MW-12D
Compliance
Bedrock
3/4/2014
5.
MW-12D
Compliance
Bedrock
7/1/2014
6.
.15
.37
.74
.19
.30
.35
.81
.44
.24
.93
76
.64
.69
.52
.06
.78
.13
94
.82
.02
.18
96
.74
.33
.07
.92
41
13
.54
.35
20
51
56
.30
.13
.63
51
58
)2
11
19
10
75
57
32
45
39
15.27
17.71
15.22
15.92
16.61
15.38
15.48
16.03
15.43
15.16
16.10
15.38
15.52
16.57
15.32
16.39
16.79
15.29
14.26
17.07
10.04
12.41
18.93
16.07
13.97
16.33
15.80
15.42
16.21
16.10
13.98
16.29
16.35
14.24
16.48
16.85
15.03
16.20
15.29
15.47
15.71
15.47
15.39
15.75
15.61
15.04
15.59
NE NE 6.5 - 8.5
Field
Measurements
WA
763
6.33
VA
738
5.98
'VA
747
6.17
1.67
753
6.12
1.65
756
5.85
1.87
741
5.81
1.75
782
5.52
1.93
793
5.74
?.09
802
5.62
?.08
805
5.53
?.22
799
5.80
?.25
812
5.84
WA
177
5.91
VA
178
5.79
WA
177
5.94
).50
175
6.00
).29
171
5.74
).72
172
6.01
1.81
174
5.76
).36
176
5.70
?.08
185
5.45
).45
170
5.72
).40
175
5.82
).27
175
5.94
V/A
193
6.22
VA
189
6.03
WA
190
6.16
).59
192
6.16
).37
180
5.97
).42
184
6.27
).78
185
5.86
).60
192
5.87
).43
200
5.83
).41
204
5.85
).45
208
5.96
).46
218
6.19
V/A
73
6.23
VA
67
6.17
V/A
69
6.32
i.84
67
6.25
3.69
64
6.06
i.72
66
6.35
5.70
67
5.89
3.67
66
6.01
5.51
66
6.15
3.70
66
6.02
5.77
66
6.07
NE NE NE NE
NE NE
1*
10
700
4*
700
2320B4d N/A
N/A N/A
200.8
200.8
200.7
N/A
200.7
Total
Total
Dissolved Total
Dissolved Total
Dissolved Total
Total
Dissolved Total
N/A
9.50
N/A
N/A
N/A
N/A
1.70
N/A
N/A
N/A
N/A
1.10
N/A
N/A
N/A
380
1.54
N/A
N/A
N/A
327
0.46
N/A
N/A
N/A
453
1.43
<5
N/A
N/A
336
1.79
N/A
N/A
N/A
328
0.79
N/A
N/A
N/A
348
2.88
N/A
N/A
N/A
381
5.96
N/A
N/A
N/A
377
6.84
N/A
N/A
N/A
464
2.60
N/A
N/A
N/A
N/A
12.80
N/A
N/A
N/A
N/A
37.50
N/A
N/A
N/A
N/A
53.30
N/A
N/A
N/A
404
76.80
N/A
N/A
N/A
364
56.20
N/A
N/A
N/A
373
126.00
<5
N/A
N/A
359
277.00
N/A
N/A
N/A
353
202.00
N/A
N/A
N/A
355
123.00
N/A
N/A
N/A
338
33.80
N/A
N/A
N/A
331
313.00
N/A
N/A
N/A
365
36.30
N/A
N/A
N/A
N/A
22.90
N/A
N/A
N/A
N/A
14.30
N/A
N/A
N/A
N/A
7.20
N/A
N/A
N/A
405
2.59
N/A
N/A
N/A
324
4.89
N/A
N/A
N/A
351
3.09
<5
N/A
N/A
345
4.83
N/A
N/A
N/A
338
6.05
N/A
N/A
N/A
328
7.76
N/A
N/A
N/A
317
16.20
N/A
N/A
N/A
310
4.90
N/A
N/A
N/A
337
9.77
N/A
N/A
N/A
N/A
431.00
N/A
N/A
N/A
N/A
63.20
N/A
N/A
N/A
N/A
68.60
N/A
N/A
N/A
401
23.60
N/A
N/A
N/A
362
9.34
N/A
N/A
N/A
361
6.14
<5
N/A
N/A
338
5.87
N/A
N/A
N/A
389
4.52
N/A
N/A
N/A
333
3.89
N/A
N/A
N/A
350
7.40
N/A
N/A
N/A
349
5.23
N/A
N/A
N/A
0
0
0
0
0
0
0
0
0
0
0
A
90
90
60
60
40
20
30
50
70
40
80
A
0
2
1
8
2
3
6
3
6
0
6
A
0
0
0
0
0
0
0
0
0
0
0
Tables - Page 5
N/A
N/A
<1
N/A
<1
N/A
52
N/A
N/A
<5
N/A
N/A
<1
N/A
<1
N/A
50
N/A
N/A
<5
N/A
N/A
<1
N/A
<1
N/A
45
N/A
N/A
<5
N/A
N/A
<1
N/A
<1
N/A
42
N/A
N/A
<5
N/A
N/A
<1
N/A
<1
N/A
43
N/A
N/A
<5
N/A
N/A
<1
N/A
<1
N/A
46
N/A
N/A
<5
N/A
N/A
<1
N/A
<1
N/A
40
N/A
N/A
<5
N/A
<1
<1
<1
<1
39
40
N/A
<50
<5
N/A
N/A
<1
N/A
<1
N/A
39
N/A
N/A
<5
N/A
N/A
<1
N/A
<1
N/A
47
N/A
N/A
<5
N/A
N/A
<1
N/A
<1
N/A
36
N/A
N/A
<5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/
N/A
N/A
<1
N/A
<1
N/A
32
N/A
N/A
11
N/A
N/A
<1
N/A
<1
N/A
45
N/A
N/A
12
N/A
N/A
<1
N/A
<1
N/A
48
N/A
N/A
12
N/A
N/A
<1
N/A
<1
N/A
61
N/A
N/A
11
N/A
N/A
<1
N/A
<1
N/A
47
N/A
N/A
12
N/A
N/A
<1
N/A
<1
N/A
52
N/A
N/A
12
N/A
N/A
<1
N/A
<1
N/A
78
N/A
N/A
11
N/A
<1
<1
<1
<1
28
89
N/A
1260
12
N/A
N/A
<1
N/A
<1
N/A
59
N/A
N/A
12
N/A
N/A
<1
N/A
<1
N/A
51
N/A
N/A
12
N/A
N/A
<1
N/A
1.2
N/A
166
N/A
N/A
12
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/
N/A
N/A
<1
N/A
<1
N/A
13
N/A
N/A
44
N/A
N/A
<1
N/A
<1
N/A
8
N/A
N/A
47
N/A
N/A
<1
N/A
<1
N/A
8
N/A
N/A
48
N/A
N/A
<1
N/A
<1
N/A
7
N/A
N/A
43
N/A
N/A
<1
N/A
<1
N/A
9
N/A
N/A
44
N/A
N/A
<1
N/A
<1
N/A
7
N/A
N/A
45
N/A
N/A
<1
N/A
<1
N/A
7
N/A
N/A
41
N/A
<1
<1
<1
<1
7
8
N/A
449
45
N/A
N/A
<1
N/A
<1
N/A
8
N/A
N/A
44
N/A
N/A
<1
N/A
<1
N/A
13
N/A
N/A
44
N/A
N/A
<1
N/A
<1
N/A
7
N/A
N/A
44
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/
N/A
N/A
<1
N/A
<1
N/A
74
N/A
N/A
<5
N/A
N/A
<1
N/A
<1
N/A
55
N/A
N/A
<5
N/A
N/A
<1
N/A
<1
N/A
46
N/A
N/A
<5
N/A
N/A
<1
N/A
<1
N/A
28
N/A
N/A
<5
N/A
N/A
<1
N/A
<1
N/A
20
N/A
N/A
<5
N/A
N/A
<1
N/A
<1
N/A
19
N/A
N/A
<5
N/A
N/A
<1
N/A
<1
N/A
14
N/A
N/A
<5
N/A
<1
<1
<1
<1
11
26
N/A
<50
<5
N/A
N/A
<1
N/A
<1
N/A
16
N/A
N/A
<5
N/A
N/A
<1
N/A
<1
N/A
31
N/A
N/A
<5
N/A
N/A
<1
N/A
<1
N/A
16
N/A
N/A
<5

Table 4 - Groundwater Analytical Results
Well Name
OW-12D
OW-12S
OW-12S
OW-12S
OW-12S
OW-12S
OW-12S
OW-12S
OW-12S
OW-12S
OW-12S
OW-12S
OW-12S
OW-13D
OW-13D
OW-13D
OW-13D
OW-13D
OW-13D
OW-13D
OW-13D
OW-13D
OW-13D
OW-13D
OW-13D
OW-1 D
OW-1 D
OW-1 D
OW-1 D
OW-1 D
OW-1 D
OW-1 D
OW-1 D
OW-1 D
ow -is
ow -is
ow -is
ow -is
ow -is
ow -is
ow -is
ow -is
ow -is
ow -is
ow -is
ow -is
ow -is
Analytical Parameter Depth to Tem DO Cond.
Water p' PH ORP Turbidity Alkalinity Aluminum
Units Feet C mg/L pmhos/cm SU my NTU mg/L CaCO3 mg/L HCO3 mg/L C032-
15A NCAC 02L .0202(g) Groundwater Quality Standard NE
Analytical Method
Well Type
Hydrostratigraphic Unit
Compliance
Bedrock
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Date
11 /3/2014
3/8/2011
7/5/2011
11 /2/2011
3/7/2012
7/3/2012
11 /7/2012
3/7/2013
7/9/2013
11 /4/2013
3/4/2014
7/1 /2014
11 /3/2014
3/8/2011
7/5/2011
11 /2/2011
3/7/2012
7/3/2012
11 /7/2012
3/6/2013
7/8/2013
11 /4/2013
3/3/2014
7/1 /2014
11 /3/2014
11 /15/2006
5/15/2007
11 /19/2007
5/21 /2008
11 /24/2008
5/12/2009
11 /2/2009
5/25/2010
11 /4/2013
11 /15/2006
5/15/2007
11 /19/2007
5/21 /2008
11 /24/2008
11 /25/2008
5/12/2009
11 /2/2009
5/25/2010
3/8/2011
7/5/2011
11 /2/2011
11 /4/2013
NE NE
7.69
15.43
6.71
6.58
13.80
N/A
7.79
15.81
N/A
8.15
15.99
N/A
6.15
14.80
4.18
7.29
16.22
4.55
8.22
16.25
3.97
6.83
12.26
3.58
6.64
16.30
3.53
7.11
16.36
3.28
5.50
12.04
5.14
6.14
15.13
5.38
7.72
16.07
4.98
12.90
14.58
N/A
14.08
16.23
N/A
15.29
15.17
N/A
12.70
15.63
4.44
13.53
15.45
3.79
15.00
15.24
3.84
13.45
14.09
5.00
12.68
16.67
4.05
14.16
14.70
4.98
12.08
11.36
4.84
11.38
15.03
3.75
14.41
14.85
3.95
N/A
15.39
N/A
N/A
18.49
N/A
N/A
17.49
N/A
N/A
16.21
N/A
N/A
15.10
N/A
N/A
16.90
N/A
N/A
16.04
N/A
1.80
16.49
N/A
4.03
N/A
N/A
N/A
16.95
N/A
N/A
16.00
N/A
N/A
17.66
N/A
N/A
15.60
N/A
N/A
15.60
N/A
N/A
N/A
N/A
N/A
17.05
N/A
N/A
17.70
N/A
2.29
17.10
N/A
3.00
N/A
N/A
3.62
N/A
N/A
3.22
N/A
N/A
4A2
N/A
N/A
NE 6.5 - 8.5 NE NE
Field Measurements
66
6.23
363
3.87
116
6.12
N/A
13.40
92
6.02
N/A
9.00
95
6.30
N/A
9.50
86
6.21
397
8.01
75
5.97
367
2.50
78
6.24
335
2.56
91
5.85
351
8.14
79
5.85
362
7.76
80
5.96
327
13.20
73
5.86
351
7.11
71
5.94
346
9.75
72
6.12
353
13.80
154
6.21
N/A
12.90
156
6.23
N/A
17.70
146
6.35
N/A
7.30
140
6.38
411
9.90
148
6.15
425
1.63
143
6.33
360
1.37
138
6.14
349
9.80
147
6.20
301
9.47
152
6.25
316
4.90
141
6.15
343
27.20
160
6.17
330
9.17
161
6.30
371
4.10
406
7.27
N/A
17.80
415
6.83
N/A
1.93
418
6.81
N/A
3.75
415
6.88
N/A
1.61
415
6.95
N/A
1.80
405
6.93
N/A
0.89
399
6.68
N/A
2.98
388
6.83
N/A
1.66
N/A
N/A
N/A
N/A
409
7.30
N/A
95.80
400
6.77
N/A
326.00
418
6.87
N/A
146.00
402
6.81
N/A
236.00
406
6.92
N/A
104.00
N/A
N/A
N/A
N/A
355
6.88
N/A
50.50
367
6.70
N/A
45.40
355
6.88
N/A
100.00
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
NE NE NE
2320B4d N/A N/A
N/A
N/A
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Total
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
NE
N/A
Total
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Antimony Arsenic Barium Beryllium Boron
Ng/L pg/L pg/L pg/L pg/L
1* 10 700 4* 700
200.8
200.8
200.7
N/A
200.7
Dissolved
Total
Dissolved
Total
Dissolved
Total
Dissolved
Total
Total
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
25
N/A
N/A
<50
N/A
<1
N/A
<1
N/A
21
N/A
N/A
<50
N/A
<1
N/A
<1
N/A
19
N/A
N/A
<50
N/A
<1
N/A
<1
N/A
17
N/A
N/A
<50
N/A
<1
N/A
<1
N/A
17
N/A
N/A
<50
N/A
<1
N/A
<1
N/A
17
N/A
N/A
<50
N/A
<1
N/A
<1
N/A
17
N/A
N/A
<50
<1
<1
<1
<1
16
18
N/A
<50
<50
N/A
<1
N/A
<1
N/A
19
N/A
N/A
<50
N/A
<1
N/A
<1
N/A
16
N/A
N/A
<50
N/A
<1
N/A
<1
N/A
16
N/A
N/A
<50
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
44
N/A
N/A
<50
N/A
<1
N/A
<1
N/A
48
N/A
N/A
<50
N/A
<1
N/A
<1
N/A
42
N/A
N/A
<50
N/A
<1
N/A
<1
N/A
41
N/A
N/A
<50
N/A
<1
N/A
<1
N/A
45
N/A
N/A
<50
N/A
<1
N/A
<1
N/A
43
N/A
N/A
<50
N/A
<1
N/A
<1
N/A
40
N/A
N/A
<50
<1
<1
<1
<1
43
46
N/A
<50
<50
N/A
<1
N/A
<1
N/A
45
N/A
N/A
<50
N/A
<1
N/A
<1
N/A
48
N/A
N/A
<50
N/A
<1
N/A
<1
N/A
50
N/A
N/A
<50
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
31
N/A
N/A
280
N/A
N/A
N/A
<2
N/A
36
N/A
N/A
373
N/A
N/A
N/A
<2
N/A
27
N/A
N/A
466
N/A
N/A
N/A
<2
N/A
27
N/A
N/A
506
N/A
N/A
N/A
<2
N/A
23
N/A
N/A
593
N/A
N/A
N/A
<1
N/A
25
N/A
N/A
388
N/A
N/A
N/A
<1
N/A
22.8
N/A
N/A
442
N/A
N/A
N/A
<1
N/A
18.3
N/A
N/A
304
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
67
N/A
N/A
302
N/A
N/A
N/A
<2
N/A
69
N/A
N/A
322
N/A
N/A
N/A
<2
N/A
50
N/A
N/A
428
N/A
N/A
N/A
<2
N/A
59
N/A
N/A
465
N/A
N/A
N/A
<2
N/A
48
N/A
N/A
516
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
41
N/A
N/A
279
N/A
N/A
N/A
<1
N/A
35
N/A
N/A
254
N/A
N/A
N/A
<1
N/A
38.1
N/A
N/A
97.6
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Tables - Page 6

Table 4 - Groundwater Analytical Results
Well Name
OW-2D
OW-2D
OW-2D
OW-2D
OW-2S
OW-2S
OW-2S
v1W-2S
v1W-3D
OW-3D
v1W-3D
v1W-3D
OW-3D
OW-3D
v1W-3D
v1W-3D
v1W-3D
OW-3S
OW-3S
v1W-3S
v1W-3S
v1W-3S
v1W-3S
OW-3S
v1W-3S
OW-3S
v1W-3S
v1W-3S
OW-3S
OW-4D
v1W-4D
v1W-4D
v1W-4D
v1W-4D
OW-4D
v1W-4D
OW-4D
v1W-4D
v1W-4S
v1W-4S
OW-4S
v1W-4S
v1W-4S
v1W-4S
v1W-4S
OW-4S
OW-4S
Analytical Parameter Depth to Tem DO Cond.
Water p' PH ORP Turbidity Alkalinity Aluminum Antimony Arsenic Barium Beryllium Boron
Units Feet C mg/L pmhos/cm SU my NTU mg/L CaCO3 mg/L HCO3 mg/L C032- N/A pg/L pg/L pg/L pg/L pg/L
15A NCAC 02L .0202(g) Groundwater Quality Standard NE
Analytical Method
Well Type
Hydrostratigraphic Unit
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Sample Collection
Date
11 /15/2006
5/16/2007
11 /19/2007
5/21 /2008
11 /15/2006
5/16/2007
11 /19/2007
5/21 /2008
11 /15/2006
5/15/2007
11 /19/2007
5/21 /2008
11 /24/2008
5/12/2009
11 /2/2009
5/25/2010
11 /4/2013
11 /15/2006
5/15/2007
11 /19/2007
5/21 /2008
11 /24/2008
5/12/2009
11 /2/2009
5/25/2010
3/7/2011
7/5/2011
11 /2/2011
11 /4/2013
11 /14/2006
5/15/2007
11 /19/2007
5/21 /2008
11 /24/2008
5/12/2009
11 /2/2009
5/25/2010
11 /4/2013
11 /14/2006
5/15/2007
11 /19/2007
5/21 /2008
11 /24/2008
5/12/2009
11 /2/2009
5/25/2010
3/7/2011
NE NE
N/A
14.89
N/A
N/A
15.85
N/A
N/A
14.99
N/A
N/A
15.41
N/A
N/A
15.00
N/A
N/A
15.60
N/A
N/A
14.65
N/A
N/A
15.60
N/A
N/A
15.45
N/A
N/A
16.11
N/A
N/A
15.82
N/A
N/A
16.21
N/A
N/A
15.07
N/A
N/A
16.62
N/A
N/A
16.40
N/A
2.91
16.88
N/A
4.73
N/A
N/A
N/A
16.34
N/A
N/A
14.63
N/A
N/A
17.04
N/A
N/A
15.03
N/A
N/A
15.92
N/A
N/A
15.27
N/A
N/A
17.86
N/A
2.50
16.05
N/A
3.46
N/A
N/A
4.55
N/A
N/A
4.05
N/A
N/A
4.08
N/A
N/A
N/A
16.64
N/A
N/A
16.97
N/A
N/A
17.04
N/A
N/A
15.96
N/A
N/A
15.21
N/A
N/A
15.70
N/A
N/A
16.15
N/A
10.91
16.36
N/A
11.73
N/A
N/A
N/A
17.56
N/A
N/A
16.94
N/A
N/A
18.02
N/A
N/A
15.48
N/A
N/A
15.27
N/A
N/A
15.11
N/A
N/A
16.94
N/A
7.72
15.93
N/A
8.02
N/A
N/A
NE 6.5 - 8.5
Field Measurements
199 6.60
188 6.12
227 6.21
219 6.22
250 6.02
254 5.47
263 5.88
248 5.62
377 6.14
368 6.12
367 5.99
358 6.12
343 6.28
339 6.27
334 6.15
324 6.10
N/A N/A
223 5.49
230 5.40
222 5.37
215 5.45
199 5.66
199 5.63
198 5.54
197 5.50
N/A N/A
N/A N/A
N/A N/A
N/A N/A
200 6.15
196 6.03
194 5.93
199 5.93
188 6.14
196 6.09
194 6.06
195 6.00
N/A N/A
190 6.27
182 6.16
184 6.09
187 6.10
181 6.22
184 6.23
190 6.15
189 6.09
N/A N/A
NE
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
NE
887.00
105.00
4.23
3.92
3.83
7.44
22.20
6.23
12.70
2.49
1.82
4.13
1.16
1.51
2.68
1.05
N/A
13.90
6.59
7.70
21.40
24.00
20.60
7.54
8.59
N/A
N/A
N/A
N/A
10.90
0.52
1.16
6.22
1.08
2.18
2.78
0.81
N/A
16.40
39.80
18.40
140.00
9.76
158.00
74.30
14.70
N/A
NE
2320B4d
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
NE
NE
NE
1*
10
700
4*
N/A
Total
700
200.7
Dissolved
Total
N/A
NIA
N/A
Total
200.8
Dissolved
200.8
200.7
Total
Total
Dissolved
Total
Dissolved
Total
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
200
N/A
N/A
<100
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
89
N/A
N/A
<100
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
80
N/A
N/A
<60
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
76
N/A
N/A
<100
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
134
N/A
N/A
440
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
128
N/A
N/A
463
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
127
N/A
N/A
449
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
125
N/A
N/A
487
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
109
N/A
N/A
934
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
97
N/A
N/A
919
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
98
N/A
N/A
866
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
98
N/A
N/A
881
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
88
N/A
N/A
805
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
91
N/A
N/A
780
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
83
N/A
N/A
817
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
80.7
N/A
N/A
732
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
35
N/A
N/A
1309
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
30
N/A
N/A
1208
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
31
N/A
N/A
1260
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
27
N/A
N/A
1210
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
30
N/A
N/A
1180
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
28
N/A
N/A
1130
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
22.7
N/A
N/A
1260
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
22.9
N/A
N/A
1110
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
20
N/A
N/A
434
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
15
N/A
N/A
455
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
18
N/A
N/A
461
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
18
N/A
N/A
489
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
17
N/A
N/A
478
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
19
N/A
N/A
502
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
16.3
N/A
N/A
533
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
17.1
N/A
N/A
528
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
32
N/A
N/A
483
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
30
N/A
N/A
487
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
35
N/A
N/A
466
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
73
N/A
N/A
481
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
32
N/A
N/A
456
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
100
N/A
N/A
494
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
43.8
N/A
N/A
505
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
37.9
N/A
N/A
499
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Tables - Page 7

Table 4 - Groundwater Analytical Results
Well Name
OW-4S
OW-4S
OW-4S
OW-5D
OW-5D
OW-5D
OW-5D
OW-5D
OW-5D
OW-5D
v1W-5D
v1W-5D
OW-5S
OW-5S
v1W-5S
OW-5S
OW-5S
OW-5S
OW-5S
OW-5S
OW-5S
OW-5S
OW-5S
OW-5S
OW-6D
OW-6D
OW-6D
OW-6D
OW-6D
OW-6D
OW-6D
OW-6D
OW-6D
OW-6D
OW-6D
OW-6D
OW-6D
OW-6D
v1W-6D
OW-6D
OW-6D
OW-6D
OW-6D
OW-6D
OW-6S
OW-6S
OW-6S
Analytical Parameter Depth to Tem DO Cond.
Water p' PH ORP Turbidity Alkalinity Aluminum Antimony Arsenic Barium Beryllium
Units Feet C mg/L pmhos/cm SU my NTU mg/L CaCO3 mg/L HCO3 mg/L C032- N/A pg/L pg/L pg/L pg/L
15A NCAC 02L .0202(g) Groundwater Quality Standard NE
Analytical Method
Well Type
Hydrostratigraphic Unit
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Sample Collection
Date
7/5/2011
11 /2/2011
11 /4/2013
11 /15/2006
5/16/2007
11 /20/2007
5/21 /2008
11 /24/2008
5/12/2009
11 /2/2009
5/25/2010
11 /4/2013
11 /15/2006
5/16/2007
11 /20/2007
5/21 /2008
11 /24/2008
5/12/2009
11 /2/2009
5/25/2010
3/8/2011
7/5/2011
11 /2/2011
11 /4/2013
11 /14/2006
5/15/2007
11 /20/2007
5/21 /2008
11 /24/2008
5/12/2009
11 /2/2009
5/25/2010
3/7/2011
7/5/2011
11 /2/2011
3/7/2012
7/3/2012
11 /7/2012
3/6/2013
7/8/2013
11 /4/2013
3/3/2014
7/1 /2014
11/3/2014
11 /14/2006
5/15/2007
11 /20/2007
NE NE
8.56
N/A
N/A
8.01
N/A
N/A
8.21
N/A
N/A
N/A
15.98
N/A
N/A
16.36
N/A
N/A
15.59
N/A
N/A
16.92
N/A
N/A
15.86
N/A
N/A
16.11
N/A
N/A
16.32
N/A
18.56
17.13
N/A
20.87
N/A
N/A
N/A
15.88
N/A
N/A
16.13
N/A
N/A
15.44
N/A
N/A
16.97
N/A
N/A
15.82
N/A
N/A
15.93
N/A
N/A
16.35
N/A
18.53
16.90
N/A
20.79
N/A
N/A
21.62
N/A
N/A
20.53
N/A
N/A
20.84
N/A
N/A
N/A
15.86
N/A
N/A
16.32
N/A
N/A
14.27
N/A
N/A
16.14
N/A
N/A
14.05
N/A
N/A
15.15
N/A
N/A
15.01
N/A
18.21
15.93
N/A
19.90
15.21
N/A
20.20
16.48
N/A
20.88
14.32
N/A
19.06
15.32
2.45
19.88
15.99
2.39
20.77
14.99
2.29
19.31
14.50
2.36
18.91
16.32
2.40
22.31
14.85
1.95
20.63
14.97
2.12
21.78
16.43
1.91
24.04
15.16
2.11
N/A
15.37
N/A
N/A
14.69
N/A
N/A
14.13
N/A
NE 6.5 - 8.5
Field Measurements
N/A N/A
N/A N/A
N/A N/A
196 6.04
193 6.12
190 6.13
189 6.02
180 6.13
191 6.08
191 6.00
195 5.96
N/A N/A
149 5.80
144 5.84
157 5.81
158 5.77
157 5.90
160 5.88
157 5.82
153 5.75
N/A N/A
N/A N/A
N/A N/A
N/A N/A
73 7.05
74 6.94
83 6.98
90 6.90
94 6.80
112 6.84
112 6.67
125 6.73
123 6.98
127 6.63
125 6.83
133 6.80
133 5.83
133 6.69
138 6.58
144 6.55
146 6.60
144 6.58
150 6.69
145 6.67
43 5.76
39 5.28
42 5.48
NE
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
365
334
393
315
230
291
273
449
479
N/A
N/A
N/A
NE
N/A
N/A
N/A
7.75
0.64
1.24
5.54
0.69
1.97
3.44
1.56
N/A
16.40
7.99
18.10
10.90
4.18
8.24
19.00
7.80
N/A
N/A
N/A
N/A
24.50
8.15
1.39
1.08
0.63
0.32
2.58
0.67
2.00
0.90
0.50
0.94
0.50
0.54
2.86
1.98
2.82
1.35
2.35
1.24
71.80
4.79
37.80
NE
2320B4d
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
NE NE NE 1* 10 700 4*
N/A NIA N/A 200.8 200.8 200.7 N/A
Total
Total
Dissolved
Total
Dissolved
Total
Dissolved
Total
Total
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
24
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
19
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
22
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
20
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
20
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
22
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
20.1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
20.8
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
34
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
28
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
49
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
37
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
37
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
37
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
39.9
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
32
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
40
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
36
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
44
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
45
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
51
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
60
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
57
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
60.7
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
63
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
64
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
62
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
65
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
70
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
70
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
73
N/A
N/A
N/A
N/A
<1
<1
<1
<1
81
84
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
81
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
83
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
86
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
47
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
23
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
39
N/A
Boron
pg/L
700
200.7
Dissolved
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<50
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Total
N/A
N/A
N/A
388
384
363
372
340
349
369
342
N/A
230
259
242
243
213
202
210
222
N/A
N/A
N/A
N/A
<100
<100
<60
<100
<100
<100
<50
<50
<50
<50
<50
<50
<50
<50
<50
<50
<50
<50
<50
N/A
<100
<100
<60
Tables - Page 8

Table 4 - Groundwater Analytical Results
Well Name
v1W-6S
v1W-6S
v1W-6S
v1W-6S
v1W-6S
v1W-6S
v1W-6S
OW-6S
v1W-6S
v1W-6S
v1W-6S
OW-6S
v1W-6S
v1W-6S
v1W-6S
OW-6S
v1W-6S
v1W-7D
v1W-7D
v1W-7D
v1W-7D
v1W-7D
v1W-7D
OW-7D
v1W-7D
v1W-7D
v1W-7D
v1W-7D
v1W-7D
v1W-7S
v1W-7S
v1W-7S
v1W-7S
v1W-7S
v1W-7S
v1W-7S
v1W-7S
v1W-7S
v1W-7S
OW-7S
v1W-7S
v1W-8D
v1W-8D
v1W-8D
v1W-8D
v1W-8D
v1W-8D
Analytical Parameter Depth to Tem DO Cond.
Water p' PH ORP Turbidity Alkalinity Aluminum Antimony Arsenic Barium Beryllium Boron
Units Feet C mg/L pmhos/cm SU my NTU mg/L CaCO3 mg/L HCO3 mg/L C032- N/A pg/L pg/L pg/L pg/L
15A NCAC 02L .0202(g) Groundwater Quality Standard NE
Analytical Method
Well Type Hydrostratigraphic Unit
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Bedrock
Compliance Bedrock
Compliance Bedrock
Compliance Bedrock
Compliance Bedrock
Compliance Bedrock
Compliance Bedrock
Compliance Bedrock
Compliance Bedrock
Compliance Bedrock
Compliance Bedrock
Compliance Bedrock
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Partially Weathered
Compliance Partially Weathered
Compliance Partially Weathered
Compliance Partially Weathered
Compliance Partially Weathered
Compliance Partially Weathered
Sample Collection
Date
5/21 /2008
11 /24/2008
5/12/2009
11 /2/2009
5/25/2010
3/7/2011
7/5/2011
11 /2/2011
3/7/2012
7/3/2012
11 /7/2012
3/6/2013
7/8/2013
11 /4/2013
3/3/2014
7/1 /2014
11/3/2014
3/8/2011
7/5/2011
11 /2/2011
3/7/2012
7/3/2012
11 /7/2012
3/6/2013
7/8/2013
11 /4/2013
3/3/2014
7/1 /2014
11 /3/2014
3/8/2011
7/5/2011
11 /2/2011
3/7/2012
7/3/2012
11 /7/2012
3/6/2013
7/8/2013
11 /4/2013
3/3/2014
7/1 /2014
11 /3/2014
3/7/2011
7/5/2011
11 /2/2011
3/7/2012
7/3/2012
11 /7/2012
NE NE
N/A
15.88
N/A
N/A
13.56
N/A
N/A
14.48
N/A
N/A
14.64
N/A
17.62
15.60
N/A
20.44
15.60
N/A
21.26
15.87
N/A
21.92
14.46
N/A
18.86
15.65
0.43
20.55
16.27
0.43
21.87
14.58
0.12
19.45
15.09
0.56
18.81
16.24
0.20
22.18
14.97
0.10
19.24
15.38
1.24
20.86
15.79
0.69
24.42
14.82
1.44
6.32
14.80
N/A
6.69
17.00
N/A
7.10
15.17
N/A
6.40
14.95
1.56
6.62
15.71
1.94
6.60
15.22
2.09
6.09
14.06
1.61
6.34
16.26
0.88
9.50
15.71
2.22
8.55
14.80
0.59
9.78
15.79
1.91
10.77
15.16
1.59
5.71
13.21
N/A
7.39
15.84
N/A
7.11
15.78
N/A
5.85
14.35
2.48
7.21
16.24
2.02
6.87
15.98
1.54
5.50
14.88
1.98
5.95
15.81
1.48
9.96
16.42
1.38
7.38
14.51
1.82
10.08
15.27
1.19
11.66
15.76
1.08
3.62
14.92
N/A
7.11
17.95
N/A
7.47
16.12
N/A
3.17
14.61
4.09
6.25
15.64
4.14
7.47
15.39
4.16
NE 6.5 - 8.5
Field Measurements
43 5.42
36 5.29
42 5.40
40 5.32
51 5.30
43 5.54
48 5.09
46 5.41
53 5.26
52 4.48
48 5.24
52 5.13
54 5.07
50 5.19
49 5.12
45 5.23
46 5.27
248 7.16
184 6.90
168 7.19
155 6.85
161 6.88
158 6.82
131 6.42
148 6.52
152 6.76
151 6.30
137 6.34
145 6.52
106 6.18
102 5.88
102 6.18
100 5.82
100 5.93
101 5.86
98 5.78
95 5.80
99 5.84
97 5.76
106 5.76
102 5.83
139 6.43
129 6.33
128 6.30
128 6.52
126 6.36
126 6.33
NE
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
408
362
432
378
273
354
364
483
523
N/A
N/A
N/A
283
316
403
323
147
300
270
340
372
N/A
N/A
N/A
416
371
428
359
260
319
318
420
386
N/A
N/A
N/A
366
334
347
NE NE
2320B4d
64.90
78.00
59.60
14.50
11.90
8.10
7.50
4.00
1.63
5.21
4.26
2.04
4.24
3.32
1.36
5.29
8.43
8.50
7.00
9.60
9.30
9.66
14.30
7.17
4.54
3.96
3.15
3.09
3.16
4.80
8.30
3.60
2.12
1.46
1.04
1.99
1.14
2.43
1.37
1.99
2.40
11.00
16.00
6.20
3.55
4.48
2.59
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<5
NE NE NE 1* 10 700 4*
N/A
NIA
N/A
Total
200.8
Dissolved
200.8
200.7
N/A
Total
Total
Total
Dissolved
Total
Dissolved
Total
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
43
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
40
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
39
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
32.9
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
32.9
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
36
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
40
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
36
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
39
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
39
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
40
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
39
N/A
N/A
N/A
N/A
<1
<1
<1
<1
41
41
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
39
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
41
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
38
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
12
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
15
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
13
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
14
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
13
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
19
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
10
N/A
N/A
N/A
N/A
<1
<1
<1
<1
12
14
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
13
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
14
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
13
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
23
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
23
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
24
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
21
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
22
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
25
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
20
N/A
N/A
N/A
N/A
<1
<1
<1
<1
24
24
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
23
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
24
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
27
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
19
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
18
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
17
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
16
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
17
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
17
N/A
pg/L
700
200.7
Dissolved
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<50
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<50
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<50
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Total
<100
<100
<100
<50
<50
<50
<50
<50
<50
<50
<50
<50
<50
<50
<50
<50
N/A
<50
<50
<50
<50
<50
<50
<50
<50
<50
<50
<50
N/A
<50
<50
<50
<50
<50
<50
<50
<50
<50
<50
<50
N/A
<50
<50
<50
<50
<50
<50
T�
ibles - Page 9

Table 4 - Groundwater Analytical Results
Analytical Parameter Depth to Tem DO Cond.
Water p' PH ORP Turbidity Alkalinity Aluminum Antimony
Units Feet C mg/L pmhos/cm SU my NTU mg/L CaCO3 mg/L HCO3 mg/L C032- N/A pg/L
15A NCAC 02L .0202(g) Groundwater Quality Standard NE NE NE
Analytical Method
Well Name
Well Type
Hydrostratigraphic Unit
v1W-81D
Compliance
Partially Weathered
v1W-81D
Compliance
Partially Weathered
v1W-81D
Compliance
Partially Weathered
v1W-81D
Compliance
Partially Weathered
v1W-81D
Compliance
Partially Weathered
v1W-81D
Compliance
Partially Weathered
OW-8S
Compliance
Transition (Saprolite)
OW-8S
Compliance
Transition (Saprolite)
OW-8S
Compliance
Transition (Saprolite)
OW-8S
Compliance
Transition (Saprolite)
OW-8S
Compliance
Transition (Saprolite)
OW-8S
Compliance
Transition (Saprolite)
OW-8S
Compliance
Transition (Saprolite)
OW-8S
Compliance
Transition (Saprolite)
OW-8S
Compliance
Transition (Saprolite)
OW-8S
Compliance
Transition (Saprolite)
OW-8S
Compliance
Transition (Saprolite)
OW-8S
Compliance
Transition (Saprolite)
v1W-91D
Compliance
Bedrock
v1W-91D
Compliance
Bedrock
v1W-91D
Compliance
Bedrock
v1W-91D
Compliance
Bedrock
v1W-9D
Compliance
Bedrock
v1W-91D
Compliance
Bedrock
v1W-91D
Compliance
Bedrock
v1W-91D
Compliance
Bedrock
v1W-91D
Compliance
Bedrock
v1W-91D
Compliance
Bedrock
v1W-91D
Compliance
Bedrock
v1W-91D
Compliance
Bedrock
OW-9S
Compliance
Transition (Saprolite)
OW-9S
Compliance
Transition (Saprolite)
OW-9S
Compliance
Transition (Saprolite)
OW-9S
Compliance
Transition (Saprolite)
OW-9S
Compliance
Transition (Saprolite)
v1W-9S
Compliance
Transition (Saprolite)
OW-9S
Compliance
Transition (Saprolite)
NW-9S
Compliance
Transition (Saprolite)
OW-9S
Compliance
Transition (Saprolite)
OW-9S
Compliance
Transition (Saprolite)
OW-9S
Compliance
Transition (Saprolite)
v1W-9S
Compliance
Transition (Saprolite)
Sample Collection
Date
3/6/2013
7/8/2013
11 /4/2013
3/3/2014
7/1 /2014
11 /3/2014
3/7/2011
7/5/2011
11 /2/2011
3/7/2012
7/3/2012
11 /7/2012
3/6/2013
7/8/2013
11 /4/2013
3/3/2014
7/1 /2014
11 /3/2014
3/7/2011
7/5/2011
11 /2/2011
3/7/2012
7/3/2012
11 /7/2012
3/7/2013
7/9/2013
11 /5/2013
3/4/2014
7/1 /2014
11/3/2014
3/7/2011
7/5/2011
11 /2/2011
3/7/2012
7/3/2012
11 /7/2012
3/7/2013
7/9/2013
11 /5/2013
3/4/2014
7/1 /2014
11 /3/2014
3.53
12.70
5.02
3.38
16.74
4.08
6.57
14.59
4.20
2.64
13.68
4.48
4.98
16.09
4.59
7.32
14.96
4.28
3.94
13.85
N/A
7.90
17.21
N/A
8.18
17.53
N/A
3.66
13.99
1.15
7.10
16.50
1.31
8.19
16.72
1.70
3.91
10.46
4.36
3.89
20.17
3.82
7.46
10.91
4.63
3.23
11.33
3.76
5.91
15.18
3.18
8.20
15.51
3.81
6.52
14.94
N/A
7.57
18.61
N/A
7.02
16.77
N/A
6.78
16.23
2.01
7.51
17.00
1.87
7.26
16.13
2.08
6.71
15.64
1.91
6.79
16.38
1.96
7.22
16.10
1.91
6.68
15.58
2.01
7.47
16.11
1.90
7.25
16.04
1.78
5.56
13.00
N/A
7.11
18.99
N/A
6.34
19.67
N/A
6.12
14.33
1.92
7.10
18.36
3.86
6.65
17.89
1.90
5.98
12.58
4.99
6.08
18.27
1.13
6.68
17.74
3.67
5.98
12.11
3.80
7.17
17.01
3.68
6.74
18.05
3.84
NE 6.5 - 8.5 NE NE NE NE NE NE
2320B4d
N/A
N/A
N/A
Field Measurements
i
Total
Total
127
6.17
339
4.77
N/A
N/A
N/A
N/A
128
6.21
322
3.87
N/A
N/A
N/A
N/A
127
6.32
315
4.78
N/A
N/A
N/A
N/A
131
6.19
338
8.03
N/A
N/A
N/A
N/A
127
6.16
338
11.00
N/A
N/A
N/A
N/A
130
6.38
380
4.78
N/A
N/A
N/A
N/A
214
6.05
N/A
27.20
N/A
N/A
N/A
N/A
128
6.13
N/A
47.10
N/A
N/A
N/A
N/A
154
6.11
N/A
6.60
N/A
N/A
N/A
N/A
204
6.25
359
70.30
N/A
N/A
N/A
N/A
164
6.19
334
4.48
N/A
N/A
N/A
N/A
160
6.25
355
2.04
<5
N/A
N/A
N/A
180
6.01
350
15.30
N/A
N/A
N/A
N/A
152
6.19
311
19.50
N/A
N/A
N/A
N/A
142
6.25
318
48.20
N/A
N/A
N/A
N/A
140
6.03
347
86.50
N/A
N/A
N/A
N/A
148
6.04
346
16.90
N/A
N/A
N/A
N/A
143
6.29
389
11.40
N/A
N/A
N/A
N/A
187
6.46
N/A
15.00
N/A
N/A
N/A
N/A
182
6.23
N/A
2.20
N/A
N/A
N/A
N/A
183
6.48
N/A
2.10
N/A
N/A
N/A
N/A
186
6.46
398
3.04
N/A
N/A
N/A
N/A
183
5.22
368
1.76
N/A
N/A
N/A
N/A
185
6.19
467
3.11
<5
N/A
N/A
N/A
193
6.10
346
1.58
N/A
N/A
N/A
N/A
198
6.14
356
1.12
N/A
N/A
N/A
N/A
203
6.13
324
4.14
N/A
N/A
N/A
N/A
213
5.93
345
2.04
N/A
N/A
N/A
N/A
218
6.23
509
2.22
N/A
N/A
N/A
N/A
227
6.23
537
1.59
N/A
N/A
N/A
N/A
171
6.54
N/A
30.60
N/A
N/A
N/A
N/A
177
6.25
N/A
9.90
N/A
N/A
N/A
N/A
175
6.62
N/A
9.30
N/A
N/A
N/A
N/A
179
6.47
406
3.01
N/A
N/A
N/A
N/A
184
5.32
365
9.86
N/A
N/A
N/A
N/A
190
6.11
476
6.03
<5
N/A
N/A
N/A
194
6.03
348
7.93
N/A
N/A
N/A
N/A
209
6.04
356
0.91
N/A
N/A
N/A
N/A
218
6.10
329
6.23
N/A
N/A
N/A
N/A
218
5.78
348
8.26
N/A
N/A
N/A
N/A
226
6.23
516
3.82
N/A
N/A
N/A
N/A
246
6.23
495
8.16
N/A
N/A
N/A
N/A
Arsenic Barium
Ng/L pg/L
1* 10 700
200.8 200.8 200.7
oerymurn
pg/L
4*
N/A
Dissolved
Total
Dissolved
Total
Dissolved
Total
Total
N/A
<1
N/A
<1
N/A
16
N/A
<1
<1
<1
<1
17
18
N/A
N/A
<1
N/A
<1
N/A
17
N/A
N/A
<1
N/A
<1
N/A
19
N/A
N/A
<1
N/A
<1
N/A
17
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
37
N/A
N/A
<1
N/A
<1
N/A
29
N/A
N/A
<1
N/A
<1
N/A
21
N/A
N/A
<1
N/A
<1
N/A
53
N/A
N/A
<1
N/A
<1
N/A
23
N/A
N/A
<1
N/A
<1
N/A
21
N/A
N/A
<1
N/A
<1
N/A
29
N/A
<1
<1
<1
<1
16
41
N/A
N/A
<1
N/A
<1
N/A
50
N/A
N/A
<1
N/A
<1
N/A
44
N/A
N/A
<1
N/A
<1
N/A
21
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
25
N/A
N/A
<1
N/A
<1
N/A
20
N/A
N/A
<1
N/A
<1
N/A
20
N/A
N/A
<1
N/A
<1
N/A
20
N/A
N/A
<1
N/A
<1
N/A
28
N/A
N/A
<1
N/A
<1
N/A
22
N/A
N/A
<1
N/A
<1
N/A
19
N/A
<1
<1
<1
<1
20
21
N/A
N/A
<1
N/A
<1
N/A
22
N/A
N/A
<1
N/A
<1
N/A
24
N/A
N/A
<1
N/A
<1
N/A
23
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
<1
N/A
31
N/A
N/A
<1
N/A
<1
N/A
29
N/A
N/A
<1
N/A
<1
N/A
26
N/A
N/A
<1
N/A
<1
N/A
22
N/A
N/A
<1
N/A
<1
N/A
28
N/A
N/A
<1
N/A
<1
N/A
29
N/A
N/A
<1
N/A
<1
N/A
24
N/A
<1
<1
<1
<1
27
28
N/A
N/A
<1
N/A
<1
N/A
30
N/A
N/A
<1
N/A
<1
N/A
33
N/A
N/A
<1
N/A
<1
N/A
30
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Boron
pg/L
700
200.7
Dissolved Total
N/A <50
<50 <50
N/A <50
N/A <50
N/A <50
N/A N/A
N/A <50
N/A <50
N/A <50
N/A <50
N/A <50
N/A <50
N/A <50
<50 <50
N/A <50
N/A <50
N/A <50
N/A N/A
N/A <50
N/A <50
N/A <50
N/A <50
N/A <50
N/A <50
N/A <50
<50 <50
N/A <50
N/A <50
N/A <50
N/A N/A
N/A <50
N/A <50
N/A <50
N/A <50
N/A <50
N/A <50
N/A <50
<50 <50
N/A <50
N/A <50
N/A <50
N/A N/A
Tables - Page 10

Table 4 - Groundwater Analytical Results
Analytical Parameter
Cadmium
Calcium
Chloride
Chromium
Cobalt
Copper
Iron
Lead
Magnesium
Manganese
Mercury
Units
pg/L
mg/L
mg/L
N9/L
pg/L
mg/L
Ng/L
pg/L
Ng/L
pg/L
pg/L
15A NCAC 02L .0202(g) Groundwater Quality Standard
2
NE
250
10
1'
1
300
15
NE
50
1
Analytical Method
200.8
200.7
300
200.7
200.8
200.7
200.7
200.8
200.7
200.8
245.1
Well Name Well Type Hydrostratigraph ic Unit Sample Collection
Date
Dissolved Total
Dissolved Total
Total
Dissolved Total
Dissolved Total
Dissolved Total
Dissolved Total
Dissolved Total
Dissolved Total
Dissolved Total
Dissolved Total
MW-10D
Compliance
Partially Weathered
3/8/2011
N/A
<1
N/A
N/A
6.8
N/A
<5
MW-10D
Compliance
Partially Weathered
7/5/2011
N/A
<1
N/A
N/A
6.5
N/A
<5
MW-10D
Compliance
Partially Weathered
11/2/2011
N/A
<1
N/A
N/A
6.5
N/A
<5
MW-10D
Compliance
Partially Weathered
3/7/2012
N/A
<1
N/A
N/A
5.9
N/A
<5
MW-10D
Compliance
Partially Weathered
7/3/2012
N/A
<1
N/A
N/A
5.2
N/A
<5
MW-10D
Compliance
Partially Weathered
11/7/2012
N/A
<1
N/A
82
5.5
N/A
<5
MW-10D
Compliance
Partially Weathered
3/6/2013
N/A
<1
N/A
84.9
5.5
N/A
<5
MW-10D
Compliance
Partially Weathered
7/8/2013
<1
<1
90.6
90.6
5.7
<5
<5
MW-10D
Compliance
Partially Weathered
11/5/2013
N/A
<1
N/A
92.5
5.4
N/A
<5
MW-10D
Compliance
Partially Weathered
3/4/2014
N/A
<1
N/A
<100
5.5
N/A
<5
MW-10D
Compliance
Partially Weathered
7/1/2014
N/A
<1
N/A
97.7
5.5
N/A
<5
MW-10D
Compliance
Partially Weathered
11/3/2014
N/A
N/A
N/A
N/A
N/A
N/A
N/A
MW-11D
Compliance
Bedrock
3/7/2011
N/A
<1
N/A
N/A
9.4
N/A
<5
MW-11D
Compliance
Bedrock
7/5/2011
N/A
<1
N/A
N/A
10
N/A
<5
MW-11D
Compliance
Bedrock
11/2/2011
N/A
<1
N/A
N/A
10
N/A
<5
MW-11D
Compliance
Bedrock
3/7/2012
N/A
<1
N/A
N/A
10
N/A
<5
MW-11 D
Compliance
Bedrock
7/3/2012
N/A
<1
N/A
N/A
9.5
N/A
<5
MW-11D
Compliance
Bedrock
11/712012
N/A
<1
N/A
14.7
9.6
N/A
<5
MW-11D
Compliance
Bedrock
3/7/2013
N/A
<1
N/A
15.7
10
N/A
<5
MW-11D
Compliance
Bedrock
7/9/2013
<1
<1
12.2
15.4
10
<5
<5
MW-11D
Compliance
Bedrock
11/5/2013
N/A
<1
N/A
15.1
9.6
N/A
<5
MW-11D
Compliance
Bedrock
3/4/2014
N/A
<1
N/A
13.9
10
N/A
<5
MW-11D
Compliance
Bedrock
7/1/2014
N/A
<1
N/A
19.6
10
N/A
<5
MW-11D
Compliance
Bedrock
11/3/2014
N/A
N/A
N/A
N/A
N/A
N/A
N/A
MW-11S
Compliance
Transition (Saprolite)
3/7/2011
N/A
<1
N/A
N/A
11
N/A
<5
MW-11S
Compliance
Transition (Saprolite)
7/5/2011
N/A
<1
N/A
N/A
11
N/A
<5
MW-11S
Compliance
Transition (Saprolite)
11/2/2011
N/A
<1
N/A
N/A
10
N/A
<5
MW-11S
Compliance
Transition (Saprolite)
3/7/2012
N/A
<1
N/A
N/A
8
N/A
<5
MW-11S
Compliance
Transition (Saprolite)
7/3/2012
N/A
<1
N/A
N/A
9.2
N/A
<5
MW-11S
Compliance
Transition (Saprolite)
11/7/2012
N/A
<1
N/A
11.1
9.3
N/A
<5
MW-11S
Compliance
Transition (Saprolite)
3/7/2013
N/A
<1
N/A
11
9.7
N/A
<5
MW-11S
Compliance
Transition (Saprolite)
7/9/2013
<1
<1
11.5
11.5
11
<5
<5
MW-11S
Compliance
Transition (Saprolite)
11/5/2013
N/A
<1
N/A
12.1
12
N/A
<5
MW-11S
Compliance
Transition (Saprolite)
3/4/2014
N/A
<1
N/A
13.3
14
N/A
<5
MW-11S
Compliance
Transition (Saprolite)
7/1/2014
N/A
<1
N/A
12
15
N/A
<5
MW-11S
Compliance
Transition (Saprolite)
11/3/2014
N/A
N/A
N/A
N/A
N/A
N/A
N/A
MW-12D
Compliance
Bedrock
3/8/2011
N/A
<1
N/A
N/A
2.2
N/A
<5
MW-12D
Compliance
Bedrock
7/5/2011
N/A
<1
N/A
N/A
2.3
N/A
<5
MW-12D
Compliance
Bedrock
11/2/2011
N/A
<1
N/A
N/A
2.2
N/A
<5
MW-12D
Compliance
Bedrock
3/7/2012
N/A
<1
N/A
N/A
2.1
N/A
<5
MW-12D
Compliance
Bedrock
7/3/2012
N/A
<1
N/A
N/A
1.9
N/A
<5
MW-12D
Compliance
Bedrock
11/7/2012
N/A
<1
N/A
5.44
2.1
N/A
<5
MW-12D
Compliance
Bedrock
3/7/2013
N/A
<1
N/A
5.06
2.1
N/A
<5
MW-12D
Compliance
Bedrock
7/9/2013
<1
<1
5.1
5.37
2.2
<5
<5
MW-12D
Compliance
Bedrock
11/4/2013
N/A
<1
N/A
5.21
2.1
N/A
<5
MW-12D
Compliance
Bedrock
3/4/2014
N/A
<1
N/A
5.36
2.2
N/A
<5
MW-12D
Compliance
Bedrock
7/1/2014
N/A
<1
N/A
5.38
2.2
N/A
<5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<0.005
N/A
335
N/A
<1
N/A
N/A
N/A
1130
N/A
<0.01
N/A
N/A
<0.005
N/A
279
N/A
<1
N/A
N/A
N/A
944
N/A
<0.0P
N/A
N/A
<0.005
N/A
193
N/A
<1
N/A
N/A
N/A
734
N/A
<0.0,1
N/A
N/A
<0.005
N/A
119
N/A
<1
N/A
N/A
N/A
634
N/A
<0.0f
N/A
N/A
<0.005
N/A
104
N/A
<1
N/A
N/A
N/A
539
N/A
<0.0,1
N/A
N/A
<0.005
N/A
136
N/A
<1
N/A
37.2
N/A
392
N/A
<0.0f
N/A
N/A
<0.005
N/A
188
N/A
<1
N/A
38
N/A
310
N/A
<0.0E
N/A
<0.005
<0.005
35
110
<1
<1
40
40.1
203
272
<0.05
<0.0f
N/A
N/A
<0.005
N/A
61
N/A
<1
N/A
41.1
N/A
159
N/A
<0.0f
N/A
N/A
<0.005
N/A
701
N/A
<1
N/A
40.3
N/A
228
N/A
<0.0f
N/A
N/A
<0.005
N/A
56
N/A
<1
N/A
42.4
N/A
110
N/A
<0.0,1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<0.005
N/A
318
N/A
<1
N/A
N/A
N/A
21
N/A
<0.0,1
N/A
N/A
<0.005
N/A
806
N/A
1.94
N/A
N/A
N/A
35
N/A
<0.0f
N/A
N/A
<0.005
N/A
968
N/A
2.62
N/A
N/A
N/A
56
N/A
<0.0f
N/A
N/A
<0.005
N/A
1720
N/A
5.1
N/A
N/A
N/A
69
N/A
<0.0E
N/A
N/A
<0.005
N/A
1260
N/A
2.82
N/A
N/A
N/A
41
N/A
<0.0f
N/A
N/A
<0.005
N/A
1610
N/A
4.3
N/A
6.27
N/A
56
N/A
<0.0P
N/A
N/A
<0.005
N/A
3230
N/A
8.42
N/A
6.67
N/A
122
N/A
<0.0E
N/A
<0.005
<0.005
26
3810
<1
6.51
5.07
7.05
27
81
<0.05
<0.0f
N/A
N/A
<0.005
N/A
2150
N/A
4.3
N/A
6.51
N/A
64
N/A
<0.0,1
N/A
N/A
<0.005
N/A
1710
N/A
2.57
N/A
6.02
N/A
41
N/A
<0.0f
N/A
N/A
0.009
N/A
7340
N/A
12.5
N/A
9.48
N/A
125
N/A
<0.0E
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<0.005
N/A
870
N/A
<1
N/A
N/A
N/A
242
N/A
<0.0"
N/A
N/A
<0.005
N/A
218
N/A
<1
N/A
N/A
N/A
153
N/A
<0.0f
N/A
N/A
<0.005
N/A
108
N/A
<1
N/A
N/A
N/A
120
N/A
<0.0f
N/A
N/A
<0.005
N/A
96
N/A
<1
N/A
N/A
N/A
136
N/A
<0.0.1
N/A
N/A
<0.005
N/A
570
N/A
<1
N/A
N/A
N/A
151
N/A
<0.0,1
N/A
N/A
<0.005
N/A
119
N/A
<1
N/A
7.48
N/A
126
N/A
<0.0f
N/A
N/A
<0.005
N/A
129
N/A
<1
N/A
7.58
N/A
106
N/A
<0.0!
N/A
<0.005
<0.005
<10
316
<1
<1
7.69
7.84
102
111
<0.05
<0.0f
N/A
N/A
<0.005
N/A
375
N/A
<1
N/A
8.17
N/A
139
N/A
<0.0,1
N/A
N/A
<0.005
N/A
1150
N/A
<1
N/A
9.03
N/A
132
N/A
<0.0f
N/A
N/A
<0.005
N/A
63
N/A
<1
N/A
8.12
N/A
129
N/A
<0.0,1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<0.005
N/A
1070
N/A
3.21
N/A
N/A
N/A
50
N/A
<0.0,1
N/A
N/A
<0.005
N/A
871
N/A
2.71
N/A
N/A
N/A
33
N/A
<0.0E
N/A
N/A
<0.005
N/A
994
N/A
2.03
N/A
N/A
N/A
38
N/A
<0.0E
N/A
N/A
<0.005
N/A
530
N/A
1.5
N/A
N/A
N/A
19
N/A
<0.0f
N/A
N/A
<0.005
N/A
281
N/A
<1
N/A
N/A
N/A
12
N/A
<0.0f
N/A
N/A
<0.005
N/A
203
N/A
<1
N/A
1.87
N/A
10
N/A
<0.0.1
N/A
N/A
<0.005
N/A
130
N/A
<1
N/A
1.71
N/A
7
N/A
<0.0f
N/A
<0.005
<0.005
<10
201
<1
<1
1.71
1.81
<5
7
<0.05
<0.0.1
N/A
N/A
<0.005
N/A
94
N/A
<1
N/A
1.77
N/A
<5
N/A
<0.0,1
N/A
N/A
<0.005
N/A
281
N/A
<1
N/A
1.78
N/A
7
N/A
<0.0f
N/A
N/A
<0.005
N/A
83
N/A
<1
N/A
1.81
N/A
<5
N/A
<0.0f
Tables - Page 11

Table 4 - Groundwater Analytical Results
Well Name Well Typ
MW-12D Complianc
OW-12S Complianc
VAW-12S Complianc
UW-12S Complianc
MW-12S Complianc
UW-12S Complianc
MW-12S Complianc
AW-12S Complianc
MW-12S Complianc
UW-12S Complianc
MW-12S Complianc
MW-12S Complianc
MW-12S Complianc
MW-13D Complianc
MW-13D Complianc
MW-13D Complianc
MW-13D Complianc
VIW-13D Complianc
MW-13D Complianc
SAW-13D Complianc
MW-13D Complianc
UW-13D Complianc
MW-13D Complianc
AW-13D Complianc
MW-13D Complianc
MW-1D Voluntary
MW-1D Voluntary
SAW-1D Voluntary
MW-1D Voluntary
MW-1D Voluntary
MW-1D Voluntary
MW-1D Voluntary
MW-1D Voluntary
MW-1D Voluntary
MW-1S Voluntary
UW-1S Voluntary
MW-1S Voluntary
UW-1S Voluntary
MW-1S Voluntary
MW-1S Voluntary
MW-1S Voluntary
MW-is Voluntary
MW-1S Voluntary
UW-1S Voluntary
MW-1S Voluntary
MW-is Voluntary
MW-1S Voluntary
Analytical Parameter
Units
Cadmium
pg/L
Calcium Chloride
mg/L mg/L
15A NCAC 02L .0202(g) Groundwater Quality Standard 2 NE 250
Analytical Method 200.8 200.7 300
Sample Collection
e Hydrostratigraphic Unit
Dissolved
Total
Dissolved
Total
Total
Date
e Bedrock
11/3/2014
N/A
N/A
N/A
N/A
N/A
e Transition (Saprolite)
3/8/2011
N/A
<1
N/A
N/A
4.2
e Transition (Saprolite)
7/5/2011
N/A
<1
N/A
N/A
3.6
e Transition (Saprolite)
11/2/2011
N/A
<1
N/A
N/A
2.6
e Transition (Saprolite)
3/7/2012
N/A
<1
N/A
N/A
3.4
e Transition (Saprolite)
7/3/2012
N/A
<1
N/A
N/A
2.2
e Transition (Saprolite)
11/7/2012
N/A
<1
N/A
5.21
2.4
e Transition (Saprolite)
3/7/2013
N/A
<1
N/A
4.79
6.5
e Transition (Saprolite)
7/9/2013
<1
<1
4.76
4.76
3.7
e Transition (Saprolite)
11/4/2013
N/A
<1
N/A
4.82
4
e Transition (Saprolite)
3/4/2014
N/A
<1
N/A
4.82
3
e Transition (Saprolite)
7/1/2014
N/A
<1
N/A
4.93
2.5
e Transition (Saprolite)
11/3/2014
N/A
N/A
N/A
N/A
N/A
e Bedrock
3/8/2011
N/A
<1
N/A
N/A
6
e Bedrock
7/5/2011
N/A
<1
N/A
N/A
6
e Bedrock
11/2/2011
N/A
<1
N/A
N/A
6.1
e Bedrock
3/7/2012
N/A
<1
N/A
N/A
5.8
e Bedrock
7/3/2012
N/A
<1
N/A
N/A
5.1
e Bedrock
11/7/2012
N/A
<1
N/A
12.3
5.6
e Bedrock
3/6/2013
N/A
<1
N/A
11.1
5.9
e Bedrock
7/8/2013
<1
<1
12.5
12.6
5
e Bedrock
11/4/2013
N/A
<1
N/A
13.1
5.8
e Bedrock
3/3/2014
N/A
<1
N/A
12.9
5.7
e Bedrock
7/1/2014
N/A
<1
N/A
15
6.2
e Bedrock
11/3/2014
N/A
N/A
N/A
N/A
N/A
Bedrock
11/15/2006
N/A
<0.5
N/A
41.204
10.43
Bedrock
5/1512007
N/A
<0.5
N/A
42.703
9.22
Bedrock
11/19/2007
N/A
<0.5
N/A
42
10.66
Bedrock
5/21/2008
N/A
<0.5
N/A
43.2
11
Bedrock
11/24/2008
N/A
<0.5
N/A
41.5
11
Bedrock
5/12/2009
N/A
<0.5
N/A
40
13
Bedrock
11/2/2009
N/A
<1
N/A
40.5
13
Bedrock
5/25/2010
N/A
<1
N/A
37.5
15
Bedrock
11/4/2013
N/A
N/A
N/A
N/A
N/A
Transition (Saprolite)
11/15/2006
N/A
<0.5
N/A
32.888
13.09
Transition (Saprolite)
5/15/2007
N/A
<0.5
N/A
32.917
10.9
Transition (Saprolite)
11/19/2007
N/A
<0.5
N/A
31.6
12.53
Transition (Saprolite)
5/21/2008
N/A
<0.5
N/A
33.8
13
Transition (Saprolite)
11/24/2008
N/A
<0.5
N/A
30.9
13
Transition (Saprolite)
11/25/2008
N/A
N/A
N/A
N/A
N/A
Transition (Saprolite)
5/12/2009
N/A
<0.5
N/A
27.4
20
Transition (Saprolite)
11/2/2009
N/A
<1
N/A
27.7
19
Transition (Saprolite)
5/25/2010
N/A
<1
N/A
26.5
22
Transition (Saprolite)
3/8/2011
N/A
N/A
N/A
N/A
N/A
Transition (Saprolite)
7/5/2011
N/A
N/A
N/A
N/A
N/A
Transition (Saprolite)
11/2/2011
N/A
N/A
N/A
N/A
N/A
Transition (Saprolite)
11/4/2013
N/A
N/A
N/A
N/A
N/A
Chromium Cobalt
pg/L pg/L
Copper
mg/L
10 1* 1
200.7 200.8 200.7
Dissolved
Total
Dissolved
Total
Dissolved
N/A
N/A
N/A
N/A
N/A
N/A
11
N/A
N/A
N/A
N/A
13
N/A
N/A
N/A
N/A
28
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
<5
<5
N/A
N/A
<0.005
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
<5
5
N/A
N/A
<0.005
N/A
5
N/A
N/A
N/A
N/A
7
N/A
N/A
N/A
N/A
5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
1.18
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
1.06
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
4.88
N/A
N/A
N/A
N/A
6.4
N/A
N/A
N/A
N/A
5.29
N/A
N/A
N/A
N/A
3.94
N/A
N/A
N/A
N/A
5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
1.4
N/A
N/A
N/A
N/A
1.8
N/A
N/A
N/A
N/A
2.33
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Total
N/A
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
N/A
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
N/A
0.004
<0.00:
<0.00:
<0.00:
<0.00:
<0.00
<0.00
<0.00
N/A
0.013
0.015
0.009
0.008
0.007
N/A
0.003
0.002
0.003
N/A
N/A
N/A
N/A
Iron
pg/L
Lead Magnesium
pg/L pg/L
300 15 NE
200.7
Total
200.8
Total
200.7
Dissolved
Dissolved
Dissolved
N/A
N/A
N/A
N/A
N/A
N/A
478
N/A
<1
N/A
N/A
246
N/A
<1
N/A
N/A
119
N/A
<1
N/A
N/A
196
N/A
<1
N/A
N/A
157
N/A
<1
N/A
N/A
117
N/A
<1
N/A
N/A
259
N/A
<1
N/A
39
571
<1
<1
2.02
N/A
721
N/A
<1
N/A
N/A
329
N/A
<1
N/A
N/A
236
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
179
N/A
<1
N/A
N/A
257
N/A
<1
N/A
N/A
64
N/A
<1
N/A
N/A
263
N/A
<1
N/A
N/A
47
N/A
<1
N/A
N/A
42
N/A
<1
N/A
N/A
228
N/A
<1
N/A
16
680
<1
<1
5.33
N/A
344
N/A
<1
N/A
N/A
1260
N/A
<1
N/A
N/A
134
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
161
N/A
<2
N/A
N/A
125
N/A
<2
N/A
N/A
169
N/A
<2
N/A
N/A
33
N/A
<2
N/A
N/A
55
N/A
<2
N/A
N/A
34
N/A
<1
N/A
N/A
20.5
N/A
<1
N/A
N/A
50.4
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
4682
N/A
<2
N/A
N/A
3420
N/A
<2
N/A
N/A
3180
N/A
<2
N/A
N/A
4020
N/A
<2
N/A
N/A
2210
N/A
<2
N/A
N/A
N/A
N/A
N/A
N/A
N/A
1210
N/A
<1
N/A
N/A
804
N/A
<1
N/A
N/A
1520
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Total
N/A
N/A
N/A
N/A
N/A
N/A
2.2
2.14
2.1
2.16
2.03
2.05
N/A
N/A
N/A
N/A
N/A
N/A
5.32
4.83
5.51
5.66
5.49
6.33
N/A
22.432
23.055
22.3
22.9
22.3
21.2
21.2
19.6
N/A
29.447
28.781
26.9
28.5
26.2
N/A
23
22.4
22.2
N/A
N/A
N/A
N/A
Manganese
Mercury
pg/L
pg/L
1
245.1
Dissolved
Total
50
200.8
Dissolved
Total
N/A
N/A
N/A
N/A
N/A
444
N/A
<O.OE
N/A
239
N/A
<O.OE
N/A
316
N/A
<O.OE
N/A
122
N/A
<O.OE
N/A
137
N/A
<O.OE
N/A
140
N/A
<O.OE
N/A
52
N/A
<O.OE
27
35
<0.05
<O.OE
N/A
68
N/A
<O.OE
N/A
53
N/A
<O.OE
N/A
79
N/A
<O.OE
N/A
N/A
N/A
N/A
N/A
15
N/A
<O.OE
N/A
6
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
<5
6
<0.05
<O.OE
N/A
<5
N/A
<O.OE
N/A
8
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
N/A
N/A
N/A
N/A
53
N/A
<0.2
N/A
43
N/A
<0.1
N/A
27
N/A
<0.1
N/A
27
N/A
<O.OE
N/A
23
N/A
<O.OE
N/A
21
N/A
<O.OE
N/A
19.3
N/A
<O.OE
N/A
13
N/A
<O.OE
N/A
N/A
N/A
N/A
N/A
476
N/A
<0.2
N/A
402
N/A
<0.1
N/A
215
N/A
<0.1
N/A
325
N/A
<O.OE
N/A
148
N/A
<O.OE
N/A
N/A
N/A
N/A
N/A
82
N/A
<O.OE
N/A
63.7
N/A
<O.OE
N/A
78.3
N/A
<O.OE
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Tables - Page 12

Table 4 - Groundwater Analytical Results
Analytical Parameter
Units
Cadmium
Ng/L
Calcium Chloride
mg/L mg/L
15A NCAC 02L .0202(g) Groundwater Quality Standard 2 NE 250
Analytical Method 200.8 200.7 300
Sample Collection
Well Name
Well Type
Hydrostratigraphic Unit
Dissolved
Total
Dissolved
Total
Total
Date
V1W-2D
Voluntary
Bedrock
11/15/2006
N/A
<0.5
N/A
23.254
5.28
MW-2D
Voluntary
Bedrock
5/16/2007
N/A
<0.5
N/A
19.723
4.78
AW-2D
Voluntary
Bedrock
11/19/2007
N/A
<0.5
N/A
21.5
4.51
MW-2D
Voluntary
Bedrock
5/21/2008
N/A
<0.5
N/A
21.3
5.6
VW-2S
Voluntary
Transition (Saprolite)
11/15/2006
N/A
<0.5
N/A
15.945
7.67
VIW-2S
Voluntary
Transition (Saprolite)
5/16/2007
N/A
<0.5
N/A
17.397
8.86
MW-2S
Voluntary
Transition (Saprolite)
11/19/2007
N/A
<0.5
N/A
16.6
6.99
MW-2S
Voluntary
Transition (Saprolite)
5/21/2008
N/A
<0.5
N/A
16.8
9.1
VW-3D
Voluntary
Bedrock
11/15/2006
N/A
<0.5
N/A
37.82
9.09
VIW-31D
Voluntary
Bedrock
5/15/2007
N/A
<0.5
N/A
36.932
7.99
VW-3D
Voluntary
Bedrock
11/19/2007
N/A
<0.5
N/A
34.5
8.99
MW-3D
Voluntary
Bedrock
5/21/2008
N/A
<0.5
N/A
35.9
8.6
VW-3D
Voluntary
Bedrock
11/24/2008
N/A
<0.5
N/A
31.4
9
VIW-31D
Voluntary
Bedrock
5/12/2009
N/A
<0.5
N/A
31.8
9.5
V1W-3D
Voluntary
Bedrock
11/2/2009
N/A
<1
N/A
31.9
9
MW-31D
Voluntary
Bedrock
5/25/2010
N/A
<1
N/A
29.4
9.1
VW-3D
Voluntary
Bedrock
11/4/2013
N/A
N/A
N/A
N/A
N/A
MW-3S
Voluntary
Transition (Saprolite)
11/15/2006
N/A
<0.5
N/A
11.023
10.8
MW-3S
Voluntary
Transition (Saprolite)
5/15/2007
N/A
<0.5
N/A
12
9.18
MW-3S
Voluntary
Transition (Saprolite)
11/19/2007
N/A
<0.5
N/A
10.3
10.6
AW-3S
Voluntary
Transition (Saprolite)
5/21/2008
N/A
<0.5
N/A
10.6
10
VIW-3S
Voluntary
Transition (Saprolite)
11/24/2008
N/A
<0.5
N/A
9.2
10
AW-3S
Voluntary
Transition (Saprolite)
5/12/2009
N/A
<0.5
N/A
9.41
10
MW-3S
Voluntary
Transition (Saprolite)
11/2/2009
N/A
<1
N/A
8.9
9.8
NW-3S
Voluntary
Transition (Saprolite)
5/25/2010
N/A
<1
N/A
8.92
9.4
V1W-33
Voluntary
Transition (Saprolite)
3/7/2011
N/A
N/A
N/A
N/A
N/A
MW-3S
Voluntary
Transition (Saprolite)
7/5/2011
N/A
N/A
N/A
N/A
N/A
MW-3S
Voluntary
Transition (Saprolite)
11/2/2011
N/A
N/A
N/A
N/A
N/A
AW-3S
Voluntary
Transition (Saprolite)
11/4/2013
N/A
N/A
N/A
N/A
N/A
MW-41D
Voluntary
Bedrock
11/14/2006
N/A
<0.5
N/A
16.947
8.15
MW-4D
Voluntary
Bedrock
5/15/2007
N/A
<0.5
N/A
16.671
7.64
MW-4D
Voluntary
Bedrock
11/19/2007
N/A
<0.5
N/A
15.7
6.39
VW-4D
Voluntary
Bedrock
5/21/2008
N/A
<0.5
N/A
16.2
5.8
MW-4D
Voluntary
Bedrock
11/24/2008
N/A
<0.5
N/A
15.1
6.4
VW-4D
Voluntary
Bedrock
5/12/2009
N/A
<0.5
N/A
15.6
8.5
MW-41D
Voluntary
Bedrock
11/2/2009
N/A
<1
N/A
16
8.4
V1W-4D
Voluntary
Bedrock
5/25/2010
N/A
<1
N/A
15.3
8.9
MW-41D
Voluntary
Bedrock
11/4/2013
N/A
N/A
N/A
N/A
N/A
MW-4S
Voluntary
Transition (Saprolite)
11/14/2006
N/A
<0.5
N/A
10.738
8.22
MW-4S
Voluntary
Transition (Saprolite)
5/15/2007
N/A
<0.5
N/A
10.171
7.91
VIW-4S
Voluntary
Transition (Saprolite)
11/19/2007
N/A
<0.5
N/A
9.94
7.62
V1W-4S
Voluntary
Transition (Saprolite)
5/21/2008
N/A
<0.5
N/A
10.7
8
AW-4S
Voluntary
Transition (Saprolite)
11/24/2008
N/A
<0.5
N/A
9.9
8.3
MW-4S
Voluntary
Transition (Saprolite)
5/12/2009
N/A
<0.5
N/A
11.2
9
AW-4S
Voluntary
Transition (Saprolite)
11/2/2009
N/A
<1
N/A
11.2
10
MW-4S
Voluntary
Transition (Saprolite)
5/25/2010
N/A
<1
N/A
10.8
8.5
V1W-4S
Voluntary
Transition (Saprolite)
3/7/2011
N/A
N/A
N/A
N/A
N/A
Chromium Cobalt
Ng/L pg/L
Copper
mg/L
10 1* 1
200.7 200.8 200.7
Dissolved
Total
Dissolved
Total
Dissolved
N/A
16.17
N/A
N/A
N/A
N/A
10
N/A
N/A
N/A
N/A
3.43
N/A
N/A
N/A
N/A
4.33
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
1.11
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
1.69
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Total
0.033
0.011
<0.00:
<0.00:
<0.00:
<0.00:
0.002
<0.00:
<0.00:
0.003
<0.00:
<0.00:
<0.00:
<0.00'
<0.00
<0.00'
N/A
<0.00:
<0.00:
<0.00:
<0.00:
<0.00:
<0.00
<0.00
<0.00
N/A
N/A
N/A
N/A
<0.00:
<0.00:
<0.00:
<0.00:
<0.00:
<0.00
<0.00'
<0.00
N/A
<0.00:
0.002
<0.00:
0.003
<0.00:
0.002
<0.00
<0.00'
N/A
Iron
pg/L
Lead Magnesium
pg/L pg/L
300
15
Total
NE
200.7
Dissolved
200.7
200.8
Dissolved
Total
Dissolved
N/A
9817
N/A
<2
N/A
N/A
1826
N/A
<2
N/A
N/A
166
N/A
<2
N/A
N/A
124
N/A
<2
N/A
N/A
102
N/A
<2
N/A
N/A
87
N/A
<2
N/A
N/A
215
N/A
<2
N/A
N/A
177
N/A
<2
N/A
N/A
342
N/A
<2
N/A
N/A
83
N/A
<2
N/A
N/A
57
N/A
<2
N/A
N/A
13
N/A
<2
N/A
N/A
13
N/A
<2
N/A
N/A
14
N/A
<1
N/A
N/A
<10
N/A
<1
N/A
N/A
<10
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
928
N/A
<2
N/A
N/A
1076
N/A
<2
N/A
N/A
604
N/A
<2
N/A
N/A
882
N/A
<2
N/A
N/A
1470
N/A
<2
N/A
N/A
1750
N/A
<1
N/A
N/A
645
N/A
<1
N/A
N/A
947
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
105
N/A
<2
N/A
N/A
11
N/A
<2
N/A
N/A
<10
N/A
<2
N/A
N/A
24
N/A
<2
N/A
N/A
<10
N/A
<2
N/A
N/A
165
N/A
<1
N/A
N/A
<10
N/A
<1
N/A
N/A
<10
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
404
N/A
<2
N/A
N/A
435
N/A
<2
N/A
N/A
1040
N/A
<2
N/A
N/A
6160
N/A
<2
N/A
N/A
232
N/A
<2
N/A
N/A
9210
N/A
1.9
N/A
N/A
1360
N/A
<1
N/A
N/A
694
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
Total
12.161
8.089
8.17
8.1
13.387
14.681
13.8
13.9
15.761
15.455
14.2
14.8
13.1
13
13
11.9
N/A
8.514
9.379
8
8.3
7.4
7.58
7.01
6.88
N/A
N/A
N/A
N/A
7.658
7.533
6.92
7.22
6.73
7.04
7.01
6.64
N/A
8.32
8.119
7.87
10.2
7.71
10.2
8.38
7.76
N/A
Manganese
Mercury
pg/L
pg/L
1
245.1
Dissolved
Total
50
200.8
Dissolved
Total
N/A
267
N/A
<0.2
N/A
66
N/A
<0.1
N/A
7
N/A
<0.1
N/A
6
N/A
<O.OE
N/A
361
N/A
<0.2
N/A
400
N/A
<0.1
N/A
466
N/A
<0.1
N/A
296
N/A
<O.OE
N/A
73
N/A
<0.2
N/A
56
N/A
<0.1
N/A
48
N/A
<0.1
N/A
49
N/A
<O.OE
N/A
43
N/A
<O.OE
N/A
42
N/A
<O.OE
N/A
42.6
N/A
<O.OE
N/A
39.1
N/A
<O.OE
N/A
N/A
N/A
N/A
N/A
2672
N/A
<0.2
N/A
2796
N/A
<0.1
N/A
2310
N/A
<0.1
N/A
2310
N/A
<O.OE
N/A
1990
N/A
<O.OE
N/A
1990
N/A
<O.OE
N/A
1950
N/A
<O.OE
N/A
1850
N/A
<O.OE
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
31
N/A
<0.2
N/A
9
N/A
<0.1
N/A
7
N/A
<0.1
N/A
5
N/A
0.12E
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
N/A
N/A
N/A
N/A
286
N/A
<0.2
N/A
153
N/A
<0.1
N/A
103
N/A
<0.1
N/A
159
N/A
<O.OE
N/A
72
N/A
<O.OE
N/A
192
N/A
<O.OE
N/A
81
N/A
<O.OE
N/A
69.6
N/A
<O.OE
N/A
N/A
N/A
N/A
Tables - Page 13

Table 4 - Groundwater Analytical Results
Well Name Well Typ
MW-4S Voluntary
AW-4S Voluntary
VAW-4S Voluntary
UW-5D Voluntary
MW-5D Voluntary
NW-5D Voluntary
MW-5D Voluntary
MW-5D Voluntary
MW-5D Voluntary
UW-5D Voluntary
MW-5D Voluntary
UW-5D Voluntary
MW-5S Voluntary
MW-5S Voluntary
MW-5S Voluntary
AW-5S Voluntary
MW-5S Voluntary
MW-5S Voluntary
MW-5S Voluntary
SAW-5S Voluntary
MW-5S Voluntary
UW-5S Voluntary
MW-5S Voluntary
AW-5S Voluntary
MW-6D Complianc
MW-6D Complianc
MW-61D Complianc
SAW-6D Complianc
MW-6D Complianc
MW-6D Complianc
MW-6D Complianc
MW-6D Complianc
MW-6D Complianc
MW-6D Complianc
MW-6D Complianc
UW-6D Complianc
MW-61D Complianc
NW-6D Complianc
MW-6D Complianc
SAW-6D Complianc
MW-6D Complianc
NW-6D Complianc
MW-61D Complianc
UW-6D Complianc
MW-6S Complianc
MW-6S Complianc
MW-6S Complianc
Analytical Parameter
Units
Cadmium
Ng/L
Calcium Chloride
mg/L mg/L
15A NCAC 02L .0202(g) Groundwater Quality Standard 2 NE 250
Analytical Method 200.8 200.7 300
Sample Collection
e Hydrostratigraphic Unit
Dissolved
Total
Dissolved
Total
Total
Date
Transition (Saprolite)
7/5/2011
N/A
N/A
N/A
N/A
N/A
Transition (Saprolite)
11/2/2011
N/A
N/A
N/A
N/A
N/A
Transition (Saprolite)
11/412013
N/A
N/A
N/A
N/A
N/A
Bedrock
11/15/2006
N/A
<0.5
N/A
16.458
9.12
Bedrock
5/16/2007
N/A
<0.5
N/A
15.818
8.3
Bedrock
11/20/2007
N/A
<0.5
N/A
14.5
9.43
Bedrock
5/21/2008
N/A
<0.5
N/A
15.2
9.3
Bedrock
11/24/2008
N/A
<0.5
N/A
14.2
8.6
Bedrock
5/12/2009
N/A
<0.5
N/A
15
9.4
Bedrock
11/2/2009
N/A
<1
N/A
15.4
9.1
Bedrock
5/25/2010
N/A
<1
N/A
14.7
9.5
Bedrock
11/4/2013
N/A
N/A
N/A
N/A
N/A
Transition (Saprolite)
11/15/2006
N/A
<0.5
N/A
7.724
7.67
Transition (Saprolite)
5/16/2007
N/A
<0.5
N/A
7.221
7.97
Transition (Saprolite)
11/20/2007
N/A
<0.5
N/A
8.18
8.73
Transition (Saprolite)
5/21/2008
N/A
<0.5
N/A
8.14
9.6
Transition (Saprolite)
11/24/2008
N/A
<0.5
N/A
8.13
8.2
Transition (Saprolite)
5/12/2009
N/A
<0.5
N/A
7.71
9
Transition (Saprolite)
11/2/2009
N/A
<1
N/A
8.19
8.8
Transition (Saprolite)
5/2512010
N/A
<1
N/A
7.01
9.5
Transition (Saprolite)
3/8/2011
N/A
N/A
N/A
N/A
N/A
Transition (Saprolite)
7/5/2011
N/A
N/A
N/A
N/A
N/A
Transition (Saprolite)
11/2/2011
N/A
N/A
N/A
N/A
N/A
Transition (Saprolite)
11/4/2013
N/A
N/A
N/A
N/A
N/A
e Bedrock
11/14/2006
N/A
<0.5
N/A
5.469
1.21
e Bedrock
5/15/2007
N/A
<0.5
N/A
5.826
1.32
e Bedrock
11/20/2007
N/A
<0.5
N/A
5.81
1.63
e Bedrock
5/21/2008
N/A
<0.5
N/A
7.26
2
e Bedrock
11/24/2008
N/A
<0.5
N/A
7.56
1.7
e Bedrock
5/12/2009
N/A
<0.5
N/A
8.79
2.3
e Bedrock
11/2/2009
N/A
<1
N/A
9.35
2.1
e Bedrock
5/25/2010
N/A
<1
N/A
9.83
2.2
e Bedrock
3/7/2011
N/A
<1
N/A
N/A
2.5
e Bedrock
7/5/2011
N/A
<1
N/A
N/A
2.7
e Bedrock
11/2/2011
N/A
<1
N/A
N/A
2.6
e Bedrock
3/7/2012
N/A
<1
N/A
N/A
2.6
e Bedrock
7/3/2012
N/A
<1
N/A
N/A
2.5
e Bedrock
11/7/2012
N/A
<1
N/A
11.2
2.7
e Bedrock
3/6/2013
N/A
<1
N/A
11.3
2.8
e Bedrock
7/8/2013
<1
<1
12.3
12.5
2.8
e Bedrock
11/4/2013
N/A
<1
N/A
12.4
3
e Bedrock
3/3/2014
N/A
<1
N/A
13
4.3
e Bedrock
7/1/2014
N/A
<1
N/A
12.7
3.2
e Bedrock
11/3/2014
N/A
N/A
N/A
N/A
N/A
e Transition (Saprolite)
11/14/2006
N/A
<0.5
N/A
2.286
4.13
e Transition (Saprolite)
5/15/2007
N/A
<0.5
N/A
1.997
4.23
e Transition (Saprolite)
11/20/2007
N/A
<0.5
N/A
2
3.81
Chromium Cobalt
Ng/L pg/L
Copper
mg/L
10 1* 1
200.7 200.8 200.7
Dissolved
Total
Dissolved
Total
Dissolved
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
1.2
N/A
N/A
N/A
N/A
1.86
N/A
N/A
N/A
N/A
1.02
N/A
N/A
N/A
N/A
1.58
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
1.3
N/A
N/A
N/A
N/A
1.26
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
2.35
N/A
N/A
N/A
N/A
3
N/A
N/A
N/A
N/A
2.33
N/A
N/A
N/A
N/A
1.58
N/A
N/A
N/A
N/A
1.74
N/A
N/A
N/A
N/A
1.1
N/A
N/A
N/A
N/A
1.4
N/A
N/A
N/A
N/A
1.1
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
<5
<5
N/A
N/A
<0.005
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
1.78
N/A
N/A
N/A
N/A
2.3
N/A
N/A
N/A
N/A
2.58
N/A
N/A
N/A
Total
N/A
N/A
N/A
<0.00:
<0.00:
<0.00:
<0.00:
<0.00:
<0.00
<0.00'
<0.00
N/A
0.002
0.003
0.007
<0.00:
<0.00:
<0.00'
0.003
0.002
N/A
N/A
N/A
N/A
0.005
0.004
<0.00:
<0.00:
<0.00:
<0.00'
<0.00
<0.00'
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
N/A
0.005
<0.00:
0.002
Iron
pg/L
Lead Magnesium
pg/L pg/L
300 15 NE
200.7
Total
200.8
Total
200.7
Dissolved
Dissolved
Dissolved
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
62
N/A
<2
N/A
N/A
41
N/A
<2
N/A
N/A
40
N/A
<2
N/A
N/A
12
N/A
<2
N/A
N/A
<10
N/A
<2
N/A
N/A
49
N/A
<1
N/A
N/A
<10
N/A
<1
N/A
N/A
<10
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
185
N/A
<2
N/A
N/A
114
N/A
<2
N/A
N/A
1220
N/A
<2
N/A
N/A
194
N/A
<2
N/A
N/A
66
N/A
<2
N/A
N/A
135
N/A
<1
N/A
N/A
788
N/A
<1
N/A
N/A
232
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
641
N/A
<2
N/A
N/A
247
N/A
<2
N/A
N/A
37
N/A
<2
N/A
N/A
10
N/A
<2
N/A
N/A
10
N/A
<2
N/A
N/A
<10
N/A
<1
N/A
N/A
<10
N/A
<1
N/A
N/A
<10
N/A
<1
N/A
N/A
31
N/A
<1
N/A
N/A
<10
N/A
<1
N/A
N/A
<10
N/A
<1
N/A
N/A
26
N/A
<1
N/A
N/A
18
N/A
<1
N/A
N/A
25
N/A
<1
N/A
N/A
62
N/A
<1
N/A
14
127
<1
<1
6.99
N/A
55
N/A
<1
N/A
N/A
47
N/A
<1
N/A
N/A
78
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
652
N/A
<2
N/A
N/A
36
N/A
<2
N/A
N/A
799
N/A
<2
N/A
Total
N/A
N/A
N/A
6.647
6.502
5.9
6.21
5.86
6.13
6.12
5.82
N/A
2.292
2.277
2.6
2.48
2.41
2.4
2.43
2.32
N/A
N/A
N/A
N/A
3.409
3.653
3.59
4.41
4.62
5.28
5.46
5.7
N/A
N/A
N/A
N/A
N/A
6.53
6.51
7.13
7.14
7.28
7.21
N/A
2.67
2.372
2.4
Manganese
Mercury
pg/L
pg/L
1
245.1
Dissolved
Total
50
200.8
Dissolved
Total
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
17
N/A
<0.2
N/A
8
N/A
<0.1
N/A
8
N/A
<0.1
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
N/A
N/A
N/A
N/A
165
N/A
<0.2
N/A
60
N/A
<0.1
N/A
62
N/A
<0.1
N/A
15
N/A
0.054
N/A
7
N/A
<O.OE
N/A
8
N/A
<O.OE
N/A
28
N/A
<O.OE
N/A
8.74
N/A
<O.OE
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
53
N/A
<0.2
N/A
15
N/A
<0.1
N/A
<5
N/A
<0.1
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<0.0E
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
<5
<5
<0.05
<O.OE
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
N/A
N/A
N/A
N/A
54
N/A
<0.2
N/A
20
N/A
<0.1
N/A
34
N/A
<0.1
Tables - Page 14

Table 4 - Groundwater Analytical Results
Well Name Well Typ
VIW-6S
V1W-6S
VIW-6S
VlW-6S
VIW-6S
VIW-6S
VIW-6S
Vl W-6S
VIW-6S
VIW-6S
VIW-6S
VlW-6S
VIW-6S
VlW-6S
VIW-6S
MW-6S
VIW-6S
MW-7D
VIW-7D
VIW-7D
VIW-7D
VIW-7D
VIW-7D
VI W-7D
VIW-7D
VI W-7D
VIW-7D
VIW-7D
VIW-7D
V1W-7S
VIW-7S
V1W-7S
VIW-7S
MW-7S
VIW-7S
V1W-7S
VIW-7S
VIW-7S
VIW-7S
Vl W-7S
VIW-7S
V1W-8D
VIW-8D
VIW-8D
VIW-8D
VlW-8D
VIW-8D
Analytical Parameter
Units
Cadmium
pg/L
Calcium Chloride
mg/L mg/L
15A NCAC 02L .0202(g) Groundwater Quality Standard 2 NE 250
Analytical Method 200.8 200.7 300
e Hydrostratigraphic Unit
Sample Collection
Dissolved
Total
Dissolved
Total
Total
Date
3 Transition (Saprolite)
5/21/2008
N/A
<0.5
N/A
2.15
4.5
Transition (Saprolite)
11/24/2008
N/A
<0.5
N/A
1.87
3.5
3 Transition (Saprolite)
5/12/2009
N/A
<0.5
N/A
1.96
4.3
a Transition (Saprolite)
11/2/2009
N/A
<1
N/A
1.88
4.2
3 Transition (Saprolite)
5/25/2010
N/A
<1
N/A
2.2
4.7
3 Transition (Saprolite)
3/7/2011
N/A
<1
N/A
N/A
4.9
3 Transition (Saprolite)
7/5/2011
N/A
<1
N/A
N/A
4.7
Transition (Saprolite)
11/2/2011
N/A
<1
N/A
N/A
4.8
3 Transition (Saprolite)
3/7/2012
N/A
<1
N/A
N/A
4.5
3 Transition (Saprolite)
7/3/2012
N/A
<1
N/A
N/A
4
3 Transition (Saprolite)
11/7/2012
N/A
<1
N/A
2.25
4.2
Transition (Saprolite)
3/6/2013
N/A
<1
N/A
2.34
4.6
Transition (Saprolite)
7/8/2013
<1
<1
2.51
2.49
4.6
Transition (Saprolite)
11/4/2013
N/A
<1
N/A
2.34
4.6
3 Transition (Saprolite)
3/3/2014
N/A
<1
N/A
2.36
4.7
3 Transition (Saprolite)
7/1/2014
N/A
<1
N/A
2.2
4.7
a Transition (Saprolite)
11/3/2014
N/A
N/A
N/A
N/A
N/A
E) Bedrock
3/8/2011
N/A
<1
N/A
N/A
3.7
3 Bedrock
7/5/2011
N/A
<1
N/A
N/A
4.8
Bedrock
11/2/2011
N/A
<1
N/A
N/A
2.5
3 Bedrock
3/7/2012
N/A
<1
N/A
N/A
6.6
Bedrock
7/3/2012
N/A
<1
N/A
N/A
3.6
3 Bedrock
11/7/2012
N/A
<1
N/A
14.6
2.4
3 Bedrock
3/6/2013
N/A
<1
N/A
8.09
7.4
3 Bedrock
7/8/2013
<1
<1
9.89
9.44
8.3
3 Bedrock
11/4/2013
N/A
<1
N/A
12.2
2.6
3 Bedrock
3/3/2014
N/A
<1
N/A
10.1
7.9
Bedrock
7/1/2014
N/A
<1
N/A
8.76
4.3
Bedrock
11/3/2014
N/A
N/A
N/A
N/A
N/A
Transition (Saprolite)
3/8/2011
N/A
<1
N/A
N/A
5.6
3 Transition (Saprolite)
7/5/2011
N/A
<1
N/A
N/A
5.8
Transition (Saprolite)
11/2/2011
N/A
<1
N/A
N/A
9.6
Transition (Saprolite)
3/7/2012
N/A
<1
N/A
N/A
6.3
a Transition (Saprolite)
7/3/2012
N/A
<1
N/A
N/A
5.5
3 Transition (Saprolite)
11/7/2012
N/A
<1
N/A
5.42
9
9 Transition (Saprolite)
3/6/2013
N/A
<1
N/A
5.11
7
3 Transition (Saprolite)
7/8/2013
<1
<1
5.24
5.28
6.4
E) Transition (Saprolite)
11/4/2013
N/A
<1
N/A
5.65
5.8
3 Transition (Saprolite)
3/3/2014
N/A
<1
N/A
5.56
7.8
9 Transition (Saprolite)
7/1/2014
N/A
<1
N/A
6.05
8.9
3 Transition (Saprolite)
11/3/2014
N/A
N/A
N/A
N/A
N/A
9 Partially Weathered
3/7/2011
N/A
<1
N/A
N/A
3.3
3 Partially Weathered
7/5/2011
N/A
<1
N/A
N/A
3.3
Partially Weathered
11/2/2011
N/A
<1
N/A
N/A
3.4
Partially Weathered
3/7/2012
N/A
<1
N/A
N/A
3.2
Partially Weathered
7/3/2012
N/A
<1
N/A
N/A
3
3 Partially Weathered
11/7/2012
N/A
<1
N/A
10.4
3.2
Chromium Cobalt
pg/L pg/L
Copper
mg/L
10 1* 1
200.7 200.8 200.7
Dissolved
Total
Dissolved
Total
Dissolved
N/A
2.05
N/A
N/A
N/A
N/A
2.36
N/A
N/A
N/A
N/A
1.6
N/A
N/A
N/A
N/A
1.5
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
<5
<5
N/A
N/A
<0.005
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
<5
<5
N/A
N/A
<0.005
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
6
N/A
N/A
N/A
N/A
8
N/A
N/A
N/A
N/A
6
N/A
N/A
N/A
N/A
8
N/A
N/A
N/A
N/A
8
N/A
N/A
N/A
N/A
6
N/A
N/A
N/A
N/A
9
N/A
N/A
N/A
8
8
N/A
N/A
<0.005
N/A
9
N/A
N/A
N/A
N/A
8
N/A
N/A
N/A
N/A
7
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
Total
0.002
0.002
0.001
<0.00'
0.006
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
N/A
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
N/A
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
N/A
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
<0.00!
Iron
pg/L
Lead Magnesium
pg/L pg/L
300
15
Total
NE
200.7
Dissolved
200.7
200.8
Dissolved
Total
Dissolved
N/A
995
N/A
<2
N/A
N/A
710
N/A
<2
N/A
N/A
505
N/A
<1
N/A
N/A
306
N/A
<1
N/A
N/A
1270
N/A
<1
N/A
N/A
323
N/A
<1
N/A
N/A
139
N/A
<1
N/A
N/A
56
N/A
<1
N/A
N/A
185
N/A
<1
N/A
N/A
137
N/A
<1
N/A
N/A
51
N/A
<1
N/A
N/A
142
N/A
<1
N/A
210
201
<1
<1
2.91
N/A
247
N/A
<1
N/A
N/A
37
N/A
<1
N/A
N/A
70
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
265
N/A
<1
N/A
N/A
453
N/A
<1
N/A
N/A
274
N/A
<1
N/A
N/A
413
N/A
<1
N/A
N/A
234
N/A
<1
N/A
N/A
334
N/A
<1
N/A
N/A
218
N/A
<1
N/A
<10
216
<1
<1
5.92
N/A
96
N/A
<1
N/A
N/A
151
N/A
<1
N/A
N/A
59
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
67
N/A
<1
N/A
N/A
199
N/A
<1
N/A
N/A
89
N/A
<1
N/A
N/A
41
N/A
<1
N/A
N/A
47
N/A
<1
N/A
N/A
38
N/A
<1
N/A
N/A
14
N/A
<1
N/A
28
68
<1
<1
6.72
N/A
76
N/A
<1
N/A
N/A
77
N/A
<1
N/A
N/A
69
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
353
N/A
<1
N/A
N/A
147
N/A
<1
N/A
N/A
88
N/A
<1
N/A
N/A
129
N/A
<1
N/A
N/A
64
N/A
<1
N/A
N/A
111
N/A
<1
N/A
Total
2.62
2.29
2.33
2.18
2.57
N/A
N/A
N/A
N/A
N/A
2.63
2.71
2.89
2.69
2.67
2.51
N/A
N/A
N/A
N/A
N/A
N/A
6.7
4.51
5.84
6.18
7.75
6.52
N/A
N/A
N/A
N/A
N/A
N/A
6.96
6.6
6.76
7.36
7.12
7.78
N/A
N/A
N/A
N/A
N/A
N/A
5.12
Manganese
Mercury
pg/L
pg/L
1
245.1
Dissolved
Total
50
200.8
Dissolved
Total
N/A
38
N/A
<O.OE
N/A
40
N/A
<O.OE
N/A
27
N/A
<O.OE
N/A
21.1
N/A
<O.OE
N/A
228
N/A
<O.OE
N/A
100
N/A
<O.OE
N/A
97
N/A
<O.OE
N/A
59
N/A
<O.OE
N/A
80
N/A
<O.OE
N/A
114
N/A
<O.OE
N/A
60
N/A
<O.OE
N/A
72
N/A
<O.OE
153
135
<0.05
<O.OE
N/A
73
N/A
<O.OE
N/A
73
N/A
<O.OE
N/A
43
N/A
<O.OE
N/A
N/A
N/A
N/A
N/A
98
N/A
<O.OE
N/A
129
N/A
<O.OE
N/A
45
N/A
<O.OE
N/A
87
N/A
<O.OE
N/A
41
N/A
<O.OE
N/A
19
N/A
<O.OE
N/A
19
N/A
<O.OE
26
43
<0.05
<O.OE
N/A
11
N/A
<O.OE
N/A
21
N/A
<O.OE
N/A
18
N/A
<O.OE
N/A
N/A
N/A
N/A
N/A
70
N/A
<O.OE
N/A
36
N/A
<O.OE
N/A
57
N/A
<O.OE
N/A
30
N/A
<O.OE
N/A
35
N/A
<O.OE
N/A
71
N/A
<O.OE
N/A
30
N/A
<O.OE
18
21
<0.05
<O.OE
N/A
20
N/A
<O.OE
N/A
55
N/A
<O.OE
N/A
33
N/A
<O.OE
N/A
N/A
N/A
N/A
N/A
35
N/A
<O.OE
N/A
13
N/A
<O.OE
N/A
7
N/A
<O.OE
N/A
6
N/A
<O.OE
N/A
<5
N/A
<O.OE
N/A
<5
N/A
<O.OE
Tables - Page 15

Table 4 - Groundwater Analytical Results
Analytical Parameter Cadmium Calcium Chloride Chromium Cobalt Copper Iron Lead Magnesium Manganese Mercury
Units pg/L mg/L mg/L p9/L pg/L mg/L pg/L pg/L pg/L pg/L pg/L
15A NCAC 02L .0202(g) Groundwater Quality Standard 2 NE 250 10 1* 1 300 15 NE 50 1
Analytical Method
200.8
200.7
300
200.7
200.8
200.7
200.7
200.8
200.7
200.8
245.1
Sample Collection
Well Name
Well Type
Hydrostratigraphic Unit
Dissolved
Total
Dissolved
Total
Total
Dissolved
Total
Dissolved
Total
Dissolved
Total
Dissolved
Total
Dissolved
Total
Dissolved
Total
Dissolved
Total
Dissolved
Total
Date
MW-8D
Compliance
Partially Weathered
3/6/2013
N/A
<1
N/A
10.1
3.2
N/A
<5
N/A
N/A
N/A
<0.005
N/A
157
N/A
<1
N/A
4.83
N/A
<5
N/A
<O.OE
MW-8D
Compliance
Partially Weathered
7/8/2013
<1
<1
10.7
10.9
3.4
<5
<5
N/A
N/A
<0.005
<0.005
12
307
<1
<1
5.01
5.19
<5
5
<0.05
<O.OE
MW-81D
Compliance
Partially Weathered
11/412013
N/A
<1
N/A
10.3
3.2
N/A
<5
N/A
N/A
N/A
<0.005
N/A
224
N/A
<1
N/A
4.99
N/A
<5
N/A
<O.OE
MW-8D
Compliance
Partially Weathered
3/3/2014
N/A
<1
N/A
11.1
3.3
N/A
<5
N/A
N/A
N/A
<0.005
N/A
432
N/A
<1
N/A
5.31
N/A
6
N/A
<O.OE
MW-8D
Compliance
Partially Weathered
7/1/2014
N/A
<1
N/A
10.7
3.4
N/A
<5
N/A
N/A
N/A
<0.005
N/A
87
N/A
<1
N/A
5.06
N/A
<5
N/A
<O.OE
MW-8D
Compliance
Partially Weathered
11/3/2014
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
MW-8S
Compliance
Transition (Saprolite)
3/7/2011
N/A
<1
N/A
N/A
3.7
N/A
<5
N/A
N/A
N/A
<0.005
N/A
559
N/A
<1
N/A
N/A
N/A
360
N/A
<O.OE
MW-8S
Compliance
Transition (Saprolite)
7/5/2011
N/A
<1
N/A
N/A
3.2
N/A
<5
N/A
N/A
N/A
<0.005
N/A
1360
N/A
<1
N/A
N/A
N/A
84
N/A
<O.OE
MW-8S
Compliance
Transition (Saprolite)
11/2/2011
N/A
<1
N/A
N/A
3.2
N/A
<5
N/A
N/A
N/A
<0.005
N/A
84
N/A
<1
N/A
N/A
N/A
22
N/A
<O.OE
MW-8S
Compliance
Transition (Saprolite)
3/7/2012
N/A
<1
N/A
N/A
3.4
N/A
<5
N/A
N/A
N/A
<0.005
N/A
2000
N/A
<1
N/A
N/A
N/A
246
N/A
<O.OE
MW-8S
Compliance
Transition (Saprolite)
7/3/2012
N/A
<1
N/A
N/A
2.6
N/A
<5
N/A
N/A
N/A
<0.005
N/A
282
N/A
<1
N/A
N/A
N/A
116
N/A
<O.OE
MW-8S
Compliance
Transition (Saprolite)
11/7/2012
N/A
<1
N/A
13.1
2.9
N/A
<5
N/A
N/A
N/A
<0.005
N/A
75
N/A
<1
N/A
8.05
N/A
38
N/A
<O.OE
MW-8S
Compliance
Transition (Saprolite)
3/6/2013
N/A
<1
N/A
14.8
3.3
N/A
<5
N/A
N/A
N/A
<0.005
N/A
849
N/A
<1
N/A
10
N/A
62
N/A
<O.OE
MW-8S
Compliance
Transition (Saprolite)
7/8/2013
<1
<1
11.5
12.2
2.9
<5
<5
N/A
N/A
<0.005
0.007
52
4730
<1
<1
6.97
8.42
<5
152
<0.05
<O.OE
MW-8S
Compliance
Transition (Saprolite)
11/4/2013
N/A
<1
N/A
10.7
2.9
N/A
6
N/A
N/A
N/A
0.011
N/A
7610
N/A
<1
N/A
7.66
N/A
127
N/A
<O.OE
MW-8S
Compliance
Transition (Saprolite)
3/3/2014
N/A
<1
N/A
12.6
3
N/A
<5
N/A
N/A
N/A
0.009
N/A
6550
N/A
<1
N/A
8.37
N/A
225
N/A
<O.OE
MW-8S
Compliance
Transition (Saprolite)
7/1/2014
N/A
<1
N/A
12.5
3.2
N/A
<5
N/A
N/A
N/A
<0.005
N/A
679
N/A
<1
N/A
7.45
N/A
27
N/A
<O.OE
MW-8S
Compliance
Transition (Saprolite)
11/3/2014
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
MW-9D
Compliance
Bedrock
3/7/2011
N/A
<1
N/A
N/A
6.4
N/A
<5
N/A
N/A
N/A
<0.005
N/A
370
N/A
<1
N/A
N/A
N/A
18
N/A
<O.OE
MW-9D
Compliance
Bedrock
7/5/2011
N/A
<1
N/A
N/A
6.3
N/A
<5
N/A
N/A
N/A
<0.005
N/A
52
N/A
<1
N/A
N/A
N/A
<5
N/A
<O.OE
MW-9D
Compliance
Bedrock
11/2/2011
N/A
<1
N/A
N/A
6.6
N/A
<5
N/A
N/A
N/A
<0.005
N/A
41
N/A
<1
N/A
N/A
N/A
<5
N/A
<O.OE
MW-9D
Compliance
Bedrock
3/7/2012
N/A
<1
N/A
N/A
6.4
N/A
<5
N/A
N/A
N/A
<0.005
N/A
79
N/A
<1
N/A
N/A
N/A
<5
N/A
<O.OE
MW-91D
Compliance
Bedrock
7/3/2012
N/A
<1
N/A
N/A
5.6
N/A
<5
N/A
N/A
N/A
<0.005
N/A
46
N/A
<1
N/A
N/A
N/A
<5
N/A
<O.OE
MW-9D
Compliance
Bedrock
11/7/2012
N/A
<1
N/A
19.1
6.5
N/A
<5
N/A
N/A
N/A
<0.005
N/A
103
N/A
<1
N/A
6.44
N/A
5
N/A
<O.OE
MW-9D
Compliance
Bedrock
3/7/2013
N/A
<1
N/A
19
6.7
N/A
<5
N/A
N/A
N/A
<0.005
N/A
10
N/A
<1
N/A
6.29
N/A
<5
N/A
<O.OE
MW-9D
Compliance
Bedrock
7/9/2013
<1
<1
20.1
20.5
6.9
<5
<5
N/A
N/A
<0.005
<0.005
<10
37
<1
<1
6.64
6.78
<5
<5
<0.05
<O.OE
MW-9D
Compliance
Bedrock
11/512013
N/A
<1
N/A
21.2
7
N/A
<5
N/A
N/A
N/A
<0.005
N/A
91
N/A
<1
N/A
7.03
N/A
<5
N/A
<O.OE
MW-9D
Compliance
Bedrock
3/4/2014
N/A
<1
N/A
23
6.9
N/A
<5
N/A
N/A
N/A
<0.005
N/A
120
N/A
<1
N/A
7.31
N/A
<5
N/A
<O.OE
MW-9D
Compliance
Bedrock
7/1/2014
N/A
<1
N/A
24.5
7.3
N/A
<5
N/A
N/A
N/A
<0.005
N/A
35
N/A
<1
N/A
7.69
N/A
<5
N/A
<O.OE
MW-9D
Compliance
Bedrock
11/3/2014
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
MW-9S
Compliance
Transition (Saprolite)
3/7/2011
N/A
<1
N/A
N/A
6.2
N/A
<5
N/A
N/A
N/A
<0.005
N/A
584
N/A
<1
N/A
N/A
N/A
63
N/A
<O.OE
MW-9S
Compliance
Transition (Saprolite)
7/5/2011
N/A
<1
N/A
N/A
6.1
N/A
<5
N/A
N/A
N/A
<0.005
N/A
366
N/A
<1
N/A
N/A
N/A
88
N/A
<O.OE
MW-9S
Compliance
Transition (Saprolite)
11/2/2011
N/A
<1
N/A
N/A
6.6
N/A
<5
N/A
N/A
N/A
<0.005
N/A
227
N/A
<1
N/A
N/A
N/A
55
N/A
<O.OE
MW-9S
Compliance
Transition (Saprolite)
3/7/2012
N/A
<1
N/A
N/A
5.8
N/A
<5
N/A
N/A
N/A
<0.005
N/A
70
N/A
<1
N/A
N/A
N/A
45
N/A
<O.OE
MW-9S
Compliance
Transition (Saprolite)
7/3/2012
N/A
<1
N/A
N/A
5.2
N/A
<5
N/A
N/A
N/A
<0.005
N/A
190
N/A
<1
N/A
N/A
N/A
45
N/A
<O.OE
MW-9S
Compliance
Transition (Saprolite)
11/7/2012
N/A
<1
N/A
19
6.2
N/A
<5
N/A
N/A
N/A
<0.005
N/A
195
N/A
<1
N/A
6.89
N/A
38
N/A
<O.OE
MW-9S
Compliance
Transition (Saprolite)
3/7/2013
N/A
<1
N/A
19.1
6.2
N/A
<5
N/A
N/A
N/A
<0.005
N/A
75
N/A
<1
N/A
6.92
N/A
22
N/A
<O.OE
MW-9S
Compliance
Transition (Saprolite)
7/9/2013
<1
<1
21
21.4
7.3
<5
<5
N/A
N/A
<0.005
<0.005
<10
26
<1
<1
7.34
7.55
19
27
<0.05
<O.OE
MW-9S
Compliance
Transition (Saprolite)
11/5/2013
N/A
<1
N/A
22.4
6.8
N/A
<5
N/A
N/A
N/A
<0.005
N/A
147
N/A
<1
N/A
7.84
N/A
22
N/A
<O.OE
MW-9S
Compliance
Transition (Saprolite)
3/4/2014
N/A
<1
N/A
23.8
6
N/A
<5
N/A
N/A
N/A
<0.005
N/A
443
N/A
<1
N/A
8.44
N/A
29
N/A
<O.OE
MW-9S
Compliance
Transition (Saprolite)
7/1/2014
N/A
<1
N/A
24.8
6.7
N/A
<5
N/A
N/A
N/A
<0.005
N/A
24
N/A
<1
N/A
8.15
N/A
9
N/A
<O.OE
MW-9S
Compliance
Transition (Saprolite)
11/3/2014
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Tables - Page 16

Table 4 - Groundwater Analytical Results
Analytical Parameter Molydenum Nickel Nitrate as N Potassium Selenium Sodium Strontium Sulfate TDS Thallium TOC TSS Zinc
Units pg/L Ng/L mg -NIL mg/L pg/L mg/L N/A mg/L mg/L pg/L mg/L mg/L mg/L
15A NCAC 02L .0202(g) Groundwater Quality Standard NE 100 10 NE 20 NE NE 250 500 0.2* NE NE 1
Analytical Method 200.8 200.7 300.0 200.7 200.8 200.7 N/A 300.0 2540C 200.8 5310E 2450D 200.7
Well Name Well Type Hydrostratigraphic Unit Sample Collection Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Total Total Total Dissolved Total Total Total Dissolved Total
Date
OW-10D
Compliance
Partially Weathered
OW-10D
Compliance
Partially Weathered
OW-10D
Compliance
Partially Weathered
OW-10D
Compliance
Partially Weathered
OW-10D
Compliance
Partially Weathered
OW-10D
Compliance
Partially Weathered
OW-10D
Compliance
Partially Weathered
OW-10D
Compliance
Partially Weathered
OW-10D
Compliance
Partially Weathered
NW-10D
Compliance
Partially Weathered
OW-10D
Compliance
Partially Weathered
OW-10D
Compliance
Partially Weathered
OW-11D
Compliance
Bedrock
OW-11D
Compliance
Bedrock
OW-11D
Compliance
Bedrock
OW-11D
Compliance
Bedrock
OW-11D
Compliance
Bedrock
OW-11D
Compliance
Bedrock
OW-11D
Compliance
Bedrock
NW-11D
Compliance
Bedrock
OW-11D
Compliance
Bedrock
OW-11D
Compliance
Bedrock
OW-11D
Compliance
Bedrock
OW-11D
Compliance
Bedrock
OW-11S
Compliance
Transition (Saprolite)
NW-11S
Compliance
Transition (Saprolite)
OW-11S
Compliance
Transition (Saprolite)
OW-11S
Compliance
Transition (Saprolite)
OW-11S
Compliance
Transition (Saprolite)
OW-11S
Compliance
Transition (Saprolite)
OW-11S
Compliance
Transition (Saprolite)
OW-11S
Compliance
Transition (Saprolite)
OW-11S
Compliance
Transition (Saprolite)
OW-11S
Compliance
Transition (Saprolite)
OW-11S
Compliance
Transition (Saprolite)
Ow-11 S
Compliance
Transition (Saprolite)
OW-12D
Compliance
Bedrock
NW-12D
Compliance
Bedrock
OW-12D
Compliance
Bedrock
OW-12D
Compliance
Bedrock
OW-12D
Compliance
Bedrock
OW-12D
Compliance
Bedrock
OW-12D
Compliance
Bedrock
OW-12D
Compliance
Bedrock
OW-12D
Compliance
Bedrock
NW-12D
Compliance
Bedrock
OW-12D
Compliance
Bedrock
3/8/2011
N/A
N/A
N/A
<5
0.88
N/A
7/5/2011
N/A
N/A
N/A
<5
1
N/A
11/2/2011
N/A
N/A
N/A
<5
0.9
N/A
3/7/2012
N/A
N/A
N/A
<5
0.98
N/A
7/3/2012
N/A
N/A
N/A
<5
1
N/A
11/7/2012
N/A
N/A
N/A
<5
0.87
N/A
3/6/2013
N/A
N/A
N/A
<5
0.93
N/A
7/8/2013
N/A
N/A
<5
<5
1
3.62
11/5/2013
N/A
N/A
N/A
<5
1.1
N/A
3/4/2014
N/A
N/A
N/A
<5
1.2
N/A
7/1/2014
N/A
N/A
N/A
<5
1.3
N/A
11/3/2014
N/A
N/A
N/A
N/A
N/A
N/A
3/7/2011
N/A
N/A
N/A
<5
<0.1
N/A
7/5/2011
N/A
N/A
N/A
<5
<0.023
N/A
11/2/2011
N/A
N/A
N/A
<5
<0.023
N/A
3/7/2012
N/A
N/A
N/A
<5
0.04
N/A
7/3/2012
N/A
N/A
N/A
<5
<0.023
N/A
11/7/2012
N/A
N/A
N/A
<5
<0.023
N/A
3/7/2013
N/A
N/A
N/A
<5
0.03
N/A
7/9/2013
N/A
N/A
<5
<5
<0.023
1.42
11/5/2013
N/A
N/A
N/A
<5
<0.023
N/A
3/4/2014
N/A
N/A
N/A
<5
<0.023
N/A
7/1/2014
N/A
N/A
N/A
8
<0.023
N/A
11/3/2014
N/A
N/A
N/A
N/A
N/A
N/A
3/7/2011
N/A
N/A
N/A
<5
<0.1
N/A
7/5/2011
N/A
N/A
N/A
<5
<0.023
N/A
11/2/2011
N/A
N/A
N/A
<5
<0.023
N/A
3/7/2012
N/A
N/A
N/A
<5
<0.02
N/A
7/3/2012
N/A
N/A
N/A
<5
<0.023
N/A
11/7/2012
N/A
N/A
N/A
<5
<0.023
N/A
3/7/2013
N/A
N/A
N/A
<5
<0.023
N/A
7/9/2013
N/A
N/A
<5
<5
<0.023
0.499
11/5/2013
N/A
N/A
N/A
<5
<0.023
N/A
3/4/2014
N/A
N/A
N/A
<5
<0.023
N/A
7/1/2014
N/A
N/A
N/A
<5
<0.023
N/A
11/3/2014
N/A
N/A
N/A
N/A
N/A
N/A
3/8/2011
N/A
N/A
N/A
<5
0.91
N/A
7/5/2011
N/A
N/A
N/A
<5
0.93
N/A
11/2/2011
N/A
N/A
N/A
<5
0.89
N/A
3/7/2012
N/A
N/A
N/A
<5
0.89
N/A
7/3/2012
N/A
N/A
N/A
<5
0.9
N/A
11/7/2012
N/A
N/A
N/A
<5
0.86
N/A
3/7/2013
N/A
N/A
N/A
<5
0.88
N/A
7/9/2013
N/A
N/A
<5
<5
0.89
1.04
11/4/2013
N/A
N/A
N/A
<5
0.86
N/A
3/4/2014
N/A
N/A
N/A
<5
0.87
N/A
7/1/2014
N/A
N/A
N/A
<5
0.89
N/A
N/A
N/A
<1
N/A
N/A
N/A
340
570
N/A
N/A
<1
N/A
N/A
N/A
320
490
N/A
N/A
<1
N/A
N/A
N/A
350
600
N/A
N/A
<1
N/A
N/A
N/A
330
561
N/A
N/A
<1
N/A
N/A
N/A
340
604
3.72
N/A
<1
N/A
13.5
N/A
340
580
3.81
N/A
<1
N/A
13.2
N/A
350
630
3.68
<1
<1
13.8
14
N/A
380
660
3.52
N/A
<1
N/A
12.8
N/A
370
640
4.09
N/A
<1
N/A
14.1
N/A
360
640
3.6
N/A
<1
N/A
13.2
N/A
390
650
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
3.6
140
N/A
N/A
<1
N/A
N/A
N/A
39
160
N/A
N/A
<1
N/A
N/A
N/A
36
160
N/A
N/A
<1
N/A
N/A
N/A
34
151
N/A
N/A
<1
N/A
N/A
N/A
35
<250
1.8
N/A
<1
N/A
12.5
N/A
33
190
2.17
N/A
<1
N/A
11.6
N/A
33
240
2.1
<1
<1
12.4
12.6
N/A
35
170
1.77
N/A
<1
N/A
12.8
N/A
33
180
1.69
N/A
<1
N/A
12.9
N/A
32
160
2.88
N/A
<1
N/A
13.5
N/A
34
180
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
23
120
N/A
N/A
<1
N/A
N/A
N/A
22
120
N/A
N/A
<1
N/A
N/A
N/A
22
130
N/A
N/A
<1
N/A
N/A
N/A
17
122
N/A
N/A
<1
N/A
N/A
N/A
20
<250
0.569
N/A
<1
N/A
14.7
N/A
20
120
0.508
N/A
<1
N/A
13.6
N/A
20
130
0.568
<1
<1
14.9
15.1
N/A
22
140
0.576
N/A
<1
N/A
15.7
N/A
21
130
0.772
N/A
<1
N/A
15.7
N/A
21
150
0.486
N/A
<1
N/A
14.6
N/A
23
130
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
1.9
81
N/A
N/A
<1
N/A
N/A
N/A
1.1
80
N/A
N/A
<1
N/A
N/A
N/A
1.1
76
N/A
N/A
<1
N/A
N/A
N/A
0.62
85
N/A
N/A
<1
N/A
N/A
N/A
0.48
<250
1.24
N/A
<1
N/A
5.65
N/A
0.46
82
1.09
N/A
<1
N/A
5.12
N/A
0.39
74
1.17
<1
<1
5.33
5.52
N/A
0.38
90
1.08
N/A
<1
N/A
5.36
N/A
0.35
83
1.19
N/A
<1
N/A
5.29
N/A
0.3
79
1.14
N/A
<1
N/A
5.54
N/A
0.3
79
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
<0.2
<0.2
N/A
<5
<0.005
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
0.005
N/A
<0.2
N/A
N/A
N/A
0.006
N/A
<0.2
N/A
N/A
N/A
0.01
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
0.009
N/A
<0.2
N/A
N/A
N/A
0.017
<0.2
<0.2
N/A
420
<0.005
0.019
N/A
<0.2
N/A
N/A
N/A
0.009
N/A
<0.2
N/A
N/A
N/A
0.011
N/A
<0.2
N/A
N/A
N/A
0.028
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
<0.2
<0.2
N/A
<5
<0.005
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<0.2
N/A
N/A
N/A
0.007
N/A
<0.2
N/A
N/A
N/A
0.005
N/A
<0.2
N/A
N/A
N/A
0.01
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
<0.2
<0.2
N/A
12
<0.005
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
N/A
<0.2
N/A
N/A
N/A
<0.005
Tables - Page 17

Table 4 - Groundwater Analytical Results
Well Name
OW-12D
OW-12S
OW-12S
VIW-12S
OW-12S
OW-12S
OW-12S
OW-12S
OW-12S
OW-12S
OW-12S
OW-12S
OW-12S
OW-13D
OW-13D
OW-13D
OW-13D
OW-13D
OW-13D
OW-13D
OW-13D
OW-13D
OW-13D
OW-13D
OW-13D
OW-1 D
OW-1 D
OW-1 D
OW-1D
OW-1 D
OW-1 D
OW-1 D
OW-1 D
OW-1 D
v1W-1S
v1W-1S
v1W-1S
v1W-1S
v1W-1S
v1W-1S
v1W-1S
v1W-1S
v1W-1S
v1W-1S
v1W-1S
v1W-1S
v1W-1S
15A NCAC 02L .0202(g) Grounc
Well Type
Hydrostratigraphic Unit
Compliance
Bedrock
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Analytical Parameter Molydenum Nickel Nitrate as N Potassium Selenium Sodium Strontium Sulfate TDS Thallium TOC TSS Zinc
Units
water Quality Standard
Analytical Method
Sample Collection
Date
11 /3/2014
3/8/2011
7/5/2011
11/2/2011
3/7/2012
7/3/2012
11 /7/2012
3/7/2013
7/9/2013
11 /4/2013
3/4/2014
7/1 /2014
11 /3/2014
3/8/2011
7/5/2011
11 /2/2011
3/7/2012
7/3/2012
11 /7/2012
3/6/2013
7/8/2013
11 /4/2013
3/3/2014
7/1 /2014
11 /3/2014
11 /15/2006
5/15/2007
11 /19/2007
5/21 /2008
11 /24/2008
5/12/2009
11 /2/2009
5/25/2010
11 /4/2013
11 /15/2006
5/15/2007
11119/2007
5/21/2008
11 /24/2008
11 /25/2008
5/12/2009
11 /2/2009
5/25/2010
3/8/2011
7/5/2011
11/2/2011
11 /4/2013
pg/L
NE
200.8
Dissolved
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Total
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
pg/L
100
200.7
Dissolved
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Total
N/A
<5
<5
<5
<5
<5
<5
<5
<5
<5
<5
<5
N/A
<5
<5
<5
<5
<5
<5
<5
<5
<5
<5
<5
N/A
<2
2
<2
<2
<2
<1
<1
<1
N/A
3.86
4.55
3.19
3.42
2.86
N/A
<1
1
1.19
N/A
N/A
N/A
N/A
mg -NIL
mg/L
pg/L
mg/L
10 NE 20 NE
300.0
200.7
200.8
200.7
Dissolved
Total
Total
Dissolved
Total
Dissolved
Total
N/A
N/A
N/A
N/A
N/A
N/A
N/A
0.62
N/A
N/A
N/A
<1
N/A
N/A
0.63
N/A
N/A
N/A
<1
N/A
N/A
0.59
N/A
N/A
N/A
<1
N/A
N/A
0.71
N/A
N/A
N/A
<1
N/A
N/A
0.76
N/A
N/A
N/A
<1
N/A
N/A
0.66
N/A
0.857
N/A
<1
N/A
7.61
0.36
N/A
0.731
N/A
<1
N/A
9.79
0.7
0.669
0.75
<1
<1
7.94
8.37
0.7
N/A
0.792
N/A
<1
N/A
8.96
0.77
N/A
0.685
N/A
<1
N/A
7.69
0.83
N/A
0.694
N/A
<1
N/A
7.28
N/A
N/A
N/A
N/A
N/A
N/A
N/A
2.1
N/A
N/A
N/A
<1
N/A
N/A
2.5
N/A
N/A
N/A
<1
N/A
N/A
2
N/A
N/A
N/A
<1
N/A
N/A
1.9
N/A
N/A
N/A
<1
N/A
N/A
2.5
N/A
N/A
N/A
<1
N/A
N/A
2
N/A
1.65
N/A
<1
N/A
8.06
1.9
N/A
1.59
N/A
<1
N/A
7.47
2.2
1.62
1.7
<1
<1
8.04
8.12
2.3
N/A
1.64
N/A
<1
N/A
8.14
1.9
N/A
1.76
N/A
<1
N/A
8.31
2.6
N/A
1.83
N/A
<1
N/A
9
N/A
N/A
N/A
N/A
N/A
N/A
N/A
0.19
N/A
1.64
N/A
<2
N/A
11.431
0.17
N/A
1.87
N/A
<2
N/A
11.892
0.09
N/A
1.79
N/A
<2
N/A
11
0.15
N/A
1.8
N/A
<2
N/A
11
<0.23
N/A
1.76
N/A
<2
N/A
11
0.43
N/A
1.81
N/A
<1
N/A
11
0.54
N/A
1.76
N/A
<1
N/A
10.9
1.06
N/A
1.71
N/A
<1
N/A
10.3
N/A
N/A
N/A
N/A
N/A
N/A
N/A
0.77
N/A
1.06
N/A
<2
N/A
17.048
0.52
N/A
0.81
N/A
<2
N/A
15.638
0.41
N/A
0.67
N/A
<2
N/A
15.2
0.67
N/A
0.77
N/A
<2
N/A
14.7
0.6
N/A
0.58
N/A
<2
N/A
14.4
N/A
N/A
N/A
N/A
N/A
N/A
N/A
1.91
N/A
0.49
N/A
<1
N/A
13.6
1.71
N/A
0.47
N/A
<1
N/A
14
2.25
N/A
0.456
N/A
<1
N/A
13.5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
mg/L
mg/L
pg/L
mg/L
NE 250 500 0.2* NE
N/A 300.0 2540C 200.8 5310E
Total
Total
Total
Dissolved
Total
Total
N/A
N/A
N/A
N/A
N/A
N/A
N/A
15
110
N/A
<0.2
N/A
N/A
4
87
N/A
<0.2
N/A
N/A
5.1
110
N/A
<0.2
N/A
N/A
1.4
98
N/A
<0.2
N/A
N/A
0.66
<250
N/A
<0.2
N/A
N/A
0.68
94
N/A
<0.2
N/A
N/A
2.4
100
N/A
<0.2
N/A
N/A
0.58
110
<0.2
<0.2
N/A
N/A
0.5
110
N/A
<0.2
N/A
N/A
0.38
95
N/A
<0.2
N/A
N/A
0.18
89
N/A
<0.2
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
3.2
130
N/A
<0.2
N/A
N/A
2.5
140
N/A
<0.2
N/A
N/A
2.2
140
N/A
<0.2
N/A
N/A
2.1
126
N/A
<0.2
N/A
N/A
2.2
<250
N/A
<0.2
N/A
N/A
2.1
130
N/A
<0.2
N/A
N/A
2
140
N/A
<0.2
N/A
N/A
2.3
150
<0.2
<0.2
N/A
N/A
2.2
140
N/A
<0.2
N/A
N/A
2.2
140
N/A
<0.2
N/A
N/A
2.3
150
N/A
<0.2
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
25.79
270
N/A
N/A
0.51
N/A
29.87
268
N/A
N/A
0.48
N/A
36.99
258
N/A
N/A
0.577
N/A
36
160
N/A
N/A
0.66
N/A
40
260
N/A
N/A
0.43
N/A
28
248
N/A
N/A
0.412
N/A
28
254
N/A
N/A
0.451
N/A
19
208
N/A
N/A
0.273
N/A
N/A
N/A
N/A
N/A
N/A
N/A
23.62
270
N/A
N/A
0.77
N/A
27.3
380
N/A
N/A
0.8
N/A
33.67
289
N/A
N/A
0.663
N/A
32
160
N/A
N/A
0.85
N/A
37
254
N/A
N/A
2.31
N/A
N/A
N/A
N/A
N/A
N/A
N/A
12
220
N/A
N/A
0.508
N/A
15
248
N/A
N/A
0.559
N/A
7.9
219
N/A
N/A
0.424
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
mg/L
NE
2450D
Total
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
6
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
mg/L
1
200.7
Dissolved
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<0.005
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<0.005
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Total
N/A
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
N/A
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
N/A
-0.005
0.014
-0.005
-0.005
-0.005
-0.005
-0.005
,0.005
N/A
0.019
0.016
0.008
0.013
0.007
N/A
0.008
-0.005
-0.005
N/A
N/A
N/A
N/A
Tables - Page 18

Table 4 - Groundwater Analytical Results
Well Name
OW-2D
OW-2D
OW-2D
OW-2D
OW-2S
OW-2S
OW-2S
NW-2S
OW-3D
NW-3D
OW-3D
OW-3D
OW-3D
OW-3D
OW-3D
OW-3D
OW-3D
OW-3S
OW-3S
NW-3S
OW-3S
OW-3S
OW-3S
OW-3S
OW-3S
NW-3S
OW-3S
OW-3S
OW-3S
OW-4D
OW-4D
OW-4D
OW-4D
OW-4D
OW-4D
OW-4D
OW-4D
NW-4D
OW-4S
OW-4S
OW-4S
OW-4S
OW-4S
OW-4S
OW-4S
NW-4S
OW-4S
Well Typ
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
Voluntary
15A NCAC 02L .0202(g) Grounc
e Hydrostratigraphic Unit
Bedrock
Bedrock
Bedrock
Bedrock
Transition (Saprolite)
Transition (Saprolite)
Transition (Saprolite)
Transition (Saprolite)
Bedrock
Bedrock
Bedrock
Bedrock
Bedrock
Bedrock
Bedrock
Bedrock
Bedrock
Transition (Saprolite)
Transition (Saprolite)
Transition (Saprolite)
Transition (Saprolite)
Transition (Saprolite)
Transition (Saprolite)
Transition (Saprolite)
Transition (Saprolite)
Transition (Saprolite)
Transition (Saprolite)
Transition (Saprolite)
Transition (Saprolite)
Bedrock
Bedrock
Bedrock
Bedrock
Bedrock
Bedrock
Bedrock
Bedrock
Bedrock
Transition (Saprolite)
Transition (Saprolite)
Transition (Saprolite)
Transition (Saprolite)
Transition (Saprolite)
Transition (Saprolite)
Transition (Saprolite)
Transition (Saprolite)
Transition (Saprolite)
Analytical Parameter Molydenum Nickel Nitrate as N Potassium Selenium Sodium Strontium Sulfate TDS Thallium TOC TSS Zinc
Units
water Quality Standard
Analytical Method
Sample Collection
Date
11 /15/2006
5/16/2007
11 /19/2007
5/21 /2008
11 /15/2006
5/16/2007
11 /19/2007
5/21 /2008
11 /15/2006
5/15/2007
11 /19/2007
5/21 /2008
11 /24/2008
5/12/2009
11 /2/2009
5/25/2010
11 /4/2013
1111512006
5/15/2007
11 /19/2007
5/21 /2008
11 /24/2008
5/12/2009
11 /2/2009
5/25/2010
3/7/2011
7/5/2011
11 /2/2011
11 /4/2013
11114/2006
5/15/2007
11 /19/2007
5/21 /2008
11 /24/2008
5/12/2009
11 /2/2009
5/25/2010
11 /4/2013
11 /14/2006
5/15/2007
11 /19/2007
5/21 /2008
11 /24/2008
5/12/2009
11 /2/2009
5/25/2010
3/7/2011
pg/L pg/L mg -NIL mg/L pg/L mg/L N/A mg/L mg/L pg/L mg/L mg/L mg/L
NE 100
200.8
200.7
Dissolved
Total
Dissolved
Total
N/A
N/A
N/A
7.2
N/A
N/A
N/A
3.24
N/A
N/A
N/A
<2
N/A
N/A
N/A
<2
N/A
N/A
N/A
2.64
N/A
N/A
N/A
2.93
N/A
N/A
N/A
3.71
N/A
N/A
N/A
2.81
N/A
N/A
N/A
<2
N/A
N/A
N/A
2
N/A
N/A
N/A
<2
N/A
N/A
N/A
<2
N/A
N/A
N/A
<2
N/A
N/A
N/A
<1
N/A
N/A
N/A
<1
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
N/A
N/A
2.21
N/A
N/A
N/A
<2
N/A
N/A
N/A
<2
N/A
N/A
N/A
<2
N/A
N/A
N/A
1.1
N/A
N/A
N/A
1.3
N/A
N/A
N/A
1.28
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
N/A
N/A
2
N/A
N/A
N/A
<2
N/A
N/A
N/A
<2
N/A
N/A
N/A
<2
N/A
N/A
N/A
<1
N/A
N/A
N/A
<1
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<2
N/A
N/A
N/A
2
N/A
N/A
N/A
<2
N/A
N/A
N/A
<2
N/A
N/A
N/A
<2
N/A
N/A
N/A
<1
N/A
N/A
N/A
<1
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
10
300.0
Total
0.53
0.45
0.35
0.39
<0.02
0.02
<0.02
<0.02
<0.02
<0.02
<0.02
<0.02
<0.23
<0.02
<0.02
<0.02
N/A
<0.02
<0.02
<0.02
<0.02
<0.23
0.04
<0.02
<0.02
N/A
N/A
N/A
N/A
<0.02
<0.02
<0.02
<0.02
<0.23
<0.02
<0.02
<0.02
N/A
<0.02
<0.02
<0.02
<0.02
<0.23
0.03
0.03
<0.02
N/A
NE 20 NE
200.7
200.8
Dissolved
Total
200.7
Dissolved
Dissolved
Total
N/A
3.24
N/A
<2
N/A
N/A
1.52
N/A
<2
N/A
N/A
1.22
N/A
<2
N/A
N/A
1.17
N/A
<2
N/A
N/A
0.31
N/A
<2
N/A
N/A
0.44
N/A
<2
N/A
N/A
0.46
N/A
<2
N/A
N/A
0.41
N/A
<2
N/A
N/A
2.65
N/A
<2
N/A
N/A
2.69
N/A
<2
N/A
N/A
2.49
N/A
<2
N/A
N/A
2.52
N/A
<2
N/A
N/A
2.32
N/A
<2
N/A
N/A
2.46
N/A
<1
N/A
N/A
2.46
N/A
<1
N/A
N/A
2.29
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
0.79
N/A
<2
N/A
N/A
0.91
N/A
<2
N/A
N/A
0.88
N/A
<2
N/A
N/A
0.8
N/A
<2
N/A
N/A
0.86
N/A
<2
N/A
N/A
0.85
N/A
<1
N/A
N/A
0.856
N/A
<1
N/A
N/A
0.757
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
1.27
N/A
<2
N/A
N/A
1.36
N/A
<2
N/A
N/A
1.24
N/A
<2
N/A
N/A
1.24
N/A
<2
N/A
N/A
1.18
N/A
<2
N/A
N/A
1.33
N/A
<1
N/A
N/A
1.29
N/A
<1
N/A
N/A
1.19
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
1.51
N/A
<2
N/A
N/A
1.4
N/A
<2
N/A
N/A
1.61
N/A
<2
N/A
N/A
3.61
N/A
<2
N/A
N/A
1.23
N/A
<2
N/A
N/A
4.41
N/A
<1
N/A
N/A
1.82
N/A
<1
N/A
N/A
1.43
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
Total
9.518
8.979
9.18
8.97
10.13
10.192
9.1
9.43
14.475
14.234
13.4
14.2
13
14
13.9
13.1
N/A
15.46
15.112
15.1
14.9
14.6
14.7
15.3
13.8
N/A
N/A
N/A
N/A
12.532
12.256
11.5
11.7
11.2
12.1
12
11.4
N/A
14.984
14.262
14
14.7
13.9
14.6
15.2
14.3
N/A
NE 250 500 0.2* NE NE 1
N/A 300.0 2540C 200.8 5310E 2450D 200.7
Total
Total
Total
Dissolved
Total
Total
Total
Dissolved
N/A
37.63
160
N/A
N/A
0.2
N/A
N/A
N/A
33.92
168
N/A
N/A
0.2
N/A
N/A
N/A
53.98
165
N/A
N/A
0.177
N/A
N/A
N/A
51
38
N/A
N/A
0.2
N/A
N/A
N/A
85.69
160
N/A
N/A
0.43
N/A
N/A
N/A
94.76
184
N/A
N/A
0.41
N/A
N/A
N/A
94.63
154
N/A
N/A
0.462
N/A
N/A
N/A
84
160
N/A
N/A
0.44
N/A
N/A
N/A
106.07
250
N/A
N/A
0.29
N/A
N/A
N/A
114
268
N/A
N/A
0.29
N/A
N/A
N/A
105.48
237
N/A
N/A
0.299
N/A
N/A
N/A
100
110
N/A
N/A
0.39
N/A
N/A
N/A
94
220
N/A
N/A
0.272
N/A
N/A
N/A
88
202
N/A
N/A
0.306
N/A
N/A
N/A
81
224
N/A
N/A
0.373
N/A
N/A
N/A
81
187
N/A
N/A
0.174
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
64.93
130
N/A
N/A
0.33
N/A
N/A
N/A
71.71
152
N/A
N/A
0.31
N/A
N/A
N/A
65.83
114
N/A
N/A
0.329
N/A
N/A
N/A
61
66
N/A
N/A
0.38
N/A
N/A
N/A
57
114
N/A
N/A
0.332
N/A
N/A
N/A
55
108
N/A
N/A
0.299
N/A
N/A
N/A
52
130
N/A
N/A
0.314
N/A
N/A
N/A
53
86
N/A
N/A
0.208
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
30.41
140
N/A
N/A
0.27
N/A
N/A
N/A
30.4
158
N/A
N/A
0.29
N/A
N/A
N/A
30.41
118
N/A
N/A
0.426
N/A
N/A
N/A
28
14
N/A
N/A
0.32
N/A
N/A
N/A
29
72
N/A
N/A
0.258
N/A
N/A
N/A
29
114
N/A
N/A
0.3
N/A
N/A
N/A
28
150
N/A
N/A
0.311
N/A
N/A
N/A
28
124
N/A
N/A
0.156
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
25.35
110
N/A
N/A
0.26
N/A
N/A
N/A
24.37
152
N/A
N/A
0.26
N/A
N/A
N/A
23.57
87
N/A
N/A
0.234
N/A
N/A
N/A
22
140
N/A
N/A
0.31
N/A
N/A
N/A
23
48
N/A
N/A
0.216
N/A
N/A
N/A
23
94
N/A
N/A
0.511
N/A
N/A
N/A
23
88
N/A
N/A
0.282
N/A
N/A
N/A
22
87
N/A
N/A
0.128
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Total
0.038
0.006
-0.005
-0.005
0.023
0.015
0.013
0.016
0.006
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
N/A
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
N/A
N/A
N/A
N/A
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
N/A
-0.005
-0.005
-0.005
0.019
-0.005
0.03
-0.005
-0.005
N/A
Tables - Page 19

Table 4 - Groundwater Analytical Results
Well Name
OW-4S
OW-4S
OW-4S
v1W-5D
OW-5D
OW-5D
OW-5D
v1W-5D
OW-5D
OW-5D
OW-5D
OW-5D
OW-5S
OW-5S
OW-5S
OW-5S
OW-5S
OW-5S
OW-5S
OW-5S
OW-5S
OW-5S
OW-5S
OW-5S
OW-6D
OW-6D
OW-6D
OW-6D
OW-6D
OW-6D
OW-6D
OW-6D
OW-6D
OW-6D
OW-6D
v1W-6D
OW-6D
OW-6D
OW-6D
OW-6D
OW-6D
OW-6D
OW-6D
OW-6D
OW-6S
OW-6S
OW-6S
15A NCAC 02L .0202(g) Grounc
Well Type
Hydrostratigraphic Unit
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Bedrock
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Voluntary
Transition (Saprolite)
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Bedrock
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Compliance
Transition (Saprolite)
Analytical Parameter Molydenum Nickel Nitrate as N Potassium Selenium Sodium Strontium Sulfate TDS Thallium TOC TSS Zinc
Units
water Quality Standard
Analytical Method
Sample Collection
Date
7/5/2011
11 /2/2011
11/4/2013
11 /15/2006
5/16/2007
11 /20/2007
5/21/2008
11 /24/2008
5/12/2009
11 /2/2009
5/25/2010
11 /4/2013
11 /15/2006
5/16/2007
11120/2007
5/21/2008
11 /24/2008
5/12/2009
11 /2/2009
5/25/2010
3/8/2011
7/5/2011
11 /2/2011
11 /4/2013
11 /14/2006
5/15/2007
11 /20/2007
5/21/2008
11 /24/2008
5/12/2009
11 /2/2009
5/25/2010
3/7/2011
7/5/2011
11/2/2011
3/7/2012
7/3/2012
11 /7/2012
3/6/2013
7/8/2013
11/4/2013
3/3/2014
7/1 /2014
11/3/2014
11 /14/2006
5/15/2007
11 /20/2007
pg/L
NE
200.8
Dissolved
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Total
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
pg/L
100
200.7
Dissolved
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Total
N/A
N/A
N/A
<2
2
<2
<2
<2
<1
<1
<1
N/A
<2
2
<2
<2
<2
<1
<1
<1
N/A
N/A
N/A
N/A
3.24
2
<2
<2
<2
<1
<1
<1
<5
<5
<5
<5
<5
<5
<5
<5
<5
<5
<5
N/A
5.33
5.62
6.09
mg -NIL
mg/L
pg/L
mg/L
10 NE 20 NE
300.0
200.7
200.8
200.7
Dissolved
Total
Total
Dissolved
Total
Dissolved
Total
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
0.02
N/A
2.25
N/A
<2
N/A
12.69
0.02
N/A
2.43
N/A
<2
N/A
12.799
<0.02
N/A
2.52
N/A
<2
N/A
12
0.02
N/A
2.35
N/A
<2
N/A
12.6
<0.23
N/A
1.71
N/A
<2
N/A
12.2
<0.02
N/A
1.85
N/A
<1
N/A
13.4
0.02
N/A
1.82
N/A
<1
N/A
13.7
<0.02
N/A
1.71
N/A
<1
N/A
12.8
N/A
N/A
N/A
N/A
N/A
N/A
N/A
0.04
N/A
1.31
N/A
<2
N/A
17.173
0.16
N/A
1.33
N/A
<2
N/A
17.486
<0.02
N/A
1.47
N/A
<2
N/A
17.4
0.34
N/A
1.18
N/A
<2
N/A
18.5
<0.23
N/A
1.14
N/A
<2
N/A
18.5
0.14
N/A
1.15
N/A
<1
N/A
19.1
0.05
N/A
1.21
N/A
<1
N/A
19.1
0.1
N/A
0.993
N/A
<1
N/A
17.3
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
0.68
N/A
1.74
N/A
<2
N/A
4.593
0.66
N/A
1.96
N/A
<2
N/A
4.544
0.64
N/A
1.85
N/A
<2
N/A
4.36
0.58
N/A
1.8
N/A
<2
N/A
4.87
0.52
N/A
1.89
N/A
<2
N/A
4.93
0.54
N/A
2.08
N/A
<1
N/A
5.51
0.51
N/A
2.11
N/A
<1
N/A
5.82
0.52
N/A
2
N/A
<1
N/A
5.46
0.55
N/A
N/A
N/A
<1
N/A
N/A
0.56
N/A
N/A
N/A
<1
N/A
N/A
0.53
N/A
N/A
N/A
<1
N/A
N/A
0.54
N/A
N/A
N/A
<1
N/A
N/A
0.53
N/A
N/A
N/A
<1
N/A
N/A
0.49
N/A
2.1
N/A
<1
N/A
5.86
0.49
N/A
2.15
N/A
<1
N/A
5.63
0.51
2.29
2.37
<1
<1
6.1
6.21
0.48
N/A
2.31
N/A
<1
N/A
6.08
0.52
N/A
2.36
N/A
<1
N/A
6.24
0.48
N/A
2.5
N/A
<1
N/A
6.14
N/A
N/A
N/A
N/A
N/A
N/A
N/A
0.33
N/A
0.48
N/A
<2
N/A
2.236
0.3
N/A
0.5
N/A
<2
N/A
2.262
0.36
N/A
0.54
N/A
<2
N/A
2.17
N/A
mg/L
mg/L
Ng/L
mg/L
NE 250 500 0.2* NE
N/A 300.0 2540C 200.8 5310E
Total
Total
Total
Dissolved
Total
Total
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
25.49
130
N/A
N/A
0.34
N/A
25.11
168
N/A
N/A
0.3
N/A
23.66
113
N/A
N/A
0.318
N/A
23
130
N/A
N/A
0.41
N/A
21
68
N/A
N/A
0.335
N/A
21
134
N/A
N/A
0.396
N/A
22
142
N/A
N/A
0.332
N/A
22
113
N/A
N/A
0.194
N/A
N/A
N/A
N/A
N/A
N/A
N/A
28.9
90
N/A
N/A
0.36
N/A
30.57
106
N/A
N/A
0.32
N/A
31.64
73
N/A
N/A
0.351
N/A
32
94
N/A
N/A
0.3
N/A
35
40
N/A
N/A
0.286
N/A
36
54
N/A
N/A
0.342
N/A
35
110
N/A
N/A
0.31
N/A
36
66
N/A
N/A
0.208
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
1.3
68
N/A
N/A
0.11
N/A
1.31
102
N/A
N/A
<0.1
N/A
1.43
48
N/A
N/A
<0.1
N/A
1.3
73
N/A
N/A
0.11
N/A
1.3
50
N/A
N/A
0.127
N/A
1.2
62
N/A
N/A
<0.1
N/A
1.2
78
N/A
N/A
0.121
N/A
1.1
94
N/A
N/A
<0.1
N/A
1.3
100
N/A
<0.2
N/A
N/A
1.4
97
N/A
<0.2
N/A
N/A
1.2
93
N/A
<0.2
N/A
N/A
1.3
106
N/A
<0.2
N/A
N/A
1.5
<250
N/A
<0.2
N/A
N/A
1.4
110
N/A
<0.2
N/A
N/A
1.4
120
N/A
<0.2
N/A
N/A
1.6
140
<0.2
<0.2
N/A
N/A
1.5
120
N/A
<0.2
N/A
N/A
0.17
120
N/A
<0.2
N/A
N/A
1.8
110
N/A
<0.2
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
0.18
24
N/A
N/A
0.3
N/A
0.23
36
N/A
N/A
0.15
N/A
0.2
55
N/A
N/A
0.228
mg/L
NE
2450D
Total
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
mg/L
1
200.7
Dissolved
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<0.005
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Total
N/A
N/A
N/A
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
N/A
-0.005
-0.005
0.007
-0.005
-0.005
0.006
-0.005
-0.005
N/A
N/A
N/A
N/A
0.017
0.006
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
,0.005
-0.005
-0.005
-0.005
-0.005
-0.005
,0.005
-0.005
-0.005
0.007
-0.005
N/A
0.023
0.006
0.009
Tables - Page 20

Table 4 - Groundwater Analytical Results
Well Name
OW-6S
OW-6S
OW-6S
OW-6S
OW-6S
VlW-6S
OW-6S
NW-6S
VlW-6S
NW-6S
VlW-6S
OW-6S
VlW-6S
VlW-6S
VlW-6S
OW-6S
VlW-6S
OW-7D
OW-7D
NW-7D
OW-7D
OW-7D
OW-7D
OW-7D
OW-7D
NW-7D
OW-7D
OW-7D
OW-7D
OW-7S
OW-7S
OW-7S
OW-7S
OW-7S
OW-7S
OW-7S
OW-7S
NW-7S
OW-7S
OW-7S
OW-7S
OW-8D
OW-8D
OW-8D
OW-8D
NW-8D
OW-8D
15A NCAC 02L .0202(g) Grounc
Well Type Hydrostratigraphic Unit
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Bedrock
Compliance Bedrock
Compliance Bedrock
Compliance Bedrock
Compliance Bedrock
Compliance Bedrock
Compliance Bedrock
Compliance Bedrock
Compliance Bedrock
Compliance Bedrock
Compliance Bedrock
Compliance Bedrock
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Transition (Saprolite)
Compliance Partially Weathered
Compliance Partially Weathered
Compliance Partially Weathered
Compliance Partially Weathered
Compliance Partially Weathered
Compliance Partially Weathered
Analytical Parameter Molydenum Nickel Nitrate as N Potassium Selenium Sodium Strontium Sulfate
Units
water Quality Standard
Analytical Method
Sample Collection
Date
5/21 /2008
11 /24/2008
5/12/2009
11 /2/2009
5/25/2010
3/7/2011
7/5/2011
11 /2/2011
3/7/2012
7/3/2012
11 /7/2012
3/6/2013
7/8/2013
11 /4/2013
3/3/2014
7/1 /2014
11 /3/2014
3/8/2011
7/5/2011
11 /2/2011
3/7/2012
7/3/2012
11 /7/2012
3/6/2013
7/8/2013
11/4/2013
3/3/2014
7/1 /2014
11 /3/2014
3/8/2011
7/5/2011
11 /2/2011
3/7/2012
7/3/2012
11 /7/2012
3/6/2013
7/8/2013
11 /4/2013
3/3/2014
7/1 /2014
11 /3/2014
3/7/2011
7/5/2011
11 /2/2011
3/7/2012
7/3/2012
11 /7/2012
pg/L
pg/L mg -NIL mg/L
NE 100
200.8
200.7
Dissolved
Total
Dissolved
Total
N/A
N/A
N/A
4.95
N/A
N/A
N/A
5.2
N/A
N/A
N/A
4.6
N/A
N/A
N/A
4.6
N/A
N/A
N/A
6.58
N/A
N/A
N/A
7
N/A
N/A
N/A
7
N/A
N/A
N/A
7
N/A
N/A
N/A
6
N/A
N/A
N/A
8
N/A
N/A
N/A
7
N/A
N/A
N/A
7
N/A
N/A
8
7
N/A
N/A
N/A
7
N/A
N/A
N/A
7
N/A
N/A
N/A
6
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
<5
N/A
N/A
N/A
<5
N/A
N/A
N/A
<5
N/A
N/A
N/A
<5
N/A
N/A
N/A
<5
N/A
N/A
N/A
<5
N/A
N/A
<5
<5
N/A
N/A
N/A
<5
N/A
N/A
N/A
<5
N/A
N/A
N/A
<5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
6
N/A
N/A
N/A
7
N/A
N/A
N/A
7
N/A
N/A
N/A
5
N/A
N/A
N/A
6
N/A
N/A
N/A
7
N/A
N/A
N/A
<5
N/A
N/A
<5
5
N/A
N/A
N/A
5
N/A
N/A
N/A
6
N/A
N/A
N/A
6
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<5
N/A
N/A
N/A
<5
N/A
N/A
N/A
<5
N/A
N/A
N/A
<5
N/A
N/A
N/A
<5
N/A
N/A
N/A
<5
10
300.0
Total
0.39
0.26
0.21
0.2
<0.02
<0.1
0.23
0.19
0.5
0.49
0.38
0.4
0.53
0.54
0.51
0.3
N/A
0.32
0.33
0.44
0.37
0.49
0.48
0.06
0.02
0.53
0.05
0.44
N/A
0.14
0.17
0.15
0.15
0.15
0.09
0.11
0.12
0.14
0.16
0.12
N/A
2.2
2.1
2.1
2.1
2.2
2.1
pg/L
mg/L
NE 20 NE
200.7
200.8
Dissolved
Total
200.7
Dissolved
Dissolved
Total
N/A
0.57
N/A
<2
N/A
N/A
0.51
N/A
<2
N/A
N/A
0.51
N/A
<1
N/A
N/A
0.486
N/A
<1
N/A
N/A
0.439
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
0.532
N/A
<1
N/A
N/A
0.512
N/A
<1
N/A
0.515
0.525
<1
<1
2.72
N/A
0.479
N/A
<1
N/A
N/A
0.511
N/A
<1
N/A
N/A
0.498
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
1.44
N/A
<1
N/A
N/A
0.814
N/A
<1
N/A
1.02
0.946
<1
<1
11.4
N/A
1.3
N/A
<1
N/A
N/A
0.7
N/A
<1
N/A
N/A
0.924
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
0.17
N/A
<1
N/A
N/A
0.12
N/A
<1
N/A
0.221
0.233
<1
<1
3.27
N/A
<0.1
N/A
<1
N/A
N/A
0.105
N/A
<1
N/A
N/A
0.123
N/A
<1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
N/A
N/A
<1
N/A
N/A
1.42
N/A
<1
N/A
Total
2.32
2.23
2.35
2.46
2.48
N/A
N/A
N/A
N/A
N/A
2.63
2.57
2.69
2.57
2.57
2.38
N/A
N/A
N/A
N/A
N/A
N/A
10.5
10.5
11.3
10.4
11.7
10.4
N/A
N/A
N/A
N/A
N/A
N/A
3.93
3.12
3.32
3.26
3.35
3.54
N/A
N/A
N/A
N/A
N/A
N/A
7.24
N/A
mg/L
TDS Thallium TOC TSS Zinc
mg/L pg/L mg/L mg/L mg/L
NE 250 500 0.2* NE NE
N/A
300.0
2540C
Total
200.8
Dissolved
5310E
2450D
Total
Total
Total
Total
Total
N/A
0.18
<10
N/A
N/A
0.24
N/A
N/A
<1
<20
N/A
N/A
0.64
N/A
N/A
0.3
24
N/A
N/A
0.212
N/A
N/A
0.18
<20
N/A
N/A
0.331
N/A
N/A
<0.1
<25
N/A
N/A
0.611
N/A
N/A
0.19
32
N/A
<0.2
N/A
N/A
N/A
0.19
39
N/A
<0.2
N/A
N/A
N/A
0.26
21
N/A
<0.2
N/A
N/A
N/A
0.18
33
N/A
<0.2
N/A
N/A
N/A
0.2
<250
N/A
<0.2
N/A
N/A
N/A
0.2
38
N/A
<0.2
N/A
N/A
N/A
0.21
47
N/A
<0.2
N/A
N/A
N/A
0.25
63
<0.2
<0.2
N/A
<5
N/A
0.24
50
N/A
<0.2
N/A
N/A
N/A
0.16
36
N/A
<0.2
N/A
N/A
N/A
0.14
32
N/A
<0.2
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
32
170
N/A
<0.2
N/A
N/A
N/A
14
130
N/A
<0.2
N/A
N/A
N/A
5
160
N/A
<0.2
N/A
N/A
N/A
8.1
110
N/A
<0.2
N/A
N/A
N/A
4.3
<250
N/A
<0.2
N/A
N/A
N/A
2.5
150
N/A
<0.2
N/A
N/A
N/A
8.8
100
N/A
<0.2
N/A
N/A
N/A
8.6
130
<0.2
<0.2
N/A
5
N/A
2.1
120
N/A
<0.2
N/A
N/A
N/A
6.7
110
N/A
<0.2
N/A
N/A
N/A
2.7
110
N/A
<0.2
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
3.4
95
N/A
<0.2
N/A
N/A
N/A
1.8
96
N/A
<0.2
N/A
N/A
N/A
2.4
110
N/A
<0.2
N/A
N/A
N/A
1.3
93
N/A
<0.2
N/A
N/A
N/A
0.94
<250
N/A
<0.2
N/A
N/A
N/A
2.4
96
N/A
<0.2
N/A
N/A
N/A
2.4
100
N/A
<0.2
N/A
N/A
N/A
1.5
120
<0.2
<0.2
N/A
<5
N/A
0.85
120
N/A
<0.2
N/A
N/A
N/A
0.85
98
N/A
<0.2
N/A
N/A
N/A
0.88
95
N/A
<0.2
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
5.9
120
N/A
<0.2
N/A
N/A
N/A
2.9
100
N/A
<0.2
N/A
N/A
N/A
2.4
130
N/A
<0.2
N/A
N/A
N/A
2.4
123
N/A
<0.2
N/A
N/A
N/A
2.1
<250
N/A
<0.2
N/A
N/A
N/A
2
120
N/A
<0.2
N/A
N/A
1
200.7
Dissolved
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
0.011
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
0.005
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
<0.005
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Total
0.012
0.006
0.007
-0.005
0.006
0.009
0.007
0.006
0.008
0.007
0.007
0.008
0.01
-0.005
0.014
-0.005
N/A
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
N/A
-0.005
-0.005
-0.005
,0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
N/A
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
Tables - Page 21

Table 4 - Groundwater Analytical Results
Analytical Parameter Molydenum Nickel Nitrate as N Potassium Selenium Sodium Strontium Sulfate TDS Thallium TOC TSS Zinc
Units
pg/L
pg/L
mg -NIL
mg/L
pg/L
mg/L
N/A
mg/L
mg/L
pg/L
mg/L
mg/L
mg/L
Quality Standard
NE
100
1
15A
NCAC 02L .0202(g) Groundwater
10
NE
20
NE
200.7
NE
250
500
0.2*
NE
NE
Analytical Method
200.8
200.7
300.0
200.7
200.8
N/A
300.0
2540C
200.8
5310E
2450D
200.7
Well Name
Well Type
Dissolved
Total
Hydrostratigraphic Unit
Sample Collection
Date
Dissolved
Total
Dissolved
Total
Total
Dissolved
Total
Dissolved
Total
Total
Total
Total
Dissolved
Total
Total
Total
Dissolved
Total
MW-81D
Compliance
Partially Weathered
3/6/2013
N/A
N/A
N/A
<5
2.1
N/A
1.35
N/A
<1
N/A
6.72
N/A
2.1
120
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-81D
Compliance
Partially Weathered
7/8/2013
N/A
N/A
<5
<5
2.2
1.4
1.45
<1
<1
7.22
7.37
N/A
2.1
130
<0.2
<0.2
N/A
<5
<0.005
<0.005
MW-81D
Compliance
Partially Weathered
11/4/2013
N/A
N/A
N/A
<5
2.1
N/A
1.34
N/A
<1
N/A
6.98
N/A
1.8
120
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-81D
Compliance
Partially Weathered
3/3/2014
N/A
N/A
N/A
<5
2.2
N/A
1.46
N/A
<1
N/A
7.38
N/A
2.1
110
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-81D
Compliance
Partially Weathered
7/1/2014
N/A
N/A
N/A
<5
2.2
N/A
1.38
N/A
<1
N/A
7.14
N/A
2
120
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-81D
Compliance
Partially Weathered
11/3/2014
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
MW-8S
Compliance
Transition (Saprolite)
3/7/2011
N/A
N/A
N/A
<5
0.71
N/A
N/A
N/A
<1
N/A
N/A
N/A
12
150
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-8S
Compliance
Transition (Saprolite)
7/5/2011
N/A
N/A
N/A
<5
1.2
N/A
N/A
N/A
<1
N/A
N/A
N/A
3.7
120
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-8S
Compliance
Transition (Saprolite)
11/2/2011
N/A
N/A
N/A
<5
1.1
N/A
N/A
N/A
<1
N/A
N/A
N/A
3.2
150
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-8S
Compliance
Transition (Saprolite)
3/7/2012
N/A
N/A
N/A
6
0.69
N/A
N/A
N/A
<1
N/A
N/A
N/A
4.8
134
N/A
<0.2
N/A
N/A
N/A
0.007
MW-8S
Compliance
Transition (Saprolite)
7/3/2012
N/A
N/A
N/A
<5
1.1
N/A
N/A
N/A
<1
N/A
N/A
N/A
3
<250
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-8S
Compliance
Transition (Saprolite)
11/7/2012
N/A
N/A
N/A
<5
1.1
N/A
0.972
N/A
<1
N/A
8.16
N/A
2.7
140
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-8S
Compliance
Transition (Saprolite)
3/6/2013
N/A
N/A
N/A
<5
1.2
N/A
0.925
N/A
<1
N/A
7.38
N/A
7
150
N/A
<0.2
N/A
N/A
N/A
0.007
MW-8S
Compliance
Transition (Saprolite)
7/8/2013
N/A
N/A
<5
7
1.5
0.847
1.1
<1
<1
7.2
7.44
N/A
3.7
150
<0.2
<0.2
N/A
130
<0.005
0.011
MW-8S
Compliance
Transition (Saprolite)
11/4/2013
N/A
N/A
N/A
10
1.6
N/A
1.2
N/A
<1
N/A
7.24
N/A
1.7
130
N/A
<0.2
N/A
N/A
N/A
0.009
MW-8S
Compliance
Transition (Saprolite)
3/3/2014
N/A
N/A
N/A
9
1.5
N/A
1.2
N/A
<1
N/A
7.58
N/A
2.9
130
N/A
<0.2
N/A
N/A
N/A
0.011
MW-8S
Compliance
Transition (Saprolite)
7/1/2014
N/A
N/A
N/A
<5
1.4
N/A
0.986
N/A
<1
N/A
7.69
N/A
2
130
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-8S
Compliance
Transition (Saprolite)
11/3/2014
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
MW-91D
Compliance
Bedrock
3/7/2011
N/A
N/A
N/A
<5
0.19
N/A
N/A
N/A
<1
N/A
N/A
N/A
10
160
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-9D
Compliance
Bedrock
7/5/2011
N/A
N/A
N/A
<5
0.19
N/A
N/A
N/A
<1
N/A
N/A
N/A
8.8
140
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-91D
Compliance
Bedrock
11/2/2011
N/A
N/A
N/A
<5
0.17
N/A
N/A
N/A
<1
N/A
N/A
N/A
9.2
170
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-9D
Compliance
Bedrock
3/7/2012
N/A
N/A
N/A
<5
0.17
N/A
N/A
N/A
<1
N/A
N/A
N/A
9.1
157
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-91D
Compliance
Bedrock
7/3/2012
N/A
N/A
N/A
<5
0.17
N/A
N/A
N/A
<1
N/A
N/A
N/A
9.3
<250
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-9D
Compliance
Bedrock
11/7/2012
N/A
N/A
N/A
<5
0.14
N/A
0.513
N/A
<1
N/A
9.58
N/A
10
160
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-91D
Compliance
Bedrock
3/7/2013
N/A
N/A
N/A
<5
0.17
N/A
0.521
N/A
<1
N/A
9.08
N/A
13
170
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-9D
Compliance
Bedrock
7/9/2013
N/A
N/A
<5
<5
0.17
0.505
0.521
<1
<1
9.46
9.64
N/A
15
170
<0.2
<0.2
N/A
<5
<0.005
<0.005
MW-91D
Compliance
Bedrock
11/5/2013
N/A
N/A
N/A
<5
0.19
N/A
0.493
N/A
<1
N/A
9.88
N/A
16
170
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-9D
Compliance
Bedrock
3/4/2014
N/A
N/A
N/A
<5
0.25
N/A
0.545
N/A
<1
N/A
10.2
N/A
22
180
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-91D
Compliance
Bedrock
7/1/2014
N/A
N/A
N/A
<5
0.26
N/A
0.512
N/A
<1
N/A
10.2
N/A
26
180
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-91D
Compliance
Bedrock
11/3/2014
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
MW-9S
Compliance
Transition (Saprolite)
3/7/2011
N/A
N/A
N/A
<5
0.16
N/A
N/A
N/A
<1
N/A
N/A
N/A
10
150
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-9S
Compliance
Transition (Saprolite)
7/5/2011
N/A
N/A
N/A
<5
0.15
N/A
N/A
N/A
<1
N/A
N/A
N/A
11
150
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-9S
Compliance
Transition (Saprolite)
11/2/2011
N/A
N/A
N/A
<5
0.17
N/A
N/A
N/A
<1
N/A
N/A
N/A
10
170
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-9S
Compliance
Transition (Saprolite)
3/7/2012
N/A
N/A
N/A
<5
0.13
N/A
N/A
N/A
<1
N/A
N/A
N/A
13
137
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-9S
Compliance
Transition (Saprolite)
7/3/2012
N/A
N/A
N/A
<5
0.19
N/A
N/A
N/A
<1
N/A
N/A
N/A
15
<250
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-9S
Compliance
Transition (Saprolite)
11/7/2012
N/A
N/A
N/A
<5
0.19
N/A
0.26
N/A
<1
N/A
9.38
N/A
14
150
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-9S
Compliance
Transition (Saprolite)
3/7/2013
N/A
N/A
N/A
<5
0.19
N/A
0.192
N/A
<1
N/A
7.98
N/A
18
170
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-9S
Compliance
Transition (Saprolite)
7/9/2013
N/A
N/A
<5
<5
0.27
0.233
0.226
<1
<1
9.24
9.54
N/A
25
190
<0.2
<0.2
N/A
<5
<0.005
<0.005
MW-9S
Compliance
Transition (Saprolite)
11/5/2013
N/A
N/A
N/A
<5
0.37
N/A
0.255
N/A
<1
N/A
9.89
N/A
26
180
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-9S
Compliance
Transition (Saprolite)
3/4/2014
N/A
N/A
N/A
<5
0.41
N/A
0.208
N/A
<1
N/A
8.94
N/A
30
180
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-9S
Compliance
Transition (Saprolite)
7/1/2014
N/A
N/A
N/A
<5
0.55
N/A
0.267
N/A
<1
N/A
9.58
N/A
33
190
N/A
<0.2
N/A
N/A
N/A
<0.005
MW-9S
Compliance
Transition (Saprolite)
11/3/2014
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Tables - Page 22

Table 4 - Groundwater Analytical Results
Notes:
1. Depth to Water measured from the top of well casing.
2. Analytical parameter abbreviations:
Temp. = Temperature
DO = Dissolved oxygen
Cond. = Specific conductivity
ORP = Oxidation reduction potential
TDS = Total dissolved solids
TSS = Total suspended solids
TOC = Total organic carbon
3. Units:
°C = Degrees Celsius
SU = Standard Units
my = millivolts
NTU = Nephelometric Turbidity Unit
mg/L = milligrams per liter
pg/L = micrograms per liter
pmhos/cm = micromhos per centimeter
CaCO3 = calcium carbonate
HCO3 = bicarbonate
C032- = carbonate
4. N/A = Not applicable
5. NE = Not established
6. " Interim Maximum Allowable Concentration (IMAC) standards
7. Highlighted values indicate values that exceed the 15A NCAC 2L Standard
8. Analytical results with "<" preceding the result indicates that the parameter was not
detected at a concentration which attains or exceeds the laboratory reporting limit.
Tables - Page 23

Table 5 - Soil and Ash Analytical Results
Analytical Parameter pH Antimony Arsenic Barium Boron Cadmium Chromium Copper Iron Lead Manganese Mercury Nickel Selenium Thallium Zinc
Units SU mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg
IHSB Protection of Groundwater PSRG NE 0.9 5.8 580 45 3 3.8 700 150 270 65 1 130 2.1 0.28 1,200
IHSB Industrial Health -Based PSRG NE 82 2.4 38,000 40,000 160 6 8,200 100,000 800 4,600 3.1 4,000 1,000 2 62,000
Analytical Method Field 200.8 200.8 200.7 200.7 200.8 200.7 200.7 200.7 200.8 200.8 245.1 200.7 200.8 200.8 200.7
Sample Name and Depth
Source
Location
Sample Collection Date
BC-11/12 (24-26')
Ash
Divider Dike Cell 2/3
10/[23-28]/13
8.9
69.2
0.0900
7.10
2.00
<0.51
11.1
<0.57
20.50
284.0
<5.7
<0.110
10.7
15.8
4,460
4.60
BC-11/12 (49-51')
Ash
Divider Dike Cell 2/3
10/[23-28]/13
9.8
0.96
47.20
336.0
10.8
<0.150
13.0
26.0
4,930
8.10
64.4
0.1100
9.60
2.90
<0.50
12.5
BC-15 (19-21')
Ash
Cell 2
10/[23-28]/13
6.7
0.72
35.70
249.0
14.2
0.110
13.4
51.4
5,720
14.50
73.0
0.0130
15.40
<1.10
0.57
29
BC-15 (34-36')
Ash
Cell 2
10/[23-28]/13
7.9
1.60
54.60
422.0
12.3
<0.120
11.9
46.4
6,320
11.50
119.0
0.0230
12.30
<1.20
<0.51
24.1
BC-17 (1-3')
Ash
Within Ash Storage Area (East of Cell 1)
10/8/2013
6.0
0.87
25.60
210.0
9.7
<0.120
9.9
34.4
6,280
9.90
70.4
0.0190
11.80
2.10
<0.52
16.5
BC-17 (9-9.8')
Ash
Within Ash Storage Area (East of Cell 1)
10/8/2013
6.5
0.95
201.00
288.0
<5.9
6,100
15.0
26.5
53,300
10.30
150.0
0.0440
18.90
10.10
<0.52
26.3
BC-18 (4-6')
Ash
Within Ash Storage Area (East of Cell 1)
10/8/2013
6.8
1.20
22.50
241.0
11.4
<0.140
8.3
33.2
5,600
9.10
86.2
0.0160
10.90
2.50
<0.49
15.2
BC-18 (14-16')
Ash
Within Ash Storage Area (East of Cell 1)
10/8/2013
6.5
0.99
11.70
166.0
19.6
<0.130
11.9
42.0
6,860
11.90
92.5
0.0210
14.50
2.70
<0.50
20.9
BC-19 (9-11')
Ash
Within Ash Storage Area (East of Cell 1)
10/[7,17]/13
7.1
0.98
26.10
281.0
17
<0.130
9.5
39.4
4,920
10.80
43.0
0.0140
12.30
3.00
<0.48
17.9
BC-19 (14-16')
Ash
Within Ash Storage Area (East of Cell 1)
10/[7,17]/13
7.5
1.00
16.40
164.0
11.7
<0.120
6.0
27.8
2,760
6.80
32.8
0.0160
8.50
2.50
<0.50
10.4
BC-20D (14-16')
Ash
North Portion of Cell 1
10/[7,17]/13
8.2
0.95
14.60
96.7
17.3
0.200
7.9
31.8
2,930
9.10
17.3
0.0190
11.70
1.50
<0.51
11.3
BC-20D (24-26')
Ash
North Portion of Cell 1
10/[7,17]/13
8.3
1.40
31.70
336.0
20.6
0.540
16.8
49.5
9,960
11.00
58.5
0.0360
18.10
5.20
<0.48
15.3
BC-30D (9-11')
Ash
West of Cell 3
10/[7,17]/13
7.8
1.10
36.20
553.0
10.9
0.540
11.3
28.7
8,380
9.10
70.0
0.0082
11.80
<0.89
<0.52
16.7
BC-30D (24-26')
Ash
West of Cell 3
10/[7,17]/13
8.3
0.49
16.50
270.0
<4.0
0.430
12.0
19.4
15,000
1.40
121.0
0.0230
9.90
<0.80
<0.51
5.5
BC-11/12 (89-91')
Soil
Divider Dike Cell 2/3
10/[23-28]/13
7.2
<0.49
<0.98
216.0
<4.9
<0.098
14.7
17.7
7,800
2.00
327.0
<0.0048
32.80
<0.98
<0.49
23.3
BC-15 (49-51')
Soil
Cell 2
10/[23-28]/13
6.2
<0.51
<1.00
47.5
<5.1
<0.100
1.3
27.8
18,000
2.50
260.0
0.0380
1.60
<1.0
<0.53
19.9
BC-17 (29-31')
Soil
Within Ash Storage Area (East of Cell 1)
10/8/2013
5.6
<0.65
<1.30
380.0
<6.5
16.100
8.3
42.6
92,300
15.80
3180.0
0.0190
2.00
4.40
<0.50
92
BC-18 (24-26')
Soil
Within Ash Storage Area (East of Cell 1)
10/8/2013
5.6
<0.66
<1.30
214.0
<6.6
7.700
3.8
11.8
61,400
10.50
794.0
0.0078
<0.66
6.20
<0.48
89.4
BC-19 (29-31')
Soil
Within Ash Storage Area (East of Cell 1)
10/[7,17]/13
3.9
<0.65
<1.30
182.0
<6.5
6.100
2.1
6.8
53,300
8.60
798.0
0.0082
<0.65
3.50
<0.49
45
BC-20D (35-36')
Soil
North Portion of Cell 1
10/[7,17]/13
7.7
1.50
2.50
192.0
<5.4
0.900
1.1
32.2
56,800
1.20
601.0
0.0063
2.60
<1.10
<0.49
97.8
BC-30D (39-41')
Soil
West of Cell 3
10/[7,17]/13
9.8
0.66
3.20
192.0
<5.0
0.320
7.0
4.7
22,000
1.40
375.0
0.0072
4.90
<1.00
<0.50
55
BG-1 (9-11')
Soil
North of Cell 1 and West of Cell 3
10/[7-17]/13
5.4
1.20
<1.10
42.0
<5.3
1.300
<0.53
53.1
54,200
<0.53
405.0
0.0120
1.50
<1.10
<0.49
17.3
BG-1 (19-21')
Soil
North of Cell 1 and West of Cell 3
10/[7-17]/13
5.3
1.10
<1.40
159.0
<7.1
1.300
<0.71
64.5
73,100
1.30
930.0
0.0110
6.80
<1.40
<0.51
77.9
BG-1 (29-31')
Soil
North of Cell 1 and West of Cell 3
10/[7-17]/13
6.1
1.00
<1.20
185.0
<5.8
1.000
<0.58
42.0
65,700
1.10
936.0
<0.0044
4.90
<1.20
<0.50
90.5
BG-2 (9-11')
Soil
Southeast of Cell 1 and South of Cell 2
10/[7-17]/13
6.6
<0.57
<1.10
18.5
<5.7
0.140
3.3
5.5
9,300
9.20
179.0
0.0059
1.80
<1.10
<0.48
14.3
BG-2 (19-21')
Soil
Southeast of Cell 1 and South of Cell 2
10/[7-17]/13
5.8
<0.66
4.50
91.1
<6.6
0.630
10.8
49.7
44,900
1.90
543.0
0.0140
16.40
<1.30
<0.51
24.8
BG-2 (29-31')
Soil
Southeast of Cell 1 and South of Cell 2
10/[7-17]/13
7.1
<0.51
1.40
69.2
<5.1
<0.100
6.0
9.9
7,660
5.50
227.0
<0.0057
5.10
<1.00
<0.48
18.7
BG-3 (14-16')
Soil
Southwest of Cell 1
10/[7-17]/13
5.4
<0.69
<1.40
72.5
<6.9
10.200
261.0
133.0
70,200
6.20
303.0
<0.0049
184.00
3.80
<0.50
41.2
BG-3 (19-21')
Soil
Southwest of Cell 1
10/[7-17]/13
5.0
<0.70
<1.40
60.4
<7.0
12.600
154.0
125.0
81,100
7.70
864.0
<0.0077
166.00
4.50
<0.52
48.7
BG-3 (29-31')
Soil
Southwest of Cell 1
10/[7-17]/13
5.0
<0.96
<1.90
90.6
<9.6
7.900
130.0
122.0
73,000
6.70
1560.0
<0.0072
211.00
4.50
<0.50
44.9
Tables - Page 24

Table 5 - Soil and Ash Analytical Results
Notes:
1. Units:
SU = Standard Units
mg/kg = milligrams per kilogram
2. N/A = Not applicable
3. NE = Not established
4. Sample depth interval in parentheses
Tables - Page 25

Table 6 - Surface Water Analytical Results
Analytical Parameter Temp.
DO Cond. pH ORP Turbidity Alkalinity
Aluminum
Antimony
Arsenic
Barium
Beryllium
Boron
Cadmiu
Units C
mg/L pmhos SU my NTU mg/L CaCO3
pg/L
Ng/L
pg/L
pg/L
pg/L
pg/L
pg/L
15A NCAC 02B .0200 Surface Water Quality Standard NA
NA NA 6.0 - 9.0 NA NA NE
87
5.6
10
1000
6.5
NE
2
Analytical Method
2320B4d
N/A
200.8
200.8
200.7
N/A
200.7
200.8
Well Name Location Sample Collection Date
Field Measurements
Total N/A Dissolved Total Dissolved Total Dissolved Total N/A Dissolved Total Dissolved
AB-S1 DUP
Cell 3
10/30/13, 11/01/13
22.8
N/A
517
7.00
N/A
6.00
45.3
N/A
2.1
2.10
23.1
26.2
0.0998
0.1160
N/A
200
237
<0.1
AB-S2
Cell 3
10/30/13, 11/01/13
17.5
N/A
304
7.20
N/A
28.00
50.6
N/A
1.7
1.80
11.1
14.9
0.0909
0.1100
N/A
127
135
<0.1
AB-S2 DUP
Cell 3
10/30/13, 11/01/13
17.5
N/A
304
7.20
N/A
28.00
50.8
N/A
1.6
1.80
10.9
15.3
0.0917
0.1100
N/A
127
134
<0.1
AB-S3
Cell 2
10/30/13, 11/01/13
18.0
N/A
504
7.20
N/A
24.00
49.1
N/A
2.7
2.80
25.0
25.8
0.0752
0.0911
N/A
193
202
<0.1
AB-S4
Cell 2
10/30/13, 11/01/13
18.1
N/A
478
7.40
N/A
89.00
48.6
N/A
2.5
2.50
26.4
26.9
0.0692
0.0941
N/A
179
198
<0.1
AB-S5
Cell 1
10/30/13, 11/01/13
19.3
N/A
536
7.30
N/A
26.00
68.2
N/A
1.8
1.90
22.6
31.0
0.1400
0.1630
N/A
178
192
<0.1
Tower-0.3m
Tower
3/7/2013
N/A
11.93
262
7.28
281
7.30
N/A
N/A
N/A
3.30
N/A
15.9
N/A
85.00
N/A
N/A
177
N/A
Tower-0.3m
Tower
7/9/2013
N/A
6.38
357
7.58
291
5.78
N/A
N/A
2.5
2.17
50.9
50.3
88.00
91.00
N/A
190
193
<1
Tower-0.3m
Tower
11/4/2013
N/A
8.63
510
7.72
280
16.20
N/A
N/A
N/A
2.79
N/A
18.2
N/A
113.00
N/A
N/A
191
N/A
Tower-0.3m
Tower
3/4/2014
N/A
13.82
375
8.89
248
11.80
N/A
N/A
N/A
2.85
N/A
22.7
N/A
88.00
N/A
N/A
173
N/A
Tower-0.3m
Tower
7/1/2014
N/A
12.67
529
9.27
240
17.80
N/A
N/A
N/A
4.79
N/A
75.0
N/A
81.00
N/A
N/A
244
N/A
Tower-0.3m
Tower
11/3/2014
N/A
8.40
600
7.87
414
10.90
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Tables - Page 26

Table 6 - Surface Water Analytical Results
Analytical Parameter m
Calcium
Chloride
Chromium
Cobalt
Copper
Iron
Lead
Magnesium
Manganese
Mercury
Units
mg/L
mg/L
Ng/L
pg/L
mg/L
pg/L
pg/L
pg/L
pg/L
pg/L
15A NCAC 02B .0200 Surface Water Quality Standard
NE
230
50
3
7
1000
25
NE
200
0.012
Analytical Method
200.7
300
200.7
200.8
200.7
200.7
200.8
200.7
200.8
245.1
Well Name Location Sample Collection Date Total
Dissolved Total
Total
Dissolved Total
Dissolved Total
Dissolved Total
Dissolved Total
Dissolved Total
Dissolved Total
Dissolved Total
Dissolved Total
AB-S1 DUP
Cell 3
10/30/13, 11/01/13
<0.1
N/A
23.6
42.8
<5
<5
N/A
N/A
<5
<5
<0.05
0.118
<1
<1
N/A
7.32
12.0
75.3
<0.2
<0.2
AB-S2
Cell 3
10/30/13, 11/01/13
<0.1
N/A
15.8
23.2
<5
<5
N/A
N/A
<5
<5
<0.05
0.322
<1
<1
N/A
5.00
56.9
160.0
<0.2
<0.2
AB-S2 DUP
Cell 3
10/30/13, 11/01/13
<0.1
N/A
15.9
23.3
<5
<5
N/A
N/A
<5
<5
<0.05
0.295
<1
<1
N/A
5.04
60.4
157.0
<0.2
<0.2
AB-S3
Cell 2
10/30/13, 11/01/13
<0.1
N/A
24.0
46.7
<5
<5
N/A
N/A
<5
<5
0.137
0.374
<1
<1
N/A
7.91
146.0
180.0
<0.2
<0.2
AB-S4
Cell 2
10/30/13, 11/01/13
<0.1
N/A
23.3
43.5
<5
<5
N/A
N/A
<5
<5
0.110
0.511
<1
1.7
N/A
7.74
69.2
112.0
<0.2
<0.2
AB-S5
Cell 1
10/30/13, 11/01/13
<0.1
N/A
24.7
47.1
<5
<5
N/A
N/A
<5
<5
0.230
0.808
<1
<1
N/A
7.44
213.0
255.0
<0.2
<0.2
Tower-0.3m
Tower
3/7/2013
<1.0
N/A
15.7
17.0
N/A
<5
N/A
N/A
N/A
<0.005
N/A
223
N/A
<1
N/A
4.26
N/A
45.0
N/A
N/A
Tower-0.3m
Tower
7/9/2013
<1.0
15.8
15.7
31.0
<5
<5
N/A
N/A
<0.005
<0.005
29.00
121
<1
<1
5.75
5.71
21.0
63.0
N/A
<0.05
Tower-0.3m
Tower
11/4/2013
<1.0
N/A
22.7
42.0
N/A
<5
N/A
N/A
N/A
<0.005
N/A
257
N/A
<1
N/A
7.52
N/A
148.0
N/A
N/A
Tower-0.3m
Tower
3/4/2014
<1.0
N/A
25.5
28.0
N/A
<5
N/A
N/A
N/A
N/A
N/A
384
N/A
<1
N/A
7.86
N/A
72.0
N/A
N/A
Tower-0.3m
Tower
7/1/2014
<1.0
N/A
29.4
45.0
N/A
<5
N/A
N/A
N/A
<0.005
N/A
169
N/A
<1
N/A
9.54
N/A
21.0
N/A
N/A
Tower-0.3m
Tower
11/3/2014
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Tables - Page 27

Table 6 - Surface Water Analytical Results
Analytical Parameter
Molydenum
Nickel
Nitrate as N
Potassium
Selenium
Sodium
Strontium
Sulfate
TDS
Thallium
TOC
TSS
Zinc
Units
Ng/L
Ng/L
mg -NIL
mg/L
Ng/L
mg/L
mg/L
mg/L
mg/L
Ng/L
mg/L
mg/L
mg/L
15A NCAC 02B .0200 Surface Water Quality Standard
160
25
10
NE
5
NE
14
250
500
0.24
NE
NE
0.05
Analytical Method
200.8
200.7
300.0
200.7
200.8
200.7
N/A
300.0
2540C
200.8
5310B
2450D
200.7
Well Name Location Sample Collection Date
Dissolved Total
Dissolved Total
Total
Dissolved Total
Dissolved Total
Dissolved Total
N/A
Total
N/A
Dissolved Total
N/A
Total
Dissolved Total
AB-S1 DUP
Cell 3
10/30/13, 11/01/13
N/A
N/A
<5
<5.0
0.085
N/A
14.90
1.10
1.20
N/A
64.1
N/A
130.0
332
<0.200
<0.200
N/A
N/A
<10
<10
AB-S2
Cell 3
10/30/13, 11/01/13
N/A
N/A
<5
<5.0
<0.02
N/A
9.68
1.00
<1
N/A
33.9
N/A
58.5
242
<0.200
<0.200
N/A
N/A
<10
<10
AB-S2 DUP
Cell 3
10/30/13, 11/01/13
N/A
N/A
<5
<5.0
0.0256
N/A
9.87
1.10
<1
N/A
34.2
N/A
58.6
241
<0.200
<0.200
N/A
N/A
<10
<10
AB-S3
Cell 2
10/30/13, 11/01/13
N/A
N/A
<5
5.9
0.660
N/A
11.80
1.70
1.50
N/A
60.6
N/A
129.0
378
<0.200
<0.200
N/A
N/A
<10
<10
AB-S4
Cell 2
10/30/13, 11/01/13
N/A
N/A
<5
5.8
0.742
N/A
11.50
1.50
1.40
N/A
57.5
N/A
116.0
351
<0.200
<0.200
N/A
N/A
<10
<10
AB-S5
Cell 1
10/30/13, 11/01/13
N/A
N/A
<5
6.0
<0.02
N/A
15.60
<1
<1
N/A
63.4
N/A
123.0
377
<0.2
<0.2
N/A
N/A
<10
<10
Tower-0.3m
Tower
3/7/2013
N/A
N/A
N/A
<5.0
0.460
N/A
5.91
N/A
1.21
N/A
20.5
N/A
62.0
170
N/A
0.282
N/A
N/A
N/A
<0.005
Tower-0.3m
Tower
7/9/2013
N/A
N/A
<5
<5.0
<0.023
6.12
6.17
1.35
1.16
39.5
39.5
N/A
70.0
220
<0.200
<0.200
N/A
<5
<0.005
<0.005
Tower-0.3m
Tower
11/4/2013
N/A
N/A
N/A
6.0
0.230
N/A
10.60
N/A
1.25
N/A
59.3
N/A
120.0
330
N/A
<0.200
N/A
N/A
N/A
<0.005
Tower-0.3m
Tower
3/4/2014
N/A
N/A
N/A
<5.0
0.280
N/A
7.84
N/A
1.02
N/A
36.5
N/A
89.0
260
N/A
<0.200
N/A
N/A
N/A
0.006
Tower-0.3m
Tower
7/1/2014
N/A
N/A
N/A
<5.0
<0.023
N/A
9.95
N/A
1.38
N/A
59.1
N/A
120.0
350
N/A
<0.200
N/A
N/A
N/A
<0.005
Tower-0.3m
Tower
11/3/2014
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Tables - Page 28

Table 6 - Surface Water Analytical Results
Notes:
1. Analytical parameter abbreviations:
Temp. = Temperature
DO = Dissolved oxygen
Cond. = Specific conductance
ORP = Oxidation reduction potential
TDS = Total dissolved solids
TSS = Total suspended solids
TOC = Total organic carbon
2. Units:
°C = Degrees Celsius
SU = Standard Units
my = millivolts
pS = microsiemens
NTU = Nephelometric Turbidity Unit
mg/L = milligrams per liter
ug/L = micrograms per liter
CaCO3 = calcium carbonate
3. N/A = Not applicable
4. NE = Not established
5. Highlighted values indicate values that exceed the 15A NCAC 2B Standard
6. Analytical results with "<" preceding the result indicates that the parameter was not
detected at a concentration which attains or exceeds the laboratory reporting limit.
Tables - Page 29

Table 7 - Ash Basin Pore Water Analytical Results
Analytical Parameter Temp.
Cond. pH Turbidity Alkalinity
Aluminum
Antimony*
Arsenic
Barium
Beryllium*
Boron
Cadmium
Calcium
Chloride
Units C
Nmhos SU NTU mg/L CaCO3
mg/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
mg/L
mg/L
15A NCAC 02L .0202(g) Groundwater Quality Standard NE
NE 6.5 - 8.5 NE NE
NE
1
10
700
4
700
2
NE
250
Analytical Method
2320134d
N/A
200.8
200.8
200.7
N/A
200.7
200.8
200.7
300
Well Name Location Sample Collection Date Field Measurements Total N/A Dissolved Total Dissolved Total Dissolved Total N/A Dissolved Total Dissolved Total Dissolved Total Total
BC-18
Wells Inside Waste Boundary
10/[30,31]/13
19.2
29
4.8
322
8
N/A
<1.0
<1.0
<1
<10
58.2
116
N/A
<50
<50
<0.1
<1
N/A
0.691
<5
BC-20S
Wells Inside Waste Boundary
10/[30,31]/13
21.8
607
6.5
8
141
N/A
11.0
10.9
116
117
140
164
N/A
782
871
<0.1
<0.1
N/A
60.8
28.6
BC-20D
Wells Inside Waste Boundary
10/[30,31]/13
19.9
579
8.1
9
90
N/A
1.3
1.3
263
255
87.5
105
N/A
593
652
<0.1
<0.1
N/A
38.7
45.1
BC-30S
Wells Inside Waste Boundary
10/[30,31]/13
18.1
660
7.0
9
243
N/A
<1.0
<1.0
666
670
195
233
N/A
363
426
<0.1
<0.1
N/A
91.7
12.5
BC-30S DUP
Wells Inside Waste Boundary
10/[30,31]/13
18.1
660
7.0
9
231
N/A
<1.0
<1.0
659
674
194
234
N/A
366
414
<0.1
<0.1
N/A
90.5
12.8
BC-30D-2
Wells Inside Waste Boundary
10/[30,31]/13
18.9
1 554
8.1
9
192
N/A
<1.0
<1.0
290
303
262
305
N/A
298
332
<0.1
<0.1
N/A
76.9
10.4
Tables - Page 30

Table 7 - Ash Basin Pore Water Analytical Results
Analytical Parameter
Chromium
Cobalt*
Copper
Iron
Lead
Magnesium
Manganese
Mercury
Molydenum
Nick
Units
ug/L
ug/L
mg/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ugh
15A NCAC 02L .0202(g) Groundwater Quality Standard
10
1
1
300
15
NE
50
1
NE
10(
Analytical Method
200.7
200.8
200.7
200.7
200.8
200.7
200.8
245.1
200.8
200.
Well Name Location Sample Collection Date
Dissolved Total
Dissolved Total
Dissolved Total
Dissolved Total
Dissolved Total
Dissolved Total
Dissolved Total
Dissolved Total
Dissolved Total
Dissolved
BC-18
Wells Inside Waste Boundary
10/[30,31]/13
<5
40.1
N/A
N/A
<0.005
0.005
108
8,000
<1
2.5
N/A
2.1
147
352
<0.2
<0.2
N/A
N/A
<5
BC-20S
Wells Inside Waste Boundary
10/[30,31]/13
<5
<5
N/A
N/A
<0.005
<0.005
<50
81.9
<1
<1
N/A
12
104
120
<0.2
<0.2
N/A
N/A
11
BC-20D
Wells Inside Waste Boundary
10/[30,31]/13
<5
<5
N/A
N/A
<0.005
<0.005
<50
165
<1
<1
N/A
6.89
52.4
60.7
<0.2
<0.2
N/A
N/A
<5
BC-30S
Wells Inside Waste Boundary
10/[30,31]/13
<5
<5
N/A
N/A
<0.005
<0.005
7,630
9,290
<1
<1
N/A
17.1
2,840
3,410
<0.2
<0.2
N/A
N/A
<5
BC-30S DUP
Wells Inside Waste Boundary
10/[30,31]/13
<5
<5
N/A
N/A
<0.005
<0.005
7,770
9,100
<1
<1
N/A
16.8
2,840
3,340
<0.2
<0.2
N/A
N/A
<5
BC-30D-2
Wells Inside Waste Boundary
10/[30,31]/13
<5
<5
N/A
N/A
<0.005
1 <0.005
371
612
<1
<1
N/A
17.4
606
678
<0.2
<0.2
N/A
N/A
<5
Tables - Page 31

Table 7 - Ash Basin Pore Water Analytical Results
Analytical Parameter el
Nitrate as h
Potassium
Selenium
Sodium
Strontium
Sulfate
TDS
Thallium"
TOC
TSS
Zinc
Units -
mg-N/L
mg/L
ug/L
mg/L
ug/L
mg/L
mg/L
ug/L
mg/L
mg/L
mg/L
15A NCAC 02L .0202(g) Groundwater Quality Standard 1
10
NE
20
NE
NE
250
500
0.2
N/A
NE
1
Analytical Method 7
300.0
200.7
200.8
200.7
N/A
300.0
2540C
200.8
5310B
N/A
200.7
Well Name Location Sample Collection Date Total
Total
Dissolved Total
Dissolved Total
Dissolved Total
N/A
Total
Total
Dissolved Total
Total
Total
Dissolved Total
BC-18
Wells Inside Waste Boundary
10/[30,31]/13
21.5
<0.0200
N/A
<5.00
<1.0
<10.0
N/A
<5.0
N/A
5
33
<0.20
<0.20
N/A
N/A
0.0119
0.027
BC-20S
Wells Inside Waste Boundary
10/[30,31]/13
16.4
0.0278
N/A
15.00
21.1
21.1
N/A
45.8
N/A
142
435
0.75
0.78
N/A
N/A
<0.0100
<0.010
BC-20D
Wells Inside Waste Boundary
10/[30,31]/13
<5.0
<0.0200
N/A
16.40
<1.0
<1.0
N/A
65.8
N/A
138
375
<0.20
<0.20
N/A
N/A
<0.0100
<0.010
BC-30S
Wells Inside Waste Boundary
10/[30,31]/13
<5.0
<0.0200
N/A
8.09
<1.0
<1.0
N/A
25.8
N/A
115
440
<0.20
<0.20
N/A
N/A
<0.0100
<0.010
BC-30S DUP
Wells Inside Waste Boundary
10/[30,31]/13
<5.0
<0.0200
N/A
7.90
<1.0
<1.0
N/A
25.2
N/A
118
438
<0.20
<0.20
N/A
N/A
<0.0100
<0.010
BC-30D-2
Wells Inside Waste Boundary
10/[30,31]/13
<5.0
<0.0200
N/A
7.69
<1.0
<1.0
N/A
21.9
N/A
106
358
<0.20
<0.20
N/A
N/A
<0.0100
I <0.010
Tables - Page 32

Table 7 - Ash Basin Pore Water Analytical Results
Notes:
1. Analytical parameter abbreviations:
Temp. = Temperature
DO = Dissolved oxygen
Cond. = Specific conductance
ORP = Oxidation reduction potential
TDS = Total dissolved solids
TSS = Total suspended solids
TOC = Total organic carbon
2. Units:
3. °C = Degrees Celsius
SU = Standard Units
pS = microsiemens
NTU = Nephelometric Turbidity Unit
mg/L = milligrams per liter
ug/L = micrograms per liter
CaCO3 = calcium carbonate
N/A = Not applicable
4. NE = Not established
5. " Interim Maximum Allowable Concentration (IMAC) standards
6. Highlighted cells indicate concentrations that exceed the 15A NCAC 2L Standard
7. Analytical results with "<" preceding the result indicates that the parameter was not
detected at a concentration which attains or exceeds the laboratory reporting limit
Tables - Page 33

Table 8 - Seep Analytical Results
Analytical Parameter
pH
Temp.
Cond.
Flow
Aluminum
Antimony
Arsenic
Barium
Boron
Cadmium
Calcium
Chloride
Chromium
COD
Copper
Fluoride
Hardness
Units
SU
°C
pmhos/cm
MGD
mg/I
Ng/I
Ng/I
mg/I
mg/I
Ng/I
mg/I
mg/I
Ng/I
mg/I
Ng/I
mg/I
mg/I (CaCO3)
15A NCAC 02B .0200 Surface Water Quality Standard
6.0-9.0
NE
NE
NE
0.087
5.6
10
1.0
NE
2
NE
230
50
NE
7
1.8
100
Analytical Method
200.7
200.8
200.8
200.7
200.7
200.8
200.7
300.0
200.8
HACH 8000
200.8
300.0
200.7
Field Measurements
Seep ID
Location
Sample Collection Date
S-1
East of Cell 3
9/10/2014
6.65
20.6
202
0.0023
5.04
<1
1.08
0.218
0.214
<1
14.3
11.0
3.32
<20
6.52
0.12
73
S-2
East of Cell 3
9/10/2014
6.30
20.3
139
0.0016
4.26
<1
<1
0.062
<0.05
<1
13.0
5.3
4.48
<20
7.35
0.12
61.2
S-3
East of Cell 3
9/10/2014
6.57
19.6
153
0.0021
4.13
<1
<1
0.079
<0.05
<1
13.3
6.3
4.02
<20
6.81
0.12
61.6
S-4
Northeast of Cell 3
9/10/2014
6.89
16.7
181
0.0132
14.1
<1
<1
0.078
0.255
<1
15.0
14.0
9.00
<20
13.60
<0.1
64.2
S-5
North of Cell 2 & 3
9/10/2014
6.80
19.4
242
0.0029
0.339
<1
<1
0.042
0.729
<1
15.1
11.0
<1
<20
<1
0.11
82.4
S-6
North of Cell 2
9/10/2014
6.12
15.8
537
0.0225
0.288
<1
<1
0.051
<0.05
<1
67.6
5.8
1.32
<20
<1
<0.5
268
S-7
Northwest of Cell 1
9/10/2014
7.37
21.8
127
0.0002
2.55
<1
<1
0.042
<0.05
<1
13.9
4.9
2.06
20
4.84
0.16
58.6
S-8
Northwest of Cell 1
9/10/2014
6.86
24.4
328
0.021
0.232
<1
<1
0.039
0.474
<1
25.4
18.0
<1
<20
<1
0.12
115
S-9
West of Cell 1
9/10/2014
7.09
19.6
328
0.0016
1.77
<1
<1
0.052
0.815
<1
32.9
14.0
4.28
<20
5.62
0.21
145
S-10
West of Cell 1
9/10/2014
7.20
16.6
141
0.0049
0.18
<1
<1
0.035
<0.05
<1
13.0
4.1
<3.27
<20
<1
<0.1
60.1
Tables - Page 34

Table 8 - Seep Analytical Results
Analytical Parameter
Iron
Lead
Magnesium
Manganese
Mercury
Molybdenum
Nickel
Oil & Grease
Selenium
Sulfate
Thallium
TDS
TSS
Zinc
Units
mg/I
Ng/I
mg/I
mg/I
Ng/I
Ng/I
Ng/I
mg/I
Ng/I
mg/I
Ng/I
mg/I
mg/I
mg/I
15A NCAC 02B .0200 Surface Water Quality Standard
1.0
25
NE
0.200
0.012
160
25
see note 6
5
250
0.24
500
NE
0.05
Analytical Method
200.7
200.8
200.7
200.7
245.1
200.8
200.8
1664E
200.8
300.0
200.8
SM2540C
SM2540D
200.7
Seep ID Location Sample Collection Date
S-1
East of Cell 3
9/10/2014
11.9
4.17
9.04
4.6
<0.05
<1
2.35
<5
<1
15
<0.2
150
79
0.029
S-2
East of Cell 3
9/10/2014
8.7
3.21
6.96
0.206
<0.05
<1
3.87
<5
<1
2
<0.2
120
110
0.023
S-3
East of Cell 3
9/10/2014
8.71
3.44
6.91
0.322
<0.05
<1
2.83
<5
<1
4.7
<0.2
130
150
0.015
S-4
Northeast of Cell 3
9/10/2014
23.4
7.55
6.49
0.155
<0.05
<1
5.23
5
<1
26
<0.2
170
250
0.03
S-5
North of Cell 2 & 3
9/10/2014
0.727
<1
10.8
0.297
<0.05
<1
<1
5
<1
55
<0.2
170
12
<0.005
S-6
North of Cell 2
9/10/2014
0.479
<1
24.2
0.007
<0.05
<1
<1
<5
<1
220
<0.2
430
19
<0.005
S-7
Northwest of Cell 1
9/10/2014
4.88
3.22
5.8
0.265
<0.05
7.53
<1
<5
<1
5.6
<0.2
99
24
0.083
S-8
Northwest of Cell 1
9/10/2014
0.452
<1
12.5
1.270
<0.05
8.04
2.35
<5
<1
110
<0.2
230
5
0.021
S-9
West of Cell 1
9/10/2014
3.52
2.05
15.4
0.214
<0.05
6.61
9.53
<5
<1
52
<0.2
250
24
0.015
S-10
West of Cell 1
9/10/2014
0.337
<1
6.72
0.011
<0.05
<1
1.51
<5
<1
5.7
<0.2
120
40
<0.005
Tables - Page 35

Table 8 - Seep Analytical Results
Notes:
1. Analytical parameter abbreviations:
Temp. = Temperature
Cond. = Specific conductivity
COD = Chemical oxygen demand
TDS = Total dissolved solids
TSS = Total suspended solids
2. Units:
°C = Degrees Celsius
SU = Standard Units
pS/cm = microsiemens per centimeter/micromhos per centimeter
MGD = millions of gallons per day
mg/L = milligrams per liter
pg/I = micrograms per liter
CaCO3 = calcium carbonate
3. NE = Not established
4. Highlighted values indicate values that exceed the 15A NCAC 2B Standard
5. Analytical results with "<" preceding the result indicates that the parameter was not
detected at a concentration which attains or exceeds the laboratory reporting limit
6. Take the lowest LC50 available for the particular type of OG you have (or similar
OG) and multiply it by a safety factor of 0.01 to obtain the criteria
Tables - Page 36

TABLE 9 - ENVIRONMENTAL EXPLORATION AND SAMPLING PLAN
BUCK COMBINED CYCLE STATION
Exploration
Soil Borings
Shallow Monitoring Wells
Area
Estimated
Estimated
Screen
Boring IDs
Quantity Boring Depth
Well IDs
Quantity Well Depth
Length
Well IDs
(ft bgs)
(ft bgs)
(ft)
AB-2S/SL,
AB-3S/SL,
AB-1 D, AB-2D,
AB-1
AB-4S/SL,
3D, AB-4D, AB-5
Ash Basin
through
10 80-120
AB-5S/SL,
14 20-40
15
AB-6D, AB-7D,
AB-10
AB-7S/SL,
8D, AB-9D, an
AB-8S/SL,
AB-1 OD
AB-9S,
AB-1 OS
AS-1, AS-
AS-1S and
AS-1 D, AS-2D, a
Ash Storage
2, and
3 60-100
AS-3S
2 50-55
15
AS-3D
AS-3
GWA-1 S,
GWA-3S,
GWA-4S,
GWA-1 D, GWA-
Beyond
GWA-1
GWA-5S,
GWA-3D, GWA-
Waste
through
11 15-75
GWA-6S,
9 15-60
10-15
GWA-5D, GWA-
Boundary
GWA-11
GWA-7S,
GWA-7D, GWA-
GWA-9S,
GWA-9D, GW
GWA-10S,
10D, and GWA-1
and
GWA-11 S
BG-1, BG-
BG-1 S, BG-
BG-1 D, BG-2D,
Background
2, and BG-
3 30-100
2S, and BG-
3 15-30
10-15
BG-3D
3
3S
AB-
AB-
d
2D,
6D,
8D,
A-
and
Deep Monitoring Wells
Estimated
Estimated
Screen
Bedrock
Monitoring
Wells
Water Supply Wells
Surface
Water
Estimated
Estimated
Screen
Quantity
Casing
Well
Length
WeIIIDs
Quantity
Casing
Well
Length
WeIIIDs
Quantity
Quantity of
Quantity of
Depth
Depth
(ft)
Depth
Depth
(ft)
Locations
Samples
(ft bgs)
(ft bgs)
(ft bgs)
(ft bgs)
D,
10
50-100
65-115
5
AB-9BR
1
70-120
120-170
5
N/A
N/A
7
14
nd
3
65-85
80-100
5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
4D,
Existing
2 Stream
11
25-75
40-100
5
GWA-2BR,
2
45-105
95-155
5
Water
1
16 Seep
37
GWA-9BR
Supply
1 Off -site
Well
Pond
1D
3
40-80
60-100
5
BG-1 BR,
1
65-105
115-155
5
N/A
N/A
N/A
N/A
Notes:
1. Estimated boring and well depths based on data available at the time of work plan preparation and subject to change based on site -specific conditions in the field.
2. Laboratory analyses of soil, ash, groundwater, and surface water samples will be performed in accordance with the constituents and methods identified in Tables 10 and 11.
3. Additionally, soils will be tested in the laboratory to determine grain size (with hydrometer), specific gravity, and permeability.
4. During drilling operations, downhole testing will be conducted to determine in -situ soil properties such as horizontal and vertical hydraulic conductivity.
5. Actual number of field and laboratory tests will be determined in field by Field Engineer or Geologist in accordance with project specifications.
6. Surface water, stream, and seep sample locations include both water and sediment samples except for offsite pond which only includes water sample.
Tables - Page 37

TABLE 10 - SOIL AND ASH PARAMETERS AND CONSTITUENT ANALYTICAL
METHODS
INORGANIC COMPOUNDS
UNITS
METHOD
Antimony
mg/kg
EPA 6020A
Arsenic
mg/kg
EPA 6020A
Barium
mg/kg
EPA 6010C
Boron
mg/kg
EPA 6010C
Cadmium
mg/kg
EPA 6020A
Chloride
mg/kg
EPA 9056A
Chromium
mg/kg
EPA 6010C
Copper
mg/kg
EPA 6010C
Iron
mg/kg
EPA 6010C
Lead
mg/kg
EPA 6020A
Manganese
mg/kg
EPA 6010C
Mercury
mg/kg
EPA Method 7470A/7471 B
Nickel
mg/kg
EPA 6010C
pH
SU
EPA 9045D
Selenium
mg/kg
EPA 6020A
Thallium (low level) (SPLP Extract only)
mg/kg
EPA 6020A
Zinc
mg/kg
EPA 6010C
Notes:
1. Soil samples to be analyzed for Total Inorganics using USEPA Methods 6010/6020 and pH
using USEPA Method 9045, as noted above.
2. Ash samples to be analyzed for Total Inorganics using USEPA Methods 6010/6020 and pH
using USEPA Method 9045; select ash samples will also be analyzed for leaching potential
using SPLP Extraction Method 1312 in conjunction with USEPA Methods 6010/6020. SPLP
results to be reported in units of mg/L for comparison to 2L Standards.
Tables - Page 38

TABLE 11 - GROUNDWATER, SURFACE WATER, AND SEEP PARAMETERS AND
CONSTITUENT ANALYTICAL METHODS
PARAMETER RL UNITS METHOD
FIELD PARAMETERS
pH
NA SU
Field Water Quality Meter
Specific Conductance
NA mmho/cm
Field Water Quality Meter
Temperature
NA °C
Field Water Quality Meter
Dissolved Oxygen
NA mg/L
Field Water Quality Meter
Oxidation Reduction Potential
NA mV
Field Water Quality Meter
Turbidity
NA NTU
Field Water Quality Meter
Ferrous Iron
NA mg/L
Field Test Kit
INORGANICS
Aluminum
5 pg/L
EPA 200.7 or 6010C
Antimony
1 pg/L
EPA 200.8 or 6020A
Arsenic
1 pg/L
EPA 200.8 or 6020A
Barium
5 pg/L
EPA 200.7 or 6010C
Beryllium
1 pg/L
EPA 200.8 or 6020A
Boron
50 pg/L
EPA 200.7 or 6010C
Cadmium
1 lag/L
EPA 200.8 or 6020A
Chromium
1 pg/L
EPA 200.7 or 6010C
Cobalt
1 lag/L
EPA 200.8 or 6020A
Copper
0.005 mg/L
EPA 200.7 or 6010C
Iron
10 fag/L
EPA 200.7 or 6010C
Lead
1 pg/L
EPA 200.8 or 6020A
Manganese
5 lag/L
EPA 200.7 or 6010C
Mercury (low level)
0.012 lag/L
EPA 245.7 or 1631
Molybdenum
5 pg/L
EPA 200.7 or 6010C
Nickel
5 lag/L
EPA 200.7 or 6010C
Total Combined Radium (Ra-226 and
5 pCi/L
EPA 903.0
Ra-228)
Selenium
1 pg/L
EPA 200.8 or 6020A
Strontium
5 lag/L
EPA 200.7 or 6010C
Thallium (low level)
0.2 pg/L
EPA 200.8 or 6020A
Vanadium (low level)
0.3 mg/L
EPA 200.8 or 6020A
Zinc
5 pg/L
EPA 200.7 or 6010C
ANIONS/CATIONS
Alkalinity (as CaCO3)
20 mg/L
SM 2320B
Bicarbonate
20 mg/L
SM 2320
Calcium
0.01 mg/L
EPA 200.7
Carbonate
20 mg/L
SM 2320
Chloride
0.1 mg/L
EPA 300.0 or 9056A
Magnesium
0.005 mg/L
EPA 200.7
Nitrate as Nitrogen
0.023 mg-N/L
EPA 300.0 or 9056A
Potassium
0.1 mg/L
EPA 200.7
Sodium
0.05 mg/L
EPA 200.7
Sulfate
0.1 mg/L
EPA 300.0 or 9056A
Sulfides
0.05 mg/L
SM450OS-D
Total Dissolved Solids
25 mg/L
SM 2540C
Total Organic Carbon
0.1 mg/L
SM 5310
Total Suspended Solids
2 mg/L
SM 2450D
ADDITIONAL GROUNDWATER CONSTITUENTS
Iron (Fe(II), Fe(III) Speciation
Vendor Specific lag/L
IC-ICP-CRC-MS
Manganese Speciation (Mn(II), Mn(IV)
Vendor Specific pg/L
IC-ICP-CRC-MS
Notes:
1. Select constituents will be analyzed for total and dissolved concentrations.
2. RL is the laboratory analytical method reporting limit.
3. NA indicates not applicable.
4. Following wells to be sampled for Total Combined Radium (MW-3S/D, and BG-1 S/D) . DWR regional office will be consulted
to determine if additional wells are to be sampled.
5. Sulfide as 1-12S sampled in groundwater samples only.
6. All EPA methods and RLs are at or below respective 2L or 26 standards for constituents with standards.
Tables - Page 39

A:4i'A&A
NCDENR
North Carolina Department of Environment and Natural Resources
Pat McCrory John E. Skvarla, III
Governor Secretary
August 13, 2014
CERTIFIED MAIL 7004 2510 0000 3651 1168
RETURN RECEIPT REQUESTED
Paul Newton
Duke Energy
526 South Church Street
Charlotte, NC 28202
Subject: Notice of Regulatory Requirements
Title 15A North Carolina Administrative Code (NCAC) 02L .0106
14 Coal Ash Facilities in North Carolina
Dear Mr. Newton:
Chapter 143, North Carolina General Statutes, authorizes and directs the Environmental
Management Commission of the Department of Environment and Natural Resources to protect
and preserve the water and air resources of the State. The Division of Water Resources (DWR)
has the delegated authority to enforce adopted pollution control rules.
Rule 15A NCAC 02L .0103(d) states that no person shall conduct or cause to be conducted any
activity which causes the concentration of any substance to exceed that specified in 15A NCAC
02L .0202. As of the date of this letter, exceedances of the groundwater quality standards at 15A
NCAC 02L .0200 Classifications and Water Quality Standards Applicable to the Groundwaters
of North Carolina have been reported at each of the subject coal ash facilities owned and
operated by Duke Energy (herein referred to as Duke).
Groundwater Assessment Plans
No later than September, 26 2014 Duke Energy shall submit to the Division of Water Resources
plans establishing proposed site assessment activities and schedules for the implementation,
completion, and submission of a comprehensive site assessment (CSA) report for each of the
following facilities in accordance with 15A NCAC 02L .0106(g):
Asheville Steam Electric Generating Plant
Belews Creek Steam Station
Buck Steam Station
Cape Fear Steam Electric Generating Plant
Cliffside Steam Station
1636 Mail Service Center, Raleigh, North Carolina 27699-1636
Phone: [phone] Internet: www.ncdenr.gov
An Equal Opportunity 1 Affirmative Action Employer — Made in part by recycled paper
A-1

Mr. Paul Newton
August 12, 2014
Page 2 of 3
Dan River Combined Cycle Station
H.F. Lee Steam Electric Plant
Marshall Steam Station
Mayo Steam Electric Generating Plant
Plant Allen Steam Station
Riverbend Steam Station
Roxboro Steam Electric Generating Plant
L.V. Sutton Electric Plant
Weatherspoon Steam Electric Plant
The site assessment plans shall include a description of the activities proposed to be completed
by Duke that are necessary to meet the requirements of 15A NCAC 02L .0106(g) and to provide
information concerning the following:
(1) the source and cause of contamination;
(2) any imminent hazards to public health and safety and actions taken to mitigate
them in accordance to 15A NCAC 02L .0106(f);
(3) all receptors- and significant exposure pathways;
(4) the horizontal and vertical extent of soil and groundwater contamination and all
significant factors affecting contaminant transport; and
(5) geological and hydrogeological features influencing the movement, chemical, and
physical character of the contaminants.
For your convenience, we have attached guidelines detailing the information necessary for the
preparation of a CSA report. The DWR will review the plans and provide Duke with review
comments, either approving the plans or noting any deficiencies to be corrected, and a date by
which a corrected plan is to be submitted for further review and comment or approval. For those
facilities for which Duke has already submitted groundwater assessment plans, please update
your submittals to ensure they meet the requirements stated in this letter and referenced
attachments and submit them with the others.
Receptor Survey
No later than October 14'', 2104 as authorized pursuant to 15A NCAC 02L .0106(g), the DWR is
requesting that Duke perform a receptor survey at each of the subject facilities and submitted to
the DWR. The receptor survey is required by 15A NCAC 02L .0106(g) and shall include
identification of all receptors within a radius of 2,640 feet (one-half mile) from the established
compliance boundary identified in the respective National Pollutant Discharge Elimination
System (NPDES) permits. Receptors shall include, but shall not be limited to, public and private
water supply wells (including irrigation wells and unused or abandoned wells) and surface water
features within one-half mile of the facility compliance boundary. For those facilities for which
Duke has already submitted a receptor survey, please update your submittals to ensure they meet
the requirements stated in this letter and referenced attachments and submit them with the others.
If they do not meet these requirements, you must modify and resubmit the plans.
A-2

Mr. Paul Newton
August 12, 2014
Page 3 of 3
The results of the receptor survey shall be presented on a sufficiently scaled map. The map shall
show the coal ash facility location, the facility property boundary, the waste and compliance
boundaries, and all monitoring wells listed in the respective NPDES permits. Any identified
water supply wells shall be located on the map and shall have the well owner's name and
location address listed on a separate table that can be matched to its location on the map.
Failure to comply with the State's rules in the manner and time specified may result in the
assessment of civil penalties and/or the use of other enforcement mechanisms available to the
State.
We appreciate your attention and prompt response in this matter. If you have any questions,
please feel free to contact S. Jay Zimmerman, Water Quality Regional Operations Section Chief,
at [phone].
Sincerely,
hn E. Skvarla, III
Attachment enclosed
cc: Thomas A. Reeder, Director, Division of Water Resources
Regional Offices — WQROS
File Copy
A-3

August 12, 2014
GUIDELINES FOR COMPREHENSIVE SITE ASSESSMENT
This document provides guidelines for those involved in the investigation of
contaminated soil and/or groundwater, where the source of contamination is from:
■ Incidents caused by activities subject to permitting under G.S. 143-215.1
■ Incidents caused by activities subject to permitting under G.S. 87-88
■ Incidents arising from agricultural operations, including application of
agricultural chemicals, but not including unlawful discharges, spills or
disposal of such chemicals
Comprehensive Site Assessment (CSA)
NOTE: Regional Offices may request additional information in support of the CSA to aid
in their review and will not approve the CSA if any of the elements specified below have
not been included or have not been sufficiently addressed
Minimum Elements of the Comprehensive Site Assessment Report:
A. Title Page
• Site name, location and Groundwater Incident number (if
assigned) and Permit Number;
• Date of report;
• Responsible Party and/or permittee, including address and
phone number;
• Current property owner including address and phone
number;
• Consultanticontractor information including address and
phone number;
• Latitude and longitude of the facility; and
• Seal and signature of certifying P.E. or P.G., as appropriate.
B. Executive Summary
The Executive Summary should provide a brief overview of the pertinent
site information (i.e., provide sufficient information to acquaint the reader
with the who, what, when, where, why and how for site activities to date).
1. Source information:
Type of contaminants
2. Initial abatement/emergency response information.
1
A-4

August 12, 2014
3. Receptor information:
• Water supply wells;
• Public water supplies (wells, surface water intakes);
• Surface water bodies;
• Wellhead protection areas;
• Deep aquifers in the Coastal Plain physiographic region;
• Subsurface structures; and
• Land use.
4. Sampling/investigation results:
• Nature and extent of contamination;
• Maximum contaminant concentrations;
• Site hydrogeology.
5. Conclusions and recommendations.
C. Table of Contents
• First page number for each section listed.
• List of figures (all referenced by number and placed in a
single section following contents text).
• List of tables (all referenced by number and placed in a single
section following contents text).
• List of appendices.
D. Site History and Source Characterization
• Provide a history of property ownership and use. Indicate
dates of ownership, uses of the site, and potential sources of
contaminants.
• Discuss the source(s) of contamination, including primary
and secondary sources.
• For permitted activities, describe nature of activity, permitted
waste, application of all instances of
over-application/irrigation of wastes or water
• Summarize assessment activities and corrective actions
performed to date including emergency response, initial
abatement, primary and secondary source removal.
• Discuss geographical setting and present/future surrounding
land uses.
E. Receptor Information
Provide a site map showing labeled well locations within a
2
A-5

August 12, 2014
minimum of 1500 feet of the known extent of contamination.
Key to the table and maps described.
NOTE: As the known extent of contamination changes, the
receptor survey must be updated to reflect the change. This
applies throughout the Receptor Information section.
• In table format, list all water supply wells, public or private,
including irrigation wells and unused wells, (omit those that
have been properly abandoned in accordance with 15A
NCAC 2C .0100) within a minimum of 1500 feet of the known
extent of contamination. Note whether well users are also
served by a municipal water supply.
• For each well, include well number, well owner and user
names, addresses and telephone numbers, use of the well,
well depth, well casing depth, well screen interval, and
distance from source of contamination;
NOTE: It will often be necessary to conduct any or all of the
following in order to ensure reliability in a water supply well
survey.
o Call the city/county water department to inquire about
city water connections;
o Visit door-to-door (make sure that you introduce
yourself and state your purpose to residents prior to
examining their property) to obtain accurate
description of water usage, and if some residents are
not at home, ask surrounding neighbors who are
home about the water usage at those residences.
Even if a public water line is available, some
residents still use their well water and are not
connected to the public water system; and
o Search for water meters and well houses.
• Site map showing location of subsurface structures (e.g.,
sewers, utility lines, conduits, basements, septic tanks,
drain fields, etc.) within a minimum of 1,500 feet of the known
extent of contamination;
• Table of surrounding property owner addresses;
• Discuss the availability of public water supplies within a
minimum of 1,500 feet of the source area, including the
distance and location to the nearest public water lines and
the source(s) of the public water supply;
3
A-6

August 12, 2014
• Identify all surface water bodies (e.g., ditch, pond, stream,
lake, river) within a minimum of 1,500 feet of the source of
contamination;
Determine the location of any designated wellhead protection
areas as defined in 42 USC 300h-7(e) within a minimum of
1,500 feet of the source of contamination. Identify and
discuss the location of the water supply well(s) for which the
area was designated a wellhead protection area, and the
extent of the protected area. Include information about the
well owner, well -construction specifications (especially at
screened intervals), pumping rate and pumping schedule.
Information regarding designated wellhead protection areas
may be obtained by contacting the Public Water Supply
Section at [phone];
• Discuss the uses and activities (involving possible human
exposure to contamination) that could occur at the site and
adjacent properties. Examples of such activities and uses
include but are not limited to use of a property for an office,
manufacturing operation, residence, store, school, gardening
or farming activities, recreational activities, or undeveloped
land;
• Determine whether the contaminated area is located in an
area where there is recharge to an unconfined or
semi -confined deeper aquifer that is being used or may be
used as a source of drinking water. Based on a review of
scientific literature on the regional hydrogeology and well
construction records and lithological logs for deeper wells in
the area, identify and describe the deep aquifers underlying
the source of contamination. Include information on the depth
of the deep aquifer in relation to the surficial saturated zone,
the lithology and hydraulic conductivity of the strata between
the surficial aquifer and the deeper aquifer, and the
difference in groundwater head between the surficial aquifer
and the deeper aquifer. Discuss the local and regional usage
of the deep aquifer and the draw down from major pumping
influences. Also, specify the distance from the source of
contamination to major discharge areas such as streams and
rivers. Cite all sources and references used for this
discussion.
NOTE: This requirement (last bullet) only pertains to
A-7

August 12, 2014
contamination sources in the Coastal Plain physiographic region
as designated on a map entitled "Geology of North Carolina"
published by the Department in 1985. However,
recharge/discharge, hydraulic conductivity, lithology, head
difference, etc. is also important information at mountains
and piedmont sites.
F. Regional Geology and Hydrogeology
Provide a brief description of the regional geology and hydrogeology. Cite
all references.
G. Site Geology and Hydrogeology
• Describe the soil and geology encountered at the site. Use
the information obtained during assessment activities (e.g.,
lithological descriptions made during drilling, probe surveys,
etc.). This information should correspond to the geologic
cross sections required in N. below; and
• Based on the results of the groundwater investigation,
describe the site hydrogeology, including a discussion of
groundwater flow direction, hydraulic gradient, hydraulic
conductivity and groundwater velocity. Discuss the effects of
the geologic and hydrogeological characteristics on the
migration, retardation, and attenuation of contaminants.
H. Soil Sampling Results
Using figures and tables to the extent possible, describe all soil sampling
performed to date and provide the rationale for sample locations, number
of samples collected, etc. Include the following information:
• Location of soil samples;
• Date of sampling;
• Type of soil samples (from excavation, borehole, Geoprobe,
etc.);
• Soil sample collection procedures (split spoon, grab, hand
auger, etc.)
• Depth of soil samples below land surface;
• Soil sample identification
• Soil sample analyses;
• Soil sample analytical results (list any contaminant detected
above the method detection limit); and
5
A-8

August 12, 2014
• Identify any sample analytical results that exceed the
applicable cleanup levels.
NOTE: Information related to H. above should correspond to the
sampling location and sampling results maps required in N. below.
I . Groundwater Sampling Results
Using figures and tables to the extent possible describe the groundwater
sampling performed to date and provide the rationale for sample locations
(based on source and contaminant type), number of samples collected,
etc. Include the following information:
• Location of groundwater samples and monitoring wells;
• Date of sampling;
• Groundwater sample collection procedures (bailer, pump,
etc.);
• Groundwater sample identification and whether samples
were collected during initial abatement, CSA, etc.;
• Groundwater sample analyses;
• Groundwater sample analytical results (list any contaminant
detected above the method detection limit; and
• Identify all sample analytical results that exceed 15A NCAC
2L or interim standards.
NOTE: Information related to I. above should correspond to the
sampling location and sampling results maps required in N. below.
J. Hydrogeological Investigation
Describe the hydrogeological investigation performed including all
methods, procedures and calculations used to characterize site
hydrogeological conditions. The following information should be discussed
and should correspond to the maps and figures required below:
• Groundwater flow direction;
• Hydraulic gradient (horizontal and vertical);
• Hydraulic conductivity;
• Groundwater velocity;
Contaminant velocity;
• Slug test results; *
• Aquifer test results;
• Plume's physical and chemical characterization; and
• Fracture trace study if groundwater in bedrock is impacted.
6
A-9

August 12, 2014
* Check with the Regional Office prior to performing these tests
and study to see if necessary for the site.
K. Groundwater Modeling Results
Groundwater modeling or predictive calculations may be necessary at
some sites (source area proximate to surface water, source area located
within wellhead protection area or source area overlying semi -confined or
unconfined deeper Coastal Plain aquifer) to verify, based on site specific
hydrogeological conditions, whether groundwater contamination poses a
risk to receptors. For contamination shown to pose a risk to receptors,
groundwater modeling may be necessary to determine an appropriate
cleanup level for contaminated groundwater. Modeling should illustrate the
input data used to complete the model and will generally be required for
natural attenuation proposals (see Groundwater Modeling Policy at
hftr)://Portal.ncdenr.org/web/wci/aps/���-qwpro/Soricy).
NOTE: Input data for models should be derived from site specific
information with limited assumptions or estimates. All assumptions and
estimated values including biodegradation rates must be conservative
(predict reasonable worst -case scenarios) and must be well documented.
L. Discussion
Nature and extent of contamination, including primary and
secondary source areas, and impacted groundwater and
surface water resources;
• Maximum contaminant concentrations;
• Contaminant migration and potentially affected receptors
M. Conclusions and Recommendations
If corrective action will be necessary, provide a preliminary evaluation of
remediation alternatives appropriate for the site. Discuss the remediation
alternatives likely to be selected. Note that for impacts to groundwater
associated with permitted activities, corrective action pursuant to 15A
NCAC 2L .0106(k), (1) and (m) is not applicable, unless provided for
pursuant to 15A NCAC 2L .0106(c) and (e) or through a variance from the
Environmental Management Commission (EMC).
N. Figures
■ 71/2 minute USGS topographic quadrangle map showing an area
A-10

August 12, 2014
within a minimum of a 1,500-foot radius of the source of
contamination and depicting the site location, all water supply wells,
public water supplies, surface water intakes, surface water bodies,
designated well head protection areas, and areas of recharge to
deeper aquifers in the Coastal Plain that are or may be used as a
source for drinking water;
Site map locating source areas, site boundaries, buildings, all water
supply wells within a minimum of 1,500 feet, named
roads/easements/right-of-ways, subsurface utilities, product or
chemical storage areas, basements and adjacent properties, scale
and north arrow;
At least two geologic cross sections through the saturated and
unsaturated zones intersecting at or near right angles through the
contaminated area using a reasonable vertical exaggeration.
Indicate monitoring well/sample boring/sample locations and
analytical results for soil samples. Identify the depth to the water
table. Provide a site plan showing the locations of the cross
sections;
Site map(s) showing the results of all soil sampling conducted.
Indicate sampling identifications, sampling depths, locations and
analytical results;
■ Site map(s) showing the results of all groundwater sampling
conducted. Indicate sampling locations, monitoring well
identifications, sample identifications, and analytical results;
Separate groundwater contaminant iso-concentration contour maps
showing total volatile organic compound concentrations, total
semi -volatile organic compound concentrations and concentrations
for the most extensive contaminant. Maps should depict the
horizontal and vertical extent. Contour line for applicable 2L
standard should be shown in bold;
Site map(s) showing the elevation of groundwater in the monitoring
wells and the direction of groundwater flow. Contour the
groundwater elevations. Identify and locate the datum (arbitrary
A-11

August 12, 2014
100', USGS, NGVD) or benchmark. Indicate the dates that water
level measurements were made. There should be one map for each
series of water level measurements obtained;
■ Groundwater contaminant iso-concentration contour cross-section;
and
■ Site map(s) showing the monitoring wells.
NOTE: If possible, use a single base map to prepare site maps using a
map scale of 1 inch = 40 feet (or a smaller scale for large sites, if
necessary). Maps and figures should include conventional symbols,
notations, labeling, legends, scales, and north arrows and should
conform to generally accepted practices of map presentation such as
those enumerated in the US Geological Survey pamphlet, "Topographic
Maps".
O. Tables
List all water supply wells, public or private, including irrigation wells
and unused wells, (omit those that have been properly abandoned
in accordance with 15A NCAC 2C .0100) within a minimum of 1500
feet of the known extent of contamination For each well, include the
well number (may use the tax map number), well owner and user
names, addresses and telephone numbers, use of the well, well
depth, well casing depth, well screen interval and distance from the
source of contamination;
List the names and addresses of property owners and occupants
within or contiguous to the area containing contamination and all
property owners and occupants within or contiguous to the area
where the contamination is expected to migrate;
List the results for groundwater samples collected including sample
location; date of sampling; sample collection procedures (bailer,
pump, etc.); sample identifications; sample analyses; and sample
analytical results (list any contaminant detected above the method
detection limit in bold); and
■ List for each monitoring well, the monitoring well identification
r_10M

August 12, 2014
numbers, date water levels were obtained, elevations of the water
levels, the land surface, top of the well casing, screened interval
and bottom of the well.
P Appendices
• Boring logs and lithological descriptions;
• Well construction records;
• Standard procedures used at site for sampling, field equipment
decontamination, field screening, etc.;
• Laboratory reports and chain -of -custody documents;
• Copies of any permits or certificates obtained, permit number,
permitting agency, and
• Modeling data and results;
• Slug/pumping test data; and
• Certification form for CSA
10
A-13

August 12, 2014
DIVISION OF WATER RESOURCES
Certification for the Submittal of a Comprehensive Site Assessment
Responsible Party and/or Permittee:
Contact Person:
Address:
City: State: Zip Code:
Site Name:
Address:
City: State: Zip Code:
Groundwater Incident Number (applicable):
I, , a Professional Engineer/Professional Geologist
(circle one) for (firm or
company of employment) do hereby certify that the information indicated below is
enclosed as part of the required Comprehensive Site Assessment (CSA) and that
to the best of my knowledge the data, assessments, conclusions,
recommendations and other associated materials are correct, complete and
accurate.
(Each item must be initialed by the certifying licensed professional)
1. The source of the contamination has been identified. A list of all
potential
sources of the contamination are attached.
2. Imminent hazards to public health and safety have been identified.
3. Potential receptors and significant exposure pathways have been
identified.
4. Geological and hydrogeological features influencing the movement
of groundwater have been identified. The chemical and physical character of the
contaminants have been identified.
5. The CSA sufficiently characterizes the cause, significance and
extent of groundwater and soil contamination such that a Corrective Action Plan
can be developed. If any of the above statements have been altered or items not
initialed, provide a detailed explanation. Failure to initial any item or to provide
written justification for the lack thereof will result in immediate return of the CSA to
the responsible party.
(Please Affix Seal and Signature)
11
A-14

1
2
3
4
5
L%_
7
2
G
I
C
C
7
A
BUCK STEAM STATION
rnA1 [IDEA 1IIUITC 9_G
YADKIN RIVER
W.E. 621.1
W.E.=633.9zfl/l
\ W.E. = 632.9 ®�
.X\\
J� \\ W.E.=632.7 �.
Nv
—�� 7 S
1 � h
\\ )\D
YADKIN RIVER
W.E. = 621.1'
NOTES:
1. PARCEL DATA FOR THE SITE WAS OBTAINED FROM WSP AND ROWAN COUNTY AND IS APPROXIMATE.
2. WASTE BOUNDARY AND ASH STORAGE BOUNDARY ARE APPROXIMATE.
3. EXISTING COMPLIANCE AND VOLUNTARY MONITORING WELL LOCATIONS PROVIDED BY DUKE ENERGY PER AS -BUILT SURVEY PROJECT NUMBER 002088-378799.
4. SHALLOW MONITORING WELLS (S) - WELL SCREEN INSTALLED ACROSS THE SURFICIAL WATER TABLE.
5. DEEP MONITORING WELLS (D) - WELL SCREEN INSTALLED IN THE TRANSITION ZONE BETWEEN COMPETENT BEDROCK AND THE REGOLITH.
6. TOPOGRAPHY DATA FOR THE SITE PROVIDED BY WSP (DATED DECEMBER 2013).
7. LOCATION OF ASH BASIN CLOSURE MONITORING WELLS, OBSERVATION WELLS, BORINGS, SURFACE WATER SAMPLES, AND PIEZOMETERS PROVIDED BY WSP (DATED NOVEMBER 2013).
8. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L .0107 (a).
9. MONITORING WELLS MW-2S AND MW-2D WERE DESTROYED DURING CONSTRUCTION OF THE BUCK COMBINED CYCLE PLANT.
OW-3
.,►����
B-1' �r
YADKIN RIVER
W.E. = 621.1'
S
jC") SW-11D
(I A6 - \,
3rl
8 CELL 3
SECONDARY PON
ELEVATION 673.3' I III \��l
PPROXIMATE) IJI(, o (I(Irlll
�\ II L
M W
MW_
W.E. = 673.4
l-1 V
'I W.E. _ 11 W.E. = 663.6'
672.8'
\� M\WJI'4/I
CELL 2
\ (� DISCH�114E TdV`1�.L?.}
I
) I
_ D I I I I
—_j \ I I 1 I
� 1
200' 0 200' 400'
SCALE
1 inch = 400 Feet
\ 1 1 I
1 I 1 I
\ 1 f I
\\ 1
\ 1
\ I I
I I
i
/ \ I
\ 1
\\ 1! I
HDR Engineering, Inc
of the Carolinas
NC Engineering Firm License Number:
F-0116
440 S Church Street, Suite 1000
Charlotte, NC 28202-2075
LEGEND:
PROPERTY BOUNDARY
COMPLIANCE BOUNDARY
COMPLIANCE BOUNDARY COINCIDENT
WITH DUKE ENERGY PROPERTY BOUNDARY
WASTE BOUNDARY
STREAM
OFFSITE PARCEL LINE
SURFACE WATER BODY (FROM WSP SURVEY)
EXISTING COMPLIANCE GROUNDWATER
MONITORING WELL
EXISTING VOLUNTARY GROUNDWATER
MONITORING WELL
ASH BASIN CLOSURE GROUNDWATER
MONITORING WELL
®
ENVIRONMENTAL BORING AND OBSERVATION WELL
®
DUKE ENERGY OBSERVATION WELL
ASH BASIN CLOSURE BORING LOCATION
S&ME BORING (2009)
CROSS SECTION LOCATION
SITE PLAN FOR MODELING CROSS SECTIONS
BUCK STEAM STATION ASH BASIN
DUKE ENERGY CAROLINAS, LLC
ROWAN COUNTY, NC
l
167
F
E
I
C
.,
DATE
MARCH 10, 2014
A
FIGURE
1 1 2 1 3 1 4
5
7

CROSS SECTION A -A'
761
741
721
+> 701
681
° 661
641
w 621
601
581
561
801
78,
76,
741
72,
701
O
C5 d 68,
v W 661
641
62,
60,
58,
SW
EAST
WEST
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U+UU
1+UU L'+UU :3+UU 4+UU
S+UU
6+UU
/+UU
8
uu y+UU
lU+UU
11+UU
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1a+UU
14+UU
15+UU
1b+UU
1 /+UU
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ASH STORAGE AREA
Q
z
7
BC-18
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ADDITIONAL a I
PRIMARY DIKE 0
z
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CELL 1
(SLUICED ASH)
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BC-22 TOE DRAIN AND D1
w
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Z
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— — — —
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BC-23
BC•20S
BC-20D _
— — — —
— — —
— — —
— — — —
— — — —
— — —
BLANKET DRAIN y
Q
—
7
-
Ow-10 Bc 32
DUKEVILLE RD
OU
M W-1 S-M WA D
STREAM
—
AL
MW-9S MW-9D
5
n+nn
i+nn P+nn R+nn 4+nn 5+nn rl+nn 7+nn
R+nn 9+nn
in+nn
ii+nn
iP+nn
1'3+nn
14+nn
1.5+nn
irl+nn 17+nn iR+nn
19+nn
Pn+nn Pi+nn
Pp+nn Rs+nn
ASH STORAGE AREA
/ (ASH FILL)
Station
40' 0 40' 80'
SCALE
1 inch = 80 Feet
CROSS SECTION B-B'
00
80
60
40
20
00
O
80 a
60 w
40
20
00
80
NE
-U+SU
U+UU
1+UU
2+UU J+UU 4+UU S+UU b+UU /+UU 8+UU
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lU+UU
11+UU
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14+UU
15+UU
16+UU
1 /+UU
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L'.:3+UU
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¢ K K
=
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—_
CELL 2
(SLUICED ASH)
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7
— _
MAIN DIKE
BC-30S'BC-30D-2
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m w t p w m w
7
B _ 3
BC-15
___
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B-7
B
6 — — — —
— — — —
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B-10 BC-30
— —
— — — —
-4
— — — — —
----
— — — —
OW-1
L z V Y� N
y ¢ zDw¢
—
— — — — —
— —
— —
— —
— — — — —
— — — —
— — — —
— — — — —
—
OW-2 B-2
a 7 o o a <
a U O
O a ¢
- OW-3' �MW-11 MW-11
—
—
YADKIN RIVER
n+nn i+nn R+nn R+nn a+nn+nn+nn+nn R+nn
9+nn
1n+n
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Station
50' 0 50' 100'
SCALE
1 inch = 100 Feet
-0 50
SE
0+00
1+00 2+00
3+00 4+00
5+00 6+00 7+00 8+00 9+00 10+00
CROSS
11+00 12+00 13+00
SECTION C-C'
14+00 15+00
16+00 17+00
72
DIVIDER DIKE
CELL3
70
MW-SD
o
CELL 3
B-9
B.10 (SLUICED ASH)
B.11 BC-30D-2 BC-30
68
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cz a o
(SLUICED ASH)
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— —
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00 _—_
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a
58
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56
0+00
1+00 2+00
3+00 4+00
5+00 6+00 7+00 8+00 9+00 10+00
11+00 12+00 13+00
14+00 15+00
16+00 17+00
Station
50'
0 50' 100'
SCALE
1 inch = 100 Feet
NOTES:
1. SEE FIGURE 4 (SITE MAP FOR MODELING CROSS SECTIONS) FOR LOCATION OF CROSS SECTIONS.
2. SURFACE TOPOGRAPHY DATA FOR THE SITE PROVIDED BY WSP (DATED DECEMBER 2013).
3. HYDROSTRATIGRAPHIC LAYERS BASED ON ASH BASIN CLOSURE EXPLORATION BORING DATA, COMPLIANCE AND VOLUNTARY
GROUNDWATER MONITORING WELL BORING DATA, PRE -BASIN CONSTRUCTION BORING DATA, AND PRELIMINARY ENGINEERING
STUDY BORING DATA (S&ME, DATED JANUARY 23, 2009).
4. MAIN DIKE AND ADDITIONAL PRIMARY DIKE DETAILS BASED ON PRE -CONSTRUCTION DESIGN DRAWINGS PROVIDED BY DUKE
ENERGY (MAIN DIKE: DWG NO. B-3039-D REV 24, ADDITIONAL PRIMARY DIKE: DWG NO. B-3039-D2 REV 3).
5. LOCATION OF THE TOE DRAIN AND BLANKET DRAIN SHOWN ON CROSS SECTION A -A' (AT TOE OF ADDITIONAL PRIMARY DIKE) IS
BASED ON DESIGN DRAWING NO. B-3039-D2 REV 3.
6. LOCATION OF THE BLANKET TOE DRAIN SHOWN ON CROSS-SECTION B-B' (AT TOE OF MAIN DIKE) IS BASED ON DESIGN DRAWING
NO. B-3039-D REV 24.
7. HYDROSTRATIGRAPHIC DESIGNATION DESCRIPTION PARAMETERS:
SPT = STANDARD PENETRATION TEST
%REC = PERCENT RECOVERY
RQD = ROCK QUALITY DESIGNATION
8. WATER LEVELS FOR OBSERVATION AND MONITORING WELLS WERE GAUGED BY HDR ON JANUARY 13, 2014.
9. BORINGS AND/OR WELLS SHOWN WITH A "BC" DESIGNATION WERE A PART OF THE ASH BASIN CLOSURE ASSESSMENT ACTIVITIES.
10. BORINGS SHOWN WITH A "B" DESIGNATION WERE A PART OF A PRELIMINARY ENGINEERING STUDY PERFORMED BY S&ME FOR
THE CONSTRUCTION OF AN INDUSTRIAL LANDFILL (DATED JANUARY 23, 2009).
11. WELLS WITH A "MW" DESIGNATION ARE A PART OF THE SITE'S GROUNDWATER MONITORING PROGRAM.
12. WELLS WITH A "OW" DESIGNATION ARE A PART OF THE SITE'S DAM SAFETY OBSERVATION WELL PROGRAM.
18+00 19t00
184-00 19+00
21t00 22t00 23t00 24t00
0
0
w
3
22+00 23+00 P_on-
21+004+00
BLANKET TOE DRAIN
(SEE NOTE 5)
NW
25+00 26+00 27+00 28+00 29+00
7
MW-10D 7
o�
_ z- -
- — o
J
a
0
5
5
25+00 26+00 27+00 28+00 29+00
LEGEND:
— — — — — WATER TABLE SURFACE (ESTIMATED)
ASH
F =FILL
ALLUVIUM
M1 = SOIL/SAPROLITE (SPT N<100)
( M2 = SAPROLITE/WEATHERED ROCK (SPT N>100 or REC<50%)
WF = PARTIALLY WEATHERED/FRACTURED ROCK (REC>50% and RQD<50%)
D = SOUND ROCK (REC>85% and RQD>50%)
DRAFT
C
0
d
W
60
40
20
00 4-
80
60 °
40 a
20 w
00
80
60
MARCH 10, 2014

Appendix C
Review of Groundwater Assessment Work
Plan Letter from S. Jay Zimmerman, Chief,
Water Quality Regional Operations Section,
NCDENR, To Harry Sideris, Duke Energy,
dated November 4, 2014.

WrYWA
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Resources
Pat McCrory
Governor
November 4, 2014
Mr. Harry Sideris
Senior Vice -President
Environment, Health, and Safety
Duke Energy
526 South Church Street
Mail Code EC3XP
Charlotte, NC 28202
RE: Duke Energy Carolinas, LLC
Buck Combined Cycle Station
NPDES Permit No. NCO004774 --- Rowan County
Review of Groundwater Assessment Work Plan
Dear Mr. Sideris:
John E. Skvarla, III
Secretary
On September 26, 2014, the Division of Water Resources (Division) received the Groundwater
Assessment Work Plan (GAP) for the subject facility. The GAP was submitted in accordance
with the August 13, 2014, Notice of Regulatory Requirements (NORR) and G.S. 130A-
309.209(a)(1). After careful review, the Division has determined that the GAP is deficient in
detailing a strategy to achieve compliance with NCAC 15A 2L .0106(g), the NORR issued to
Duke, and (or) applicable general statutes. The plan as submitted fails to provide an adequate
level of detail regarding the planned assessment activities, which if left unchanged may lead to
an inadequate assessment of environmental conditions at the site. To assist you in drafting a
complete GAP, the Division offers you the following review comments which must be addressed
and incorporated into a revised groundwater assessment work plan. This review document is
separated into comments applicable to all previously submitted plans followed by comments
applicable to the referenced facility
General Comments Applicable to All Facilities
1. The Site Conceptual Model (SCM) section of the work plans does not provide sufficient
detail needed for the Division to adequately review the proposed data collection efforts.
The SCM section should include an "initial conceptual model" as described in
Groundwater Modeling Policy, May 31, 2007, page 6, paragraph 2, which states, "An
initial conceptual model should be developed from available regional and local studies
and information [existing site data], and initial site visits before significant site -specific
1636 Mail Service Center, Raleigh, North Carolina 27699-1636
Phone: [phone] Internet: www.ncdenr.gov
An Equal Opportunity 1 Afiirmative Action Employer — Made in part by recycled paper
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November 4, 2014
Page 2 of 11
data collection efforts are undertaken. This step is necessary to assure that adequate
types and quantities of data are collected..." The initial conceptual model will be refined
or modified later in the process as a result of data collection. The refined or modified
model, the SCM, will then be used as the foundation upon which any numerical models
are developed for the site. Importantly, the initial conceptual model should identify data
gaps and provide the context and rationale for the types and- amounts of data collection
proposed in the work plans.
Refer to the Modeling policy, the Hydrogeologic Investigation and Reporting Policy
(May 31, 2007), and other pertinent references such as ASTM E1689-95, for the elements
expected in the initial conceptual model. Ensure also that the nature, sources,and sinks
of site contaminants of concern, along with their mobility, retention, and transport
characteristics are addressed.
2. The numerical modeling description presented in the GAP is inadequate. The draft GAP
states that fate and transport modeling will be conducted using MODFLOW and MT3D
or RT31), with very little supporting rationale or information identified to justify the use
of the chosen model or approach. Explaining the rationale for the chosen model type and
design (including the inputs that will be needed for the model) will help make site
assessment data collection more efficient and may highlight deficiencies in the initial
conceptual model.
To provide context and rationale for the chosen model(s) and proposed data collection
efforts, provide in the GAP, at a minimum, the following information:
a) the purpose of any proposed numerical modeling,
b) the question(s) the model will help answer,
c) basic information about the model (type, boundaries, layers, whether/how
site heterogeneities will be modeled, etc.),
d) a description of the partition coefficient (Kd), how, where, and at what
depths it will be derived, and how/whether it will adequately account for
the dominant mechanisms of contaminant retention,
e) whether stream flow measurements are needed for the model and, if so,
when, where, and how those would be measured,
f) model limitations, and
g) specific data gaps (types, general locations and depths, etc) that must be
filled in order to develop the model(s).
Refer to Groundwater Modeling Policy, May 31, 2007 for the elements expected in any
numerical model developed for the site.
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November 4, 2014
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3. The proposed borings, core, and well installation work are inadequate to understand,
characterize, and (or) model subsurface conditions at the sites. For piedmont and
mountain sites, the GAP shall propose field work necessary to evaluate and document the
following:
a) ' presence/absence,
b) areal extent and depth/thickness,
c) flow and transport properties, and
d) heterogeneity of the following groundwater flow zones: alluvial/fluvial,
fill/residuum/saprolite, weathered rock (transition zone), and fresh,
competent fractured bedrock. Specifically, continuous core shall be
collected from land surface to a depth of at least 50 feet into fresh,
competent bedrock at a sufficient number of locations inside and outside
of ash basins to understand the flow system in areas proposed for
modeling and (or) areas of contaminant concern. All cores shall be
described/logged, photographed, and retained.
Data previously obtained from existing voluntary and compliance well borings and wells
shall also be used to understand and characterize the multipart flow system. Data
collection should also be sufficient for the development of any proposed numerical
models.
Note: Drilling and coring methods shall be used to prevent potential cross
contamination of flow zones, as stipulated in 15,4 NCAC 02C, and, where
applicable, to maintain structural integrity of dam.
4. Rather than abandoning the cored locations, consideration should be given to converting
borings to either a well nest/cluster or a piezometer nest/cluster. bested/clustered wells
shall be open to each of the dominant flow zones through the use of appropriately sized
screens and discreet screened intervals and shall be installed to measure groundwater
quality and properties that may affect contaminant mobility and transport. If the boring is
not of sufficient diameter to install all of the necessary nested wells/piezometers, the
remaining wells/piezometers should be installed in the immediate vicinity.
In addition to the logging described in comment 3 above, each core location shall include
the collection of a solid phase sample at the following intervals:
a) immediately above the water table,
b) immediately below the water table,
c) within the saturated upper transition zone material (if not already included
in a) or b) above), and
d) from a primary, open, stained fracture within fresh bedrock, if these zones
exist.
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Duke Energy Carolinas, LLC - Buck
November 4, 2014
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The sample(s) shall be analyzed, at a minimum, for the following:
type of material, formation from which it came, minerals present, chemical
composition as oxides, hydrous Fe, Mn, and Al oxides content, organic carbon
content, organic carbonate content, cation exchange capacity, anion exchange
capacity, surface area, moisture content, particle size analysis, Atterberg limits,
specific gravity, porosity, permeability, and any other physical properties or
analyses that may be required to estimate a batch partition coefficient Kd or
otherwise serve as input to a chosen model.
In addition, total analytes (see comment #12), SPLP analytes (see comment #12), and
speciation of selected inorganics shall be conducted for selected sample locations in
sufficient quantity and distribution to characterize the solid and aqueous chemistry and
geochemistry in locations and depths of contaminant concern, and this work shall be
clearly defined in the GAP. Inorganic speciation typically will include Fe and Mn, along
with others that may shed light on contaminant toxicity, mobility, and (or) prevailing
geochemical conditions. Sulfide and methane shall also be collected at selected locations
to evaluate geochemical conditions. Water and bed sediment samples from seeps and
streams shall be treated and analyzed in a manner consistent with the description above.
If a given analysis is believed to be unnecessary at a given location or depth based on site
conditions or assessment objectives, provide a detailed rationale for its omission for the
Division's consideration. In general, the collection strategy for ash samples from cores
inside of ash basins as described in the GAP appear to be adequate, along with the
proposed total and SPLP analyses. The need for additional core locations, where
applicable, is provided in the site -specific comment section below. Note that the chosen
numerical model(s), extent of contamination, and size of site shall drive the number,
distribution, and type of solid phase sample collection and analyses needed to understand
the retention and mobility of constituents of concern.
5. Duke shall describe the batch partition coefficient Kd, the individual inorganics that will
be tested, and whether multi -metals will be co -tested. Duke shall identify the
approximate number, distribution, and depths/flow zones of solid phase samples used to
derive the Kd(s) across the site.
6. The term "deep" as it relates to a well is subjective. For consistency and to avoid
confusion as to whether a deep well is open to transition zone material or competent
bedrock, please refer in all descriptions to each well as alluvial/fluvial, saprolite,
transition zone, or bedrock. If one or more of these zones are relatively thick, contain
more than one discreet flow zone, and should be thought of as "upper" and "lower", that
qualifying designation is also appropriate (for example, upper transition zone and lower
transition zone if the two intervals represent discreet flow intervals).
7. Surface water and bed sediment sampling are limited or are not proposed in the GAP.
The Division expects base flow surface water and bed sediment sampling to be included
in the site assessment and the GAP. These data will provide information on surface water
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November 4, 2014
Page 5 of 11
quality and will be useful in efforts to understand the interaction of ground and surface
water at the site. Sample locations and distribution shall be based on site specific
considerations, but seepage areas, key tributaries, and ash ponds should be given special
emphasis. Surface water data collected by the Division during the March 2014 sampling
event, and existing ground and surface water data collected by Duke should be used in
the sample design and site assessment. '
8. It is expected that Duke conduct assessment work, including borings, wells, and surface
waterbed sediment sampling, offsite (outside of property boundaries) as needed for
adherence to 15A NCAC 02L.0106 (g)(4) and (or) for the evaluation of background
conditions. The plans as submitted do not adequately account for offsite assessment
work or provide a justification that offsite work is not needed. Proposed offsite
assessment locations should be described in the GAP.
9. It is expected that as data from wells, borings, and water samples are derived and
evaluated, Duke will identify and sample additional locations as needed to complete the
horizontal and vertical extent of impacts associated with coal ash to subsurface soils,
saprolite, bedrock, and the ground and surface water resources. These activities and
anticipated locations shall be proposed in the GAP and included in the assessment.
10. Please note that wells identified as "background" are subject to periodic review based on
an increased understanding of site chemistry and hydrogeologic conditions. If a well
currently identified or otherwise labeled as background does not, in fact, represent
background conditions, it shall be excluded from further consideration as "background".
The need for additional or replacement background wells shall be considered during site
assessment and (or) as outlined in the site specific comment section below. However, in
general, each facility must have a background well or wells screened or open to each of
the dominant flow systems that occur at the site that are associated with groundwater
contamination (e.g., alluvium, fluvial deposits, saprolite, transition zone, and (or)
competent bedrock). Each of these wells must represent ambient background conditions
unaffected by site or offsite activities. Offsite well placement will, in some cases, be
expected depending on the position and proximity of waste, compliance, and property
boundaries. At least four independent sampling events generally are needed for a well to
be used in formal statistical testing.
11. Quality control samples shall be proposed in the GAP. These shall include but are not
limited to, descriptions of field calibration procedures, collection of replicate
measurements, use of field blanks, use of "blind" quality control samples, etc.
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12. The analyte list for supply well sampling, compliance well sampling, and site assessment
sampling shall include, but is not limited to, the following:
Al, Sb, As, Ba, B, Be, Ca, Cd, Co, Cr, Cu, Fe, K, Pb, Mg, Mn, Mo, Hg, Na, Ni,
Se, Sr, Tl, V, Zn, Cl, SO4, total dissolved solids (TDS), alkalinity, bicarbonate,
carbonate, total suspended solids (TSS), turbidity, pH, temperature, specific
conductance (SC), dissolved oxygen (DO), oxidation reduction potential (ORP),
and water level (water level measurements in supply wells may be omitted if well
head hardware prevents ready access). In addition, total combined radium (Ra-
226 + Ra-228) shall be measured on at least one occasion in selected compliance
wells of highest concern at each facility. Note that 15A NCAC 02H 0804 requires
certification for field parameters.
The GAP shall include the sampling frequency for each sample type. Justification must
be provided for Division consideration for any sample types/locations in which a sample
frequency of one is proposed.
13. Duke shall list and provide a detailed description of each coal combustion residuals
(CCR) waste storage or disposal area (unit) at each facility. This description shall state
the following:
a) known or approximate quantities of CCR waste stored in the unit(s);
b) details of the operational history of the unit(s), including years of use, all
known waste types, methods of emplacement, rationale for formal or
informal closure, and methods of closure or abandonment;
c) whether the unit is already included in the facility's current NPDES
permit;
d) whether the unit was permitted and managed by an agency other than the
Division and pertinent details of that permit,
e) whether there are additional permitted or unpermitted waste storage areas
within CCR waste storage areas;
f) the location and distribution of any coal ash used as structural fill or other
construction (i.e. roadbeds, storage pads, berms, etc.) both on and offsite
(proximal to the site); and
g) whether the existing compliance boundary captures all the CCR waste
storage areas or if revisions need to be made.
Based on requirements specified in 15A NCAC 02L .0107 and a review of the
information discussed in a) to g) above, the Division will determine whether additional
units or areas need to be included in an existing or a new compliance boundary.
14. It is expected that the reporting limits associated with all analytical methods proposed in
the GAP be EPA approved and be at or below the state groundwater standards at 15A
NCAC 2L or surface water standards at 15A NCAC 2B.
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Duke Energy Carolinas, LLC - Buck
November 4, 2014
Page 7 of 11
15. 15A NCAC 02C .0108(p) specifies that each non -water supply well be developed such
that the level of turbidity or settleable solids does not preclude accurate chemical
analyses of any fluid samples collected. The GAP shall acknowledge and state that well
construction design will be based on site specific conditions and shall be actively
modified in the field (alternate screen slot size, use of well sock, or others, for example)
to accommodate the grain size of the formation, as needed td minimize turbidity or
address other unforeseen issues. Any deviations from originally proposed protocols shall
be fully documented and provided to the Division.
16. The GAP shall state that well development and purging protocols will be based on site
specific conditions and shall be actively modified in the field as needed to minimize
turbidity or address other unforeseen issues. In all cases, well development and purging
prior to sample collection shall be conducted to specific field standards which shall be
clearly stated in the GAP. Deviations from this protocol or from other proposed
development and purging protocols shall be fully documented and provided to the
Division. If the Division concludes that turbidity is impacting analytical results for any
reason, a replacement well will, in some cases, be required.
17. Duke shall contact adjacent property owners for site access as needed to complete the
assessment activities. If Duke is unable to obtain access from an owner, Duke shall
request liaison assistance from the Division in writing. This request shall include all
contact information, details of all prior discussions regarding access to the property for
purposes of conducting site assessment, and results of those discussions. Duke shall
provide the Division a copy of any formal access agreements proposed for use.
18. The statewide 1:500,000 geologic map is not a substitute for local, larger scale geologic
mapping and site scale geologic information where available. The GAP shall propose the
use of fracture trace analysis (where applicable) and onsite/near-site geologic mapping to
better understand site geology. The scope of these efforts shall depend upon site
conditions and existing geologic information.
19. If proposed, please provide a detailed rationale for the use of Rotosonic or similar drill
method and why it is appropriate for use in the site assessments. Please address any
potential issues (such as the consolidation of aquifer material in the vicinity of the well
screen) that could affect aquifer or groundwater analyses.
20. The purpose, methods, and numbers (including anticipated depths/flow zone(s) and,
where known, locations) of packer testing shall be clearly detailed in the GAP.
21. The use of statistics to help establish background concentrations of specific parameters
shall be based on site -specific data and shall follow the methods approved for use by the
Division. In most cases, the methods outlined in RCRA Unified Guidance (U.S. EPA,
2009, EPA 530/R-09-007) are considered to be appropriate for use at these sites.
Background wells deemed appropriate for use in statistical analyses must be approved by
the Division. Final background determinations are made by the Division Director based
on available data and information.
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22. As part of the GAP, provide an oversized summary table of all existing compliance and
voluntary well data collected to date at the site. Please place all constituents, including
DO, SC, ORP, and turbidity, as headings across the top of the table, and all wells and
sample dates as rows along the left side of the table. Highlight in yellow those values
that exceed a 2L standard. Please also include on this table any surface water, ash, and
(or) ash leachate data relevant to the site. This table should be included in the GAP and
also made available in electronic (Excel or similar) format.
23. As part of future site assessment reporting deliverables, provide at a minimum the
following tables, graphs, and maps:
a) box (whisker) plots, for locations sampled on four or more events (show
min, 25, 50, 75, max); align plots for multiple locations on one chart;
construct a similar chart for each constituent of concern (COC),
b) stacked time -series plots (for each COC, stack multiple wells/locations
using same x-axis to discern seasonal trends; construct similar chart for
each COC; consider also showing turbidity, DO, ORP, or other constituent
on plot to demonstrate influence,
c) piper and (or) stiff diagrams showing selected monitor wells, supply wells,
surface water locations, ash leachate as separate symbols,
d) correlation charts, where applicable,
e) orthophoto potentiometric maps for "like" flow zones (maps for bedrock
wells likely will be plotted on a different map than maps for transition
zone wells),
f) orthophoto potentiometric difference maps, showing the difference in
vertical heads between selected flow zones,
g) orthophoto iso-concentration maps for selected COCs and flow zones,
h) orthophoto map showing relationship between ground and surface water
samples for selected COC(s),
i) geologic cross sections,
j) photographed borings/core for each boring location, and
k) others as appropriate.
For summary statistics tables, avoid presenting "average" value(s) unless the
constituent(s) at the location in question is (are) normally distributed, in which case a
mean and standard deviation are acceptable. For non -normal data, use of the median
value is more appropriate. In either case, use of the maximum value is often misleading
if it is a formally -tested outlier or is associated with high turbidity; footnote maximum
values as appropriate.
24. With respect to the use of the terns "may" versus "will", the GAP shall use the term
"will" or clearly state, in detail, why the qualifying term "may" is used. In either case,
the Division reserves the right to request at any time additional work needed to meet site
assessment objectives. During the assessment, if Duke decides that additional work is
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needed at a facility, the Division shall be contacted immediately with a description of the
proposed work and timeline.
25. Any assumptions or timelines stated in the GAP shall not be used as justification to
circumvent the mandatory deadlines established by legislative order, Governor's
Executive Action, or NORR.
Additional Comments Specific to the Referenced Facility
26. GAP Figure 3 illustrates an "ash storage area" immediately adjacent to and east of the
"Cell 1 Additional Primary Pond". The same figure illustrates a "soil stockpile"
immediately south of the "ash storage area". Please refer to "All Facilities" comment 13
and provide a detailed description and additional information regarding these areas in the
GAP.
27. The GAP should include a discussion of whether ash is also present within the waters of
the Cell 3 Secondary Pond and Cell 2 Secondary Pond. If ash is present with these
ponds, the GAP should include a proposal for characterization of the ash within these
locations or an explanation as to why these samples are not needed or are unable to be
obtained.
28. The GAP proposed collecting native soil samples from immediately below the ash basins
and storage areas in the AB and AS series borings. Additional soil samples are also
proposed from three "background" boring/monitoring well locations, however no details
have been provided regarding from what depth intervals these soil samples will be
collected. The GAP should address this deficiency. Additionally, the GAP does not
propose plans to collect soil samples from the GWA series boring/monitoring well
locations because they will be located outside the waste boundary. Inclusion of soil
samples from the GWA series borings will provide additional characterization of soil
solid phase conditions outside the waste storage area and should be detailed in the GAP.
In addition to soil samples, the GAP should include a sufficient number of borings and
cores to understand, characterize, and (or) model subsurface conditions (both solid phase
and groundwater) at the site at all depths of interest. The current GAP lacks sufficient
detail, proposes an insufficient number of soil samples and a complete lack of bedrock
core samples for characterization of the site's subsurface conditions. Please refer to "All
Facilities" comments 3 and 4.
29. Three "background" borings/monitoring wells (BG-1S/D, BG-2S/D, BG-3S/D) are
proposed in the GAP to assist in characterizing the site. Background monitoring well
location BG-lS/D may be sufficiently located away from the influence of ash waste
storage areas depending on the findings of the planned assessment. Background
monitoring well locations BG-2S/D and BG-3S/D are located in areas which likely fall
within the influence of the ash storage areas based on exceedances of the 15A NCAC 2L
groundwater quality standards detected in existing nearby monitoring wells (MW-8S/D
and MW-13S/D). Although the locations of these "background" monitoring wells may
provide some useful information for the assessment efforts, they are unlikely to be
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representative of background conditions that are clearly outside the influence of the ash
waste storage areas. The GAP should propose off -site background locations which have
a higher likelihood of clearly reflecting soil and groundwater conditions beyond the
influence of the ash waste storage areas. Please refer to "All Facilities" comments 7, 8
and 9.
30. Samples periodically collected from compliance monitoring wells MW-8S/D, MW-6S,
MW-12S, and MW-13D, located at or close to Duke's property line, have shown
exceedances of the 15A NCAC 2L (2L) groundwater quality standards. These
exceedances have primarily consisted of iron and/or manganese, with chromium having
been detected only in 2011 in monitoring well MW-12S. The GAP lacks off -site
boring/monitoring well locations to delineate these exceedances to the south and
southeast of the facility. The GAP shall include sufficient borings/monitoring well nests
to characterize all zones of interest and this shall include off -site borings where necessary
to delineate exceedances of the 2L standards. Please refer to "All Facilities" comment 8
and 9.
31. The GAP includes ash basin surface water sampling at seven locations and ten selected
seep locations. No other surface waters or stream sediments sampling is discussed in the
GAP. Please refer to "All Facilities" comments 7, 8 and 9 and provide plans for
assessing the groundwater and surface water interactions at the site. Additionally,
although seep samples are proposed in on -site locations S-1 and S-2, the GAP shall
include investigation plans for off -site seeps in this general area previously identified
during the DWR/Duke 5/27/14 site visit.
Your assessment plan must be submitted to the DWR Mooresville Regional Office and Central
Office for review within 30 days of the receipt of this letter. A revised plan must be submitted
that fully incorporates the responses to the above comments rather than a letter response
intended to supplement the previously submitted plans.
Please note that failure to conduct a complete assessment pursuant to the above referenced rule
and statute will be considered a violation, subject to potential enforcement actions by the
Division.
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We appreciate your attention and prompt response in this matter. If you have questions, please
do not hesitate to call Bruce Parris at 704-663-1699.
Sincerely,
c
S. J� A, an, P.G., Chief
Water Quality Regional Operations Section
Cc: WQROS — MRO
WQROS — Central Office
Don van der Vaart
HDR (Attn: William Miller) 440 South Church Street, Suite 1000, Charlotte, NC 28202
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