NC0004961_RBSS CSA Rpt_Appx A_Intro_20150818

Appendix A
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

NCDENR
North Carolina Department of Environment and Natural Resources
Pat McCrory
Governor
February 19, 2015
Mr. Harry Sideris
Senior Vice -President
Environment, Health, and Safety
Duke Energy
526 South Church Street
Mail Code EC3XP
Charlotte, NC 28202
Re: Riverbend Steam Station
NPDES Permit No. NC0004961 — Gaston 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 GAP under the condition that the following deficient
items are addressed in the Groundwater Assessment Report:
• Comment Section 5.3 Hydrogeologic Site Characteristics:
The initial site conceptual site model (ISCM) section of the revised GAP does not provide a
clear, cohesive description of how constituents of potential concern (COPCs) may migrate
from the source(s) to the receptors through various pathways. It is acknowledged that there
is information available to develop an ICSM, but data are not presented in a manner such as
groundwater elevation maps, geologic maps, cross -sections that depict detailed site
conditions, flow diagrams, or in a tabulated format 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.
1636 Mail Service Center, Raleigh, North Carolina 27699-1636
Phone: [phone]Internet: http://www.ncwater.org
An Equal Opporlunity1Affirrnative Action Employer — Made in pad by recycled paper

Riverbend Steam Station
February 19, 2015
Page 2 of 3
• Comment 7.1.3 Deep Monitoring Wells and Comment Section 7.1.4 Bedrock Monitoring
Wells:
The Division suggests installing a cluster of monitoring wells that are screened across
various flowpaths (shallow aquifer, transition zone/partially weathered bedrock and within
bedrock) near the compliance boundary at a location approximately 200 feet north of existing
monitoring well MW-9. Additional monitoring wells that are screened within the transition
zone/partially weathered rock and within bedrock are also suggested in the immediate
vicinity of existing monitoring well MW-15. These locations will provide more data adjacent
to the Catawba River 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.
• 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 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 Division's 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 the Division's March 2014
seep and surface water sampling data indicated exceedances or elevated concentrations of
iron, manganese and other constituents of concern 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, 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 1, 2015 and the
Groundwater Assessment Report is due on August 18, 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].

Riverbend Steam Station
February 19, 2015
Page 3 of 3
Sincerely,
>
I pow
S. Jay Zimmerman, P.G., Acting Director
Division of Water Resources
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
Page 2 of 6
5. 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 November4, 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
PHREECIC 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 forgroundwater 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

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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.
5. 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 (WLs 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.

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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.
S. 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.pho/­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

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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 overtime 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 DWO, 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.
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
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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.
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
Provide references for guidance and potential sampling methodology related to conducting a
baseline ecological risk assessment or habitat assessment, if warranted.

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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
c hemicals, 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.
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 .
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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);
 Surfac e 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.
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 Discuss geographical setting and present/future surrounding land uses.
E. Receptor Information

 Provide a site map showing labeled well locations within a 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, in clude 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:
 Call the city/county water department to inquire about city water connections;
 Visit door -to-door (make sure that you introduce yourself and state your
purpose to residents prior to exam ining 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 ,
 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 ne arest public water lines
and the source(s) of the public water supply;
 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 wellhe ad 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
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
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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 t he Public
Water Supply Section at (919) 707 -9083;
 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 surfi cial 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 di stance 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 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.
 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 Supp ly 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 rece ptors 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 priv ate 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 m ap 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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 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 prov ided 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 delet ion 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 a re 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 comp onents 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 CAM A
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 p resentation does not have to follow a prescriptive format; however,
documentation of relevant water supply well receptor information is expected by the
Division to support evaluat ion of potential risk to receptors and conceptual site models .
Data requirements related to Section E Receptor Information that should be considered
include :
 T he Division acknowledges the difficulty with determining the k nown extent of
contamination at this time since potential plume assessments are not complete .
With this in mind, the Div i sion 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. T he Division may request
additional data after review of well receptor and water quality data in a CSA
report.
 In general, s ubsurface 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 si te conditions such
the possibility of a shallow, perched, or fluctuating water table resulting from site
operations intercepting subsurface utilities must be documented. I f the utility
mapping requirements are modified , Duke Energy must be able to document tha t
the subsurface utilities are not potential preferential pathways for contaminant
migration in the CSA reports.
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 A determination of whether the contaminated area is located in an area where
there is recharge to an unconfined or semi -confined deeper aquife r 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 im pacts
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 identificati on 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 rational e 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 analytical results that exceed the applicable cleanup 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 2L 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_library/get_file?uuid=0f601ffa-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 2L 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: http://www.epa.gov/oswer/riskassessment/pdf/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:
 Locati on 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 an alyses;
 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 conducti vity;
 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

 71/2 minute USGS topographic quadrangle map showing an area 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 sourc e for drinking water;
 The CSA Report Figures will include a 7½ 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;
 w ater 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 not ed 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 dr inking 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;
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.
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 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 gr oundwater 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 ve rtical 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 datu m (arbitrary 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".
 The CSA Report Figures (plan views), as applicable, will b e 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 boundari es;
 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 analyt ical results (subjectively as supportive
of conveying findings while affording depiction clarity);
 separate groundwater contaminant iso -concentration contour maps for
constituents exceeding 2L standards with c ontour line for applicable 2L standard
shown bo ld (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 e levation 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 c ross -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 whil e affording depiction clarity);
 groundwater contaminant iso -concentration contours 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 Positi on:
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 rev iew of the CSA
reports. If the Division’s review of a CSA report indicates data presentation relat ed 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 d irection 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. I n a ddition, the Division Regional
Offices m ay 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 identif ied in the USEPA April 2015 Final R uling 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 2 015 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 vanad ium 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
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 distanc e 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 ex pected to
migrate; 2,640 feet (one -half mile) from th e 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 i ncluding sample location; date of
sampling; sample collection procedures (briefly/concisely as “bailer”, “pump”, etc.);
sample identifications; sample analyses; and sample analytical results (list
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,
scree ned 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
O 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 O 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 form for CSA .
 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.
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
Conditional Approval Letters states the following:
“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 flowpath transects and in wells where these constituents exceed 2L
groundwater standards as well as for surface water samples collected within ash impoundments.”
After conversations with risk assessors and other technical leads with our consulting agencies, Duke Energy plans the
following as it relates to speciation sampling for the groundwater assessments:"

Since speciation of groundwater and surface water samples is a critical component of both the site assessments and corrective
action, the Division expects a geochemical site conceptual site model (CSM) developed as a subsection in the Comprehensive
Site Assessment (CSA) Reports. The geochemical CSM should provide a summary of the geochemical interactions between the
solution and solid phases along the groundwater flowpath that impact the mobility of metal constituents. At a minimum, the
geochemical CSM will describe the adsorption/desorption and mineral precipitation/dissolution processes that are believed to
impact dissolved concentrations along the aquifer flowpaths away from the ash basin sources. The model descriptions should
include the data upon which the conceptual model is based and any calculations (such as mineral saturation indices) that are
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)
• At wells located along proposed flow-path transects and at surface water sample locations within the ash basins:
o Collect samples and perform speciation for the following constituents and oxidation states: Fe(II, III), Mn(II,III),
As(III,V), Cr(III,VI), Se (-II,IV,VI).
• At compliance wells where 2L exceedances have been measured (and are not related to turbidity):
o Perform speciation for the constituent with the measured exceedance if the constituent has a speciation state(s) that
may affect toxicity or mobility.
• Existing background wells that have historically had 2L exceedances of speciation constituents and all newly installed
background wells
o Collect samples and perform speciation for the following constituents and oxidation states: Fe(II, III), Mn(II,III),
As(III,V), Cr(III,VI), Se (-II,IV,VI).

The Division agrees with the overall approach presented for Round 1 of groundwater sampling since it is consistent with the
direction provided in Attachment 1 of the GAP Conditional Approval Letters. However as stated in the GAP Conditional Letters
of Approval, the Division reserves the right to request additional data to complete the CSA if a determination is made that
there is insufficient data to evaluate site conditions, including speciation of groundwater samples.
Clarification of the Division's expectations with respect to the specific proposed direction for CSA Round 1 groundwater
sampling is provided below:

First bullet: Add Mn (IV) to the speciation list for wells along the flow-path transects.

Second bullet: The Division acknowledges that turbidity is problematic with respect to obtaining representative groundwater
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)
• Any well where 2L exceedances were measured in the sampling reported in the CSA:
o Collect samples and perform speciation for the following constituents and oxidation states: Fe(II, III), Mn(II,III),
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
speciation state(s) that may affect toxicity or mobility.
• Existing background wells that have historically had 2L exceedances of speciation constituents and all newly installed
background wells
o Collect samples and perform speciation for constituents with the measured exceedances from Round 1 if the
constituent has a speciation state(s) that may affect toxicity or mobility.
The Division agrees with the overall approach presented for Round 2 of groundwater sampling since it is consistent with the
direction provided in Attachment 1 of the GAP Conditional Approval Letters. However as stated in the GAP Conditional Letters
of Approval, the Division reserves the right to request additional data to complete the CSA if a determination is made that
there is insufficient data to evaluate site conditions, including speciation of groundwater samples.
Clarification of the Division's expectations with respect to the specific proposed direction for CSA Round 2 groundwater
sampling is provided below:

First bullet: Sample wells and surface water locations situated on groundwater flow-paths as well as wells that exhibited
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

Riverbend Steam Station Ash Basin
Proposed Groundwater
Assessment Work Plan
(Rev.1)
NPDES Permit NC0004961

December 30, 2014

Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Riverbend Steam Station Ash Basin
Table of Contents

i
Table of Contents
Table of Contents ......................................................................................................................... i
Executive Summary .............................................................................................................. 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 ASH STORAGE AREA .................................................................................12
5.1.3 CINDER 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 and Observation Wells .........................................22
7.1.3 Deep Monitoring Wells .................................................................................24
7.1.4 Bedrock Monitoring Wells .............................................................................24
7.1.5 Well Completion and Development ..............................................................25
7.1.7 Compliance and Voluntary Monitoring Wells ................................................27
7.1.8 Onsite Water Supply Wells ...........................................................................27
7.2 Groundwater Sampling and Analysis .......................................................................27
7.2.1 Compliance and Voluntary Monitoring Wells ................................................29
7.2.2 Onsite Water Supply Wells ...........................................................................29
7.2.3 Speciation of Select Inorganics ....................................................................29
7.3 Surface Water, Sediment, and Seep Sampling ........................................................29
7.3.1 Surface Water Samples ...............................................................................29
7.3.2 Sediment Samples .......................................................................................30
Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Riverbend Steam Station Ash Basin
Table of Contents

ii
7.3.3 Seep Samples ..............................................................................................30
7.4 Field and Sampling Quality Assurance/Quality Control Procedures .........................30
7.4.1 Field Logbooks .............................................................................................31
7.4.2 Field Data Records ......................................................................................31
7.4.3 Sample Identification ....................................................................................31
7.4.4 Field Equipment Calibration .........................................................................31
7.4.5 Sample Custody Requirements ....................................................................32
7.4.6 Quality Assurance and Quality Control Samples ..........................................33
7.4.7 Decontamination Procedures .......................................................................34
7.5 Site Hydrogeologic Conceptual Model .....................................................................35
7.6 Site-Specific Background Concentrations ................................................................36
7.7 Groundwater Fate and Transport Model ..................................................................36
7.7.1 MODFLOW/MT3DMS Model ........................................................................36
7.7.2 Development of Kd Terms ............................................................................38
7.7.3 MODFLOW/MT3DMS Modeling Process .....................................................39
7.7.4 Hydrostratigraphic Layer Development ........................................................41
7.7.5 Domain of Conceptual Groundwater Flow Model .........................................41
7.7.6 Boundary Conditions for Conceptual Groundwater Flow Model ....................42
7.7.7 Groundwater Impacts to Surface Water .......................................................42
8.0 Risk Assessment.................................................................................................................44
8.1 Human Health Risk Assessment ..............................................................................44
8.1.1 Site-Specific Risk-Based Remediation Standards ........................................45
8.2 Ecological Risk Assessment ....................................................................................46
9.0 CSA Report .........................................................................................................................49
10.0 Proposed Schedule ...........................................................................................................51
11.0 References ........................................................................................................................52

Appendix A – Notice of Regulatory Requirements Letter from John E. Skvarla, III, Secretary,
State of North Carolina, to Paul Newton, Duke Energy, dated Aug ust 13, 2014.
Appendix B – 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.
Appendix C – Site Plan with Cross-sections Riverbend Steam Station Ash Basin Duke Energy
Carolinas, LLC Gaston County, NC, Figures 4.1-3, 4.1-4, and 4.1-5, May 31,
2013; Cross-sections A-A’, B-B’, C-C’
Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Riverbend Steam Station Ash Basin
Table of Contents

iii

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. Ash Analytical Results
6. Surface Water Analytical Results
7. Seep Analytical Results
8. Environmental Exploration and Sampling Plan
9. Soil and Ash Parameters and Constituent Analytical Methods
10. Groundwater, Surface Water, and Seep Parameters and Constituent Analytical Methods

Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Riverbend Steam Station Ash Basin
EXECUTIVE SUMMARY

ES-1
Executive Summary
Duke Energy Carolinas, LLC (Duke Energy), owns and formerly operated the Riverbend Steam
Station (RBSS), located in Gaston County near the town of Mt. Holly, North Carolina (see Figure
1). RBSS began operation in 1929 as a coal-fired generating station. Subsequently, RBSS was
decommissioned and taken offline in April 2013. The coal ash residue from RBSS’s coal
combustion process was historically disposed of in the station’s ash basin located adjacent to
the station and Mountain Island Lake. 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
NC0004961.
Duke Energy has performed voluntary groundwater monitoring around the ash basin from
December 2008 until June 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 December 2010. 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 (Appendix A). 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 RBSS 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 (Appendix B). 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 RBSS work plan and
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site. This Revised GAWP has been prepared to address the general and site-specific
comments made by NCDENR in the November 4, 2014, letter.
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 30 ]nested
monitoring well pairs (shallow and deep), 4 wells in the ash basin with the screens located
bracketing the porewater surface and at the bottom of the ash, 2 observation wells (no water
quality samples collected), 11 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 April 2014 (as part of Duke Energy’s NPDES permit renewal application) to evaluate
potential impacts to groundwater and surface water.
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.

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1.0 Introduction
Duke Energy Carolinas, LLC (Duke Energy), owns and formerly operated the Riverbend Steam
Station (RBSS), located in Gaston County near the town of Mt. Holly, North Carolina (see Figure
1). RBSS began operation in 1929 as a coal-fired generating station. Subsequently, RBSS was
decommissioned and taken offline in April 2013. The coal ash residue from RBSS’s coal
combustion process was historically disposed of in the station’s ash basin located adjacent to
the station and Mountain Island Lake. 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
NC0004961.
Duke Energy has performed voluntary groundwater monitoring around the ash basin from
December 2008 until June 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 December 2010. 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 RBSS 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
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2
owners of coal combustion residuals surface impoundments.
(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 RBSS
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 RBSS. 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.
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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;
(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.

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2.0 Site Information
2.1 Plant Description
RBSS is a former coal-fired electricity generating facility with a capacity of 454 megawatts
located near the town of Mt. Holly in Gaston County, North Carolina. As of April 2013, all of the
coal-fired units have been retired. The site is located between the south bank of the Catawba
River on Mountain Island Lake and the north side of Horseshoe Bend Beach Road. The
surrounding area generally consists of residential properties, undeveloped land, and Mountain
Island Lake. Horseshoe Bend Beach Road runs from west to east in the vicinity of the site and
is located along a topographic divide. The topography at the site slopes downward from that
divide toward Mountain Island Lake.
The seven-unit station began commercial operation in 1929 with two units and then expanded to
seven by 1954. During its final years of operation, RBSS was considered a cycling station and
was brought online to supplement energy supply when electricity demand was at its highest.
The entire RBSS site is approximately 340.7 acres in area. In addition to the power plant
property, Duke Energy operates Mountain Island Lake as part of the Catawba-Wateree
Hydroelectric Project (FERC Project No. 2232). Mountain Island Lake is part of the Catawba-
Wateree project and is used for hydroelectric generation, municipal water supply, and
recreation. Duke Energy has performed a review of property ownership of the FERC project
boundary property within the ash basin compliance boundary (described in Section 2.3). The
review indicated that Duke Energy owns the lake bottom of Mountain Island within the FERC
project boundary and within the compliance boundary, as shown on Figure 2.
2.2 Ash Basin Description
The ash basin system at the plant was used to retain and settle ash generated from coal
combustion at RBSS. The ash basin system consists of a Primary and a Secondary Cell,
separated by an intermediate dike. The ash basin at RBSS originally consisted of a single-cell
basin commissioned in 1957 and was expanded in 1979. The single basin was divided by
constructing a divider dike to form two separate cells in 1986.
The ash basin is located approximately 2,400 feet to the northeast of the power plant, adjacent
to Mountain Island Lake, as shown on Figure 2. The Primary Cell is impounded by an earthen
embankment dike, referred to as Dam #1 (Primary), located on the west side of the Primary
Cell. The Secondary Cell is impounded by an earthen embankment dike, referred to as Dam #2
(Secondary), located along the northeast side of the Secondary Cell. The toe areas for both
dikes are in close proximity to Mountain Island Lake.
The surface area of the Primary Cell is approximately 41 acres with an approximate maximum
pond elevation of 724 feet. The Primary Cell contains approximately 1,924,679 cubic yards of
coal combustion product (CCP) material. The surface area of the Secondary Cell is
approximately 28 acres with an approximate maximum pond elevation of 714 feet. The
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Secondary Cell contains approximately 677,600 cubic yards of CCP material. The full pond
elevation of Mountain Island Lake is approximately 646.8 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 which predominantly received inflows from the ash
removal system, station yard drain sump, and stormwater flows. During station operations,
inflows to the ash basin were highly variable due to the cyclical nature of station operations.
The inflows from the ash removal system and the station yard drain sump are discharged
through sluice lines into the Primary Cell. The discharge from the Primary Cell to the Secondary
Cell is through a concrete discharge tower located near the divider dike.
Although the station is retired, wastewater effluent from other non-ash-related station
discharges to the ash basin is discharged from the Secondary Cell, through a concrete
discharge tower, to Mountain Island Lake. The concrete discharge tower drains through a 30-
inch-diameter corrugated metal pipe into a concrete-lined channel that discharges to Mountain
Island Lake. The ash basin pond elevation is controlled by the use of concrete stop logs.
2.3 Regulatory Requirements
The NPDES program regulates wastewater discharges to surface waters to ensure that surface
water quality standards are maintained. The RBSS site is permitted to discharge wastewater
under NPDES Permit NC0004961, which authorizes discharge from the ash basin to the
Catawba River (Mountain Island Lake) 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 RBSS site became effective on March 1, 2011, and
expires February 28, 2015.
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 December 2010. The existing compliance groundwater monitoring system for the
ash basin consists of the following monitoring wells: MW -7SR, MW -7D, MW-8S, MW -8I, MW-
8D, MW -9, MW -10, MW -11SR, MW -11DR, MW -13, MW -14, and MW -15. All the compliance
wells were installed in 2010.
NPDES Permit Condition A (11), Version 1.1, dated June 15, 2011, lists the parameters and
constituents measured and analyzed, and the requirements for sampling frequency and
reporting results (Table 1).
The compliance boundary for groundwater quality at the RBSS 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
the ash basin compliance monitoring wells, the ash basin waste boundary, and the compliance
boundary are shown on Figures 2 and 3. Note that monitoring wells MW -1S, MW-1D, MW-2S,
MW -2D, MW -3S, MW -3D, MW -4S, MW -4D, MW-5S, MW -5D, MW-6S, and MW -6D were
installed by Duke Energy in 2006 as part of a voluntary monitoring system. Samples are
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currently being collected from monitoring wells MW-4S, MW -4D, MW -5S, and MW -5D as part of
groundwater assessment efforts. No samples are currently being collected from the other
voluntary wells.
The locations for the compliance groundwater monitoring wells were approved by the NCDENR
DWR Aquifer Protection Section (APS). All of these existing compliance monitoring wells are
sampled three times per year (in February, June, and October). Analytical results are submitted
to the DWR before the last day of the month following the date of sampling for all compliance
monitoring wells except MW -9, MW-10, and MW -13.
One or more groundwater quality standards (2L Standards) have been exceeded in
groundwater samples collected at monitoring wells MW -7SR, MW -7D, MW-8S, MW -8I, MW -8D,
MW -9, MW -10, MW -11SR, MW -11DR, MW -13, MW-14, and MW -15. Exceedances have
occurred for pH, iron, and manganese. MW -7D also has had an exceedance of the interim
maximum allowable concentration (IMAC) groundwater quality standard for antimony. Table 2
presents exceedances measured from March 2011 through July 2014.
Monitoring wells MW -9, MW -10, and MW-13 are located inside of the compliance boundary as it
was not possible to access the compliance boundary at these three locations. Therefore, these
monitoring wells are installed inside of the 500-foot compliance boundary. These monitoring
wells are also sampled three times per year, and compliance with 2L Standards is determined
by using predictive calculations or a groundwater model to demonstrate compliance. For these
three monitoring wells, the NPDES permit allows prediction of the concentrations at the
compliance boundary to be performed by use of a groundwater model.
Monitoring wells MW -7SR and MW -7D are located to the southeast of the Primary Cell and are
considered to represent back groundwater quality. Monitoring wells MW -8S, MW -8I, and MW-
8D are located to the south of an ash storage area and to the north of Horseshoe Bend Beach
Road. Monitoring well MW -9 is located to the north of a cinder storage area. MW-10 is located
downgradient of the Primary Cell. Monitoring wells MW -11SR and MW -11DR are located
northwest of the dike dividing the Primary Cell and the Secondary Cell. Monitoring wells MW -
13, MW -14, and MW -15 are located downgradient of the Secondary Cell. With the exception of
monitoring wells MW -9, MW -10, and MW-13, the ash basin compliance monitoring wells were
installed at or near the compliance boundary.
Monitoring wells MW -7SR, MW -8S, MW -9, MW-10, MW-11SR, MW-13, MW-14, and MW-15
were installed by rotary drilling methods using hollow stem augers, with the well screen installed
above auger refusal to monitor the shallow aquifer within the saprolite layer. The screen lengths
for these wells range from 15 feet to 20 feet. Monitoring well MW-8I was also installed by rotary
drilling methods using hollow stem augers, with the well screen installed at an intermediate
depth in the surficial aquifer at 98 feet to 118 feet below ground surface (bgs). The screen for
monitoring well MW -8D was installed above auger refusal. The 5-foot long screen for
monitoring well MW -11DR was installed in the fractured bedrock zone immediately below auger
refusal (MACTEC, 2011). Monitoring well MW -7D was installed using hollow stem augers and
mud rotary drilling techniques to complete the well with a 5-foot long well screen from 95 feet
bsto 100 feet bgs within the fractured bedrock zone (ARCADIS G&M of North Carolina, 2007).
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3.0 RECEPTOR INFORMATION

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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 RBSS 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

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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 RBSS 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 miles 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 feet 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 3 percent. Secondary porosity of crystalline
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bedrock due to weathering and fractures ranges from 1 to 10 percent (Freeze and Cherry,
1979); but, porosity values of 1 percent to 3 percent are more typical (Daniel and Sharpless,
1983). Daniel (1990) reported that the porosity of the regolith ranges from 35 percent 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 inches to 9.7 inches per year
(Daniel, 2001).

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5.0 Initial Conceptual Site Model
The following Initial Conceptual Site Model (ICSM) has been developed for the RBSS 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.
5.1 Physical Site Characteristics
The original ash pond at the RBSS consisted of a single-cell basin commissioned in 1957 and
was expanded in 1979. The single basin was divided by constructing a divider dike to form two
separate cells in 1986. The Primary Cell is impounded by an earthen embankment dike,
referred to as Dam #1 (Primary), located on the west side of the Primary Cell. The Se condary
Cell is impounded by an earthen embankment dike, referred to as Dam #2 (Secondary), located
along the northeast side of the Secondary Cell. The toe areas for both dikes are in close
proximity to Mountain Island Lake.
Topography at the RBSS site ranges from an approximate high elevation of 786 feet near the
south edge of the property near Horseshoe Bend Beach Road to an approximate low elevation
of 646 feet at the interface with Mountain Island Lake on the northern extent of the site.
Topography generally slopes from a south to north direction with an elevation loss of
approximately 140 feet over an approximate distance of 3,500 feet. Surface water drainage
generally follows site topography and flows from the south to the north across the site except
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where natural drainage patterns have been modified by the ash basin or other construction.
Unnamed drainage features are located on the eastern and northwestern portions of the site
and generally flow north to Mountain Island Lake.
The approximate maximum pond elevation of the Primary Cell is 724 feet. The Secondary Cell
has an approximate maximum pond elevation of 714 feet. The full pond elevation of Mountain
Island Lake is approximately 646.8 feet.
In addition to the ash basin, an unlined dry ash storage area is located topographically
upgradient and adjacent to the southeast side of the Primary Cell.
A cinder storage area is located immediately west/southwest of the Primary Cell and northwest
of the dry ash storage area.
The Primary Cell, Secondary Cell, dry ash storage area, and cinder storage area are shown on
Figures 2 and 3.
5.1.1 ASH BASIN
Coal ash residue from the coal combustion process was disposed in the RBSS ash basin from
approximately 1957 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.
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 Mountain Island Lake.
The discharge flow from the Primary Cell enters the Secondary Cell via a concrete discharge
tower located in the northern portion of the cell near the divider dike. Flow is discharged from
the Secondary Cell to Mountain Island Lake through a concrete discharge tower located in the
southeast portion of the Secondary Cell. The concrete discharge tower drains through a 30-
inch-diameter corrugated metal pipe into a concrete-lined channel that discharges to Mountain
Island Lake.
The approximate maximum pond elevation of the Primary Cell is 724 feet. The Secondary Cell
has an approximate maximum pond elevation of 714 feet. The full pond elevation of Mountain
Island Lake near the site is approximately 646.8 feet. The ash basin pond elevations are
controlled by the use of concrete stop logs in the two discharge towers.
The area contained within the waste boundary for the Primary Cell encompasses approximately
41 acres. The Secondary Cell encompasses approximately 28 acres. For purposes of
delineating the waste boundary, the Primary Cell, Secondary Cell, Ash Storage Area, and
Cinder Storage Area are considered a single waste disposal area, encompassing approximately
134.7 acres. The ash basin waste boundary is shown on Figures 2 and 3.
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 and stormwater flows. Currently, Duke Energy is
evaluating alternatives from removing these flows from the ash basin in order to allow total
decommissioning of the ash basin.
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5.1.2 ASH STORAGE AREA
An unlined dry ash storage area is located topographically upgradient and adjacent to the
southeast side of the Primary Cell. The footprint is approximately 29 acres and is estimated to
contain approximately 1.5 million tons of CCR material. The ash storage area was constructed
during two ash basin clean-out projects: one which occurred around 2000-2001 and the more
recent which occurred from late 2006 to early 2008. The clean-out projects were performed to
provide additional capacity in the ash basins for future sluiced ash. The storage area currently
has a 1.5 to 2 foot soil cover and vegetation that has been maintained following the last
deposition in this area. For the purpose of water management, the stormwater runoff from the
ash storage area is routed to the ash basin system. Per Duke Energy’s November 13, 2014
proposed Coal Ash Excavation Plan for the Riverbend Steam Station, Phase I of the Excavation
Plan will include the excavation and removal of approximately 1.0 million tons of CCR material
from the storage area. Subsequent phase(s) of excavation will remove the remaining ash in this
area of the site. Ash removed from the site will be transported by the contractor to properly
permitted facilities. The ash placement location will be properly managed and maintained to
ensure environmental compliance with all applicable rules and regulations.
5.1.3 CINDER STORAGE AREA
The cinder storage area is located topographically upgradient and immediately west/southwest
of the Primary Cell, and northwest of the dry ash storage. The footprint is approximately 13
acres and is located in a triangular area northeast of the coal pile and northwest of the rail spur.
Following initial station operation and prior to initial ash basin operation in 1957, bottom ash
(cinders), generated as part of the coal combustion process, were deposited in a primarily dry
condition in the cinder storage area and other areas near the cinder storage area and coal pile.
This area was utilized for storage of ash material at the station prior to the installation of
precipitators and a wet sluicing system. The cinder storage area contains predominantly dry
cinders and is currently covered with dense vegetation. The storage area is estimated to
contain approximately 300,000 tons of CCR material. Per Duke Energy’s November 13, 2014
proposed Coal Ash Excavation Plan for the Riverbend Steam Station, the CCR material
contained within the cinder storage area will be removed.
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 percent to 80 percent of the ash produced during
coal combustion is fly ash (EPRI 1993). Typically 65 percent to 90 percent 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.
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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 percent 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 percent of the mineral component, while trace constituents such as arsenic,
cadmium, lead, mercury, and selenium make up less than approximately 1 percent 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).
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.
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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.
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 metamorphosed quartz diorite and
tonalite. The tonalite unit is described as gray, usually medium- to coarse-grained, generally
foliated rock composed dominantly of plagioclase, quartz biotite, hornblende, and epidote. 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 parts per million [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 included in soil boring and monitoring well installation logs provided
by Duke Energy (ARCADIS G&M of North Carolina, Inc., 2007 and MACTEC, 2011), subsurface
stratigraphy consists of the following material types: fill, ash, residual soil, saprolite, alluvium,
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partially weathered rock (PWR), and bedrock. In general, residual soil, saprolite, and PWR
were encountered on most areas of the site. Alluvium was encountered in borings advanced
along the northeastern extent of the Secondary Cell, within close proximity to Mountain Island
Lake. Bedrock was encountered sporadically across the site ranging in depth from 34 feet on
the northern extent of the site to greater than 200 feet on the southern extent of the site near
Horseshoe Bend Beach Road.
Cross-sections depicting the hydrostratigraphic units were developed for the preliminary ash
basin assessment. The site plan and cross-sections are shown in Appendix C.
The general stratigraphic units, in sequence from the ground surface down to boring
termination, 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 presumably as cover for the ash storage area.
 Ash – Although previous exploration activities, for which Duke Energy provided boring
logs, did not evaluate ash management areas of the site, ash is expected to be present
within the ash basins and ash and cinder storage areas.
 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 three
boring locations at the base of the northern embankment of the Secondary Cell, proximal
to Mountain Island Lake. Alluvium in these borings was described as yellowish-red to
reddish-yellow silty clay to clayey sand with well-rounded quartz pebbles.
 Residual Soil – The soil that develops by in-place weathering and consists of white,
orange, tan, brown, gray, or black sandy clay to clayey 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 white to brownish
yellow to greenish gray with quartz and potassium feldspar fragments.
 Bedrock – Bedrock was encountered in three deep borings completed around the
northern extent of the Secondary Cell and the western extent of the Primary Cell. Depth
to top of bedrock ranged from 34 feet to 51 feet below ground surface (bgs). Bedrock
was described as granite, quartzite and gneiss.
Hydraulic conductivity in these hydrostratigraphic units can vary, but is generally thought to fall
within the ranges provided in below where Kh refers to hydraulic conductivity in the horizontal
direction and Kv refers to hydraulic conductivity in the vertical direction:

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HYDRAULIC CONDUCTIVITIES
Hydrostratigraphic Unit Range of k Values (cm/sec)
Fill (Kh)2 1.0E-06 to 1.0E-04
Ash (Kh)1,3 1.0E-06 to 1.0E-04
Ash (Kv)4 2.8E-05 to 1.2E-04
Alluvium (Kh)1,3 1.3E-06 to 2.7E-03
Residual Soil/Saprolite (Kh)1,3 9.7E-07 to 1.8E-02
Partially Weathered / Fractured
Rock – TZ (Kh)1,3 1.9E-06 to 3.3E-02
Bedrock (Kh)1,3 1.8E-07 to 9.9E-03

Notes:
1. Data from in-situ permeability tests at ash basins located within the Carolina Piedmont.
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 BSS (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. 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 RBSS 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 Horseshoe Bend Beach Road to the south of the ash basin. This
topographic divide likely also functions as a groundwater divide. Mountain Island Lake 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 Mountain Island Lake.
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 RBSS 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 Mountain Island Lake.
Following completion of the groundwater assessment work, a site conceptual model will be
developed, as described in Section 7.5.

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6.0 Compliance Groundwater Monitoring
As described in Section 2.3, groundwater monitoring is required as a condition of the NPDES
permit. From December 2010 through October 2014, the compliance groundwater monitoring
wells at the RBSS site have been sampled a total of 13 times. During this period, these
monitoring wells were sampled in:
 December 2010
 February 2011
 June 2011
 October 2011
 February 2012
 June 2012
 October 2012
 February 2013
 June 2013
 October 2013
 February 2014
 June 2014
 October 2014
Note that compliance monitoring wells MW -11DR, MW -11SR, and MW-15 were first sampled in
February 2011. With the exception of iron, manganese, antimony, and pH, the results for all
monitored parameters and constituents were less than the 2L Standards. Table 2 lists the
range of exceedances for iron, manganese, antimony, and pH for the period of December 2010
through October 2014.
HDR previously completed an initial groundwater assessment of the 2L Standard exceedances
in the compliance monitoring wells at RBSS through the February 2013 sampling event (HDR,
2013). The results and recommendations from this assessment report will be used during the
groundwater assessment required by the NORR.
All available groundwater quality data for compliance and voluntary monitoring wells (as
mentioned above and shown on Figure 2) are summarized on Table 4. Ash quality data are
provided in Table 5. Surface water quality data are provided in Table 6. Seep analytical results
are provided in Table 7.
Compliance groundwater monitoring will continue as scheduled in accordance with the
requirements of the NPDES permit.

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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,
 Groundwater samples from the existing compliance and voluntary 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 basin,
 Seep samples from locations identified as part of Duke Energy’s NPDES permit renewal
application (from April 2014), and
 Groundwater samples from the existing onsite water supply wells.
In addition, hydrogeologic evaluation testing will be conducted during and following monitoring
well installation activities, as described in Section 7.1.6. Historical groundwater quality data
from compliance monitoring wells and voluntary 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 8. The proposed
sampling locations are shown on Figure 3.
Groundwater samples collected from compliance monitoring wells MW -8S, MW -8I, and MW -8D
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. 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 (GWA-20 through
GWA-23) will be installed to delineate the extent of the exceedances. One of 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.
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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 8.
For nested monitoring wells, the deep monitoring well boring will be utilized for characterization
of subsurface materials and a sample 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 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 eight locations within the Primary Cell, on the Primary and
Secondary Cell dams, and on and adjacent to the intermediate dike (designated as AB-1
through AB-8), at three locations within the Ash Storage Area located immediately
south/southwest of the Primary Cell (designated as AS-1 through AS-3), and at two locations
within the Cinder Storage Area located west of the Primary Cell and northwest of the Ash
Storage Area (designated as C-1 and C-2). In addition, 13 soil borings (designated as GWA-1
through GWA-10 and BG-1 through BG-3) will be completed outside of ash management areas
to provide additional soil quality data. Soil borings will be completed at GWA-20 through GWA-
23, if these borings are determined to be necessary based on the evaluation described in
Section 7.0.
Field data collected during boring advancement will be used to evaluate:
 Presence or absence of ash,
 Areal extent and depth/thickness of ash, and
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 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
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, ASH STORAGE, AND CINDER STORAGE AREAS
In areas where ash is known or suspected to be present (i.e., AB-, AS-, and C-borings), solid
phase samples will be collected for laboratory analysis from the following intervals in each
boring:
 Shallow Ash – approximately 3feet bgs to 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 feet to 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 9.
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 the Primary and Secondary Cells
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 boing location on ash areas
where saturated ash presents stability issues. If this occurs, ash samples collected from other
safely accessible areas within the Primary Cell and on the dikes will be utilized to characterize
the ash within the basin.
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BORINGS OUTSIDE ASH BASIN, ASH STORAGE, AND CINDER STORAGE AREAS
Borings located outside of the ash basin, ash storage, and ash cinder storage areas are
designated as GWA- and BG- borings.
The GWA soil samples will be used to provide additional characterization of soil conditions
outside the ash basin and ash storage. Solid phase samples will be collected for laboratory
analysis from the following intervals in each boring:
 Approximately 2 feet to 3 feet above the water table,
 Approximately 2 feet to 3 feet below the water table,
 Within the saturated upper transition zone material (if not already included in the two
sample intervals above), and
 From a primary, open, and 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 10-foot intervals until reaching the water table (i.e., 0-2 feet, 10 feet to
12 feet, 20 feet to 22 feet, and so forth),
 Approximately 2 feet to 3 feet above the water table,
 Approximately 2 feet to 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:
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 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
The select split-spoon samples are anticipated to be collected from the following boring
locations:
 Fill – AB-1S/D, AB-2S/D, AB-3S/D, AB-4S/D, and AB-5S/D
 Ash – AB-5S/D, AB-7S/D, AS-2S/D, AS-3S/D, and C-2S/D
 Alluvium (if present) – GWA-1S/D, GWA-2S/D/BR, GWA-3S/D, GWA-9S/D/BR, and
GWA-10S/D
 Soil/Saprolite (two locations each as stated above) – GWA-4S/D, GWA-5S/D, GWA-
6S/D, GWA-7S/D/BR, and GWA-8S/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 and Observation Wells
SHALLOW MONITORING WELLS IN REGOLITH
Groundwater quality and flow characteristics within the regolith aquifer and ash will be evaluated
through the installation, sampling, and testing of 19 shallow monitoring wells at the locations
outside of the ash basin specified on Figure 3 with an “S” qualifier in the well name (e.g., AS-
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1S). Shallow monitoring wells in regolith are defined as wells that are screened wholly within
the regolith zone or ash and set to bracket the water table surface at the time of installation.
Four additional shallow monitoring wells (GWA-20S through GWA-23S) will potentially be
installed if they are determined to be necessary based on the evaluation described in Section
7.0.
The two observation wells (OB-1 and OB-2) will be installed across the water table and will be
used for measuring water levels only (no water quality samples). The OB’s will be installed
between the ash basin and the current site background monitoring well pair MW -7SR/D. The
purpose of these OB’s is to characterize groundwater flow in the region between the ash basin
and the background monitoring wells MW -7SR/D. In addition, monitoring well GWA-7S will be
utilized as an observation well in conjunction with OB-1 and OB-2 in order to characterize
groundwater flow. Note that monitoring well GWA-7S will be installed to replace the proposed
observation well OB-3, which was included in Duke Energy’s NPDES permit renewal application
dated May 15, 2014.
Shallow monitoring and observation 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
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 5 shallow
monitoring wells at the locations specified on Figure 3 with an “S” qualifier in the well name
(e.g., AB-25S). Wells will be installed with 10-foot to15-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 4 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.
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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 26 deep monitoring wells at the
locations specified on Figure 3 with a “D” qualifier in the well name (e.g., AB-1D). Deep
monitoring wells are defined as wells that are screened within the partially weathered/fractured
bedrock transition zone at the base of the regolith. Four additional deep monitoring wells
(GWA-20D through GWA-23D) will potentially be installed if they are determined to be
necessary based on the evaluation described in Section 7.0.
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
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 seven bedrock monitoring wells at the locations
specified on Figure 3 with a “BR” qualifier in the name (e.g., GWA-7BR). Bedrock monitoring
wells are defined as wells that are screened across water-bearing fractures wholly within fresh,
competent bedrock. Four additional bedrock wells (GWA-20BR through GWA-23BR) will
potentially be installed if they are determined to be necessary based on the evaluation
described in Section 7.0.
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.
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Water source(s) to be used in rock coring and packer testing will be analyzed for all of the
constituents in Table 10 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
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 2-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.
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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 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
calculation procedures as described in Chapter 10 of their Ground Water Manual (2nd Edition)
will be used.
PACKER TESTS
A minimum of five 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 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 Groundwater
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 percent of its original pre-test level,
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whichever occurs first. Slug tests will be terminated after two hours even if the 95 percent 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.
7.1.7 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 in Section 7.1.5 prior to collecting groundwater samples.
7.1.8 Onsite Water Supply Wells
Groundwater samples will be collected from the existing onsite water supply wells 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 groundwater sample. W ater samples will be collected prior to
any filtration system (if possible) at each water supply well.
7.2 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.
 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 the ash basin.
 C-series Wells – The C-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 the ash basin.
 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).
 OB-series Wells – The OB-series wells will be used for measuring water levels only (no
water quality samples). The OB’s will be installed between the ash basin and the current
site background monitoring well pair MW -7SR/D. The purpose of these OB’s is to
characterize groundwater flow in the region between the ash basin and the background
monitoring wells MW -7SR/D. In addition, monitoring well GWA-7S will be utilized as an
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observation well in conjunction with OB-1 and OB-2 in order to characterize groundwater
flow.
 BG-series Wells – The BG-series 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 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 10. 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 or
rocks.” 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 to sample monitoring well MW -13 and the proposed background wells
BG-1S/D for total combined radium 266 and radium 228 (Ra226 and Ra228) and will consult
with the 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 (2L 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 10).
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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 redevelopment
does not result in reduced turbidity, the well(s) will be replaced. The DWR regional office will be
contacted prior to replacing a compliance monitoring well.
7.2.2 Onsite Water Supply Wells
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. The groundwater samples collected from the onsite water supply well will be analyzed
for the constituents included in Table 10.
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. Speciation of iron (Fe(II), Fe(III)) and manganese (Mn(II), Mn(IV)) will be conducted in
pore water samples collected from upper and lower elevations of ash and the transition zone
within the basin, from the ash and cinder storage areas, and in groundwater samples collected
from wells outside of the ash management areas. Specifically, Duke Energy proposes to
speciate iron and manganese in pore water samples collected from proposed wells AB-
5S/SL/D, AB-7S/SL/D, AS-2S/D, and C-2S/D, and in groundwater samples collected from
compliance wells MW -7SR, MW -8S/I/D, MW -9, MW -10, MW -11SR/DR, MW -13, MW -14, and
MW -15. Laboratory analyses will be performed in accordance with the methods provided in
Table 10.
7.3 Surface Water, Sediment, and Seep Sampling
7.3.1 Surface Water Samples
WITHIN ASH BASIN
Surface water samples will be collected from the Primary and Secondary Cells at the
approximate open water locations shown on Figure 3 (SW -AB1 and SW-AB2). 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
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provided by the laboratory. In areas where the water body is less than 5 feet deep, one water
sample will be 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 10). Select constituents will be analyzed for total and dissolved concentrations.
7.3.2 Sediment Samples
Sediment samples will be collected from the bed of the seep sample locations as shown on
Figure 3 (designated as S-1 through S-13). The S-13 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 (Table 9).
Due to safety concerns, sediment samples will not be collected at this time where open water or
ponded water is present within the ash basin.
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-13) 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 laboratory analysis for the constituents listed in
Table 10. Select constituents will be analyzed for total and dissolved concentrations.
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.
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 off-site seep samples. If it is determined that 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.
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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 -11S (5-6’). Samples
will be numbered in accordance with the proposed sample IDs shown on Figure 3.
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.
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 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 instrument 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 FDRs,
chain-of-custody records, and laboratory receipt sheets.
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:
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 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., FedEx 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
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)

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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 9 and 10, 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.
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.
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 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.
The SCM will serve as the basis for developing understanding 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
a 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.
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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.
7.7 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 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 sources (structural fill
and ash landfills), 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.
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.
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Duke Energy, HDR, and UNCC considered the appropriateness of using MODFLOW and
MT 3DMS 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 PHREEQC simulations may be used to estimate
sensitivity 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.
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.
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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 regards 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
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
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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.
Eight (8) 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 COPCs 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 MT3MS 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
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
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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
areas (if present). Note that the total digestion concentrations, if used, would be
considered an upper bound to concentrations and that the actual concentrations would
be lower than 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 f ate 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 RBSS 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 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 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 RBSS model domain is bounded approximately by the southern shore of Mountain Island
Lake to the west, north, and east, the unnamed tributary to east between Mountain Island Lake
and Horseshoe Bend Beach Road, Horseshoe Bend Beach Road to the south, and the
unnamed drainage feature between Mountain Island Lake and Horseshoe Bend Beach Road to
the west.
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 southern shore of Mountain Island Lake to the west, north, and east is considered to be a
specified head type where the head is the average annual lake stage for steady-state
simulations, or the stage observed simultaneously with groundwater level measurements at the
site. Mountain Island Lake is considered to be the ultimate discharge boundary for all
groundwater flowing through the model domain. The unnamed tributary to east between the
Mountain Island Lake and Horseshoe Bend Beach Road is considered to be a specified head
type. Horseshoe Bend Beach Road to the south is considered to be the no-flow type. The
unnamed drainage feature between Mountain Island Lake and Horseshoe Bend Beach Road to
the west is considered to be the no-flow type.
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, ash, or landfilled materials.
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
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
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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 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.

With either modeling 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 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
approach.

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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 practices, 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 Comprehensive Site Assessment (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:
Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Riverbend Steam Station Ash Basin
8.0 RISK ASSESSMENT

45
 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 groundwater data will also be compared to available background
soil and groundwater 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 groundwater or surface water
standards.
Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Riverbend Steam Station Ash Basin
8.0 RISK ASSESSMENT

46
 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 potentially 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.
Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
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8.0 RISK ASSESSMENT

47
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 the 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.
Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Riverbend Steam Station Ash Basin
8.0 RISK ASSESSMENT

48
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).
Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Riverbend Steam Station Ash Basin
9.0 CSA REPORT

49
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 | Proposed Groundwater Assessment Work Plan
Riverbend Steam Station Ash Basin
9.0 CSA REPORT

50
 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 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 waters as required.

Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Riverbend Steam Station Ash Basin
10.0 PROPOSED SCHEDULE

51

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 below.
Work Plan Schedule
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

In addition, the following permits and approvals from NCDENR will be required to commence
field work:
 If site land disturbance, equal to or greater than 1 acre, is required for access and
clearing associated with drilling work, an erosion and sedimentation control permit must
be approved by the NCDENR Division of Energy, Mineral and Land Resources, Land
Quality Section.
 Installation of monitoring wells and/or soil borings on the dams and/or dikes at the ash
basin site must be approved by the NCDENR Division of Energy, Mineral and Land
Resources, Dam Safety Section prior to drilling. Information on the location and well
construction details will be submitted as the locations are finalized.

Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Riverbend Steam Station Ash Basin
11.0 REFERENCES

52

11.0 References
1. ARCADIS G&M of North Carolina, Inc., 2007. Ash Basin Drilling Services for: Riverbend
Steam Station, Mount Holly, North Carolina.
2. Cunningham, W. L. and Daniels, C. C, III, 2001. Investigation of ground-water availability
and quality in Orange County, North Carolina: U. S. Geological Survey, Water-Resources
Investigations Report 00-4286, 59 p.
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 for Ash Management, Geo-Congress 2014 Technical Papers: Geo-
characterization and Modeling for Sustainability. Wentworth Institute of Technology,
Boston, MA.
5. 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, 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.
7. EPRI, 2009. Electric Power Research Institute, Technical Update – Coal Combustion
Products – Environmental Issues – Coal Ash: Characteristics, Management and
Environmental Issues, EPRI 1019022. September 2009.
8. EPRI, 2014. Electric Power Research Institute, Assessment of Radioactive Elements in
Coal Combustion Products, 2014 Technical Report 3002003774, Final Report August
2014.
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 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
Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Riverbend Steam Station Ash Basin
11.0 REFERENCES

53
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, 2013. “Groundwater Assessment, Duke Energy Carolinas, LLC, Riverbend Steam
Station Ash Basin, NPDES Permit NC0004961.”
14. HDR, 2014A. “Riverbend Steam Station Ash Basin Drinking Water Supply Well and
Receptor Survey, NPDES Permit NC0004961.”
15. HDR, 2014B. “Riverbend Steam Station Ash Basin Supplement to Drinking Water Supply
Well and Receptor Survey.”
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. O-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. MACTEC, 2011. Amended Ash Basin Monitoring Well Installation Report, Riverbend
Steam Station, MACTEC Project No. 6228-10-5284.
23. NCDENR, 2003. Division of Waste Management - Guidelines for Performing Screening
Level Ecological Risk Assessments within North Carolina.
24. NCDENR Memorandum “Performance and Analysis of Aquifer Slug Tests and Pumping
Tests Policy,” May 31, 2007.
25. NCDENR document, “Hydrogeologic Investigation and Reporting Policy Memorandum,”
dated May 31, 2007.
Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
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11.0 REFERENCES

54
26. NCDENR DWQ NCDENR Division of Water Quality, “Evaluating Metals in Groundwater at
DWQ Permitted Facilities: A Technical Assistance Document for DWQ Staff”, July 2013.
27. 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.
28. 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.
29. USEPA, 1987. Batch-type procedures for estimating soil adsorption of chemicals
Technical Resource Document 530/SW-87/006-F.
30. USEPA, 1997. Ecological Risk Assessment Guidance for Superfund: Process for
Designing and Conducting Ecological Risk Assessments
31. USEPA, 2001. Region 4 Ecological Risk Assessment Bulletins—Supplement to RAGS.
32. USEPA, 1998. Guidelines for Ecological Risk Assessment.
33. US FWS, 2009. Range-wide Indiana Bat Protection and Enhancement Plan Guidelines, at
http://www.fws.gov/frankfort/pdf/inbatpepguidelines.pdf.
34. 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
35. 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.
36. 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.
37. USEPA, 1998. Report to Congress Wastes from the Combustion of Fossil Fuels, Volume 2
Methods, Findings, and Recommendations

.

Figures

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yr
ell
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48
NOTES: ti r 6
I. SOURCES: USGS TOPOGRAPHIC MAP - MT. ISLAND LAKE,
CREATED 1993. USGS TOPOGRAPHIC MAP - LAKE NORMAN �l s„
SOUTH, CREATED 1993.
SCALE (FEET)
1000 0 1000 2000
SITE LOCATION MAP
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION
NPDES PERMIT NO. NC0004961
GASTON COUNTY, NORTH CAROLINA
DATE
DEC. 30, 2014
FIGURE

MW-35`
•.n4
OG `
eel
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NOTES:
1. PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE.
2. ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE.
3. AS -BUILT MONITORING WELL LOCATIONS PROVIDED BY DUKE ENERGY.
4. SHALLOW MONITORING WELLS (S) - WELL SCREEN INSTALLED ACROSS THE SURFICIAL WATER TABLE.
S. DEEP MONITORING WELLS (D) - WELL SCREEN INSTALLED IN THE TRANSITION ZONE BETWEEN COMPETENT BEDROCKAND THE REGOLITH.
6. TOPOGRAPHY DATA FOR THE SITE WAS OBTAINED FROM NC DOT GEOGRAPHIC INFORMATION SYSTEM (GIS) WEB SITE.
7. ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014).
8. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 1SA NCAC 02L.0307 (a).
SCALE (FEET)
400, 0 400' 800,
LEGEND:
♦
DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY COINCIDENT
WITH DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH OR CINDER STORAGE AREA BOUNDARY
STREAM
TOPOGRAPHIC CONTOUR (4 FOOT)
EXISTING ASH BASIN COMPLIANCE GROUNDWATER
MONITORING WELL LOCATION
EXISTING ASH BASIN VOLUNTARY GROUNDWATER
MONITORING WELL LOCATION
EXISTING WATER SUPPLY WELL
SITE LAYOUT MAP
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION
NPDES PERMIT NO. NC0004961
CASTON COUNTY, NORTH CAROLINA
DATE
DEC. 30, 2014
FIGURE
2

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NOTES:
1. PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE.
2. ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE.
3. AS -BUILT MONITORING WELL LOCATIONS PROVIDED BY DUKE ENERGY.
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 WAS OBTAINED FROM NC DOT GEOGRAPHIC INFORMATION SYSTEM (GIS) WEB SITE.
7. ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014).
8. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L .0107 (a).
9. PROPOSED WELL LOCATIONS ARE APPROXIMATE AND MAY BE ADJUSTED DUE TO FIELD CONDITIONS.
10. SEEP SAMPLING LOCATIONS WERE OBTAINED BY HDR USING A TRIMBLE HANDHELD GPS UNIT ON APRIL 29, 2014.
* INDICATES SEEP SAMPLING LOCATIONS WERE NOT RECORDED WITH GPS UNIT AND ARE APPROXIMATE.
14
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41
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r
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_F a
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r
PROPOSED WELL AND SAMPLE LOCATIONS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION
NPDES PERMIT NO. NC0004961
GASTO N COUNTY, NORTH CAROLINA
LEGEND:
DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY COINCIDENT
WITH DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH OR CINDER STORAGE AREA BOUNDARY
STREAM
TOPOGRAPHIC CONTOUR 4 FOOT
EXISTING ASH BASIN COMPLIANCE GROUNDWATER
MONITORING WELL
EXISTING ASH BASIN VOLUNTARY GROUNDWATER
MONITORING WELL
PROPOSED GROUNDWATER MONITORING WELL LOCATION
PROPOSED OBSERVATION WELL LOCATION
PROPOSED ADDITIONAL BORING/GROUNDWATER
MONITORING WELL LOCATION
PROPOSED SURFACE WATER SAMPLE LOCATION
PROPOSED SEEP AND SEDIMENT SAMPLE LOCATION
DATE
DEC. 30, 2014
FIGURE
3

Tables

Table 1. Groundwater Monitoring Requirements
Well Nomenclature Constituents and Parameters Frequency
Monitoring Wells: MW-7SR,
MW-7D, MW-8S, MW-8I, MW-8D,
MW-8D, *MW-9, *MW-10,
MW-11SR, MW-11DR, *MW-13,
MW-14, MW-15
Antimony Chromium Nickel Thallium
March, July,
November
Arsenic Copper Nitrate Water Level
Barium Iron pH Zinc
Boron Lead Selenium
Cadmium Manganese Sulfate
Chloride Mercury TDS
Note: Monitoring wells marked with * are located inside of the compliance boundary.
Tables - Page 1

TABLE 2 - EXCEEDANCES OF 2L STANDARDS DECEMBER 2010 – OCTOBER 2014

Parameter Iron Manganese pH Antimony
Units µg/L µg/L SU µg/L
2L Standard 300 50 6.5 - 8.5 1**
Well ID Range of Exceedances
MW-7SR 445 – 790 67 – 413 5.0 – 5.4 No Exceedances
MW-7D No Exceedances No Exceedances 5.5 – 5.8 1.04
MW-8S No Exceedances 64 – 144 4.3 – 5.2 No Exceedances
MW-8I 436 – 2,460 52 – 290 5.7 – 6.4 No Exceedances
MW-8D 777 – 4,160 82 – 671 6.3– 6.5 No Exceedances
MW-9* 341 – 1,950 62 – 147 5.8 – 6.4 No Exceedances
MW-10* 310 – 1,420 67 – 355 4.8 – 5.4 No Exceedances
MW-11SR 486 59 - 384 5.6 – 6.1 No Exceedances
MW-11DR No Exceedances 51 – 168 5.6 - 5.8 No Exceedances
MW-13* 7,690– 37,700 8,070 – 11,200 5.8 – 6.4 No Exceedances
MW-14 371 – 935 55 – 353 No Exceedances No Exceedances
MW-15 399 - 465 52 – 86 5.1 – 5.3 No Exceedances
Notes: Monitoring wells marked with * are located inside of the compliance boundary.
** Antimony concentration is an Interim Maximum Allowable Concentration (IMAC).

Tables - Page 2
Table 3 - SPLP Leaching Analytical Results
pH Aluminum Antimony Arsenic Barium Beryllium Boron Cadmium Calcium Chloride Chromium Cobalt Copper Fluoride Iron Lead
SU mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L
6.5 - 8.5 NE 0.001*0.01 0.7 0.004*0.7 0.002 NE 250 0.01 0.001*1 2 0.3 0.015
Analytical Method 200.8 200.8 200.7 200.7 200.8 200.7 200.7 200.8 200.7 200.7 200.8
Site Name Protocol Sample Collection Date
Ponded TCLP 1/1/1997 7.5 N/A N/A 0.098 1.3 N/A N/A <0.01 N/A N/A <0.02 N/A N/A N/A N/A <0.09
Ponded TCLP 1/1/1999 0 N/A N/A <0.1 0.96 N/A N/A <0.03 N/A N/A <0.04 N/A N/A N/A N/A <0.09
Ponded TCLP 1/1/2000 6.5 N/A N/A 0.14 2.5 N/A N/A <0.03 N/A N/A <0.04 N/A N/A N/A N/A <0.09
Ponded SPLP 1/1/2003 5.97 N/A N/A 0.054 0.1 N/A 0.178 <0.001 12.172 <1 0.001 N/A <0.002 <1 <0.01 <0.002
Ponded SPLP 12/12/2006 7.56 N/A 0.008 0.21 0.089 N/A 0.26 <0.069 11 0.42 0.004 N/A <0.014 0.26 N/A <0.34
Reuse Comp TCLP 10/14/2010 6.5 N/A N/A <0.1 0.679 N/A N/A <0.01 N/A N/A <0.05 N/A N/A N/A N/A <0.05
Analytical Parameter
Units
15A NCAC 02L .0202(g) Groundwater Quality Standard
Tables - Page 3
Table 3 - SPLP Leaching Analytical Results
Analytical Method
Site Name Protocol Sample Collection Date
Ponded TCLP 1/1/1997
Ponded TCLP 1/1/1999
Ponded TCLP 1/1/2000
Ponded SPLP 1/1/2003
Ponded SPLP 12/12/2006
Reuse Comp TCLP 10/14/2010
Analytical Parameter
Units
15A NCAC 02L .0202(g) Groundwater Quality Standard
Magnesium Manganese Mercury Molybdenum Nickel Nitrate as N Phosphorus Potassium Selenium Silver Sodium Strontium Sulfate Thallium Zinc
mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L
NE 0.05 0.001 NE 0.1 10 NE NE 0.02 20 NE NE 250 0.0002*1
200.7 200.8 245.1 200.8 200.7 200.7 200.8 200.7 200.8 200.7
N/A N/A <0.01 N/A N/A N/A N/A N/A <0.06 0.1 N/A N/A N/A N/A N/A
N/A N/A <0.01 N/A N/A N/A N/A N/A <0.13 <0.005 N/A N/A N/A N/A N/A
N/A N/A <0.01 N/A N/A N/A N/A N/A <0.13 <0.005 N/A N/A N/A N/A N/A
1.414 0.001 <0.001 N/A <0.002 <1 0.188 2.6 <0.004 <0.0005 N/A N/A 35.92 N/A 0.009
2 <0.0069 <0.014 N/A 0.001 0.71 0.74 0.7 0.015 <0.34 N/A N/A 16 N/A 0.007
N/A N/A <0.01 N/A N/A N/A N/A N/A <0.1 <0.05 N/A N/A N/A N/A N/A
Tables - Page 4
Table 3 - SPLP Leaching Analytical Results
Notes:
1.TDS = Total dissolved solids
SPLP = Synthetic Precipitation Leaching Procedure
TCLP = Toxicity Characteristic Leaching Procedure
2.Units:
mg/L = milligrams per liter
µg/L = micrograms per liter
3.* IMAC (interim maximum allowable concentration)
4.Highlighted values indicate values that exceed the 15A NCAC 2L 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
Tables - Page 5
Table 4 - Groundwater Analytical Results
Depth to
Water Temp.DO Cond.pH ORP Turbidity Aluminum Beryllium
Feet ˚C mg/L µmhos/cm SU mV NTU mg/L CaCO3 mg/L HCO3-mg/L CO32-µg/L µg/L
NE NE NE NE 6.5 - 8.5 NE NE NE NE NE NE 4*
Analytical Method 2320B4d N/A N/A 0 N/A
Well Name Well Type Hydrostratigraphic Unit Sample Collection Date Total Dissolved Total Dissolved Total Dissolved Total Total
MW-10 Compliance Residuum 12/6/2010 10.21 15.2 N/A 71.4 5.57 N/A 182 N/A N/A N/A N/A N/A <1 N/A <1 N/A 71 N/A
MW-10 Compliance Residuum 2/1/2011 9.77 14.1 N/A 84.7 5.4 N/A 84.1 N/A N/A N/A N/A N/A <1 N/A <1 N/A 63 N/A
MW-10 Compliance Residuum 6/7/2011 10.26 15.93 N/A 79.4 5.3 N/A 6.92 N/A N/A N/A N/A N/A <1 N/A <1 N/A 41 N/A
MW-10 Compliance Residuum 10/3/2011 9.87 16.81 N/A 133.6 5.36 N/A 29.7 N/A N/A N/A N/A N/A <1 N/A <1 N/A 73 N/A
MW-10 Compliance Residuum 2/6/2012 9.34 14.67 1.52 65 5.3 408 10.7 N/A N/A N/A N/A N/A <1 N/A <1 N/A 44 N/A
MW-10 Compliance Residuum 6/4/2012 9.95 15.53 1.01 68 5.26 401 3.19 N/A N/A N/A N/A N/A <1 N/A <1 N/A 41 N/A
MW-10 Compliance Residuum 10/3/2012 10.03 17.87 0.88 124 5.41 243 8.19 N/A N/A N/A N/A N/A <1 N/A <1 N/A 76 N/A
MW-10 Compliance Residuum 2/4/2013 9.52 14.88 2.08 86 5.29 388 5.23 6.8 N/A N/A N/A <1 <1 <1 <1 46 51 N/A
MW-10 Compliance Residuum 6/4/2013 9.86 14.84 1.39 65 4.8 444 7.73 5.2 N/A N/A N/A N/A <1 N/A <1 N/A 42 N/A
MW-10 Compliance Residuum 10/15/2013 10.54 17.37 0.28 123 5.28 311 6.95 6.8 N/A N/A N/A N/A <1 N/A <1 N/A 77 N/A
MW-10 Compliance Residuum 2/3/2014 9.62 15.35 1.77 78 5.22 375 5.81 5.3 N/A N/A N/A <1 <1 <1 <1 48 49 N/A
MW-10 Compliance Residuum 6/2/2014 10.12 14.99 0.96 79 5.24 470 21.7 <5 N/A N/A N/A N/A <1 N/A <1 N/A 48 N/A
MW-11DR Compliance Bedrock 2/1/2011 24.56 16.71 N/A 153.9 5.83 N/A 2.6 N/A N/A N/A N/A N/A <1 N/A <1 N/A 75 N/A
MW-11DR Compliance Bedrock 6/6/2011 24.72 19.39 N/A 154.6 5.63 N/A 0.68 N/A N/A N/A N/A N/A <1 N/A <1 N/A 78 N/A
MW-11DR Compliance Bedrock 10/3/2011 24.71 17.14 N/A 155.4 5.55 N/A 3.4 N/A N/A N/A N/A N/A <1 N/A <1 N/A 79 N/A
MW-11DR Compliance Bedrock 2/6/2012 24.17 17.16 0.78 148 5.67 262 0.64 N/A N/A N/A N/A N/A <1 N/A <1 N/A 77 N/A
MW-11DR Compliance Bedrock 6/4/2012 24.58 17.78 0.72 153 5.66 239 0.18 N/A N/A N/A N/A N/A <1 N/A <1 N/A 78 N/A
MW-11DR Compliance Bedrock 10/3/2012 24.67 18.28 0.51 154 5.75 151 0.94 N/A N/A N/A N/A N/A <1 N/A <1 N/A 76 N/A
MW-11DR Compliance Bedrock 2/4/2013 24.22 17.31 0.95 153 5.67 232 1.24 14 N/A N/A N/A <1 <1 <1 <1 76 75 N/A
MW-11DR Compliance Bedrock 6/3/2013 24.26 17.83 0.65 152 5.64 239 2.24 14 N/A N/A N/A N/A <1 N/A <1 N/A 81 N/A
MW-11DR Compliance Bedrock 10/14/2013 25.46 18.11 0.79 151 5.76 198 2.24 14 N/A N/A N/A N/A <1 N/A <1 N/A 72 N/A
MW-11DR Compliance Bedrock 2/3/2014 24.41 18.06 1.12 149 5.65 262 1.94 14 N/A N/A N/A <1 <1 <1 <1 72 71 N/A
MW-11DR Compliance Bedrock 6/2/2014 24.69 17.85 0.95 149 5.71 431 1.55 12 N/A N/A N/A N/A <1 N/A <1 N/A 69 N/A
MW-11SR Compliance Residuum 2/1/2011 24.7 16.56 N/A 167.7 6.07 N/A 11 N/A N/A N/A N/A N/A <1 N/A <1 N/A 32 N/A
MW-11SR Compliance Residuum 6/6/2011 24.87 19.7 N/A 162.7 5.79 N/A 3.44 N/A N/A N/A N/A N/A <1 N/A <1 N/A 31 N/A
MW-11SR Compliance Residuum 10/3/2011 24.86 17.06 N/A 161.8 5.59 N/A 6.13 N/A N/A N/A N/A N/A <1 N/A <1 N/A 29 N/A
MW-11SR Compliance Residuum 2/6/2012 24.3 17.19 0.43 153 5.72 96 2.72 N/A N/A N/A N/A N/A <1 N/A <1 N/A 26 N/A
MW-11SR Compliance Residuum 6/4/2012 24.73 17.66 0.53 156 5.72 122 2.35 N/A N/A N/A N/A N/A <1 N/A <1 N/A 26 N/A
MW-11SR Compliance Residuum 10/3/2012 24.83 18.27 0.45 158 5.78 82 1.37 N/A N/A N/A N/A N/A <1 N/A <1 N/A 25 N/A
MW-11SR Compliance Residuum 2/4/2013 24.35 17.44 0.53 156 5.72 118 2.05 15 N/A N/A N/A <1 <1 <1 <1 25 25 N/A
MW-11SR Compliance Residuum 6/3/2013 24.43 18.05 0.59 155 5.67 171 3.53 14 N/A N/A N/A N/A <1 N/A <1 N/A 26 N/A
MW-11SR Compliance Residuum 10/14/2013 25.59 18.13 0.6 152 5.77 155 5.07 15 N/A N/A N/A N/A <1 N/A <1 N/A 26 N/A
MW-11SR Compliance Residuum 2/3/2014 24.54 17.83 0.65 150 5.68 138 2.55 14 N/A N/A N/A <1 <1 <1 <1 24 25 N/A
MW-11SR Compliance Residuum 6/2/2014 24.84 19.01 0.75 151 5.73 242 3.34 13 N/A N/A N/A N/A <1 N/A <1 N/A 26 N/A
MW-12 Compliance Residuum 12/6/2010 11.37 15.84 N/A 144.6 5.89 N/A 11.5 N/A N/A N/A N/A N/A <1 N/A <1 N/A 41 N/A
MW-12 Compliance Residuum 2/1/2011 11.15 15.88 N/A 141.9 5.89 N/A 11.7 N/A N/A N/A N/A N/A <1 N/A <1 N/A 41 N/A
MW-13 Compliance Residuum 12/6/2010 10.42 16.42 N/A 198.2 6.27 N/A 5.26 N/A N/A N/A N/A N/A <1 N/A <1 N/A 260 N/A
MW-13 Compliance Residuum 2/1/2011 10.11 14.75 N/A 296.9 6.35 N/A 3.26 N/A N/A N/A N/A N/A <1 N/A <1 N/A 250 N/A
MW-13 Compliance Residuum 6/7/2011 10.77 16.48 N/A 203 6.22 N/A 6.4 N/A N/A N/A N/A N/A <1 N/A <1 N/A 232 N/A
MW-13 Compliance Residuum 10/4/2011 10.36 17.55 N/A 213.6 6.29 N/A 7.67 N/A N/A N/A N/A N/A <1 N/A <1 N/A 295 N/A
MW-13 Compliance Residuum 2/6/2012 9.67 15.15 0.56 205 5.99 138 3.14 N/A N/A N/A N/A N/A <1 N/A <1 N/A 203 N/A
MW-13 Compliance Residuum 6/5/2012 10.34 16.01 0.06 202 6.18 139 3.15 N/A N/A N/A N/A N/A <1 N/A <1 N/A 219 N/A
MW-13 Compliance Residuum 10/3/2012 10.23 18.46 0.59 218 6.28 100 2.4 N/A N/A N/A N/A N/A <1 N/A <1 N/A 305 N/A
MW-13 Compliance Residuum 2/5/2013 9.91 15.36 0.19 212 6.13 178 3.75 81 N/A N/A N/A <1 <1 <1 <1 289 289 N/A
MW-13 Compliance Residuum 6/3/2013 9.58 15.83 0.11 185 5.97 234 9.32 69 N/A N/A N/A N/A <1 N/A <1 N/A 264 N/A
MW-13 Compliance Residuum 10/15/2013 10.93 17.79 0.83 145 5.8 273 18.8 51 N/A N/A N/A N/A <1 N/A <1 N/A 177 N/A
MW-13 Compliance Residuum 2/3/2014 9.88 15.86 0.22 313 5.97 99 18.3 67 N/A N/A N/A <1 <1 <1 <1 321 319 N/A
MW-13 Compliance Residuum 6/2/2014 10.47 14.65 0.2 215 6.17 153 4.67 40 N/A N/A N/A N/A <1 N/A <1 N/A 275 N/A
MW-14 Compliance Residuum 12/6/2010 7.42 15.13 N/A 175.3 6.86 N/A 25.6 N/A N/A N/A N/A N/A <1 N/A <1 N/A 10 N/A
MW-14 Compliance Residuum 2/1/2011 7.19 14.23 N/A 194.1 6.95 N/A 14.4 N/A N/A N/A N/A N/A <1 N/A <1 N/A 10 N/A
MW-14 Compliance Residuum 6/7/2011 7.79 17.22 N/A 215.8 6.79 N/A 6.09 N/A N/A N/A N/A N/A <1 N/A <1 N/A 10 N/A
MW-14 Compliance Residuum 10/4/2011 7.47 17.18 N/A 196.1 6.8 N/A 12.9 N/A N/A N/A N/A N/A <1 N/A <1 N/A 9 N/A
MW-14 Compliance Residuum 2/6/2012 6.81 15.12 0.98 203 6.81 225 4.31 N/A N/A N/A N/A N/A <1 N/A <1 N/A 15 N/A
MW-14 Compliance Residuum 6/5/2012 7.63 15.69 0.42 199 6.71 262 1.85 N/A N/A N/A N/A N/A <1 N/A <1 N/A 12 N/A
MW-14 Compliance Residuum 10/3/2012 7.42 17.94 0.52 197 6.73 209 2.04 N/A N/A N/A N/A N/A <1 N/A <1 N/A 11 N/A
MW-14 Compliance Residuum 2/4/2013 7.05 15.34 1.85 214 6.79 230 3.92 56 N/A N/A N/A <1 <1 <1 <1 9 10 N/A
MW-14 Compliance Residuum 6/3/2013 7.73 16.07 0.52 205 6.85 310 3.24 66 N/A N/A N/A N/A <1 N/A <1 N/A 11 N/A
MW-14 Compliance Residuum 10/15/2013 8.28 17.68 0.33 202 6.63 319 5.48 66 N/A N/A N/A N/A <1 N/A <1 N/A 11 N/A
MW-14 Compliance Residuum 2/3/2014 7.07 14.64 0.79 214 6.74 349 8.64 67 N/A N/A N/A <1 <1 <1 <1 10 12 N/A
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
Analytical Parameter Alkalinity Antimony Arsenic Barium
1*10 700
Field Measurements
200.8 200.8 200.7
Total
µg/L µg/L µg/L
Tables - Page 6
Table 4 - Groundwater Analytical Results
Depth to
Water Temp.DO Cond.pH ORP Turbidity Aluminum Beryllium
Feet ˚C mg/L µmhos/cm SU mV NTU mg/L CaCO3 mg/L HCO3-mg/L CO32-µg/L µg/L
NE NE NE NE 6.5 - 8.5 NE NE NE NE NE NE 4*
Analytical Method 2320B4d N/A N/A 0 N/A
Well Name Well Type Hydrostratigraphic Unit Sample Collection Date Total Dissolved Total Dissolved Total Dissolved Total Total
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
Analytical Parameter Alkalinity Antimony Arsenic Barium
1*10 700
Field Measurements
200.8 200.8 200.7
Total
µg/L µg/L µg/L
MW-14 Compliance Residuum 6/2/2014 7.78 14.83 0.49 199 6.73 298 8.21 44 N/A N/A N/A N/A <1 N/A <1 N/A 11 N/A
MW-15 Compliance Residuum 2/23/2011 12.49 15.48 2.21 109.5 5.29 424 13.2 N/A N/A N/A N/A N/A <1 N/A <1 N/A 71 N/A
MW-15 Compliance Residuum 6/6/2011 13.15 17.15 N/A 106.7 5.21 N/A 10.8 N/A N/A N/A N/A N/A <1 N/A <1 N/A 86 N/A
MW-15 Compliance Residuum 10/3/2011 12.68 16.94 N/A 106.2 5.16 N/A 10.9 N/A N/A N/A N/A N/A <1 N/A <1 N/A 81 N/A
MW-15 Compliance Residuum 2/6/2012 12.37 15.63 2.12 96 5.19 360 7.99 N/A N/A N/A N/A N/A <1 N/A <1 N/A 76 N/A
MW-15 Compliance Residuum 6/5/2012 12.86 15.93 0.91 103 5.07 422 2.73 N/A N/A N/A N/A N/A <1 N/A <1 N/A 78 N/A
MW-15 Compliance Residuum 10/3/2012 12.94 18.02 2.37 102 5.24 383 4.16 N/A N/A N/A N/A N/A <1 N/A <1 N/A 76 N/A
MW-15 Compliance Residuum 2/4/2013 12.42 16.25 1.39 100 5.2 330 3.35 5.3 N/A N/A N/A <1 <1 <1 <1 74 75 N/A
MW-15 Compliance Residuum 6/3/2013 12.88 16.11 0.67 102 5.1 418 1.5 4.6 N/A N/A N/A N/A <1 N/A <1 N/A 80 N/A
MW-15 Compliance Residuum 10/14/2013 13.42 17.66 0.83 103 5.19 207 3.83 4.2 N/A N/A N/A N/A <1 N/A <1 N/A 80 N/A
MW-15 Compliance Residuum 2/3/2014 12.56 16.89 1.69 99 5.06 386 2.15 3.5 N/A N/A N/A <1 <1 <1 <1 79 79 N/A
MW-15 Compliance Residuum 6/2/2014 12.94 15.18 0.98 101 5.05 433 6.02 <5 N/A N/A N/A N/A <1 N/A <1 N/A 83 N/A
MW-1D Voluntary Not Reported 12/16/2008 N/A 17.81 N/A 269 6.16 N/A 3.1 21 N/A N/A N/A N/A N/A N/A <2 N/A 33 N/A
MW-1D Voluntary Not Reported 6/22/2009 N/A 19.51 N/A 275 5.93 N/A 2.25 19 N/A N/A N/A N/A N/A N/A <1 N/A 31 N/A
MW-1D Voluntary Not Reported 12/14/2009 N/A 17.46 N/A 286 6.16 N/A 1.27 21 N/A N/A N/A N/A N/A N/A <1 N/A 32.9 N/A
MW-1D Voluntary Not Reported 6/28/2010 1.97 19.98 N/A 279 5.89 N/A 1.31 20 N/A N/A N/A N/A N/A N/A <1 N/A 31.7 N/A
MW-1S Voluntary Not Reported 12/16/2008 N/A 18.3 N/A 172 6.88 N/A 49.3 28 N/A N/A N/A N/A N/A N/A <2 N/A 25 N/A
MW-1S Voluntary Not Reported 6/22/2009 N/A 17.47 N/A 167 6.53 N/A 19.3 20 N/A N/A N/A N/A N/A N/A <1 N/A 20 N/A
MW-1S Voluntary Not Reported 12/14/2009 N/A 18.14 N/A 173 6.99 N/A 9.59 27 N/A N/A N/A N/A N/A N/A <1 N/A 22.3 N/A
MW-1S Voluntary Not Reported 6/28/2010 0.1 19.16 N/A 169 6.47 N/A 6.91 54 N/A N/A N/A N/A N/A N/A <1 N/A 21 N/A
MW-1S Voluntary Not Reported 12/6/2010 -0.98 N/A N/A N/A N/A N/A 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-1S Voluntary Not Reported 2/1/2011 0.05 N/A N/A N/A N/A N/A 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-1S Voluntary Not Reported 6/7/2011 0.13 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 N/A N/A
MW-2D Voluntary Not Reported 12/16/2008 N/A 17.3 N/A 73 6.46 N/A 34.5 37 N/A N/A N/A N/A N/A N/A <2 N/A 29 N/A
MW-2D Voluntary Not Reported 6/22/2009 N/A 18.21 N/A 90 6.48 N/A 24.2 38 N/A N/A N/A N/A N/A N/A <1 N/A 26 N/A
MW-2D Voluntary Not Reported 12/14/2009 N/A 16.55 N/A 123 6.53 N/A 16.9 38 N/A N/A N/A N/A N/A N/A <1 N/A 25.7 N/A
MW-2D Voluntary Not Reported 6/28/2010 19.49 18.91 N/A 95 6.42 N/A 2.24 41 N/A N/A N/A N/A N/A N/A <1 N/A 22.8 N/A
MW-2S Voluntary Not Reported 12/16/2008 N/A 20.87 N/A 152.3 4.59 N/A 6.06 <5 N/A N/A N/A N/A N/A N/A <2 N/A 69 N/A
MW-2S Voluntary Not Reported 6/22/2009 N/A 18.01 N/A 142 4.44 N/A 5.65 <5 N/A N/A N/A N/A N/A N/A <1 N/A 51 N/A
MW-2S Voluntary Not Reported 12/14/2009 N/A 19.25 N/A 168 4.45 N/A 5.53 <5 N/A N/A N/A N/A N/A N/A <1 N/A 64.1 N/A
MW-2S Voluntary Not Reported 6/28/2010 19.72 17.71 N/A 149 4.36 N/A 2.56 <5 N/A N/A N/A N/A N/A N/A <1 N/A 57.3 N/A
MW-2S Voluntary Not Reported 12/6/2010 20.09 N/A N/A N/A N/A N/A 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-2S Voluntary Not Reported 2/1/2011 20.52 N/A N/A N/A N/A N/A 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-2S Voluntary Not Reported 6/7/2011 20.25 N/A N/A N/A N/A N/A 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-2S Voluntary Not Reported 10/3/2011 19.65 N/A N/A N/A N/A N/A 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-3D Voluntary Not Reported 12/16/2008 N/A 14.07 N/A 179.5 6.98 N/A 1.52 57 N/A N/A N/A N/A N/A N/A <2 N/A 8 N/A
MW-3D Voluntary Not Reported 6/22/2009 N/A 14.6 N/A 185.3 6.73 N/A 0.22 55 N/A N/A N/A N/A N/A N/A <1 N/A 8 N/A
MW-3D Voluntary Not Reported 12/14/2009 N/A 13.78 N/A 184.6 6.79 N/A 2.66 56 N/A N/A N/A N/A N/A N/A <1 N/A <5 N/A
MW-3D Voluntary Not Reported 6/28/2010 0.96 15.79 N/A 186.5 6.84 N/A 5.15 53 N/A N/A N/A N/A N/A N/A <1 N/A 8.09 N/A
MW-3S Voluntary Not Reported 12/16/2008 N/A 15.03 N/A 189.3 6.49 N/A 29.7 49 N/A N/A N/A N/A N/A N/A <2 N/A 42 N/A
MW-3S Voluntary Not Reported 6/22/2009 N/A 15.13 N/A 196.6 6.31 N/A 13.2 52 N/A N/A N/A N/A N/A N/A <1 N/A 37 N/A
MW-3S Voluntary Not Reported 12/14/2009 N/A 14.64 N/A 195.4 6.24 N/A 56.8 54 N/A N/A N/A N/A N/A N/A <1 N/A 42.3 N/A
MW-3S Voluntary Not Reported 6/28/2010 9.69 17.51 N/A 191.3 6.26 N/A 21.3 50 N/A N/A N/A N/A N/A N/A <1 N/A 42.4 N/A
MW-3S Voluntary Not Reported 12/6/2010 9.48 N/A N/A N/A N/A N/A 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-3S Voluntary Not Reported 2/1/2011 9.23 N/A N/A N/A N/A N/A 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-3S Voluntary Not Reported 6/7/2011 9.72 N/A N/A N/A N/A N/A 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-3S Voluntary Not Reported 10/4/2011 9.48 N/A N/A N/A N/A N/A 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-4D Voluntary Not Reported 12/16/2008 N/A 13.98 N/A 133.1 5.92 N/A 137 18 N/A N/A N/A N/A N/A N/A <2 N/A 91 N/A
MW-4D Voluntary Not Reported 6/22/2009 N/A 14.45 N/A 138.4 5.86 N/A 60 17 N/A N/A N/A N/A N/A N/A <1 N/A 79 N/A
MW-4D Voluntary Not Reported 12/14/2009 N/A 13.39 N/A 135.6 5.79 N/A 89.5 19 N/A N/A N/A N/A N/A N/A <1 N/A 82.5 N/A
MW-4D Voluntary Not Reported 6/28/2010 20.35 15.48 N/A 136.1 5.86 N/A 86.1 17 N/A N/A N/A N/A N/A N/A <1 N/A 94.8 N/A
MW-4D Voluntary Not Reported 2/5/2013 20.12 13.01 0.11 131 5.62 347 43.6 18 N/A N/A N/A <1 <1 <1 <1 60 74 N/A
MW-4D Voluntary Not Reported 10/15/2013 20.88 13.99 12.54 136 5.97 379 12.9 20 N/A N/A N/A N/A <1 N/A <1 N/A 68 N/A
MW-4D Voluntary Not Reported 2/4/2014 20.12 13.57 1.72 135 5.74 479 19.1 19 N/A N/A N/A <1 <1 <1 <1 65 72 N/A
MW-4D Voluntary Not Reported 6/3/2014 20.47 14.1 1.31 135 5.57 399 47 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
MW-4S Voluntary Not Reported 12/16/2008 N/A 14.61 N/A 116.3 5.49 N/A 135 10 N/A N/A N/A N/A N/A N/A <2 N/A 17 N/A
MW-4S Voluntary Not Reported 6/22/2009 N/A 14.43 N/A 111.8 5.38 N/A 41.5 9.3 N/A N/A N/A N/A N/A N/A <1 N/A 16 N/A
MW-4S Voluntary Not Reported 12/14/2009 N/A 13.74 N/A 112.3 5.35 N/A 119 11 N/A N/A N/A N/A N/A N/A <1 N/A 22 N/A
MW-4S Voluntary Not Reported 6/28/2010 18.83 17.49 N/A 113.6 5.51 N/A 22 9.6 N/A N/A N/A N/A N/A N/A <1 N/A 21.7 N/A
Tables - Page 7
Table 4 - Groundwater Analytical Results
Depth to
Water Temp.DO Cond.pH ORP Turbidity Aluminum Beryllium
Feet ˚C mg/L µmhos/cm SU mV NTU mg/L CaCO3 mg/L HCO3-mg/L CO32-µg/L µg/L
NE NE NE NE 6.5 - 8.5 NE NE NE NE NE NE 4*
Analytical Method 2320B4d N/A N/A 0 N/A
Well Name Well Type Hydrostratigraphic Unit Sample Collection Date Total Dissolved Total Dissolved Total Dissolved Total Total
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
Analytical Parameter Alkalinity Antimony Arsenic Barium
1*10 700
Field Measurements
200.8 200.8 200.7
Total
µg/L µg/L µg/L
MW-4S Voluntary Not Reported 12/6/2010 19.08 N/A N/A N/A N/A N/A 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-4S Voluntary Not Reported 2/1/2011 18.84 N/A N/A N/A N/A N/A 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-4S Voluntary Not Reported 6/7/2011 19.08 N/A N/A N/A N/A N/A 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-4S Voluntary Not Reported 10/4/2011 18.87 N/A N/A N/A N/A N/A 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-4S Voluntary Not Reported 2/5/2013 18.37 11.13 7.86 160 5.35 365 0 14 N/A N/A N/A 1.65 <5 <1 <5 17 262 N/A
MW-4S Voluntary Not Reported 10/15/2013 19.33 14.99 0.04 120 5.43 372 2.38 13 N/A N/A N/A N/A <1 N/A <1 N/A 28 N/A
MW-4S Voluntary Not Reported 2/4/2014 18.56 12.59 0.2 116 5.44 371 5.03 12 N/A N/A N/A <1 <1 <1 <1 24 26 N/A
MW-4S Voluntary Not Reported 6/3/2014 18.97 14.84 1.85 115 5.33 412 11.3 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
MW-5D Voluntary Not Reported 12/16/2008 N/A 15.32 N/A 278.1 6.83 N/A 0.74 80 N/A N/A N/A N/A N/A N/A <2 N/A 37 N/A
MW-5D Voluntary Not Reported 6/22/2009 N/A 16.19 N/A 281 6.81 N/A 0.31 77 N/A N/A N/A N/A N/A N/A <1 N/A 34 N/A
MW-5D Voluntary Not Reported 12/14/2009 N/A 14.94 N/A 277.8 6.7 N/A 3.57 81 N/A N/A N/A N/A N/A N/A <1 N/A 36 N/A
MW-5D Voluntary Not Reported 6/28/2010 1.36 16.87 N/A 279.6 6.78 N/A 6.38 76 N/A N/A N/A N/A N/A N/A <1 N/A 35 N/A
MW-5D Voluntary Not Reported 2/4/2013 1.66 13.95 3.82 265 6.65 323 9 77 N/A N/A N/A <1 <1 <1 <1 33 34 N/A
MW-5D Voluntary Not Reported 10/15/2013 2.02 16.69 15.28 267 6.75 177 3.85 75 N/A N/A N/A N/A <1 N/A <1 N/A 34 N/A
MW-5D Voluntary Not Reported 2/4/2014 1.23 14.3 14.08 241 6.79 229 2.6 75 N/A N/A N/A <1 7.9 <1 <1 33 33 N/A
MW-5D Voluntary Not Reported 6/3/2014 1.54 15.82 0.4 263 6.49 242 8.92 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
MW-5S Voluntary Not Reported 12/16/2008 N/A 15.71 N/A 56 5.4 N/A 17.3 6.7 N/A N/A N/A N/A N/A N/A <2 N/A 14 N/A
MW-5S Voluntary Not Reported 6/22/2009 N/A 16.73 N/A 64.1 5.37 N/A 3.4 5.9 N/A N/A N/A N/A N/A N/A <1 N/A 13 N/A
MW-5S Voluntary Not Reported 12/14/2009 N/A 15.36 N/A 62.5 5.15 N/A 8.31 5.9 N/A N/A N/A N/A N/A N/A <1 N/A 15.1 N/A
MW-5S Voluntary Not Reported 6/28/2010 5.11 18.52 N/A 64.3 5.27 N/A 7.12 5.8 N/A N/A N/A N/A N/A N/A <1 N/A 15.1 N/A
MW-5S Voluntary Not Reported 12/6/2010 4.82 N/A N/A N/A N/A N/A 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-5S Voluntary Not Reported 2/1/2011 4.64 N/A N/A N/A N/A N/A 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-5S Voluntary Not Reported 6/7/2011 5.39 N/A N/A N/A N/A N/A 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-5S Voluntary Not Reported 10/4/2011 4.91 N/A N/A N/A N/A N/A 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-5S Voluntary Not Reported 2/4/2013 4.59 12.58 0.6 72 5.06 384 8.94 6.6 N/A N/A N/A <1 <1 <1 <1 22 21 N/A
MW-5S Voluntary Not Reported 10/15/2013 5.26 18.32 0.97 76 5.12 383 8.21 5 N/A N/A N/A N/A <1 N/A <1 N/A 24 N/A
MW-5S Voluntary Not Reported 2/4/2014 4.59 11.98 0.4 75 5.03 330 9.65 4.2 N/A N/A N/A <1 <1 <1 <1 22 25 N/A
MW-5S Voluntary Not Reported 6/3/2014 5.14 15.68 0.07 78 4.84 378 6.61 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
MW-6D Voluntary Not Reported 12/16/2008 N/A 15.63 N/A 162.7 6.48 N/A 2.67 36 N/A N/A N/A N/A N/A N/A <2 N/A 8 N/A
MW-6D Voluntary Not Reported 6/22/2009 N/A 16.97 N/A 170.7 6.58 N/A 1.21 35 N/A N/A N/A N/A N/A N/A <1 N/A 8 N/A
MW-6D Voluntary Not Reported 12/14/2009 N/A 15.45 N/A 169.7 6.45 N/A 3.23 34 N/A N/A N/A N/A N/A N/A <1 N/A 8 N/A
MW-6D Voluntary Not Reported 6/28/2010 -0.86 17.54 N/A 170.1 6.7 N/A 4.91 34 N/A N/A N/A N/A N/A N/A <1 N/A 7.6 N/A
MW-6S Voluntary Not Reported 12/16/2008 N/A 15.67 N/A 141.7 6.31 N/A 168 23 N/A N/A N/A N/A N/A N/A <2 N/A 13 N/A
MW-6S Voluntary Not Reported 6/22/2009 N/A 16.88 N/A 149.8 6.38 N/A 8.88 22 N/A N/A N/A N/A N/A N/A <1 N/A 9 N/A
MW-6S Voluntary Not Reported 12/14/2009 N/A 15.78 N/A 149.7 6.28 N/A 19.8 23 N/A N/A N/A N/A N/A N/A <1 N/A 9.44 N/A
MW-6S Voluntary Not Reported 6/28/2010 0.68 17.26 N/A 151.7 6.39 N/A 3.67 22 N/A N/A N/A N/A N/A N/A <1 N/A 8.8 N/A
MW-6S Voluntary Not Reported 12/6/2010 0.85 N/A N/A N/A N/A N/A 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-6S Voluntary Not Reported 2/1/2011 0.82 N/A N/A N/A N/A N/A 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-6S Voluntary Not Reported 6/7/2011 0.8 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
MW-6S Voluntary Not Reported 10/4/2011 0.73 N/A N/A N/A N/A N/A 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-7D Upgradient Not Reported 12/16/2008 N/A 15.6 N/A 38.3 5.92 N/A 1.22 17 N/A N/A N/A N/A N/A N/A <2 N/A 25 N/A
MW-7D Upgradient Not Reported 6/22/2009 N/A 16.83 N/A 40 5.78 N/A 3.07 15 N/A N/A N/A N/A N/A N/A <1 N/A 24 N/A
MW-7D Upgradient Not Reported 12/14/2009 N/A 15.01 N/A 35 5.85 N/A 1.13 17 N/A N/A N/A N/A N/A N/A <1 N/A 25 N/A
MW-7D Upgradient Not Reported 6/28/2010 46.71 17.27 N/A 39 5.64 N/A 1.14 16 N/A N/A N/A N/A N/A N/A <1 N/A 25.1 N/A
MW-7D Upgradient Not Reported 12/6/2010 48.38 13.31 N/A 37 5.79 N/A 0.74 N/A N/A N/A N/A N/A <1 N/A <1 N/A 25 N/A
MW-7D Upgradient Not Reported 2/2/2011 48.58 15.7 N/A 32.9 5.61 N/A 8.82 N/A N/A N/A N/A N/A <1 N/A <1 N/A 25 N/A
MW-7D Upgradient Not Reported 6/6/2011 49.18 17.15 N/A 33 5.79 N/A 0.59 N/A N/A N/A N/A N/A <1 N/A <1 N/A 26 N/A
MW-7D Upgradient Not Reported 10/4/2011 50.24 15.45 N/A 38 5.8 N/A 0.44 N/A N/A N/A N/A N/A <1 N/A <1 N/A 26 N/A
MW-7D Upgradient Not Reported 2/22/2012 49.41 15.47 8.31 36 5.56 403 1.48 N/A N/A N/A N/A N/A <1 N/A <1 N/A 26 N/A
MW-7D Upgradient Not Reported 6/5/2012 49.9 15.88 3.73 36 5.68 359 1.2 N/A N/A N/A N/A N/A <1 N/A <1 N/A 26 N/A
MW-7D Upgradient Not Reported 10/3/2012 50.54 16.47 8.31 37 5.68 369 0.29 N/A N/A N/A N/A N/A <1 N/A <1 N/A 27 N/A
MW-7D Upgradient Not Reported 2/4/2013 50.38 15.57 8.16 37 5.51 395 0.89 17 N/A N/A N/A <1 <1 <1 <1 26 27 N/A
MW-7D Upgradient Not Reported 6/3/2013 49.61 15.93 7.92 37 5.5 372 0.42 15 N/A N/A N/A N/A <1 N/A <1 N/A 27 N/A
MW-7D Upgradient Not Reported 10/14/2013 50.43 15.92 7.88 37 5.69 371 3 16 N/A N/A N/A N/A 1.04 N/A <1 N/A 27 N/A
MW-7D Upgradient Not Reported 2/5/2014 50.33 15.43 8.09 37 5.62 401 2.05 16 N/A N/A N/A <1 <1 <1 <1 27 26 N/A
MW-7D Upgradient Not Reported 6/2/2014 49.52 15.82 8.03 37 5.48 394 4.73 11 N/A N/A N/A N/A <1 N/A <1 N/A 27 N/A
MW-7SR Upgradient Residuum 12/6/2010 49.29 13.21 N/A 29 5.48 N/A 2.76 N/A N/A N/A N/A N/A <1 N/A <1 N/A 29 N/A
MW-7SR Upgradient Residuum 2/2/2011 49.52 15.36 N/A 23.4 5.33 N/A 2.84 N/A N/A N/A N/A N/A <1 N/A <1 N/A 20 N/A
MW-7SR Upgradient Residuum 6/6/2011 50.12 16.69 N/A 24 5.34 N/A 6.25 N/A N/A N/A N/A N/A <1 N/A <1 N/A 21 N/A
Tables - Page 8
Table 4 - Groundwater Analytical Results
Depth to
Water Temp.DO Cond.pH ORP Turbidity Aluminum Beryllium
Feet ˚C mg/L µmhos/cm SU mV NTU mg/L CaCO3 mg/L HCO3-mg/L CO32-µg/L µg/L
NE NE NE NE 6.5 - 8.5 NE NE NE NE NE NE 4*
Analytical Method 2320B4d N/A N/A 0 N/A
Well Name Well Type Hydrostratigraphic Unit Sample Collection Date Total Dissolved Total Dissolved Total Dissolved Total Total
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
Analytical Parameter Alkalinity Antimony Arsenic Barium
1*10 700
Field Measurements
200.8 200.8 200.7
Total
µg/L µg/L µg/L
MW-7SR Upgradient Residuum 10/4/2011 51.24 15.31 N/A 28 5.37 N/A 4.39 N/A N/A N/A N/A N/A <1 N/A <1 N/A 18 N/A
MW-7SR Upgradient Residuum 2/22/2012 50.39 15.32 6.69 21 5.13 374 1.8 N/A N/A N/A N/A N/A <1 N/A <1 N/A 16 N/A
MW-7SR Upgradient Residuum 6/5/2012 50.88 16.01 3.86 22 5.19 349 0.8 N/A N/A N/A N/A N/A <1 N/A <1 N/A 15 N/A
MW-7SR Upgradient Residuum 10/3/2012 51.55 16.78 5.8 22 5.24 382 1.28 N/A N/A N/A N/A N/A <1 N/A <1 N/A 15 N/A
MW-7SR Upgradient Residuum 2/4/2013 51.44 15.17 5.69 20 5.12 368 1.34 7.2 N/A N/A N/A <1 <1 <1 <1 14 14 N/A
MW-7SR Upgradient Residuum 6/3/2013 50.57 16.24 5.86 20 4.96 366 0.81 <0.1 N/A N/A N/A N/A <1 N/A <1 N/A 14 N/A
MW-7SR Upgradient Residuum 10/14/2013 51.4 16.52 6.81 22 5.29 348 9.17 6.5 N/A N/A N/A N/A <1 N/A <1 N/A 14 N/A
MW-7SR Upgradient Residuum 2/5/2014 51.33 14.55 7.1 19 5.06 403 3.02 7.7 N/A N/A N/A <1 <1 <1 <1 N/A 12 N/A
MW-7SR Upgradient Residuum 6/2/2014 50.59 17.38 6.87 20 5.05 415 5.66 <5 N/A N/A N/A N/A <1 N/A <1 N/A 14 N/A
MW-8D Compliance Transition (Saprolite)12/6/2010 47.68 13.47 N/A 90 7.08 N/A 217 N/A N/A N/A N/A N/A <1 N/A <1 N/A 67 N/A
MW-8D Compliance Transition (Saprolite)2/1/2011 48.51 14.27 N/A 90 6.84 N/A 60 N/A N/A N/A N/A N/A <1 N/A <1 N/A 43 N/A
MW-8D Compliance Transition (Saprolite)6/7/2011 49 17.97 N/A 95 7 N/A 25 N/A N/A N/A N/A N/A <1 N/A <1 N/A 34 N/A
MW-8D Compliance Transition (Saprolite)10/3/2011 50.2 15.38 N/A 88 6.8 N/A 27.4 N/A N/A N/A N/A N/A <1 N/A <1 N/A 39 N/A
MW-8D Compliance Transition (Saprolite)2/6/2012 50.07 13.93 5.7 82 6.77 241 41.4 N/A N/A N/A N/A N/A <1 N/A <1 N/A 44 N/A
MW-8D Compliance Transition (Saprolite)6/4/2012 49.54 16.22 6.71 79 6.81 262 76 N/A N/A N/A N/A N/A <1 N/A <1 N/A 46 N/A
MW-8D Compliance Transition (Saprolite)10/3/2012 50.44 17.75 7.85 76 6.49 365 100 N/A N/A N/A N/A N/A <1 N/A <1 N/A 45 N/A
MW-8D Compliance Transition (Saprolite)2/4/2013 51.27 14.12 3.98 82 6.41 171 44 41 N/A N/A N/A <1 <1 <1 <1 18 36 N/A
MW-8D Compliance Transition (Saprolite)6/3/2013 49.34 16.54 4.14 81 6.27 167 36 38 N/A N/A N/A N/A <1 N/A <1 N/A 27 N/A
MW-8D Compliance Transition (Saprolite)10/14/2013 49.41 16.24 4.78 75 6.31 286 24.7 36 N/A N/A N/A N/A <1 N/A <1 N/A 23 N/A
MW-8D Compliance Transition (Saprolite)2/4/2014 49.58 13.38 6.62 75 6.38 345 110 36 N/A N/A N/A <1 <1 <1 <1 16 44 N/A
MW-8D Compliance Transition (Saprolite)6/2/2014 47.01 16.86 7.15 71 6.34 366 93.7 32 N/A N/A N/A N/A <1 N/A <1 N/A 31 N/A
MW-8I Compliance Residuum 12/6/2010 45.28 13.47 N/A 87 6.82 N/A 32.2 N/A N/A N/A N/A N/A <1 N/A <1 N/A 53 N/A
MW-8I Compliance Residuum 2/1/2011 46.18 14.27 N/A 74 6.4 N/A 20.4 N/A N/A N/A N/A N/A <1 N/A <1 N/A 48 N/A
MW-8I Compliance Residuum 6/7/2011 46.6 17.44 N/A 61 6.33 N/A 17.7 N/A N/A N/A N/A N/A <1 N/A <1 N/A 41 N/A
MW-8I Compliance Residuum 10/3/2011 47.89 15.56 N/A 57 6.4 N/A 37.2 N/A N/A N/A N/A N/A <1 N/A <1 N/A 44 N/A
MW-8I Compliance Residuum 2/6/2012 47.8 14.51 9.14 54 6.4 350 32.2 N/A N/A N/A N/A N/A <1 N/A <1 N/A 40 N/A
MW-8I Compliance Residuum 6/4/2012 47.03 16.47 9.37 52 6.38 333 38.7 N/A N/A N/A N/A N/A <1 N/A <1 N/A 38 N/A
MW-8I Compliance Residuum 10/3/2012 48.15 16.82 8.57 49 6.09 440 23 N/A N/A N/A N/A N/A <1 N/A <1 N/A 37 N/A
MW-8I Compliance Residuum 2/4/2013 49 14.83 9.88 48 6.05 384 19.8 24 N/A N/A N/A <1 <1 <1 <1 24 35 N/A
MW-8I Compliance Residuum 6/3/2013 46.89 16.74 9.44 47 5.65 401 14.1 21 N/A N/A N/A N/A <1 N/A <1 N/A 30 N/A
MW-8I Compliance Residuum 10/14/2013 46.87 16.36 9.92 47 6 387 9.87 22 N/A N/A N/A N/A <1 N/A <1 N/A 29 N/A
MW-8I Compliance Residuum 2/4/2014 47.55 12.88 10.45 47 6.03 399 10.8 23 N/A N/A N/A <1 <1 <1 <1 26 29 N/A
MW-8I Compliance Residuum 6/2/2014 44.23 17.77 9.97 46 5.98 385 18.2 19 N/A N/A N/A N/A <1 N/A <1 N/A 31 N/A
MW-8S Compliance Residuum 12/6/2010 43.85 11.8 N/A 19 5.33 N/A 13.2 N/A N/A N/A N/A N/A <1 N/A <1 N/A 47 N/A
MW-8S Compliance Residuum 2/1/2011 44.83 13.54 N/A 19 5.22 N/A 18 N/A N/A N/A N/A N/A <1 N/A <1 N/A 48 N/A
MW-8S Compliance Residuum 6/7/2011 45.08 16.86 N/A 17 4.94 N/A 9.98 N/A N/A N/A N/A N/A <1 N/A <1 N/A 51 N/A
MW-8S Compliance Residuum 10/3/2011 46.58 14.42 N/A 18 5.22 N/A 7.89 N/A N/A N/A N/A N/A <1 N/A <1 N/A 51 N/A
MW-8S Compliance Residuum 2/6/2012 46.41 12.74 8.23 18 5.08 443 16 N/A N/A N/A N/A N/A <1 N/A <1 N/A 50 N/A
MW-8S Compliance Residuum 6/4/2012 45.14 16.14 8.17 20 5.07 409 6.76 N/A N/A N/A N/A N/A <1 N/A <1 N/A 53 N/A
MW-8S Compliance Residuum 10/3/2012 46.94 17.2 7.76 16 5.01 470 7.65 N/A N/A N/A N/A N/A <1 N/A <1 N/A 52 N/A
MW-8S Compliance Residuum 2/4/2013 47.77 14.52 8.21 15 4.92 444 2.77 3.3 N/A N/A N/A <1 <1 <1 <1 51 51 N/A
MW-8S Compliance Residuum 6/3/2013 45.13 16.21 7.84 19 4.34 463 4.18 <0.1 N/A N/A N/A N/A <1 N/A <1 N/A 55 N/A
MW-8S Compliance Residuum 10/14/2013 45.31 15.92 7.6 19 4.71 452 6.12 1.8 N/A N/A N/A N/A <1 N/A <1 N/A 57 N/A
MW-8S Compliance Residuum 2/4/2014 46.08 14.71 8.15 17 4.8 473 7.07 1.8 N/A N/A N/A <1 <1 <1 <1 56 56 N/A
MW-8S Compliance Residuum 6/2/2014 41.71 16.32 7.55 20 4.78 442 9.46 <5 N/A N/A N/A N/A <1 N/A <1 N/A 58 N/A
MW-9 Compliance Residuum 12/6/2010 3.86 14.51 N/A 134.1 6.14 N/A 139 N/A N/A N/A N/A N/A <1 N/A <1 N/A 89 N/A
MW-9 Compliance Residuum 2/1/2011 3.67 14.67 N/A 133 6.13 N/A 29.5 N/A N/A N/A N/A N/A <1 N/A <1 N/A 61 N/A
MW-9 Compliance Residuum 6/6/2011 3.85 17.1 N/A 133 6.4 N/A 21.2 N/A N/A N/A N/A N/A <1 N/A <1 N/A 60 N/A
MW-9 Compliance Residuum 10/4/2011 3.88 15.68 N/A 142 6.23 N/A 12.6 N/A N/A N/A N/A N/A <1 N/A <1 N/A 58 N/A
MW-9 Compliance Residuum 2/6/2012 3.09 14.65 2.88 148 6.29 368 49.7 N/A N/A N/A N/A N/A <1 N/A <1 N/A 71 N/A
MW-9 Compliance Residuum 6/5/2012 3.56 16 3.8 152 6.03 332 14.3 N/A N/A N/A N/A N/A <1 N/A <1 N/A 62 N/A
MW-9 Compliance Residuum 10/3/2012 3.74 17.01 3.21 157 6.1 296 14.4 N/A N/A N/A N/A N/A <1 N/A <1 N/A 65 N/A
MW-9 Compliance Residuum 2/4/2013 3.43 14.3 3.69 162 5.99 382 37 42 N/A N/A N/A <1 <1 <1 <1 62 74 N/A
MW-9 Compliance Residuum 6/4/2013 3.41 15.66 2.77 170 5.82 386 10.3 40 N/A N/A N/A N/A <1 N/A <1 N/A 70 N/A
MW-9 Compliance Residuum 10/15/2013 4.06 15.86 2.76 167 6.01 303 5.82 41 N/A N/A N/A N/A <1 N/A <1 N/A 66 N/A
MW-9 Compliance Residuum 2/5/2014 3.06 15.67 2.73 169 5.98 356 4.79 41 N/A N/A N/A <1 <1 <1 <1 67 69 N/A
MW-9 Compliance Residuum 6/2/2014 3.32 15.57 2.77 167 6 414 4.28 39 N/A N/A N/A N/A <1 N/A <1 N/A 69 N/A
Tables - Page 9
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection Date
MW-10 Compliance Residuum 12/6/2010
MW-10 Compliance Residuum 2/1/2011
MW-10 Compliance Residuum 6/7/2011
MW-10 Compliance Residuum 10/3/2011
MW-10 Compliance Residuum 2/6/2012
MW-10 Compliance Residuum 6/4/2012
MW-10 Compliance Residuum 10/3/2012
MW-10 Compliance Residuum 2/4/2013
MW-10 Compliance Residuum 6/4/2013
MW-10 Compliance Residuum 10/15/2013
MW-10 Compliance Residuum 2/3/2014
MW-10 Compliance Residuum 6/2/2014
MW-11DR Compliance Bedrock 2/1/2011
MW-11DR Compliance Bedrock 6/6/2011
MW-11DR Compliance Bedrock 10/3/2011
MW-11DR Compliance Bedrock 2/6/2012
MW-11DR Compliance Bedrock 6/4/2012
MW-11DR Compliance Bedrock 10/3/2012
MW-11DR Compliance Bedrock 2/4/2013
MW-11DR Compliance Bedrock 6/3/2013
MW-11DR Compliance Bedrock 10/14/2013
MW-11DR Compliance Bedrock 2/3/2014
MW-11DR Compliance Bedrock 6/2/2014
MW-11SR Compliance Residuum 2/1/2011
MW-11SR Compliance Residuum 6/6/2011
MW-11SR Compliance Residuum 10/3/2011
MW-11SR Compliance Residuum 2/6/2012
MW-11SR Compliance Residuum 6/4/2012
MW-11SR Compliance Residuum 10/3/2012
MW-11SR Compliance Residuum 2/4/2013
MW-11SR Compliance Residuum 6/3/2013
MW-11SR Compliance Residuum 10/14/2013
MW-11SR Compliance Residuum 2/3/2014
MW-11SR Compliance Residuum 6/2/2014
MW-12 Compliance Residuum 12/6/2010
MW-12 Compliance Residuum 2/1/2011
MW-13 Compliance Residuum 12/6/2010
MW-13 Compliance Residuum 2/1/2011
MW-13 Compliance Residuum 6/7/2011
MW-13 Compliance Residuum 10/4/2011
MW-13 Compliance Residuum 2/6/2012
MW-13 Compliance Residuum 6/5/2012
MW-13 Compliance Residuum 10/3/2012
MW-13 Compliance Residuum 2/5/2013
MW-13 Compliance Residuum 6/3/2013
MW-13 Compliance Residuum 10/15/2013
MW-13 Compliance Residuum 2/3/2014
MW-13 Compliance Residuum 6/2/2014
MW-14 Compliance Residuum 12/6/2010
MW-14 Compliance Residuum 2/1/2011
MW-14 Compliance Residuum 6/7/2011
MW-14 Compliance Residuum 10/4/2011
MW-14 Compliance Residuum 2/6/2012
MW-14 Compliance Residuum 6/5/2012
MW-14 Compliance Residuum 10/3/2012
MW-14 Compliance Residuum 2/4/2013
MW-14 Compliance Residuum 6/3/2013
MW-14 Compliance Residuum 10/15/2013
MW-14 Compliance Residuum 2/3/2014
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
Analytical Parameter Chloride Flouride
mg/L mg/L
250 2
300
Dissolved Total Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total
N/A 125 N/A <1 N/A N/A 7.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 1710 N/A 2.59 N/A N/A
N/A 194 N/A <1 N/A N/A 7 N/A <5 N/A N/A N/A <0.005 0.000 N/A 1420 N/A 1.15 N/A N/A
N/A 115 N/A <1 N/A N/A 6.9 N/A <5 N/A N/A N/A <0.005 0.000 N/A 147 N/A <1 N/A N/A
N/A 370 N/A <1 N/A N/A 6 N/A <5 N/A N/A N/A <0.005 0.000 N/A 634 N/A <1 N/A N/A
N/A 94 N/A <1 N/A N/A 7.6 N/A <5 N/A N/A N/A <0.005 0.000 N/A 310 N/A <1 N/A N/A
N/A 123 N/A <1 N/A N/A 6.5 N/A <5 N/A N/A N/A <0.005 0.000 N/A 72 N/A <1 N/A N/A
N/A 383 N/A <1 N/A N/A 5.8 N/A <5 N/A N/A N/A <0.005 0.000 N/A 235 N/A <1 N/A N/A
147 178 <1 <1 3.8 4.32 6.8 <5 <5 N/A N/A <0.005 <0.005 0.000 15 79 <1 <1 2.43 2.72
N/A 96 N/A <1 N/A 2.92 7.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 509 N/A <1 N/A 2.29
N/A 353 N/A <1 N/A 6.86 6.3 N/A <5 N/A N/A N/A <0.005 0.000 N/A 295 N/A <1 N/A 4.11
150 145 <1 <1 3.69 3.78 7.2 <5 <5 N/A N/A <0.005 <0.005 0.000 <10 220 <1 <1 2.58 2.74
N/A 127 N/A <1 N/A 3.65 6.7 N/A <5 N/A N/A N/A <0.005 0.000 N/A 921 N/A <1 N/A 2.83
N/A 362 N/A <1 N/A N/A 7.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 21 N/A <1 N/A N/A
N/A 362 N/A <1 N/A N/A 7.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 13 N/A <1 N/A N/A
N/A 369 N/A <1 N/A N/A 7 N/A <5 N/A N/A N/A <0.005 0.000 N/A <10 N/A <1 N/A N/A
N/A 374 N/A <1 N/A N/A 6.7 N/A <5 N/A N/A N/A <0.005 0.000 N/A 11 N/A <1 N/A N/A
N/A 366 N/A <1 N/A N/A 6.7 N/A <5 N/A N/A N/A <0.005 0.000 N/A <10 N/A <1 N/A N/A
N/A 372 N/A <1 N/A N/A 6.4 N/A <5 N/A N/A N/A <0.005 0.000 N/A <10 N/A <1 N/A N/A
347 342 <1 <1 9.1 8.91 6.7 <5 <5 N/A N/A <0.005 <0.005 0.000 <10 <10 <1 <1 6.26 6.13
N/A 413 N/A <1 N/A 10.1 6.8 N/A <5 N/A N/A N/A <0.005 0.000 N/A 11 N/A <1 N/A 6.77
N/A 375 N/A <1 N/A 9.31 7 N/A <5 N/A N/A N/A <0.005 0.000 N/A <10 N/A <1 N/A 6.27
371 367 <1 <1 9.23 9.4 6.8 <5 <5 N/A N/A <0.005 <0.005 0.000 <10 <10 <1 <1 6.05 6.28
N/A 353 N/A <1 N/A 9.3 6.6 N/A <5 N/A N/A N/A <0.005 0.000 N/A <10 N/A <1 N/A 6.11
N/A 366 N/A <1 N/A N/A 7.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 486 N/A <1 N/A N/A
N/A 365 N/A <1 N/A N/A 7.3 N/A <5 N/A N/A N/A <0.005 0.000 N/A 138 N/A <1 N/A N/A
N/A 368 N/A <1 N/A N/A 7 N/A <5 N/A N/A N/A <0.005 0.000 N/A 87 N/A <1 N/A N/A
N/A 371 N/A <1 N/A N/A 6.7 N/A <5 N/A N/A N/A <0.005 0.000 N/A 63 N/A <1 N/A N/A
N/A 362 N/A <1 N/A N/A 6.6 N/A <5 N/A N/A N/A <0.005 0.000 N/A 39 N/A <1 N/A N/A
N/A 368 N/A <1 N/A N/A 6.5 N/A <5 N/A N/A N/A <0.005 0.000 N/A 30 N/A <1 N/A N/A
354 349 <1 <1 9.6 9.42 6.7 <5 <5 N/A N/A <0.005 <0.005 0.000 14 28 <1 <1 6.17 6.05
N/A 390 N/A <1 N/A 9.85 6.9 N/A <5 N/A N/A N/A <0.005 0.000 N/A 38 N/A <1 N/A 6.24
N/A 379 N/A <1 N/A 9.7 7.1 N/A <5 N/A N/A N/A <0.005 0.000 N/A 67 N/A <1 N/A 6.15
379 377 <1 <1 9.55 9.78 6.8 <5 <5 N/A N/A <0.005 <0.005 0.000 <10 20 <1 <1 5.95 6.2
N/A 366 N/A <1 N/A 9.59 6.6 N/A <5 N/A N/A N/A <0.005 0.000 N/A 62 N/A <1 N/A 6.06
N/A 289 N/A <1 N/A N/A 6.1 N/A <5 N/A N/A N/A <0.005 0.000 N/A 85 N/A <1 N/A N/A
N/A 289 N/A <1 N/A N/A 6.3 N/A <5 N/A N/A N/A <0.005 0.000 N/A 113 N/A <1 N/A N/A
N/A 60 N/A <1 N/A N/A 4.6 N/A <5 N/A N/A N/A <0.005 0.000 N/A 13500 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 5 N/A <5 N/A N/A N/A <0.005 0.000 N/A 19000 N/A <1 N/A N/A
N/A 52 N/A <1 N/A N/A 5 N/A <5 N/A N/A N/A <0.005 0.000 N/A 18300 N/A <1 N/A N/A
N/A 62 N/A <1 N/A N/A 4.4 N/A <5 N/A N/A N/A <0.005 0.000 N/A 20600 N/A <1 N/A N/A
N/A 54 N/A <1 N/A N/A 7.1 N/A <5 N/A N/A N/A <0.005 0.000 N/A 19300 N/A <1 N/A N/A
N/A 61 N/A <1 N/A N/A 4.5 N/A <5 N/A N/A N/A <0.005 0.000 N/A 19200 N/A <1 N/A N/A
N/A 65 N/A <1 N/A N/A 3.6 N/A <5 N/A N/A N/A <0.005 0.000 N/A 23000 N/A <1 N/A N/A
<50 <50 <1 <1 10.2 10.3 5.1 <5 <5 N/A N/A <0.005 <0.005 0.000 20900 21100 <1 <1 5.19 5.23
N/A 64 N/A <1 N/A 11.2 4.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 16900 N/A <1 N/A 5.57
N/A 50 N/A <1 N/A 10.3 4.7 N/A <5 N/A N/A N/A <0.005 0.000 N/A 7690 N/A <1 N/A 5.28
<50 <50 <1 <1 16.8 17.3 11 <5 <5 N/A N/A <0.005 <0.005 0.000 32500 37700 <1 <1 6.6 6.76
N/A 61 N/A <1 N/A 10.5 3.7 N/A <5 N/A N/A N/A <0.005 0.000 N/A 24200 N/A <1 N/A 5.13
N/A 143 N/A <1 N/A N/A 6.6 N/A <5 N/A N/A N/A <0.005 0.000 N/A 554 N/A <1 N/A N/A
N/A 109 N/A <1 N/A N/A 6.9 N/A <5 N/A N/A N/A <0.005 0.000 N/A 378 N/A <1 N/A N/A
N/A 104 N/A <1 N/A N/A 8.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 175 N/A <1 N/A N/A
N/A 149 N/A <1 N/A N/A 7.6 N/A <5 N/A N/A N/A <0.005 0.000 N/A 58 N/A <1 N/A N/A
N/A 96 N/A <1 N/A N/A 9.5 N/A 6 N/A N/A N/A <0.005 0.000 N/A 935 N/A <1 N/A N/A
N/A 90 N/A <1 N/A N/A 9.6 N/A <5 N/A N/A N/A <0.005 0.000 N/A 206 N/A <1 N/A N/A
N/A 124 N/A <1 N/A N/A 7.3 N/A <5 N/A N/A N/A <0.005 0.000 N/A 98 N/A <1 N/A N/A
114 109 <1 <1 6.99 7.15 9.2 <5 <5 N/A N/A <0.005 <0.005 0.000 <10 104 <1 <1 17.5 18.1
N/A <50 N/A <1 N/A 8.33 8.4 N/A <5 N/A N/A N/A <0.005 0.000 N/A 371 N/A <1 N/A 21
N/A <50 N/A <1 N/A 7.71 8 N/A <5 N/A N/A N/A <0.005 0.000 N/A 374 N/A <1 N/A 18.5
<50 <50 <1 <1 8.32 8.24 9.2 <5 <5 N/A N/A <0.005 <0.005 0.000 13 660 <1 <1 20.6 20.9
Lead MagnesiumBoron
mg/L
200.8 200.7 200.7 200.8 200.7 200.7 200.8 200.7200.7
2 NE 10 1*1 300 15 NE700
µg/Lµg/L µg/L mg/L µg/L µg/L mg/L µg/L
Cadmium Calcium Chromium Cobalt Copper Iron
Tables - Page 10
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection Date
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
Analytical Parameter
MW-14 Compliance Residuum 6/2/2014
MW-15 Compliance Residuum 2/23/2011
MW-15 Compliance Residuum 6/6/2011
MW-15 Compliance Residuum 10/3/2011
MW-15 Compliance Residuum 2/6/2012
MW-15 Compliance Residuum 6/5/2012
MW-15 Compliance Residuum 10/3/2012
MW-15 Compliance Residuum 2/4/2013
MW-15 Compliance Residuum 6/3/2013
MW-15 Compliance Residuum 10/14/2013
MW-15 Compliance Residuum 2/3/2014
MW-15 Compliance Residuum 6/2/2014
MW-1D Voluntary Not Reported 12/16/2008
MW-1D Voluntary Not Reported 6/22/2009
MW-1D Voluntary Not Reported 12/14/2009
MW-1D Voluntary Not Reported 6/28/2010
MW-1S Voluntary Not Reported 12/16/2008
MW-1S Voluntary Not Reported 6/22/2009
MW-1S Voluntary Not Reported 12/14/2009
MW-1S Voluntary Not Reported 6/28/2010
MW-1S Voluntary Not Reported 12/6/2010
MW-1S Voluntary Not Reported 2/1/2011
MW-1S Voluntary Not Reported 6/7/2011
MW-2D Voluntary Not Reported 12/16/2008
MW-2D Voluntary Not Reported 6/22/2009
MW-2D Voluntary Not Reported 12/14/2009
MW-2D Voluntary Not Reported 6/28/2010
MW-2S Voluntary Not Reported 12/16/2008
MW-2S Voluntary Not Reported 6/22/2009
MW-2S Voluntary Not Reported 12/14/2009
MW-2S Voluntary Not Reported 6/28/2010
MW-2S Voluntary Not Reported 12/6/2010
MW-2S Voluntary Not Reported 2/1/2011
MW-2S Voluntary Not Reported 6/7/2011
MW-2S Voluntary Not Reported 10/3/2011
MW-3D Voluntary Not Reported 12/16/2008
MW-3D Voluntary Not Reported 6/22/2009
MW-3D Voluntary Not Reported 12/14/2009
MW-3D Voluntary Not Reported 6/28/2010
MW-3S Voluntary Not Reported 12/16/2008
MW-3S Voluntary Not Reported 6/22/2009
MW-3S Voluntary Not Reported 12/14/2009
MW-3S Voluntary Not Reported 6/28/2010
MW-3S Voluntary Not Reported 12/6/2010
MW-3S Voluntary Not Reported 2/1/2011
MW-3S Voluntary Not Reported 6/7/2011
MW-3S Voluntary Not Reported 10/4/2011
MW-4D Voluntary Not Reported 12/16/2008
MW-4D Voluntary Not Reported 6/22/2009
MW-4D Voluntary Not Reported 12/14/2009
MW-4D Voluntary Not Reported 6/28/2010
MW-4D Voluntary Not Reported 2/5/2013
MW-4D Voluntary Not Reported 10/15/2013
MW-4D Voluntary Not Reported 2/4/2014
MW-4D Voluntary Not Reported 6/3/2014
MW-4S Voluntary Not Reported 12/16/2008
MW-4S Voluntary Not Reported 6/22/2009
MW-4S Voluntary Not Reported 12/14/2009
MW-4S Voluntary Not Reported 6/28/2010
Chloride Flouride
mg/L mg/L
250 2
300
Dissolved Total Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total
Lead MagnesiumBoron
mg/L
200.8 200.7 200.7 200.8 200.7 200.7 200.8 200.7200.7
2 NE 10 1*1 300 15 NE700
µg/Lµg/L µg/L mg/L µg/L µg/L mg/L µg/L
Cadmium Calcium Chromium Cobalt Copper Iron
N/A <50 N/A <1 N/A 7.58 7.9 N/A <5 N/A N/A N/A <0.005 0.000 N/A 686 N/A <1 N/A 19.5
N/A 284 N/A <1 N/A N/A 7.1 N/A 5 N/A N/A N/A <0.005 0.000 N/A 227 N/A <1 N/A N/A
N/A 294 N/A <1 N/A N/A 6.4 N/A <5 N/A N/A N/A <0.005 0.000 N/A 274 N/A <1 N/A N/A
N/A 314 N/A <1 N/A N/A 6.5 N/A <5 N/A N/A N/A <0.005 0.000 N/A 198 N/A <1 N/A N/A
N/A 302 N/A <1 N/A N/A 6.7 N/A <5 N/A N/A N/A <0.005 0.000 N/A 399 N/A <1 N/A N/A
N/A 290 N/A <1 N/A N/A 6.6 N/A <5 N/A N/A N/A <0.005 0.000 N/A 45 N/A <1 N/A N/A
N/A 315 N/A <1 N/A N/A 6.5 N/A <5 N/A N/A N/A <0.005 0.000 N/A 55 N/A <1 N/A N/A
285 288 <1 <1 3.32 3.32 6.4 <5 <5 N/A N/A <0.005 <0.005 0.000 <10 58 <1 <1 2.58 2.58
N/A 305 N/A <1 N/A 3.62 6.7 N/A <5 N/A N/A N/A <0.005 0.000 N/A 74 N/A <1 N/A 2.8
N/A 312 N/A <1 N/A 3.64 6.8 N/A <5 N/A N/A N/A <0.005 0.000 N/A 168 N/A <1 N/A 2.83
300 294 <1 <1 3.36 3.36 7.1 <5 <5 N/A N/A <0.005 <0.005 0.000 40 75 <1 <1 2.7 2.76
N/A 273 N/A <1 N/A 3.61 6.6 N/A 5 N/A N/A N/A <0.005 0.000 N/A 230 N/A <1 N/A 2.87
N/A 552 N/A <0.5 N/A 26.5 6.7 N/A <1 N/A N/A N/A <0.002 0.110 N/A 88 N/A <2 N/A 8.21
N/A 509 N/A <1 N/A 25.3 7.2 N/A <1 N/A N/A N/A <0.001 <0.1 N/A 42 N/A <1 N/A 8.05
N/A 609 N/A <1 N/A 27.6 6.8 N/A <1 N/A N/A N/A <0.001 <0.1 N/A 28.2 N/A <1 N/A 8.75
N/A 604 N/A <1 N/A 0 7.4 N/A <1 N/A N/A N/A <0.001 1.200 N/A <10 N/A <1 N/A 8.41
N/A 176 N/A <0.5 N/A 2.47 8.3 N/A <1 N/A N/A N/A <0.002 0.100 N/A 33800 N/A <2 N/A 1.11
N/A 164 N/A <1 N/A 2.22 11 N/A <1 N/A N/A N/A 0.002 0.390 N/A 29100 N/A <1 N/A 1.02
N/A 228 N/A <1 N/A 2.31 9.6 N/A <1 N/A N/A N/A <0.001 <0.1 N/A 31200 N/A <1 N/A 1.04
N/A 199 N/A <1 N/A 2.18 8.7 N/A <1 N/A N/A N/A <0.001 <0.1 N/A 30700 N/A <1 N/A 1.01
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.000 N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.000 N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.000 N/A N/A N/A N/A N/A N/A
N/A <100 N/A <0.5 N/A 6.06 2.8 N/A 1.71 N/A N/A N/A <0.002 0.100 N/A 525 N/A <2 N/A 3.86
N/A <100 N/A <1 N/A 6.43 4.2 N/A 1.68 N/A N/A N/A <0.001 <0.1 N/A 262 N/A <1 N/A 3.98
N/A <50 N/A <1 N/A 6.48 3.6 N/A 1.5 N/A N/A N/A 0.002 <0.1 N/A 376 N/A <1 N/A 3.95
N/A <50 N/A <1 N/A 6.89 5.9 N/A 1.4 N/A N/A N/A <0.001 1.100 N/A 44.5 N/A <1 N/A 3.96
N/A 387 N/A <0.5 N/A 8.72 8 N/A <1 N/A N/A N/A 0.004 <0.1 N/A 21 N/A <2 N/A 1.92
N/A 254 N/A <1 N/A 7.39 6.2 N/A <1 N/A N/A N/A 0.003 <0.1 N/A 26 N/A <1 N/A 1.62
N/A 332 N/A <1 N/A 8.33 9.3 N/A <1 N/A N/A N/A 0.004 <0.1 N/A 16.4 N/A <1 N/A 1.8
N/A 254 N/A <1 N/A 8.71 5.7 N/A <1 N/A N/A N/A 0.004 1.100 N/A 14.3 N/A <1 N/A 1.86
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 0.000 N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.000 N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.000 N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.000 N/A N/A N/A N/A N/A N/A
N/A 259 N/A <0.5 N/A 18.1 5.5 N/A 1.22 N/A N/A N/A <0.002 <0.1 N/A 68 N/A <2 N/A 9.11
N/A 233 N/A <1 N/A 17.1 5.9 N/A 1.25 N/A N/A N/A <0.001 <0.1 N/A <10 N/A <1 N/A 8.72
N/A 271 N/A <1 N/A 18.3 5.7 N/A 1.3 N/A N/A N/A <0.001 <0.1 N/A 11.2 N/A <1 N/A 9.27
N/A 263 N/A <1 N/A 18.2 6.5 N/A 1.3 N/A N/A N/A 0.001 <0.1 N/A 29.4 N/A <1 N/A 9.13
N/A 241 N/A <0.5 N/A 15.5 7.6 N/A <1 N/A N/A N/A <0.002 <0.1 N/A 3390 N/A <2 N/A 9.79
N/A 234 N/A <1 N/A 14.3 6.1 N/A <1 N/A N/A N/A <0.001 <0.1 N/A 3760 N/A <1 N/A 9.41
N/A 245 N/A <1 N/A 15.4 6.5 N/A <1 N/A N/A N/A <0.001 0.120 N/A 5710 N/A <1 N/A 10.1
N/A 259 N/A <1 N/A 14.3 4.5 N/A <1 N/A N/A N/A <0.001 <0.1 N/A 4510 N/A <1 N/A 9.32
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 0.000 N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.000 N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.000 N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.000 N/A N/A N/A N/A N/A N/A
N/A 258 N/A <0.5 N/A 11.8 5.9 N/A 1.59 N/A N/A N/A <0.002 <0.1 N/A 2640 N/A <2 N/A 5.59
N/A 230 N/A <1 N/A 10.7 7.1 N/A 1.52 N/A N/A N/A <0.001 0.110 N/A 2050 N/A <1 N/A 5.01
N/A 268 N/A <1 N/A 11.3 6 N/A 1.4 N/A N/A N/A <0.001 <0.1 N/A 1970 N/A <1 N/A 5.06
N/A 259 N/A <1 N/A 12.1 6.3 N/A 2.2 N/A N/A N/A 0.002 <0.1 N/A 2720 N/A <1 N/A 5.53
253 251 <1 <1 10.3 10.6 5.7 <5 <5 N/A N/A <0.005 <0.005 0.000 66 1080 <1 <1 3.59 4.13
N/A 270 N/A <1 N/A 11.2 6 N/A <5 N/A N/A N/A <0.005 0.000 N/A 786 N/A <1 N/A 4.18
283 284 <1 <1 11.1 11.6 6 <5 <5 N/A N/A <0.005 <0.005 0.000 18 1250 <1 <1 3.72 4.33
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 0.000 N/A N/A N/A N/A N/A N/A
N/A 304 N/A <0.5 N/A 4.65 6.3 N/A 2.43 N/A N/A N/A <0.002 <0.1 N/A 370 N/A <2 N/A 3.58
N/A 287 N/A <1 N/A 5.7 8 N/A 3.08 N/A N/A N/A 0.001 0.200 N/A 287 N/A <1 N/A 4.39
N/A 340 N/A <1 N/A 6.01 5.7 N/A 2.8 N/A N/A N/A <0.001 <0.1 N/A 654 N/A 1.2 N/A 4.55
N/A 328 N/A <1 N/A 6.46 5.6 N/A 3.3 N/A N/A N/A <0.001 <0.1 N/A 221 N/A <1 N/A 4.81
Tables - Page 11
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection Date
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
Analytical Parameter
MW-4S Voluntary Not Reported 12/6/2010
MW-4S Voluntary Not Reported 2/1/2011
MW-4S Voluntary Not Reported 6/7/2011
MW-4S Voluntary Not Reported 10/4/2011
MW-4S Voluntary Not Reported 2/5/2013
MW-4S Voluntary Not Reported 10/15/2013
MW-4S Voluntary Not Reported 2/4/2014
MW-4S Voluntary Not Reported 6/3/2014
MW-5D Voluntary Not Reported 12/16/2008
MW-5D Voluntary Not Reported 6/22/2009
MW-5D Voluntary Not Reported 12/14/2009
MW-5D Voluntary Not Reported 6/28/2010
MW-5D Voluntary Not Reported 2/4/2013
MW-5D Voluntary Not Reported 10/15/2013
MW-5D Voluntary Not Reported 2/4/2014
MW-5D Voluntary Not Reported 6/3/2014
MW-5S Voluntary Not Reported 12/16/2008
MW-5S Voluntary Not Reported 6/22/2009
MW-5S Voluntary Not Reported 12/14/2009
MW-5S Voluntary Not Reported 6/28/2010
MW-5S Voluntary Not Reported 12/6/2010
MW-5S Voluntary Not Reported 2/1/2011
MW-5S Voluntary Not Reported 6/7/2011
MW-5S Voluntary Not Reported 10/4/2011
MW-5S Voluntary Not Reported 2/4/2013
MW-5S Voluntary Not Reported 10/15/2013
MW-5S Voluntary Not Reported 2/4/2014
MW-5S Voluntary Not Reported 6/3/2014
MW-6D Voluntary Not Reported 12/16/2008
MW-6D Voluntary Not Reported 6/22/2009
MW-6D Voluntary Not Reported 12/14/2009
MW-6D Voluntary Not Reported 6/28/2010
MW-6S Voluntary Not Reported 12/16/2008
MW-6S Voluntary Not Reported 6/22/2009
MW-6S Voluntary Not Reported 12/14/2009
MW-6S Voluntary Not Reported 6/28/2010
MW-6S Voluntary Not Reported 12/6/2010
MW-6S Voluntary Not Reported 2/1/2011
MW-6S Voluntary Not Reported 6/7/2011
MW-6S Voluntary Not Reported 10/4/2011
MW-7D Upgradient Not Reported 12/16/2008
MW-7D Upgradient Not Reported 6/22/2009
MW-7D Upgradient Not Reported 12/14/2009
MW-7D Upgradient Not Reported 6/28/2010
MW-7D Upgradient Not Reported 12/6/2010
MW-7D Upgradient Not Reported 2/2/2011
MW-7D Upgradient Not Reported 6/6/2011
MW-7D Upgradient Not Reported 10/4/2011
MW-7D Upgradient Not Reported 2/22/2012
MW-7D Upgradient Not Reported 6/5/2012
MW-7D Upgradient Not Reported 10/3/2012
MW-7D Upgradient Not Reported 2/4/2013
MW-7D Upgradient Not Reported 6/3/2013
MW-7D Upgradient Not Reported 10/14/2013
MW-7D Upgradient Not Reported 2/5/2014
MW-7D Upgradient Not Reported 6/2/2014
MW-7SR Upgradient Residuum 12/6/2010
MW-7SR Upgradient Residuum 2/2/2011
MW-7SR Upgradient Residuum 6/6/2011
Chloride Flouride
mg/L mg/L
250 2
300
Dissolved Total Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total
Lead MagnesiumBoron
mg/L
200.8 200.7 200.7 200.8 200.7 200.7 200.8 200.7200.7
2 NE 10 1*1 300 15 NE700
µg/Lµg/L µg/L mg/L µg/L µg/L mg/L µg/L
Cadmium Calcium Chromium Cobalt Copper Iron
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.000 N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.000 N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.000 N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.000 N/A N/A N/A N/A N/A N/A
353 361 <1 <5 4.66 22.2 7.6 <5 18 N/A N/A <0.005 0.016 0.000 184 11200 <1 31.3 3.59 17.2
N/A 337 N/A <1 N/A 6.94 6.6 N/A <5 N/A N/A N/A <0.005 0.000 N/A 50 N/A <1 N/A 5.52
350 331 <1 <1 6.29 6.26 6.7 <5 <5 N/A N/A <0.005 <0.005 0.000 21 283 <1 <1 4.99 5.07
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.000 N/A N/A N/A N/A N/A N/A
N/A 227 N/A <0.5 N/A 27.6 7.7 N/A 1.89 N/A N/A N/A <0.002 0.110 N/A 23 N/A <2 N/A 13.4
N/A 213 N/A <1 N/A 25.8 7.9 N/A 2.05 N/A N/A N/A 0.009 <0.1 N/A <10 N/A <1 N/A 12.7
N/A 258 N/A <1 N/A 26.8 7.8 N/A 2.1 N/A N/A N/A <0.001 0.110 N/A 12 N/A <1 N/A 13.4
N/A 263 N/A <1 N/A 0 8.1 N/A 2.3 N/A N/A N/A 0.002 <0.1 N/A 11.5 N/A <1 N/A 12.9
345 337 <1 <1 25.3 24.7 7.2 <5 <5 N/A N/A <0.005 <0.005 0.000 13 208 <1 <1 12.5 12.3
N/A 357 N/A <1 N/A 25.9 7.4 N/A <5 N/A N/A N/A <0.005 0.000 N/A 129 N/A <1 N/A 12.3
388 384 <1 <1 25.4 26 7.4 <5 <5 N/A N/A <0.005 <0.005 0.000 <10 41 <1 <1 12.4 12.8
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 0.000 N/A N/A N/A N/A N/A N/A
N/A 172 N/A <0.5 N/A 0.425 9.5 N/A <1 N/A N/A N/A <0.002 <0.1 N/A 87 N/A <2 N/A 0.423
N/A 149 N/A <1 N/A 0.381 9.4 N/A <1 N/A N/A N/A <0.001 <0.1 N/A 63 N/A <1 N/A 0.428
N/A 159 N/A <1 N/A 0.446 9 N/A <1 N/A N/A N/A <0.001 <0.1 N/A 28.4 N/A <1 N/A 0.529
N/A 138 N/A <1 N/A 0.466 8.1 N/A <1 N/A N/A N/A 0.001 <0.1 N/A 30.7 N/A <1 N/A 0.576
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.000 N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.000 N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.000 N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.000 N/A N/A N/A N/A N/A N/A
310 336 <1 <1 0.954 0.888 8.1 <5 <5 N/A N/A <0.005 <0.005 0.000 53 155 <1 <1 0.842 0.797
N/A 421 N/A <1 N/A 0.832 8.6 N/A <5 N/A N/A N/A <0.005 0.000 N/A 371 N/A <1 N/A 0.763
451 470 <1 <1 0.837 0.837 8.3 <5 <5 N/A N/A <0.005 <0.005 0.000 70 551 <1 <1 0.764 0.79
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.000 N/A N/A N/A N/A N/A N/A
N/A 307 N/A <0.5 N/A 15 5.8 N/A <1 N/A N/A N/A <0.002 <0.1 N/A 75 N/A <2 N/A 7.05
N/A 270 N/A <1 N/A 14 6 N/A <1 N/A N/A N/A 0.002 <0.1 N/A 39 N/A <1 N/A 6.61
N/A 319 N/A <1 N/A 14.8 6.1 N/A <1 N/A N/A N/A <0.001 <0.1 N/A 70 N/A <1 N/A 7.02
N/A 298 N/A <1 N/A 14.2 6.8 N/A <1 N/A N/A N/A 0.001 <0.1 N/A 53.4 N/A <1 N/A 6.66
N/A 214 N/A <0.5 N/A 11.2 5.3 N/A 1.53 N/A N/A N/A <0.002 0.190 N/A 1230 N/A <2 N/A 6.73
N/A 194 N/A <1 N/A 10.4 5.4 N/A 1.36 N/A N/A N/A <0.001 0.220 N/A 167 N/A <1 N/A 6.22
N/A 236 N/A <1 N/A 10.8 5.3 N/A <1 N/A N/A N/A <0.001 0.210 N/A 328 N/A <1 N/A 6.46
N/A 233 N/A <1 N/A 10.7 6.4 N/A <1 N/A N/A N/A <0.001 0.100 N/A 144 N/A <1 N/A 6.32
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 0.000 N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.000 N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.000 N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.000 N/A N/A N/A N/A N/A N/A
N/A <100 N/A <0.5 N/A 2.46 1.1 N/A <1 N/A N/A N/A <0.002 <0.1 N/A 11 N/A <2 N/A 0.938
N/A <100 N/A <1 N/A 2.36 1.2 N/A <1 N/A N/A N/A <0.001 <0.1 N/A 10 N/A <1 N/A 0.894
N/A <50 N/A <1 N/A 2.46 1.3 N/A <1 N/A N/A N/A <0.001 <0.1 N/A <10 N/A <1 N/A 0.914
N/A <50 N/A <1 N/A 2.52 1.5 N/A <1 N/A N/A N/A 0.001 <0.1 N/A <10 N/A <1 N/A 0.937
N/A <50 N/A <1 N/A N/A 1.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A <10 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 1.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A <10 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 1.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A <10 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 1 N/A <5 N/A N/A N/A <0.005 0.000 N/A <10 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A <1 N/A <5 N/A N/A N/A <0.005 0.000 N/A <10 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 1.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A <10 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 1.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A <10 N/A <1 N/A N/A
<50 <50 <1 <1 2.46 2.43 1.1 <5 <5 N/A N/A <0.005 <0.005 0.000 <10 <10 <1 <1 0.903 0.898
N/A <50 N/A <1 N/A 2.53 1.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A <10 N/A <1 N/A 0.919
N/A <50 N/A <1 N/A 2.49 1.1 N/A <5 N/A N/A N/A <0.005 0.000 N/A <10 N/A <1 N/A 0.923
<50 <50 <1 <1 2.38 2.44 1.3 <5 <5 N/A N/A <0.005 <0.005 0.000 <10 <10 <1 <1 0.894 0.927
N/A <50 N/A <1 N/A 2.51 1.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A <10 N/A <1 N/A 0.906
N/A <50 N/A <1 N/A N/A 2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 125 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 790 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 495 N/A <1 N/A N/A
Tables - Page 12
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection Date
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
Analytical Parameter
MW-7SR Upgradient Residuum 10/4/2011
MW-7SR Upgradient Residuum 2/22/2012
MW-7SR Upgradient Residuum 6/5/2012
MW-7SR Upgradient Residuum 10/3/2012
MW-7SR Upgradient Residuum 2/4/2013
MW-7SR Upgradient Residuum 6/3/2013
MW-7SR Upgradient Residuum 10/14/2013
MW-7SR Upgradient Residuum 2/5/2014
MW-7SR Upgradient Residuum 6/2/2014
MW-8D Compliance Transition (Saprolite)12/6/2010
MW-8D Compliance Transition (Saprolite)2/1/2011
MW-8D Compliance Transition (Saprolite)6/7/2011
MW-8D Compliance Transition (Saprolite)10/3/2011
MW-8D Compliance Transition (Saprolite)2/6/2012
MW-8D Compliance Transition (Saprolite)6/4/2012
MW-8D Compliance Transition (Saprolite)10/3/2012
MW-8D Compliance Transition (Saprolite)2/4/2013
MW-8D Compliance Transition (Saprolite)6/3/2013
MW-8D Compliance Transition (Saprolite)10/14/2013
MW-8D Compliance Transition (Saprolite)2/4/2014
MW-8D Compliance Transition (Saprolite)6/2/2014
MW-8I Compliance Residuum 12/6/2010
MW-8I Compliance Residuum 2/1/2011
MW-8I Compliance Residuum 6/7/2011
MW-8I Compliance Residuum 10/3/2011
MW-8I Compliance Residuum 2/6/2012
MW-8I Compliance Residuum 6/4/2012
MW-8I Compliance Residuum 10/3/2012
MW-8I Compliance Residuum 2/4/2013
MW-8I Compliance Residuum 6/3/2013
MW-8I Compliance Residuum 10/14/2013
MW-8I Compliance Residuum 2/4/2014
MW-8I Compliance Residuum 6/2/2014
MW-8S Compliance Residuum 12/6/2010
MW-8S Compliance Residuum 2/1/2011
MW-8S Compliance Residuum 6/7/2011
MW-8S Compliance Residuum 10/3/2011
MW-8S Compliance Residuum 2/6/2012
MW-8S Compliance Residuum 6/4/2012
MW-8S Compliance Residuum 10/3/2012
MW-8S Compliance Residuum 2/4/2013
MW-8S Compliance Residuum 6/3/2013
MW-8S Compliance Residuum 10/14/2013
MW-8S Compliance Residuum 2/4/2014
MW-8S Compliance Residuum 6/2/2014
MW-9 Compliance Residuum 12/6/2010
MW-9 Compliance Residuum 2/1/2011
MW-9 Compliance Residuum 6/6/2011
MW-9 Compliance Residuum 10/4/2011
MW-9 Compliance Residuum 2/6/2012
MW-9 Compliance Residuum 6/5/2012
MW-9 Compliance Residuum 10/3/2012
MW-9 Compliance Residuum 2/4/2013
MW-9 Compliance Residuum 6/4/2013
MW-9 Compliance Residuum 10/15/2013
MW-9 Compliance Residuum 2/5/2014
MW-9 Compliance Residuum 6/2/2014
Chloride Flouride
mg/L mg/L
250 2
300
Dissolved Total Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total
Lead MagnesiumBoron
mg/L
200.8 200.7 200.7 200.8 200.7 200.7 200.8 200.7200.7
2 NE 10 1*1 300 15 NE700
µg/Lµg/L µg/L mg/L µg/L µg/L mg/L µg/L
Cadmium Calcium Chromium Cobalt Copper Iron
N/A <50 N/A <1 N/A N/A 1.9 N/A <5 N/A N/A N/A <0.005 0.000 N/A 532 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 2.1 N/A <5 N/A N/A N/A <0.005 0.000 N/A 285 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 1.9 N/A <5 N/A N/A N/A <0.005 0.000 N/A 520 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 1.8 N/A <5 N/A N/A N/A <0.005 0.000 N/A 221 N/A <1 N/A N/A
<50 <50 <1 <1 0.311 0.312 1.8 <5 <5 N/A N/A <0.005 <0.005 0.000 132 158 <1 <1 1.05 1.07
N/A <50 N/A <1 N/A 0.291 1.9 N/A <5 N/A N/A N/A <0.005 0.000 N/A 155 N/A <1 N/A 1.02
N/A <50 N/A <1 N/A 0.295 1.9 N/A <5 N/A N/A N/A <0.005 0.000 N/A 445 N/A <1 N/A 1.05
<50 <50 <1 <1 0.261 0.25 2 <5 <5 N/A N/A <0.005 <0.005 0.000 119 166 <1 <1 0.99 0.959
N/A <50 N/A <1 N/A 0.268 1.9 N/A <5 N/A N/A N/A <0.005 0.000 N/A 117 N/A <1 N/A 0.963
N/A <50 N/A <1 N/A N/A 2.5 N/A <5 N/A N/A N/A <0.005 0.000 N/A 2640 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 1330 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 1.3 N/A <5 N/A N/A N/A <0.005 0.000 N/A 777 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 1.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 954 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 1.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 1480 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 1.3 N/A <5 N/A N/A N/A <0.005 0.000 N/A 1320 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 1.2 N/A 5 N/A N/A N/A <0.005 0.000 N/A 2050 N/A <1 N/A N/A
<50 <50 <1 <1 4.55 5.58 1.3 <5 <5 N/A N/A <0.005 <0.005 0.000 71 1720 <1 <1 0.822 1.34
N/A <50 N/A <1 N/A 4.44 1.3 N/A <5 N/A N/A N/A <0.005 0.000 N/A 1680 N/A <1 N/A 1.05
N/A <50 N/A <1 N/A 3.67 1.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 948 N/A <1 N/A 0.821
<50 <50 <1 <1 3.79 5.38 1.3 <5 6 N/A N/A <0.005 <0.005 0.000 36 4160 <1 <1 0.696 1.75
N/A <50 N/A <1 N/A 4.49 1.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 2410 N/A <1 N/A 1.24
N/A <50 N/A <1 N/A N/A 1.4 N/A <5 N/A N/A N/A <0.005 0.000 N/A 787 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 1.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 643 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 1.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 812 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 1.1 N/A <5 N/A N/A N/A <0.005 0.000 N/A 942 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 1.1 N/A <5 N/A N/A N/A <0.005 0.000 N/A 976 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 1.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 853 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 1.1 N/A <5 N/A N/A N/A <0.005 0.000 N/A 618 N/A <1 N/A N/A
<50 <50 <1 <1 2.11 2.3 1.1 <5 <5 N/A N/A <0.005 <0.005 0.000 38 497 <1 <1 0.458 0.692
N/A <50 N/A <1 N/A 2.23 1.1 N/A <5 N/A N/A N/A <0.005 0.000 N/A 593 N/A <1 N/A 0.62
N/A <50 N/A <1 N/A 2.15 1.1 N/A <5 N/A N/A N/A <0.005 0.000 N/A 436 N/A <1 N/A 0.584
<50 <50 <1 <1 2.08 2.11 1.2 <5 <5 N/A N/A <0.005 <0.005 0.000 44 618 <1 <1 0.472 0.639
N/A <50 N/A <1 N/A 2.11 1.1 N/A <5 N/A N/A N/A <0.005 0.000 N/A 629 N/A <1 N/A 0.622
N/A <50 N/A <1 N/A N/A 2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 53 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 2.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 41 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 2.7 N/A <5 N/A N/A N/A <0.005 0.000 N/A 73 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 2.1 N/A <5 N/A N/A N/A <0.005 0.000 N/A 16 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 2.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 58 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 3 N/A <5 N/A N/A N/A <0.005 0.000 N/A 24 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 2.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 19 N/A <1 N/A N/A
<50 <50 <1 <1 0.334 0.318 2 <5 <5 N/A N/A <0.005 <0.005 0.000 <10 12 <1 <1 0.252 0.25
N/A <50 N/A <1 N/A 0.352 2.7 N/A <5 N/A N/A N/A <0.005 0.000 N/A 71 N/A <1 N/A 0.276
N/A <50 N/A <1 N/A 0.342 3 N/A <5 N/A N/A N/A <0.005 0.000 N/A 68 N/A <1 N/A 0.275
<50 <50 <1 <1 0.29 0.287 2.5 <5 <5 N/A N/A <0.005 <0.005 0.000 <10 90 <1 <1 0.267 0.285
N/A <50 N/A <1 N/A 0.4 3.3 N/A <5 N/A N/A N/A <0.005 0.000 N/A 23 N/A <1 N/A 0.283
N/A <50 N/A <1 N/A N/A 2.3 N/A <5 N/A N/A N/A <0.005 0.000 N/A 2440 N/A 1.87 N/A N/A
N/A <50 N/A <1 N/A N/A 2.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 1110 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 2.3 N/A <5 N/A N/A N/A <0.005 0.000 N/A 1060 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 2.1 N/A <5 N/A N/A N/A <0.005 0.000 N/A 464 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 2.3 N/A <5 N/A N/A N/A <0.005 0.000 N/A 1870 N/A 1.23 N/A N/A
N/A <50 N/A <1 N/A N/A 2.4 N/A <5 N/A N/A N/A <0.005 0.000 N/A 381 N/A <1 N/A N/A
N/A <50 N/A <1 N/A N/A 2.2 N/A <5 N/A N/A N/A <0.005 0.000 N/A 569 N/A <1 N/A N/A
<50 <50 <1 <1 13.7 13.9 2.4 <5 <5 N/A N/A <0.005 <0.005 0.000 13 1950 <1 1.12 3.73 3.93
N/A <50 N/A <1 N/A 14.7 2.5 N/A <5 N/A N/A N/A <0.005 0.000 N/A 1130 N/A <1 N/A 4.03
N/A <50 N/A <1 N/A 14.6 2.5 N/A <5 N/A N/A N/A <0.005 0.000 N/A 341 N/A <1 N/A 3.99
<50 <50 <1 <1 14.8 15.2 2.6 <5 <5 N/A N/A <0.005 <0.005 0.000 19 263 <1 <1 3.98 4.16
N/A <50 N/A <1 N/A 15.2 2.5 N/A <5 N/A N/A N/A <0.005 0.000 N/A 272 N/A <1 N/A 4.14
Tables - Page 13
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection Date
MW-10 Compliance Residuum 12/6/2010
MW-10 Compliance Residuum 2/1/2011
MW-10 Compliance Residuum 6/7/2011
MW-10 Compliance Residuum 10/3/2011
MW-10 Compliance Residuum 2/6/2012
MW-10 Compliance Residuum 6/4/2012
MW-10 Compliance Residuum 10/3/2012
MW-10 Compliance Residuum 2/4/2013
MW-10 Compliance Residuum 6/4/2013
MW-10 Compliance Residuum 10/15/2013
MW-10 Compliance Residuum 2/3/2014
MW-10 Compliance Residuum 6/2/2014
MW-11DR Compliance Bedrock 2/1/2011
MW-11DR Compliance Bedrock 6/6/2011
MW-11DR Compliance Bedrock 10/3/2011
MW-11DR Compliance Bedrock 2/6/2012
MW-11DR Compliance Bedrock 6/4/2012
MW-11DR Compliance Bedrock 10/3/2012
MW-11DR Compliance Bedrock 2/4/2013
MW-11DR Compliance Bedrock 6/3/2013
MW-11DR Compliance Bedrock 10/14/2013
MW-11DR Compliance Bedrock 2/3/2014
MW-11DR Compliance Bedrock 6/2/2014
MW-11SR Compliance Residuum 2/1/2011
MW-11SR Compliance Residuum 6/6/2011
MW-11SR Compliance Residuum 10/3/2011
MW-11SR Compliance Residuum 2/6/2012
MW-11SR Compliance Residuum 6/4/2012
MW-11SR Compliance Residuum 10/3/2012
MW-11SR Compliance Residuum 2/4/2013
MW-11SR Compliance Residuum 6/3/2013
MW-11SR Compliance Residuum 10/14/2013
MW-11SR Compliance Residuum 2/3/2014
MW-11SR Compliance Residuum 6/2/2014
MW-12 Compliance Residuum 12/6/2010
MW-12 Compliance Residuum 2/1/2011
MW-13 Compliance Residuum 12/6/2010
MW-13 Compliance Residuum 2/1/2011
MW-13 Compliance Residuum 6/7/2011
MW-13 Compliance Residuum 10/4/2011
MW-13 Compliance Residuum 2/6/2012
MW-13 Compliance Residuum 6/5/2012
MW-13 Compliance Residuum 10/3/2012
MW-13 Compliance Residuum 2/5/2013
MW-13 Compliance Residuum 6/3/2013
MW-13 Compliance Residuum 10/15/2013
MW-13 Compliance Residuum 2/3/2014
MW-13 Compliance Residuum 6/2/2014
MW-14 Compliance Residuum 12/6/2010
MW-14 Compliance Residuum 2/1/2011
MW-14 Compliance Residuum 6/7/2011
MW-14 Compliance Residuum 10/4/2011
MW-14 Compliance Residuum 2/6/2012
MW-14 Compliance Residuum 6/5/2012
MW-14 Compliance Residuum 10/3/2012
MW-14 Compliance Residuum 2/4/2013
MW-14 Compliance Residuum 6/3/2013
MW-14 Compliance Residuum 10/15/2013
MW-14 Compliance Residuum 2/3/2014
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
Analytical Parameter Nitrate as N Strontium Sulfate TDS
mg-N/L N/A mg/L mg/L
10 NE 250 500
300.0 N/A 300.0 2540C
Dissolved Total Dissolved Total Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Total Total Total Dissolved Total
N/A 198 N/A <0.05 N/A N/A N/A <5 0.2 N/A N/A N/A <1 N/A N/A N/A 12 78 N/A <0.2
N/A 242 N/A <0.05 N/A N/A N/A <5 <0.1 N/A N/A N/A <1 N/A N/A N/A 19 90 N/A <0.2
N/A 72 N/A <0.05 N/A N/A N/A <5 0.04 N/A N/A N/A <1 N/A N/A N/A 12 74 N/A <0.2
N/A 355 N/A <0.05 N/A N/A N/A <5 0.03 N/A N/A N/A <1 N/A N/A N/A 35 85 N/A <0.2
N/A 67 N/A <0.05 N/A N/A N/A <5 0.04 N/A N/A N/A <1 N/A N/A N/A 11 62 N/A <0.2
N/A 48 N/A <0.05 N/A N/A N/A <5 0.04 N/A N/A N/A <1 N/A N/A N/A 14 61 N/A <0.2
N/A 232 N/A <0.05 N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 40 97 N/A <0.2
36 33 N/A <0.05 N/A N/A <5 <5 0.05 0.353 0.401 <1 <1 5.95 6.28 N/A 21 73 <0.2 <0.2
N/A 21 N/A <0.05 N/A N/A N/A <5 0.05 N/A 0.41 N/A <1 N/A 5.45 N/A 11 58 N/A <0.2
N/A 133 N/A <0.05 N/A N/A N/A <5 0.03 N/A 0.506 N/A <1 N/A 8.06 N/A 38 95 N/A <0.2
15 19 N/A <0.05 N/A N/A <5 <5 0.04 0.32 0.362 <1 <1 5.93 5.82 N/A 18 92 <0.2 <0.2
N/A 37 N/A <0.05 N/A N/A N/A <5 0.04 N/A 0.452 N/A <1 N/A 5.32 N/A 16 72 N/A <0.2
N/A 168 N/A <0.05 N/A N/A N/A <5 0.16 N/A N/A N/A <1 N/A N/A N/A 44 120 N/A <0.2
N/A 103 N/A <0.05 N/A N/A N/A <5 0.21 N/A N/A N/A <1 N/A N/A N/A 45 120 N/A <0.2
N/A 87 N/A <0.05 N/A N/A N/A <5 0.2 N/A N/A N/A <1 N/A N/A N/A 42 98 N/A <0.2
N/A 101 N/A <0.05 N/A N/A N/A <5 0.17 N/A N/A N/A <1 N/A N/A N/A 45 110 N/A <0.2
N/A 92 N/A <0.05 N/A N/A N/A <5 0.19 N/A N/A N/A <1 N/A N/A N/A 44 112 N/A <0.2
N/A 87 N/A <0.05 N/A N/A N/A <5 0.18 N/A N/A N/A <1 N/A N/A N/A 42 100 N/A <0.2
89 88 N/A <0.05 N/A N/A <5 <5 0.17 2.11 2.08 <1 <1 7.33 7.22 N/A 43 110 <0.2 <0.2
N/A 93 N/A <0.05 N/A N/A N/A <5 0.18 N/A 2.3 N/A <1 N/A 7.91 N/A 44 120 N/A <0.2
N/A 60 N/A <0.05 N/A N/A N/A <5 0.19 N/A 2.17 N/A <1 N/A 7.3 N/A 43 110 N/A <0.2
51 51 N/A <0.05 N/A N/A <5 <5 0.18 2.17 2.15 <1 <1 7.35 7.25 N/A 40 150 <0.2 <0.2
N/A 51 N/A <0.05 N/A N/A N/A <5 0.19 N/A 2.06 N/A <1 N/A 7.09 N/A 41 110 N/A <0.2
N/A 384 N/A <0.05 N/A N/A N/A <5 0.13 N/A N/A N/A <1 N/A N/A N/A 45 130 N/A <0.2
N/A 59 N/A <0.05 N/A N/A N/A <5 0.18 N/A N/A N/A <1 N/A N/A N/A 47 130 N/A <0.2
N/A 30 N/A <0.05 N/A N/A N/A <5 0.18 N/A N/A N/A <1 N/A N/A N/A 45 100 N/A <0.2
N/A 24 N/A <0.05 N/A N/A N/A <5 0.15 N/A N/A N/A <1 N/A N/A N/A 46 110 N/A <0.2
N/A 17 N/A <0.05 N/A N/A N/A <5 0.16 N/A N/A N/A <1 N/A N/A N/A 45 113 N/A <0.2
N/A 16 N/A <0.05 N/A N/A N/A <5 0.16 N/A N/A N/A <1 N/A N/A N/A 43 110 N/A <0.2
12 12 N/A <0.05 N/A N/A <5 <5 0.16 1.64 1.62 <1 <1 8.16 8.03 N/A 44 110 <0.2 <0.2
N/A 12 N/A <0.05 N/A N/A N/A <5 0.16 N/A 1.68 N/A <1 N/A 8.14 N/A 44 130 N/A <0.2
N/A 14 N/A <0.05 N/A N/A N/A <5 0.17 N/A 1.69 N/A <1 N/A 7.94 N/A 43 110 N/A <0.2
8 8 N/A <0.05 N/A N/A <5 <5 0.16 1.72 1.71 <1 <1 7.97 7.92 N/A 41 130 <0.2 <0.2
N/A 9 N/A <0.05 N/A N/A N/A <5 0.17 N/A 1.66 N/A <1 N/A 7.7 N/A 41 110 N/A <0.2
N/A 211 N/A <0.05 N/A N/A N/A <5 1 N/A N/A N/A <1 N/A N/A N/A 42 120 N/A <0.2
N/A 144 N/A <0.05 N/A N/A N/A <5 0.24 N/A N/A N/A <1 N/A N/A N/A 42 140 N/A <0.2
N/A 10900 N/A <0.05 N/A N/A N/A <5 <0.1 N/A N/A N/A <1 N/A N/A N/A 17 120 N/A <0.2
N/A 11200 N/A <0.05 N/A N/A N/A <5 <0.1 N/A N/A N/A <1 N/A N/A N/A 17 110 N/A <0.2
N/A 10400 N/A <0.05 N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 16 120 N/A <0.2
N/A 10000 N/A <0.05 N/A N/A N/A <5 0.06 N/A N/A N/A <1 N/A N/A N/A 15 110 N/A <0.2
N/A 10300 N/A <0.05 N/A N/A N/A <5 0.16 N/A N/A N/A <1 N/A N/A N/A 17 120 N/A <0.2
N/A 10300 N/A <0.05 N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 15 111 N/A <0.2
N/A 10300 N/A <0.05 N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 14 110 N/A <0.2
10400 10500 N/A <0.05 N/A N/A <5 <5 <0.023 0.458 0.458 <1 <1 3.07 3.08 N/A 14 130 <0.2 <0.2
N/A 10100 N/A <0.05 N/A N/A N/A <5 <0.023 N/A 0.579 N/A <1 N/A 3.59 N/A 16 110 N/A <0.2
N/A 8070 N/A <0.05 N/A N/A N/A <5 0.07 N/A 0.532 N/A <1 N/A 3.56 N/A 17 91 N/A <0.2
10500 10300 N/A <0.05 N/A N/A 9 11 <0.023 1.72 1.82 <1 <1 6.93 7.07 N/A 29 240 <0.2 <0.2
N/A 10000 N/A <0.05 N/A N/A N/A <5 <0.023 N/A 0.425 N/A <1 N/A 3.45 N/A 15 130 N/A <0.2
N/A 270 N/A <0.05 N/A N/A N/A 6 0.35 N/A N/A N/A <1 N/A N/A N/A 32 140 N/A <0.2
N/A 55 N/A <0.05 N/A N/A N/A <5 <0.1 N/A N/A N/A <1 N/A N/A N/A 30 140 N/A <0.2
N/A 43 N/A <0.05 N/A N/A N/A <5 0.06 N/A N/A N/A <1 N/A N/A N/A 36 180 N/A <0.2
N/A 193 N/A <0.05 N/A N/A N/A <5 0.09 N/A N/A N/A <1 N/A N/A N/A 29 120 N/A <0.2
N/A 353 N/A <0.05 N/A N/A N/A 9 0.06 N/A N/A N/A <1 N/A N/A N/A 35 150 N/A <0.2
N/A 56 N/A <0.05 N/A N/A N/A <5 0.07 N/A N/A N/A <1 N/A N/A N/A 32 148 N/A <0.2
N/A 20 N/A <0.05 N/A N/A N/A <5 0.08 N/A N/A N/A <1 N/A N/A N/A 31 150 N/A <0.2
<5 18 N/A <0.05 N/A N/A <5 <5 0.07 0.192 0.215 <1 <1 2.58 2.65 N/A 35 150 <0.2 <0.2
N/A 63 N/A <0.05 N/A N/A N/A <5 <0.023 N/A 0.213 N/A <1 N/A 3.47 N/A 27 140 N/A <0.2
N/A 81 N/A <0.05 N/A N/A N/A <5 <0.023 N/A 0.196 N/A <1 N/A 3.35 N/A 27 140 N/A <0.2
<5 205 N/A <0.05 N/A N/A <5 <5 <0.023 0.158 0.222 <1 <1 3.63 3.49 N/A 30 180 <0.2 <0.2
Manganese Mercury
200.7 200.8 200.7 200.8
NE 20 NE 0.2*
Potassium Selenium Sodium Thallium
mg/L µg/L mg/L µg/L
200.8 200.7200.8 245.1
100501NE
µg/L µg/L µg/L µg/L
Molybdenum Nickel
Tables - Page 14
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection Date
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
Analytical Parameter
MW-14 Compliance Residuum 6/2/2014
MW-15 Compliance Residuum 2/23/2011
MW-15 Compliance Residuum 6/6/2011
MW-15 Compliance Residuum 10/3/2011
MW-15 Compliance Residuum 2/6/2012
MW-15 Compliance Residuum 6/5/2012
MW-15 Compliance Residuum 10/3/2012
MW-15 Compliance Residuum 2/4/2013
MW-15 Compliance Residuum 6/3/2013
MW-15 Compliance Residuum 10/14/2013
MW-15 Compliance Residuum 2/3/2014
MW-15 Compliance Residuum 6/2/2014
MW-1D Voluntary Not Reported 12/16/2008
MW-1D Voluntary Not Reported 6/22/2009
MW-1D Voluntary Not Reported 12/14/2009
MW-1D Voluntary Not Reported 6/28/2010
MW-1S Voluntary Not Reported 12/16/2008
MW-1S Voluntary Not Reported 6/22/2009
MW-1S Voluntary Not Reported 12/14/2009
MW-1S Voluntary Not Reported 6/28/2010
MW-1S Voluntary Not Reported 12/6/2010
MW-1S Voluntary Not Reported 2/1/2011
MW-1S Voluntary Not Reported 6/7/2011
MW-2D Voluntary Not Reported 12/16/2008
MW-2D Voluntary Not Reported 6/22/2009
MW-2D Voluntary Not Reported 12/14/2009
MW-2D Voluntary Not Reported 6/28/2010
MW-2S Voluntary Not Reported 12/16/2008
MW-2S Voluntary Not Reported 6/22/2009
MW-2S Voluntary Not Reported 12/14/2009
MW-2S Voluntary Not Reported 6/28/2010
MW-2S Voluntary Not Reported 12/6/2010
MW-2S Voluntary Not Reported 2/1/2011
MW-2S Voluntary Not Reported 6/7/2011
MW-2S Voluntary Not Reported 10/3/2011
MW-3D Voluntary Not Reported 12/16/2008
MW-3D Voluntary Not Reported 6/22/2009
MW-3D Voluntary Not Reported 12/14/2009
MW-3D Voluntary Not Reported 6/28/2010
MW-3S Voluntary Not Reported 12/16/2008
MW-3S Voluntary Not Reported 6/22/2009
MW-3S Voluntary Not Reported 12/14/2009
MW-3S Voluntary Not Reported 6/28/2010
MW-3S Voluntary Not Reported 12/6/2010
MW-3S Voluntary Not Reported 2/1/2011
MW-3S Voluntary Not Reported 6/7/2011
MW-3S Voluntary Not Reported 10/4/2011
MW-4D Voluntary Not Reported 12/16/2008
MW-4D Voluntary Not Reported 6/22/2009
MW-4D Voluntary Not Reported 12/14/2009
MW-4D Voluntary Not Reported 6/28/2010
MW-4D Voluntary Not Reported 2/5/2013
MW-4D Voluntary Not Reported 10/15/2013
MW-4D Voluntary Not Reported 2/4/2014
MW-4D Voluntary Not Reported 6/3/2014
MW-4S Voluntary Not Reported 12/16/2008
MW-4S Voluntary Not Reported 6/22/2009
MW-4S Voluntary Not Reported 12/14/2009
MW-4S Voluntary Not Reported 6/28/2010
Nitrate as N Strontium Sulfate TDS
mg-N/L N/A mg/L mg/L
10 NE 250 500
300.0 N/A 300.0 2540C
Dissolved Total Dissolved Total Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Total Total Total Dissolved Total
Manganese Mercury
200.7 200.8 200.7 200.8
NE 20 NE 0.2*
Potassium Selenium Sodium Thallium
mg/L µg/L mg/L µg/L
200.8 200.7200.8 245.1
100501NE
µg/L µg/L µg/L µg/L
Molybdenum Nickel
N/A 185 N/A <0.05 N/A N/A N/A 6 <0.023 N/A 0.184 N/A <1 N/A 3.21 N/A 27 140 N/A <0.2
N/A 55 N/A <0.05 N/A N/A N/A <5 0.23 N/A N/A N/A 1.98 N/A N/A N/A 29 84 N/A <0.2
N/A 64 N/A <0.05 N/A N/A N/A <5 0.19 N/A N/A N/A 1.79 N/A N/A N/A 33 110 N/A <0.2
N/A 81 N/A <0.05 N/A N/A N/A <5 0.18 N/A N/A N/A 1.97 N/A N/A N/A 28 75 N/A <0.2
N/A 86 N/A <0.05 N/A N/A N/A <5 0.14 N/A N/A N/A 1.91 N/A N/A N/A 26 84 N/A <0.2
N/A 52 N/A <0.05 N/A N/A N/A <5 0.15 N/A N/A N/A 2.03 N/A N/A N/A 30 77 N/A <0.2
N/A 46 N/A <0.05 N/A N/A N/A <5 0.13 N/A N/A N/A 2.08 N/A N/A N/A 28 77 N/A <0.2
49 49 N/A <0.05 N/A N/A <5 <5 0.11 1.22 1.22 1.91 1.93 9.4 9.41 N/A 27 81 <0.2 <0.2
N/A 45 N/A <0.05 N/A N/A N/A <5 0.09 N/A 1.33 N/A 1.58 N/A 9.89 N/A 28 81 N/A <0.2
N/A 58 N/A <0.05 N/A N/A N/A <5 0.11 N/A 1.31 N/A 1.83 N/A 9.46 N/A 29 81 N/A <0.2
47 50 N/A <0.05 N/A N/A <5 <5 0.07 1.26 1.27 1.69 1.58 9.55 9.56 N/A 27 120 <0.2 <0.2
N/A 41 N/A <0.05 N/A N/A N/A <5 0.05 N/A 1.27 N/A 1.7 N/A 9.26 N/A 28 83 N/A <0.2
N/A 439 N/A <0.05 N/A N/A N/A 4.92 0.03 N/A 1.87 N/A <2 N/A 9.29 N/A 95 224 N/A N/A
N/A 433 N/A <0.05 N/A N/A N/A 5.48 <0.02 N/A 1.72 N/A <1 N/A 8.73 N/A 110 302 N/A N/A
N/A 476 N/A <0.05 N/A N/A N/A 5.4 <0.02 N/A 1.91 N/A <1 N/A 9.56 N/A 95 194 N/A N/A
N/A 478 N/A <0.05 N/A N/A N/A 5.4 <0.2 N/A 1.91 N/A <1 N/A 9.29 N/A 110 218 N/A N/A
N/A 3300 N/A <0.05 N/A N/A N/A <2 0.03 N/A 1.62 N/A <2 N/A 6.53 N/A 1.1 92 N/A N/A
N/A 2950 N/A <0.05 N/A N/A N/A <1 0.02 N/A 1.38 N/A <1 N/A 5.97 N/A 2.1 156 N/A N/A
N/A 3130 N/A <0.05 N/A N/A N/A <1 <0.02 N/A 1.58 N/A <1 N/A 6.65 N/A 3 <100 N/A N/A
N/A 2880 N/A <0.05 N/A N/A N/A <1 <0.2 N/A 1.47 N/A <1 N/A 6.17 N/A <1 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 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A 42 N/A <0.05 N/A N/A N/A <2 0.05 N/A 0.54 N/A <2 N/A 5.5 N/A 0.54 96 N/A N/A
N/A 27 N/A <0.05 N/A N/A N/A 1.01 <0.02 N/A 0.52 N/A <1 N/A 5.6 N/A 0.33 130 N/A N/A
N/A 27 N/A <0.05 N/A N/A N/A <1 <0.02 N/A 0.496 N/A <1 N/A 5.72 N/A 0.3 64 N/A N/A
N/A 15 N/A <0.05 N/A N/A N/A <1 <0.2 N/A 0.548 N/A <1 N/A 5.84 N/A 28 101 N/A N/A
N/A 258 N/A <0.05 N/A N/A N/A <2 0.16 N/A 6.07 N/A <2 N/A 7.94 N/A 45 98 N/A N/A
N/A 208 N/A <0.05 N/A N/A N/A 1.72 0.09 N/A 4.49 N/A <1 N/A 7.46 N/A 51 216 N/A N/A
N/A 218 N/A <0.05 N/A N/A N/A 1.7 0.07 N/A 5.67 N/A <1 N/A 8.03 N/A 42 64 N/A N/A
N/A 225 N/A <0.05 N/A N/A N/A 1.8 <0.2 N/A 4.98 N/A <1 N/A 7.51 N/A 49 91 N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A 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 <0.05 N/A N/A N/A <2 0.08 N/A 0.71 N/A <2 N/A 4.06 N/A 26 154 N/A N/A
N/A <5 N/A <0.05 N/A N/A N/A <1 0.06 N/A 0.65 N/A <1 N/A 3.76 N/A 34 156 N/A N/A
N/A <5 N/A <0.05 N/A N/A N/A <1 0.06 N/A 0.69 N/A <1 N/A 4.09 N/A 26 140 N/A N/A
N/A <5 N/A <0.05 N/A N/A N/A <1 <0.2 N/A 0.726 N/A <1 N/A 4.04 N/A 34 149 N/A N/A
N/A 991 N/A <0.05 N/A N/A N/A 2.15 0.04 N/A 0.66 N/A <2 N/A 5.26 N/A 33 128 N/A N/A
N/A 1750 N/A <0.05 N/A N/A N/A 2.86 <0.02 N/A 0.43 N/A <1 N/A 4.86 N/A 37 144 N/A N/A
N/A 1750 N/A <0.05 N/A N/A N/A 2 <0.02 N/A 0.475 N/A <1 N/A 5.1 N/A 31 132 N/A N/A
N/A 1890 N/A <0.05 N/A N/A N/A 2.4 <0.2 N/A 0.419 N/A <1 N/A 4.61 N/A <10 143 N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A 74 N/A 0.074 N/A N/A N/A <2 0.06 N/A 0.75 N/A <2 N/A 8.76 N/A 33 134 N/A N/A
N/A 60 N/A 0.052 N/A N/A N/A 2.04 0.06 N/A 0.63 N/A <1 N/A 8.05 N/A 40 112 N/A N/A
N/A 59.7 N/A 0.074 N/A N/A N/A 1.8 0.03 N/A 0.62 N/A <1 N/A 8.72 N/A 33 116 N/A N/A
N/A 64.9 N/A <0.05 N/A N/A N/A 2.8 <0.2 N/A 0.697 N/A <1 N/A 8.43 N/A 41 127 N/A N/A
32 48 N/A <0.05 N/A N/A <5 <5 0.04 0.484 0.567 <1 <1 8.01 8 N/A 33 130 <0.2 <0.2
N/A 34 N/A <0.05 N/A N/A N/A <5 0.04 N/A 0.562 N/A <1 N/A 8.16 N/A 35 120 N/A <0.2
27 36 N/A 0.06 N/A N/A <5 <5 0.04 0.52 0.615 <1 <1 8.07 8.13 N/A 34 120 <0.2 <0.2
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A 229 N/A <0.05 N/A N/A N/A <2 0.11 N/A 0.77 N/A <2 N/A 12.1 N/A 30 124 N/A N/A
N/A 187 N/A <0.05 N/A N/A N/A 1.91 0.16 N/A 0.82 N/A <1 N/A 5.97 N/A 33 106 N/A N/A
N/A 187 N/A <0.05 N/A N/A N/A 1.8 0.15 N/A 1.06 N/A <1 N/A 8.5 N/A 27 118 N/A N/A
N/A 199 N/A <0.05 N/A N/A N/A 1.3 <0.2 N/A 0.785 N/A <1 N/A 5.55 N/A 34 100 N/A N/A
Tables - Page 15
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection Date
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
Analytical Parameter
MW-4S Voluntary Not Reported 12/6/2010
MW-4S Voluntary Not Reported 2/1/2011
MW-4S Voluntary Not Reported 6/7/2011
MW-4S Voluntary Not Reported 10/4/2011
MW-4S Voluntary Not Reported 2/5/2013
MW-4S Voluntary Not Reported 10/15/2013
MW-4S Voluntary Not Reported 2/4/2014
MW-4S Voluntary Not Reported 6/3/2014
MW-5D Voluntary Not Reported 12/16/2008
MW-5D Voluntary Not Reported 6/22/2009
MW-5D Voluntary Not Reported 12/14/2009
MW-5D Voluntary Not Reported 6/28/2010
MW-5D Voluntary Not Reported 2/4/2013
MW-5D Voluntary Not Reported 10/15/2013
MW-5D Voluntary Not Reported 2/4/2014
MW-5D Voluntary Not Reported 6/3/2014
MW-5S Voluntary Not Reported 12/16/2008
MW-5S Voluntary Not Reported 6/22/2009
MW-5S Voluntary Not Reported 12/14/2009
MW-5S Voluntary Not Reported 6/28/2010
MW-5S Voluntary Not Reported 12/6/2010
MW-5S Voluntary Not Reported 2/1/2011
MW-5S Voluntary Not Reported 6/7/2011
MW-5S Voluntary Not Reported 10/4/2011
MW-5S Voluntary Not Reported 2/4/2013
MW-5S Voluntary Not Reported 10/15/2013
MW-5S Voluntary Not Reported 2/4/2014
MW-5S Voluntary Not Reported 6/3/2014
MW-6D Voluntary Not Reported 12/16/2008
MW-6D Voluntary Not Reported 6/22/2009
MW-6D Voluntary Not Reported 12/14/2009
MW-6D Voluntary Not Reported 6/28/2010
MW-6S Voluntary Not Reported 12/16/2008
MW-6S Voluntary Not Reported 6/22/2009
MW-6S Voluntary Not Reported 12/14/2009
MW-6S Voluntary Not Reported 6/28/2010
MW-6S Voluntary Not Reported 12/6/2010
MW-6S Voluntary Not Reported 2/1/2011
MW-6S Voluntary Not Reported 6/7/2011
MW-6S Voluntary Not Reported 10/4/2011
MW-7D Upgradient Not Reported 12/16/2008
MW-7D Upgradient Not Reported 6/22/2009
MW-7D Upgradient Not Reported 12/14/2009
MW-7D Upgradient Not Reported 6/28/2010
MW-7D Upgradient Not Reported 12/6/2010
MW-7D Upgradient Not Reported 2/2/2011
MW-7D Upgradient Not Reported 6/6/2011
MW-7D Upgradient Not Reported 10/4/2011
MW-7D Upgradient Not Reported 2/22/2012
MW-7D Upgradient Not Reported 6/5/2012
MW-7D Upgradient Not Reported 10/3/2012
MW-7D Upgradient Not Reported 2/4/2013
MW-7D Upgradient Not Reported 6/3/2013
MW-7D Upgradient Not Reported 10/14/2013
MW-7D Upgradient Not Reported 2/5/2014
MW-7D Upgradient Not Reported 6/2/2014
MW-7SR Upgradient Residuum 12/6/2010
MW-7SR Upgradient Residuum 2/2/2011
MW-7SR Upgradient Residuum 6/6/2011
Nitrate as N Strontium Sulfate TDS
mg-N/L N/A mg/L mg/L
10 NE 250 500
300.0 N/A 300.0 2540C
Dissolved Total Dissolved Total Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Total Total Total Dissolved Total
Manganese Mercury
200.7 200.8 200.7 200.8
NE 20 NE 0.2*
Potassium Selenium Sodium Thallium
mg/L µg/L mg/L µg/L
200.8 200.7200.8 245.1
100501NE
µg/L µg/L µg/L µg/L
Molybdenum Nickel
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
375 1750 N/A <0.5 N/A N/A <5 16 0.08 1.16 3.34 <1 5.62 14.9 16.9 N/A 44 1100 <0.2 <1
N/A 189 N/A <0.05 N/A N/A N/A <5 0.1 N/A 0.797 N/A <1 N/A 5.85 N/A 31 81 N/A <0.2
219 212 N/A <0.05 N/A N/A <5 <5 0.13 0.797 0.792 <1 <1 7.04 6.61 N/A 30 100 <0.2 <0.2
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A 49 N/A <0.05 N/A N/A N/A <2 0.15 N/A 1.24 N/A <2 N/A 8.19 N/A 50 224 N/A N/A
N/A 30 N/A <0.05 N/A N/A N/A <1 0.16 N/A 1.09 N/A <1 N/A 7.68 N/A 61 186 N/A N/A
N/A 26.9 N/A <0.05 N/A N/A N/A <1 0.14 N/A 1.12 N/A <1 N/A 8.15 N/A 51 196 N/A N/A
N/A 17 N/A <0.05 N/A N/A N/A <1 <0.2 N/A 1.14 N/A <1 N/A 8.02 N/A 64 200 N/A N/A
17 22 N/A <0.05 N/A N/A <5 <5 0.15 1.07 1.07 <1 <1 8.03 7.82 N/A 47 210 <0.2 <0.2
N/A 20 N/A <0.05 N/A N/A N/A <5 0.12 N/A 1.1 N/A <1 N/A 8.17 N/A 50 220 N/A <0.2
<5 <5 N/A <0.05 N/A N/A <5 <5 0.13 1.08 1.09 <1 <1 8.49 8.35 N/A 47 220 <0.2 <0.2
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A 44 N/A 0.058 N/A N/A N/A <2 0.08 N/A <0.25 N/A <2 N/A 9.35 N/A 3.4 74 N/A N/A
N/A 36 N/A 0.061 N/A N/A N/A <1 1.14 N/A <0.25 N/A <1 N/A 8.95 N/A 5.1 52 N/A N/A
N/A 54 N/A 0.161 N/A N/A N/A <1 0.13 N/A <0.1 N/A <1 N/A 8.5 N/A 3.6 62 N/A N/A
N/A 46.6 N/A 0.061 N/A N/A N/A <1 <0.2 N/A 0.147 N/A <1 N/A 8.1 N/A 31 48 N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
137 120 N/A 0.14 N/A N/A <5 <5 0.04 0.117 0.123 <1 <1 9.75 10.5 N/A 11 65 <0.2 <0.2
N/A 50 N/A 0.58 N/A N/A N/A <5 0.03 N/A 0.196 N/A <1 N/A 12.1 N/A 13 80 N/A <0.2
93 54 N/A 0.18 N/A N/A <5 <5 0.05 0.148 0.182 <1 <1 12.6 12.9 N/A 14 81 <0.2 <0.2
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A 8 N/A <0.05 N/A N/A N/A <2 0.03 N/A 0.82 N/A <2 N/A 6.49 N/A 35 126 N/A N/A
N/A 6 N/A <0.05 N/A N/A N/A <1 <0.02 N/A 0.78 N/A <1 N/A 6.03 N/A 44 134 N/A N/A
N/A 7 N/A <0.05 N/A N/A N/A <1 <0.02 N/A 0.8 N/A <1 N/A 6.53 N/A 36 130 N/A N/A
N/A 6.42 N/A <0.05 N/A N/A N/A <1 <0.2 N/A 0.833 N/A <1 N/A 6.32 N/A 38 113 N/A N/A
N/A 93 N/A <0.05 N/A N/A N/A <2 0.03 N/A 0.37 N/A <2 N/A 6.73 N/A 36 114 N/A N/A
N/A 53 N/A <0.05 N/A N/A N/A <1 <0.23 N/A 0.3 N/A <1 N/A 6.32 N/A 44 108 N/A N/A
N/A 66.3 N/A <0.05 N/A N/A N/A <1 <0.02 N/A 0.34 N/A <1 N/A 6.91 N/A 37 116 N/A N/A
N/A 57 N/A <0.05 N/A N/A N/A <1 <0.2 N/A 0.446 N/A <1 N/A 6.97 N/A 47 107 N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A 7 N/A <0.05 N/A N/A N/A <2 0.04 N/A 1.02 N/A <2 N/A 3.5 N/A 0.27 44 N/A N/A
N/A <5 N/A <0.05 N/A N/A N/A <1 <0.02 N/A 0.9 N/A <1 N/A 3.31 N/A 0.31 54 N/A N/A
N/A <5 N/A <0.05 N/A N/A N/A <1 <0.02 N/A 0.92 N/A <1 N/A 3.46 N/A 0.22 46 N/A N/A
N/A <5 N/A <0.05 N/A N/A N/A <1 <0.2 N/A 0.945 N/A <1 N/A 3.52 N/A <1 63 N/A N/A
N/A <5 N/A <0.05 N/A N/A N/A <5 <0.1 N/A N/A N/A <1 N/A N/A N/A 0.22 <50 N/A <0.2
N/A <5 N/A <0.05 N/A N/A N/A <5 <0.1 N/A N/A N/A <1 N/A N/A N/A 0.21 <50 N/A <0.2
N/A <5 N/A <0.05 N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 0.21 45 N/A <0.2
N/A <5 N/A <0.05 N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 0.22 27 N/A <0.2
N/A <5 N/A <0.05 N/A N/A N/A <5 <0.1 N/A N/A N/A <1 N/A N/A N/A <1 47 N/A <0.2
N/A <5 N/A <0.05 N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 0.19 40 N/A <0.2
N/A <5 N/A <0.05 N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 0.2 30 N/A <0.2
<5 <5 N/A <0.05 N/A N/A <5 <5 <0.023 0.948 0.949 <1 <1 3.35 3.33 N/A 0.25 39 <0.2 <0.2
N/A <5 N/A <0.05 N/A N/A N/A <5 <0.023 N/A 0.975 N/A <1 N/A 3.51 N/A 0.18 32 N/A <0.2
N/A <5 N/A <0.05 N/A N/A N/A <5 <0.023 N/A 0.96 N/A <1 N/A 3.37 N/A 0.2 42 N/A <0.2
<5 <5 N/A <0.05 N/A N/A <5 <5 <0.023 0.989 0.96 <1 <1 3.32 3.28 N/A 0.18 42 <0.2 <0.2
N/A <5 N/A <0.05 N/A N/A N/A <5 <0.023 N/A 0.94 N/A <1 N/A 3.47 N/A 0.15 41 N/A <0.2
N/A 256 N/A <0.05 N/A N/A N/A 7 <0.1 N/A N/A N/A <1 N/A N/A N/A 0.97 120 N/A <0.2
N/A 413 N/A <0.05 N/A N/A N/A <5 <0.1 N/A N/A N/A <1 N/A N/A N/A 0.22 <50 N/A <0.2
N/A 304 N/A <0.05 N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 0.17 22 N/A <0.2
Tables - Page 16
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection Date
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
Analytical Parameter
MW-7SR Upgradient Residuum 10/4/2011
MW-7SR Upgradient Residuum 2/22/2012
MW-7SR Upgradient Residuum 6/5/2012
MW-7SR Upgradient Residuum 10/3/2012
MW-7SR Upgradient Residuum 2/4/2013
MW-7SR Upgradient Residuum 6/3/2013
MW-7SR Upgradient Residuum 10/14/2013
MW-7SR Upgradient Residuum 2/5/2014
MW-7SR Upgradient Residuum 6/2/2014
MW-8D Compliance Transition (Saprolite)12/6/2010
MW-8D Compliance Transition (Saprolite)2/1/2011
MW-8D Compliance Transition (Saprolite)6/7/2011
MW-8D Compliance Transition (Saprolite)10/3/2011
MW-8D Compliance Transition (Saprolite)2/6/2012
MW-8D Compliance Transition (Saprolite)6/4/2012
MW-8D Compliance Transition (Saprolite)10/3/2012
MW-8D Compliance Transition (Saprolite)2/4/2013
MW-8D Compliance Transition (Saprolite)6/3/2013
MW-8D Compliance Transition (Saprolite)10/14/2013
MW-8D Compliance Transition (Saprolite)2/4/2014
MW-8D Compliance Transition (Saprolite)6/2/2014
MW-8I Compliance Residuum 12/6/2010
MW-8I Compliance Residuum 2/1/2011
MW-8I Compliance Residuum 6/7/2011
MW-8I Compliance Residuum 10/3/2011
MW-8I Compliance Residuum 2/6/2012
MW-8I Compliance Residuum 6/4/2012
MW-8I Compliance Residuum 10/3/2012
MW-8I Compliance Residuum 2/4/2013
MW-8I Compliance Residuum 6/3/2013
MW-8I Compliance Residuum 10/14/2013
MW-8I Compliance Residuum 2/4/2014
MW-8I Compliance Residuum 6/2/2014
MW-8S Compliance Residuum 12/6/2010
MW-8S Compliance Residuum 2/1/2011
MW-8S Compliance Residuum 6/7/2011
MW-8S Compliance Residuum 10/3/2011
MW-8S Compliance Residuum 2/6/2012
MW-8S Compliance Residuum 6/4/2012
MW-8S Compliance Residuum 10/3/2012
MW-8S Compliance Residuum 2/4/2013
MW-8S Compliance Residuum 6/3/2013
MW-8S Compliance Residuum 10/14/2013
MW-8S Compliance Residuum 2/4/2014
MW-8S Compliance Residuum 6/2/2014
MW-9 Compliance Residuum 12/6/2010
MW-9 Compliance Residuum 2/1/2011
MW-9 Compliance Residuum 6/6/2011
MW-9 Compliance Residuum 10/4/2011
MW-9 Compliance Residuum 2/6/2012
MW-9 Compliance Residuum 6/5/2012
MW-9 Compliance Residuum 10/3/2012
MW-9 Compliance Residuum 2/4/2013
MW-9 Compliance Residuum 6/4/2013
MW-9 Compliance Residuum 10/15/2013
MW-9 Compliance Residuum 2/5/2014
MW-9 Compliance Residuum 6/2/2014
Nitrate as N Strontium Sulfate TDS
mg-N/L N/A mg/L mg/L
10 NE 250 500
300.0 N/A 300.0 2540C
Dissolved Total Dissolved Total Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Total Total Total Dissolved Total
Manganese Mercury
200.7 200.8 200.7 200.8
NE 20 NE 0.2*
Potassium Selenium Sodium Thallium
mg/L µg/L mg/L µg/L
200.8 200.7200.8 245.1
100501NE
µg/L µg/L µg/L µg/L
Molybdenum Nickel
N/A 167 N/A <0.05 N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 0.17 <10 N/A <0.2
N/A 113 N/A <0.05 N/A N/A N/A <5 <0.1 N/A N/A N/A <1 N/A N/A N/A <1 24 N/A <0.2
N/A 122 N/A <0.05 N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 0.13 32 N/A <0.2
N/A 67 N/A <0.05 N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 0.19 10 N/A <0.2
49 43 N/A <0.05 N/A N/A <5 <5 0.02 0.773 0.776 <1 <1 1.17 1.11 N/A 0.21 15 <0.2 <0.2
N/A 38 N/A <0.05 N/A N/A N/A <5 <0.023 N/A 0.777 N/A <1 N/A 1.21 N/A 0.15 <25 N/A <0.2
N/A 68 N/A <0.05 N/A N/A N/A <5 <0.023 N/A 0.799 N/A <1 N/A 1.05 N/A 0.16 <25 N/A <0.2
41 40 N/A <0.05 N/A N/A <5 <5 0.02 0.756 0.737 <1 <1 1.19 1.12 N/A 0.16 <25 <0.2 <0.2
N/A 33 N/A <0.05 N/A N/A N/A <5 <0.023 N/A 0.737 N/A <1 N/A 1.18 N/A 0.12 <25 N/A <0.2
N/A 743 N/A <0.05 N/A N/A N/A <5 <0.1 N/A N/A N/A <1 N/A N/A N/A 0.7 140 N/A <0.2
N/A 671 N/A <0.05 N/A N/A N/A <5 <0.1 N/A N/A N/A <1 N/A N/A N/A 0.74 130 N/A <0.2
N/A 622 N/A <0.05 N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 0.71 120 N/A <0.2
N/A 535 N/A <0.05 N/A N/A N/A <5 0.02 N/A N/A N/A <1 N/A N/A N/A 0.74 110 N/A <0.2
N/A 452 N/A <0.05 N/A N/A N/A <5 <0.02 N/A N/A N/A <1 N/A N/A N/A 0.62 120 N/A <0.2
N/A 174 N/A <0.05 N/A N/A N/A <5 0.02 N/A N/A N/A <1 N/A N/A N/A 0.76 122 N/A <0.2
N/A 82 N/A <0.05 N/A N/A N/A <5 0.03 N/A N/A N/A <1 N/A N/A N/A 0.53 130 N/A <0.2
19 143 N/A <0.05 N/A N/A <5 <5 0.05 1.02 1.14 <1 <1 12.3 13 N/A 1.3 150 <0.2 <0.2
N/A 86 N/A <0.05 N/A N/A N/A <5 0.04 N/A 1.14 N/A <1 N/A 13.7 N/A 1.4 120 N/A <0.2
N/A 34 N/A <0.05 N/A N/A N/A <5 0.04 N/A 1.06 N/A <1 N/A 13.1 N/A 1.1 120 N/A <0.2
<5 118 N/A <0.05 N/A N/A <5 <5 0.04 1.01 1.45 <1 <1 12.1 12.7 N/A 0.97 140 <0.2 <0.2
N/A 35 N/A <0.05 N/A N/A N/A <5 0.03 N/A 1.22 N/A <1 N/A 11.7 N/A 0.8 140 N/A <0.2
N/A 538 N/A <0.05 N/A N/A N/A <5 <0.1 N/A N/A N/A <1 N/A N/A N/A 0.66 110 N/A <0.2
N/A 290 N/A <0.05 N/A N/A N/A <5 <0.1 N/A N/A N/A <1 N/A N/A N/A 1.2 100 N/A <0.2
N/A 43 N/A <0.05 N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 1.2 92 N/A <0.2
N/A 52 N/A <0.05 N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 1.1 100 N/A <0.2
N/A 32 N/A <0.05 N/A N/A N/A <5 <0.02 N/A N/A N/A <1 N/A N/A N/A 0.57 100 N/A <0.2
N/A 39 N/A <0.05 N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 0.46 95 N/A <0.2
N/A 23 N/A <0.05 N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 0.35 87 N/A <0.2
<5 168 N/A <0.05 N/A N/A <5 <5 <0.023 0.904 0.979 <1 <1 7.27 7.42 N/A 0.27 91 <0.2 <0.2
N/A 93 N/A <0.05 N/A N/A N/A <5 <0.023 N/A 0.978 N/A <1 N/A 7.4 N/A 0.25 78 N/A <0.2
N/A 24 N/A <0.05 N/A N/A N/A <5 <0.023 N/A 0.965 N/A <1 N/A 7.48 N/A 0.26 79 N/A <0.2
<5 15 N/A <0.05 N/A N/A <5 <5 <0.023 0.961 0.973 <1 <1 7.86 7.64 N/A 0.24 87 <0.2 <0.2
N/A 47 N/A <0.05 N/A N/A N/A <5 <0.023 N/A 0.968 N/A <1 N/A 7.46 N/A 0.21 88 N/A <0.2
N/A 123 N/A <0.05 N/A N/A N/A <5 <0.1 N/A N/A N/A <1 N/A N/A N/A 0.58 <50 N/A <0.2
N/A 135 N/A <0.05 N/A N/A N/A <5 <0.1 N/A N/A N/A <1 N/A N/A N/A 0.39 <50 N/A <0.2
N/A 144 N/A <0.05 N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 0.26 20 N/A <0.2
N/A 135 N/A <0.05 N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 0.25 18 N/A <0.2
N/A 133 N/A <0.05 N/A N/A N/A <5 <0.02 N/A N/A N/A <1 N/A N/A N/A 0.16 22 N/A <0.2
N/A 126 N/A <0.05 N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 0.19 <25 N/A <0.2
N/A 104 N/A <0.05 N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 0.18 11 N/A <0.2
99 90 N/A <0.05 N/A N/A <5 <5 <0.023 0.625 0.648 <1 <1 1.19 1.18 N/A 0.17 12 <0.2 <0.2
N/A 87 N/A <0.05 N/A N/A N/A <5 <0.023 N/A 0.615 N/A <1 N/A 1.59 N/A 0.15 <25 N/A <0.2
N/A 78 N/A <0.05 N/A N/A N/A <5 <0.023 N/A 0.601 N/A <1 N/A 1.66 N/A 0.18 <25 N/A <0.2
68 68 N/A <0.05 N/A N/A <5 <5 <0.023 0.626 0.662 <1 <1 1.43 1.43 N/A 0.15 <25 <0.2 <0.2
N/A 77 N/A <0.05 N/A N/A N/A <5 <0.023 N/A 0.628 N/A <1 N/A 1.92 N/A 0.16 <25 N/A <0.2
N/A 282 N/A <0.05 N/A N/A N/A <5 0.43 N/A N/A N/A <1 N/A N/A N/A 23 200 N/A <0.2
N/A 147 N/A <0.05 N/A N/A N/A <5 0.1 N/A N/A N/A <1 N/A N/A N/A 22 140 N/A <0.2
N/A 87 N/A <0.05 N/A N/A N/A <5 0.1 N/A N/A N/A <1 N/A N/A N/A 24 140 N/A <0.2
N/A 62 N/A <0.05 N/A N/A N/A <5 0.09 N/A N/A N/A <1 N/A N/A N/A 23 120 N/A <0.2
N/A 68 N/A <0.05 N/A N/A N/A <5 0.08 N/A N/A N/A <1 N/A N/A N/A 28 150 N/A <0.2
N/A 25 N/A <0.05 N/A N/A N/A <5 0.08 N/A N/A N/A <1 N/A N/A N/A 29 127 N/A <0.2
N/A 25 N/A <0.05 N/A N/A N/A <5 0.08 N/A N/A N/A <1 N/A N/A N/A 30 140 N/A <0.2
5 49 N/A <0.05 N/A N/A <5 <5 0.08 1.13 1.26 <1 <1 11.8 11.8 N/A 32 170 <0.2 <0.2
N/A 20 N/A <0.05 N/A N/A N/A <5 0.08 N/A 1.22 N/A <1 N/A 11.9 N/A 35 150 N/A <0.2
N/A 10 N/A <0.05 N/A N/A N/A <5 0.1 N/A 1.17 N/A <1 N/A 12 N/A 35 140 N/A <0.2
<5 7 N/A <0.05 N/A N/A <5 <5 0.09 1.19 1.21 <1 <1 12.3 12.3 N/A 36 150 <0.2 <0.2
N/A 7 N/A <0.05 N/A N/A N/A <5 0.08 N/A 1.19 N/A <1 N/A 12.1 N/A 34 150 N/A <0.2
Tables - Page 17
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection Date
MW-10 Compliance Residuum 12/6/2010
MW-10 Compliance Residuum 2/1/2011
MW-10 Compliance Residuum 6/7/2011
MW-10 Compliance Residuum 10/3/2011
MW-10 Compliance Residuum 2/6/2012
MW-10 Compliance Residuum 6/4/2012
MW-10 Compliance Residuum 10/3/2012
MW-10 Compliance Residuum 2/4/2013
MW-10 Compliance Residuum 6/4/2013
MW-10 Compliance Residuum 10/15/2013
MW-10 Compliance Residuum 2/3/2014
MW-10 Compliance Residuum 6/2/2014
MW-11DR Compliance Bedrock 2/1/2011
MW-11DR Compliance Bedrock 6/6/2011
MW-11DR Compliance Bedrock 10/3/2011
MW-11DR Compliance Bedrock 2/6/2012
MW-11DR Compliance Bedrock 6/4/2012
MW-11DR Compliance Bedrock 10/3/2012
MW-11DR Compliance Bedrock 2/4/2013
MW-11DR Compliance Bedrock 6/3/2013
MW-11DR Compliance Bedrock 10/14/2013
MW-11DR Compliance Bedrock 2/3/2014
MW-11DR Compliance Bedrock 6/2/2014
MW-11SR Compliance Residuum 2/1/2011
MW-11SR Compliance Residuum 6/6/2011
MW-11SR Compliance Residuum 10/3/2011
MW-11SR Compliance Residuum 2/6/2012
MW-11SR Compliance Residuum 6/4/2012
MW-11SR Compliance Residuum 10/3/2012
MW-11SR Compliance Residuum 2/4/2013
MW-11SR Compliance Residuum 6/3/2013
MW-11SR Compliance Residuum 10/14/2013
MW-11SR Compliance Residuum 2/3/2014
MW-11SR Compliance Residuum 6/2/2014
MW-12 Compliance Residuum 12/6/2010
MW-12 Compliance Residuum 2/1/2011
MW-13 Compliance Residuum 12/6/2010
MW-13 Compliance Residuum 2/1/2011
MW-13 Compliance Residuum 6/7/2011
MW-13 Compliance Residuum 10/4/2011
MW-13 Compliance Residuum 2/6/2012
MW-13 Compliance Residuum 6/5/2012
MW-13 Compliance Residuum 10/3/2012
MW-13 Compliance Residuum 2/5/2013
MW-13 Compliance Residuum 6/3/2013
MW-13 Compliance Residuum 10/15/2013
MW-13 Compliance Residuum 2/3/2014
MW-13 Compliance Residuum 6/2/2014
MW-14 Compliance Residuum 12/6/2010
MW-14 Compliance Residuum 2/1/2011
MW-14 Compliance Residuum 6/7/2011
MW-14 Compliance Residuum 10/4/2011
MW-14 Compliance Residuum 2/6/2012
MW-14 Compliance Residuum 6/5/2012
MW-14 Compliance Residuum 10/3/2012
MW-14 Compliance Residuum 2/4/2013
MW-14 Compliance Residuum 6/3/2013
MW-14 Compliance Residuum 10/15/2013
MW-14 Compliance Residuum 2/3/2014
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
Analytical Parameter TOC TOX TSS
mg/L µg/L mg/L
NE NE NE
5310B 2450D
Total Total Total Dissolved Total
N/A N/A N/A N/A 0.009
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A <0.005 <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A <0.005 <0.005
N/A N/A N/A N/A 0.009
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A 0.008
N/A N/A N/A N/A 0.009
N/A N/A N/A N/A 0.011
N/A N/A N/A N/A 0.01
N/A N/A N/A N/A 0.009
N/A N/A N/A 0.009 0.009
N/A N/A N/A N/A 0.01
N/A N/A N/A N/A <0.005
N/A N/A N/A 0.007 0.007
N/A N/A N/A N/A 0.008
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A <0.005 <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A <0.005 <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A <0.005 <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A <0.005 <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A <0.005 <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A <0.005 <0.005
200.7
Zinc
mg/L
1
Tables - Page 18
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection Date
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
Analytical Parameter
MW-14 Compliance Residuum 6/2/2014
MW-15 Compliance Residuum 2/23/2011
MW-15 Compliance Residuum 6/6/2011
MW-15 Compliance Residuum 10/3/2011
MW-15 Compliance Residuum 2/6/2012
MW-15 Compliance Residuum 6/5/2012
MW-15 Compliance Residuum 10/3/2012
MW-15 Compliance Residuum 2/4/2013
MW-15 Compliance Residuum 6/3/2013
MW-15 Compliance Residuum 10/14/2013
MW-15 Compliance Residuum 2/3/2014
MW-15 Compliance Residuum 6/2/2014
MW-1D Voluntary Not Reported 12/16/2008
MW-1D Voluntary Not Reported 6/22/2009
MW-1D Voluntary Not Reported 12/14/2009
MW-1D Voluntary Not Reported 6/28/2010
MW-1S Voluntary Not Reported 12/16/2008
MW-1S Voluntary Not Reported 6/22/2009
MW-1S Voluntary Not Reported 12/14/2009
MW-1S Voluntary Not Reported 6/28/2010
MW-1S Voluntary Not Reported 12/6/2010
MW-1S Voluntary Not Reported 2/1/2011
MW-1S Voluntary Not Reported 6/7/2011
MW-2D Voluntary Not Reported 12/16/2008
MW-2D Voluntary Not Reported 6/22/2009
MW-2D Voluntary Not Reported 12/14/2009
MW-2D Voluntary Not Reported 6/28/2010
MW-2S Voluntary Not Reported 12/16/2008
MW-2S Voluntary Not Reported 6/22/2009
MW-2S Voluntary Not Reported 12/14/2009
MW-2S Voluntary Not Reported 6/28/2010
MW-2S Voluntary Not Reported 12/6/2010
MW-2S Voluntary Not Reported 2/1/2011
MW-2S Voluntary Not Reported 6/7/2011
MW-2S Voluntary Not Reported 10/3/2011
MW-3D Voluntary Not Reported 12/16/2008
MW-3D Voluntary Not Reported 6/22/2009
MW-3D Voluntary Not Reported 12/14/2009
MW-3D Voluntary Not Reported 6/28/2010
MW-3S Voluntary Not Reported 12/16/2008
MW-3S Voluntary Not Reported 6/22/2009
MW-3S Voluntary Not Reported 12/14/2009
MW-3S Voluntary Not Reported 6/28/2010
MW-3S Voluntary Not Reported 12/6/2010
MW-3S Voluntary Not Reported 2/1/2011
MW-3S Voluntary Not Reported 6/7/2011
MW-3S Voluntary Not Reported 10/4/2011
MW-4D Voluntary Not Reported 12/16/2008
MW-4D Voluntary Not Reported 6/22/2009
MW-4D Voluntary Not Reported 12/14/2009
MW-4D Voluntary Not Reported 6/28/2010
MW-4D Voluntary Not Reported 2/5/2013
MW-4D Voluntary Not Reported 10/15/2013
MW-4D Voluntary Not Reported 2/4/2014
MW-4D Voluntary Not Reported 6/3/2014
MW-4S Voluntary Not Reported 12/16/2008
MW-4S Voluntary Not Reported 6/22/2009
MW-4S Voluntary Not Reported 12/14/2009
MW-4S Voluntary Not Reported 6/28/2010
TOC TOX TSS
mg/L µg/L mg/L
NE NE NE
5310B 2450D
Total Total Total Dissolved Total
200.7
Zinc
mg/L
1
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A 0.006
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A 0.007
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A 0.005
N/A N/A N/A <0.005 0.006
N/A N/A N/A N/A 0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A <0.005 0.006
N/A N/A N/A N/A 0.006
0.118 40 N/A N/A 0.006
0.143 130 N/A N/A 0.007
0.1 <50 N/A N/A 0.009
<0.1 <100 N/A N/A 0.01
0.28 80 N/A N/A 0.007
0.288 40 N/A N/A 0.007
0.278 <50 N/A N/A <0.005
0.216 <100 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
0.132 20 N/A N/A <0.005
0.131 40 N/A N/A <0.005
0.109 <50 N/A N/A 0.009
<0.1 <100 N/A N/A <0.005
0.151 40 N/A N/A 0.006
0.138 30 N/A N/A <0.005
0.108 <50 N/A N/A 0.007
<0.1 <100 N/A N/A 0.006
N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A
0.124 90 N/A N/A <0.005
0.135 50 N/A N/A <0.005
<0.1 <50 N/A N/A <0.005
<0.1 <100 N/A N/A <0.005
0.616 80 N/A N/A <0.005
0.514 50 N/A N/A <0.005
0.671 <50 N/A N/A <0.005
0.448 <100 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
0.152 80 N/A N/A 0.009
0.164 40 N/A N/A 0.009
0.113 <50 N/A N/A 0.008
<0.1 <100 N/A N/A 0.012
N/A N/A N/A <0.005 0.006
N/A N/A N/A N/A <0.005
N/A N/A N/A <0.005 0.006
N/A N/A N/A N/A N/A
2.44 50 N/A N/A 0.018
0.641 30 N/A N/A 0.03
0.794 <50 N/A N/A 0.059
0.44 <100 N/A N/A 0.012
Tables - Page 19
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection Date
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
Analytical Parameter
MW-4S Voluntary Not Reported 12/6/2010
MW-4S Voluntary Not Reported 2/1/2011
MW-4S Voluntary Not Reported 6/7/2011
MW-4S Voluntary Not Reported 10/4/2011
MW-4S Voluntary Not Reported 2/5/2013
MW-4S Voluntary Not Reported 10/15/2013
MW-4S Voluntary Not Reported 2/4/2014
MW-4S Voluntary Not Reported 6/3/2014
MW-5D Voluntary Not Reported 12/16/2008
MW-5D Voluntary Not Reported 6/22/2009
MW-5D Voluntary Not Reported 12/14/2009
MW-5D Voluntary Not Reported 6/28/2010
MW-5D Voluntary Not Reported 2/4/2013
MW-5D Voluntary Not Reported 10/15/2013
MW-5D Voluntary Not Reported 2/4/2014
MW-5D Voluntary Not Reported 6/3/2014
MW-5S Voluntary Not Reported 12/16/2008
MW-5S Voluntary Not Reported 6/22/2009
MW-5S Voluntary Not Reported 12/14/2009
MW-5S Voluntary Not Reported 6/28/2010
MW-5S Voluntary Not Reported 12/6/2010
MW-5S Voluntary Not Reported 2/1/2011
MW-5S Voluntary Not Reported 6/7/2011
MW-5S Voluntary Not Reported 10/4/2011
MW-5S Voluntary Not Reported 2/4/2013
MW-5S Voluntary Not Reported 10/15/2013
MW-5S Voluntary Not Reported 2/4/2014
MW-5S Voluntary Not Reported 6/3/2014
MW-6D Voluntary Not Reported 12/16/2008
MW-6D Voluntary Not Reported 6/22/2009
MW-6D Voluntary Not Reported 12/14/2009
MW-6D Voluntary Not Reported 6/28/2010
MW-6S Voluntary Not Reported 12/16/2008
MW-6S Voluntary Not Reported 6/22/2009
MW-6S Voluntary Not Reported 12/14/2009
MW-6S Voluntary Not Reported 6/28/2010
MW-6S Voluntary Not Reported 12/6/2010
MW-6S Voluntary Not Reported 2/1/2011
MW-6S Voluntary Not Reported 6/7/2011
MW-6S Voluntary Not Reported 10/4/2011
MW-7D Upgradient Not Reported 12/16/2008
MW-7D Upgradient Not Reported 6/22/2009
MW-7D Upgradient Not Reported 12/14/2009
MW-7D Upgradient Not Reported 6/28/2010
MW-7D Upgradient Not Reported 12/6/2010
MW-7D Upgradient Not Reported 2/2/2011
MW-7D Upgradient Not Reported 6/6/2011
MW-7D Upgradient Not Reported 10/4/2011
MW-7D Upgradient Not Reported 2/22/2012
MW-7D Upgradient Not Reported 6/5/2012
MW-7D Upgradient Not Reported 10/3/2012
MW-7D Upgradient Not Reported 2/4/2013
MW-7D Upgradient Not Reported 6/3/2013
MW-7D Upgradient Not Reported 10/14/2013
MW-7D Upgradient Not Reported 2/5/2014
MW-7D Upgradient Not Reported 6/2/2014
MW-7SR Upgradient Residuum 12/6/2010
MW-7SR Upgradient Residuum 2/2/2011
MW-7SR Upgradient Residuum 6/6/2011
TOC TOX TSS
mg/L µg/L mg/L
NE NE NE
5310B 2450D
Total Total Total Dissolved Total
200.7
Zinc
mg/L
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 0.036 0.281
N/A N/A N/A N/A <0.005
N/A N/A N/A 0.013 0.01
N/A N/A N/A N/A N/A
0.197 <20 N/A N/A <0.005
0.164 30 N/A N/A <0.005
0.165 <50 N/A N/A <0.005
0.116 <100 N/A N/A <0.005
N/A N/A N/A <0.005 <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A <0.005 <0.005
N/A N/A N/A N/A N/A
0.317 <20 N/A N/A <0.005
0.224 50 N/A N/A <0.005
0.201 <50 N/A N/A <0.005
0.182 <100 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 <0.005 <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A <0.005 <0.005
N/A N/A N/A N/A N/A
0.124 20 N/A N/A <0.005
0.129 40 N/A N/A <0.005
<0.1 <50 N/A N/A <0.005
<0.1 <100 N/A N/A <0.005
0.128 20 N/A N/A <0.005
0.148 30 N/A N/A <0.005
0.102 <50 N/A N/A <0.005
<0.1 <100 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
0.1 <20 N/A N/A 0.006
0.134 <20 N/A N/A <0.005
0.12 <50 N/A N/A 0.006
<0.1 <100 N/A N/A 0.006
N/A N/A N/A N/A 0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A 0.006 0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A <0.005 0.006
N/A N/A N/A N/A 0.006
N/A N/A N/A N/A 0.006
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
Tables - Page 20
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection Date
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
Analytical Parameter
MW-7SR Upgradient Residuum 10/4/2011
MW-7SR Upgradient Residuum 2/22/2012
MW-7SR Upgradient Residuum 6/5/2012
MW-7SR Upgradient Residuum 10/3/2012
MW-7SR Upgradient Residuum 2/4/2013
MW-7SR Upgradient Residuum 6/3/2013
MW-7SR Upgradient Residuum 10/14/2013
MW-7SR Upgradient Residuum 2/5/2014
MW-7SR Upgradient Residuum 6/2/2014
MW-8D Compliance Transition (Saprolite)12/6/2010
MW-8D Compliance Transition (Saprolite)2/1/2011
MW-8D Compliance Transition (Saprolite)6/7/2011
MW-8D Compliance Transition (Saprolite)10/3/2011
MW-8D Compliance Transition (Saprolite)2/6/2012
MW-8D Compliance Transition (Saprolite)6/4/2012
MW-8D Compliance Transition (Saprolite)10/3/2012
MW-8D Compliance Transition (Saprolite)2/4/2013
MW-8D Compliance Transition (Saprolite)6/3/2013
MW-8D Compliance Transition (Saprolite)10/14/2013
MW-8D Compliance Transition (Saprolite)2/4/2014
MW-8D Compliance Transition (Saprolite)6/2/2014
MW-8I Compliance Residuum 12/6/2010
MW-8I Compliance Residuum 2/1/2011
MW-8I Compliance Residuum 6/7/2011
MW-8I Compliance Residuum 10/3/2011
MW-8I Compliance Residuum 2/6/2012
MW-8I Compliance Residuum 6/4/2012
MW-8I Compliance Residuum 10/3/2012
MW-8I Compliance Residuum 2/4/2013
MW-8I Compliance Residuum 6/3/2013
MW-8I Compliance Residuum 10/14/2013
MW-8I Compliance Residuum 2/4/2014
MW-8I Compliance Residuum 6/2/2014
MW-8S Compliance Residuum 12/6/2010
MW-8S Compliance Residuum 2/1/2011
MW-8S Compliance Residuum 6/7/2011
MW-8S Compliance Residuum 10/3/2011
MW-8S Compliance Residuum 2/6/2012
MW-8S Compliance Residuum 6/4/2012
MW-8S Compliance Residuum 10/3/2012
MW-8S Compliance Residuum 2/4/2013
MW-8S Compliance Residuum 6/3/2013
MW-8S Compliance Residuum 10/14/2013
MW-8S Compliance Residuum 2/4/2014
MW-8S Compliance Residuum 6/2/2014
MW-9 Compliance Residuum 12/6/2010
MW-9 Compliance Residuum 2/1/2011
MW-9 Compliance Residuum 6/6/2011
MW-9 Compliance Residuum 10/4/2011
MW-9 Compliance Residuum 2/6/2012
MW-9 Compliance Residuum 6/5/2012
MW-9 Compliance Residuum 10/3/2012
MW-9 Compliance Residuum 2/4/2013
MW-9 Compliance Residuum 6/4/2013
MW-9 Compliance Residuum 10/15/2013
MW-9 Compliance Residuum 2/5/2014
MW-9 Compliance Residuum 6/2/2014
TOC TOX TSS
mg/L µg/L mg/L
NE NE NE
5310B 2450D
Total Total Total Dissolved Total
200.7
Zinc
mg/L
1
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A 0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A <0.005 <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A <0.005 <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A 0.012
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A 0.007
N/A N/A N/A N/A 0.007
N/A N/A N/A N/A 0.009
N/A N/A N/A <0.005 0.009
N/A N/A N/A N/A 0.006
N/A N/A N/A N/A <0.005
N/A N/A N/A <0.005 0.014
N/A N/A N/A N/A 0.01
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A 0.006
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A <0.005 <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A <0.005 <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A 0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A <0.005 <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A <0.005 <0.005
N/A N/A N/A N/A 0.007
N/A N/A N/A N/A 0.01
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A 0.006
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A 0.009
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A <0.005 0.007
N/A N/A N/A N/A <0.005
N/A N/A N/A N/A <0.005
N/A N/A N/A 0.013 <0.005
N/A N/A N/A N/A <0.005
Tables - Page 21
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
TOX = Total organic halides
3.Units:
˚C = Degrees Celsius
SU = Standard Units
mV = millivolts
NTU = Nephelometric Turbidity Unit
mg/L = milligrams per liter
µg/L = micrograms per liter
µmhos/cm = micromhos per centimeter
CaCO3 = calcium carbonate
HCO3
- = bicarbonate
CO3
2- = 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 22
Table 5 - Ash Analytical Results
pH % Solids Aluminum Antimony Arsenic Barium Beryllium Boron Cadmium Calcium Chromium Cobalt Copper Iron Lead Magnesium Manganese Mercury Molybdenum
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 mg/kg mg/kg
Analytical Method 200.8 200.8 200.7 200.7 200.8 200.7 200.7 200.8 200.7 200.7 200.8 200.7 200.8 245.1 200.8
Site Name Sample Collection Date
Comp_1 11/30/2006 7.65 N/A N/A 0.75 31 260 N/A 41 0.64 2100 13 N/A 54 N/A 12 710 58 0.036 N/A
Comp_1 3/21/2007 7.05 N/A N/A 0.4 24 240 N/A <1.89105 0.44 1300 9.2 N/A 37 N/A 7.9 400 53 0.057 N/A
Comp_2 11/30/2006 7.56 N/A N/A 1.2 48 400 N/A 51 0.75 3600 18 N/A 74 N/A 21 1100 59 0.043 N/A
Comp_2 3/21/2007 7.01 N/A N/A 0.51 24 270 N/A 4.8 0.39 1400 10 N/A 39 N/A 9 660 62 0.063 N/A
Ponded 1/1/1997 N/A N/A N/A N/A N/A N/A N/A N/A N/A 2630 N/A N/A 53 N/A N/A 700 67 N/A N/A
Ponded 1/1/1999 N/A N/A N/A N/A N/A N/A N/A N/A N/A 1025.4 N/A N/A 24.1 20824 N/A 360.6 89.3 N/A N/A
Ponded 1/1/2000 N/A N/A N/A N/A N/A N/A N/A N/A N/A 1643.6 N/A N/A 32.2 25650 N/A 435.4 130.9 N/A N/A
Ponded 1/1/2003 N/A N/A N/A N/A N/A N/A N/A N/A N/A 1833.1 N/A N/A 43.3 N/A N/A 549.5 38.8 N/A N/A
Ponded 12/12/2006 N/A N/A N/A <0.81 30 260 N/A 26 0.19 2000 12 N/A 45 0.04 11 730 44 0.036 2.8
Units
Analytical Parameter
Field Measurement
Tables - Page 23
Table 5 - Ash Analytical Results
Analytical Method
Site Name Sample Collection Date
Comp_1 11/30/2006
Comp_1 3/21/2007
Comp_2 11/30/2006
Comp_2 3/21/2007
Ponded 1/1/1997
Ponded 1/1/1999
Ponded 1/1/2000
Ponded 1/1/2003
Ponded 12/12/2006
Units
Analytical Parameter Nickel Phosphorus Potassium Selenium Silver Sodium Strontium Thallium Zinc
mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg
200.7 200.7 200.8 200.7 200.8 200.7
20 400 1500 N/A <1.1 270 N/A N/A 21
15 320 830 3.7 <0.0256642 120 N/A N/A 13
28 520 2500 N/A <1 400 N/A N/A 36
15 400 1200 2.6 <0.0266274 140 N/A N/A 16
15 640 1070 N/A N/A 170 N/A N/A 20
11.3 <0.2 753 N/A N/A 130.5 N/A N/A 12.3
14.9 6.4 532.5 N/A N/A 96 N/A N/A 15.8
12 271.7 983 N/A N/A 203.5 N/A N/A 15.35
19 410 1500 2.2 <1 250 N/A N/A 19
Tables - Page 24
Table 5 - Ash Analytical Results
Notes:
1.Units:
SU = Standard Units
mg/kg = milligrams per kilogram
2.N/A = Not applicable
3.NE = Not established
Tables - Page 25
TABLE 6- SURFACE WATER ANALYTICAL RESULTS
Analytical Parameter Depth to Water Temp.DO Cond.pH ORP Turbidity Aluminum
Units Feet ˚C mg/L µmhos/cm SU mV NTU mg/L CaCO3 mg/L HCO3-mg/L CO32-N/A
15A NCAC 02B .0200 Surface Water Quality Standard (WS Waters)NE NE NE NE 6.0 - 9.0 NE NE NE NE NE 87
Analytical Method 2320B4d N/A N/A 0
Well Name Sample Collection Date Total Dissolved Total
277.5-0.3M 4/29/2014 N/A 17.96 N/A 57.9 7.19 N/A N/A N/A N/A N/A 237 N/A <1
277.6-0.3m 2/25/2010 N/A 8.26 10.75 56 7.35 N/A 8.5 N/A N/A N/A N/A N/A N/A
277.6-0.3m 8/4/2010 N/A 29.93 6.28 66 7.14 N/A 3.1 N/A N/A N/A N/A N/A N/A
277.6-0.3m 2/9/2011 N/A 8.24 10.61 66 7.19 N/A 3 15 N/A N/A N/A N/A N/A
277.6-0.3m 8/3/2011 N/A 30.65 6.5 70 7.04 N/A 1.8 12 N/A N/A N/A N/A N/A
277.6-0.3m 2/2/2012 N/A 10.87 9.91 68 6.94 N/A 3.9 14 N/A N/A N/A N/A N/A
277.6-0.3m 8/2/2012 N/A 29.97 5.76 68 6.91 N/A 2.1 15 N/A N/A N/A N/A N/A
277.6-0.3m 2/14/2013 N/A 9.95 10.13 65 6.87 N/A 4 15 N/A N/A N/A N/A N/A
278.0-0.3m 2/25/2010 N/A 8.32 10.75 56 7.3 N/A N/A N/A N/A N/A N/A N/A N/A
278.0-0.3m 8/4/2010 N/A 30.24 5.63 63 6.99 N/A N/A N/A N/A N/A N/A N/A N/A
278.0-0.3m 2/9/2011 N/A 8.38 10.53 66 7.24 N/A N/A N/A N/A N/A N/A N/A N/A
278.0-0.3m 8/3/2011 N/A 30.28 5.69 69 6.93 N/A N/A N/A N/A N/A N/A N/A N/A
278.0-0.3m 8/30/2011 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
278.0-0.3m 2/2/2012 N/A 10.88 9.97 68 7.02 N/A 1.1 14 N/A N/A N/A N/A N/A
278.0-0.3m 8/2/2012 N/A 29.82 5.24 67 6.88 N/A 2 15 N/A N/A N/A N/A N/A
278.0-0.3m 2/14/2013 N/A 9.55 10.11 65 6.92 N/A 5.1 15 N/A N/A N/A N/A N/A
278.0-0.3m 4/29/2014 N/A 17.99 N/A 57.7 7.21 N/A N/A N/A N/A N/A 158 N/A <1
Tower-0.3m 2/5/2013 N/A 7.92 11.74 120 7 342 18.8 16 N/A N/A N/A 2.96 2.8
Tower-0.3m 6/3/2013 N/A 26.95 8.05 154 8.23 151 2.16 17 N/A N/A N/A N/A 4.31
Tower-0.3m 10/14/2013 N/A 22.08 7.42 161 7.2 300 4.74 19 N/A N/A N/A N/A 3.24
Tower-0.3m 2/4/2014 N/A 6.39 12.03 166 5.99 395 4.99 3.3 N/A N/A N/A 1.72 1.65
Tower-0.3m 4/29/2014 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 119 N/A 1.28
Tower-0.3m 6/2/2014 N/A 27.61 7.32 163 6.6 338 2.77 <5 N/A N/A N/A N/A 1.89
Field Measurements 200.8
Total
Alkalinity Antimony
µg/L
5.6
Tables - Page 26
TABLE 6- SURFACE WATER ANALYTICAL RESULTS
Analytical Parameter
Units
15A NCAC 02B .0200 Surface Water Quality Standard (WS Waters)
Analytical Method
Well Name Sample Collection Date
277.5-0.3M 4/29/2014
277.6-0.3m 2/25/2010
277.6-0.3m 8/4/2010
277.6-0.3m 2/9/2011
277.6-0.3m 8/3/2011
277.6-0.3m 2/2/2012
277.6-0.3m 8/2/2012
277.6-0.3m 2/14/2013
278.0-0.3m 2/25/2010
278.0-0.3m 8/4/2010
278.0-0.3m 2/9/2011
278.0-0.3m 8/3/2011
278.0-0.3m 8/30/2011
278.0-0.3m 2/2/2012
278.0-0.3m 8/2/2012
278.0-0.3m 2/14/2013
278.0-0.3m 4/29/2014
Tower-0.3m 2/5/2013
Tower-0.3m 6/3/2013
Tower-0.3m 10/14/2013
Tower-0.3m 2/4/2014
Tower-0.3m 4/29/2014
Tower-0.3m 6/2/2014
Beryllium Chloride
µg/L mg/L
6.5 230
N/A 300
Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total
N/A <1 N/A 15 N/A N/A <50 N/A <1 N/A 4.09 5 N/A <1 N/A N/A
N/A <1 15.2 N/A N/A N/A 38.7 N/A <1 3.77 N/A 6 N/A <1 N/A N/A
N/A 1.1 17.2 N/A N/A N/A 50.6 N/A <1 4.47 N/A 7 N/A <1 N/A N/A
N/A <1 13 N/A N/A 55 61.2 N/A <1 4.4 N/A 7.3 N/A <1 N/A N/A
N/A <1 18 N/A N/A N/A 66.4 N/A <1 4.75 N/A 7.4 N/A <1 N/A N/A
N/A <1 14 N/A N/A N/A 66.2 N/A <1 4.28 N/A 7.5 N/A <1 N/A N/A
N/A <1 14 N/A N/A N/A 56.9 N/A <1 4.17 N/A 6.8 N/A <1 N/A N/A
N/A <1 15 N/A N/A 55 N/A N/A <1 4.32 N/A 6.7 N/A <1 N/A N/A
N/A <1 N/A N/A N/A N/A 36.7 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 45.2 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 65.9 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 60.4 N/A <1 N/A 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 <1 N/A N/A N/A N/A <1 N/A N/A
N/A <1 14 N/A N/A N/A 63.4 N/A <1 4.29 N/A 7.6 N/A <1 N/A N/A
N/A <1 14 N/A N/A N/A 54.6 N/A <1 4.13 N/A 6.8 N/A <1 N/A N/A
N/A <1 15 N/A N/A 56 N/A N/A <1 4.39 N/A 6.8 N/A <1 N/A N/A
N/A <1 N/A 14 N/A N/A <50 N/A <1 N/A 4.06 4.9 N/A <1 N/A N/A
17.1 19.2 131 133 N/A 177 175 <1 <1 9.91 9.86 7 <5 <5 N/A N/A
N/A 57.8 N/A 179 N/A N/A 357 N/A <1 N/A 14.8 6.9 N/A <5 N/A N/A
N/A 68.2 N/A 176 N/A N/A 406 N/A <1 N/A 15 7 N/A <5 N/A N/A
1.93 2.7 146 147 N/A 319 312 <1 <1 15.1 15.4 5.6 <5 <5 N/A N/A
N/A 7.41 N/A 129 N/A N/A 294 N/A <1 N/A 15.3 5 N/A <1 N/A N/A
N/A 9.85 N/A 127 N/A N/A 293 N/A <1 N/A 15.1 5.2 N/A <5 N/A N/A
200.8 200.7 200.7 200.8
1000 2NE
200.8 200.7 200.7
3
µg/L mg/L µg/L µg/L
Cadmium Calcium Chromium CobaltBoronArsenicBarium
µg/L µg/L µg/L
NE 5010
Tables - Page 27
TABLE 6- SURFACE WATER ANALYTICAL RESULTS
Analytical Parameter
Units
15A NCAC 02B .0200 Surface Water Quality Standard (WS Waters)
Analytical Method
Well Name Sample Collection Date
277.5-0.3M 4/29/2014
277.6-0.3m 2/25/2010
277.6-0.3m 8/4/2010
277.6-0.3m 2/9/2011
277.6-0.3m 8/3/2011
277.6-0.3m 2/2/2012
277.6-0.3m 8/2/2012
277.6-0.3m 2/14/2013
278.0-0.3m 2/25/2010
278.0-0.3m 8/4/2010
278.0-0.3m 2/9/2011
278.0-0.3m 8/3/2011
278.0-0.3m 8/30/2011
278.0-0.3m 2/2/2012
278.0-0.3m 8/2/2012
278.0-0.3m 2/14/2013
278.0-0.3m 4/29/2014
Tower-0.3m 2/5/2013
Tower-0.3m 6/3/2013
Tower-0.3m 10/14/2013
Tower-0.3m 2/4/2014
Tower-0.3m 4/29/2014
Tower-0.3m 6/2/2014
Fluoride
mg/L
1.8
Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total
N/A 0.002 <1 N/A 210 N/A <1 N/A 1.78 N/A 20 N/A <0.05 N/A <1
0.001 0.002 0.000 N/A 449 N/A <1 1.63 N/A N/A 18.5 N/A <0.05 N/A N/A
0.001 0.001 0.000 N/A 161 N/A <1 1.82 N/A N/A 32.8 N/A <0.05 N/A N/A
<0.001 0.001 0.000 N/A 133 N/A <1 1.85 N/A N/A 16.5 N/A <0.05 N/A N/A
0.001 0.001 0.000 N/A 75.7 N/A <1 2.17 N/A N/A 33.3 N/A <0.05 N/A N/A
<0.001 <0.001 0.000 N/A 135 N/A <1 2.05 N/A N/A 19.8 N/A <0.05 N/A N/A
<0.001 0.001 0.000 N/A 78.5 N/A <1 1.92 N/A N/A 40.7 N/A <0.05 N/A N/A
<0.001 0.001 0.000 N/A 231 N/A <1 1.96 N/A N/A 24.7 N/A <0.05 N/A N/A
N/A N/A 0.000 N/A 451 N/A N/A N/A N/A N/A 15.6 N/A N/A N/A N/A
N/A N/A 0.000 N/A 108 N/A N/A N/A N/A N/A 36.5 N/A N/A N/A N/A
N/A N/A 0.000 N/A 114 N/A N/A N/A N/A N/A 15.2 N/A N/A N/A N/A
N/A 0.001 0.000 N/A 76.7 N/A <1 N/A N/A N/A 41.2 N/A N/A N/A N/A
N/A 0.001 0.000 N/A 74.6 N/A <1 N/A N/A N/A 46.7 N/A <0.05 N/A N/A
<0.001 <0.001 0.000 N/A 89.6 N/A <1 2.06 N/A N/A 13.1 N/A <0.05 N/A N/A
<0.001 0.001 0.000 N/A 84.3 N/A <1 1.91 N/A N/A 48.1 N/A <0.05 N/A N/A
<0.001 0.001 0.000 N/A 240 N/A <1 1.97 N/A N/A 28 N/A <0.05 N/A N/A
N/A 0.002 <1 N/A 132 N/A <1 N/A 1.77 N/A 14 N/A <0.05 N/A <1
<0.005 <0.005 0.000 <10 59 <1 <1 2.51 2.51 12 17 N/A <0.05 N/A N/A
N/A <0.005 0.000 N/A 32 N/A <1 N/A 3.01 N/A 15 N/A <0.05 N/A N/A
N/A <0.005 0.000 N/A 44 N/A <1 N/A 3.2 N/A 32 N/A <0.05 N/A N/A
<0.005 <0.005 0.000 <10 70 <1 <1 3.15 3.25 155 156 N/A <0.05 N/A N/A
N/A 0.003 <1 N/A 51 N/A <1 N/A 3.13 N/A 123 N/A <0.05 N/A 22.7
N/A <0.005 0.000 N/A 23 N/A <1 N/A 3.03 N/A 39 N/A <0.05 N/A N/A
200.8200.7 200.7 200.8 200.7 200.8
160NE7100025
mg/L µg/L µg/L µg/L µg/L µg/L µg/L
Copper Iron Lead Magnesium Manganese Mercury Molybdenum
245.1
200 0.012
Tables - Page 28
TABLE 6- SURFACE WATER ANALYTICAL RESULTS
Analytical Parameter
Units
15A NCAC 02B .0200 Surface Water Quality Standard (WS Waters)
Analytical Method
Well Name Sample Collection Date
277.5-0.3M 4/29/2014
277.6-0.3m 2/25/2010
277.6-0.3m 8/4/2010
277.6-0.3m 2/9/2011
277.6-0.3m 8/3/2011
277.6-0.3m 2/2/2012
277.6-0.3m 8/2/2012
277.6-0.3m 2/14/2013
278.0-0.3m 2/25/2010
278.0-0.3m 8/4/2010
278.0-0.3m 2/9/2011
278.0-0.3m 8/3/2011
278.0-0.3m 8/30/2011
278.0-0.3m 2/2/2012
278.0-0.3m 8/2/2012
278.0-0.3m 2/14/2013
278.0-0.3m 4/29/2014
Tower-0.3m 2/5/2013
Tower-0.3m 6/3/2013
Tower-0.3m 10/14/2013
Tower-0.3m 2/4/2014
Tower-0.3m 4/29/2014
Tower-0.3m 6/2/2014
Nitrate as N Strontium Sulfate TDS TOC
mg-N/L mg/L mg/L mg/L mg/L
10 14 250 500 NE
300.0 N/A 300.0 2540C 5310B
Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Total Total Total Dissolved Total Total
N/A <1 N/A N/A N/A N/A <1 N/A N/A N/A 3.9 39 N/A <0.2 N/A
N/A <1 N/A 1.67 N/A N/A <1 3.57 N/A N/A 4.5 24 N/A N/A N/A
N/A <1 N/A 1.73 N/A N/A <1 4.02 N/A N/A 4.7 <50 N/A N/A N/A
N/A <1 N/A 1.65 N/A N/A <1 4.06 N/A N/A 4.2 41 N/A N/A N/A
N/A <1 N/A 2.09 N/A N/A <1 5.25 N/A N/A 4.5 49 N/A N/A N/A
N/A <1 N/A 1.8 N/A N/A <1 4.7 N/A N/A 4.2 49 N/A N/A N/A
N/A <1 N/A 1.76 N/A N/A <1 4.45 N/A N/A 4.1 43 N/A N/A N/A
N/A <1 N/A 1.85 N/A N/A <1 4.47 N/A N/A 4 49 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 41 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 4.1 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 4.2 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 4.4 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 51 N/A N/A N/A
N/A <1 N/A 1.81 N/A N/A <1 4.72 N/A N/A 4.3 52 N/A N/A N/A
N/A <1 N/A 1.75 N/A N/A <1 4.41 N/A N/A 4.1 42 N/A N/A N/A
N/A <1 N/A 1.86 N/A N/A <1 4.5 N/A N/A 4 51 N/A N/A N/A
N/A <1 N/A N/A N/A N/A <1 N/A N/A N/A 3.8 38 N/A <0.2 N/A
6 6 <0.023 3.28 3.3 <1 <1 5.38 5.38 N/A 28 78 0.67 0.672 N/A
N/A <5 <0.023 N/A 4.58 N/A <1 N/A 6.19 N/A 41 89 N/A 0.845 N/A
N/A <5 <0.023 N/A 5 N/A 1.03 N/A 6.04 N/A 42 100 N/A 0.21 N/A
24 24 0.07 5.03 5.03 <1 <1 5.45 5.38 N/A 59 110 0.76 0.75 N/A
N/A 21 N/A N/A N/A N/A <1 N/A N/A N/A 55 95 N/A 0.917 N/A
N/A 19 <0.023 N/A 4.52 N/A 1.05 N/A 4.85 N/A 56 97 N/A 0.876 N/A
200.7 200.8 200.7 200.8200.7
25 0.245NE
mg/L µg/L mg/L µg/L
NE
µg/L
Potassium Selenium Sodium ThalliumNickel
Tables - Page 29
TABLE 6- SURFACE WATER ANALYTICAL RESULTS
Analytical Parameter
Units
15A NCAC 02B .0200 Surface Water Quality Standard (WS Waters)
Analytical Method
Well Name Sample Collection Date
277.5-0.3M 4/29/2014
277.6-0.3m 2/25/2010
277.6-0.3m 8/4/2010
277.6-0.3m 2/9/2011
277.6-0.3m 8/3/2011
277.6-0.3m 2/2/2012
277.6-0.3m 8/2/2012
277.6-0.3m 2/14/2013
278.0-0.3m 2/25/2010
278.0-0.3m 8/4/2010
278.0-0.3m 2/9/2011
278.0-0.3m 8/3/2011
278.0-0.3m 8/30/2011
278.0-0.3m 2/2/2012
278.0-0.3m 8/2/2012
278.0-0.3m 2/14/2013
278.0-0.3m 4/29/2014
Tower-0.3m 2/5/2013
Tower-0.3m 6/3/2013
Tower-0.3m 10/14/2013
Tower-0.3m 2/4/2014
Tower-0.3m 4/29/2014
Tower-0.3m 6/2/2014
TOX TSS
µg/L mg/L
NE NE
2450D
Total Total Dissolved Total
N/A <5 N/A <0.005
N/A N/A N/A 0.003
N/A N/A N/A 0.004
N/A N/A N/A <0.002
N/A N/A N/A <0.002
N/A N/A N/A <0.002
N/A N/A N/A <0.001
N/A N/A N/A 0.002
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A <0.002
N/A N/A N/A <0.002
N/A N/A N/A <0.002
N/A N/A N/A <0.001
N/A N/A N/A 0.002
N/A <5 N/A <0.005
N/A N/A 0.01 0.011
N/A N/A N/A <0.005
N/A N/A N/A <0.005
N/A N/A 0.092 0.097
N/A <5 N/A 0.07
N/A N/A N/A 0.035
200.7
0.05
mg/L
Zinc
Tables - Page 30
Notes:
1.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
2.Units:
˚C = Degrees Celsius
SU = Standard Units
mV = millivolts
NTU = Nephelometric Turbidity Unit
mg/L = milligrams per liter
µg/L = micrograms per liter
µmhos/cm = micromhos per centimeter
CaCO3 = calcium carbonate
HCO3
- = bicarbonate
CO3
2- = 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 31
Table 7 - Seep Analytical Results
Analytical Parameter Temp.Cond.pH Aluminum Antimony Arsenic Barium Beryllium Boron Cadmium Calcium COD Chloride Chromium Cobalt Copper Flow Fluoride
Units ˚C µmhos/cm SU µg/L µg/L µg/L mg/L µg/L mg/L µg/L mg/L mg/L mg/L µg/L µg/L mg/L MGD mg/L
15A NCAC 02B .0200 Surface Water Quality Standard NE NE 6.0 - 9.0 0.087 5.6 10 1 6.5 NE 2 NE NE 230 50 3 0.007 N/A 1.8
Analytical Method 200.7 200.8 200.8 200.7 N/A 200.7 200.8 200.7 HACH 8000 300 200.7 200.8 200.7 N/A 300.0
Site Name Sample Collection Date
S-1 4/29/2014 15.81 207 5.9 0.115 <1 <1 0.05 N/A 0.089 <1 14.2 N/A 4.6 <1 N/A <0.001 0.00056 <1
S-3 4/29/2014 16.75 150 5.57 0.065 <1 <1 0.091 N/A 0.349 <1 10.5 N/A 7.3 <1 N/A <0.001 0.00562 <1
S-4 4/29/2014 15.84 133 7.98 0.193 <1 <1 0.043 N/A 0.361 <1 6.83 N/A 6.6 <1 N/A <0.001 0.01754 <1
S-5 4/29/2014 16.49 134 6.29 0.394 <1 <1 0.059 N/A 0.443 <1 5.14 N/A 7 <1 N/A <0.001 0.00287 <1
S-6 4/29/2014 16.59 104 7.62 0.022 <1 <1 0.017 N/A 0.154 <1 2.94 N/A 6.3 <1 N/A <0.001 0.02085 <1
S-7 4/29/2014 15.71 70 6.62 0.159 <1 <1 0.024 N/A 0.082 <1 3.76 N/A 5.2 <1 N/A <0.001 0.0332 <1
S-8 4/29/2014 17.23 83 6.76 0.216 <1 <1 0.019 N/A <0.05 <1 7.49 N/A 2.7 <1 N/A <0.001 0.0245 <1
S-9 4/29/2014 16.01 126 6.38 0.366 <1 <1 0.043 N/A 0.388 <1 6.33 <20 6.7 <1 N/A <0.001 0.01206 <1
S-11 4/29/2014 15.56 95.2 5.9 0.047 <1 <1 0.027 N/A 0.259 <1 3.55 <20 5.9 <1 N/A <0.001 0.00835 <1
S-12 4/29/2014 17.53 129.3 6.02 0.029 <1 <1 0.098 N/A 0.242 <1 3.32 <20 7 <1 N/A 0.00158 0.00568 <1
277.5 4/29/2014 17.96 57.9 7.19 0.237 <1 <1 0.015 N/A <0.05 <1 4.09 <20 5 <1 N/A 0.00163 N/A <1
278 4/29/2014 17.99 57.7 7.21 0.158 <1 <1 0.014 N/A <0.05 <1 4.06 <20 4.9 <1 N/A 0.00168 N/A <1
Tables - Page 32
Table 7 - Seep Analytical Results
Analytical Parameter
Units
15A NCAC 02B .0200 Surface Water Quality Standard
Analytical Method
Site Name Sample Collection Date
S-1 4/29/2014
S-3 4/29/2014
S-4 4/29/2014
S-5 4/29/2014
S-6 4/29/2014
S-7 4/29/2014
S-8 4/29/2014
S-9 4/29/2014
S-11 4/29/2014
S-12 4/29/2014
277.5 4/29/2014
278 4/29/2014
Hardness Iron Lead Magnesium Manganese Mercury Molybdenum Nickel Nitrate as N Oil and Grease Potassium Selenium Sodium Strontium Sulfate TDS Thallium
mg/L as CaCO3 µg/L µg/L mg/L mg/L µg/L µg/L µg/L mg-N/L mg/L mg/L µg/L mg/L N/A mg/L mg/L µg/L
100 1000 25 NE 200 0.012 160 25 10 see note 3 NE 5 NE 14 250 500 0.24
200.7 200.7 200.8 200.7 200.8 245.1 200.8 200.7 300.0 1664B 200.7 200.8 200.7 N/A 300.0 2540C 200.8
58.8 6510 <1 5.68 1.03 <0.05 <1 <1 N/A N/A N/A <1 N/A N/A 63 140 <0.2
40.6 140 <1 3.48 0.841 <0.05 <1 8.77 N/A N/A N/A <1 N/A N/A 49 90 <0.2
41.9 539 <1 6.04 0.429 <0.05 <1 <1 N/A N/A N/A <1 N/A N/A 31 88 <0.2
37.1 1030 <1 5.89 0.282 <0.05 <1 2.47 N/A N/A N/A <1 N/A N/A 38 86 <0.2
31.5 293 <1 5.87 1 <0.05 <1 1 N/A N/A N/A <1 N/A N/A 20 66 <0.2
26.1 880 <1 4.05 0.345 <0.05 <1 2.07 N/A N/A N/A <1 N/A N/A 3.1 51 <0.2
29.3 2150 <1 2.58 0.028 <0.05 <1 <1 N/A N/A N/A <1 N/A N/A 1.5 81 <0.2
39.6 720 <1 5.77 0.208 <0.05 <1 1.48 N/A <5 N/A <1 N/A N/A 30 84 <0.2
21.4 472 <1 3.04 1.23 <0.05 <1 1.1 N/A <5 N/A <1 N/A N/A 26 56 <0.2
33 374 <1 6 1.14 <0.05 <1 6.33 N/A <5 N/A <1 N/A N/A 41 78 <0.2
17.5 210 <1 1.78 0.02 <0.05 <1 <1 N/A <5 N/A <1 N/A N/A 3.9 39 <0.2
17.4 132 <1 1.77 0.014 <0.05 <1 <1 N/A <5 N/A <1 N/A N/A 3.8 38 <0.2
Tables - Page 33
Table 7 - Seep Analytical Results
Analytical Parameter
Units
15A NCAC 02B .0200 Surface Water Quality Standard
Analytical Method
Site Name Sample Collection Date
S-1 4/29/2014
S-3 4/29/2014
S-4 4/29/2014
S-5 4/29/2014
S-6 4/29/2014
S-7 4/29/2014
S-8 4/29/2014
S-9 4/29/2014
S-11 4/29/2014
S-12 4/29/2014
277.5 4/29/2014
278 4/29/2014
TOC TSS Zinc
mg/L mg/L mg/L
NE NE 0.05
5310B 2450D 200.7
N/A 11 <0.005
N/A <5 0.019
N/A <5 <0.005
N/A 9 <0.005
N/A <5 <0.005
N/A 7 <0.005
N/A <5 <0.005
N/A 11 <0.005
N/A <5 <0.005
N/A <5 0.018
N/A <5 <0.005
N/A <5 <0.005
Tables - Page 34
Table 7 - Seep Analytical Results
Notes:
1.Analytical parameter abbreviations:
Temp. = Temperature
Cond. = Specific conductivity
TDS = Total dissolved solids
TSS = Total suspended solids
2.Units:
˚C = Degrees Celsius
SU = Standard Units
µmhos/cm = micromhos per centimeter
mg/L = milligrams per liter
µg/L = micrograms per liter
CaCO3 = calcium carbonate
3.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
4.N/A = Not applicable
5.NE = Not established
6.Flow measurements and analytical samples were collected on April 29, 2014.
7.Flow was not exhibited at S-10 during the time of seep sampling
8.Highlighted values indicate values that exceed the 15A NCAC 2B Standard
9.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 35
TABLE 8 – ENVIRONMENTAL EXPLORATION AND SAMPLING PLAN
RIVERBEND STEAM STATION
Exploration
Area
Soil Borings Shallow Monitoring Wells Deep Monitoring Wells Bedrock Monitoring Wells Water Supply Wells Surface Water/Sediment
Boring IDs Quantity
Estimated
Boring Depth
(ft bgs)
Well IDs Quantity
Estimated
Well Depth
(ft bgs)
Screen
Length
(ft)
Well IDs Quantity
Estimated
Casing
Depth
(ft bgs)
Estimated
Well
Depth
(ft bgs)
Screen
Length
(ft)
Well IDs Quantity
Estimated
Casing
Depth
(ft bgs)
Estimated
Well
Depth
(ft bgs)
Screen
Length
(ft)
Well IDs Quantity Quantity of
Locations
Quantity of
Samples
Ash Basin
AB-1
through
AB-8
8 75 - 125
AB-1S through
AB-8S, AB-
5SL and AB-
7SL
10 20-80 15 AB-1D through AB-
8D 8 40-60 55-75 5 AB-3BR 1 70-100 100-150 5 N/A N/A
2 Surface
Water
Locations
4
Ash
Storage/
Cinder
Storage
AS-1
through
AS-3, C-1
and C-2
5 80 - 100
AS-1S through
AS-3S, C-1S
and C-2S
5 30-80 15 AS-1D through AS-
3D, C-1D and C-2D 5 40-90 55-105 5 N/A N/A N/A N/A N/A N/A N/A N/A N/A
Beyond
Waste
Boundary
GWA-1
through
GWA-10,
OB-1 and
OB-2
12 50 – 80
GWA-1S
through GWA-
10S, OB-1 and
OB-2
12 15-45 10-15 GWA-1D through
GWA-10D 10 25-125 40-140 5
GWA-2BR,
GWA-4BR,
GWA-7BR
GWA-9BR,
MW -7BR
5 45-105 95-155 5
Existing
Water
Supply
Wells
3 13
13 Seeps
13
Sediment
Background
BG-1, BG-
2, and BG-
3
3 30-100
BG-1S, BG-
2S, and BG-
3S
3 20-60 10-15 BG-1D, BG-2D, and
BG-3D 3 30-125 40-140 5 BG-2BR 1 45-105 115-180 5 N/A N/A N/A N/A
Potential
Additional
Beyond
Waste
Boundary
GWA-20
through
GWA-23
4 80-100
GWA-20S
through GWA-
23S
4 30-80 10-15 GWA-20D through
GWA-23D 4 40-90 55-105 5
GWA-
20BR,
GWA-
23BR
4 45-105 95-155 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 9 and 10.
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.
Tables - Page 36
TABLE 9 – 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 (Total) 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/7471B
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 37
TABLE 10 – 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 ºC 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 µg/L EPA 200.7 or 6010C
Antimony 1 µg/L EPA 200.8 or 6020A
Arsenic 1 µg/L EPA 200.8 or 6020A
Barium 5 µg/L EPA 200.7 or 6010C
Beryllium 1 µg/L EPA 200.8 or 6020A
Boron 50 µg/L EPA 200.7 or 6010C
Cadmium 1 µg/L EPA 200.8 or 6020A
Chromium 1 µg/L EPA 200.7 or 6010C
Cobalt 1 µg/L EPA 200.8 or 6020A
Copper 0.005 mg/L EPA 200.7 or 6010C
Iron 10 µg/L EPA 200.7 or 6010C
Lead 1 µg/L EPA 200.8 or 6020A
Manganese 5 µg/L EPA 200.7 or 6010C
Mercury (low level) 0.012 µg/L EPA 245.7 or 1631
Molybdenum 5 µg/L EPA 200.7 or 6010C
Nickel 5 µg/L EPA 200.7 or 6010C
Selenium 1 µg/L EPA 200.8 or 6020A
Strontium 5 µg/L EPA 200.7 or 6010C
Thallium (low level) 0.2 µg/L EPA 200.8 or 6020A
Vanadium (low level) 0.3 mg/L EPA 200.8 or 6020A
Zinc 5 µg/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
Methane 0.1 mg/L RSK 175
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
Sulfide (as H2S) 4 0.05 mg/L SM4500S-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 Speciation (Fe(II), Fe(III) Vendor Specific µg/L IC-ICP-CRC-MS
Manganese Speciation (Mn(II), Mn(IV) Vendor Specific µg/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-13 and BG-1S/D
5.Sulfide (as H2S) will be analyzed for groundwater samples only.
6.All EPA methods and RLs are at or below the respective 2L or 2B Standard for constituents with standards.
Tables - Page 38
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.
A-1
A-2
A-3
A-4
A-5
A-6
A-7
A-8
A-9
A-10
A-11
A-12
A-13
A-14
Appendix B
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.
B-1
B-2
B-3
B-4
B-5
B-6
B-7
B-8
B-9
B-10
B-11
Appendix C
Site Plan with Cross-sections Riverbend
Steam Station Ash Basin Duke Energy
Carolinas, LLC Gaston County, NC, Figures
4.1-3, 4.1-4, and 4.1-5, May 31, 2013; Cross-
sections A-A’, B-B’, C-C’
Y
CAN W-v
J
Y
NOTES:
1. PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE.
2. ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE.
3. AS -BUILT MONITORING WELL LOCATIONS PROVIDED BY DUKE ENERGY. SOIL BORING AND PIEZOMETER LOCATIONS FROM DUKE ENERGY DRAWINGS RB-3011 AND RB-3010A.
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 WAS OBTAINED FROM NC DOT GEOGRAPHIC INFORMATION SYSTEM (GIS) WEB SITE.
7. ORTHOPHOTOGRAPHY WAS OBTAINED FROM NC ONEMAP GIS WEB SITE (DATED 2009).
8. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107 (a).
�I
'" r "
F� 51� f
ut �
L 6 ry t
LEGEND:
PROPERTY BOUNDARY
COMPLIANCE BOUNDARY
COMPLIANCE BOUNDARY COINCIDENT
WITH DUKE ENERGY PROPERTY BOUNDARY
WASTE BOUNDARY
ASH OR CINDER STORAGE AREA
TOPOGRAPHIC CONTOUR
COMPLIANCE GROUNDWATER MONITORING WELL
-
VOLUNTARY GROUNDWATER MONITORING WELL
­UBEACHROADSOIL
BORING
7
I
PIEZOMETER
SCALE (FEET)
Q n
r
J00'
0 300 600'
P = 600'
HDR Engineering, Inc.
n me�e.aun.x
SITE PLAN WITH CROSS SECTIONS
RIVERBEND STEAM STATION ASH BASIN
DUKE ENERGY CAROLINAS, LLC
GASTON COUNTY, NC
DATE
MAY 31, 20t
FIGURE
4.1
-� L

MAY 31, 2013
MAY 31, 2013