HomeMy WebLinkAboutBuck Revised GWAP_12 30 2014
Buck Combined Cycle Station Ash Basin
Proposed Groundwater
Assessment Work Plan
(Rev. 1)
NPDES Permit NC0004774
December 30, 2014
Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Buck Combined Cycle 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 Dry Ash Storage Area ..................................................................................12
5.2 Source Characteristics .............................................................................................12
5.3 Hydrogeologic Site Characteristics ..........................................................................14
6.0 Compliance Groundwater Monitoring ..................................................................................17
7.0 Assessment Work Plan .......................................................................................................18
7.1 Subsurface Exploration ............................................................................................19
7.1.1 Ash and Soil Borings ....................................................................................19
7.1.2 Shallow Monitoring Wells .............................................................................22
7.1.3 Deep Monitoring Wells .................................................................................23
7.1.4 Bedrock Monitoring Wells .............................................................................24
7.1.5 Well Completion and Development ..............................................................24
7.1.6 Hydrogeologic Evaluation Testing ................................................................25
7.2 Groundwater Sampling and Analysis .......................................................................26
7.2.1 Compliance and Voluntary Monitoring Wells ................................................27
7.2.2 Onsite Water Supply Well ............................................................................28
7.2.3 Speciation of Select Inorganics ....................................................................28
7.3 Surface Water, Sediment, and Seep Sampling ........................................................28
7.3.1 Surface Water Samples ...............................................................................28
7.3.2 Sediment Samples .......................................................................................29
7.3.3 Seep Samples ..............................................................................................29
7.4 Field and Sampling Quality Assurance/Quality Control Procedures .........................30
Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
Table of Contents
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7.4.1 Field Logbooks .............................................................................................30
7.4.2 Field Data Records ......................................................................................30
7.4.3 Sample Identification ....................................................................................30
7.4.4 Field Equipment Calibration .........................................................................31
7.4.5 Sample Custody Requirements ....................................................................31
7.4.6 Quality Assurance and Quality Control Samples ..........................................33
7.4.7 Decontamination Procedures .......................................................................33
7.5 Site Hydrogeologic Conceptual Model .....................................................................34
7.6 Site-Specific Background Concentrations ................................................................35
7.7 Groundwater Fate and Transport Model ..................................................................35
7.7.1 MODFLOW/MT3DMS Model ........................................................................36
7.7.2 Development of Kd Terms ............................................................................37
7.7.3 MODFLOW/MT3DMS Modeling Process .....................................................38
7.7.4 Hydrostratigraphic Layer Development ........................................................40
7.7.5 Domain of Conceptual Groundwater Flow Model .........................................40
7.7.6 Boundary Conditions for Conceptual Groundwater Flow Model ....................41
7.7.7 Groundwater Impacts to Surface Water .......................................................41
8.0 Risk Assessment.................................................................................................................43
8.1 Human Health Risk Assessment ..............................................................................43
8.1.1 Site-Specific Risk-Based Remediation Standards ........................................44
8.2 Ecological Risk Assessment ....................................................................................45
9.0 CSA Report .........................................................................................................................48
10.0 Proposed Schedule ...........................................................................................................50
11.0 References ........................................................................................................................51
Appendix A – Notice of Regulatory Requirements Letter from John E. Skvarla, III, Secretary,
State of North Carolina, to Paul Newton, Duke Energy, dated August 13, 2014.
Appendix B – Site Plan for Modeling Cross Sections Buck Steam Station Ash Basin Duke
Energy Carolinas, LLC Rowan County, NC, Figure 4, March 10, 2014 DRAFT;
Cross Sections A-A’, B-B’, C-C’
Appendix C – Review of Groundwater Assessment Work Plan Letter from S. Jay Zimmerman,
Chief, Water Quality Regional Operations Section, NCDENR, To Harry Sideris,
Duke Energy, dated November 4, 2014.
Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Buck Combined Cycle 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. Soil and Ash Analytical Results
6. Surface Water Analytical Results
7. Ash Basin Pore Water Analytical Results
8. Seep Analytical Results
9. Environmental Exploration and Sampling Plan
10. Soil and Ash Parameters and Constituent Analytical Methods
11. Groundwater, Surface Water, and Seep Parameters and Constituent Analytical Methods
Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
EXECUTIVE SUMMARY
ES-1
Executive Summary
Duke Energy Carolinas, LLC (Duke Energy), owns and formerly operated the Buck Steam
Station (BSS), located on the Yadkin River in Rowan County near the town of Salisbury, North
Carolina (see Figure 1). BSS began operation in 1926 as a coal-fired generating station. The
Buck Combined Cycle Station (BCCS) natural gas facility was constructed at the site and began
operating in late-2011. Subsequently, the BSS was decommissioned and taken offline in
April 2013. The coal ash residue from BSS’s coal combustion process was historically disposed
of in the station’s ash basin located adjacent to the station and the Yadkin River. The discharge
from the ash basin is permitted by the North Carolina Department of Environment and Natural
Resources (NCDENR) Division of Water Resources (DWR) under the National Pollutant
Discharge Elimination System (NPDES) Permit NC0004774.
Duke Energy has performed voluntary groundwater monitoring around the ash basin from
November 2006 until May 2010. The voluntary groundwater monitoring wells were sampled two
times each year and the analytical results were submitted to DWR. Groundwater monitoring as
required by the NPDES permit began in March 2011. The system of compliance groundwater
monitoring wells required for the NPDES permit is sampled three times a year and the analytical
results are submitted to the DWR. The compliance groundwater monitoring is performed in
addition to the normal NPDES monitoring of the discharge flows from the ash basin.
It is Duke Energy’s intention that the assessment will collect additional data to validate and
expand the knowledge of the groundwater system at the ash basin. The proposed assessment
plan will provide the basis for a data-driven approach to additional actions related to
groundwater conditions if required by the results of the assessment and for closure.
On August 13, 2014, NCDENR issued a Notice of Regulatory Requirements (NORR) letter to
Duke Energy, pursuant to Title 15A North Carolina Administrative Code Chapter (15A NCAC)
02L.0106. The NORR stipulates that for each coal-fueled plant owned, Duke Energy will
conduct a comprehensive site assessment (CSA) that includes a Groundwater Assessment
Work Plan (Work Plan) and a receptor survey. In accordance with the requirements of the
NORR, HDR completed a receptor survey to identify all receptors within a 0.5-mile radius (2,640
feet) of the BCCS ash basin compliance boundary. This receptor survey also addressed the
requirements of the General Assembly of North Carolina Session 2013 Senate Bill 729 Ratified
Bill (SB 729). Similar requirements to perform a groundwater assessment are found in SB 729,
which revised North Carolina General Statute 130A-309.209(a).
In accordance with the NORR, Duke Energy submitted a Groundwater Assessment Work Plan
(GAWP) to the NCDENR on September 25, 2014. Subsequent to their review, the NCDENR
provided comments to the GAWP in a letter dated November 4, 2014. The letter included
general comments that pertained to each of the work plans prepared for Duke Energy’s 14 coal
ash sites in North Carolina, as well as comments specific to the BSS work plan and site. This
Revised GWAP has been prepared to address the general and site-specific comments made by
NCDENR in the November 4, 2014 letter.
Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
EXECUTIVE SUMMARY
ES-2
Soil and groundwater sampling will be performed to provide information pertaining to the
horizontal and vertical extent of potential soil and groundwater contamination. This will be
performed by sampling existing wells, installing and sampling approximately 22 nested
monitoring well pairs (shallow and deep), 5 deep (only) monitoring wells (located adjacent to
existing shallow wells), 4 bedrock monitoring wells, and collecting soil and ash samples. This
work will provide information on the chemical and physical characteristics of site soils and ash,
as well as the geological and hydrogeological features of the site that influence groundwater
flow and direction and transport of constituents from the ash basin and ash storage area.
Samples of ash basin surface water will be collected and used to evaluate potential impacts to
groundwater and surface water. Seep samples will be collected from locations identified in July
and August 2014 (as part of Duke Energy’s NPDES permit renewal application) to evaluate
potential impacts to groundwater and surface water. In addition, surface water and sediment
samples will be collected from a stream located west of the ash basin to evaluate potential
impacts from the ash basin.
The information obtained through implementation of this Work Plan will be utilized to prepare a
CSA report in accordance with the requirements of the NORR. If it is determined that additional
investigations are required during the review of existing data or data developed from this
assessment, Duke Energy and HDR will notify the NCDENR regional office prior to initiating
additional sampling or investigations.
HDR will also perform an assessment of risks to human health and safety and to the
environment. This assessment will include the preparation of a conceptual site model
illustrating potential pathways from the source to possible receptors.
Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
1.0 INTRODUCTION
1
1.0 Introduction
Duke Energy Carolinas, LLC (Duke Energy), owns and formerly operated the Buck Steam
Station (BSS), located on the Yadkin River in Rowan County near the town of Salisbury, North
Carolina (see Figure 1). BSS began operation in 1926 as a coal-fired generating station. The
Buck Combined Cycle Station (BCCS) natural gas facility was constructed at the site and began
operating in late-2011. Subsequently, the BSS was decommissioned and taken offline in April
2013. The coal ash residue from BSS’s coal combustion process was historically disposed of in
the station’s ash basin located adjacent to the station and the Yadkin River. The discharge from
the ash basin is permitted by the North Carolina Department of Environment and Natural
Resources (NCDENR) Division of Water Resources (DW R) under the National Pollutant
Discharge Elimination System (NPDES) Permit NC0004774.
Duke Energy has performed voluntary groundwater monitoring around the ash basin from
November 2006 until May 2010. The voluntary groundwater monitoring wells were sampled two
times each year and the analytical results were submitted to DWR. Groundwater monitoring as
required by the NPDES permit began in March 2011. The system of compliance groundwater
monitoring wells required for the NPDES permit is sampled three times a year and the analytical
results are submitted to the DWR. The compliance groundwater monitoring is performed in
addition to the normal NPDES monitoring of the discharge flows from the ash basin.
It is Duke Energy’s intention that the assessment will collect additional data to validate and
expand the knowledge of the groundwater system at the ash basin. The proposed assessment
plan will provide the basis for a data-driven approach to additional actions related to
groundwater conditions if required by the results of the assessment and for closure.
On August 13, 2014, NCDENR issued a Notice of Regulatory Requirements (NORR) letter to
Duke Energy, pursuant to Title 15A North Carolina Administrative Code (15A NCAC) Chapter
02L.0106. The NORR stipulates that for each coal-fueled plant owned, Duke Energy will
conduct a comprehensive site assessment (CSA) that includes a Groundwater Assessment
Work Plan (Work Plan) and a receptor survey. In accordance with the requirements of the
NORR, HDR has completed a receptor survey to identify all receptors within a 0.5-mile radius
(2,640 feet) of the BCCS ash basin compliance boundary. The NORR letter is included as
Appendix A.
The Coal Ash Management Act 2014 – General Assembly of North Carolina Senate Bill 729
Ratified Bill (Session 2013) (SB 729) revised North Carolina General Statute 130A-309.209(a)
to require the following:
(a) Groundwater Assessment of Coal Combustion Residuals Surface
Impoundments. – The owner of a coal combustion residuals surface
impoundment shall conduct groundwater monitoring and assessment as provided
in this subsection. The requirements for groundwater monitoring and assessment
set out in this subsection are in addition to any other groundwater monitoring and
assessment requirements applicable to the owners of coal combustion residuals
surface impoundments.
Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
1.0 INTRODUCTION
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(1) No later than December 31, 2014, the owner of a coal combustion
residuals surface impoundment shall submit a proposed Groundwater
Assessment Plan for the impoundment to the Department for its review
and approval. The Groundwater Assessment Plan shall, at a minimum,
provide for all of the following:
a. A description of all receptors and significant exposure pathways.
b. An assessment of the horizontal and vertical extent of soil and
groundwater contamination for all contaminants confirmed to be present
in groundwater in exceedance of groundwater quality standards.
c. A description of all significant factors affecting movement and transport
of contaminants.
d. A description of the geological and hydrogeological features influencing
the chemical and physical character of the contaminants.
e. A schedule for continued groundwater monitoring.
f. Any other information related to groundwater assessment required by
the Department.
(2) The Department shall approve the Groundwater Assessment Plan if it
determines that the Plan complies with the requirements of this
subsection and will be sufficient to protect public health, safety, and welfare;
the environment; and natural resources.
(3) No later than 10 days from approval of the Groundwater Assessment
Plan, the owner shall begin implementation of the Plan.
(4) No later than 180 days from approval of the Groundwater Assessment
Plan, the owner shall submit a Groundwater Assessment Report to the
Department. The Report shall describe all exceedances of groundwater
quality standards associated with the impoundment.
This work plan addresses the requirements of 130A-309.209(a)(1) (a) through (f) and the
requirements of the NORR.
On behalf of Duke Energy, HDR submitted to NCDENR a proposed Work Plan for the BSS site
dated September 25, 2014. Subsequently, NCDENR issued a comment letter dated November
4, 2014, containing both general comments applicable to all 14 of Duke Energy ash basin
facilities and site-specific comments for the BSS. In response to these comments, HDR has
prepared this revised Work Plan for performing the groundwater assessment as prescribed in
the NORR. If it is determined that additional investigations are required during the review of
existing data or data developed from this assessment, Duke Energy and HDR will notify the
NCDENR regional office prior to initiating additional sampling or investigations.
HDR will also perform an assessment of risks to human health and safety and to the
environment. This assessment will include the preparation of a conceptual site model
illustrating potential pathways from the source to possible receptors.
The purpose of the work plan contains a description of the activities proposed to meet the
requirements of 15A NCAC 02L .0106(g). This rule requires:
(g) The site assessment conducted pursuant to the requirements of
Paragraph (c) of this Rule, shall include:
(1) The source and cause of contamination;
Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
1.0 INTRODUCTION
3
(2) Any imminent hazards to public health and safety and actions taken
to mitigate them in accordance with Paragraph (f) of this Rule;
(3) All receptors and significant exposure pathways;
(4) The horizontal and vertical extent of soil and groundwater
contamination and all significant factors affecting contaminant
transport; and
(5) Geological and hydrogeological features influencing the movement,
chemical, and physical character of the contaminants.
The work proposed in this plan will provide the information sufficient to satisfy the requirements
of the rule. However, uncertainties may still exist due to the following factors:
The natural variations and the complex nature of the geological and hydrogeological
characteristics involved with understanding the movement, chemical, and physical
character of the contaminants;
The size of the site; and
The time frame mandated by the Coal Ash Management Act (CAMA). Site
assessments are most effectively performed in a multi-phase approach where data
obtained in a particular phase of the investigation can be reviewed and used to refine
the subsequent phases of investigation. The mandated 180-day time frame will prevent
this approach from being utilized.
The 180-day time frame will limit the number of sampling events that can be performed after
well installation and prior to report production. Effectively, this time frame will likely reduce the
number of sampling events within the proposed wells to a single sampling event.
Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
2.0 SITE INFORMATION
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2.0 Site Information
2.1 Plant Description
BSS is a former coal-fired electricity generating facility with a capacity of 256 megawatts located
near the town of Salisbury in Rowan County, North Carolina. As of April 2013, all of the coal-
fired units have been retired. The site is located northwest of Leonard Road; and the
surrounding area generally consists of residential properties, undeveloped land, and the Yadkin
River. Leonard Road generally runs from southwest to northeast in the vicinity of the site and is
located along a topographic divide. The topography at the site generally slopes downward from
that divide toward the Yadkin River.
The station is located on the south bank of the Yadkin River. The site now contains the new
BCCS Plant, a 620-megawatt natural gas-powered electricity generating station. The entire
BSS and BCCS site (Buck site) is approximately 640 acres in area.
2.2 Ash Basin Description
The ash basin system at the plant was used to retain and settle ash generated from coal
combustion at BSS. The ash basin system consists of three cells, the associated earthen dikes,
discharge structures, and two canals. The cells are designated as Cell 1 Additional Primary
Pond (Cell 1), Cell 2 Primary Pond (Cell 2), and Cell 3 Secondary Pond (Cell 3). The ash basin
is located to the south (Cell 1) and southeast (Cells 2 and 3) of the retired Steam Station Units 1
through 6 and the BCCS Plant. The original ash pond at BSS began operation in 1957 and was
formed by constructing a dam across a tributary of the Yadkin River. The footprint of the
original ash pond was the approximate current footprint of Cells 2 and 3. As the ash pond
capacity diminished over time, the original pond was eventually divided into two ash ponds
(Cells 2 and 3) by construction of a separate dike and raising the elevation of a portion of the
earthen dike along the Yadkin River in 1977. Cell 3 and the southern portion of Cell 2 continue
to serve as treatment units for the ash basin system, while trees and other vegetation have
naturally established in the northern portion of Cell 2. Cell 2 contains approximately 1,624,000
cubic yards (or 1,950,000 tons) of coal combustion product (CCP) material, while Cell 3
contains approximately 227,000 cubic yards (or 270,000 tons) of CCP material.
In 1982, additional storage was created by construction of Cell 1, separate from the other cells,
by building a new dike upgradient from Cell 2. Cell 1 contains approximately 2,366,000 cubic
yards (or 2,840,000 tons) of CCP material. In 2009, an area between Cell 1 and Cell 2 was
utilized for storage of dredged ash from Cell 1. This storage area covers approximately 14
acres, contains approximately 209,000 cubic yards of CCP waste, and drains into Cell 1. The
area contained within the waste boundary for Cell 1 encompasses approximately 71 acres. For
purposes of delineating the waste boundary, Cells 2 and 3 are considered a single unit, with the
area contained within this portion of the waste boundary encompassing approximately 80.7
acres. Cell 3 was developed by increasing the elevation of the earthen dike along the Yadkin
River and constructing an intermediate dike across the ash placed in Cell 2. The ash basin
waste boundary is shown on Figures 2 and 3. All three ash basin cells (Cell 1, Cell 2, Cell 3,
Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
2.0 SITE INFORMATION
5
and the ash storage area adjacent to Cell 1) are captured by the existing compliance boundary
shown on Figure 2. Beyond the units described above (Cell 1, Cell 2, Cell 3 and the ash
storage area adjacent to Cell 1), no other CCP waste storage or disposal areas are known to
exist at the Buck site.
Until Cell 1 was constructed, ash generated from the coal combustion process at BSS was
sluiced (via ash discharge lines) into the northern section of Cell 2. Following construction of
Cell 1, discharge of sluiced ash into the ash basins system was rerouted from Cell 2 to the
northern section of Cell 1 (see Figure 2). Flow from Cell 1 enters Cell 2 via the Primary Cell
Discharge Tower. Flow from Cell 2 enters Cell 3 via the Old Primary Cell Discharge Structure.
Flow from Cell 3 discharges to the Yadkin River through the Secondary Cell Discharge Tower.
The approximate pond elevations for the three ash basin cells are: Cell 1 – pond elevation 705
feet; Cell 2 – pond elevation 682 feet; Cell 3 – pond elevation 674 feet. The elevation of the
Yadkin River near the site is approximately 624 feet.
During operation of the coal-fired units, the ash basin system was operated as an integral part
of the site’s wastewater treatment system, receiving variable inflows from the ash removal
system and other permitted discharges. Currently, the ash basin receives variable inflows from
the station yard drain sump, stormwater flows, BSS wastewater, and BCCS wastewater.
The discharge from the ash basin is permitted by the NCDENR DWR under NPDES Permit
NC0004774. Effluent from the ash basin is discharged through the discharge tower, into a
concrete-lined channel, to the Yadkin River.
2.3 Regulatory Requirements
The NPDES program regulates wastewater discharges to surface waters to ensure that surface
water quality standards are maintained. The BSS site is permitted to discharge wastewater
under NPDES Permit NC0004774, which authorizes discharge from the ash basin to the Yadkin
River in accordance with effluent limitations, monitoring requirements, and other conditions set
forth in the permit.
The NPDES permitting program requires that permits be renewed every five years. The most
recent NPDES permit renewal for the BSS site became effective on January 1, 2012, and
expires August 31, 2016.
In addition to surface water monitoring, the NPDES permit requires groundwater monitoring.
Groundwater monitoring has been performed in accordance with the permit conditions
beginning in March 2011. NPDES Permit Condition A (11), Version 1.1, dated June 15, 2011,
lists the groundwater monitoring wells to be sampled, the parameters and constituents to be
measured and analyzed, and the requirements for sampling frequency and reporting results.
These requirements are provided in Table 1.
The compliance boundary for groundwater quality at the BCCS ash basin site is defined in
accordance with Title15A NCAC 02L .0107(a) as being established at either 500 feet from the
waste boundary or at the property boundary, whichever is closer to the waste. The location of
Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
2.0 SITE INFORMATION
6
the ash basin compliance monitoring wells, the ash basin waste boundary, and the compliance
boundary are shown on Figures 2 and 3.
The locations for the compliance groundwater monitoring wells were approved by the NCDENR
DWR Aquifer Protection Section (APS). All compliance monitoring wells included in Table 1 are
sampled three times per year (in March, July, and November). Analytical results are submitted
to the DWR before the last day of the month following the date of sampling for all compliance
monitoring wells.
The compliance groundwater monitoring system for the ash basin consists of the following
monitoring wells: MW -6S, MW -6D, MW -7S, MW-7D, MW -8S, MW -8D, MW-9S, MW -9D, MW -
10D, MW -11S, MW -11D, MW -12S, MW-12D, and/or MW -13D (shown on Figures 2 and 3). All
of the compliance monitoring wells were installed in December 2010.
One or more groundwater quality standards (2L Standards) have been exceeded in
groundwater samples collected at monitoring wells MW -6S, MW -6D, MW-7S, MW -7D, MW -8S,
MW -8D, MW -9S, MW -9D, MW -10D, MW -11S, MW-11D, MW -12S, MW -12D, and/or MW -13D.
Exceedances have occurred for boron, chromium, iron, manganese, pH, sulfate, and total
dissolved solids (TDS). Table 2 presents exceedances measured from March 2011 through
July 2014.
Monitoring wells MW -6S, MW -7S, MW -8S, MW -9S, MW-11S, and MW-12S were installed with
10-foot to 15-foot well screens placed above auger refusal to monitor the shallow aquifer within
the saprolite layer. These wells were installed to total depths ranging from 13.8 feet below
ground surface (bgs) at MW -9S to 21 feet bgs at MW -8S.
Monitoring wells MW -6D, MW -7D, MW -8D, MW -9D, MW-10D, MW -11D, MW-12D, and MW -
13D were installed with 5-foot to 15-foot well screens placed in the uppermost region of the
transition zone. These wells were installed to total depths ranging from 29.2 feet bgs at MW -9D
to 108.5 feet bgs at MW -6D.
Monitoring wells MW -6S and MW -6D are located to the southeast of the Primary Cell at the
compliance boundary and are considered to represent background water quality conditions.
The other ash basin compliance monitoring wells were also installed at or near the compliance
boundary.
Note that monitoring wells MW -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. When the compliance groundwater monitoring program began,
MW -6S and MW -6D were incorporated into the compliance monitoring well system. Voluntary
monitoring wells MW -2S and MW -2D were abandoned during construction of BCCS. No
samples are currently being collected from the voluntary wells. The existing voluntary wells are
shown on Figures 2 and 3.
Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
3.0 RECEPTOR INFORMATION
7
3.0 Receptor Information
The August 13, 2014 NORR states:
No later than October 14th, 2014 as authorized pursuant to 15A NCAC 02L
.0106(g), the DWR is requesting that Duke perform a receptor survey at each of
the subject facilities and submitted to the DWR. The receptor survey is required
by 15A NCAC 02L .0106(g) and shall include identification of all receptors within
a radius of 2,640 feet (one-half mile) from the established compliance boundary
identified in the respective National Pollutant Discharge Elimination System
(NPDES) permits. Receptors shall include, but shall not be limited to, public and
private water supply wells (including irrigation wells and unused or abandoned
wells) and surface water features within one-half mile of the facility compliance
boundary. For those facilities for which Duke has already submitted a receptor
survey, please update your submittals to ensure they meet the requirements
stated in this letter and referenced attachments and submit them with the others.
If they do not meet these requirements, you must modify and resubmit the plans.
The results of the receptor survey shall be presented on a sufficiently scaled
map. The map shall show the coal ash facility location, the facility property
boundary, the waste and compliance boundaries, and all monitoring wells listed
in the respective NPDES permits. Any identified water supply wells shall be
located on the map and shall have the well owner's name and location address
listed on a separate table that can be matched to its location on the map.
In accordance with the requirements of the NORR, HDR completed and submitted the receptor
survey to NCDENR (HDR, 2014A) in September 2014. HDR subsequently submitted to
NCDENR a supplement to the receptor survey (HDR, 2014B) in November 2014. The
supplementary information was obtained from responses to water supply well survey
questionnaires mailed to property owners within a 0.5-mile radius of the BCCS ash basin
compliance boundary requesting information on the presence of water supply wells and well
usage.
The receptor survey includes a map showing the coal ash facility location, the facility property
boundary, the waste and compliance boundaries, and all monitoring wells listed in the NPDES
permit. The identified water supply wells are located on the map, and the well owner's name
and location address are listed on a separate table that can be matched to its location on the
map.
During completion of the CSA, HDR will update the receptor information as necessary, in
general accordance with the CSA receptor survey requirements
Duke Energy Carolinas, LLC | Proposed Groundwater Assessment Work Plan
Buck Combined Cycle Station Ash Basin
4.0 REGIONAL GEOLOGY AND HYDROGEOLOGY
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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 Buck site is located
in the Charlotte terrane within the Piedmont province. The Piedmont province is bounded to the
east and southeast by the Atlantic Coastal Plain and to the west by the escarpment of the Blue
Ridge Mountains, covering a distance of 150 to 225 miles (LeGrand, 2004).
The topography of the Piedmont region is characterized by low, rounded hills and long, rolling,
northeast-southwest trending ridges (Heath, 1984). Stream valley to ridge relief in most areas
ranges from 75 to 200 feet. Along the Coastal Plain boundary, the Piedmont region rises from
an elevation of 300 feet above mean sea level, to the base of the Blue Ridge Mountains at an
elevation of 1,500 feet (LeGrand, 2004).
The Charlotte terrane consists primarily of igneous and metamorphic bedrock. The fractured
bedrock is overlain by a mantle of unconsolidated material known as regolith. The regolith
includes residual soil and saprolite zones and, where present, alluvium. Saprolite, the product
of chemical weathering of the underlying bedrock, is typically composed of clay and coarser
granular material and reflects the texture and structure of the rock from which it was formed.
The weathering products of granitic rocks are quartz-rich and sandy textured. Rocks poor in
quartz and rich in feldspar and ferro-magnesium minerals form a more clayey saprolite.
The groundwater system in the Piedmont Province, in most cases, is comprised of two
interconnected layers, or mediums: 1) residual soil/saprolite and weathered fractured rock
(regolith) overlying 2) fractured crystalline bedrock (Heath 1980; Harned and Daniel 1992). The
regolith layer is a thoroughly weathered and structureless residual soil that occurs near the
ground surface with the degree of weathering decreasing with depth. The residual soil grades
into saprolite, a coarser grained material that retains the structure of the parent bedrock.
Beneath the saprolite, partially weathered/fractured bedrock occurs with depth until sound
bedrock is encountered. This mantle of residual soil, saprolite, and weathered/fractured rock is
a hydrogeologic unit that covers and crosses various types of rock (LeGrand 1988). This layer
serves as the principal storage reservoir and provides an intergranular medium through which
the recharge and discharge of water from the underlying fractured rock occurs. Within the
fractured crystalline bedrock layer, the fractures control both the hydraulic conductivity and
storage capacity of the rock mass. A transition zone at the base of the regolith has been
interpreted to be present in many areas of the Piedmont. The zone consists of partially
weathered/fractured bedrock and lesser amounts of saprolite that grades into bedrock and has
been described as “being the most permeable part of the system, even slightly more permeable
than the soil zone” (Harned and Daniel 1992). The zone thins and thickens within short
distances and its boundaries may be difficult to distinguish. It has been suggested that the zone
may serve as a conduit of rapid flow and transmission of contaminated water (Harned and
Daniel 1992).
The igneous and metamorphic bedrock in the Piedmont consist of interlocking crystals and
primary porosity is very low, generally less than three percent. Secondary porosity of crystalline
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bedrock due to weathering and fractures ranges from one to ten percent (Freeze and Cherry,
1979) but, porosity values of from one to three percent are more typical (Daniel and Sharpless
1983). Daniel (1990) reported that the porosity of the regolith ranges from 35 to 55 percent near
land surface but decreases with depth as the degree of weathering decreases.
LeGrand’s (1988; 1989) conceptual model of the groundwater setting in the Piedmont
incorporates the above two medium system into an entity that is useful for the description of
groundwater conditions. That entity is the surface drainage basin that contains a perennial
stream (LeGrand 1988). Each basin is similar to adjacent basins and the conditions are
generally repetitive from basin to basin. Within a basin, movement of groundwater is generally
restricted to the area extending from the drainage divides to a perennial stream (Slope-Aquifer
System; LeGrand 1988; 1989). Rarely does groundwater move beneath a perennial stream to
another more distant stream or across drainage divides (LeGrand 1989). The crests of the
water table undulations represent natural groundwater divides within a slope-aquifer system and
may limit the area of influence of wells or contaminant plumes located within their boundaries.
The concave topographic areas between the topographic divides may be considered as flow
compartments that are open-ended down slope.
Therefore, in most cases in the Piedmont, the groundwater system is a two medium system
(LeGrand 1988) restricted to the local drainage basin. The groundwater occurs in a system
composed of two interconnected layers: residual soil/saprolite and weathered rock overlying
fractured crystalline rock separated by the transition zone. Typically, the residual soil/saprolite
is partially saturated and the water table fluctuates within it. Water movement is generally
through the weathered/fractured and fractured bedrock. The near-surface fractured crystalline
rocks can form extensive aquifers. The character of such aquifers results from the combined
effects of the rock type, fracture system, topography, and weathering. Topography exerts an
influence on both weathering and the opening of fractures, while the weathering of the
crystalline rock modifies both transmissive and storage characteristics.
Groundwater flow paths in the Piedmont are almost invariably restricted to the zone underlying
the topographic slope extending from a topographic divide to an adjacent stream. Under natural
conditions, the general direction of groundwater flow can be approximated from the surface
topography (LeGrand 2004).
Groundwater recharge in the Piedmont is derived entirely from infiltration of local precipitation.
Groundwater recharge occurs in areas of higher topography (i.e., hilltops) and groundwater
discharge occurs in lowland areas bordering surface water bodies, marshes, and floodplains
(LeGrand 2004). Average annual precipitation in the Piedmont ranges from 42 inches to 46
inches. Mean annual recharge in the Piedmont ranges from 4.0 to 9.7 inches per year (Daniel
2001).
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5.0 Initial Conceptual Site Model
The following Initial Conceptual Site Model (ICSM) has been developed for the Buck site using
available regional data and site-specific data (e.g., boring logs, well construction records, etc.).
Although the groundwater flow system at the site is not fully understood and heterogeneities
exist, the available data indicates that the LeGrand Slope-Aquifer hydrogeologic conceptual
model for sites within the Piedmont, as described in Section 4.0, is a reasonable preliminary
representation of site conditions. The ICSM served as the foundation for the development of
proposed field activities and data collection presented in Section 7.0. The ICSM will be refined
as needed as additional site-specific information is obtained during the site assessment
process.
The ICSM serves as the basis for understanding the hydrogeologic characteristics of the site, as
well as the characteristics of the ash sources, and will serve as the basis for the Site Conceptual
Model (SCM) discussed in Section 7.5.
In general, the ICSM identified the need for the following additional information concerning the
site and ash:
Delineation of the extent of possible soil and groundwater contamination;
Additional information concerning the direction and velocity of groundwater flow;
Information on the constituents and concentrations found in the site ash;
Properties of site materials influencing fate and transport of constituents found in ash;
and
Information on possible impacts to seeps and surface water from the constituents found
in the ash.
The assessment work plan found in Section 7.0 was developed in order to collect and to
perform the analyses to provide this information. Locations of site features described below are
provided in Figure 2.
5.1 Physical Site Characteristics
The original ash pond at the Buck site began operation in 1957 and was formed by constructing
a dam across a tributary of the Yadkin River. The footprint of the original ash pond was the
approximate current footprint of Cells 2 and 3. As the ash pond capacity diminished over time,
the original pond was divided into two ash ponds (Cells 2 and 3) in 1977 by construction of a an
intermediate dike over ash, raising the western half of the original dam by approximately 10 feet.
In 1982, additional storage was created by construction of Cell 1, separate from the other cells,
by building a new dike upgradient and to the west of Cell 2.
Topography at the Buck site ranges from an approximate high elevation of 740 feet near the
southwest edge of the property near Dukeville Road to an approximate low elevation of 620 feet
at the interface with the Yadkin River on the northern extent of the site. Topography generally
slopes from a south to north direction with an elevation loss of approximately 120 feet over an
approximate distance of 1.1 miles. Surface water drainage generally follows site topography
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and flows from the south to the north across the site except where natural drainage patterns
have been modified by the ash basin or other construction. Unnamed drainage features are
located near the western and eastern edges of the site and generally flow south to the Yadkin
River. The approximate pond elevations for the three ash basin cells are: Cell 1 – 705 feet;
Cell 2 – 682 feet; Cell 3 – 674 feet. The elevation of the Yadkin River at the site is
approximately 620 feet.
In addition to the ash basin, an unlined dry ash storage area is located topographically
upgradient and adjacent to the east side of Cell 1. The dry ash storage area was constructed in
2009 by excavating ash within the eastern half of Cell 1 in order to provide additional capacity
for sluiced ash.
A soil stockpile is located immediately south of the Cell 1 discharge tower as shown on Figures
2 and 3. The stockpile is a remnant of the construction of the canal leading from Cell 1 to Cell
2. The stockpile does not contain ash and therefore is not included within the waste boundary.
5.1.1 Ash Basin
Coal ash residue from the coal combustion process was disposed in the BCCS ash basin until
the last coal-fired generating units were retired in April 2013. The construction sequence of the
ash basin was described in Section 2.0.
All coal ash from BSS was disposed of in the ash basin from approximately 1957 until 2013. Fly
ash precipitated from flue gas and bottom ash collected in the bottom of the boilers were sluiced
to the ash basin using conveyance water withdrawn from the Yadkin River. Until Cell 1 was
constructed, ash generated from the coal combustion process at BSS was sluiced (via ash
discharge lines) to the northwest corner of Cell 2. Following construction of Cell 1, sluiced ash
was re-routed from Cell 2 to the north side of Cell 1.
The discharge flow from Cell 1 enters Cell 2 via the Primary Cell Discharge Tower. Flow from
Cell 2 enters Cell 3 via the Old Primary Cell Discharge Structure. Flow is discharged to the
Yadkin River through the Secondary Cell Discharge Tower located at the north end of Cell 3.
The concrete discharge tower drains through a 36-inch-diameter, slip-lined corrugated metal
pipe.
The approximate pond elevations for the three ash basin cells are: Cell 1 – pond elevation 705
feet; Cell 2 – pond elevation 682 feet; Cell 3 – pond elevation 674 feet. The elevation of the
Yadkin River near the site is approximately 620 feet. The ash basin pond elevations are
controlled by the use of concrete stop logs in the three discharge towers.
The area contained within the waste boundary for Cell 1 encompasses approximately 90 acres.
For purposes of delineating the waste boundary, Cells 2 and 3 are considered a single unit, with
the area contained within this portion of the waste boundary encompassing approximately 80.7
acres. The ash basin waste boundary is shown on Figures 2 and 3.
The quantity of ash contained within the ash basin was estimated by comparing the digitized
pre-basin topographic survey of the site to the latest topographic and bathymetric survey of the
basin, dated November 2013, which was after the last coal-fired generating unit was retired.
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The estimated in-place quantities of ash are: Cell 1 – 2,366,000 cubic yards (cy), Cell 2 –
1,624,000 cy, and Cell 3 – 227,000 cy. Actual ash quantities may be greater than those
calculated since soil borrow operations are known to have taken place within the ash basin
boundaries prior to the deposition of ash.
During operation of the coal-fired units, the ash basin received variable inflows from the ash
removal system and other permitted discharges. Currently, the ash basin receives variable
inflows from the station yard drain sump, stormwater flows, BSS wastewater, and BCCS
wastewater. Currently, Duke Energy is evaluating alternatives from removing these flows from
the ash basin in order to allow total decommissioning of the ash basin.
5.1.2 Dry Ash Storage Area
An unlined dry ash storage area is located topographically upgradient and adjacent to the east
side of Cell 1. The dry ash storage area was constructed in 2009 by excavating ash within the
eastern half of Cell 1 in order to provide additional capacity for sluiced ash. Following the
completion of excavation and stockpiling, the dry ash storage area was graded to drain and a
minimum of 18 and 24 inches of soil cover were placed on the top slopes and sideslopes,
respectively, and vegetation was established. The estimated in-place quantity of ash stored at
this location is 209,000 cy based on a comparison of original site topography and the latest
topographic survey of the site from November 2013.
5.2 Source Characteristics
The ash in the ash basin consists of fly ash and bottom ash produced from the combustion of
coal. The physical and chemical properties of coal ash are determined by reactions that occur
during the combustion of the coal and subsequent cooling of the flue gas. In general, coal is
dried, pulverized, and conveyed to the burner area of a boiler for combustion. Material that
forms larger particles of ash and falls to the bottom of the boiler is referred to as bottom ash.
Smaller particles of ash, fly ash, are carried upward in the flue gas and are captured by an air
pollution control device. Approximately 70% to 80% of the ash produced during coal
combustion is fly ash (EPRI 1993). Typically 65% to 90% of fly ash has particle sizes that are
less than 0.010 millimeter (mm). Bottom ash particle diameters can vary from approximately 38
mm to 0.05 mm.
The chemical composition of coal ash is determined based on many factors including the source
of the coal, the type of boiler where the combustion occurs (the thermodynamics of the boiler),
and air pollution control technologies employed. The major elemental composition of fly ash
(approximately 90% by weight) is composed of mineral oxides of silicon, aluminum, iron, and
calcium. Minor constituents such as magnesium, potassium, titanium, and sulfur comprise
approximately 8% of the mineral component, while trace constituents such as arsenic,
cadmium, lead, mercury, and selenium make up less than approximately 1% of the total
composition (EPRI 2009). Other trace constituents in coal ash (fly ash and bottom ash) consist
of antimony, barium, beryllium, boron, chromium, copper, lead, mercury, molybdenum, nickel,
selenium, strontium, thallium, uranium, vanadium, and zinc (EPRI 2009).
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In addition to these constituents, coal ash leachate contains chloride, fluoride, sulfate, and
sulfide. In the U.S. Environmental Protection Agency’s (EPA’s) Proposed Rules Disposal of
Coal Combustion Residuals From Electric Utilities Federal Register / Vol. 75, No. 118 / Monday,
June 21, 2010, 35206, EPA proposed that the following constituents be used as indicators of
groundwater contamination in the detection monitoring program for coal combustion residual
landfills and surface impoundments: boron, chloride, conductivity, fluoride, pH, sulfate, sulfide,
and total dissolved solids (TDS). In selecting the constituents for detection monitoring, EPA
selected those that are present in coal combustion residuals that would move rapidly through
the subsurface, thereby, providing an early indication that contaminants were migrating from the
landfill or ash basin.
In the 1998 Report to Congress Wastes from the Combustion of Fossil Fuels (USEPA 1998),
EPA presented waste characterization data for CCP wastes in impoundments and in landfills.
The constituents listed were: arsenic, barium, beryllium, boron, cadmium, chromium, cobalt,
copper, lead, manganese, nickel, selenium, silver, thallium, strontium, vanadium, and zinc. In
this report, the EPA reviewed radionuclide concentrations in coal and ash and ultimately,
eliminated radionuclides from further consideration due to the low risks associated with the
radionuclides.
The geochemical factors controlling the reactions associated with leaching of ash and the
movement and transport of the constituents leached from ash is complicated. The mechanisms
that affect movement and transport vary by constituent, but, in general, are mineral equilibrium,
solubility, and adsorption onto inorganic soil particles. Due to the complexity associated with
understanding or identifying the specific mechanism controlling these processes, HDR believes
that the effect of these processes are best considered by determination of site-specific, soil-
water distribution coefficient, Kd, values as described in Section 7.7.
The oxidation-reductions and precipitation-dissolution reactions that occur in a complex
environment, such as an ash basin, are poorly understood. In addition to the variability that
might be seen in the mineralogical composition of the ash, based on different coal types,
different age of ash in the basin, etc., it would be anticipated that the chemical environment of
the ash basin would vary over time and over distance and depth, increasing the difficulty of
making specific predictions related to concentrations of specific constituents.
HDR does not believe that conditions in the site groundwater will be likely to produce methane;
therefore methane was not included in the sample parameters.
Duke Energy has performed limited leaching analysis on fly ash and bottom ash. Available data
is presented in Table 3.
Due to the complex nature of the geochemical environment and processes in the ash basin,
HDR believes that the most useful representation of the potential impacts to groundwater will be
obtained from the sampling and analyses of ash in the basin and from pore water and
groundwater samples proposed in Section 7.0 of this work plan.
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Understanding the factors controlling the mobility, retention, and transport of the constituents
that may leach from ash are also complicated by the complex nature of the geochemical
environment of the ash basin combined with the complex geochemical processes occurring in
the soils beneath the ash basin along the groundwater flow paths. Mobility, retention, and
transport of the constituents can vary by each individual constituent. As these processes are
complex and are highly dependent on the mineral composition of the soils, it will not be possible
to determine with absolute clarity the specific mechanism that controls the mobility and retention
of the constituents; however, the effect of these processes will be represented by the
determination of the site-specific soil-water distribution coefficient, Kd, values as described in
Section 7.7. As described in that section, samples will be collected to develop Kd terms for the
various materials encountered at the site. These Kd terms are then to be used as part of the
groundwater modeling, if required to predict concentrations of constituents at the compliance
boundary.
The site residual soils were formed by in-place weathering of meta-quartz diorite, mica schist,
and biotite gneiss. Iron (Fe) and manganese (Mn), present in groundwater at a number of the
on-site monitoring wells, are constituents of the bedrock, primarily in ferro-magnesium minerals.
Manganese substitutes for iron and magnesium in a number of minerals and is enriched in
mafic and ultramafic lithologies relative to felsic lithologies (1,000 ppm in basalt and 400 ppm in
granite; Krauskopf 1972). In the Piedmont, manganese oxides occur as thin coatings along
bedrock fractures and as thin-coatings along relict discontinuities in saprolite. Manganese
ranges from 20 to 3,000 ppm in residual soils (Krauskopf 1972).
In a study in Orange County, North Carolina, Cunningham and Daniel (2001) reported
manganese in 94% and iron in 80% of the drinking water wells tested. Iron exceeded North
Carolina drinking water standards in 6% of the wells and for manganese in 24% of the wells
(Cunningham and Daniel 2001). In more recent study, Gillispie (2014) found that approximately
50% of wells in North Carolina have manganese concentrations exceeding the state standard of
0.05 mg/L (Gillispie 2014). The manganese detected in water wells at ten NC Division of Water
Resources groundwater research stations studied by Gillispie (2014) is naturally derived and
concentrations are spatially variable ranging from less than 0.01 to greater than 2 mg/L.
5.3 Hydrogeologic Site Characteristics
Based on lithological data obtained from soil boring and well installation activities conducted by
HDR during ash basin closure assessment activities (HDR, 2014C), subsurface stratigraphy
consists of the following material types: fill, ash, residual soil, saprolite, alluvium, partially
weathered rock (PWR), and bedrock. In general, residual soil, saprolite, and PWR were
encountered on most areas of the site. Ash was encountered within the ash basin and ash
storage area, while alluvium was restricted to areas adjacent to historical drainage features in
the northwest portion of Cell 1 and the northeast portion of Cell 3 (i.e., near the Cell 1 and Cell 3
dams). Bedrock was encountered between 67 feet and 113 feet in several deep borings
completed within Cells 1, 2, and 3.
Cross sections depicting the hydrostratigraphic units were developed for the ash basin closure
assessment activities. The site plan and cross sections are shown in Appendix B.
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The general stratigraphic units, in sequence from the ground surface down, are defined as
follows:
Fill – Fill material generally consisted of re-worked silts and clays that were borrowed
from one area of the site and re-distributed to other areas. Fill was used in the
construction of dikes and as cover for the ash storage area.
Ash – Ash was encountered in borings advanced within the ash basin and ash storage
area. Ash was generally described as gray to black with a silty to sandy texture,
consistent with fly ash and bottom ash.
Alluvium – Alluvium is unconsolidated soil and sediment that has been eroded and
redeposited by streams and rivers. Alluvium may consist of a variety of materials
ranging from silts and clays to sands and gravels. Alluvium was encountered in two
borings located in areas adjacent to historical drainage features in the northwest portion
of Cell 1 and the northeast portion of Cell 3 (i.e., near the Cell 1 and Cell 3 dams), and
consisted of dark bluish gray poorly graded sand and black organic-laden soil.
Residual Soil – The soil that develops by in-place weathering and consists of orange,
tan, brown, gray, or black sandy silt to silty sand. This unit was encountered in various
thicknesses across the site. The residual soil horizon grades into saprolite at depth.
Saprolite – Saprolite develops by the in-place weathering of igneous and metamorphic
rocks. Saprolite is characterized by the preservation of structures that were present in
the unweathered parent bedrock.
Partially Weathered Rock (PWR) – PWR occurs between the saprolite and bedrock
and contains saprolite and rock remnants. The unit is described as brown, tan, white, or
gray silty sand with trace rock fragments and reddish brown to grayish green silt with
mica.
Bedrock – Bedrock was encountered in four deep borings completed within Cells 1, 2,
and 3. Bedrock was described as meta-quartz diorite, mica schist, and biotite gneiss.
Hydraulic conductivity in these hydrostratigraphic units can vary, but is generally thought to fall
within the ranges provided in the table below where Kh refers to hydraulic conductivity in the
horizontal direction and Kv refers to hydraulic conductivity in the vertical direction:
Hydrostratigraphic Unit Range of k Values (cm/sec)
Fill (Kh)2 1.0E-06 to 1.0E-04
Ash (Kh)5 1.0 E-06 to 1.0E-04
Ash (Kv)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 sites within the Carolina Piedmont.
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2. Estimates for F (fill) based on data that indicates the ‘k’ for fill is about an order of magnitude lower than
the in-situ material used for the fill (after compaction).
3. Hydraulic Conductivity Database - HDR (unpublished data).
4. Hydraulic Conductivity data from site-specific laboratory testing of Shelby tube samples from BCCS (HDR,
2014C)
5. Data from in-situ permeability tests at ash basins located within the Carolina Piedmont.
As the site is located in the Piedmont, it is anticipated that the groundwater flow will be primarily
in the saprolite and the transition zone material with flow also occurring in the fractured or
weathered zones in bedrock. Site data on the physical transport characteristics such as
porosity and hydraulic conductivity of the site exists from the Data Report for the conceptual ash
basin closure at the Buck site (HDR, 2014C). The sampling and testing proposed in Section 7
will provide additional information on the transport characteristics of the materials at the site.
Groundwater flow and transport at the Buck site are assumed to follow the local slope aquifer
system, as described by LeGrand (2004). Under natural conditions, the general direction of
groundwater flow can be approximated from the surface topography. A topographic divide is
located approximately along Leonard Road, to the south of the ash basin. This topographic
divide likely also functions as a groundwater divide. The Yadkin River is located to the north of
the ash basin. The predominant direction of groundwater flow from the ash basin is likely in a
northerly direction, generally towards the Yadkin River.
Groundwater recharge in the Piedmont is derived entirely from infiltration of local precipitation.
Groundwater recharge occurs in areas of higher topography (i.e., hilltops) and groundwater
discharge occurs in lowland areas bordering surface water bodies, marshes, and floodplains
(LeGrand 2004). At the Buck site, groundwater recharge is expected to occur on the southern
portion of the site where topography is higher. Groundwater is expected to discharge into
tributary drainage features or into the Yadkin River to the north.
Following completion of the groundwater assessment work, a site conceptual model will be
developed, as described in Section 7.5.
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6.0 Compliance Groundwater Monitoring
As described in Section 2.3, groundwater monitoring is required as a condition of the NPDES
permit. From March 2011 through November 2014, the compliance groundwater monitoring
wells at the Buck site have been sampled a total of 12 times. During this period, these
monitoring wells were sampled in:
March 2011
July 2011
November 2011
March 2012
July 2012
November 2012
March 2013
July 2013
November 2013
March 2014
July 2014
November 2014
With the exception of boron, chromium, iron, manganese, pH, sulfate, and TDS, the results for
all monitored parameters and constituents were less than the 2L Standards. Table 2 lists the
range of exceedances for boron, chromium, iron, manganese, pH, sulfate, and TDS for the
period of March 2011 through July 2014.
HDR previously prepared a draft data report in support of the conceptual design of the ash
basin closure at the Buck site (HDR, 2014C). Results from this data report will be considered
as supplemental data for the groundwater assessment work required by the NORR. In addition,
select existing monitoring wells associated with the conceptual ash basin closure assessment
will be resampled to supplement groundwater quality data for this groundwater assessment.
All available groundwater quality data for compliance monitoring wells, voluntary monitoring
wells, and conceptual closure monitoring wells (as mentioned above and shown on Figure 2)
are summarized on Table 4. In addition, soil and ash quality data from the draft conceptual
closure data report are provided in Table 5. Surface water quality data from the draft
conceptual closure data report are provided in Table 6. Ash basin pore water data from the
draft conceptual closure data report are provided in Table 7. Seep analytical results are
provided in Table 8.
Compliance groundwater monitoring will continue as scheduled in accordance with the
requirements of the NPDES permit.
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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,
Surface water samples from water bodies located within the ash basin waste boundary,
Surface water and sediment samples from surface water locations potentially impacted
by the ash basin due to their proximity to or downgradient locations from the basinas
well as an upgradient background location, and
Seep samples from locations identified as part of Duke Energy’s NPDES permit renewal
application (from July and August 2014).
In addition, hydrogeologic evaluation testing will be conducted during and following monitoring
well installation activities, as described in Section 7.1.6. Existing groundwater quality data from
compliance monitoring wells, voluntary monitoring wells, and ash basin closure monitoring wells
will be used to supplement data obtained from this assessment work.
A summary of the proposed exploration plan, including estimated sample quantities and
estimated depths of soil borings and monitoring wells, is presented in Table 9. The proposed
sampling locations are shown on Figure 3.
Groundwater samples collected from compliance monitoring wells MW -8S/D, MW -6S, MW-12S,
and MW -13D are located at or close to the Duke Energy property line and have shown
exceedances of the 2L Standards. These exceedances have primarily consisted of iron and/or
manganese, with chromium exceedances limited to monitoring well MW -12S only in 2011.
Upon approval of the work plan, HDR proposes to perform an evaluation of these exceedances
with respect to turbidity and to naturally occurring background conditions. If that evaluation
finds the exceedances are caused by turbidity, the well(s) will be redeveloped and replaced, if
required, as described in Section 7.2.1. If that evaluation finds that the exceedances are not
caused by turbidity or naturally occurring conditions, then additional monitoring wells will be
installed to delineate the extent of the exceedances. The proposed potential locations would
not be located on Duke Energy property and would require permission from the adjacent
property owners. The proposed potential locations of these wells are shown on Figure 3. The
installation depths of the well screens will be determined based on site conditions and the depth
of the compliance wells with the exceedance.
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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 9.
For nested monitoring wells, the deep monitoring well boring will be utilized for characterization
of subsurface materials and samples will be collected for laboratory analysis. Shallow, deep,
and bedrock monitoring well borings will be logged in the field as described below.
At the conclusion of well installation activities, well construction details – including casing depth;
total well depth; and well screen length, slot size, and placement within specific
hydrostratigraphic units – will be presented in tabular form for inclusion into the final CSA
Report. Well completion records will be submitted to NCDENR within 30 days of completion.
Duke Energy acknowledges that subsurface geophysics may be useful for evaluation of
subsurface conditions in areas of the site that have not been significantly reworked by
construction or ash management activities, but less useful in basins and fills. Subsequent to
evaluation of field data obtained during the proposed investigation activities, Duke Energy will
evaluate the need for and potential usefulness of subsurface geophysics in select areas of the
site. If it is determined that subsurface investigation is warranted, Duke Energy and HDR will
notify the NCDENR regional office prior to initiating additional investigations.
7.1.1 Ash and Soil Borings
Characterization of ash and underlying soil will be accomplished through the completion and
sampling of borings advanced at ten locations within Cells 1, 2, and 3 and on the Cell 1 and Cell
3 dams (designated as AB-1 through AB-10) and three locations within the Ash Storage Area
located immediately east of Cell 1 (designated as AS-1 through AS-3). In addition, 14 soil
borings (designated as GWA-1 through GWA-11 and BG-1 through BG-3) will be completed
outside of ash management areas to provide additional soil quality data.
Field data collected during boring advancement will be used to evaluate:
Presence or absence of ash,
Areal extent and depth/thickness of ash, and
Groundwater flow and transport characteristics, if groundwater is encountered.
Borings will be advanced using hollow stem auger or roller cone drilling techniques to facilitate
collection of downhole data. Standard Penetration Testing (SPT) (ASTM D 1586) and split-
spoon sampling will be performed at 5-foot increments using an 18-inch split-spoon sampler.
Note that continuous coring will be performed from auger refusal to a depth of at least 50 feet
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into competent bedrock for deep bedrock monitoring well borings (designated as BR soil
boring/groundwater monitoring well locations on Figure 3).
Borings will be logged and ash/soil samples will be photographed, described, and visually
classified in the field for origin, consistency/relative density, color, and soil type in accordance
with the Unified Soil Classification System (ASTM D2487/D2488).
BORINGS WITHIN ASH BASIN AND ASH STORAGE AREA
In areas where ash is known or suspected to be present (i.e., AB- and AS-borings), solid phase
samples will be collected for laboratory analysis from the following intervals in each boring:
Shallow Ash – approximately 3 − 5 feet bgs
Deeper Ash – approximately 2 feet above the ash/soil interface
Upper Soil – approximately 2 feet below the ash/soil interface
Deeper Soil – approximately 8 − 10 feet below the ash/soil interface
If ash is observed to be greater than 30 feet thick, a third ash sample will be collected from the
approximate mid-point depth between the shallow and deeper samples. The ash samples will
be used to evaluate geochemical variations in ash located in the ash basin and ash storage
area. The remaining soil samples will be used to delineate the vertical extent of potential soil
impacts beneath the ash basin and ash storage area.
Ash and soil samples will be analyzed for total inorganic compounds, as presented in Table 10.
Select ash samples will be analyzed for leachable inorganic compounds using the Synthetic
Precipitation Leaching Procedure (SPLP) to evaluate the potential for leaching of constituents
from ash into underlying soil. The ash SPLP analytical results will be compared to Class GA
Standards as found in 15A NCAC 02L .0202 Groundwater Quality Standards, last amended on
April 1, 2013 (2L Standards).
Bathymetric surveys performed within the ponded areas of Cells 1, 2, and 3 indicate that ash
exists beneath most, if not all, of the ponded areas at varying depths. Due to safety concerns,
borings will not be completed where ponded water is present within the ash basin. Safety
concerns may also prevent access to proposed boring locations on ash areas where saturated
ash presents stability issues.
BORINGS OUTSIDE ASH BASIN AND ASH STORAGE AREA
Borings located outside the ash basin and ash storage are designated as GWA- and BG-
borings.
The soil samples obtained from the above-listed borings will be used to provide additional
characterization of soil conditions outside the ash basin and ash storage area. Solid phase
samples will be collected for laboratory analysis from the following intervals in each boring:
Approximately 2 – 3 feet above the water table,
Approximately 2 – 3 feet below the water table,
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Within the saturated upper transition zone material (if not already included in the two
sample intervals above), and
From a primary, open, stained fracture within fresh bedrock if existent (bedrock core
locations only).
The laboratory analyses performed on these samples will depend on the nature and quantity of
material collected.
One or more of the above listed sampling intervals may be combined if field conditions indicate
they are in close proximity to each other (i.e., one sample will be obtained that will be applicable
to more than one interval).
The boring locations designated as BG- borings will be used to evaluate site-specific
background soil quality. Solid phase samples will be collected for laboratory analysis from the
following intervals in each boring:
At approximately ten-foot intervals until reaching the water table (i.e., 0 – 2 feet, 10 – 12
feet, 20 – 22 feet, and so forth),
Approximately 2 – 3 feet above the water table,
Approximately 2 – 3 feet below the water table,
Within the saturated upper transition zone material (if not already included in the sample
intervals above, and
From a primary, open, stained fracture within fresh bedrock if existent (bedrock core
locations only).
The laboratory analyses performed on these samples will depend on the nature and quantity of
material collected.
One or more of the above listed sampling intervals may be combined if field conditions indicate
they are in close proximity to each other (i.e., one sample will be obtained that will be applicable
to more than one interval).
INDEX PROPERTY SAMPLING AND ANALYSES
In addition, physical properties of ash and soil will be tested in the laboratory to provide data for
use in groundwater modeling. Split-spoon samples will be collected at selected locations, with
the minimum number of samples collected from the material types as follows:
Fill – 5 samples
Ash – 5 samples
Alluvium – 5 samples
Soil/Saprolite – 5 samples
Soil/Saprolite (immediately above refusal) – 5 samples
Select split-spoon samples will be tested for:
Natural Moisture Content Determination, in accordance with ASTM D-2216
Grain size with hydrometer determination, in accordance with ASTM Standard D-422
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The select split-spoon samples are anticipated to be collected from the following boring
locations:
Fill – AB-9S/D (two samples) and AB10S/D (three samples)
Ash – AB-1D, AB-3S/D, AS-2D, AB-4S/D, and AB-6D
Alluvium (if present) – AB-4S/D, AB-5S/D, AB-7S/D, AB-9S/D/BR (two samples)
Soil/Saprolite (two locations each as stated above) – BG-1S/D/BR, BG-2S/D/BR, GWA-
9S/D, AS-1S/D, and AS-3S/D
The depth intervals of the select split-spoon samples will be determined in the field by the Lead
Geologist/Engineer.
In addition to split-spoon sampling, a minimum of five thin-walled, undisturbed tubes (“Shelby”
Tubes) in fill, ash, and soil/saprolite layers will be collected from the above-referenced boring
locations. Sample depths will be determined in the field based on conditions encountered
during borehole advancement. The Shelby Tubes will be transported to a soil testing laboratory
and each tube will be tested for the following:
Natural Moisture Content Determination, in accordance with ASTM D-2216
Grain size with hydrometer determination, in accordance with ASTM Standard D-422
Hydraulic Conductivity Determination, in accordance with ASTM Standard D-5084
Specific Gravity of Soils, in accordance with ASTM Standard D-854
The results of the laboratory soil and ash property determination will be used to determine
additional soil properties such as porosity, transmissivity, and specific storativity. The results
from these tests will be used in the groundwater fate and transport modeling. The specific
borings where these samples are collected from will be determined based on field conditions,
with consideration given to their location relative to use in the groundwater model.
7.1.2 Shallow Monitoring Wells
SHALLOW MONITORING WELLS IN REGOLITH
Groundwater quality and flow characteristics within the regolith aquifer will be evaluated through
the installation, sampling, and testing of 14 shallow monitoring wells at the locations specified
on Figure 3 with an “S” qualifier in the well name (e.g., GWA-1S). Shallow monitoring wells in
regolith are defined as wells that are screened wholly within the regolith zone and set to bracket
the water table surface at the time of installation.
Shallow monitoring wells will be installed using hollow stem auger or roller cone drilling
techniques. At each monitoring well location, a shallow well will be constructed with a 2-inch-
diameter, schedule 40 PVC screen and casing. Each of these wells will have a 10-foot to 15-
foot pre-packed well screen having manufactured 0.010-inch slots.
In the event that the regolith zone is found to be relatively thick at a particular well location and
that more than one discreet flow zone is observed during drilling (e.g., presence of confining
unit), a second shallow monitoring well will be installed to provide groundwater flow and quality
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data for upper and lower flow zones. In these instances, the wells will be designated as “S” and
“SL” to differentiate between the upper and lower shallow wells located in the regolith zone.
SHALLOW MONITORING WELLS IN DAMS
Groundwater quality and flow characteristics of the phreatic surface within ash basin dams not
founded on ash will be evaluated through the installation, sampling and testing of one shallow
monitoring well located on the main dam on the north side of Cell 1 (AB-10S) and one shallow
monitoring well located on the main dam on the north side of Cell 2 (AB-9S). Wells will be
installed with 10-foot to 15-foot screens with the well screen set to bracket the phreatic surface
at the time of installation.
Shallow monitoring wells will be installed using hollow stem auger or roller cone drilling
techniques. At each monitoring well location, a shallow well will be constructed with a 2-inch-
diameter, schedule 40 PVC screen and casing. Each of these wells will have a 10-foot to 15-
foot pre-packed well screen having manufactured 0.010-inch slots.
SHALLOW MONITORING WELLS IN ASH BASIN POREWATER
The water quality and flow characteristics within the ash basin porewater will be evaluated
through the installation, sampling and testing of 12 porewater wells at the locations specified on
Figure 3. Wells designated as “S” will be installed with 10-foot to15-foot screens with the well
screen set to bracket the water table surface at the time of installation. Wells designated as
“SL” will be installed with the bottom of the well screen set above the ash-regolith interface and
will be installed with 10-foot screens.
These wells will be installed using hollow stem auger or roller cone drilling techniques. The
wells will be constructed with 2-inch-diameter, schedule 40 PVC screen and casing. These
wells will be installed with pre-packed well screens having manufactured 0.010-inch slots.
7.1.3 Deep Monitoring Wells
Groundwater quality and flow characteristics within the transition zone (if present) will be
evaluated through the installation, sampling, and testing of 27 deep monitoring wells at the
locations specified on Figure 3 with a “D” qualifier in the well name (e.g., 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.
Deep monitoring wells will be installed using hollow stem augers and rock coring drilling
techniques. At each deep monitoring well location, a double-cased well will be constructed with
a 6-inch-diameter PVC outer casing and a 2-inch-diameter PVC inner casing and well screen.
The purpose of installing cased wells at the site is to prevent possible cross-contamination of
flow zones within the shallow and deeper portions of the unconfined aquifer during well
installation. Outer well casings (6-inch casing) will be advanced to auger refusal and set
approximately 1 foot into PWR (if present). Note that location-specific subsurface geology will
dictate actual casing depths on a per-well basis. The annulus between the borehole and casing
will be grouted to the surface using the tremie grout method. After the grout has been allowed
to cure for a period of 24 hours, the borehole will be extended via coring approximately 10 feet
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to 15 feet into transition zone rock using an HQ core barrel. A 2-inch-diameter well with a 5-foot
pre-packed well screen will be set at least 2 feet below the bottom of the outer casing.
If the PWR thickness is determined to be greater than 30 feet thick at a nested well location,
additional wells in the transition zone will be considered based on site-specific conditions.
Rock cores will be logged in accordance with the Field Guide for Rock Core Logging and
Fracture Analysis by Midwest GeoSciences Group. Percent recovery and rock quality
designation (RQD) will be calculated in the field. The cores will be photographed and retained.
7.1.4 Bedrock Monitoring Wells
Groundwater quality and flow within fractured bedrock beneath the site will be evaluated
through the installation, sampling and testing of 4 bedrock monitoring wells at the locations
specified on Figure 3 with a “BR” qualifier in the name (e.g., GWA-9BR). Bedrock monitoring
wells are defined as wells that are screened across water-bearing fractures wholly within fresh,
competent bedrock.
At these locations, continuous coring will be performed from refusal to a depth of at least 50 feet
into competent bedrock. Packer testing will be performed on select fractures observed in the
rock cores. See Section 7.1.6 for details regarding packer test implementation.
Water sources to be used in rock coring and packer tests will be sampled for all of the
constituents in Table 11 before use.
Rock cores will be logged in accordance with the Field Guide for Rock Core Logging and
Fracture Analysis by Midwest GeoSciences Group. Percent recovery and RQD will be
calculated in the field. The cores will be photographed and retained.
At each of these locations, a double-cased well will be constructed with a 6-inch-diameter PVC
outer casing and a 2-inch-diameter PVC inner casing and well screen. Outer well casings will
be advanced through the transition zone and set approximately 1 foot into competent bedrock.
The annulus between the borehole and casing will be grouted to the surface using the tremie
grout method. After the grout has been allowed to cure for a period of 24 hours, the borehole
will be extended via coring approximately 50 feet into competent bedrock using an HQ core
barrel. A 2-inch-diameter well with a 5-foot, pre-packed well screen will be set at depth across
an interpreted water-bearing fracture or fracture zone, based on the results of packer testing.
Note that location-specific subsurface geology will dictate actual casing depths and screen
placement on a per-well basis.
7.1.5 Well Completion and Development
WELL COMPLETION
As described above, pre-packed screens will be installed around the monitoring well screens to
reduce turbidity during sample collection. The pre-packed screens will consist of environmental
grade sand contained within a stainless steel wire mesh cylinder. The sand gradation in the
pre-packed screen will be made in advance anticipating a wide range of site conditions;
however, HDR believes that the sand will typically be 20/40 mesh silica sand. The
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Geologist/Engineer involved with the specific installation will evaluate field conditions and
determine if changes are required. A minimum one to two-foot-thick bentonite pellet seal,
hydrated with potable water, will be placed above the pre-packed screen. Cement grout will be
placed in the annular space between the PVC casing and the borehole above the bentonite
pellet seal and extending to the ground surface. Each well will be finished at the ground surface
with a two-foot- square concrete well pad and new four-inch or eight-inch steel, above-grade
lockable covers. Following completion, all wells will be locked with a keyed pad lock.
WELL DEVELOPMENT
All newly installed monitoring wells will be developed to create an effective filter pack around the
well screen and to remove fine particles within the well from the formation near the borehole.
Based on site-specific conditions per 15A NCAC 02C .0108(p), appropriate measures (e.g.,
agitation, surging, pumping, etc.) will be utilized to stress the formation around the screen and
the filter pack so that mobile fines, silts, and clays are pulled into the well and removed.
Water quality parameters (specific conductance, pH, temperature, oxidation-reduction potential
(ORP), and turbidity) will be measured and recorded during development and should stabilize
before development is considered complete. Development will continue until development
water is visually clear (< 10 Nephelometric Turbidity Units (NTU) Turbidity) and sediment free as
determined by the absence of settled solids.
If a well cannot be developed to produce low turbidity (< 10 NTU) groundwater samples,
NCDENR will be notified and supplied with the well completion and development measures that
have been employed to make a determination if the turbidity is an artifact of the geologic
materials in which the well is screened.
Following development, sounding the bottom of the well with a water level meter should indicate
a “hard” (sediment-free) bottom. Development records will be prepared under the direction of
the Project Scientist/Engineer and will include development method(s), water volume removed,
and field measurements of temperature, pH, conductivity, and turbidity.
7.1.6 Hydrogeologic Evaluation Testing
In order to better characterize hydrogeologic conditions at the site, falling and constant head
tests, packers tests, and slug tests will be performed as described below. Data obtained from
these tests will be used in groundwater modeling. In addition, historical soil boring data at the
site will be utilized as appropriate to better characterize hydrogeologic conditions and will be
used for groundwater modeling. All water meters, pressure gages, and pressure transducers
will be calibrated per specifications for testing.
FALLING/CONSTANT HEAD TESTS
A minimum of five (5) in-situ borehole horizontal permeability tests, either falling or constant
head tests, will be performed just below refusal in the upper bedrock (transition zone if present).
In each of the hydrostratigraphic units above refusal (ash, fill, alluvium, soil/saprolite), a
minimum of ten falling or constant head tests (five for vertical permeability and five for horizontal
permeability) will be performed. The tests will be at locations based on site-specific conditions
at the time of assessment work. The U.S. Bureau of Reclamation (1995) test method and
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calculation procedures as described in Chapter 10 of their Ground Water Manual (2nd Edition)
will be used.
PACKER TESTS
A minimum of five (5) packer tests using a double packer system will be performed in deep
well/transition zone borings at locations based on site-specific conditions, as well as a minimum
of one (1) packer test in each soil/rock core well boring, as described in Section 7.1.4 after
completion of the holes. Packer tests will utilize a double packer system and the interval (5 feet
or 10 feet based on field conditions) to be tested will be based on observation of the rock core
and will be selected by the Lead Geologist/Engineer. The U.S. Bureau of Reclamation (1995)
test method and calculation procedures as described in Chapter 10 of their Ground Water
Manual (2nd Edition) will be used.
SLUG TESTS
Hydraulic conductivity (slug) tests will be completed in all installed monitoring wells under the
direction of the Lead Geologist/Engineer. Slug tests will be performed to meet the requirements
of the NCDENR Memorandum titled, “Performance and Analysis of Aquifer Slug Tests and
Pumping Tests Policy,” dated May 31, 2007. Water level change during the slug tests will be
recorded by a data logger. The slug test will be performed for no less than ten minutes, or until
such time as the water level in the test well recovers 95% of its original pre-test level, whichever
occurs first. Slug tests will be terminated after two hours even if the 95% pre-test level is not
achieved. Slug test field data will be analyzed using the Aqtesolv (or similar) software using the
Bouwer and Rice method.
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 and ash basin dikes.
AS-series Wells – The AS-series well locations were selected to provide additional
groundwater quality data to evaluate the vertical extent of impacted groundwater in the
vicinity of the ash storage area and to evaluate the migration of potentially impacted
groundwater from beneath Cell 1 to Cell 2.
GWA-series Wells – The GWA-series well locations were selected to provide water
quality data beyond the ash basin waste boundary for use in groundwater modeling (i.e.,
to evaluate the horizontal and vertical extent of potentially impacted groundwater outside
the ash basin waste boundary).
BG-series Wells – These wells will be used to provide information on background water
quality. The background well locations were selected to provide additional physical
separation from possible influence of the ash basin on groundwater. These wells will
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also be useful in the statistical analysis to determine the site-specific background water
quality concentrations (SSBCs).
During low-flow purging and sampling, groundwater is pumped into a flow-through chamber at
flow rates that minimize or stabilize water level drawdown within the well. Indicator parameters
are measured over time (usually at 5-minute intervals). When parameters have stabilized within
±0.2 pH units and ±10 percent for temperature, conductivity, and dissolved oxygen (DO), and
±10 millivolts (mV) for oxidation-reduction potential (ORP) over three consecutive readings,
representative groundwater has been achieved for sampling. Turbidity levels of 10 NTU or less
will be targeted prior to sample collection. Purging will be discontinued and groundwater
samples will be obtained if turbidity levels of 10 NTU or less are not obtained after 2 hours of
continuous purging. Groundwater samples will be analyzed by a North Carolina certified
laboratory for the constituents included in Table 11. Select constituents will be analyzed for
total and dissolved concentrations.
In 2014, the Electric Power Research Institute published the results of a critical review that
presented the current state-of-knowledge concerning radioactive elements in CCPs and the
potential radiological impacts associated with management and disposal. The review found:
Despite the enrichment of radionuclides from coal to ash, this critical review did not
locate any published studies that suggested typical CCPs posed any significant
radiological risks above background in the disposal scenarios considered, and when
used in concrete products. These conclusions are consistent with previous
assessments. The USGS (1997) concluded that “Radioactive elements in coal and fly
ash should not be sources of alarm. The vast majority of coal and the majority of fly ash
are not significantly enriched in radioactive elements, or in associated radioactivity,
compared to common soils 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 sampling wells MW -3S/D and BG-1S/D for total combined radium (Ra-
226 and Ra-228) and will consult with DWR regional office to determine if additional wells are to
be sampled.
Groundwater sample results will be compared to Class GA Standards as found in 15A NCAC
02L .0202 Groundwater Quality Standards, last amended on April 1, 2013 (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 11).
7.2.1 Compliance and Voluntary Monitoring Wells
Groundwater samples will be collected from selected existing voluntary and/or compliance
monitoring wells. Prior to collecting groundwater samples from the existing voluntary and/or
compliance monitoring wells, the historical turbidity values at each of the wells will be evaluated.
For wells where turbidity levels have historically been greater than 10 NTUs, these wells will be
re-developed, as described above, prior to collecting groundwater samples. If the
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redevelopment does not reduce turbidity level, the well(s) will be replaced. The DWR regional
office will be contact prior to replacement of a compliance monitoring well.
7.2.2 Onsite Water Supply Well
Groundwater samples will be collected from the existing onsite water supply well using the
pumping system installed in the well. Water supply wells will be purged for a minimum of 15
minutes prior to collection of a sample. Water samples will be collected prior to any filtration
system.
7.2.3 Speciation of Select Inorganics
In addition to total analytes, speciation of select inorganics will be conducted for select sample
locations to characterize the aqueous chemistry and geochemistry in locations and depths of
concern. Inorganic speciation of iron (Fe(II), Fe(III)), manganese (Mn(II), Mn(IV)) and chromium
(Cr(III), Cr(VI)) in pore water samples collected from upper and lower elevations of ash within
the basin and in select groundwater and surface water samples collected outside the ash basin.
Laboratory analyses will be performed in accordance with the methods provided in Table 11.
Duke Energy proposes to speciate iron and manganese in pore water samples collected from
proposed wells AB-2S/SL/D, AB-3S/SL/D, AB-4S/SL/D, AB-8S/SL/D and AB-7S/SL/D, in
groundwater samples collected from compliance monitoring wells MW -6S/D, MW -9S, MW-10D,
MW -11S/D, and MW -12S/D, in groundwater samples collected from proposed wells BG-1S/D,
and in surface water samples collected from locations S-1A, S-1B, and S-1C.
Duke Energy proposes to speciate chromium in pore water samples collected from the
proposed wells listed above, in groundwater samples collected from compliance monitoring
wells MW -7S and MW -13D, in groundwater samples collected from proposed wells BG-1S/D,
and in surface water samples collected from locations S-1A, S-1B, and S-1C.
Analytical results from the seep sampling will be reviewed to determine if similar analyses are to
be performed for selected seep locations.
7.3 Surface Water, Sediment, and Seep Sampling
7.3.1 Surface Water Samples
WITHIN ASH BASIN
Surface water samples will be collected from Cells 1, 2, and 3 at the approximate open water
locations shown on Figure 3 (SW -AB1 through SW-AB7). At each location, two water samples
will be collected – one sample close to the surface (i.e., 0 to 1 foot from surface) and one
sample at a depth just above the ash surface (i.e., 1 foot to 2 feet above the ash to avoid
suspending the ash within the sample). Prior to sampling, the depth to ash will be measured by
slowly lowering a measuring stick or tape until the ash surface is encountered, being careful to
avoid suspending the ash. The depth to ash will be noted, and a sample thief will be slowly
lowered to the desired depth to collect the sample. The sample thief and sample will be
retrieved and the sample will be transferred to the appropriate sample containers provided by
the laboratory. In areas where the water body is less than 5 feet deep, one water sample will be
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collected from the location at a depth just above the ash surface. Ash basin surface water
samples will be analyzed for the same constituents as groundwater samples (Table 11). Select
constituents will be analyzed for total and dissolved concentrations.
OUTSIDE ASH BASIN
Two water samples will be collected from the surface water located west of the ash basin (SW-1
and SW -2) shown on Figure 3. The SW -2 location will be considered a background surface
water sample. A third surface water sample (S-1A) will be collected 3-feet below the surface of
a small pond located southeast of Cell 3 outside of Duke Energy property line. Duke will contact
the property owner and request permission to collect this sample. These surface water samples
will be analyzed for the same constituents as groundwater samples (Table 11). Select
constituents will be analyzed for total and dissolved concentrations.
Analytical results for surface water samples collected from outside the ash basin will be
compared to 15A NCAC 2B .0200 Classifications and Water Quality Standards Applicable to
Surface Waters and Wetlands of North Carolina (2B Standards), from the DWR, and EPA
Criteria Table, last amended on May 15, 2013.
7.3.2 Sediment Samples
Sediment samples will be collected from the bed surface of the surface water located west of
the ash basin (designated as SW -1 and SW -2) and the seep sample locations as shown on
Figure 3 (designated as S-1 through S-10, S-1B, and S-1C, respectively). Sediment samples S-
1B and S-1C are located off-site on adjacent property. Sample S-1B is located in a channel
below the dam of a small pond and sample S-1C is located where seepage emanates into the
channel from the west bank of the channel. Duke will contact the property owner and request
permission to collect this sample. The SW -2 location will be considered a background sediment
sample. The sediment samples will be analyzed for total inorganics using the same
constituents list proposed for the soil and ash samples.
7.3.3 Seep Samples
Water samples will be collected from the seep sample locations shown on Figure 3. These
seep sample locations (designated as S-1 through S-10, S-1B, and S-1C) will be collected near
the time of the monitoring well sampling to minimize concerns about potential temporal
variability between surface water and groundwater and analyzed for the constituents listed in
Table 11. Select constituents will be analyzed for total and dissolved concentrations. Seep
samples S-1B and S-1C are located off-site on adjacent property. Sample S-1B is located in a
channel below the dam of a small pond and sample S-1C is located where seepage emanates
into the channel from the west bank of the channel. Duke will contact the property owner and
request permission to collect this sample.
In March 2014, DENR conducted sampling of seeps and surface water locations at the site.
HDR does not have the analytical results from this sampling event at this time; however, once
data is received, HDR will review the data and determine if changes in the proposed seep or
surface water locations is needed.
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Analytical results from the seep sampling will be reviewed to determine if similar speciation
analyses as described in Section 7.2.3 are to be performed for selected seep locations.
After analytical results for seep samples are reviewed, a determination will be made concerning
collection of additional off-site seep samples. If it is determined that additional off site seep
samples are to be collected, the DWR regional office will be contacted.
7.4 Field and Sampling Quality Assurance/Quality Control
Procedures
Documentation of field activities will be completed using a combination of logbooks, field data
records (FDRs), sample tracking systems, and sample custody records. Site and field logbooks
are completed to provide a general record of activities and events that occur during each field
task. FDRs have been designated for each exploration and sample collection task, to provide a
complete record of data obtained during the activity.
7.4.1 Field Logbooks
The field logbooks provide a daily handwritten account of field activities. Logbooks are
hardcover books that are permanently bound. All entries are made in indelible ink, and
corrections are made with a single line with the author initials and date. Each page of the
logbook will be dated and initialed by the person completing the log. Partially completed pages
will have a line drawn through the unused portion at the end of each day with the author’s
initials. The following information is generally entered into the field logbooks:
The date and time of each entry. The daily log generally begins with the Pre-Job Safety
Brief,
A summary of important tasks or subtasks completed during the day,
A description of field tests completed in association with the daily task,
A description of samples collected including documentation of any quality control
samples that were prepared (rinse blanks, duplicates, matrix spike, split samples, etc.),
Documentation of equipment maintenance and calibration activities,
Documentation of equipment decontamination activities, and
Descriptions of deviations from the work plan.
7.4.2 Field Data Records
Sample FDRs contain sample collection and/or exploration details. A FDR is completed each
time a field sample is collected. The goal of the FDR is to document exploration and sample
collection methods, materials, dates and times, and sample locations and identifiers. Field
measurements and observations associated with a given exploration or sample collection task
are recorded on the FDRs. FDRs are maintained throughout the field program in files that
become a permanent record of field program activities.
7.4.3 Sample Identification
In order to ensure that each number for every field sample collected is unique, samples will be
identified by the sample location and depth interval, if applicable (e.g., MW -11S (5-6’). Samples
will be numbered in accordance with the proposed sample IDs shown on Figure 3.
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7.4.4 Field Equipment Calibration
Field sampling equipment (e.g., water quality meter) will be properly maintained and calibrated
prior to and during continued use to assure that measurements are accurate within the
limitations of the equipment. Personnel will follow the manufacturers’ instructions to determine if
the instruments are functioning within their established operation ranges. The calibration data
will be recorded on a FDR.
To be acceptable, a field test must be bracketed between acceptable calibration results.
The first check may be an initial calibration, but the second check must be a continuing
verification check.
Each field instrument must be calibrated prior to use.
Verify the calibration at no more than 24-hour intervals during use and at the end of the
use, if the instrument will not be used the next day or time periods greater than 24 hours.
Initial calibration and verification checks must meet the acceptance criteria
recommended by each instrument manufacturer.
If an initial calibration or verification check fails to meet the acceptance criteria,
immediately recalibrate the instrument or remove it from service.
If a calibration check fails to meet the acceptance criteria and it is not possible to
reanalyze the samples, the following actions must be taken:
- Report results between the last acceptable calibration check and the failed
calibration check as estimated (qualified with a “J”);
- Include a narrative of the problem; and
- Shorten the time period between verification checks or repair/replace the instrument.
If historically generated data demonstrate that a specific instrument remains stable for
extended periods of time, the interval between initial calibration and calibration checks
may be increased.
- Acceptable field data must be bracketed by acceptable checks. Data that are not
bracketed by acceptable checks must be qualified.
- Base the selected time interval on the shortest interval that the instrument maintains
stability.
- If an extended time interval is used and the instrument consistently fails to meet the
final calibration check, then the instrument may require maintenance to repair the
problem or the time period is too long and must be shortened.
For continuous monitoring equipment, acceptable field data must be bracketed by
acceptable checks or the data must be qualified.
Sampling or field measurement instruments determined to be malfunctioning will be repaired or
will be replaced with a new piece of equipment.
7.4.5 Sample Custody Requirements
A program of sample custody will be followed during sample handling activities in both field and
laboratory operations. This program is designed to assure that each sample is accounted for at
all times. The appropriate sampling and laboratory personnel will complete sample FDRs,
chain-of-custody records, and laboratory receipt sheets.
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The primary objective of sample custody procedures is to obtain an accurate written record that
can trace the handling of all samples during the sample collection process, through analysis,
until final disposition.
FIELD SAMPLE CUSTODY
Sample custody for samples collected during each sampling event will be maintained by the
personnel collecting the samples. Each sampler is responsible for documenting each sample
transfer, maintaining sample custody until the samples are shipped off-site, and sample
shipment. The sample custody protocol followed by the sampling personnel involves:
Documenting procedures and amounts of reagents or supplies (e.g., filters) which
become an integral part of the sample from sample preparation and preservation;
Recording sample locations, sample bottle identification, and specific sample acquisition
measures on appropriate forms;
Using sample labels to document all information necessary for effective sample tracking;
and,
Completing sample FDR forms to establish sample custody in the field before sample
shipment.
Prepared labels are normally developed for each sample prior to sample collection. At a
minimum, each label will contain:
Sample location and depth (if applicable),
Date and time collected,
Sampler identification, and
Analyses requested and applicable preservative.
A manually-prepared chain-of-custody record will be initiated at the time of sample collection.
The chain-of-custody record documents:
Sample handling procedures including sample location, sample number and number of
containers corresponding to each sample number;
The requested analysis and applicable preservative;
The dates and times of sample collection;
The names of the sampler(s) and the person shipping the samples (if applicable);
The date and time that samples were delivered for shipping (if applicable);
Shipping information (e.g., 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
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bag. A temperature blank provided by the laboratory will also be placed in each cooler prior to
shipment if required for the type of samples collected and analyses requested.
7.4.6 Quality Assurance and Quality Control Samples
The following Quality Assurance/Quality Control samples will be collected during the proposed
field activities:
Equipment rinse blanks (one per day);
Field Duplicates (one per 20 samples per sample medium)
Equipment rinse blanks will be collected from non-dedicated equipment used between wells and
from drilling equipment between soil samples. The field equipment is cleaned following
documented cleaning procedures. An aliquot of the final control rinse water is passed over the
cleaned equipment directly into a sample container and submitted for analysis. The equipment
rinse blanks enable evaluation of bias (systematic errors) that could occur due to
decontamination.
A field duplicate is a replicate sample prepared at the sampling locations from equal portions of
all sample aliquots combined to make the sample. Both the field duplicate and the sample are
collected at the same time, in the same container type, preserved in the same way, and
analyzed by the same laboratory as a measure of sampling and analytical precision.
Field QA/QC samples will be analyzed for the same constituents as proposed for the soil and
groundwater samples, as identified on Tables 10 and 11, respectively.
7.4.7 Decontamination Procedures
DECONTAMINATION PAD
A decontamination pad will be constructed for field cleaning of drilling equipment. The
decontamination pad will meet the following requirements:
The pad will be constructed in an area believed to be free of surface contamination.
The pad will be lined with a water-impermeable material with no seams within the pad.
The material should be easily replaced (disposable) or repairable.
If possible, the pad will be constructed on a level, paved surface to facilitate the removal
of decontamination water. This may be accomplished by either constructing the pad
with one corner lower than the rest or by creating a lined sump or pit in one corner.
Sawhorses or racks constructed to hold field equipment while being cleaned will be high
enough above ground to prevent equipment from being contacted by splashback during
decontamination.
Decontamination water will be allowed to percolate into the ground adjacent to the
decontamination pad. Containment and disposal of decontamination water is not required.
At the completion of field activities, the decontamination pad will be removed and any sump or
pit will be backfilled with appropriate material.
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DECONTAMINATION OF FIELD SAMPLING EQUIPMENT
Field sampling equipment will be decontaminated between sample locations using potable
water and phosphate and borax-free detergent solution and a brush, if necessary, to remove
particulate matter and surface films. Equipment will then be rinsed thoroughly with tap water to
remove detergent solution prior to use at the next sample location.
DECONTAMINATION OF DRILLING EQUIPMENT
Any downhole drilling equipment will be steam cleaned between boreholes. The following
procedure will be used for field cleaning augers, drill stems, rods, tools, and associated
downhole equipment.
Hollow-stem augers, bits, drilling rods, split-spoon samplers and other downhole
equipment will be placed on racks or sawhorses at least two feet above the floor of the
temporary decontamination pad. Soil, mud, and other material will be removed by hand,
brushes, and potable water. The equipment will be steam cleaned using a high
pressure, high temperature steam cleaner.
Downhole equipment will be rinsed thoroughly with potable water after steam cleaning.
The clean equipment will then be removed from the decontamination pad and either placed on
the drill rig, if mobilizing immediately to the next boring, or placed on and covered with clean,
unused plastic sheeting if not used immediately.
7.5 Site Hydrogeologic Conceptual Model
The data obtained during the proposed assessment will be supplemented by available reports
and data on site geotechnical, geologic, and hydrologic conditions to develop a site
hydrogeologic conceptual model (SCM). The scope of these efforts will depend upon site
conditions and existing geologic information for the site.
The SCM is a conceptual interpretation of the processes and characteristics of a site with
respect to the groundwater flow and other hydrologic processes at the site and will be a
refinement of the ICSM described in Section 5.0.
The NCDENR document, “Hydrogeologic Investigation and Reporting Policy Memorandum,”
dated May 31, 2007, will be used as general guidance. In general, components of the SCM will
consist of developing and describing the following aspects of the site: geologic/soil framework,
hydrologic framework, and the hydraulic properties of site materials. More specifically, the SCM
will describe how these aspects of the site affect the groundwater flow at the site. In addition to
these site aspects, the SCM will:
Describe the site and regional geology,
Present longitudinal and transverse cross-sections showing the hydrostratigraphic
layers,
Develop the hydrostratigraphic layer properties required for the groundwater model,
Present a groundwater contour map showing the potentiometric surface of the shallow
aquifer, and
Present information on horizontal and vertical groundwater gradients.
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The SCM will serve as the basis for developing understanding of the hydrogeologic
characteristics of the site and for developing a groundwater flow and transport model.
The historic site groundwater elevations and ash basin water elevations will be used to develop
an historic estimated seasonal high groundwater contour map for the site.
A fracture trace analysis will be performed for the site, as well as onsite/near-site geologic
mapping, to better understand site geology and to confirm and support the SCM.
7.6 Site-Specific Background Concentrations
Statistical analysis will be performed using methods outlined in the Resource Conservation and
Recovery Act (RCRA) Unified Guidance (USEPA, 2009, EPA 530/R-09-007) to develop SSBCs.
The SSBCs will be determined to assess whether or not exceedances can be attributed to
naturally occurring background concentrations or attributed to potential contamination.
Specifically, the relationship between exceedances and turbidity will be explored to determine
whether or not there is a possible correlation due to naturally occurring conditions and/or well
construction. Alternative background boring locations will be proposed to NCDENR if the
background wells shown on Figure 3 are found to not represent background conditions.
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 site hydrogeologic conceptual model (SCM),
from existing wells and boring information provided by Duke Energy, and from information
developed from the site investigation. The model will also be supplemented with additional
information developed by HDR from other Piedmont sites, as applicable. The SCM is a
conceptual interpretation of the processes and characteristics of a site with respect to the
groundwater flow and other hydrologic processes at the site. Development of the SCM is
discussed in Section 7.5.
Although the site is anticipated in general to conform to the LeGrand conceptual groundwater
model, due to the configuration of the ash basin, the additional possible source (ash storage
area), and the boundary conditions present at the site, HDR believes that a three-dimensional
groundwater model would be more appropriate than performing two-dimensional modeling. The
modeling process, the development of the model hydrostratigraphic layers, the model extent (or
domain), and the proposed model boundary conditions are presented below.
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7.7.1 MODFLOW/MT3DMS Model
The groundwater modeling will be performed under the direction of Dr. William Langley, P.E.,
Department of Civil and Environmental Engineering, University of North Carolina Charlotte
(UNCC). Groundwater flow and constituent fate and transport will be modeled using Visual
Modflow 2011.1 (flow engine USGS MODFLOW 2005 from SWS) and MT3DMS.
Duke Energy, HDR, and UNCC considered the appropriateness of using MODFLOW and
MT3DMS as compared to the use of MODFLOW coupled with a geochemical reaction code
such as PHREEQC. The decision to use MODFLOW and MT3DMS was based on the intensive
data requirements of PHREEQC, the complexity of developing an appropriate geochemical
model given the heterogeneous nature of Piedmont geology, and the general acceptance of
MODLFOW and MT3DMS. However, batch simulations of PHREEQC may be used to perform
sensitivity analyses of the proposed sorption constants used with MODFLOW/MT3DMS, as
described below, if geochemistry varies significantly across the site.
Additional factors that were considered in the decision to use MT3DMS as compared to a
reaction based code utilizing geochemical modeling were as follows:
1. Modeling the complete geochemical fate and transport of trace, minor, or major
constituents would require simultaneous modeling of the following in addition to
groundwater flow:
All major, minor, and trace constituents (in their respective species forms) in
aqueous, equilibrium (solid), and complexed phases
Solution pH, oxidation/reduction potential, alkalinity, dissolved oxygen, and
temperature
Reactions including oxidation/reduction, complexation, precipitation/dissolution, and
ion exchange
2. Transient versus steady-state reaction kinetics may need to be considered. In general,
equilibrium phases for trace constituents cannot be identified by mineralogical analysis.
In this case, speciation geochemical modeling is required to identify postulated solid
phases by their respective saturation indices.
3. If geochemical conditions across the site are not widely variable, an approach that
considers each modeled COPC as a single species in the dissolved and complexed, or
sorbed, phases is justified. The ratio of these two phases is prescribed by the sorption
coefficient Kd which has dimensions of volume (L3) per unit mass (M). The variation in
geochemical conditions can be considered, if needed, by examining pH,
oxidation/reduction potential, alkalinity, and dissolved oxygen, perhaps combined with
geochemical modeling, to justify the Kd approach utilized by MT3DMS. Geochemical
modeling using PHREEQC (Parkhurst et al. 2013) running in the batch mode can be
used to indicate the extent to which a COPC is subject to solubility constraints, a
variable Kd, or other processes.
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The groundwater model will be developed in general accordance with the guidelines found in
the Groundwater Modeling Policy, NCDENR DWQ, May 31, 2007 and based on discussions
previously conducted concerning groundwater modeling between Duke Energy, HDR, UNCC,
and NCDENR.
7.7.2 Development of Kd Terms
It is critical to determine the ability of the site soils to attenuate, adsorb, or through other
processes reduce the concentrations of COPCs that may impact groundwater. To determine the
capacity of the site soils to attenuate a COPC, the site-specific Kd terms will be developed by
UNCC utilizing soil samples collected during the site investigation. These Kd terms quantify the
equilibrium relationship between chemical constituents in the dissolved and sorbed phases.
For soils at the site, sorption is most likely the reversible, exchange-site type associated with
hydrous oxides of iron on weathered soil surfaces (NCDENR DWQ 2012). Experiments to
quantify sorption can be conducted using batch or column procedures (Daniels and Das 2014).
A batch sorption procedure generally consists of combining soil samples and solutions across a
range of soil-to-solution ratios, followed by shaking until chemical equilibrium is achieved. Initial
and final concentrations of chemicals in the solution determine the adsorbed amount of
chemical and provide data for developing plots of sorbed versus dissolved chemical and the
resultant Kd term. If the plot, or isotherm, is linear, the single-valued Kd is considered linear as
well. Depending on the chemical constituent and soil characteristics, non-linear isotherms may
also result (EPRI 2004).
The column sorption procedure consists of passing a solution of known chemical concentration
through a cylindrical column packed with the soil sample. Batch and column methods for
estimating sorption were considered in development of the Kd terms. UNCC recommends an
adaption of the column method (Daniels and Das 2014) to develop Kd estimates that are more
conservative and representative of in-situ conditions, especially with regard to soil-to-liquid
ratios.
Soil samples with measured dry density and maximum particle size will be placed in lab-scale
columns configured to operate in the up-flow mode. A solution with measured COPC
concentrations will be pumped through each column as effluent samples are collected at regular
intervals over time. When constituent breakthroughs are verified, a “clean” solution (no COPCs)
will be pumped through the columns and effluent samples will be collected as well. Samples will
be analyzed by inductively coupled plasma-mass spectroscopy (ICP-MS) and ion
chromatography (IC) in the Civil & Environmental Engineering laboratories at the EPIC Building,
UNC Charlotte. COPCs measured in the column effluent as a function of cumulative pore
volumes displaced will be analyzed using CXTFIT (Tang et al. 2010) to select the
appropriate adsorption model and associated parameters of the partition coefficient Kd, either
linear, Freundlich, or Langmuir. This allows use of a nonlinear partition coefficient in the event
that the linear partition coefficient is not suitable for the modeled input concentration range.
It is noted that some COPCs may have indeterminate Kd values by the column method due to
solubility constraints and background conditions. In this case, batch sorption tests will be
conducted in accordance with U.S. Environmental Protection Agency (EPA) Technical Resource
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Document EPA/530/SW -87/006-F, Batch-type Procedures for Estimating Soil Adsorption of
Chemicals. COPC-specific solutions will be used to prepare a range of soil-to-solution ratios.
After mixing, supernatant samples will be drawn and analyzed as described above. Plots of
sorbed versus dissolved COPC mass will be used to develop Kd terms. Batch tests will be
performed in triplicate.
When applied in the fate and transport modeling performed by MT3DMS, the Kds will determine
the extent to which COPC transport in groundwater flow is attenuated by sorption. In effect,
simulated COPC concentrations will be reduced, as will their rate of movement in advection in
groundwater.
Ten (10) soil core samples will be selected from representative material at the site for column
tests to be performed in triplicate. Additionally, batch Kd tests, if performed, will be executed in
triplicate.
These Kd terms will apply to the selected soil core samples and background geochemistry of
the test solution including pH and oxidation-reduction potential. In order to make these results
transferable to other soils and geochemical conditions at the site, UNCC recommends that the
core samples with derived Kds and 20 to 25 additional core samples be analyzed for hydrous
ferrous oxides (HFO) content, which is considered to the primary determinant of COPC sorption
capacity of soils at the site. In the groundwater modeling study, the correlation between derived
Kds and HFO content can be used to estimate Kd at other site locations where HFO and
background water geochemistry, especially pH and oxidation-reduction potential, are known. If
significant differences in water geochemistry are observed, batch geochemical modeling can be
used to refine the Kd estimate as described in Section 7.1.1. UNCC recommends that core
samples for Kd and HFO tests be taken from locations that are in the path of groundwater
flowing from the ash impoundments.
Determination of which COPCs will have Kd terms developed will be determined after review of
the analyses on the site ash and review of the site groundwater analyses results. The COPCs
selected will be considered simultaneously in each test. Competitive sorption is taken into
account implicitly in the lab-measured sorption terms as CPOCs are combined into a single test
solution. Significant competition sorption is not anticipated given that COPCs in groundwater,
where present, will be at trace levels.
7.7.3 MODFLOW/MT3DMS Modeling Process
The MODFLOW groundwater model will be developed using the hydrostratigraphic layer
geometry and properties of the site as described in this section. After the geometry and
properties of the model layers are input, the model will be calibrated to existing water levels
observed in the monitoring wells and ash basin. Infiltration into the areas outside of the ash
basin will be estimated based on available information. Infiltration within the basin will be
estimated based on available water balance information and pond elevation data provided by
Duke Energy.
The 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
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vary with time and as changes occur in the geochemical environment of the ash basin. Due to
factors such as quantity of a particular constituent found in ash, mineral complex, solubility, and
geochemical conditions, the rate of leaching and leached concentrations of constituents will vary
with time and respect to each other. The experience that UNCC brings to this process through
their years of working with leaching and characterization of ash, particularly with Duke Energy
ash, will be of particular value.
Since the ash within the basin has been placed over a number of years, the analytical results
from an ash sample collected during the groundwater assessment is unlikely to represent the
current concentrations that are present in the hydrologic pathway between the ash basin and a
particular groundwater monitoring well or other downgradient location.
As a result of these factors and due to the time period involved in groundwater flow,
concentrations may vary spatially over time, and
peak concentrations may not yet have arrived at compliance wells.
The selection of the initial concentrations and the predictions of the concentrations for
constituents with respect to time will be developed with consideration of the following:
Site specific analytical results from leach tests (SPLP) and from total digestion of ash
samples taken at varying locations and depths within the ash basin and ash storage
area. Note that the total digestion concentrations, if used, would be considered an upper
bound to concentrations and that the actual concentrations would be lower that the
results from the total digestion.
Analytical results from appropriate groundwater monitoring wells or surface water
sample locations outside of the ash basin.
Analytical results from monitoring wells installed in the ash basin pore water
(screened-in ash).
Published or other data on sequential leaching tests performed on similar ash.
The information above will be used with constituent concentrations measured at the compliance
boundary to calibrate the fate and transport model and to develop a representation of the
concentration with respect to time for a particular constituent. The starting time of the model will
correspond to the date that the ash basin was placed in service. The resulting model, which will
be consistent with the calibration targets mentioned above, can then be used to predict
concentrations over space and time.
The model calibration process will consist of varying hydraulic conductivity and retardation
within and between hydrostratigraphic units in a manner that is consistent with measured values
of hydraulic conductivity, sorption terms, groundwater levels, and COPC concentrations.
A sensitivity analysis will be performed for the fate and transport analyses.
The model report will contain the information required by Section II of the NCDENR modeling
guidelines, as applicable.
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7.7.4 Hydrostratigraphic Layer Development
The three-dimensional configuration of the groundwater model hydrostratigraphic layers for a
site will be developed using the Initial Site Conceptual Model (Section 5.0) and from pre-existing
data and data obtained during the site investigation process. The thickness and extent for the
various layers will be represented by a three-dimensional surface model for each
hydrostratigraphic layer. For most sites the hydrostratigraphic layers will include ash, fills (bot h
for dikes/dam and/or ash landfills/structural fills), soil/saprolite, transition zone (where present),
and bedrock (Section 5.3).
The boring data from the site investigation and from existing boring data, as available and
provided by Duke Energy, will be entered into the RockWorks16TM program. This program,
along with site-specific and regional knowledge of Piedmont hydrogeology, will be used to
interpret and develop the layer thickness and extent across areas of the site where boring data
is not available. The material layers will be categorized based on physical and material
properties such as standard penetration blow count for soil/saprolite, and percent recovery and
RQD for the transition zone and bedrock. The material properties required for the model such as
total porosity, effective porosity, and specific storage for ash, fill, alluvium, and soil/saprolite will
be developed from laboratory testing (grain size analysis as described in Section 7.1.1) and
published data. Hydraulic conductivity (horizontal and vertical) of all layers will be developed
utilizing existing site data, in-situ permeability testing (falling head, constant head, and packer
testing where appropriate), slug tests in completed monitoring wells, laboratory testing of
undisturbed samples (ash, fill, soil/saprolite), and from an extensive database of Piedmont soil
and rock properties developed by HDR (Sections 7.1.1 and 7.1.6). The effective porosity
(primarily fracture porosity) and specific storage of the transition zone and bedrock will be
estimated from published data.
7.7.5 Domain of Conceptual Groundwater Flow Model
The BCCS Ash Basin model domain encompasses that area where groundwater flow will be
simulated to estimate the impacts of coal ash stored at the site. By necessity, the conceptual
model domain extends beyond the ash basin and ash storage area limits to physical or artificial
hydraulic boundaries such that groundwater flow through the area is accurately simulated.
Physical hydraulic boundary types may include specified head, head dependent flux, no-flow,
and recharge at ground surface or water surface. Artificial boundaries, which are developed
based on information from the site investigation, may include the specified head and no-flow
types.
The BSS model domain is planned to be bounded by the southern shore of the Yadkin River to
the north, the unnamed stream and drainage feature to the west between the Yadkin River and
Long Ferry Road, the drainage divide approximately defined by Long Ferry and Leonard Roads
to the south, the drainage feature, small pond, and unnamed stream to the east between
Leonard Road and the Yadkin River.
The lower limit of the model domain coincides with the maximum depth of water yielding
fractures in bedrock. The upper limit coincides with the upper surface of soil, fill, ash, landfilled
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materials, or ash basin water surface, where present. The basis for selecting these boundaries
is described in the following section.
7.7.6 Boundary Conditions for Conceptual Groundwater Flow Model
The northern shore of the Yadkin River is considered to be the specified head type where the
head is the average annual river stage for steady-state simulations, or the stage observed
simultaneously with groundwater level measurements at the site. The Yadkin River is
considered to be the ultimate discharge boundary for all groundwater flowing through the model
domain. The unnamed stream and drainage feature to the west between the Yadkin River and
Long Ferry Road is considered to be the specified head type where the head is approximated
by the water surface of the ephemeral stream, and the no-flow type where there is no surface
water flow. The drainage divide approximately defined by Long Ferry and Leonard Roads to the
south is considered to be the no-flow type. The drainage feature, small pond and unnamed
stream to the east between Leonard Road and the Yadkin River is considered to be the
specified head type where is the head is approximated by the water surface of the ephemeral
stream and pond, and the no-flow type where there is no surface water flow. Stream flow and
seepage measurements, as needed, will be performed to assist in model calibration.
The upper boundary across the site is the recharge type, where recharge is dependent on
regional precipitation estimates and land cover type, either soil, fill, or ash.
Given that the hydrostratigraphic zones across the site are hydraulically connected, these
boundaries are considered to be applicable to both local (shallow) and regional (deep)
groundwater flow. If site conditions are encountered that warrant changes to the proposed
extent of model, NCDENR will be notified.
7.7.7 Groundwater Impacts to Surface Water
If the groundwater modeling predicts exceedances of the 2L Standards at or beyond the
compliance boundary where the plume containing the exceedances would intercept surface
waters, the groundwater model results will be coupled with modeling of surface waters to predict
contaminant concentrations in the surface waters. This work would be performed by HDR in
conjunction with UNCC.
Model output from the fate and transport modeling (i.e. groundwater volume flux and
concentrations of constituents with exceedances of the 2L Standards) will be used as input for
surface water modeling in the adjacent water bodies (i.e., streams or reservoirs). The level of
surface water modeling will be determined based on the potential for water quality impacts in
the adjacent water body. That is, if the available mixing and dilution of the groundwater plume
in the water body is sufficient that surface water quality standards are expected to be attained
within a short distance a simple modeling approach will be used. If potential water quality
impacts are expected to be such that the simple model approach is not sufficient, or if the water
body type requires a more complex analysis, then a more detailed modeling approach will be
used. A brief description of the simple and detailed modeling approaches is presented below.
Simple Modeling Approach – This approach will include the effects of upstream flow on
dilution of the groundwater plume within allowable mixing zone limitations along with
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analytical solutions to the lateral spreading and mixing of the groundwater plume in the
adjacent water body. This approach will be similar to that presented in EPA’s Technical
Support Document for Water Quality based Toxics Control (EPA/505/2-90-001) for
ambient induced mixing that considers lateral dispersion coefficient, upstream flow and
shear velocity. The results from this analysis will provide information constituent
concentration as a function of the spatial distance from the groundwater input to the
adjacent water body.
Detailed Modeling Approach – This approach will involve the use of a water quality
model that is capable of representing a multi-dimensional analysis of the groundwater
plume mixing and dilution in the adjacent water body. This method involves segmenting
the water body into model segments (lateral, longitudinal and/or vertical) for calculating
the resulting constituent concentrations spatially in the water body either in a steady-
state or time-variable mode. The potential water quality models that could be used for
this approach include: QUAL2K; CE-QUAL-W2; EFDC/WASP; ECOMSED/RCA; or
other applicable models.
In either approach, the model output from the groundwater model will be coupled with the
surface water model to determine the resulting constituent concentrations in the adjacent water
body spatially from the point of input. These surface water modeling results can be used for
comparison to applicable surface water quality standards to complete determine compliance.
The development of the model inputs would require additional data for flow and chemical
characterization of the surface water that would potentially be impacted. The specific type of
data required (i.e., flow, chemical characterization, etc.) and the locations where this data would
be collected would depend on the surface water body and the modeling approach selected. If
modeling groundwater impacts to surface water is required, HDR and Duke Energy will consult
with the DWR regional office to present those specific data requirements and modeling
approach.
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8.0 RISK ASSESSMENT
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8.0 Risk Assessment
To support the groundwater assessment and inform corrective action decisions, potential risks
to human health and the environment will be assessed in accordance with applicable federal
and state guidance. Initially, screening level human health and ecological risk assessments will
be conducted that include development of conceptual site models (CSM) to serve as the
foundation for evaluating potential risks to human and ecological receptors at the site.
Consistent with standard risk assessment practice, separate CSMs will be developed for the
human health and ecological risk evaluations.
The purpose of the CSM is to identify potentially complete exposure pathways to environmental
media associated with the site and to specify the types of exposure scenarios relevant to
include in the risk analysis. The first step in constructing a CSM is to characterize the site and
surrounding area. Source areas and potential transport mechanisms are then identified,
followed by determination of potential receptors and routes of exposure. Potential exposure
pathways are determined to be complete when they contain the following aspects: 1) a
constituent source, 2) a mechanism of constituent release and transport from the source area to
an environmental medium, 3) a feasible route of potential exposure at the point of contact (e.g.,
ingestion, dermal contact, and inhalation). Completed exposure pathways identified in the CSM
are then evaluated in the risk assessment. Incomplete pathways are characterized by some
gaps in the links between site sources and exposure. Based on this lack of potential exposure,
incomplete pathways are not included in the estimation or characterization of potential risks,
since no exposure can occur via these pathways.
Preliminary constituents of potential concern (COPCs) for inclusion in the screening level risk
assessments will be identified based on the preliminary evaluations performed at the site in
conjunction with recommendations from NCDENR regarding coal ash constituents. Both
screening level risk assessments will compare maximum constituent concentrations to
appropriate risk-based screening values as a preliminary step in evaluating potential for risks to
receptors. Based on results of the screening level risk assessments, a refinement of COPCs
will be conducted and more definitive risk characterization will be performed as part of the
corrective action process if needed.
8.1 Human Health Risk Assessment
As noted above, the initial human health risk assessment (HHRA) will include the preparation of
a CSM, illustrating potential exposure pathways from the source area to possible receptors. The
information gathered in the CSM will be used in conjunction with analytical data collected as
part of the CSA. Although groundwater appears to be the primary exposure pathway for human
receptors, a screening level evaluation will be performed to determine if other potential
exposure routes exist.
The HHRA for the site will include an initial comparison of constituent concentrations in various
media to risk-based screening levels. The data will be screened against the following criteria:
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Soil analytical results will be compared to USEPA residential and industrial soil Regional
Screening Levels (RSLs) (USEPA, November 2014 or latest update)
Groundwater results will be compared to USEPA tap water RSLs (USEPA, October
2014) and NCDENR Title 15A, Subchapter 2L Standards (NCDENR, 2006).
Surface water analytical results will be compared to USEPA national recommended
water quality criteria and North Carolina surface water standards (USEPA, 2006;
NCDENR, 2007).
The surface water classification as it pertains to drinking water supply, aquatic life,
high/exceptional quality designations and other requirements for other activities (e.g.,
landfill permits, NPDES wastewater discharges) shall be noted.
Sediment results will be compared to USEPA residential soil RSLs (USEPA, November
2014 or latest update).
The soil, sediment, and ground water data will also be compared to available
background soil, sediment, and ground water data from previous monitoring and
investigations.
The results of this comparison will be presented in a table, along with recommendations for
further evaluation.
8.1.1 Site-Specific Risk-Based Remediation Standards
If deemed necessary, based on the results of the initial comparison to standards, site-and
media-specific risk-based remediation standards will be calculated in accordance with the
Eligibility Requirements and Procedures for Risk-Based Remediation of Industrial Sites
Pursuant to N.C.G.S. 130A-310.65 to 310.77, North Carolina Department of Environment and
Natural Resources, Division of Waste Management, 29 July 2011.
These calculations will include an evaluation of the following, based on site-specific activities
and conditions:
Remediation methods and technologies resulting in emissions of air pollutants are to
comply with applicable air quality standards adopted by the Environmental Management
Commission (Commission).
Site-specific remediation standards for surface waters are to be the water quality
standards adopted by the Commission.
The current and probable future use of groundwater shall be identified and protected.
Site-specific sources of contaminants and potential receptors are to be identified,
protected, controlled, or eliminated whether on or off the site of the contaminant source.
Natural environmental conditions affecting the fate and transport of contaminants (e.g.,
natural attenuation) shall be determined by appropriate scientific methods.
Permits for facilities subject to the programs or requirements of G.S. 130A-310.67(a)
shall include conditions to avoid exceedances of applicable groundwater standards
pursuant to Article 21 of Chapter 143 of the General Statutes; permitted facilities shall be
designed to avoid exceedances of the North Carolina ground or surface water
standards.
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Soil shall be remediated to levels that no longer constitute a continuing source of
groundwater contamination in excess of the site-specific groundwater remediation
standards approved for the site.
The potential for human inhalation of contaminants from the outdoor air and other site-
specific indoor air exposure pathways shall be considered during remediation, if
applicable.
The site-specific remediation standard shall protect against human exposure to
contamination through the consumption of contaminated fish or wildlife and through the
ingestion of contaminants in surface water or groundwater supplies.
For known or suspected carcinogens, site-specific remediation standards shall be
established at levels not to exceed an excess lifetime cancer risk of one in a million. The
site-specific remediation standard may depart from this level based on the criteria set out
in 40 Code of Federal Regulations § 300.430(e)(9) (July 1, 2003). The cumulative
excess lifetime cancer risk to an exposed individual shall not be greater than one in
10,000 based on the sum of carcinogenic risk posed by each contaminant present.
For systemic toxicants (non-carcinogens), site-specific remediation standards shall be
set at levels to which the human population, including sensitive subgroups, may be
exposed without any adverse health effect during a lifetime or part of a lifetime. Site-
specific remediation standards for systemic toxicants shall incorporate an adequate
margin of safety and shall take into account cases where two or more systemic toxicants
affect the same organ or organ system.
A comparison will also be made between the concentrations detected in ground water
and the constituent specific primary drinking water standards, as well as the
concentrations in impacted vs. background levels to determine if there are other
considerations that will need to be addressed in risk management decision making.
The site-specific remediation standards for each medium shall be adequate to avoid
foreseeable adverse effects to other media or the environment that are inconsistent with the
state’s risk-based approach.
8.2 Ecological Risk Assessment
The screening level ecological risk assessment (SLERA) for the site will begin with a description
of the ecological setting and development of the ecological CSM specific to the ecological
communities and receptors that may potential be at risk. This scope is equivalent to Step 1:
preliminary problem formulation and ecological effects evaluation (USEPA, 1998).
The screening level evaluation will include compilation of a list of potential ecological receptors
(e.g., plants, benthic invertebrates, fish, birds, etc.). Additionally, an evaluation of sensitive
ecological populations will be performed. Preliminary information on listed rare animal species
at or near the site will be compiled from the North Carolina Natural Heritage Program database
and U.S. Fish and Wildlife Service (USFWS) county list to evaluate the potential for presence of
rare or endangered animal and plant species. Rare natural communities will also be evaluated
and identified if near the site.
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Appropriate state and federal natural resource trustees and their representatives (e.g., USFWS)
will be contacted to determine the potential presence (or lack thereof) of sensitive species or
their critical habitat at the time the screening is performed. If it is determined a sensitive species
or critical habitat is present or potentially present, a survey of the appropriate area will be
conducted. If it is found that sensitive species are utilizing the site, or may in the future, a
finding concerning the likelihood of effects due to site-related contaminants or activities should
be developed and presented to the trustee agency.
The preliminary ecological risk screening will also include, as the basis for the CSM, a
description of the known fate and transport mechanisms for site-related constituents and
potentially complete pathways from assumed source to receptor. An ecological checklist will be
completed for the site as required by Guidelines for Performing Screening Level Ecological Risk
Assessment within North Carolina (NCDENR, 2003).
Following completion of Step 1, the screening level exposure estimate and risk calculations
(Step 2), will be performed in accordance with the Guidelines for Performing Screening Level
Ecological Risk Assessment within North Carolina (NCDENR, 2003). Step 2 estimates the level
of a constituent a plant or animal is exposed to at the site and compares the maximum
constituent concentrations to Ecological Screening Values (ESVs).
Maximum detected concentrations or the maximum detection limit for non-detected constituents
of potential concern (those metals or other chemicals present in site media that may result in
risk to ecological receptors) will be compared to applicable ecological screening values intended
to be protective of ecological receptors (including those sensitive species and communities
noted above, where available) to derive a hazard quotient (HQ). An HQ greater than 1 indicates
potential ecological impacts cannot be ruled out.
ESVs will be taken from the following and other appropriate sources:
USEPA Ecological Soil Screening Levels
USEPA Region 4 Recommended Ecological Screening Values
USEPA National Recommended Water Quality Criteria and North Carolina Standards
The state’s SLERA guidance (NCDENR, 2003) requires that constituents be identified as a Step
2 COPC as follows:
Category 1 – Contaminants with a maximum detection exceeding the ESV
Category 2 – Undetected contaminants with a laboratory sample quantitation limit
exceeding the ESV
Category 3 – Detected contaminants with no ESV
Category 4 – Undetected contaminants with no ESV
Exceedances of the ESVs indicate the potential need for further evaluation of ecological risks at
the site. The frequency, magnitude, pattern and basis of any exceedances should also be
considered.
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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).
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9.0 CSA REPORT
48
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.
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Orthophoto potentiometric difference maps showing the difference in vertical heads
between selected flow zones.
Orthophoto iso-concentration maps for selected COCs and flow zones.
Orthophoto map showing the relationship between groundwater and surface water
samples for selected COCs.
Geologic cross-sections.
Photographs of select split-spoon samples and cores at each boring location.
Others as appropriate.
Recommendations will be provided in the CSA report for a sampling plan to be performed after
completion of this groundwater assessment. The sampling plan will describe the recommended
sampling frequency, constituent and parameter list, and proposed sampling locations including
monitoring wells, seeps, and surface sample locations as required.
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10.0 PROPOSED SCHEDULE
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10.0 Proposed Schedule
Duke Energy will submit the CSA Report within 180 days of NCDENR approval of this Work
Plan. The anticipated schedule for implementation of field work, evaluation of data, and
preparation of the Work Plan is presented in the table below.
Activity Start Date Duration to Complete
Field Exploration Program 10 days following Work Plan approval 75 days
Receive Laboratory Data 14 days following end of Exploration Program 15 days
Evaluate Lab/Field Data, Develop SCM 5 days following receipt of Lab Data 30 days
Prepare and Submit CSA 10 days following Work Plan approval 170 days
The following permits and approvals from NCDENR are potentially required:
After the access requirements for the proposed well locations are determined, if
required, an application for an erosion and sediment control permit will be submitted to
the Division of Energy, Mineral and Land Resources, Land Quality Section.
Installation of monitoring wells on the dams and/or dikes must be approved by the
Division of Energy, Mineral and Land Resources Dam Safety Section before drilling can
begin. Information on the location and well installation construction will be submitted as
soon as the locations are finalized.
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11.0 REFERENCES
51
11.0 References
1. Certificate of Public Convenience and Necessity (“CPCN”) for the Buck Combined Cycle
Project, 2007 at http://www.duke-energy.com/pdfs/Buck-Updated-Preliminary-CPCN-
Final-06-29-07.pdf
2. Cunningham, W. L. and C. C. Daniels, III. 2001. Investigation of ground-water availability
and quality in Orange County, North Carolina: U. S. Geological Survey, Water-
Resources Investigations Report 00-4286, 59p
3. Daniel, C.C., III, and Sharpless, N.B., 1983, Ground-water supply potential and
procedures for well-site selection upper Cape Fear basin, Cape Fear basin study, 1981-
1983: North Carolina Department of Natural Resources and Community Development
and U.S. Water Resources Council in cooperation with the U.S. Geological Survey, 73 p.
4. Daniels, John L. and Das, Gautam P. 2014. Practical Leachability and Sorption
Considerations for Ash Management, Geo-Congress 2014 Technical Papers: Geo-
characterization and Modeling for Sustainability. Wentworth Institute of technology,
Boston, MA.
5. Electric Power Research Institute (EPRI), 1993. Electric Power Research Institute,
Physical and Hydraulic Properties of Fly Ash and Other By-Products from Coal
Combustion, EPRI TR-101999. February 1993.
6. EPRI. 2009. Electric Power Research Institute, Technical Update – Coal Combustion
Products – Environmental Issues – Coal Ash: Characteristics, Management and
Environmental Issues, EPRI 1019022. September 2009.
7. EPRI 2014. Assessment of Radioactive Elements in Coal Combustion Products, 2014
Technical Report 3002003774, Final Report August 2014.
8. EPRI 2004 Electric Power Research Institute, “Chemical Attenuation Coefficients for
Arsenic Species Using Soil Samples Collected from Selected Power Plant Sites:
Laboratory Studies”, Product ID:1005505, December 2004.
9. Fenneman, Nevin Melancthon, 1938. “Physiography of eastern United States.”
McGraw-Hill. 1938.
10. Freeze, R. A., J. A. and Cherry, Ground Water, Englewood Cliffs, NJ, Prentice-Hall,
1979.
11. Gillispie, EC., Austin, R., Abraham, J., Wang, S., Bolich, R., Bradley, P., Amoozegar, A.,
Duckworth, O., Hesterberg, D., and Polizzotto, ML. Sources and variability of
manganese in well water of the North Carolina Piedmont. Water Resources Research
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Institute of the University of North Carolina System Annual 2014 Conference, Raleigh,
NC, March 2014. Poster Presentation.
12. Harned, D. A. and Daniel, C. C., III, 1992, The transition zone between bedrock and
regolith: Conduit for contamination?, p. 336-348, in Daniel, C. C., III, White, R. K., and
Stone, P. A., eds., Groundwater in the Piedmont: Proceedings of a Conference on
Ground Water in the Piedmont of the Eastern United States, October 16-18, 1989,
Clemson University, 693p.
13. HDR, 2014A. “Buck Combined Cycle Ash Basin Drinking Water Supply Well and
Receptor Survey, NPDES Permit NC0004774.”
14. HDR, 2014B. “Buck Combined Cycle Ash Basin Supplement to Drinking Water Supply
Well and Receptor Survey.”
15. HDR, 2014C. “Data Report: Buck Steam Station Ash Basin Closure – Conceptual
Design- Draft.”
16. Heath, R.C., 1980, Basic elements of groundwater hydrology with reference to
conditions in North Carolina: U.S. Geo-logical Survey Open-File Report 80–44, 86 p.
17. Heath, R.C. 1984, “Ground-water regions of the United States.” U.S. Geological Survey
Water-Supply Paper 2242, 78 p.
18. Krauskopf, K.B., 1972. Geochemistry of micronutrients: in Micronutrients in Agriculture,
J.J. Mortvedt, F.R. Cox, L.M. Shuman, and R.M. Walsh, eds., Soil Science Society of
America, Madison, Wisconsin, p. 7-36.
19. LeGrand, H.E. 1988. Region 21, Piedmont and Blue Ridge. In Hydrogeology, The
Geology of North America, vol. 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. NCDENR, 2003. Division of Waste Management - Guidelines for Performing Screening
Level Ecological Risk Assessments within North Carolina.
23. NCDENR Memorandum “Performance and Analysis of Aquifer Slug Tests and Pumping
Tests Policy,” May 31, 2007.
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24. NCDENR document, “Hydrogeologic Investigation and Reporting Policy Memorandum,”
dated May 31, 2007.
25. NCDENR DWQ NCDENR Division of Water Quality, “Evaluating Metals in Groundwater
at DWQ Permitted Facilities: A Technical Assistance Document for DWQ Staff”, July
2013.
26. Parkhurst, D.L., and Appelo, C.A.J., 2013, Description of input and examples for
PHREEQC version 3—A computer program for speciation, batch-reaction, one-
dimensional transport, and inverse geochemical calculations: U.S. Geological Survey
Techniques and Methods, book 6, chap. A43, 497 p.
27. Tang, G., Mayes, M. A., Parker, J. C., & Jardine, P. M. (2010). CXTFIT/Excel–A modular
adaptable code for parameter estimation, sensitivity analysis and uncertainty analysis for
laboratory or field tracer experiments. Computers & Geosciences, 36(9), 1200-1209.
28. USEPA, 1987. Batch-type procedures for estimating soil adsorption of chemicals
Technical Resource Document 530/SW -87/006-F.
29. USEPA, 1997. Ecological Risk Assessment Guidance for Superfund: Process for
Designing and Conducting Ecological Risk Assessments
30. USEPA, 2001. Region 4 Ecological Risk Assessment Bulletins—Supplement to RAGS.
31. USEPA, 1998. Guidelines for Ecological Risk Assessment.
32. US FWS, 2009. Range-wide Indiana Bat Protection and Enhancement Plan Guidelines,
at http://www.fws.gov/frankfort/pdf/inbatpepguidelines.pdf.
33. US Geological Survey Geological Survey, Akio Ogata and R.B. Banks Professional
Paper 411-A “A Solution of Differential Equation of Longitudinal Dispersion in Porous
Media”, 1961
34. US Geological Survey (USGS). 1997. Radioactive elements in coal and fly ash:
abundance, forms, and environmental significance. U.S. Geological Survey Fact Sheet
FS-163-97.
35. USEPA, 1998. Study of Hazardous Air Pollutant Emissions from Electric Utility Steam
Generating Units—Final Report to Congress. Volume 1. Office of Air Quality, Planning
and Standards. Research Triangle Park, NC 27711, EPA-453/R-98-004a.
36. USEPA, 1998. Report to Congress Wastes from the Combustion of Fossil Fuels, Volume
2 Methods, Findings, and Recommendations.
Figures
YADKIN RIVERBC-23BC-22BC-11/12BC-36BC-37CELL 3SECONDARY PONDCELL 1ADDITIONAL PRIMARY PONDBUCK STEAM STATIONCOAL FIRED UNITS 1-6YADKIN RIVERLE
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CELL 2PRIMARY PONDCELL 1DISCHARGE TOWERCELL 2DISCHARGE TOWERCELL 3DISCHARGE TOWERYADKIN RIVERMW-13DMW-6SMW-6DMW-7SMW-7DMW-12SMW-12DMW-4DMW-4SBC-30SBC-30D-2MW-8SMW-8DMW-9SMW-9DBC-18BG-3AS-5AB-3S/SL/DSW-AB2SW-AB3SW-AB7SW-AB1AB-2S/SL/DAB-1DGWA-11S/DGWA-10S/DBG-1S/D/BRGWA-13S/DGWA-9S/D/BRGWA-8DGWA-7S/DGWA-6S/DGWA-5S/DGWA-4S/DGWA-3S/DAB-6DAB-5S/SL/DAB-4S/SL/DAB-7S/SL/DAB-8S/SL/DSW-AB4GWA-2D/BRAS-1S/DAS-3S/DBG-3S/DAB-10S/DSW-AB5SW-AB6AB-9S/D/BRGWA-12S/DBG-2S/DSW-2SW-1GWA-14S/DGWA-17DGWA 19S/DGWA-12S/DGWA-16S/DGWA-15S/DGWA-18DGWA 20S/DBC-20SBC-20DPWS ID: 0180647LEGEND:DUKE ENERGY PROPERTY BOUNDARYWASTE BOUNDARYASH STORAGE AREA BOUNDARYCOMPLIANCE BOUNDARYCOMPLIANCE BOUNDARY COINCIDENT WITH DUKEPROPERTY BOUNDARYSTREAMTOPOGRAPHIC CONTOUR (4-FT INTERVAL)*EXISTING ASH BASIN COMPLIANCE GROUNDWATERMONITORING WELLEXISTING ASH BASIN VOLUNTARY GROUNDWATERMONITORING WELLEXISTING ASH BASIN CLOSURE GROUNDWATERMONITORING WELL (HDR 2013)EXISTING ASH BASIN CLOSURE GROUNDWATEROBSERVATION WELL (HDR 2013)PROPOSED SOIL BORING/GROUNDWATER MONITORINGWELL LOCATIONPROPOSED POTENTIAL ADDITIONALBORING/GROUNDWATER MONITORING WELL LOCATIONPROPOSED SURFACE WATER SAMPLE LOCATIONPROPOSED SURFACE WATER AND SEDIMENT SAMPLELOCATIONPROPOSED SEEP SURFACE WATER AND SEDIMENT SAMPLELOCATIONEXISTING PUBLIC WATER SUPPLY WELLP5%#.'
(''6 NOTES:1. PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE.2. WASTE BOUNDARY AND ASH STORAGE AREA BOUNDARY ARE APPROXIMATE.3. AS-BUILT MONITORING WELL LOCATIONS PROVIDED BY DUKE ENERGY AND WSP.4. COMPLIANCE SHALLOW MONITORING WELLS (S) ARE SCREENED ACROSS THE SURFICIAL WATER TABLE.5. COMPLIANCE DEEP MONITORING WELLS (D) ARE SCREENED IN THE TRANSITION ZONE BETWEEN COMPETENT BEDROCK AND THE REGOLITH.6. TOPOGRAPHY DATA FOR THE SITE WAS OBTAINED FROM WSP DATED NOVEMBER 2013.7. AERIAL PHOTOGRAPHY WAS OBTAINED FROM WSP DATED APRIL 17, 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 BASED ON FIELD CONDITIONS.10. SEEP SAMPLE LOCATIONS WERE OBTAINED BY HDR USING A TRIMBLE HANDHELD GPS UNIT.* TOPOGRAPHIC CONTOURS LOCATED WITHIN THE WASTE BOUNDARY AND OTHERS SPECIFIC AREAS SUCH AS DAMS, DIKES, ETC. ARE 2-FT CONTOUR INTERVALS.PROPOSED MONITORING WELL AND SAMPLE LOCATION MAPBUCK COMBINED CYCLE STATION ASH BASINDUKE ENERGY CAROLINAS, LLCDATEFIGURENPDES PERMIT NO. NC0004774
BC-23BC-22BC-11/12BC-36BC-37CELL 3SECONDARY PONDCELL 1ADDITIONAL PRIMARY PONDBUCK STEAM STATIONCOAL FIRED UNITS 1-6YADKIN RIVERLE
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DUKEVILLE ROAD
CELL 2PRIMARY PONDCELL 1DISCHARGE TOWERCELL 2DISCHARGE TOWERCELL 3DISCHARGE TOWERYADKIN RIVERBC-20SBC-20DMW-13DMW-6SMW-6DMW-7SMW-7DMW-5SMW-5DMW-12SMW-12DMW-4DMW-4SBC-30SBC-30D-2MW-8SMW-8DMW-9SMW-9DBC-18BG-3APWS ID: 0180647LEGEND:DUKE ENERGY PROPERTY BOUNDARYWASTE BOUNDARYASH STORAGE AREA BOUNDARYCOMPLIANCE BOUNDARYCOMPLIANCE BOUNDARY COINCIDENTWITH DUKE PROPERTY BOUNDARYSTREAMTOPOGRAPHIC CONTOUR (4-FT INTERVAL)*EXISTING ASH BASIN COMPLIANCEGROUNDWATER MONITORING WELLEXISTING ASH BASIN VOLUNTARYGROUNDWATER MONITORING WELLEXISTING ASH BASIN CLOSURE GROUNDWATERMONITORING WELL (HDR 2013)EXISTING ASH BASIN CLOSURE GROUNDWATEROBSERVATION WELL (HDR 2013)EXISTING PUBLIC WATER SUPPLY WELLP5%#.'
(''6 NOTES:1. PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE.2. WASTE BOUNDARY AND ASH STORAGE AREA BOUNDARY ARE APPROXIMATE.3. AS-BUILT MONITORING WELL LOCATIONS PROVIDED BY DUKE ENERGY AND WSP.4. COMPLIANCE SHALLOW MONITORING WELLS (S) ARE SCREENED ACROSS THE SURFICIAL WATER TABLE.5. COMPLIANCE DEEP MONITORING WELLS (D) ARE SCREENED IN THE TRANSITION ZONE BETWEEN COMPETENT BEDROCK AND THE REGOLITH.6. TOPOGRAPHY DATA FOR THE SITE WAS OBTAINED FROM WSP DATED NOVEMBER 2013.7. AERIAL PHOTOGRAPHY WAS OBTAINED FROM WSP DATED APRIL 17, 2014.8. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L .0107 (a).* TOPOGRAPHIC CONTOURS LOCATED WITHIN THE WASTE BOUNDARY AND OTHERS SPECIFIC AREAS SUCH AS DAMS, DIKES, ETC. ARE 2-FT CONTOUR INTERVALS.SITE LAYOUT MAPBUCK COMBINED CYCLE STATION ASH BASINDUKE ENERGY CAROLINAS, LLCDATEFIGURENPDES PERMIT NO. NC0004774
Service Layer Credits: NC OneMap, NCCenter for Geographic Information andAnalysis, NC 911 Board
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Buck CombinedCycle Station
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L o n g F e r r y R d LongFerryRdLeonardRd Leonard Rd
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DATE
FIGURE
May 3, 2013
1
¢
1,000 0 1,000 2,000
Notes:1. Sources: US Topo; 2011, USGS National Map Aerial Imagery; 2010 North Carolina Statewide Orthoimagery, NC Geospatial & Technology Management OfficeSCALE (FEET)
SITE LOCATION MAPDUKE ENERGY CAROLINAS, LLCBUCK COMBINED CYCLE STATIONNPDES PERMIT NO. NC0004774ROWAN COUNTY, NORTH CAROLINA
Tables
Table 1. Groundwater Monitoring Requirements
Well Nomenclature Constituents and Parameters Frequency
Monitoring Wells: MW-6S,
MW-6D, MW-7S, MW-7D, MW-8S,
MW-8D, MW-9S, MW-9D, MW-10D,
MW-11S, MW-11D, MW-12S,
MW-12D, MW-13D
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
Tables - Page 1
TABLE 2 - EXCEEDANCES OF 2L STANDARDS MARCH 7, 2011 – JULY 1, 2014
Parameter Boron Chromium Iron Manganese pH Sulfate TDS
Units µg/L µg/L µg/L µg/L SU mg/L mg/L
2L Standard 700 10 300 50 6.5 - 8.5 250 500
Well ID Range of Exceedances
MW-6S No
Exceedances
No
Exceedances 323 59 – 135 4.5 – 5.5 No
Exceedances
No
Exceedances
MW-6D No
Exceedances
No
Exceedances
No
Exceedances
No
Exceedances 5.8 No
Exceedances
No
Exceedances
MW-7S No
Exceedances
No
Exceedances
No
Exceedances 55 – 71 5.8 – 6.2 No
Exceedances
No
Exceedances
MW-7D No
Exceedances
No
Exceedances 334 – 453 87 – 129 6.3 – 6.4 No
Exceedances
No
Exceedances
MW-8S No
Exceedances
No
Exceedances 559 – 7,610 62 – 360 6.0– 6.3 No
Exceedances
No
Exceedances
MW-8D No
Exceedances
No
Exceedances 307 – 432 No
Exceedances 6.2 – 6.4 No
Exceedances
No
Exceedances
MW-9S No
Exceedances
No
Exceedances 336 – 584 55 – 88 5.3 – 6.5 No
Exceedances
No
Exceedances
MW-9D No
Exceedances
No
Exceedances 370 No
Exceedances 5.2 – 6.5 No
Exceedances
No
Exceedances
MW-10D No
Exceedances
No
Exceedances 335 – 701 110 – 1,130 5.5 – 6.3 320 – 390 561 – 660
MW-11S No
Exceedances
No
Exceedances 316 – 1,150 106 – 242 5.8 – 6.3 No
Exceedances
No
Exceedances
MW-11D 1,130 – 1,290 No
Exceedances 318 – 7,340 56 – 125 5.5 – 6.0 No
Exceedances
No
Exceedances
MW-12S No
Exceedances 11 – 28 329 – 721 52 – 444 5.9 – 6.3 No
Exceedances
No
Exceedances
MW-12D No
Exceedances
No
Exceedances 530 – 1,070 No
Exceedances 5.9 – 6.4 No
Exceedances
No
Exceedances
MW-13D No
Exceedances
No
Exceedances 344 – 1,260 No
Exceedances 6.1 – 6.4 No
Exceedances
No
Exceedances
Tables - Page 2
Table 3 - SPLP Leaching Analytical Results
Antimony Arsenic Barium Boron Cadmium Chloride Chromium Copper Iron Lead Manganese Mercury Nickel Nitrate as N Selenium Sulfate TDS Thallium Zinc
µg/L µg/L µg/L µg/L µg/L mg/L µg/L mg/kg µg/L µg/L µg/L µg/L µg/L mg/L µg/L mg/L mg/L µg/L mg/kg
1*10 700 700 2 250 10 1 300 15 50 1 100 10 20 250 500 0.2*1
Analytical Method SPLP SPLP SPLP SPLP SPLP SPLP SPLP SPLP SPLP SPLP SPLP SPLP SPLP SPLP SPLP SPLP SPLP SPLP SPLP
Name and Depth Location Sample Collection Date
BC-18 (1-3')(East of Cell 1)10/[8-25]/13 <5 48.8 389.0 <200 1.2 3.06 30.8 0.0701 40,400 35.1 425 <0.2 30.7 0.9810 <10.0 4.79 N/A <1.0 0.0809BC-11/12 (44-46')Divider Dike Cell 2/3 10/[8-25]/13 <5 70.8 52.1 <200 <1.0 <1 <5.0 <0.0050 251 <5 <5 <0.2 <5 0.0665 27.7 4.04 N/A <0.2 <0.0500BC-15 (1-3')Cell 2 10/[8-25]/13 6 20.1 81.6 <200 <1.0 <1 <5.0 0.0074 660 <5 7 <0.2 <5 0.0530 <10.0 5.02 N/A <0.2 <0.0500BC-20D (1-3')North Portion of Cell 1 10/[8-25]/13 <25 <50.0 <250.0 <1000 <5.0 <1 <25.0 <0.0250 <250 <25 <25 <0.2 <25 0.1490 <50.0 5.12 N/A <1.0 <0.2500BC-30D (1-3')Cell 2 10/[8-25]/13 <25 51.8 350 <1000 <5.0 3.93 35.0 0.0655 6,780 <25 75 <0.2 30.9 0.1580 <50.0 4.48 N/A 1.1 <0.2500
Analytical Parameter
Units
15A NCAC 02L .0202(g) Groundwater Quality Standard
Tables - Page 3
Table 3 - SPLP Leaching Analytical Results
Notes:
1.TDS = Total dissolved solids
2.Units:
mg/L = milligrams per liter
µg/L = micrograms per liter
3.* IMAC (interim maximum allowable concentration)
4.Sample depth interval in parentheses
5.Standard is for hexavalent chromium (Cr VI). Results shown are for total chromium
6.Highlighted values indicate values that exceed the 15A NCAC 2L Standard
7.Analytical results with "<" preceding the result indicates that the parameter was not detected at a concentration which attains or exceeds the laboratory reporting limit
Tables - Page 4
Table 4 - Groundwater Analytical Results
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-N/A µg/L
NE NE NE NE 6.5 - 8.5 NE NE NE NE NE NE 4*
Analytical Method 2320B4d N/A N/A N/A N/A
Well Name Well Type Hydrostratigraphic Unit Sample Collection
Date Total Dissolved Total Dissolved Total Dissolved Total Total Dissolved Total
MW-10D Compliance Partially Weathered 3/8/2011 38.15 15.27 N/A 763 6.33 N/A 9.50 N/A N/A N/A N/A N/A <1 N/A <1 N/A 52 N/A N/A <50
MW-10D Compliance Partially Weathered 7/5/2011 38.37 17.71 N/A 738 5.98 N/A 1.70 N/A N/A N/A N/A N/A <1 N/A <1 N/A 50 N/A N/A <50
MW-10D Compliance Partially Weathered 11/2/2011 38.74 15.22 N/A 747 6.17 N/A 1.10 N/A N/A N/A N/A N/A <1 N/A <1 N/A 45 N/A N/A <50
MW-10D Compliance Partially Weathered 3/7/2012 38.19 15.92 1.67 753 6.12 380 1.54 N/A N/A N/A N/A N/A <1 N/A <1 N/A 42 N/A N/A <50
MW-10D Compliance Partially Weathered 7/3/2012 38.30 16.61 1.65 756 5.85 327 0.46 N/A N/A N/A N/A N/A <1 N/A <1 N/A 43 N/A N/A <50
MW-10D Compliance Partially Weathered 11/7/2012 38.35 15.38 1.87 741 5.81 453 1.43 <5 N/A N/A N/A N/A <1 N/A <1 N/A 46 N/A N/A <50
MW-10D Compliance Partially Weathered 3/6/2013 37.81 15.48 1.75 782 5.52 336 1.79 N/A N/A N/A N/A N/A <1 N/A <1 N/A 40 N/A N/A <50
MW-10D Compliance Partially Weathered 7/8/2013 37.44 16.03 1.93 793 5.74 328 0.79 N/A N/A N/A N/A <1 <1 <1 <1 39 40 N/A <50 <50
MW-10D Compliance Partially Weathered 11/5/2013 37.24 15.43 2.09 802 5.62 348 2.88 N/A N/A N/A N/A N/A <1 N/A <1 N/A 39 N/A N/A <50
MW-10D Compliance Partially Weathered 3/4/2014 36.93 15.16 2.08 805 5.53 381 5.96 N/A N/A N/A N/A N/A <1 N/A <1 N/A 47 N/A N/A <50
MW-10D Compliance Partially Weathered 7/1/2014 36.76 16.10 2.22 799 5.80 377 6.84 N/A N/A N/A N/A N/A <1 N/A <1 N/A 36 N/A N/A <50
MW-10D Compliance Partially Weathered 11/3/2014 37.64 15.38 2.25 812 5.84 464 2.60 N/A 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-11D Compliance Bedrock 3/7/2011 11.69 15.52 N/A 177 5.91 N/A 12.80 N/A N/A N/A N/A N/A <1 N/A <1 N/A 32 N/A N/A 1190
MW-11D Compliance Bedrock 7/5/2011 12.52 16.57 N/A 178 5.79 N/A 37.50 N/A N/A N/A N/A N/A <1 N/A <1 N/A 45 N/A N/A 1290
MW-11D Compliance Bedrock 11/2/2011 12.06 15.32 N/A 177 5.94 N/A 53.30 N/A N/A N/A N/A N/A <1 N/A <1 N/A 48 N/A N/A 1260
MW-11D Compliance Bedrock 3/7/2012 11.78 16.39 0.50 175 6.00 404 76.80 N/A N/A N/A N/A N/A <1 N/A <1 N/A 61 N/A N/A 1160
MW-11D Compliance Bedrock 7/3/2012 12.13 16.79 0.29 171 5.74 364 56.20 N/A N/A N/A N/A N/A <1 N/A <1 N/A 47 N/A N/A 1240
MW-11D Compliance Bedrock 11/7/2012 12.94 15.29 0.72 172 6.01 373 126.00 <5 N/A N/A N/A N/A <1 N/A <1 N/A 52 N/A N/A 1220
MW-11D Compliance Bedrock 3/7/2013 10.82 14.26 1.81 174 5.76 359 277.00 N/A N/A N/A N/A N/A <1 N/A <1 N/A 78 N/A N/A 1130
MW-11D Compliance Bedrock 7/9/2013 10.02 17.07 0.36 176 5.70 353 202.00 N/A N/A N/A N/A <1 <1 <1 <1 28 89 N/A 1260 1250
MW-11D Compliance Bedrock 11/5/2013 12.18 10.04 2.08 185 5.45 355 123.00 N/A N/A N/A N/A N/A <1 N/A <1 N/A 59 N/A N/A 1270
MW-11D Compliance Bedrock 3/4/2014 10.96 12.41 0.45 170 5.72 338 33.80 N/A N/A N/A N/A N/A <1 N/A <1 N/A 51 N/A N/A 1240
MW-11D Compliance Bedrock 7/1/2014 11.74 18.93 0.40 175 5.82 331 313.00 N/A N/A N/A N/A N/A <1 N/A 1.2 N/A 166 N/A N/A 1280
MW-11D Compliance Bedrock 11/3/2014 13.33 16.07 0.27 175 5.94 365 36.30 N/A 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-11S Compliance Transition (Saprolite)3/7/2011 12.07 13.97 N/A 193 6.22 N/A 22.90 N/A N/A N/A N/A N/A <1 N/A <1 N/A 13 N/A N/A 440
MW-11S Compliance Transition (Saprolite)7/5/2011 12.92 16.33 N/A 189 6.03 N/A 14.30 N/A N/A N/A N/A N/A <1 N/A <1 N/A 8 N/A N/A 472
MW-11S Compliance Transition (Saprolite)11/2/2011 12.41 15.80 N/A 190 6.16 N/A 7.20 N/A N/A N/A N/A N/A <1 N/A <1 N/A 8 N/A N/A 481
MW-11S Compliance Transition (Saprolite)3/7/2012 12.13 15.42 0.59 192 6.16 405 2.59 N/A N/A N/A N/A N/A <1 N/A <1 N/A 7 N/A N/A 438
MW-11S Compliance Transition (Saprolite)7/3/2012 12.54 16.21 0.37 180 5.97 324 4.89 N/A N/A N/A N/A N/A <1 N/A <1 N/A 9 N/A N/A 442
MW-11S Compliance Transition (Saprolite)11/7/2012 13.35 16.10 0.42 184 6.27 351 3.09 <5 N/A N/A N/A N/A <1 N/A <1 N/A 7 N/A N/A 453
MW-11S Compliance Transition (Saprolite)3/7/2013 11.20 13.98 0.78 185 5.86 345 4.83 N/A N/A N/A N/A N/A <1 N/A <1 N/A 7 N/A N/A 416
MW-11S Compliance Transition (Saprolite)7/9/2013 10.51 16.29 0.60 192 5.87 338 6.05 N/A N/A N/A N/A <1 <1 <1 <1 7 8 N/A 449 453
MW-11S Compliance Transition (Saprolite)11/5/2013 12.56 16.35 0.43 200 5.83 328 7.76 N/A N/A N/A N/A N/A <1 N/A <1 N/A 8 N/A N/A 446
MW-11S Compliance Transition (Saprolite)3/4/2014 11.30 14.24 0.41 204 5.85 317 16.20 N/A N/A N/A N/A N/A <1 N/A <1 N/A 13 N/A N/A 440
MW-11S Compliance Transition (Saprolite)7/1/2014 12.13 16.48 0.45 208 5.96 310 4.90 N/A N/A N/A N/A N/A <1 N/A <1 N/A 7 N/A N/A 446
MW-11S Compliance Transition (Saprolite)11/3/2014 13.63 16.85 0.46 218 6.19 337 9.77 N/A 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-12D Compliance Bedrock 3/8/2011 6.51 15.03 N/A 73 6.23 N/A 431.00 N/A N/A N/A N/A N/A <1 N/A <1 N/A 74 N/A N/A <50
MW-12D Compliance Bedrock 7/5/2011 7.68 16.20 N/A 67 6.17 N/A 63.20 N/A N/A N/A N/A N/A <1 N/A <1 N/A 55 N/A N/A <50
MW-12D Compliance Bedrock 11/2/2011 8.02 15.29 N/A 69 6.32 N/A 68.60 N/A N/A N/A N/A N/A <1 N/A <1 N/A 46 N/A N/A <50
MW-12D Compliance Bedrock 3/7/2012 6.11 15.47 6.84 67 6.25 401 23.60 N/A N/A N/A N/A N/A <1 N/A <1 N/A 28 N/A N/A <50
MW-12D Compliance Bedrock 7/3/2012 7.19 15.71 6.69 64 6.06 362 9.34 N/A N/A N/A N/A N/A <1 N/A <1 N/A 20 N/A N/A <50
MW-12D Compliance Bedrock 11/7/2012 8.10 15.47 6.72 66 6.35 361 6.14 <5 N/A N/A N/A N/A <1 N/A <1 N/A 19 N/A N/A <50
MW-12D Compliance Bedrock 3/7/2013 6.75 15.39 6.70 67 5.89 338 5.87 N/A N/A N/A N/A N/A <1 N/A <1 N/A 14 N/A N/A <50
MW-12D Compliance Bedrock 7/9/2013 6.57 15.75 6.67 66 6.01 389 4.52 N/A N/A N/A N/A <1 <1 <1 <1 11 26 N/A <50 <50
MW-12D Compliance Bedrock 11/4/2013 7.02 15.61 6.51 66 6.15 333 3.89 N/A N/A N/A N/A N/A <1 N/A <1 N/A 16 N/A N/A <50
MW-12D Compliance Bedrock 3/4/2014 5.45 15.04 6.70 66 6.02 350 7.40 N/A N/A N/A N/A N/A <1 N/A <1 N/A 31 N/A N/A <50
MW-12D Compliance Bedrock 7/1/2014 6.09 15.59 6.77 66 6.07 349 5.23 N/A N/A N/A N/A N/A <1 N/A <1 N/A 16 N/A N/A <50
Total
Analytical Parameter Antimony Arsenic Barium
15A NCAC 02L .0202(g) Groundwater Quality Standard 1*10 700
Field Measurements
Boron
Units µg/L µg/L µg/L µg/L
700
200.8 200.8 200.7 200.7
Alkalinity
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-N/A µg/L
NE NE NE NE 6.5 - 8.5 NE NE NE NE NE NE 4*
Analytical Method 2320B4d N/A N/A N/A N/A
Well Name Well Type Hydrostratigraphic Unit Sample Collection
Date Total Dissolved Total Dissolved Total Dissolved Total Total Dissolved TotalTotal
Analytical Parameter Antimony Arsenic Barium
15A NCAC 02L .0202(g) Groundwater Quality Standard 1*10 700
Field Measurements
Boron
Units µg/L µg/L µg/L µg/L
700
200.8 200.8 200.7 200.7
Alkalinity
MW-12D Compliance Bedrock 11/3/2014 7.69 15.43 6.71 66 6.23 363 3.87 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
MW-12S Compliance Transition (Saprolite)3/8/2011 6.58 13.80 N/A 116 6.12 N/A 13.40 N/A N/A N/A N/A N/A <1 N/A <1 N/A 25 N/A N/A <50
MW-12S Compliance Transition (Saprolite)7/5/2011 7.79 15.81 N/A 92 6.02 N/A 9.00 N/A N/A N/A N/A N/A <1 N/A <1 N/A 21 N/A N/A <50
MW-12S Compliance Transition (Saprolite)11/2/2011 8.15 15.99 N/A 95 6.30 N/A 9.50 N/A N/A N/A N/A N/A <1 N/A <1 N/A 19 N/A N/A <50
MW-12S Compliance Transition (Saprolite)3/7/2012 6.15 14.80 4.18 86 6.21 397 8.01 N/A N/A N/A N/A N/A <1 N/A <1 N/A 17 N/A N/A <50
MW-12S Compliance Transition (Saprolite)7/3/2012 7.29 16.22 4.55 75 5.97 367 2.50 N/A N/A N/A N/A N/A <1 N/A <1 N/A 17 N/A N/A <50
MW-12S Compliance Transition (Saprolite)11/7/2012 8.22 16.25 3.97 78 6.24 335 2.56 <5 N/A N/A N/A N/A <1 N/A <1 N/A 17 N/A N/A <50
MW-12S Compliance Transition (Saprolite)3/7/2013 6.83 12.26 3.58 91 5.85 351 8.14 N/A N/A N/A N/A N/A <1 N/A <1 N/A 17 N/A N/A <50
MW-12S Compliance Transition (Saprolite)7/9/2013 6.64 16.30 3.53 79 5.85 362 7.76 N/A N/A N/A N/A <1 <1 <1 <1 16 18 N/A <50 <50
MW-12S Compliance Transition (Saprolite)11/4/2013 7.11 16.36 3.28 80 5.96 327 13.20 N/A N/A N/A N/A N/A <1 N/A <1 N/A 19 N/A N/A <50
MW-12S Compliance Transition (Saprolite)3/4/2014 5.50 12.04 5.14 73 5.86 351 7.11 N/A N/A N/A N/A N/A <1 N/A <1 N/A 16 N/A N/A <50
MW-12S Compliance Transition (Saprolite)7/1/2014 6.14 15.13 5.38 71 5.94 346 9.75 N/A N/A N/A N/A N/A <1 N/A <1 N/A 16 N/A N/A <50
MW-12S Compliance Transition (Saprolite)11/3/2014 7.72 16.07 4.98 72 6.12 353 13.80 N/A 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-13D Compliance Bedrock 3/8/2011 12.90 14.58 N/A 154 6.21 N/A 12.90 N/A N/A N/A N/A N/A <1 N/A <1 N/A 44 N/A N/A <50
MW-13D Compliance Bedrock 7/5/2011 14.08 16.23 N/A 156 6.23 N/A 17.70 N/A N/A N/A N/A N/A <1 N/A <1 N/A 48 N/A N/A <50
MW-13D Compliance Bedrock 11/2/2011 15.29 15.17 N/A 146 6.35 N/A 7.30 N/A N/A N/A N/A N/A <1 N/A <1 N/A 42 N/A N/A <50
MW-13D Compliance Bedrock 3/7/2012 12.70 15.63 4.44 140 6.38 411 9.90 N/A N/A N/A N/A N/A <1 N/A <1 N/A 41 N/A N/A <50
MW-13D Compliance Bedrock 7/3/2012 13.53 15.45 3.79 148 6.15 425 1.63 N/A N/A N/A N/A N/A <1 N/A <1 N/A 45 N/A N/A <50
MW-13D Compliance Bedrock 11/7/2012 15.00 15.24 3.84 143 6.33 360 1.37 <5 N/A N/A N/A N/A <1 N/A <1 N/A 43 N/A N/A <50
MW-13D Compliance Bedrock 3/6/2013 13.45 14.09 5.00 138 6.14 349 9.80 N/A N/A N/A N/A N/A <1 N/A <1 N/A 40 N/A N/A <50
MW-13D Compliance Bedrock 7/8/2013 12.68 16.67 4.05 147 6.20 301 9.47 N/A N/A N/A N/A <1 <1 <1 <1 43 46 N/A <50 <50
MW-13D Compliance Bedrock 11/4/2013 14.16 14.70 4.98 152 6.25 316 4.90 N/A N/A N/A N/A N/A <1 N/A <1 N/A 45 N/A N/A <50
MW-13D Compliance Bedrock 3/3/2014 12.08 11.36 4.84 141 6.15 343 27.20 N/A N/A N/A N/A N/A <1 N/A <1 N/A 48 N/A N/A <50
MW-13D Compliance Bedrock 7/1/2014 11.38 15.03 3.75 160 6.17 330 9.17 N/A N/A N/A N/A N/A <1 N/A <1 N/A 50 N/A N/A <50
MW-13D Compliance Bedrock 11/3/2014 14.41 14.85 3.95 161 6.30 371 4.10 N/A 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-1D Voluntary Bedrock 11/15/2006 N/A 15.39 N/A 406 7.27 N/A 17.80 N/A N/A N/A N/A N/A N/A N/A <2 N/A 31 N/A N/A 280
MW-1D Voluntary Bedrock 5/15/2007 N/A 18.49 N/A 415 6.83 N/A 1.93 N/A N/A N/A N/A N/A N/A N/A <2 N/A 36 N/A N/A 373
MW-1D Voluntary Bedrock 11/19/2007 N/A 17.49 N/A 418 6.81 N/A 3.75 N/A N/A N/A N/A N/A N/A N/A <2 N/A 27 N/A N/A 466
MW-1D Voluntary Bedrock 5/21/2008 N/A 16.21 N/A 415 6.88 N/A 1.61 N/A N/A N/A N/A N/A N/A N/A <2 N/A 27 N/A N/A 506
MW-1D Voluntary Bedrock 11/24/2008 N/A 15.10 N/A 415 6.95 N/A 1.80 N/A N/A N/A N/A N/A N/A N/A <2 N/A 23 N/A N/A 593
MW-1D Voluntary Bedrock 5/12/2009 N/A 16.90 N/A 405 6.93 N/A 0.89 N/A N/A N/A N/A N/A N/A N/A <1 N/A 25 N/A N/A 388
MW-1D Voluntary Bedrock 11/2/2009 N/A 16.04 N/A 399 6.68 N/A 2.98 N/A N/A N/A N/A N/A N/A N/A <1 N/A 22.8 N/A N/A 442
MW-1D Voluntary Bedrock 5/25/2010 1.80 16.49 N/A 388 6.83 N/A 1.66 N/A N/A N/A N/A N/A N/A N/A <1 N/A 18.3 N/A N/A 304
MW-1D Voluntary Bedrock 11/4/2013 4.03 N/A N/A N/A N/A N/A N/A N/A 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 Transition (Saprolite)11/15/2006 N/A 16.95 N/A 409 7.30 N/A 95.80 N/A N/A N/A N/A N/A N/A N/A <2 N/A 67 N/A N/A 302
MW-1S Voluntary Transition (Saprolite)5/15/2007 N/A 16.00 N/A 400 6.77 N/A 326.00 N/A N/A N/A N/A N/A N/A N/A <2 N/A 69 N/A N/A 322
MW-1S Voluntary Transition (Saprolite)11/19/2007 N/A 17.66 N/A 418 6.87 N/A 146.00 N/A N/A N/A N/A N/A N/A N/A <2 N/A 50 N/A N/A 428
MW-1S Voluntary Transition (Saprolite)5/21/2008 N/A 15.60 N/A 402 6.81 N/A 236.00 N/A N/A N/A N/A N/A N/A N/A <2 N/A 59 N/A N/A 465
MW-1S Voluntary Transition (Saprolite)11/24/2008 N/A 15.60 N/A 406 6.92 N/A 104.00 N/A N/A N/A N/A N/A N/A N/A <2 N/A 48 N/A N/A 516
MW-1S Voluntary Transition (Saprolite)11/25/2008 N/A N/A N/A N/A N/A N/A N/A N/A 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 Transition (Saprolite)5/12/2009 N/A 17.05 N/A 355 6.88 N/A 50.50 N/A N/A N/A N/A N/A N/A N/A <1 N/A 41 N/A N/A 279
MW-1S Voluntary Transition (Saprolite)11/2/2009 N/A 17.70 N/A 367 6.70 N/A 45.40 N/A N/A N/A N/A N/A N/A N/A <1 N/A 35 N/A N/A 254
MW-1S Voluntary Transition (Saprolite)5/25/2010 2.29 17.10 N/A 355 6.88 N/A 100.00 N/A N/A N/A N/A N/A N/A N/A <1 N/A 38.1 N/A N/A 97.6
MW-1S Voluntary Transition (Saprolite)3/8/2011 3.00 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
MW-1S Voluntary Transition (Saprolite)7/5/2011 3.62 N/A N/A N/A N/A N/A N/A N/A 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 Transition (Saprolite)11/2/2011 3.22 N/A N/A N/A N/A N/A N/A N/A 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 Transition (Saprolite)11/4/2013 4.42 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Tables - Page 6
Table 4 - Groundwater Analytical Results
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-N/A µg/L
NE NE NE NE 6.5 - 8.5 NE NE NE NE NE NE 4*
Analytical Method 2320B4d N/A N/A N/A N/A
Well Name Well Type Hydrostratigraphic Unit Sample Collection
Date Total Dissolved Total Dissolved Total Dissolved Total Total Dissolved TotalTotal
Analytical Parameter Antimony Arsenic Barium
15A NCAC 02L .0202(g) Groundwater Quality Standard 1*10 700
Field Measurements
Boron
Units µg/L µg/L µg/L µg/L
700
200.8 200.8 200.7 200.7
Alkalinity
MW-2D Voluntary Bedrock 11/15/2006 N/A 14.89 N/A 199 6.60 N/A 887.00 N/A N/A N/A N/A N/A N/A N/A <2 N/A 200 N/A N/A <100
MW-2D Voluntary Bedrock 5/16/2007 N/A 15.85 N/A 188 6.12 N/A 105.00 N/A N/A N/A N/A N/A N/A N/A <2 N/A 89 N/A N/A <100
MW-2D Voluntary Bedrock 11/19/2007 N/A 14.99 N/A 227 6.21 N/A 4.23 N/A N/A N/A N/A N/A N/A N/A <2 N/A 80 N/A N/A <60
MW-2D Voluntary Bedrock 5/21/2008 N/A 15.41 N/A 219 6.22 N/A 3.92 N/A N/A N/A N/A N/A N/A N/A <2 N/A 76 N/A N/A <100
MW-2S Voluntary Transition (Saprolite)11/15/2006 N/A 15.00 N/A 250 6.02 N/A 3.83 N/A N/A N/A N/A N/A N/A N/A <2 N/A 134 N/A N/A 440
MW-2S Voluntary Transition (Saprolite)5/16/2007 N/A 15.60 N/A 254 5.47 N/A 7.44 N/A N/A N/A N/A N/A N/A N/A <2 N/A 128 N/A N/A 463
MW-2S Voluntary Transition (Saprolite)11/19/2007 N/A 14.65 N/A 263 5.88 N/A 22.20 N/A N/A N/A N/A N/A N/A N/A <2 N/A 127 N/A N/A 449
MW-2S Voluntary Transition (Saprolite)5/21/2008 N/A 15.60 N/A 248 5.62 N/A 6.23 N/A N/A N/A N/A N/A N/A N/A <2 N/A 125 N/A N/A 487
MW-3D Voluntary Bedrock 11/15/2006 N/A 15.45 N/A 377 6.14 N/A 12.70 N/A N/A N/A N/A N/A N/A N/A <2 N/A 109 N/A N/A 934
MW-3D Voluntary Bedrock 5/15/2007 N/A 16.11 N/A 368 6.12 N/A 2.49 N/A N/A N/A N/A N/A N/A N/A <2 N/A 97 N/A N/A 919
MW-3D Voluntary Bedrock 11/19/2007 N/A 15.82 N/A 367 5.99 N/A 1.82 N/A N/A N/A N/A N/A N/A N/A <2 N/A 98 N/A N/A 866
MW-3D Voluntary Bedrock 5/21/2008 N/A 16.21 N/A 358 6.12 N/A 4.13 N/A N/A N/A N/A N/A N/A N/A <2 N/A 98 N/A N/A 881
MW-3D Voluntary Bedrock 11/24/2008 N/A 15.07 N/A 343 6.28 N/A 1.16 N/A N/A N/A N/A N/A N/A N/A <2 N/A 88 N/A N/A 805
MW-3D Voluntary Bedrock 5/12/2009 N/A 16.62 N/A 339 6.27 N/A 1.51 N/A N/A N/A N/A N/A N/A N/A <1 N/A 91 N/A N/A 780
MW-3D Voluntary Bedrock 11/2/2009 N/A 16.40 N/A 334 6.15 N/A 2.68 N/A N/A N/A N/A N/A N/A N/A <1 N/A 83 N/A N/A 817
MW-3D Voluntary Bedrock 5/25/2010 2.91 16.88 N/A 324 6.10 N/A 1.05 N/A N/A N/A N/A N/A N/A N/A <1 N/A 80.7 N/A N/A 732
MW-3D Voluntary Bedrock 11/4/2013 4.73 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 N/A N/A
MW-3S Voluntary Transition (Saprolite)11/15/2006 N/A 16.34 N/A 223 5.49 N/A 13.90 N/A N/A N/A N/A N/A N/A N/A <2 N/A 35 N/A N/A 1309
MW-3S Voluntary Transition (Saprolite)5/15/2007 N/A 14.63 N/A 230 5.40 N/A 6.59 N/A N/A N/A N/A N/A N/A N/A <2 N/A 30 N/A N/A 1208
MW-3S Voluntary Transition (Saprolite)11/19/2007 N/A 17.04 N/A 222 5.37 N/A 7.70 N/A N/A N/A N/A N/A N/A N/A <2 N/A 31 N/A N/A 1260
MW-3S Voluntary Transition (Saprolite)5/21/2008 N/A 15.03 N/A 215 5.45 N/A 21.40 N/A N/A N/A N/A N/A N/A N/A <2 N/A 27 N/A N/A 1210
MW-3S Voluntary Transition (Saprolite)11/24/2008 N/A 15.92 N/A 199 5.66 N/A 24.00 N/A N/A N/A N/A N/A N/A N/A <2 N/A 30 N/A N/A 1180
MW-3S Voluntary Transition (Saprolite)5/12/2009 N/A 15.27 N/A 199 5.63 N/A 20.60 N/A N/A N/A N/A N/A N/A N/A <1 N/A 28 N/A N/A 1130
MW-3S Voluntary Transition (Saprolite)11/2/2009 N/A 17.86 N/A 198 5.54 N/A 7.54 N/A N/A N/A N/A N/A N/A N/A <1 N/A 22.7 N/A N/A 1260
MW-3S Voluntary Transition (Saprolite)5/25/2010 2.50 16.05 N/A 197 5.50 N/A 8.59 N/A N/A N/A N/A N/A N/A N/A <1 N/A 22.9 N/A N/A 1110
MW-3S Voluntary Transition (Saprolite)3/7/2011 3.46 N/A N/A N/A N/A N/A N/A N/A 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 Transition (Saprolite)7/5/2011 4.55 N/A N/A N/A N/A N/A N/A N/A 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 Transition (Saprolite)11/2/2011 4.05 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 N/A N/A
MW-3S Voluntary Transition (Saprolite)11/4/2013 4.08 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 N/A N/A
MW-4D Voluntary Bedrock 11/14/2006 N/A 16.64 N/A 200 6.15 N/A 10.90 N/A N/A N/A N/A N/A N/A N/A <2 N/A 20 N/A N/A 434
MW-4D Voluntary Bedrock 5/15/2007 N/A 16.97 N/A 196 6.03 N/A 0.52 N/A N/A N/A N/A N/A N/A N/A <2 N/A 15 N/A N/A 455
MW-4D Voluntary Bedrock 11/19/2007 N/A 17.04 N/A 194 5.93 N/A 1.16 N/A N/A N/A N/A N/A N/A N/A <2 N/A 18 N/A N/A 461
MW-4D Voluntary Bedrock 5/21/2008 N/A 15.96 N/A 199 5.93 N/A 6.22 N/A N/A N/A N/A N/A N/A N/A <2 N/A 18 N/A N/A 489
MW-4D Voluntary Bedrock 11/24/2008 N/A 15.21 N/A 188 6.14 N/A 1.08 N/A N/A N/A N/A N/A N/A N/A <2 N/A 17 N/A N/A 478
MW-4D Voluntary Bedrock 5/12/2009 N/A 15.70 N/A 196 6.09 N/A 2.18 N/A N/A N/A N/A N/A N/A N/A <1 N/A 19 N/A N/A 502
MW-4D Voluntary Bedrock 11/2/2009 N/A 16.15 N/A 194 6.06 N/A 2.78 N/A N/A N/A N/A N/A N/A N/A <1 N/A 16.3 N/A N/A 533
MW-4D Voluntary Bedrock 5/25/2010 10.91 16.36 N/A 195 6.00 N/A 0.81 N/A N/A N/A N/A N/A N/A N/A <1 N/A 17.1 N/A N/A 528
MW-4D Voluntary Bedrock 11/4/2013 11.73 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 N/A N/A
MW-4S Voluntary Transition (Saprolite)11/14/2006 N/A 17.56 N/A 190 6.27 N/A 16.40 N/A N/A N/A N/A N/A N/A N/A <2 N/A 32 N/A N/A 483
MW-4S Voluntary Transition (Saprolite)5/15/2007 N/A 16.94 N/A 182 6.16 N/A 39.80 N/A N/A N/A N/A N/A N/A N/A <2 N/A 30 N/A N/A 487
MW-4S Voluntary Transition (Saprolite)11/19/2007 N/A 18.02 N/A 184 6.09 N/A 18.40 N/A N/A N/A N/A N/A N/A N/A <2 N/A 35 N/A N/A 466
MW-4S Voluntary Transition (Saprolite)5/21/2008 N/A 15.48 N/A 187 6.10 N/A 140.00 N/A N/A N/A N/A N/A N/A N/A <2 N/A 73 N/A N/A 481
MW-4S Voluntary Transition (Saprolite)11/24/2008 N/A 15.27 N/A 181 6.22 N/A 9.76 N/A N/A N/A N/A N/A N/A N/A <2 N/A 32 N/A N/A 456
MW-4S Voluntary Transition (Saprolite)5/12/2009 N/A 15.11 N/A 184 6.23 N/A 158.00 N/A N/A N/A N/A N/A N/A N/A <1 N/A 100 N/A N/A 494
MW-4S Voluntary Transition (Saprolite)11/2/2009 N/A 16.94 N/A 190 6.15 N/A 74.30 N/A N/A N/A N/A N/A N/A N/A <1 N/A 43.8 N/A N/A 505
MW-4S Voluntary Transition (Saprolite)5/25/2010 7.72 15.93 N/A 189 6.09 N/A 14.70 N/A N/A N/A N/A N/A N/A N/A <1 N/A 37.9 N/A N/A 499
MW-4S Voluntary Transition (Saprolite)3/7/2011 8.02 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Tables - Page 7
Table 4 - Groundwater Analytical Results
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-N/A µg/L
NE NE NE NE 6.5 - 8.5 NE NE NE NE NE NE 4*
Analytical Method 2320B4d N/A N/A N/A N/A
Well Name Well Type Hydrostratigraphic Unit Sample Collection
Date Total Dissolved Total Dissolved Total Dissolved Total Total Dissolved TotalTotal
Analytical Parameter Antimony Arsenic Barium
15A NCAC 02L .0202(g) Groundwater Quality Standard 1*10 700
Field Measurements
Boron
Units µg/L µg/L µg/L µg/L
700
200.8 200.8 200.7 200.7
Alkalinity
MW-4S Voluntary Transition (Saprolite)7/5/2011 8.56 N/A N/A N/A N/A N/A N/A N/A 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 Transition (Saprolite)11/2/2011 8.01 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 N/A N/A N/A N/A N/A N/A
MW-4S Voluntary Transition (Saprolite)11/4/2013 8.21 N/A N/A N/A N/A N/A N/A N/A 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-5D Voluntary Bedrock 11/15/2006 N/A 15.98 N/A 196 6.04 N/A 7.75 N/A N/A N/A N/A N/A N/A N/A <2 N/A 24 N/A N/A 388
MW-5D Voluntary Bedrock 5/16/2007 N/A 16.36 N/A 193 6.12 N/A 0.64 N/A N/A N/A N/A N/A N/A N/A <2 N/A 19 N/A N/A 384
MW-5D Voluntary Bedrock 11/20/2007 N/A 15.59 N/A 190 6.13 N/A 1.24 N/A N/A N/A N/A N/A N/A N/A <2 N/A 22 N/A N/A 363
MW-5D Voluntary Bedrock 5/21/2008 N/A 16.92 N/A 189 6.02 N/A 5.54 N/A N/A N/A N/A N/A N/A N/A <2 N/A 20 N/A N/A 372
MW-5D Voluntary Bedrock 11/24/2008 N/A 15.86 N/A 180 6.13 N/A 0.69 N/A N/A N/A N/A N/A N/A N/A <2 N/A 20 N/A N/A 340
MW-5D Voluntary Bedrock 5/12/2009 N/A 16.11 N/A 191 6.08 N/A 1.97 N/A N/A N/A N/A N/A N/A N/A <1 N/A 22 N/A N/A 349
MW-5D Voluntary Bedrock 11/2/2009 N/A 16.32 N/A 191 6.00 N/A 3.44 N/A N/A N/A N/A N/A N/A N/A <1 N/A 20.1 N/A N/A 369
MW-5D Voluntary Bedrock 5/25/2010 18.56 17.13 N/A 195 5.96 N/A 1.56 N/A N/A N/A N/A N/A N/A N/A <1 N/A 20.8 N/A N/A 342
MW-5D Voluntary Bedrock 11/4/2013 20.87 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 N/A N/A
MW-5S Voluntary Transition (Saprolite)11/15/2006 N/A 15.88 N/A 149 5.80 N/A 16.40 N/A N/A N/A N/A N/A N/A N/A <2 N/A 34 N/A N/A 230
MW-5S Voluntary Transition (Saprolite)5/16/2007 N/A 16.13 N/A 144 5.84 N/A 7.99 N/A N/A N/A N/A N/A N/A N/A <2 N/A 28 N/A N/A 259
MW-5S Voluntary Transition (Saprolite)11/20/2007 N/A 15.44 N/A 157 5.81 N/A 18.10 N/A N/A N/A N/A N/A N/A N/A <2 N/A 49 N/A N/A 242
MW-5S Voluntary Transition (Saprolite)5/21/2008 N/A 16.97 N/A 158 5.77 N/A 10.90 N/A N/A N/A N/A N/A N/A N/A <2 N/A 37 N/A N/A 243
MW-5S Voluntary Transition (Saprolite)11/24/2008 N/A 15.82 N/A 157 5.90 N/A 4.18 N/A N/A N/A N/A N/A N/A N/A <2 N/A 37 N/A N/A 213
MW-5S Voluntary Transition (Saprolite)5/12/2009 N/A 15.93 N/A 160 5.88 N/A 8.24 N/A N/A N/A N/A N/A N/A N/A <1 N/A 37 N/A N/A 202
MW-5S Voluntary Transition (Saprolite)11/2/2009 N/A 16.35 N/A 157 5.82 N/A 19.00 N/A N/A N/A N/A N/A N/A N/A <1 N/A 39.9 N/A N/A 210
MW-5S Voluntary Transition (Saprolite)5/25/2010 18.53 16.90 N/A 153 5.75 N/A 7.80 N/A N/A N/A N/A N/A N/A N/A <1 N/A 32 N/A N/A 222
MW-5S Voluntary Transition (Saprolite)3/8/2011 20.79 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 N/A N/A N/A N/A N/A N/A
MW-5S Voluntary Transition (Saprolite)7/5/2011 21.62 N/A N/A N/A N/A N/A N/A N/A 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 Transition (Saprolite)11/2/2011 20.53 N/A N/A N/A N/A N/A N/A N/A 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 Transition (Saprolite)11/4/2013 20.84 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 N/A N/A
MW-6D Compliance Bedrock 11/14/2006 N/A 15.86 N/A 73 7.05 N/A 24.50 N/A N/A N/A N/A N/A N/A N/A <2 N/A 40 N/A N/A <100
MW-6D Compliance Bedrock 5/15/2007 N/A 16.32 N/A 74 6.94 N/A 8.15 N/A N/A N/A N/A N/A N/A N/A <2 N/A 36 N/A N/A <100
MW-6D Compliance Bedrock 11/20/2007 N/A 14.27 N/A 83 6.98 N/A 1.39 N/A N/A N/A N/A N/A N/A N/A <2 N/A 44 N/A N/A <60
MW-6D Compliance Bedrock 5/21/2008 N/A 16.14 N/A 90 6.90 N/A 1.08 N/A N/A N/A N/A N/A N/A N/A <2 N/A 45 N/A N/A <100
MW-6D Compliance Bedrock 11/24/2008 N/A 14.05 N/A 94 6.80 N/A 0.63 N/A N/A N/A N/A N/A N/A N/A <2 N/A 51 N/A N/A <100
MW-6D Compliance Bedrock 5/12/2009 N/A 15.15 N/A 112 6.84 N/A 0.32 N/A N/A N/A N/A N/A N/A N/A <1 N/A 60 N/A N/A <100
MW-6D Compliance Bedrock 11/2/2009 N/A 15.01 N/A 112 6.67 N/A 2.58 N/A N/A N/A N/A N/A N/A N/A <1 N/A 57 N/A N/A <50
MW-6D Compliance Bedrock 5/25/2010 18.21 15.93 N/A 125 6.73 N/A 0.67 N/A N/A N/A N/A N/A N/A N/A <1 N/A 60.7 N/A N/A <50
MW-6D Compliance Bedrock 3/7/2011 19.90 15.21 N/A 123 6.98 N/A 2.00 N/A N/A N/A N/A N/A <1 N/A <1 N/A 63 N/A N/A <50
MW-6D Compliance Bedrock 7/5/2011 20.20 16.48 N/A 127 6.63 N/A 0.90 N/A N/A N/A N/A N/A <1 N/A <1 N/A 64 N/A N/A <50
MW-6D Compliance Bedrock 11/2/2011 20.88 14.32 N/A 125 6.83 N/A 0.50 N/A N/A N/A N/A N/A <1 N/A <1 N/A 62 N/A N/A <50
MW-6D Compliance Bedrock 3/7/2012 19.06 15.32 2.45 133 6.80 365 0.94 N/A N/A N/A N/A N/A <1 N/A <1 N/A 65 N/A N/A <50
MW-6D Compliance Bedrock 7/3/2012 19.88 15.99 2.39 133 5.83 334 0.50 N/A N/A N/A N/A N/A <1 N/A <1 N/A 70 N/A N/A <50
MW-6D Compliance Bedrock 11/7/2012 20.77 14.99 2.29 133 6.69 393 0.54 <5 N/A N/A N/A N/A <1 N/A <1 N/A 70 N/A N/A <50
MW-6D Compliance Bedrock 3/6/2013 19.31 14.50 2.36 138 6.58 315 2.86 N/A N/A N/A N/A N/A <1 N/A <1 N/A 73 N/A N/A <50
MW-6D Compliance Bedrock 7/8/2013 18.91 16.32 2.40 144 6.55 230 1.98 N/A N/A N/A N/A <1 <1 <1 <1 81 84 N/A <50 <50
MW-6D Compliance Bedrock 11/4/2013 22.31 14.85 1.95 146 6.60 291 2.82 N/A N/A N/A N/A N/A <1 N/A <1 N/A 81 N/A N/A <50
MW-6D Compliance Bedrock 3/3/2014 20.63 14.97 2.12 144 6.58 273 1.35 N/A N/A N/A N/A N/A <1 N/A <1 N/A 83 N/A N/A <50
MW-6D Compliance Bedrock 7/1/2014 21.78 16.43 1.91 150 6.69 449 2.35 N/A N/A N/A N/A N/A <1 N/A <1 N/A 86 N/A N/A <50
MW-6D Compliance Bedrock 11/3/2014 24.04 15.16 2.11 145 6.67 479 1.24 N/A 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 Compliance Transition (Saprolite)11/14/2006 N/A 15.37 N/A 43 5.76 N/A 71.80 N/A N/A N/A N/A N/A N/A N/A <2 N/A 47 N/A N/A <100
MW-6S Compliance Transition (Saprolite)5/15/2007 N/A 14.69 N/A 39 5.28 N/A 4.79 N/A N/A N/A N/A N/A N/A N/A <2 N/A 23 N/A N/A <100
MW-6S Compliance Transition (Saprolite)11/20/2007 N/A 14.13 N/A 42 5.48 N/A 37.80 N/A N/A N/A N/A N/A N/A N/A <2 N/A 39 N/A N/A <60
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-N/A µg/L
NE NE NE NE 6.5 - 8.5 NE NE NE NE NE NE 4*
Analytical Method 2320B4d N/A N/A N/A N/A
Well Name Well Type Hydrostratigraphic Unit Sample Collection
Date Total Dissolved Total Dissolved Total Dissolved Total Total Dissolved TotalTotal
Analytical Parameter Antimony Arsenic Barium
15A NCAC 02L .0202(g) Groundwater Quality Standard 1*10 700
Field Measurements
Boron
Units µg/L µg/L µg/L µg/L
700
200.8 200.8 200.7 200.7
Alkalinity
MW-6S Compliance Transition (Saprolite)5/21/2008 N/A 15.88 N/A 43 5.42 N/A 64.90 N/A N/A N/A N/A N/A N/A N/A <2 N/A 43 N/A N/A <100
MW-6S Compliance Transition (Saprolite)11/24/2008 N/A 13.56 N/A 36 5.29 N/A 78.00 N/A N/A N/A N/A N/A N/A N/A <2 N/A 40 N/A N/A <100
MW-6S Compliance Transition (Saprolite)5/12/2009 N/A 14.48 N/A 42 5.40 N/A 59.60 N/A N/A N/A N/A N/A N/A N/A <1 N/A 39 N/A N/A <100
MW-6S Compliance Transition (Saprolite)11/2/2009 N/A 14.64 N/A 40 5.32 N/A 14.50 N/A N/A N/A N/A N/A N/A N/A <1 N/A 32.9 N/A N/A <50
MW-6S Compliance Transition (Saprolite)5/25/2010 17.62 15.60 N/A 51 5.30 N/A 11.90 N/A N/A N/A N/A N/A N/A N/A <1 N/A 32.9 N/A N/A <50
MW-6S Compliance Transition (Saprolite)3/7/2011 20.44 15.60 N/A 43 5.54 N/A 8.10 N/A N/A N/A N/A N/A <1 N/A <1 N/A 36 N/A N/A <50
MW-6S Compliance Transition (Saprolite)7/5/2011 21.26 15.87 N/A 48 5.09 N/A 7.50 N/A N/A N/A N/A N/A <1 N/A <1 N/A 40 N/A N/A <50
MW-6S Compliance Transition (Saprolite)11/2/2011 21.92 14.46 N/A 46 5.41 N/A 4.00 N/A N/A N/A N/A N/A <1 N/A <1 N/A 36 N/A N/A <50
MW-6S Compliance Transition (Saprolite)3/7/2012 18.86 15.65 0.43 53 5.26 408 1.63 N/A N/A N/A N/A N/A <1 N/A <1 N/A 39 N/A N/A <50
MW-6S Compliance Transition (Saprolite)7/3/2012 20.55 16.27 0.43 52 4.48 362 5.21 N/A N/A N/A N/A N/A <1 N/A <1 N/A 39 N/A N/A <50
MW-6S Compliance Transition (Saprolite)11/7/2012 21.87 14.58 0.12 48 5.24 432 4.26 <5 N/A N/A N/A N/A <1 N/A <1 N/A 40 N/A N/A <50
MW-6S Compliance Transition (Saprolite)3/6/2013 19.45 15.09 0.56 52 5.13 378 2.04 N/A N/A N/A N/A N/A <1 N/A <1 N/A 39 N/A N/A <50
MW-6S Compliance Transition (Saprolite)7/8/2013 18.81 16.24 0.20 54 5.07 273 4.24 N/A N/A N/A N/A <1 <1 <1 <1 41 41 N/A <50 <50
MW-6S Compliance Transition (Saprolite)11/4/2013 22.18 14.97 0.10 50 5.19 354 3.32 N/A N/A N/A N/A N/A <1 N/A <1 N/A 39 N/A N/A <50
MW-6S Compliance Transition (Saprolite)3/3/2014 19.24 15.38 1.24 49 5.12 364 1.36 N/A N/A N/A N/A N/A <1 N/A <1 N/A 41 N/A N/A <50
MW-6S Compliance Transition (Saprolite)7/1/2014 20.86 15.79 0.69 45 5.23 483 5.29 N/A N/A N/A N/A N/A <1 N/A <1 N/A 38 N/A N/A <50
MW-6S Compliance Transition (Saprolite)11/3/2014 24.42 14.82 1.44 46 5.27 523 8.43 N/A 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 Compliance Bedrock 3/8/2011 6.32 14.80 N/A 248 7.16 N/A 8.50 N/A N/A N/A N/A N/A <1 N/A <1 N/A 12 N/A N/A <50
MW-7D Compliance Bedrock 7/5/2011 6.69 17.00 N/A 184 6.90 N/A 7.00 N/A N/A N/A N/A N/A <1 N/A <1 N/A 15 N/A N/A <50
MW-7D Compliance Bedrock 11/2/2011 7.10 15.17 N/A 168 7.19 N/A 9.60 N/A N/A N/A N/A N/A <1 N/A <1 N/A 13 N/A N/A <50
MW-7D Compliance Bedrock 3/7/2012 6.40 14.95 1.56 155 6.85 283 9.30 N/A N/A N/A N/A N/A <1 N/A <1 N/A 14 N/A N/A <50
MW-7D Compliance Bedrock 7/3/2012 6.62 15.71 1.94 161 6.88 316 9.66 N/A N/A N/A N/A N/A <1 N/A <1 N/A 13 N/A N/A <50
MW-7D Compliance Bedrock 11/7/2012 6.60 15.22 2.09 158 6.82 403 14.30 <5 N/A N/A N/A N/A <1 N/A <1 N/A 19 N/A N/A <50
MW-7D Compliance Bedrock 3/6/2013 6.09 14.06 1.61 131 6.42 323 7.17 N/A N/A N/A N/A N/A <1 N/A <1 N/A 10 N/A N/A <50
MW-7D Compliance Bedrock 7/8/2013 6.34 16.26 0.88 148 6.52 147 4.54 N/A N/A N/A N/A <1 <1 <1 <1 12 14 N/A <50 <50
MW-7D Compliance Bedrock 11/4/2013 9.50 15.71 2.22 152 6.76 300 3.96 N/A N/A N/A N/A N/A <1 N/A <1 N/A 13 N/A N/A <50
MW-7D Compliance Bedrock 3/3/2014 8.55 14.80 0.59 151 6.30 270 3.15 N/A N/A N/A N/A N/A <1 N/A <1 N/A 14 N/A N/A <50
MW-7D Compliance Bedrock 7/1/2014 9.78 15.79 1.91 137 6.34 340 3.09 N/A N/A N/A N/A N/A <1 N/A <1 N/A 13 N/A N/A <50
MW-7D Compliance Bedrock 11/3/2014 10.77 15.16 1.59 145 6.52 372 3.16 N/A 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-7S Compliance Transition (Saprolite)3/8/2011 5.71 13.21 N/A 106 6.18 N/A 4.80 N/A N/A N/A N/A N/A <1 N/A <1 N/A 23 N/A N/A <50
MW-7S Compliance Transition (Saprolite)7/5/2011 7.39 15.84 N/A 102 5.88 N/A 8.30 N/A N/A N/A N/A N/A <1 N/A <1 N/A 23 N/A N/A <50
MW-7S Compliance Transition (Saprolite)11/2/2011 7.11 15.78 N/A 102 6.18 N/A 3.60 N/A N/A N/A N/A N/A <1 N/A <1 N/A 24 N/A N/A <50
MW-7S Compliance Transition (Saprolite)3/7/2012 5.85 14.35 2.48 100 5.82 416 2.12 N/A N/A N/A N/A N/A <1 N/A <1 N/A 21 N/A N/A <50
MW-7S Compliance Transition (Saprolite)7/3/2012 7.21 16.24 2.02 100 5.93 371 1.46 N/A N/A N/A N/A N/A <1 N/A <1 N/A 22 N/A N/A <50
MW-7S Compliance Transition (Saprolite)11/7/2012 6.87 15.98 1.54 101 5.86 428 1.04 <5 N/A N/A N/A N/A <1 N/A <1 N/A 25 N/A N/A <50
MW-7S Compliance Transition (Saprolite)3/6/2013 5.50 14.88 1.98 98 5.78 359 1.99 N/A N/A N/A N/A N/A <1 N/A <1 N/A 20 N/A N/A <50
MW-7S Compliance Transition (Saprolite)7/8/2013 5.95 15.81 1.48 95 5.80 260 1.14 N/A N/A N/A N/A <1 <1 <1 <1 24 24 N/A <50 <50
MW-7S Compliance Transition (Saprolite)11/4/2013 9.96 16.42 1.38 99 5.84 319 2.43 N/A N/A N/A N/A N/A <1 N/A <1 N/A 23 N/A N/A <50
MW-7S Compliance Transition (Saprolite)3/3/2014 7.38 14.51 1.82 97 5.76 318 1.37 N/A N/A N/A N/A N/A <1 N/A <1 N/A 24 N/A N/A <50
MW-7S Compliance Transition (Saprolite)7/1/2014 10.08 15.27 1.19 106 5.76 420 1.99 N/A N/A N/A N/A N/A <1 N/A <1 N/A 27 N/A N/A <50
MW-7S Compliance Transition (Saprolite)11/3/2014 11.66 15.76 1.08 102 5.83 386 2.40 N/A 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-8D Compliance Partially Weathered 3/7/2011 3.62 14.92 N/A 139 6.43 N/A 11.00 N/A N/A N/A N/A N/A <1 N/A <1 N/A 19 N/A N/A <50
MW-8D Compliance Partially Weathered 7/5/2011 7.11 17.95 N/A 129 6.33 N/A 16.00 N/A N/A N/A N/A N/A <1 N/A <1 N/A 18 N/A N/A <50
MW-8D Compliance Partially Weathered 11/2/2011 7.47 16.12 N/A 128 6.30 N/A 6.20 N/A N/A N/A N/A N/A <1 N/A <1 N/A 17 N/A N/A <50
MW-8D Compliance Partially Weathered 3/7/2012 3.17 14.61 4.09 128 6.52 366 3.55 N/A N/A N/A N/A N/A <1 N/A <1 N/A 16 N/A N/A <50
MW-8D Compliance Partially Weathered 7/3/2012 6.25 15.64 4.14 126 6.36 334 4.48 N/A N/A N/A N/A N/A <1 N/A <1 N/A 17 N/A N/A <50
MW-8D Compliance Partially Weathered 11/7/2012 7.47 15.39 4.16 126 6.33 347 2.59 <5 N/A N/A N/A N/A <1 N/A <1 N/A 17 N/A N/A <50
Tables - Page 9
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-N/A µg/L
NE NE NE NE 6.5 - 8.5 NE NE NE NE NE NE 4*
Analytical Method 2320B4d N/A N/A N/A N/A
Well Name Well Type Hydrostratigraphic Unit Sample Collection
Date Total Dissolved Total Dissolved Total Dissolved Total Total Dissolved TotalTotal
Analytical Parameter Antimony Arsenic Barium
15A NCAC 02L .0202(g) Groundwater Quality Standard 1*10 700
Field Measurements
Boron
Units µg/L µg/L µg/L µg/L
700
200.8 200.8 200.7 200.7
Alkalinity
MW-8D Compliance Partially Weathered 3/6/2013 3.53 12.70 5.02 127 6.17 339 4.77 N/A N/A N/A N/A N/A <1 N/A <1 N/A 16 N/A N/A <50
MW-8D Compliance Partially Weathered 7/8/2013 3.38 16.74 4.08 128 6.21 322 3.87 N/A N/A N/A N/A <1 <1 <1 <1 17 18 N/A <50 <50
MW-8D Compliance Partially Weathered 11/4/2013 6.57 14.59 4.20 127 6.32 315 4.78 N/A N/A N/A N/A N/A <1 N/A <1 N/A 17 N/A N/A <50
MW-8D Compliance Partially Weathered 3/3/2014 2.64 13.68 4.48 131 6.19 338 8.03 N/A N/A N/A N/A N/A <1 N/A <1 N/A 19 N/A N/A <50
MW-8D Compliance Partially Weathered 7/1/2014 4.98 16.09 4.59 127 6.16 338 11.00 N/A N/A N/A N/A N/A <1 N/A <1 N/A 17 N/A N/A <50
MW-8D Compliance Partially Weathered 11/3/2014 7.32 14.96 4.28 130 6.38 380 4.78 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
MW-8S Compliance Transition (Saprolite)3/7/2011 3.94 13.85 N/A 214 6.05 N/A 27.20 N/A N/A N/A N/A N/A <1 N/A <1 N/A 37 N/A N/A <50
MW-8S Compliance Transition (Saprolite)7/5/2011 7.90 17.21 N/A 128 6.13 N/A 47.10 N/A N/A N/A N/A N/A <1 N/A <1 N/A 29 N/A N/A <50
MW-8S Compliance Transition (Saprolite)11/2/2011 8.18 17.53 N/A 154 6.11 N/A 6.60 N/A N/A N/A N/A N/A <1 N/A <1 N/A 21 N/A N/A <50
MW-8S Compliance Transition (Saprolite)3/7/2012 3.66 13.99 1.15 204 6.25 359 70.30 N/A N/A N/A N/A N/A <1 N/A <1 N/A 53 N/A N/A <50
MW-8S Compliance Transition (Saprolite)7/3/2012 7.10 16.50 1.31 164 6.19 334 4.48 N/A N/A N/A N/A N/A <1 N/A <1 N/A 23 N/A N/A <50
MW-8S Compliance Transition (Saprolite)11/7/2012 8.19 16.72 1.70 160 6.25 355 2.04 <5 N/A N/A N/A N/A <1 N/A <1 N/A 21 N/A N/A <50
MW-8S Compliance Transition (Saprolite)3/6/2013 3.91 10.46 4.36 180 6.01 350 15.30 N/A N/A N/A N/A N/A <1 N/A <1 N/A 29 N/A N/A <50
MW-8S Compliance Transition (Saprolite)7/8/2013 3.89 20.17 3.82 152 6.19 311 19.50 N/A N/A N/A N/A <1 <1 <1 <1 16 41 N/A <50 <50
MW-8S Compliance Transition (Saprolite)11/4/2013 7.46 10.91 4.63 142 6.25 318 48.20 N/A N/A N/A N/A N/A <1 N/A <1 N/A 50 N/A N/A <50
MW-8S Compliance Transition (Saprolite)3/3/2014 3.23 11.33 3.76 140 6.03 347 86.50 N/A N/A N/A N/A N/A <1 N/A <1 N/A 44 N/A N/A <50
MW-8S Compliance Transition (Saprolite)7/1/2014 5.91 15.18 3.18 148 6.04 346 16.90 N/A N/A N/A N/A N/A <1 N/A <1 N/A 21 N/A N/A <50
MW-8S Compliance Transition (Saprolite)11/3/2014 8.20 15.51 3.81 143 6.29 389 11.40 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
MW-9D Compliance Bedrock 3/7/2011 6.52 14.94 N/A 187 6.46 N/A 15.00 N/A N/A N/A N/A N/A <1 N/A <1 N/A 25 N/A N/A <50
MW-9D Compliance Bedrock 7/5/2011 7.57 18.61 N/A 182 6.23 N/A 2.20 N/A N/A N/A N/A N/A <1 N/A <1 N/A 20 N/A N/A <50
MW-9D Compliance Bedrock 11/2/2011 7.02 16.77 N/A 183 6.48 N/A 2.10 N/A N/A N/A N/A N/A <1 N/A <1 N/A 20 N/A N/A <50
MW-9D Compliance Bedrock 3/7/2012 6.78 16.23 2.01 186 6.46 398 3.04 N/A N/A N/A N/A N/A <1 N/A <1 N/A 20 N/A N/A <50
MW-9D Compliance Bedrock 7/3/2012 7.51 17.00 1.87 183 5.22 368 1.76 N/A N/A N/A N/A N/A <1 N/A <1 N/A 28 N/A N/A <50
MW-9D Compliance Bedrock 11/7/2012 7.26 16.13 2.08 185 6.19 467 3.11 <5 N/A N/A N/A N/A <1 N/A <1 N/A 22 N/A N/A <50
MW-9D Compliance Bedrock 3/7/2013 6.71 15.64 1.91 193 6.10 346 1.58 N/A N/A N/A N/A N/A <1 N/A <1 N/A 19 N/A N/A <50
MW-9D Compliance Bedrock 7/9/2013 6.79 16.38 1.96 198 6.14 356 1.12 N/A N/A N/A N/A <1 <1 <1 <1 20 21 N/A <50 <50
MW-9D Compliance Bedrock 11/5/2013 7.22 16.10 1.91 203 6.13 324 4.14 N/A N/A N/A N/A N/A <1 N/A <1 N/A 22 N/A N/A <50
MW-9D Compliance Bedrock 3/4/2014 6.68 15.58 2.01 213 5.93 345 2.04 N/A N/A N/A N/A N/A <1 N/A <1 N/A 24 N/A N/A <50
MW-9D Compliance Bedrock 7/1/2014 7.47 16.11 1.90 218 6.23 509 2.22 N/A N/A N/A N/A N/A <1 N/A <1 N/A 23 N/A N/A <50
MW-9D Compliance Bedrock 11/3/2014 7.25 16.04 1.78 227 6.23 537 1.59 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
MW-9S Compliance Transition (Saprolite)3/7/2011 5.56 13.00 N/A 171 6.54 N/A 30.60 N/A N/A N/A N/A N/A <1 N/A <1 N/A 31 N/A N/A <50
MW-9S Compliance Transition (Saprolite)7/5/2011 7.11 18.99 N/A 177 6.25 N/A 9.90 N/A N/A N/A N/A N/A <1 N/A <1 N/A 29 N/A N/A <50
MW-9S Compliance Transition (Saprolite)11/2/2011 6.34 19.67 N/A 175 6.62 N/A 9.30 N/A N/A N/A N/A N/A <1 N/A <1 N/A 26 N/A N/A <50
MW-9S Compliance Transition (Saprolite)3/7/2012 6.12 14.33 1.92 179 6.47 406 3.01 N/A N/A N/A N/A N/A <1 N/A <1 N/A 22 N/A N/A <50
MW-9S Compliance Transition (Saprolite)7/3/2012 7.10 18.36 3.86 184 5.32 365 9.86 N/A N/A N/A N/A N/A <1 N/A <1 N/A 28 N/A N/A <50
MW-9S Compliance Transition (Saprolite)11/7/2012 6.65 17.89 1.90 190 6.11 476 6.03 <5 N/A N/A N/A N/A <1 N/A <1 N/A 29 N/A N/A <50
MW-9S Compliance Transition (Saprolite)3/7/2013 5.98 12.58 4.99 194 6.03 348 7.93 N/A N/A N/A N/A N/A <1 N/A <1 N/A 24 N/A N/A <50
MW-9S Compliance Transition (Saprolite)7/9/2013 6.08 18.27 1.13 209 6.04 356 0.91 N/A N/A N/A N/A <1 <1 <1 <1 27 28 N/A <50 <50
MW-9S Compliance Transition (Saprolite)11/5/2013 6.68 17.74 3.67 218 6.10 329 6.23 N/A N/A N/A N/A N/A <1 N/A <1 N/A 30 N/A N/A <50
MW-9S Compliance Transition (Saprolite)3/4/2014 5.98 12.11 3.80 218 5.78 348 8.26 N/A N/A N/A N/A N/A <1 N/A <1 N/A 33 N/A N/A <50
MW-9S Compliance Transition (Saprolite)7/1/2014 7.17 17.01 3.68 226 6.23 516 3.82 N/A N/A N/A N/A N/A <1 N/A <1 N/A 30 N/A N/A <50
MW-9S Compliance Transition (Saprolite)11/3/2014 6.74 18.05 3.84 246 6.23 495 8.16 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Tables - Page 10
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection
Date
MW-10D Compliance Partially Weathered 3/8/2011
MW-10D Compliance Partially Weathered 7/5/2011
MW-10D Compliance Partially Weathered 11/2/2011
MW-10D Compliance Partially Weathered 3/7/2012
MW-10D Compliance Partially Weathered 7/3/2012
MW-10D Compliance Partially Weathered 11/7/2012
MW-10D Compliance Partially Weathered 3/6/2013
MW-10D Compliance Partially Weathered 7/8/2013
MW-10D Compliance Partially Weathered 11/5/2013
MW-10D Compliance Partially Weathered 3/4/2014
MW-10D Compliance Partially Weathered 7/1/2014
MW-10D Compliance Partially Weathered 11/3/2014
MW-11D Compliance Bedrock 3/7/2011
MW-11D Compliance Bedrock 7/5/2011
MW-11D Compliance Bedrock 11/2/2011
MW-11D Compliance Bedrock 3/7/2012
MW-11D Compliance Bedrock 7/3/2012
MW-11D Compliance Bedrock 11/7/2012
MW-11D Compliance Bedrock 3/7/2013
MW-11D Compliance Bedrock 7/9/2013
MW-11D Compliance Bedrock 11/5/2013
MW-11D Compliance Bedrock 3/4/2014
MW-11D Compliance Bedrock 7/1/2014
MW-11D Compliance Bedrock 11/3/2014
MW-11S Compliance Transition (Saprolite)3/7/2011
MW-11S Compliance Transition (Saprolite)7/5/2011
MW-11S Compliance Transition (Saprolite)11/2/2011
MW-11S Compliance Transition (Saprolite)3/7/2012
MW-11S Compliance Transition (Saprolite)7/3/2012
MW-11S Compliance Transition (Saprolite)11/7/2012
MW-11S Compliance Transition (Saprolite)3/7/2013
MW-11S Compliance Transition (Saprolite)7/9/2013
MW-11S Compliance Transition (Saprolite)11/5/2013
MW-11S Compliance Transition (Saprolite)3/4/2014
MW-11S Compliance Transition (Saprolite)7/1/2014
MW-11S Compliance Transition (Saprolite)11/3/2014
MW-12D Compliance Bedrock 3/8/2011
MW-12D Compliance Bedrock 7/5/2011
MW-12D Compliance Bedrock 11/2/2011
MW-12D Compliance Bedrock 3/7/2012
MW-12D Compliance Bedrock 7/3/2012
MW-12D Compliance Bedrock 11/7/2012
MW-12D Compliance Bedrock 3/7/2013
MW-12D Compliance Bedrock 7/9/2013
MW-12D Compliance Bedrock 11/4/2013
MW-12D Compliance Bedrock 3/4/2014
MW-12D Compliance Bedrock 7/1/2014
Analytical Parameter
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
Chloride
mg/L
250
300
Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total
N/A <1 N/A N/A 6.8 N/A <5 N/A N/A N/A <0.005 N/A 335 N/A <1 N/A N/A N/A 1130 N/A <0.05
N/A <1 N/A N/A 6.5 N/A <5 N/A N/A N/A <0.005 N/A 279 N/A <1 N/A N/A N/A 944 N/A <0.05
N/A <1 N/A N/A 6.5 N/A <5 N/A N/A N/A <0.005 N/A 193 N/A <1 N/A N/A N/A 734 N/A <0.05
N/A <1 N/A N/A 5.9 N/A <5 N/A N/A N/A <0.005 N/A 119 N/A <1 N/A N/A N/A 634 N/A <0.05
N/A <1 N/A N/A 5.2 N/A <5 N/A N/A N/A <0.005 N/A 104 N/A <1 N/A N/A N/A 539 N/A <0.05
N/A <1 N/A 82 5.5 N/A <5 N/A N/A N/A <0.005 N/A 136 N/A <1 N/A 37.2 N/A 392 N/A <0.05
N/A <1 N/A 84.9 5.5 N/A <5 N/A N/A N/A <0.005 N/A 188 N/A <1 N/A 38 N/A 310 N/A <0.05
<1 <1 90.6 90.6 5.7 <5 <5 N/A N/A <0.005 <0.005 35 110 <1 <1 40 40.1 203 272 <0.05 <0.05
N/A <1 N/A 92.5 5.4 N/A <5 N/A N/A N/A <0.005 N/A 61 N/A <1 N/A 41.1 N/A 159 N/A <0.05
N/A <1 N/A <100 5.5 N/A <5 N/A N/A N/A <0.005 N/A 701 N/A <1 N/A 40.3 N/A 228 N/A <0.05
N/A <1 N/A 97.7 5.5 N/A <5 N/A N/A N/A <0.005 N/A 56 N/A <1 N/A 42.4 N/A 110 N/A <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 N/A N/A N/A N/A
N/A <1 N/A N/A 9.4 N/A <5 N/A N/A N/A <0.005 N/A 318 N/A <1 N/A N/A N/A 21 N/A <0.05
N/A <1 N/A N/A 10 N/A <5 N/A N/A N/A <0.005 N/A 806 N/A 1.94 N/A N/A N/A 35 N/A <0.05
N/A <1 N/A N/A 10 N/A <5 N/A N/A N/A <0.005 N/A 968 N/A 2.62 N/A N/A N/A 56 N/A <0.05
N/A <1 N/A N/A 10 N/A <5 N/A N/A N/A <0.005 N/A 1720 N/A 5.1 N/A N/A N/A 69 N/A <0.05
N/A <1 N/A N/A 9.5 N/A <5 N/A N/A N/A <0.005 N/A 1260 N/A 2.82 N/A N/A N/A 41 N/A <0.05
N/A <1 N/A 14.7 9.6 N/A <5 N/A N/A N/A <0.005 N/A 1610 N/A 4.3 N/A 6.27 N/A 56 N/A <0.05
N/A <1 N/A 15.7 10 N/A <5 N/A N/A N/A <0.005 N/A 3230 N/A 8.42 N/A 6.67 N/A 122 N/A <0.05
<1 <1 12.2 15.4 10 <5 <5 N/A N/A <0.005 <0.005 26 3810 <1 6.51 5.07 7.05 27 81 <0.05 <0.05
N/A <1 N/A 15.1 9.6 N/A <5 N/A N/A N/A <0.005 N/A 2150 N/A 4.3 N/A 6.51 N/A 64 N/A <0.05
N/A <1 N/A 13.9 10 N/A <5 N/A N/A N/A <0.005 N/A 1710 N/A 2.57 N/A 6.02 N/A 41 N/A <0.05
N/A <1 N/A 19.6 10 N/A <5 N/A N/A N/A 0.009 N/A 7340 N/A 12.5 N/A 9.48 N/A 125 N/A <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 N/A N/A N/A N/A
N/A <1 N/A N/A 11 N/A <5 N/A N/A N/A <0.005 N/A 870 N/A <1 N/A N/A N/A 242 N/A <0.05
N/A <1 N/A N/A 11 N/A <5 N/A N/A N/A <0.005 N/A 218 N/A <1 N/A N/A N/A 153 N/A <0.05
N/A <1 N/A N/A 10 N/A <5 N/A N/A N/A <0.005 N/A 108 N/A <1 N/A N/A N/A 120 N/A <0.05
N/A <1 N/A N/A 8 N/A <5 N/A N/A N/A <0.005 N/A 96 N/A <1 N/A N/A N/A 136 N/A <0.05
N/A <1 N/A N/A 9.2 N/A <5 N/A N/A N/A <0.005 N/A 570 N/A <1 N/A N/A N/A 151 N/A <0.05
N/A <1 N/A 11.1 9.3 N/A <5 N/A N/A N/A <0.005 N/A 119 N/A <1 N/A 7.48 N/A 126 N/A <0.05
N/A <1 N/A 11 9.7 N/A <5 N/A N/A N/A <0.005 N/A 129 N/A <1 N/A 7.58 N/A 106 N/A <0.05
<1 <1 11.5 11.5 11 <5 <5 N/A N/A <0.005 <0.005 <10 316 <1 <1 7.69 7.84 102 111 <0.05 <0.05
N/A <1 N/A 12.1 12 N/A <5 N/A N/A N/A <0.005 N/A 375 N/A <1 N/A 8.17 N/A 139 N/A <0.05
N/A <1 N/A 13.3 14 N/A <5 N/A N/A N/A <0.005 N/A 1150 N/A <1 N/A 9.03 N/A 132 N/A <0.05
N/A <1 N/A 12 15 N/A <5 N/A N/A N/A <0.005 N/A 63 N/A <1 N/A 8.12 N/A 129 N/A <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 N/A N/A N/A N/A
N/A <1 N/A N/A 2.2 N/A <5 N/A N/A N/A <0.005 N/A 1070 N/A 3.21 N/A N/A N/A 50 N/A <0.05
N/A <1 N/A N/A 2.3 N/A <5 N/A N/A N/A <0.005 N/A 871 N/A 2.71 N/A N/A N/A 33 N/A <0.05
N/A <1 N/A N/A 2.2 N/A <5 N/A N/A N/A <0.005 N/A 994 N/A 2.03 N/A N/A N/A 38 N/A <0.05
N/A <1 N/A N/A 2.1 N/A <5 N/A N/A N/A <0.005 N/A 530 N/A 1.5 N/A N/A N/A 19 N/A <0.05
N/A <1 N/A N/A 1.9 N/A <5 N/A N/A N/A <0.005 N/A 281 N/A <1 N/A N/A N/A 12 N/A <0.05
N/A <1 N/A 5.44 2.1 N/A <5 N/A N/A N/A <0.005 N/A 203 N/A <1 N/A 1.87 N/A 10 N/A <0.05
N/A <1 N/A 5.06 2.1 N/A <5 N/A N/A N/A <0.005 N/A 130 N/A <1 N/A 1.71 N/A 7 N/A <0.05
<1 <1 5.1 5.37 2.2 <5 <5 N/A N/A <0.005 <0.005 <10 201 <1 <1 1.71 1.81 <5 7 <0.05 <0.05
N/A <1 N/A 5.21 2.1 N/A <5 N/A N/A N/A <0.005 N/A 94 N/A <1 N/A 1.77 N/A <5 N/A <0.05
N/A <1 N/A 5.36 2.2 N/A <5 N/A N/A N/A <0.005 N/A 281 N/A <1 N/A 1.78 N/A 7 N/A <0.05
N/A <1 N/A 5.38 2.2 N/A <5 N/A N/A N/A <0.005 N/A 83 N/A <1 N/A 1.81 N/A <5 N/A <0.05
Iron LeadCadmium
µg/Lmg/L µg/L µg/Lµg/L
Magnesium Manganese MercuryCalciumChromiumCobaltCopper
2
µg/L µg/L µg/L
NE 10 1*
mg/L µg/L
NE 50 1130015
200.7 200.8 245.1200.8 200.8200.7 200.7 200.8 200.7 200.7
Tables - Page 11
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection
Date
Analytical Parameter
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
MW-12D Compliance Bedrock 11/3/2014
MW-12S Compliance Transition (Saprolite)3/8/2011
MW-12S Compliance Transition (Saprolite)7/5/2011
MW-12S Compliance Transition (Saprolite)11/2/2011
MW-12S Compliance Transition (Saprolite)3/7/2012
MW-12S Compliance Transition (Saprolite)7/3/2012
MW-12S Compliance Transition (Saprolite)11/7/2012
MW-12S Compliance Transition (Saprolite)3/7/2013
MW-12S Compliance Transition (Saprolite)7/9/2013
MW-12S Compliance Transition (Saprolite)11/4/2013
MW-12S Compliance Transition (Saprolite)3/4/2014
MW-12S Compliance Transition (Saprolite)7/1/2014
MW-12S Compliance Transition (Saprolite)11/3/2014
MW-13D Compliance Bedrock 3/8/2011
MW-13D Compliance Bedrock 7/5/2011
MW-13D Compliance Bedrock 11/2/2011
MW-13D Compliance Bedrock 3/7/2012
MW-13D Compliance Bedrock 7/3/2012
MW-13D Compliance Bedrock 11/7/2012
MW-13D Compliance Bedrock 3/6/2013
MW-13D Compliance Bedrock 7/8/2013
MW-13D Compliance Bedrock 11/4/2013
MW-13D Compliance Bedrock 3/3/2014
MW-13D Compliance Bedrock 7/1/2014
MW-13D Compliance Bedrock 11/3/2014
MW-1D Voluntary Bedrock 11/15/2006
MW-1D Voluntary Bedrock 5/15/2007
MW-1D Voluntary Bedrock 11/19/2007
MW-1D Voluntary Bedrock 5/21/2008
MW-1D Voluntary Bedrock 11/24/2008
MW-1D Voluntary Bedrock 5/12/2009
MW-1D Voluntary Bedrock 11/2/2009
MW-1D Voluntary Bedrock 5/25/2010
MW-1D Voluntary Bedrock 11/4/2013
MW-1S Voluntary Transition (Saprolite)11/15/2006
MW-1S Voluntary Transition (Saprolite)5/15/2007
MW-1S Voluntary Transition (Saprolite)11/19/2007
MW-1S Voluntary Transition (Saprolite)5/21/2008
MW-1S Voluntary Transition (Saprolite)11/24/2008
MW-1S Voluntary Transition (Saprolite)11/25/2008
MW-1S Voluntary Transition (Saprolite)5/12/2009
MW-1S Voluntary Transition (Saprolite)11/2/2009
MW-1S Voluntary Transition (Saprolite)5/25/2010
MW-1S Voluntary Transition (Saprolite)3/8/2011
MW-1S Voluntary Transition (Saprolite)7/5/2011
MW-1S Voluntary Transition (Saprolite)11/2/2011
MW-1S Voluntary Transition (Saprolite)11/4/2013
Chloride
mg/L
250
300
Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total
Iron LeadCadmium
µg/Lmg/L µg/L µg/Lµg/L
Magnesium Manganese MercuryCalciumChromiumCobaltCopper
2
µg/L µg/L µg/L
NE 10 1*
mg/L µg/L
NE 50 1130015
200.7 200.8 245.1200.8 200.8200.7 200.7 200.8 200.7 200.7
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A <1 N/A N/A 4.2 N/A 11 N/A N/A N/A <0.005 N/A 478 N/A <1 N/A N/A N/A 444 N/A <0.05
N/A <1 N/A N/A 3.6 N/A 13 N/A N/A N/A <0.005 N/A 246 N/A <1 N/A N/A N/A 239 N/A <0.05
N/A <1 N/A N/A 2.6 N/A 28 N/A N/A N/A <0.005 N/A 119 N/A <1 N/A N/A N/A 316 N/A <0.05
N/A <1 N/A N/A 3.4 N/A <5 N/A N/A N/A <0.005 N/A 196 N/A <1 N/A N/A N/A 122 N/A <0.05
N/A <1 N/A N/A 2.2 N/A <5 N/A N/A N/A <0.005 N/A 157 N/A <1 N/A N/A N/A 137 N/A <0.05
N/A <1 N/A 5.21 2.4 N/A <5 N/A N/A N/A <0.005 N/A 117 N/A <1 N/A 2.2 N/A 140 N/A <0.05
N/A <1 N/A 4.79 6.5 N/A <5 N/A N/A N/A <0.005 N/A 259 N/A <1 N/A 2.14 N/A 52 N/A <0.05
<1 <1 4.76 4.76 3.7 <5 <5 N/A N/A <0.005 <0.005 39 571 <1 <1 2.02 2.1 27 35 <0.05 <0.05
N/A <1 N/A 4.82 4 N/A <5 N/A N/A N/A <0.005 N/A 721 N/A <1 N/A 2.16 N/A 68 N/A <0.05
N/A <1 N/A 4.82 3 N/A <5 N/A N/A N/A <0.005 N/A 329 N/A <1 N/A 2.03 N/A 53 N/A <0.05
N/A <1 N/A 4.93 2.5 N/A <5 N/A N/A N/A <0.005 N/A 236 N/A <1 N/A 2.05 N/A 79 N/A <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 N/A N/A N/A N/A
N/A <1 N/A N/A 6 N/A <5 N/A N/A N/A <0.005 N/A 179 N/A <1 N/A N/A N/A 15 N/A <0.05
N/A <1 N/A N/A 6 N/A <5 N/A N/A N/A <0.005 N/A 257 N/A <1 N/A N/A N/A 6 N/A <0.05
N/A <1 N/A N/A 6.1 N/A <5 N/A N/A N/A <0.005 N/A 64 N/A <1 N/A N/A N/A <5 N/A <0.05
N/A <1 N/A N/A 5.8 N/A <5 N/A N/A N/A <0.005 N/A 263 N/A <1 N/A N/A N/A <5 N/A <0.05
N/A <1 N/A N/A 5.1 N/A <5 N/A N/A N/A <0.005 N/A 47 N/A <1 N/A N/A N/A <5 N/A <0.05
N/A <1 N/A 12.3 5.6 N/A <5 N/A N/A N/A <0.005 N/A 42 N/A <1 N/A 5.32 N/A <5 N/A <0.05
N/A <1 N/A 11.1 5.9 N/A <5 N/A N/A N/A <0.005 N/A 228 N/A <1 N/A 4.83 N/A <5 N/A <0.05
<1 <1 12.5 12.6 5 <5 5 N/A N/A <0.005 <0.005 16 680 <1 <1 5.33 5.51 <5 6 <0.05 <0.05
N/A <1 N/A 13.1 5.8 N/A 5 N/A N/A N/A <0.005 N/A 344 N/A <1 N/A 5.66 N/A <5 N/A <0.05
N/A <1 N/A 12.9 5.7 N/A 7 N/A N/A N/A <0.005 N/A 1260 N/A <1 N/A 5.49 N/A 8 N/A <0.05
N/A <1 N/A 15 6.2 N/A 5 N/A N/A N/A <0.005 N/A 134 N/A <1 N/A 6.33 N/A <5 N/A <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 N/A N/A N/A N/A
N/A <0.5 N/A 41.204 10.43 N/A 1.18 N/A N/A N/A 0.004 N/A 161 N/A <2 N/A 22.432 N/A 53 N/A <0.2
N/A <0.5 N/A 42.703 9.22 N/A <1 N/A N/A N/A <0.002 N/A 125 N/A <2 N/A 23.055 N/A 43 N/A <0.1
N/A <0.5 N/A 42 10.66 N/A <1 N/A N/A N/A <0.002 N/A 169 N/A <2 N/A 22.3 N/A 27 N/A <0.1
N/A <0.5 N/A 43.2 11 N/A <1 N/A N/A N/A <0.002 N/A 33 N/A <2 N/A 22.9 N/A 27 N/A <0.05
N/A <0.5 N/A 41.5 11 N/A 1.06 N/A N/A N/A <0.002 N/A 55 N/A <2 N/A 22.3 N/A 23 N/A <0.05
N/A <0.5 N/A 40 13 N/A <1 N/A N/A N/A <0.001 N/A 34 N/A <1 N/A 21.2 N/A 21 N/A <0.05
N/A <1 N/A 40.5 13 N/A <1 N/A N/A N/A <0.001 N/A 20.5 N/A <1 N/A 21.2 N/A 19.3 N/A <0.05
N/A <1 N/A 37.5 15 N/A <1 N/A N/A N/A <0.001 N/A 50.4 N/A <1 N/A 19.6 N/A 13 N/A <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 N/A N/A N/A N/A
N/A <0.5 N/A 32.888 13.09 N/A 4.88 N/A N/A N/A 0.013 N/A 4682 N/A <2 N/A 29.447 N/A 476 N/A <0.2
N/A <0.5 N/A 32.917 10.9 N/A 6.4 N/A N/A N/A 0.015 N/A 3420 N/A <2 N/A 28.781 N/A 402 N/A <0.1
N/A <0.5 N/A 31.6 12.53 N/A 5.29 N/A N/A N/A 0.009 N/A 3180 N/A <2 N/A 26.9 N/A 215 N/A <0.1
N/A <0.5 N/A 33.8 13 N/A 3.94 N/A N/A N/A 0.008 N/A 4020 N/A <2 N/A 28.5 N/A 325 N/A <0.05
N/A <0.5 N/A 30.9 13 N/A 5 N/A N/A N/A 0.007 N/A 2210 N/A <2 N/A 26.2 N/A 148 N/A <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 N/A N/A N/A N/A
N/A <0.5 N/A 27.4 20 N/A 1.4 N/A N/A N/A 0.003 N/A 1210 N/A <1 N/A 23 N/A 82 N/A <0.05
N/A <1 N/A 27.7 19 N/A 1.8 N/A N/A N/A 0.002 N/A 804 N/A <1 N/A 22.4 N/A 63.7 N/A <0.05
N/A <1 N/A 26.5 22 N/A 2.33 N/A N/A N/A 0.003 N/A 1520 N/A <1 N/A 22.2 N/A 78.3 N/A <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 N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Tables - Page 12
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection
Date
Analytical Parameter
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
MW-2D Voluntary Bedrock 11/15/2006
MW-2D Voluntary Bedrock 5/16/2007
MW-2D Voluntary Bedrock 11/19/2007
MW-2D Voluntary Bedrock 5/21/2008
MW-2S Voluntary Transition (Saprolite)11/15/2006
MW-2S Voluntary Transition (Saprolite)5/16/2007
MW-2S Voluntary Transition (Saprolite)11/19/2007
MW-2S Voluntary Transition (Saprolite)5/21/2008
MW-3D Voluntary Bedrock 11/15/2006
MW-3D Voluntary Bedrock 5/15/2007
MW-3D Voluntary Bedrock 11/19/2007
MW-3D Voluntary Bedrock 5/21/2008
MW-3D Voluntary Bedrock 11/24/2008
MW-3D Voluntary Bedrock 5/12/2009
MW-3D Voluntary Bedrock 11/2/2009
MW-3D Voluntary Bedrock 5/25/2010
MW-3D Voluntary Bedrock 11/4/2013
MW-3S Voluntary Transition (Saprolite)11/15/2006
MW-3S Voluntary Transition (Saprolite)5/15/2007
MW-3S Voluntary Transition (Saprolite)11/19/2007
MW-3S Voluntary Transition (Saprolite)5/21/2008
MW-3S Voluntary Transition (Saprolite)11/24/2008
MW-3S Voluntary Transition (Saprolite)5/12/2009
MW-3S Voluntary Transition (Saprolite)11/2/2009
MW-3S Voluntary Transition (Saprolite)5/25/2010
MW-3S Voluntary Transition (Saprolite)3/7/2011
MW-3S Voluntary Transition (Saprolite)7/5/2011
MW-3S Voluntary Transition (Saprolite)11/2/2011
MW-3S Voluntary Transition (Saprolite)11/4/2013
MW-4D Voluntary Bedrock 11/14/2006
MW-4D Voluntary Bedrock 5/15/2007
MW-4D Voluntary Bedrock 11/19/2007
MW-4D Voluntary Bedrock 5/21/2008
MW-4D Voluntary Bedrock 11/24/2008
MW-4D Voluntary Bedrock 5/12/2009
MW-4D Voluntary Bedrock 11/2/2009
MW-4D Voluntary Bedrock 5/25/2010
MW-4D Voluntary Bedrock 11/4/2013
MW-4S Voluntary Transition (Saprolite)11/14/2006
MW-4S Voluntary Transition (Saprolite)5/15/2007
MW-4S Voluntary Transition (Saprolite)11/19/2007
MW-4S Voluntary Transition (Saprolite)5/21/2008
MW-4S Voluntary Transition (Saprolite)11/24/2008
MW-4S Voluntary Transition (Saprolite)5/12/2009
MW-4S Voluntary Transition (Saprolite)11/2/2009
MW-4S Voluntary Transition (Saprolite)5/25/2010
MW-4S Voluntary Transition (Saprolite)3/7/2011
Chloride
mg/L
250
300
Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total
Iron LeadCadmium
µg/Lmg/L µg/L µg/Lµg/L
Magnesium Manganese MercuryCalciumChromiumCobaltCopper
2
µg/L µg/L µg/L
NE 10 1*
mg/L µg/L
NE 50 1130015
200.7 200.8 245.1200.8 200.8200.7 200.7 200.8 200.7 200.7
N/A <0.5 N/A 23.254 5.28 N/A 16.17 N/A N/A N/A 0.033 N/A 9817 N/A <2 N/A 12.161 N/A 267 N/A <0.2
N/A <0.5 N/A 19.723 4.78 N/A 10 N/A N/A N/A 0.011 N/A 1826 N/A <2 N/A 8.089 N/A 66 N/A <0.1
N/A <0.5 N/A 21.5 4.51 N/A 3.43 N/A N/A N/A <0.002 N/A 166 N/A <2 N/A 8.17 N/A 7 N/A <0.1
N/A <0.5 N/A 21.3 5.6 N/A 4.33 N/A N/A N/A <0.002 N/A 124 N/A <2 N/A 8.1 N/A 6 N/A <0.05
N/A <0.5 N/A 15.945 7.67 N/A <1 N/A N/A N/A <0.002 N/A 102 N/A <2 N/A 13.387 N/A 361 N/A <0.2
N/A <0.5 N/A 17.397 8.86 N/A <1 N/A N/A N/A <0.002 N/A 87 N/A <2 N/A 14.681 N/A 400 N/A <0.1
N/A <0.5 N/A 16.6 6.99 N/A <1 N/A N/A N/A 0.002 N/A 215 N/A <2 N/A 13.8 N/A 466 N/A <0.1
N/A <0.5 N/A 16.8 9.1 N/A <1 N/A N/A N/A <0.002 N/A 177 N/A <2 N/A 13.9 N/A 296 N/A <0.05
N/A <0.5 N/A 37.82 9.09 N/A <1 N/A N/A N/A <0.002 N/A 342 N/A <2 N/A 15.761 N/A 73 N/A <0.2
N/A <0.5 N/A 36.932 7.99 N/A <1 N/A N/A N/A 0.003 N/A 83 N/A <2 N/A 15.455 N/A 56 N/A <0.1
N/A <0.5 N/A 34.5 8.99 N/A <1 N/A N/A N/A <0.002 N/A 57 N/A <2 N/A 14.2 N/A 48 N/A <0.1
N/A <0.5 N/A 35.9 8.6 N/A <1 N/A N/A N/A <0.002 N/A 13 N/A <2 N/A 14.8 N/A 49 N/A <0.05
N/A <0.5 N/A 31.4 9 N/A <1 N/A N/A N/A <0.002 N/A 13 N/A <2 N/A 13.1 N/A 43 N/A <0.05
N/A <0.5 N/A 31.8 9.5 N/A <1 N/A N/A N/A <0.001 N/A 14 N/A <1 N/A 13 N/A 42 N/A <0.05
N/A <1 N/A 31.9 9 N/A <1 N/A N/A N/A <0.001 N/A <10 N/A <1 N/A 13 N/A 42.6 N/A <0.05
N/A <1 N/A 29.4 9.1 N/A <1 N/A N/A N/A <0.001 N/A <10 N/A <1 N/A 11.9 N/A 39.1 N/A <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 N/A N/A N/A N/A
N/A <0.5 N/A 11.023 10.8 N/A <1 N/A N/A N/A <0.002 N/A 928 N/A <2 N/A 8.514 N/A 2672 N/A <0.2
N/A <0.5 N/A 12 9.18 N/A <1 N/A N/A N/A <0.002 N/A 1076 N/A <2 N/A 9.379 N/A 2796 N/A <0.1
N/A <0.5 N/A 10.3 10.6 N/A <1 N/A N/A N/A <0.002 N/A 604 N/A <2 N/A 8 N/A 2310 N/A <0.1
N/A <0.5 N/A 10.6 10 N/A <1 N/A N/A N/A <0.002 N/A 882 N/A <2 N/A 8.3 N/A 2310 N/A <0.05
N/A <0.5 N/A 9.2 10 N/A 1.11 N/A N/A N/A <0.002 N/A 1470 N/A <2 N/A 7.4 N/A 1990 N/A <0.05
N/A <0.5 N/A 9.41 10 N/A <1 N/A N/A N/A <0.001 N/A 1750 N/A <1 N/A 7.58 N/A 1990 N/A <0.05
N/A <1 N/A 8.9 9.8 N/A <1 N/A N/A N/A <0.001 N/A 645 N/A <1 N/A 7.01 N/A 1950 N/A <0.05
N/A <1 N/A 8.92 9.4 N/A <1 N/A N/A N/A <0.001 N/A 947 N/A <1 N/A 6.88 N/A 1850 N/A <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 N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A <0.5 N/A 16.947 8.15 N/A <1 N/A N/A N/A <0.002 N/A 105 N/A <2 N/A 7.658 N/A 31 N/A <0.2
N/A <0.5 N/A 16.671 7.64 N/A <1 N/A N/A N/A <0.002 N/A 11 N/A <2 N/A 7.533 N/A 9 N/A <0.1
N/A <0.5 N/A 15.7 6.39 N/A <1 N/A N/A N/A <0.002 N/A <10 N/A <2 N/A 6.92 N/A 7 N/A <0.1
N/A <0.5 N/A 16.2 5.8 N/A <1 N/A N/A N/A <0.002 N/A 24 N/A <2 N/A 7.22 N/A 5 N/A 0.125
N/A <0.5 N/A 15.1 6.4 N/A <1 N/A N/A N/A <0.002 N/A <10 N/A <2 N/A 6.73 N/A <5 N/A <0.05
N/A <0.5 N/A 15.6 8.5 N/A <1 N/A N/A N/A <0.001 N/A 165 N/A <1 N/A 7.04 N/A <5 N/A <0.05
N/A <1 N/A 16 8.4 N/A <1 N/A N/A N/A <0.001 N/A <10 N/A <1 N/A 7.01 N/A <5 N/A <0.05
N/A <1 N/A 15.3 8.9 N/A <1 N/A N/A N/A <0.001 N/A <10 N/A <1 N/A 6.64 N/A <5 N/A <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 N/A N/A N/A N/A
N/A <0.5 N/A 10.738 8.22 N/A <1 N/A N/A N/A <0.002 N/A 404 N/A <2 N/A 8.32 N/A 286 N/A <0.2
N/A <0.5 N/A 10.171 7.91 N/A <1 N/A N/A N/A 0.002 N/A 435 N/A <2 N/A 8.119 N/A 153 N/A <0.1
N/A <0.5 N/A 9.94 7.62 N/A <1 N/A N/A N/A <0.002 N/A 1040 N/A <2 N/A 7.87 N/A 103 N/A <0.1
N/A <0.5 N/A 10.7 8 N/A 1.69 N/A N/A N/A 0.003 N/A 6160 N/A <2 N/A 10.2 N/A 159 N/A <0.05
N/A <0.5 N/A 9.9 8.3 N/A <1 N/A N/A N/A <0.002 N/A 232 N/A <2 N/A 7.71 N/A 72 N/A <0.05
N/A <0.5 N/A 11.2 9 N/A <1 N/A N/A N/A 0.002 N/A 9210 N/A 1.9 N/A 10.2 N/A 192 N/A <0.05
N/A <1 N/A 11.2 10 N/A <1 N/A N/A N/A <0.001 N/A 1360 N/A <1 N/A 8.38 N/A 81 N/A <0.05
N/A <1 N/A 10.8 8.5 N/A <1 N/A N/A N/A <0.001 N/A 694 N/A <1 N/A 7.76 N/A 69.6 N/A <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 N/A N/A N/A N/A
Tables - Page 13
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection
Date
Analytical Parameter
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
MW-4S Voluntary Transition (Saprolite)7/5/2011
MW-4S Voluntary Transition (Saprolite)11/2/2011
MW-4S Voluntary Transition (Saprolite)11/4/2013
MW-5D Voluntary Bedrock 11/15/2006
MW-5D Voluntary Bedrock 5/16/2007
MW-5D Voluntary Bedrock 11/20/2007
MW-5D Voluntary Bedrock 5/21/2008
MW-5D Voluntary Bedrock 11/24/2008
MW-5D Voluntary Bedrock 5/12/2009
MW-5D Voluntary Bedrock 11/2/2009
MW-5D Voluntary Bedrock 5/25/2010
MW-5D Voluntary Bedrock 11/4/2013
MW-5S Voluntary Transition (Saprolite)11/15/2006
MW-5S Voluntary Transition (Saprolite)5/16/2007
MW-5S Voluntary Transition (Saprolite)11/20/2007
MW-5S Voluntary Transition (Saprolite)5/21/2008
MW-5S Voluntary Transition (Saprolite)11/24/2008
MW-5S Voluntary Transition (Saprolite)5/12/2009
MW-5S Voluntary Transition (Saprolite)11/2/2009
MW-5S Voluntary Transition (Saprolite)5/25/2010
MW-5S Voluntary Transition (Saprolite)3/8/2011
MW-5S Voluntary Transition (Saprolite)7/5/2011
MW-5S Voluntary Transition (Saprolite)11/2/2011
MW-5S Voluntary Transition (Saprolite)11/4/2013
MW-6D Compliance Bedrock 11/14/2006
MW-6D Compliance Bedrock 5/15/2007
MW-6D Compliance Bedrock 11/20/2007
MW-6D Compliance Bedrock 5/21/2008
MW-6D Compliance Bedrock 11/24/2008
MW-6D Compliance Bedrock 5/12/2009
MW-6D Compliance Bedrock 11/2/2009
MW-6D Compliance Bedrock 5/25/2010
MW-6D Compliance Bedrock 3/7/2011
MW-6D Compliance Bedrock 7/5/2011
MW-6D Compliance Bedrock 11/2/2011
MW-6D Compliance Bedrock 3/7/2012
MW-6D Compliance Bedrock 7/3/2012
MW-6D Compliance Bedrock 11/7/2012
MW-6D Compliance Bedrock 3/6/2013
MW-6D Compliance Bedrock 7/8/2013
MW-6D Compliance Bedrock 11/4/2013
MW-6D Compliance Bedrock 3/3/2014
MW-6D Compliance Bedrock 7/1/2014
MW-6D Compliance Bedrock 11/3/2014
MW-6S Compliance Transition (Saprolite)11/14/2006
MW-6S Compliance Transition (Saprolite)5/15/2007
MW-6S Compliance Transition (Saprolite)11/20/2007
Chloride
mg/L
250
300
Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total
Iron LeadCadmium
µg/Lmg/L µg/L µg/Lµg/L
Magnesium Manganese MercuryCalciumChromiumCobaltCopper
2
µg/L µg/L µg/L
NE 10 1*
mg/L µg/L
NE 50 1130015
200.7 200.8 245.1200.8 200.8200.7 200.7 200.8 200.7 200.7
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A <0.5 N/A 16.458 9.12 N/A <1 N/A N/A N/A <0.002 N/A 62 N/A <2 N/A 6.647 N/A 17 N/A <0.2
N/A <0.5 N/A 15.818 8.3 N/A <1 N/A N/A N/A <0.002 N/A 41 N/A <2 N/A 6.502 N/A 8 N/A <0.1
N/A <0.5 N/A 14.5 9.43 N/A <1 N/A N/A N/A <0.002 N/A 40 N/A <2 N/A 5.9 N/A 8 N/A <0.1
N/A <0.5 N/A 15.2 9.3 N/A <1 N/A N/A N/A <0.002 N/A 12 N/A <2 N/A 6.21 N/A <5 N/A <0.05
N/A <0.5 N/A 14.2 8.6 N/A <1 N/A N/A N/A <0.002 N/A <10 N/A <2 N/A 5.86 N/A <5 N/A <0.05
N/A <0.5 N/A 15 9.4 N/A <1 N/A N/A N/A <0.001 N/A 49 N/A <1 N/A 6.13 N/A <5 N/A <0.05
N/A <1 N/A 15.4 9.1 N/A <1 N/A N/A N/A <0.001 N/A <10 N/A <1 N/A 6.12 N/A <5 N/A <0.05
N/A <1 N/A 14.7 9.5 N/A <1 N/A N/A N/A <0.001 N/A <10 N/A <1 N/A 5.82 N/A <5 N/A <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 N/A N/A N/A N/A
N/A <0.5 N/A 7.724 7.67 N/A <1 N/A N/A N/A 0.002 N/A 185 N/A <2 N/A 2.292 N/A 165 N/A <0.2
N/A <0.5 N/A 7.221 7.97 N/A 1.2 N/A N/A N/A 0.003 N/A 114 N/A <2 N/A 2.277 N/A 60 N/A <0.1
N/A <0.5 N/A 8.18 8.73 N/A 1.86 N/A N/A N/A 0.007 N/A 1220 N/A <2 N/A 2.6 N/A 62 N/A <0.1
N/A <0.5 N/A 8.14 9.6 N/A 1.02 N/A N/A N/A <0.002 N/A 194 N/A <2 N/A 2.48 N/A 15 N/A 0.054
N/A <0.5 N/A 8.13 8.2 N/A 1.58 N/A N/A N/A <0.002 N/A 66 N/A <2 N/A 2.41 N/A 7 N/A <0.05
N/A <0.5 N/A 7.71 9 N/A <1 N/A N/A N/A <0.001 N/A 135 N/A <1 N/A 2.4 N/A 8 N/A <0.05
N/A <1 N/A 8.19 8.8 N/A 1.3 N/A N/A N/A 0.003 N/A 788 N/A <1 N/A 2.43 N/A 28 N/A <0.05
N/A <1 N/A 7.01 9.5 N/A 1.26 N/A N/A N/A 0.002 N/A 232 N/A <1 N/A 2.32 N/A 8.74 N/A <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 N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A <0.5 N/A 5.469 1.21 N/A 2.35 N/A N/A N/A 0.005 N/A 641 N/A <2 N/A 3.409 N/A 53 N/A <0.2
N/A <0.5 N/A 5.826 1.32 N/A 3 N/A N/A N/A 0.004 N/A 247 N/A <2 N/A 3.653 N/A 15 N/A <0.1
N/A <0.5 N/A 5.81 1.63 N/A 2.33 N/A N/A N/A <0.002 N/A 37 N/A <2 N/A 3.59 N/A <5 N/A <0.1
N/A <0.5 N/A 7.26 2 N/A 1.58 N/A N/A N/A <0.002 N/A 10 N/A <2 N/A 4.41 N/A <5 N/A <0.05
N/A <0.5 N/A 7.56 1.7 N/A 1.74 N/A N/A N/A <0.002 N/A 10 N/A <2 N/A 4.62 N/A <5 N/A <0.05
N/A <0.5 N/A 8.79 2.3 N/A 1.1 N/A N/A N/A <0.001 N/A <10 N/A <1 N/A 5.28 N/A <5 N/A <0.05
N/A <1 N/A 9.35 2.1 N/A 1.4 N/A N/A N/A <0.001 N/A <10 N/A <1 N/A 5.46 N/A <5 N/A <0.05
N/A <1 N/A 9.83 2.2 N/A 1.1 N/A N/A N/A <0.001 N/A <10 N/A <1 N/A 5.7 N/A <5 N/A <0.05
N/A <1 N/A N/A 2.5 N/A <5 N/A N/A N/A <0.005 N/A 31 N/A <1 N/A N/A N/A <5 N/A <0.05
N/A <1 N/A N/A 2.7 N/A <5 N/A N/A N/A <0.005 N/A <10 N/A <1 N/A N/A N/A <5 N/A <0.05
N/A <1 N/A N/A 2.6 N/A <5 N/A N/A N/A <0.005 N/A <10 N/A <1 N/A N/A N/A <5 N/A <0.05
N/A <1 N/A N/A 2.6 N/A <5 N/A N/A N/A <0.005 N/A 26 N/A <1 N/A N/A N/A <5 N/A <0.05
N/A <1 N/A N/A 2.5 N/A <5 N/A N/A N/A <0.005 N/A 18 N/A <1 N/A N/A N/A <5 N/A <0.05
N/A <1 N/A 11.2 2.7 N/A <5 N/A N/A N/A <0.005 N/A 25 N/A <1 N/A 6.53 N/A <5 N/A <0.05
N/A <1 N/A 11.3 2.8 N/A <5 N/A N/A N/A <0.005 N/A 62 N/A <1 N/A 6.51 N/A <5 N/A <0.05
<1 <1 12.3 12.5 2.8 <5 <5 N/A N/A <0.005 <0.005 14 127 <1 <1 6.99 7.13 <5 <5 <0.05 <0.05
N/A <1 N/A 12.4 3 N/A <5 N/A N/A N/A <0.005 N/A 55 N/A <1 N/A 7.14 N/A <5 N/A <0.05
N/A <1 N/A 13 4.3 N/A <5 N/A N/A N/A <0.005 N/A 47 N/A <1 N/A 7.28 N/A <5 N/A <0.05
N/A <1 N/A 12.7 3.2 N/A <5 N/A N/A N/A <0.005 N/A 78 N/A <1 N/A 7.21 N/A <5 N/A <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 N/A N/A N/A N/A
N/A <0.5 N/A 2.286 4.13 N/A 1.78 N/A N/A N/A 0.005 N/A 652 N/A <2 N/A 2.67 N/A 54 N/A <0.2
N/A <0.5 N/A 1.997 4.23 N/A 2.3 N/A N/A N/A <0.002 N/A 36 N/A <2 N/A 2.372 N/A 20 N/A <0.1
N/A <0.5 N/A 2 3.81 N/A 2.58 N/A N/A N/A 0.002 N/A 799 N/A <2 N/A 2.4 N/A 34 N/A <0.1
Tables - Page 14
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection
Date
Analytical Parameter
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
MW-6S Compliance Transition (Saprolite)5/21/2008
MW-6S Compliance Transition (Saprolite)11/24/2008
MW-6S Compliance Transition (Saprolite)5/12/2009
MW-6S Compliance Transition (Saprolite)11/2/2009
MW-6S Compliance Transition (Saprolite)5/25/2010
MW-6S Compliance Transition (Saprolite)3/7/2011
MW-6S Compliance Transition (Saprolite)7/5/2011
MW-6S Compliance Transition (Saprolite)11/2/2011
MW-6S Compliance Transition (Saprolite)3/7/2012
MW-6S Compliance Transition (Saprolite)7/3/2012
MW-6S Compliance Transition (Saprolite)11/7/2012
MW-6S Compliance Transition (Saprolite)3/6/2013
MW-6S Compliance Transition (Saprolite)7/8/2013
MW-6S Compliance Transition (Saprolite)11/4/2013
MW-6S Compliance Transition (Saprolite)3/3/2014
MW-6S Compliance Transition (Saprolite)7/1/2014
MW-6S Compliance Transition (Saprolite)11/3/2014
MW-7D Compliance Bedrock 3/8/2011
MW-7D Compliance Bedrock 7/5/2011
MW-7D Compliance Bedrock 11/2/2011
MW-7D Compliance Bedrock 3/7/2012
MW-7D Compliance Bedrock 7/3/2012
MW-7D Compliance Bedrock 11/7/2012
MW-7D Compliance Bedrock 3/6/2013
MW-7D Compliance Bedrock 7/8/2013
MW-7D Compliance Bedrock 11/4/2013
MW-7D Compliance Bedrock 3/3/2014
MW-7D Compliance Bedrock 7/1/2014
MW-7D Compliance Bedrock 11/3/2014
MW-7S Compliance Transition (Saprolite)3/8/2011
MW-7S Compliance Transition (Saprolite)7/5/2011
MW-7S Compliance Transition (Saprolite)11/2/2011
MW-7S Compliance Transition (Saprolite)3/7/2012
MW-7S Compliance Transition (Saprolite)7/3/2012
MW-7S Compliance Transition (Saprolite)11/7/2012
MW-7S Compliance Transition (Saprolite)3/6/2013
MW-7S Compliance Transition (Saprolite)7/8/2013
MW-7S Compliance Transition (Saprolite)11/4/2013
MW-7S Compliance Transition (Saprolite)3/3/2014
MW-7S Compliance Transition (Saprolite)7/1/2014
MW-7S Compliance Transition (Saprolite)11/3/2014
MW-8D Compliance Partially Weathered 3/7/2011
MW-8D Compliance Partially Weathered 7/5/2011
MW-8D Compliance Partially Weathered 11/2/2011
MW-8D Compliance Partially Weathered 3/7/2012
MW-8D Compliance Partially Weathered 7/3/2012
MW-8D Compliance Partially Weathered 11/7/2012
Chloride
mg/L
250
300
Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total
Iron LeadCadmium
µg/Lmg/L µg/L µg/Lµg/L
Magnesium Manganese MercuryCalciumChromiumCobaltCopper
2
µg/L µg/L µg/L
NE 10 1*
mg/L µg/L
NE 50 1130015
200.7 200.8 245.1200.8 200.8200.7 200.7 200.8 200.7 200.7
N/A <0.5 N/A 2.15 4.5 N/A 2.05 N/A N/A N/A 0.002 N/A 995 N/A <2 N/A 2.62 N/A 38 N/A <0.05
N/A <0.5 N/A 1.87 3.5 N/A 2.36 N/A N/A N/A 0.002 N/A 710 N/A <2 N/A 2.29 N/A 40 N/A <0.05
N/A <0.5 N/A 1.96 4.3 N/A 1.6 N/A N/A N/A 0.001 N/A 505 N/A <1 N/A 2.33 N/A 27 N/A <0.05
N/A <1 N/A 1.88 4.2 N/A 1.5 N/A N/A N/A <0.001 N/A 306 N/A <1 N/A 2.18 N/A 21.1 N/A <0.05
N/A <1 N/A 2.2 4.7 N/A <1 N/A N/A N/A 0.006 N/A 1270 N/A <1 N/A 2.57 N/A 228 N/A <0.05
N/A <1 N/A N/A 4.9 N/A <5 N/A N/A N/A <0.005 N/A 323 N/A <1 N/A N/A N/A 100 N/A <0.05
N/A <1 N/A N/A 4.7 N/A <5 N/A N/A N/A <0.005 N/A 139 N/A <1 N/A N/A N/A 97 N/A <0.05
N/A <1 N/A N/A 4.8 N/A <5 N/A N/A N/A <0.005 N/A 56 N/A <1 N/A N/A N/A 59 N/A <0.05
N/A <1 N/A N/A 4.5 N/A <5 N/A N/A N/A <0.005 N/A 185 N/A <1 N/A N/A N/A 80 N/A <0.05
N/A <1 N/A N/A 4 N/A <5 N/A N/A N/A <0.005 N/A 137 N/A <1 N/A N/A N/A 114 N/A <0.05
N/A <1 N/A 2.25 4.2 N/A <5 N/A N/A N/A <0.005 N/A 51 N/A <1 N/A 2.63 N/A 60 N/A <0.05
N/A <1 N/A 2.34 4.6 N/A <5 N/A N/A N/A <0.005 N/A 142 N/A <1 N/A 2.71 N/A 72 N/A <0.05
<1 <1 2.51 2.49 4.6 <5 <5 N/A N/A <0.005 <0.005 210 201 <1 <1 2.91 2.89 153 135 <0.05 <0.05
N/A <1 N/A 2.34 4.6 N/A <5 N/A N/A N/A <0.005 N/A 247 N/A <1 N/A 2.69 N/A 73 N/A <0.05
N/A <1 N/A 2.36 4.7 N/A <5 N/A N/A N/A <0.005 N/A 37 N/A <1 N/A 2.67 N/A 73 N/A <0.05
N/A <1 N/A 2.2 4.7 N/A <5 N/A N/A N/A <0.005 N/A 70 N/A <1 N/A 2.51 N/A 43 N/A <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 N/A N/A N/A N/A
N/A <1 N/A N/A 3.7 N/A <5 N/A N/A N/A <0.005 N/A 265 N/A <1 N/A N/A N/A 98 N/A <0.05
N/A <1 N/A N/A 4.8 N/A <5 N/A N/A N/A <0.005 N/A 453 N/A <1 N/A N/A N/A 129 N/A <0.05
N/A <1 N/A N/A 2.5 N/A 5 N/A N/A N/A <0.005 N/A 274 N/A <1 N/A N/A N/A 45 N/A <0.05
N/A <1 N/A N/A 6.6 N/A <5 N/A N/A N/A <0.005 N/A 413 N/A <1 N/A N/A N/A 87 N/A <0.05
N/A <1 N/A N/A 3.6 N/A <5 N/A N/A N/A <0.005 N/A 234 N/A <1 N/A N/A N/A 41 N/A <0.05
N/A <1 N/A 14.6 2.4 N/A 5 N/A N/A N/A <0.005 N/A 334 N/A <1 N/A 6.7 N/A 19 N/A <0.05
N/A <1 N/A 8.09 7.4 N/A <5 N/A N/A N/A <0.005 N/A 218 N/A <1 N/A 4.51 N/A 19 N/A <0.05
<1 <1 9.89 9.44 8.3 <5 <5 N/A N/A <0.005 <0.005 <10 216 <1 <1 5.92 5.84 26 43 <0.05 <0.05
N/A <1 N/A 12.2 2.6 N/A <5 N/A N/A N/A <0.005 N/A 96 N/A <1 N/A 6.18 N/A 11 N/A <0.05
N/A <1 N/A 10.1 7.9 N/A <5 N/A N/A N/A <0.005 N/A 151 N/A <1 N/A 7.75 N/A 21 N/A <0.05
N/A <1 N/A 8.76 4.3 N/A <5 N/A N/A N/A <0.005 N/A 59 N/A <1 N/A 6.52 N/A 18 N/A <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 N/A N/A N/A N/A
N/A <1 N/A N/A 5.6 N/A 6 N/A N/A N/A <0.005 N/A 67 N/A <1 N/A N/A N/A 70 N/A <0.05
N/A <1 N/A N/A 5.8 N/A 8 N/A N/A N/A <0.005 N/A 199 N/A <1 N/A N/A N/A 36 N/A <0.05
N/A <1 N/A N/A 9.6 N/A 6 N/A N/A N/A <0.005 N/A 89 N/A <1 N/A N/A N/A 57 N/A <0.05
N/A <1 N/A N/A 6.3 N/A 8 N/A N/A N/A <0.005 N/A 41 N/A <1 N/A N/A N/A 30 N/A <0.05
N/A <1 N/A N/A 5.5 N/A 8 N/A N/A N/A <0.005 N/A 47 N/A <1 N/A N/A N/A 35 N/A <0.05
N/A <1 N/A 5.42 9 N/A 6 N/A N/A N/A <0.005 N/A 38 N/A <1 N/A 6.96 N/A 71 N/A <0.05
N/A <1 N/A 5.11 7 N/A 9 N/A N/A N/A <0.005 N/A 14 N/A <1 N/A 6.6 N/A 30 N/A <0.05
<1 <1 5.24 5.28 6.4 8 8 N/A N/A <0.005 <0.005 28 68 <1 <1 6.72 6.76 18 21 <0.05 <0.05
N/A <1 N/A 5.65 5.8 N/A 9 N/A N/A N/A <0.005 N/A 76 N/A <1 N/A 7.36 N/A 20 N/A <0.05
N/A <1 N/A 5.56 7.8 N/A 8 N/A N/A N/A <0.005 N/A 77 N/A <1 N/A 7.12 N/A 55 N/A <0.05
N/A <1 N/A 6.05 8.9 N/A 7 N/A N/A N/A <0.005 N/A 69 N/A <1 N/A 7.78 N/A 33 N/A <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 N/A N/A N/A N/A
N/A <1 N/A N/A 3.3 N/A <5 N/A N/A N/A <0.005 N/A 353 N/A <1 N/A N/A N/A 35 N/A <0.05
N/A <1 N/A N/A 3.3 N/A <5 N/A N/A N/A <0.005 N/A 147 N/A <1 N/A N/A N/A 13 N/A <0.05
N/A <1 N/A N/A 3.4 N/A <5 N/A N/A N/A <0.005 N/A 88 N/A <1 N/A N/A N/A 7 N/A <0.05
N/A <1 N/A N/A 3.2 N/A <5 N/A N/A N/A <0.005 N/A 129 N/A <1 N/A N/A N/A 6 N/A <0.05
N/A <1 N/A N/A 3 N/A <5 N/A N/A N/A <0.005 N/A 64 N/A <1 N/A N/A N/A <5 N/A <0.05
N/A <1 N/A 10.4 3.2 N/A <5 N/A N/A N/A <0.005 N/A 111 N/A <1 N/A 5.12 N/A <5 N/A <0.05
Tables - Page 15
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection
Date
Analytical Parameter
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
MW-8D Compliance Partially Weathered 3/6/2013
MW-8D Compliance Partially Weathered 7/8/2013
MW-8D Compliance Partially Weathered 11/4/2013
MW-8D Compliance Partially Weathered 3/3/2014
MW-8D Compliance Partially Weathered 7/1/2014
MW-8D Compliance Partially Weathered 11/3/2014
MW-8S Compliance Transition (Saprolite)3/7/2011
MW-8S Compliance Transition (Saprolite)7/5/2011
MW-8S Compliance Transition (Saprolite)11/2/2011
MW-8S Compliance Transition (Saprolite)3/7/2012
MW-8S Compliance Transition (Saprolite)7/3/2012
MW-8S Compliance Transition (Saprolite)11/7/2012
MW-8S Compliance Transition (Saprolite)3/6/2013
MW-8S Compliance Transition (Saprolite)7/8/2013
MW-8S Compliance Transition (Saprolite)11/4/2013
MW-8S Compliance Transition (Saprolite)3/3/2014
MW-8S Compliance Transition (Saprolite)7/1/2014
MW-8S Compliance Transition (Saprolite)11/3/2014
MW-9D Compliance Bedrock 3/7/2011
MW-9D Compliance Bedrock 7/5/2011
MW-9D Compliance Bedrock 11/2/2011
MW-9D Compliance Bedrock 3/7/2012
MW-9D Compliance Bedrock 7/3/2012
MW-9D Compliance Bedrock 11/7/2012
MW-9D Compliance Bedrock 3/7/2013
MW-9D Compliance Bedrock 7/9/2013
MW-9D Compliance Bedrock 11/5/2013
MW-9D Compliance Bedrock 3/4/2014
MW-9D Compliance Bedrock 7/1/2014
MW-9D Compliance Bedrock 11/3/2014
MW-9S Compliance Transition (Saprolite)3/7/2011
MW-9S Compliance Transition (Saprolite)7/5/2011
MW-9S Compliance Transition (Saprolite)11/2/2011
MW-9S Compliance Transition (Saprolite)3/7/2012
MW-9S Compliance Transition (Saprolite)7/3/2012
MW-9S Compliance Transition (Saprolite)11/7/2012
MW-9S Compliance Transition (Saprolite)3/7/2013
MW-9S Compliance Transition (Saprolite)7/9/2013
MW-9S Compliance Transition (Saprolite)11/5/2013
MW-9S Compliance Transition (Saprolite)3/4/2014
MW-9S Compliance Transition (Saprolite)7/1/2014
MW-9S Compliance Transition (Saprolite)11/3/2014
Chloride
mg/L
250
300
Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total
Iron LeadCadmium
µg/Lmg/L µg/L µg/Lµg/L
Magnesium Manganese MercuryCalciumChromiumCobaltCopper
2
µg/L µg/L µg/L
NE 10 1*
mg/L µg/L
NE 50 1130015
200.7 200.8 245.1200.8 200.8200.7 200.7 200.8 200.7 200.7
N/A <1 N/A 10.1 3.2 N/A <5 N/A N/A N/A <0.005 N/A 157 N/A <1 N/A 4.83 N/A <5 N/A <0.05
<1 <1 10.7 10.9 3.4 <5 <5 N/A N/A <0.005 <0.005 12 307 <1 <1 5.01 5.19 <5 5 <0.05 <0.05
N/A <1 N/A 10.3 3.2 N/A <5 N/A N/A N/A <0.005 N/A 224 N/A <1 N/A 4.99 N/A <5 N/A <0.05
N/A <1 N/A 11.1 3.3 N/A <5 N/A N/A N/A <0.005 N/A 432 N/A <1 N/A 5.31 N/A 6 N/A <0.05
N/A <1 N/A 10.7 3.4 N/A <5 N/A N/A N/A <0.005 N/A 87 N/A <1 N/A 5.06 N/A <5 N/A <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 N/A N/A N/A N/A
N/A <1 N/A N/A 3.7 N/A <5 N/A N/A N/A <0.005 N/A 559 N/A <1 N/A N/A N/A 360 N/A <0.05
N/A <1 N/A N/A 3.2 N/A <5 N/A N/A N/A <0.005 N/A 1360 N/A <1 N/A N/A N/A 84 N/A <0.05
N/A <1 N/A N/A 3.2 N/A <5 N/A N/A N/A <0.005 N/A 84 N/A <1 N/A N/A N/A 22 N/A <0.05
N/A <1 N/A N/A 3.4 N/A <5 N/A N/A N/A <0.005 N/A 2000 N/A <1 N/A N/A N/A 246 N/A <0.05
N/A <1 N/A N/A 2.6 N/A <5 N/A N/A N/A <0.005 N/A 282 N/A <1 N/A N/A N/A 116 N/A <0.05
N/A <1 N/A 13.1 2.9 N/A <5 N/A N/A N/A <0.005 N/A 75 N/A <1 N/A 8.05 N/A 38 N/A <0.05
N/A <1 N/A 14.8 3.3 N/A <5 N/A N/A N/A <0.005 N/A 849 N/A <1 N/A 10 N/A 62 N/A <0.05
<1 <1 11.5 12.2 2.9 <5 <5 N/A N/A <0.005 0.007 52 4730 <1 <1 6.97 8.42 <5 152 <0.05 <0.05
N/A <1 N/A 10.7 2.9 N/A 6 N/A N/A N/A 0.011 N/A 7610 N/A <1 N/A 7.66 N/A 127 N/A <0.05
N/A <1 N/A 12.6 3 N/A <5 N/A N/A N/A 0.009 N/A 6550 N/A <1 N/A 8.37 N/A 225 N/A <0.05
N/A <1 N/A 12.5 3.2 N/A <5 N/A N/A N/A <0.005 N/A 679 N/A <1 N/A 7.45 N/A 27 N/A <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 N/A N/A N/A N/A
N/A <1 N/A N/A 6.4 N/A <5 N/A N/A N/A <0.005 N/A 370 N/A <1 N/A N/A N/A 18 N/A <0.05
N/A <1 N/A N/A 6.3 N/A <5 N/A N/A N/A <0.005 N/A 52 N/A <1 N/A N/A N/A <5 N/A <0.05
N/A <1 N/A N/A 6.6 N/A <5 N/A N/A N/A <0.005 N/A 41 N/A <1 N/A N/A N/A <5 N/A <0.05
N/A <1 N/A N/A 6.4 N/A <5 N/A N/A N/A <0.005 N/A 79 N/A <1 N/A N/A N/A <5 N/A <0.05
N/A <1 N/A N/A 5.6 N/A <5 N/A N/A N/A <0.005 N/A 46 N/A <1 N/A N/A N/A <5 N/A <0.05
N/A <1 N/A 19.1 6.5 N/A <5 N/A N/A N/A <0.005 N/A 103 N/A <1 N/A 6.44 N/A 5 N/A <0.05
N/A <1 N/A 19 6.7 N/A <5 N/A N/A N/A <0.005 N/A 10 N/A <1 N/A 6.29 N/A <5 N/A <0.05
<1 <1 20.1 20.5 6.9 <5 <5 N/A N/A <0.005 <0.005 <10 37 <1 <1 6.64 6.78 <5 <5 <0.05 <0.05
N/A <1 N/A 21.2 7 N/A <5 N/A N/A N/A <0.005 N/A 91 N/A <1 N/A 7.03 N/A <5 N/A <0.05
N/A <1 N/A 23 6.9 N/A <5 N/A N/A N/A <0.005 N/A 120 N/A <1 N/A 7.31 N/A <5 N/A <0.05
N/A <1 N/A 24.5 7.3 N/A <5 N/A N/A N/A <0.005 N/A 35 N/A <1 N/A 7.69 N/A <5 N/A <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 N/A N/A N/A N/A
N/A <1 N/A N/A 6.2 N/A <5 N/A N/A N/A <0.005 N/A 584 N/A <1 N/A N/A N/A 63 N/A <0.05
N/A <1 N/A N/A 6.1 N/A <5 N/A N/A N/A <0.005 N/A 366 N/A <1 N/A N/A N/A 88 N/A <0.05
N/A <1 N/A N/A 6.6 N/A <5 N/A N/A N/A <0.005 N/A 227 N/A <1 N/A N/A N/A 55 N/A <0.05
N/A <1 N/A N/A 5.8 N/A <5 N/A N/A N/A <0.005 N/A 70 N/A <1 N/A N/A N/A 45 N/A <0.05
N/A <1 N/A N/A 5.2 N/A <5 N/A N/A N/A <0.005 N/A 190 N/A <1 N/A N/A N/A 45 N/A <0.05
N/A <1 N/A 19 6.2 N/A <5 N/A N/A N/A <0.005 N/A 195 N/A <1 N/A 6.89 N/A 38 N/A <0.05
N/A <1 N/A 19.1 6.2 N/A <5 N/A N/A N/A <0.005 N/A 75 N/A <1 N/A 6.92 N/A 22 N/A <0.05
<1 <1 21 21.4 7.3 <5 <5 N/A N/A <0.005 <0.005 <10 26 <1 <1 7.34 7.55 19 27 <0.05 <0.05
N/A <1 N/A 22.4 6.8 N/A <5 N/A N/A N/A <0.005 N/A 147 N/A <1 N/A 7.84 N/A 22 N/A <0.05
N/A <1 N/A 23.8 6 N/A <5 N/A N/A N/A <0.005 N/A 443 N/A <1 N/A 8.44 N/A 29 N/A <0.05
N/A <1 N/A 24.8 6.7 N/A <5 N/A N/A N/A <0.005 N/A 24 N/A <1 N/A 8.15 N/A 9 N/A <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 N/A N/A N/A N/A
Tables - Page 16
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection
Date
MW-10D Compliance Partially Weathered 3/8/2011
MW-10D Compliance Partially Weathered 7/5/2011
MW-10D Compliance Partially Weathered 11/2/2011
MW-10D Compliance Partially Weathered 3/7/2012
MW-10D Compliance Partially Weathered 7/3/2012
MW-10D Compliance Partially Weathered 11/7/2012
MW-10D Compliance Partially Weathered 3/6/2013
MW-10D Compliance Partially Weathered 7/8/2013
MW-10D Compliance Partially Weathered 11/5/2013
MW-10D Compliance Partially Weathered 3/4/2014
MW-10D Compliance Partially Weathered 7/1/2014
MW-10D Compliance Partially Weathered 11/3/2014
MW-11D Compliance Bedrock 3/7/2011
MW-11D Compliance Bedrock 7/5/2011
MW-11D Compliance Bedrock 11/2/2011
MW-11D Compliance Bedrock 3/7/2012
MW-11D Compliance Bedrock 7/3/2012
MW-11D Compliance Bedrock 11/7/2012
MW-11D Compliance Bedrock 3/7/2013
MW-11D Compliance Bedrock 7/9/2013
MW-11D Compliance Bedrock 11/5/2013
MW-11D Compliance Bedrock 3/4/2014
MW-11D Compliance Bedrock 7/1/2014
MW-11D Compliance Bedrock 11/3/2014
MW-11S Compliance Transition (Saprolite)3/7/2011
MW-11S Compliance Transition (Saprolite)7/5/2011
MW-11S Compliance Transition (Saprolite)11/2/2011
MW-11S Compliance Transition (Saprolite)3/7/2012
MW-11S Compliance Transition (Saprolite)7/3/2012
MW-11S Compliance Transition (Saprolite)11/7/2012
MW-11S Compliance Transition (Saprolite)3/7/2013
MW-11S Compliance Transition (Saprolite)7/9/2013
MW-11S Compliance Transition (Saprolite)11/5/2013
MW-11S Compliance Transition (Saprolite)3/4/2014
MW-11S Compliance Transition (Saprolite)7/1/2014
MW-11S Compliance Transition (Saprolite)11/3/2014
MW-12D Compliance Bedrock 3/8/2011
MW-12D Compliance Bedrock 7/5/2011
MW-12D Compliance Bedrock 11/2/2011
MW-12D Compliance Bedrock 3/7/2012
MW-12D Compliance Bedrock 7/3/2012
MW-12D Compliance Bedrock 11/7/2012
MW-12D Compliance Bedrock 3/7/2013
MW-12D Compliance Bedrock 7/9/2013
MW-12D Compliance Bedrock 11/4/2013
MW-12D Compliance Bedrock 3/4/2014
MW-12D Compliance Bedrock 7/1/2014
Analytical Parameter
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
Nitrate as N Strontium Sulfate TDS TOC TSS
mg-N/L N/A mg/L mg/L mg/L mg/L
10 NE 250 500 NE NE
300.0 N/A 300.0 2540C 5310B 2450D
Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Total Total Total Dissolved Total Total Total Dissolved Total
N/A N/A N/A <5 0.88 N/A N/A N/A <1 N/A N/A N/A 340 570 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 1 N/A N/A N/A <1 N/A N/A N/A 320 490 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.9 N/A N/A N/A <1 N/A N/A N/A 350 600 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.98 N/A N/A N/A <1 N/A N/A N/A 330 561 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 1 N/A N/A N/A <1 N/A N/A N/A 340 604 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.87 N/A 3.72 N/A <1 N/A 13.5 N/A 340 580 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.93 N/A 3.81 N/A <1 N/A 13.2 N/A 350 630 N/A <0.2 N/A N/A N/A <0.005
N/A N/A <5 <5 1 3.62 3.68 <1 <1 13.8 14 N/A 380 660 <0.2 <0.2 N/A <5 <0.005 <0.005
N/A N/A N/A <5 1.1 N/A 3.52 N/A <1 N/A 12.8 N/A 370 640 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 1.2 N/A 4.09 N/A <1 N/A 14.1 N/A 360 640 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 1.3 N/A 3.6 N/A <1 N/A 13.2 N/A 390 650 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 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 <0.1 N/A N/A N/A <1 N/A N/A N/A 3.6 140 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 39 160 N/A <0.2 N/A N/A N/A 0.005
N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 36 160 N/A <0.2 N/A N/A N/A 0.006
N/A N/A N/A <5 0.04 N/A N/A N/A <1 N/A N/A N/A 34 151 N/A <0.2 N/A N/A N/A 0.01
N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 35 <250 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 <0.023 N/A 1.8 N/A <1 N/A 12.5 N/A 33 190 N/A <0.2 N/A N/A N/A 0.009
N/A N/A N/A <5 0.03 N/A 2.17 N/A <1 N/A 11.6 N/A 33 240 N/A <0.2 N/A N/A N/A 0.017
N/A N/A <5 <5 <0.023 1.42 2.1 <1 <1 12.4 12.6 N/A 35 170 <0.2 <0.2 N/A 420 <0.005 0.019
N/A N/A N/A <5 <0.023 N/A 1.77 N/A <1 N/A 12.8 N/A 33 180 N/A <0.2 N/A N/A N/A 0.009
N/A N/A N/A <5 <0.023 N/A 1.69 N/A <1 N/A 12.9 N/A 32 160 N/A <0.2 N/A N/A N/A 0.011
N/A N/A N/A 8 <0.023 N/A 2.88 N/A <1 N/A 13.5 N/A 34 180 N/A <0.2 N/A N/A N/A 0.028
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 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 <0.1 N/A N/A N/A <1 N/A N/A N/A 23 120 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 22 120 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 22 130 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 <0.02 N/A N/A N/A <1 N/A N/A N/A 17 122 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 <0.023 N/A N/A N/A <1 N/A N/A N/A 20 <250 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 <0.023 N/A 0.569 N/A <1 N/A 14.7 N/A 20 120 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 <0.023 N/A 0.508 N/A <1 N/A 13.6 N/A 20 130 N/A <0.2 N/A N/A N/A <0.005
N/A N/A <5 <5 <0.023 0.499 0.568 <1 <1 14.9 15.1 N/A 22 140 <0.2 <0.2 N/A <5 <0.005 <0.005
N/A N/A N/A <5 <0.023 N/A 0.576 N/A <1 N/A 15.7 N/A 21 130 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 <0.023 N/A 0.772 N/A <1 N/A 15.7 N/A 21 150 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 <0.023 N/A 0.486 N/A <1 N/A 14.6 N/A 23 130 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 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 0.91 N/A N/A N/A <1 N/A N/A N/A 1.9 81 N/A <0.2 N/A N/A N/A 0.007
N/A N/A N/A <5 0.93 N/A N/A N/A <1 N/A N/A N/A 1.1 80 N/A <0.2 N/A N/A N/A 0.005
N/A N/A N/A <5 0.89 N/A N/A N/A <1 N/A N/A N/A 1.1 76 N/A <0.2 N/A N/A N/A 0.01
N/A N/A N/A <5 0.89 N/A N/A N/A <1 N/A N/A N/A 0.62 85 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.9 N/A N/A N/A <1 N/A N/A N/A 0.48 <250 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.86 N/A 1.24 N/A <1 N/A 5.65 N/A 0.46 82 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.88 N/A 1.09 N/A <1 N/A 5.12 N/A 0.39 74 N/A <0.2 N/A N/A N/A <0.005
N/A N/A <5 <5 0.89 1.04 1.17 <1 <1 5.33 5.52 N/A 0.38 90 <0.2 <0.2 N/A 12 <0.005 <0.005
N/A N/A N/A <5 0.86 N/A 1.08 N/A <1 N/A 5.36 N/A 0.35 83 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.87 N/A 1.19 N/A <1 N/A 5.29 N/A 0.3 79 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.89 N/A 1.14 N/A <1 N/A 5.54 N/A 0.3 79 N/A <0.2 N/A N/A N/A <0.005
Zinc
mg/L
Molydenum
µg/L
NE
200.8
Selenium
200.7
100
200.7 200.8
Nickel
µg/L
1
200.7 200.8 200.7
Sodium Thallium
mg/L µg/L
NE 0.2*NE 20
mg/L µg/L
Potassium
Tables - Page 17
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection
Date
Analytical Parameter
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
MW-12D Compliance Bedrock 11/3/2014
MW-12S Compliance Transition (Saprolite)3/8/2011
MW-12S Compliance Transition (Saprolite)7/5/2011
MW-12S Compliance Transition (Saprolite)11/2/2011
MW-12S Compliance Transition (Saprolite)3/7/2012
MW-12S Compliance Transition (Saprolite)7/3/2012
MW-12S Compliance Transition (Saprolite)11/7/2012
MW-12S Compliance Transition (Saprolite)3/7/2013
MW-12S Compliance Transition (Saprolite)7/9/2013
MW-12S Compliance Transition (Saprolite)11/4/2013
MW-12S Compliance Transition (Saprolite)3/4/2014
MW-12S Compliance Transition (Saprolite)7/1/2014
MW-12S Compliance Transition (Saprolite)11/3/2014
MW-13D Compliance Bedrock 3/8/2011
MW-13D Compliance Bedrock 7/5/2011
MW-13D Compliance Bedrock 11/2/2011
MW-13D Compliance Bedrock 3/7/2012
MW-13D Compliance Bedrock 7/3/2012
MW-13D Compliance Bedrock 11/7/2012
MW-13D Compliance Bedrock 3/6/2013
MW-13D Compliance Bedrock 7/8/2013
MW-13D Compliance Bedrock 11/4/2013
MW-13D Compliance Bedrock 3/3/2014
MW-13D Compliance Bedrock 7/1/2014
MW-13D Compliance Bedrock 11/3/2014
MW-1D Voluntary Bedrock 11/15/2006
MW-1D Voluntary Bedrock 5/15/2007
MW-1D Voluntary Bedrock 11/19/2007
MW-1D Voluntary Bedrock 5/21/2008
MW-1D Voluntary Bedrock 11/24/2008
MW-1D Voluntary Bedrock 5/12/2009
MW-1D Voluntary Bedrock 11/2/2009
MW-1D Voluntary Bedrock 5/25/2010
MW-1D Voluntary Bedrock 11/4/2013
MW-1S Voluntary Transition (Saprolite)11/15/2006
MW-1S Voluntary Transition (Saprolite)5/15/2007
MW-1S Voluntary Transition (Saprolite)11/19/2007
MW-1S Voluntary Transition (Saprolite)5/21/2008
MW-1S Voluntary Transition (Saprolite)11/24/2008
MW-1S Voluntary Transition (Saprolite)11/25/2008
MW-1S Voluntary Transition (Saprolite)5/12/2009
MW-1S Voluntary Transition (Saprolite)11/2/2009
MW-1S Voluntary Transition (Saprolite)5/25/2010
MW-1S Voluntary Transition (Saprolite)3/8/2011
MW-1S Voluntary Transition (Saprolite)7/5/2011
MW-1S Voluntary Transition (Saprolite)11/2/2011
MW-1S Voluntary Transition (Saprolite)11/4/2013
Nitrate as N Strontium Sulfate TDS TOC TSS
mg-N/L N/A mg/L mg/L mg/L mg/L
10 NE 250 500 NE NE
300.0 N/A 300.0 2540C 5310B 2450D
Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Total Total Total Dissolved Total Total Total Dissolved Total
Zinc
mg/L
Molydenum
µg/L
NE
200.8
Selenium
200.7
100
200.7 200.8
Nickel
µg/L
1
200.7 200.8 200.7
Sodium Thallium
mg/L µg/L
NE 0.2*NE 20
mg/L µg/L
Potassium
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 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 0.62 N/A N/A N/A <1 N/A N/A N/A 15 110 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.63 N/A N/A N/A <1 N/A N/A N/A 4 87 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.59 N/A N/A N/A <1 N/A N/A N/A 5.1 110 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.71 N/A N/A N/A <1 N/A N/A N/A 1.4 98 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.76 N/A N/A N/A <1 N/A N/A N/A 0.66 <250 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.66 N/A 0.857 N/A <1 N/A 7.61 N/A 0.68 94 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.36 N/A 0.731 N/A <1 N/A 9.79 N/A 2.4 100 N/A <0.2 N/A N/A N/A <0.005
N/A N/A <5 <5 0.7 0.669 0.75 <1 <1 7.94 8.37 N/A 0.58 110 <0.2 <0.2 N/A 5 <0.005 <0.005
N/A N/A N/A <5 0.7 N/A 0.792 N/A <1 N/A 8.96 N/A 0.5 110 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.77 N/A 0.685 N/A <1 N/A 7.69 N/A 0.38 95 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.83 N/A 0.694 N/A <1 N/A 7.28 N/A 0.18 89 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 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 2.1 N/A N/A N/A <1 N/A N/A N/A 3.2 130 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 2.5 N/A N/A N/A <1 N/A N/A N/A 2.5 140 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 2 N/A N/A N/A <1 N/A N/A N/A 2.2 140 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 1.9 N/A N/A N/A <1 N/A N/A N/A 2.1 126 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 2.5 N/A N/A N/A <1 N/A N/A N/A 2.2 <250 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 2 N/A 1.65 N/A <1 N/A 8.06 N/A 2.1 130 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 1.9 N/A 1.59 N/A <1 N/A 7.47 N/A 2 140 N/A <0.2 N/A N/A N/A <0.005
N/A N/A <5 <5 2.2 1.62 1.7 <1 <1 8.04 8.12 N/A 2.3 150 <0.2 <0.2 N/A 6 <0.005 <0.005
N/A N/A N/A <5 2.3 N/A 1.64 N/A <1 N/A 8.14 N/A 2.2 140 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 1.9 N/A 1.76 N/A <1 N/A 8.31 N/A 2.2 140 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 2.6 N/A 1.83 N/A <1 N/A 9 N/A 2.3 150 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A <2 0.19 N/A 1.64 N/A <2 N/A 11.431 N/A 25.79 270 N/A N/A 0.51 N/A N/A <0.005
N/A N/A N/A 2 0.17 N/A 1.87 N/A <2 N/A 11.892 N/A 29.87 268 N/A N/A 0.48 N/A N/A 0.014
N/A N/A N/A <2 0.09 N/A 1.79 N/A <2 N/A 11 N/A 36.99 258 N/A N/A 0.577 N/A N/A <0.005
N/A N/A N/A <2 0.15 N/A 1.8 N/A <2 N/A 11 N/A 36 160 N/A N/A 0.66 N/A N/A <0.005
N/A N/A N/A <2 <0.23 N/A 1.76 N/A <2 N/A 11 N/A 40 260 N/A N/A 0.43 N/A N/A <0.005
N/A N/A N/A <1 0.43 N/A 1.81 N/A <1 N/A 11 N/A 28 248 N/A N/A 0.412 N/A N/A <0.005
N/A N/A N/A <1 0.54 N/A 1.76 N/A <1 N/A 10.9 N/A 28 254 N/A N/A 0.451 N/A N/A <0.005
N/A N/A N/A <1 1.06 N/A 1.71 N/A <1 N/A 10.3 N/A 19 208 N/A N/A 0.273 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 3.86 0.77 N/A 1.06 N/A <2 N/A 17.048 N/A 23.62 270 N/A N/A 0.77 N/A N/A 0.019
N/A N/A N/A 4.55 0.52 N/A 0.81 N/A <2 N/A 15.638 N/A 27.3 380 N/A N/A 0.8 N/A N/A 0.016
N/A N/A N/A 3.19 0.41 N/A 0.67 N/A <2 N/A 15.2 N/A 33.67 289 N/A N/A 0.663 N/A N/A 0.008
N/A N/A N/A 3.42 0.67 N/A 0.77 N/A <2 N/A 14.7 N/A 32 160 N/A N/A 0.85 N/A N/A 0.013
N/A N/A N/A 2.86 0.6 N/A 0.58 N/A <2 N/A 14.4 N/A 37 254 N/A N/A 2.31 N/A N/A 0.007
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A <1 1.91 N/A 0.49 N/A <1 N/A 13.6 N/A 12 220 N/A N/A 0.508 N/A N/A 0.008
N/A N/A N/A 1 1.71 N/A 0.47 N/A <1 N/A 14 N/A 15 248 N/A N/A 0.559 N/A N/A <0.005
N/A N/A N/A 1.19 2.25 N/A 0.456 N/A <1 N/A 13.5 N/A 7.9 219 N/A N/A 0.424 N/A N/A <0.005
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Tables - Page 18
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection
Date
Analytical Parameter
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
MW-2D Voluntary Bedrock 11/15/2006
MW-2D Voluntary Bedrock 5/16/2007
MW-2D Voluntary Bedrock 11/19/2007
MW-2D Voluntary Bedrock 5/21/2008
MW-2S Voluntary Transition (Saprolite)11/15/2006
MW-2S Voluntary Transition (Saprolite)5/16/2007
MW-2S Voluntary Transition (Saprolite)11/19/2007
MW-2S Voluntary Transition (Saprolite)5/21/2008
MW-3D Voluntary Bedrock 11/15/2006
MW-3D Voluntary Bedrock 5/15/2007
MW-3D Voluntary Bedrock 11/19/2007
MW-3D Voluntary Bedrock 5/21/2008
MW-3D Voluntary Bedrock 11/24/2008
MW-3D Voluntary Bedrock 5/12/2009
MW-3D Voluntary Bedrock 11/2/2009
MW-3D Voluntary Bedrock 5/25/2010
MW-3D Voluntary Bedrock 11/4/2013
MW-3S Voluntary Transition (Saprolite)11/15/2006
MW-3S Voluntary Transition (Saprolite)5/15/2007
MW-3S Voluntary Transition (Saprolite)11/19/2007
MW-3S Voluntary Transition (Saprolite)5/21/2008
MW-3S Voluntary Transition (Saprolite)11/24/2008
MW-3S Voluntary Transition (Saprolite)5/12/2009
MW-3S Voluntary Transition (Saprolite)11/2/2009
MW-3S Voluntary Transition (Saprolite)5/25/2010
MW-3S Voluntary Transition (Saprolite)3/7/2011
MW-3S Voluntary Transition (Saprolite)7/5/2011
MW-3S Voluntary Transition (Saprolite)11/2/2011
MW-3S Voluntary Transition (Saprolite)11/4/2013
MW-4D Voluntary Bedrock 11/14/2006
MW-4D Voluntary Bedrock 5/15/2007
MW-4D Voluntary Bedrock 11/19/2007
MW-4D Voluntary Bedrock 5/21/2008
MW-4D Voluntary Bedrock 11/24/2008
MW-4D Voluntary Bedrock 5/12/2009
MW-4D Voluntary Bedrock 11/2/2009
MW-4D Voluntary Bedrock 5/25/2010
MW-4D Voluntary Bedrock 11/4/2013
MW-4S Voluntary Transition (Saprolite)11/14/2006
MW-4S Voluntary Transition (Saprolite)5/15/2007
MW-4S Voluntary Transition (Saprolite)11/19/2007
MW-4S Voluntary Transition (Saprolite)5/21/2008
MW-4S Voluntary Transition (Saprolite)11/24/2008
MW-4S Voluntary Transition (Saprolite)5/12/2009
MW-4S Voluntary Transition (Saprolite)11/2/2009
MW-4S Voluntary Transition (Saprolite)5/25/2010
MW-4S Voluntary Transition (Saprolite)3/7/2011
Nitrate as N Strontium Sulfate TDS TOC TSS
mg-N/L N/A mg/L mg/L mg/L mg/L
10 NE 250 500 NE NE
300.0 N/A 300.0 2540C 5310B 2450D
Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Total Total Total Dissolved Total Total Total Dissolved Total
Zinc
mg/L
Molydenum
µg/L
NE
200.8
Selenium
200.7
100
200.7 200.8
Nickel
µg/L
1
200.7 200.8 200.7
Sodium Thallium
mg/L µg/L
NE 0.2*NE 20
mg/L µg/L
Potassium
N/A N/A N/A 7.2 0.53 N/A 3.24 N/A <2 N/A 9.518 N/A 37.63 160 N/A N/A 0.2 N/A N/A 0.038
N/A N/A N/A 3.24 0.45 N/A 1.52 N/A <2 N/A 8.979 N/A 33.92 168 N/A N/A 0.2 N/A N/A 0.006
N/A N/A N/A <2 0.35 N/A 1.22 N/A <2 N/A 9.18 N/A 53.98 165 N/A N/A 0.177 N/A N/A <0.005
N/A N/A N/A <2 0.39 N/A 1.17 N/A <2 N/A 8.97 N/A 51 38 N/A N/A 0.2 N/A N/A <0.005
N/A N/A N/A 2.64 <0.02 N/A 0.31 N/A <2 N/A 10.13 N/A 85.69 160 N/A N/A 0.43 N/A N/A 0.023
N/A N/A N/A 2.93 0.02 N/A 0.44 N/A <2 N/A 10.192 N/A 94.76 184 N/A N/A 0.41 N/A N/A 0.015
N/A N/A N/A 3.71 <0.02 N/A 0.46 N/A <2 N/A 9.1 N/A 94.63 154 N/A N/A 0.462 N/A N/A 0.013
N/A N/A N/A 2.81 <0.02 N/A 0.41 N/A <2 N/A 9.43 N/A 84 160 N/A N/A 0.44 N/A N/A 0.016
N/A N/A N/A <2 <0.02 N/A 2.65 N/A <2 N/A 14.475 N/A 106.07 250 N/A N/A 0.29 N/A N/A 0.006
N/A N/A N/A 2 <0.02 N/A 2.69 N/A <2 N/A 14.234 N/A 114 268 N/A N/A 0.29 N/A N/A <0.005
N/A N/A N/A <2 <0.02 N/A 2.49 N/A <2 N/A 13.4 N/A 105.48 237 N/A N/A 0.299 N/A N/A <0.005
N/A N/A N/A <2 <0.02 N/A 2.52 N/A <2 N/A 14.2 N/A 100 110 N/A N/A 0.39 N/A N/A <0.005
N/A N/A N/A <2 <0.23 N/A 2.32 N/A <2 N/A 13 N/A 94 220 N/A N/A 0.272 N/A N/A <0.005
N/A N/A N/A <1 <0.02 N/A 2.46 N/A <1 N/A 14 N/A 88 202 N/A N/A 0.306 N/A N/A <0.005
N/A N/A N/A <1 <0.02 N/A 2.46 N/A <1 N/A 13.9 N/A 81 224 N/A N/A 0.373 N/A N/A <0.005
N/A N/A N/A <1 <0.02 N/A 2.29 N/A <1 N/A 13.1 N/A 81 187 N/A N/A 0.174 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 <2 <0.02 N/A 0.79 N/A <2 N/A 15.46 N/A 64.93 130 N/A N/A 0.33 N/A N/A <0.005
N/A N/A N/A 2.21 <0.02 N/A 0.91 N/A <2 N/A 15.112 N/A 71.71 152 N/A N/A 0.31 N/A N/A <0.005
N/A N/A N/A <2 <0.02 N/A 0.88 N/A <2 N/A 15.1 N/A 65.83 114 N/A N/A 0.329 N/A N/A <0.005
N/A N/A N/A <2 <0.02 N/A 0.8 N/A <2 N/A 14.9 N/A 61 66 N/A N/A 0.38 N/A N/A <0.005
N/A N/A N/A <2 <0.23 N/A 0.86 N/A <2 N/A 14.6 N/A 57 114 N/A N/A 0.332 N/A N/A <0.005
N/A N/A N/A 1.1 0.04 N/A 0.85 N/A <1 N/A 14.7 N/A 55 108 N/A N/A 0.299 N/A N/A <0.005
N/A N/A N/A 1.3 <0.02 N/A 0.856 N/A <1 N/A 15.3 N/A 52 130 N/A N/A 0.314 N/A N/A <0.005
N/A N/A N/A 1.28 <0.02 N/A 0.757 N/A <1 N/A 13.8 N/A 53 86 N/A N/A 0.208 N/A N/A <0.005
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A <2 <0.02 N/A 1.27 N/A <2 N/A 12.532 N/A 30.41 140 N/A N/A 0.27 N/A N/A <0.005
N/A N/A N/A 2 <0.02 N/A 1.36 N/A <2 N/A 12.256 N/A 30.4 158 N/A N/A 0.29 N/A N/A <0.005
N/A N/A N/A <2 <0.02 N/A 1.24 N/A <2 N/A 11.5 N/A 30.41 118 N/A N/A 0.426 N/A N/A <0.005
N/A N/A N/A <2 <0.02 N/A 1.24 N/A <2 N/A 11.7 N/A 28 14 N/A N/A 0.32 N/A N/A <0.005
N/A N/A N/A <2 <0.23 N/A 1.18 N/A <2 N/A 11.2 N/A 29 72 N/A N/A 0.258 N/A N/A <0.005
N/A N/A N/A <1 <0.02 N/A 1.33 N/A <1 N/A 12.1 N/A 29 114 N/A N/A 0.3 N/A N/A <0.005
N/A N/A N/A <1 <0.02 N/A 1.29 N/A <1 N/A 12 N/A 28 150 N/A N/A 0.311 N/A N/A <0.005
N/A N/A N/A <1 <0.02 N/A 1.19 N/A <1 N/A 11.4 N/A 28 124 N/A N/A 0.156 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 <2 <0.02 N/A 1.51 N/A <2 N/A 14.984 N/A 25.35 110 N/A N/A 0.26 N/A N/A <0.005
N/A N/A N/A 2 <0.02 N/A 1.4 N/A <2 N/A 14.262 N/A 24.37 152 N/A N/A 0.26 N/A N/A <0.005
N/A N/A N/A <2 <0.02 N/A 1.61 N/A <2 N/A 14 N/A 23.57 87 N/A N/A 0.234 N/A N/A <0.005
N/A N/A N/A <2 <0.02 N/A 3.61 N/A <2 N/A 14.7 N/A 22 140 N/A N/A 0.31 N/A N/A 0.019
N/A N/A N/A <2 <0.23 N/A 1.23 N/A <2 N/A 13.9 N/A 23 48 N/A N/A 0.216 N/A N/A <0.005
N/A N/A N/A <1 0.03 N/A 4.41 N/A <1 N/A 14.6 N/A 23 94 N/A N/A 0.511 N/A N/A 0.03
N/A N/A N/A <1 0.03 N/A 1.82 N/A <1 N/A 15.2 N/A 23 88 N/A N/A 0.282 N/A N/A <0.005
N/A N/A N/A <1 <0.02 N/A 1.43 N/A <1 N/A 14.3 N/A 22 87 N/A N/A 0.128 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
Tables - Page 19
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection
Date
Analytical Parameter
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
MW-4S Voluntary Transition (Saprolite)7/5/2011
MW-4S Voluntary Transition (Saprolite)11/2/2011
MW-4S Voluntary Transition (Saprolite)11/4/2013
MW-5D Voluntary Bedrock 11/15/2006
MW-5D Voluntary Bedrock 5/16/2007
MW-5D Voluntary Bedrock 11/20/2007
MW-5D Voluntary Bedrock 5/21/2008
MW-5D Voluntary Bedrock 11/24/2008
MW-5D Voluntary Bedrock 5/12/2009
MW-5D Voluntary Bedrock 11/2/2009
MW-5D Voluntary Bedrock 5/25/2010
MW-5D Voluntary Bedrock 11/4/2013
MW-5S Voluntary Transition (Saprolite)11/15/2006
MW-5S Voluntary Transition (Saprolite)5/16/2007
MW-5S Voluntary Transition (Saprolite)11/20/2007
MW-5S Voluntary Transition (Saprolite)5/21/2008
MW-5S Voluntary Transition (Saprolite)11/24/2008
MW-5S Voluntary Transition (Saprolite)5/12/2009
MW-5S Voluntary Transition (Saprolite)11/2/2009
MW-5S Voluntary Transition (Saprolite)5/25/2010
MW-5S Voluntary Transition (Saprolite)3/8/2011
MW-5S Voluntary Transition (Saprolite)7/5/2011
MW-5S Voluntary Transition (Saprolite)11/2/2011
MW-5S Voluntary Transition (Saprolite)11/4/2013
MW-6D Compliance Bedrock 11/14/2006
MW-6D Compliance Bedrock 5/15/2007
MW-6D Compliance Bedrock 11/20/2007
MW-6D Compliance Bedrock 5/21/2008
MW-6D Compliance Bedrock 11/24/2008
MW-6D Compliance Bedrock 5/12/2009
MW-6D Compliance Bedrock 11/2/2009
MW-6D Compliance Bedrock 5/25/2010
MW-6D Compliance Bedrock 3/7/2011
MW-6D Compliance Bedrock 7/5/2011
MW-6D Compliance Bedrock 11/2/2011
MW-6D Compliance Bedrock 3/7/2012
MW-6D Compliance Bedrock 7/3/2012
MW-6D Compliance Bedrock 11/7/2012
MW-6D Compliance Bedrock 3/6/2013
MW-6D Compliance Bedrock 7/8/2013
MW-6D Compliance Bedrock 11/4/2013
MW-6D Compliance Bedrock 3/3/2014
MW-6D Compliance Bedrock 7/1/2014
MW-6D Compliance Bedrock 11/3/2014
MW-6S Compliance Transition (Saprolite)11/14/2006
MW-6S Compliance Transition (Saprolite)5/15/2007
MW-6S Compliance Transition (Saprolite)11/20/2007
Nitrate as N Strontium Sulfate TDS TOC TSS
mg-N/L N/A mg/L mg/L mg/L mg/L
10 NE 250 500 NE NE
300.0 N/A 300.0 2540C 5310B 2450D
Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Total Total Total Dissolved Total Total Total Dissolved Total
Zinc
mg/L
Molydenum
µg/L
NE
200.8
Selenium
200.7
100
200.7 200.8
Nickel
µg/L
1
200.7 200.8 200.7
Sodium Thallium
mg/L µg/L
NE 0.2*NE 20
mg/L µg/L
Potassium
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A <2 0.02 N/A 2.25 N/A <2 N/A 12.69 N/A 25.49 130 N/A N/A 0.34 N/A N/A <0.005
N/A N/A N/A 2 0.02 N/A 2.43 N/A <2 N/A 12.799 N/A 25.11 168 N/A N/A 0.3 N/A N/A <0.005
N/A N/A N/A <2 <0.02 N/A 2.52 N/A <2 N/A 12 N/A 23.66 113 N/A N/A 0.318 N/A N/A <0.005
N/A N/A N/A <2 0.02 N/A 2.35 N/A <2 N/A 12.6 N/A 23 130 N/A N/A 0.41 N/A N/A <0.005
N/A N/A N/A <2 <0.23 N/A 1.71 N/A <2 N/A 12.2 N/A 21 68 N/A N/A 0.335 N/A N/A <0.005
N/A N/A N/A <1 <0.02 N/A 1.85 N/A <1 N/A 13.4 N/A 21 134 N/A N/A 0.396 N/A N/A <0.005
N/A N/A N/A <1 0.02 N/A 1.82 N/A <1 N/A 13.7 N/A 22 142 N/A N/A 0.332 N/A N/A <0.005
N/A N/A N/A <1 <0.02 N/A 1.71 N/A <1 N/A 12.8 N/A 22 113 N/A N/A 0.194 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 <2 0.04 N/A 1.31 N/A <2 N/A 17.173 N/A 28.9 90 N/A N/A 0.36 N/A N/A <0.005
N/A N/A N/A 2 0.16 N/A 1.33 N/A <2 N/A 17.486 N/A 30.57 106 N/A N/A 0.32 N/A N/A <0.005
N/A N/A N/A <2 <0.02 N/A 1.47 N/A <2 N/A 17.4 N/A 31.64 73 N/A N/A 0.351 N/A N/A 0.007
N/A N/A N/A <2 0.34 N/A 1.18 N/A <2 N/A 18.5 N/A 32 94 N/A N/A 0.3 N/A N/A <0.005
N/A N/A N/A <2 <0.23 N/A 1.14 N/A <2 N/A 18.5 N/A 35 40 N/A N/A 0.286 N/A N/A <0.005
N/A N/A N/A <1 0.14 N/A 1.15 N/A <1 N/A 19.1 N/A 36 54 N/A N/A 0.342 N/A N/A 0.006
N/A N/A N/A <1 0.05 N/A 1.21 N/A <1 N/A 19.1 N/A 35 110 N/A N/A 0.31 N/A N/A <0.005
N/A N/A N/A <1 0.1 N/A 0.993 N/A <1 N/A 17.3 N/A 36 66 N/A N/A 0.208 N/A N/A <0.005
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A 3.24 0.68 N/A 1.74 N/A <2 N/A 4.593 N/A 1.3 68 N/A N/A 0.11 N/A N/A 0.017
N/A N/A N/A 2 0.66 N/A 1.96 N/A <2 N/A 4.544 N/A 1.31 102 N/A N/A <0.1 N/A N/A 0.006
N/A N/A N/A <2 0.64 N/A 1.85 N/A <2 N/A 4.36 N/A 1.43 48 N/A N/A <0.1 N/A N/A <0.005
N/A N/A N/A <2 0.58 N/A 1.8 N/A <2 N/A 4.87 N/A 1.3 73 N/A N/A 0.11 N/A N/A <0.005
N/A N/A N/A <2 0.52 N/A 1.89 N/A <2 N/A 4.93 N/A 1.3 50 N/A N/A 0.127 N/A N/A <0.005
N/A N/A N/A <1 0.54 N/A 2.08 N/A <1 N/A 5.51 N/A 1.2 62 N/A N/A <0.1 N/A N/A <0.005
N/A N/A N/A <1 0.51 N/A 2.11 N/A <1 N/A 5.82 N/A 1.2 78 N/A N/A 0.121 N/A N/A <0.005
N/A N/A N/A <1 0.52 N/A 2 N/A <1 N/A 5.46 N/A 1.1 94 N/A N/A <0.1 N/A N/A <0.005
N/A N/A N/A <5 0.55 N/A N/A N/A <1 N/A N/A N/A 1.3 100 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.56 N/A N/A N/A <1 N/A N/A N/A 1.4 97 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.53 N/A N/A N/A <1 N/A N/A N/A 1.2 93 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.54 N/A N/A N/A <1 N/A N/A N/A 1.3 106 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.53 N/A N/A N/A <1 N/A N/A N/A 1.5 <250 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.49 N/A 2.1 N/A <1 N/A 5.86 N/A 1.4 110 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.49 N/A 2.15 N/A <1 N/A 5.63 N/A 1.4 120 N/A <0.2 N/A N/A N/A <0.005
N/A N/A <5 <5 0.51 2.29 2.37 <1 <1 6.1 6.21 N/A 1.6 140 <0.2 <0.2 N/A <5 <0.005 <0.005
N/A N/A N/A <5 0.48 N/A 2.31 N/A <1 N/A 6.08 N/A 1.5 120 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.52 N/A 2.36 N/A <1 N/A 6.24 N/A 0.17 120 N/A <0.2 N/A N/A N/A 0.007
N/A N/A N/A <5 0.48 N/A 2.5 N/A <1 N/A 6.14 N/A 1.8 110 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A 5.33 0.33 N/A 0.48 N/A <2 N/A 2.236 N/A 0.18 24 N/A N/A 0.3 N/A N/A 0.023
N/A N/A N/A 5.62 0.3 N/A 0.5 N/A <2 N/A 2.262 N/A 0.23 36 N/A N/A 0.15 N/A N/A 0.006
N/A N/A N/A 6.09 0.36 N/A 0.54 N/A <2 N/A 2.17 N/A 0.2 55 N/A N/A 0.228 N/A N/A 0.009
Tables - Page 20
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection
Date
Analytical Parameter
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
MW-6S Compliance Transition (Saprolite)5/21/2008
MW-6S Compliance Transition (Saprolite)11/24/2008
MW-6S Compliance Transition (Saprolite)5/12/2009
MW-6S Compliance Transition (Saprolite)11/2/2009
MW-6S Compliance Transition (Saprolite)5/25/2010
MW-6S Compliance Transition (Saprolite)3/7/2011
MW-6S Compliance Transition (Saprolite)7/5/2011
MW-6S Compliance Transition (Saprolite)11/2/2011
MW-6S Compliance Transition (Saprolite)3/7/2012
MW-6S Compliance Transition (Saprolite)7/3/2012
MW-6S Compliance Transition (Saprolite)11/7/2012
MW-6S Compliance Transition (Saprolite)3/6/2013
MW-6S Compliance Transition (Saprolite)7/8/2013
MW-6S Compliance Transition (Saprolite)11/4/2013
MW-6S Compliance Transition (Saprolite)3/3/2014
MW-6S Compliance Transition (Saprolite)7/1/2014
MW-6S Compliance Transition (Saprolite)11/3/2014
MW-7D Compliance Bedrock 3/8/2011
MW-7D Compliance Bedrock 7/5/2011
MW-7D Compliance Bedrock 11/2/2011
MW-7D Compliance Bedrock 3/7/2012
MW-7D Compliance Bedrock 7/3/2012
MW-7D Compliance Bedrock 11/7/2012
MW-7D Compliance Bedrock 3/6/2013
MW-7D Compliance Bedrock 7/8/2013
MW-7D Compliance Bedrock 11/4/2013
MW-7D Compliance Bedrock 3/3/2014
MW-7D Compliance Bedrock 7/1/2014
MW-7D Compliance Bedrock 11/3/2014
MW-7S Compliance Transition (Saprolite)3/8/2011
MW-7S Compliance Transition (Saprolite)7/5/2011
MW-7S Compliance Transition (Saprolite)11/2/2011
MW-7S Compliance Transition (Saprolite)3/7/2012
MW-7S Compliance Transition (Saprolite)7/3/2012
MW-7S Compliance Transition (Saprolite)11/7/2012
MW-7S Compliance Transition (Saprolite)3/6/2013
MW-7S Compliance Transition (Saprolite)7/8/2013
MW-7S Compliance Transition (Saprolite)11/4/2013
MW-7S Compliance Transition (Saprolite)3/3/2014
MW-7S Compliance Transition (Saprolite)7/1/2014
MW-7S Compliance Transition (Saprolite)11/3/2014
MW-8D Compliance Partially Weathered 3/7/2011
MW-8D Compliance Partially Weathered 7/5/2011
MW-8D Compliance Partially Weathered 11/2/2011
MW-8D Compliance Partially Weathered 3/7/2012
MW-8D Compliance Partially Weathered 7/3/2012
MW-8D Compliance Partially Weathered 11/7/2012
Nitrate as N Strontium Sulfate TDS TOC TSS
mg-N/L N/A mg/L mg/L mg/L mg/L
10 NE 250 500 NE NE
300.0 N/A 300.0 2540C 5310B 2450D
Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Total Total Total Dissolved Total Total Total Dissolved Total
Zinc
mg/L
Molydenum
µg/L
NE
200.8
Selenium
200.7
100
200.7 200.8
Nickel
µg/L
1
200.7 200.8 200.7
Sodium Thallium
mg/L µg/L
NE 0.2*NE 20
mg/L µg/L
Potassium
N/A N/A N/A 4.95 0.39 N/A 0.57 N/A <2 N/A 2.32 N/A 0.18 <10 N/A N/A 0.24 N/A N/A 0.012
N/A N/A N/A 5.2 0.26 N/A 0.51 N/A <2 N/A 2.23 N/A <1 <20 N/A N/A 0.64 N/A N/A 0.006
N/A N/A N/A 4.6 0.21 N/A 0.51 N/A <1 N/A 2.35 N/A 0.3 24 N/A N/A 0.212 N/A N/A 0.007
N/A N/A N/A 4.6 0.2 N/A 0.486 N/A <1 N/A 2.46 N/A 0.18 <20 N/A N/A 0.331 N/A N/A <0.005
N/A N/A N/A 6.58 <0.02 N/A 0.439 N/A <1 N/A 2.48 N/A <0.1 <25 N/A N/A 0.611 N/A N/A 0.006
N/A N/A N/A 7 <0.1 N/A N/A N/A <1 N/A N/A N/A 0.19 32 N/A <0.2 N/A N/A N/A 0.009
N/A N/A N/A 7 0.23 N/A N/A N/A <1 N/A N/A N/A 0.19 39 N/A <0.2 N/A N/A N/A 0.007
N/A N/A N/A 7 0.19 N/A N/A N/A <1 N/A N/A N/A 0.26 21 N/A <0.2 N/A N/A N/A 0.006
N/A N/A N/A 6 0.5 N/A N/A N/A <1 N/A N/A N/A 0.18 33 N/A <0.2 N/A N/A N/A 0.008
N/A N/A N/A 8 0.49 N/A N/A N/A <1 N/A N/A N/A 0.2 <250 N/A <0.2 N/A N/A N/A 0.007
N/A N/A N/A 7 0.38 N/A 0.532 N/A <1 N/A 2.63 N/A 0.2 38 N/A <0.2 N/A N/A N/A 0.007
N/A N/A N/A 7 0.4 N/A 0.512 N/A <1 N/A 2.57 N/A 0.21 47 N/A <0.2 N/A N/A N/A 0.008
N/A N/A 8 7 0.53 0.515 0.525 <1 <1 2.72 2.69 N/A 0.25 63 <0.2 <0.2 N/A <5 0.011 0.01
N/A N/A N/A 7 0.54 N/A 0.479 N/A <1 N/A 2.57 N/A 0.24 50 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A 7 0.51 N/A 0.511 N/A <1 N/A 2.57 N/A 0.16 36 N/A <0.2 N/A N/A N/A 0.014
N/A N/A N/A 6 0.3 N/A 0.498 N/A <1 N/A 2.38 N/A 0.14 32 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 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 0.32 N/A N/A N/A <1 N/A N/A N/A 32 170 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.33 N/A N/A N/A <1 N/A N/A N/A 14 130 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.44 N/A N/A N/A <1 N/A N/A N/A 5 160 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.37 N/A N/A N/A <1 N/A N/A N/A 8.1 110 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.49 N/A N/A N/A <1 N/A N/A N/A 4.3 <250 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.48 N/A 1.44 N/A <1 N/A 10.5 N/A 2.5 150 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.06 N/A 0.814 N/A <1 N/A 10.5 N/A 8.8 100 N/A <0.2 N/A N/A N/A <0.005
N/A N/A <5 <5 0.02 1.02 0.946 <1 <1 11.4 11.3 N/A 8.6 130 <0.2 <0.2 N/A 5 0.005 <0.005
N/A N/A N/A <5 0.53 N/A 1.3 N/A <1 N/A 10.4 N/A 2.1 120 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.05 N/A 0.7 N/A <1 N/A 11.7 N/A 6.7 110 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.44 N/A 0.924 N/A <1 N/A 10.4 N/A 2.7 110 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
N/A N/A N/A 6 0.14 N/A N/A N/A <1 N/A N/A N/A 3.4 95 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A 7 0.17 N/A N/A N/A <1 N/A N/A N/A 1.8 96 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A 7 0.15 N/A N/A N/A <1 N/A N/A N/A 2.4 110 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A 5 0.15 N/A N/A N/A <1 N/A N/A N/A 1.3 93 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A 6 0.15 N/A N/A N/A <1 N/A N/A N/A 0.94 <250 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A 7 0.09 N/A 0.17 N/A <1 N/A 3.93 N/A 2.4 96 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.11 N/A 0.12 N/A <1 N/A 3.12 N/A 2.4 100 N/A <0.2 N/A N/A N/A <0.005
N/A N/A <5 5 0.12 0.221 0.233 <1 <1 3.27 3.32 N/A 1.5 120 <0.2 <0.2 N/A <5 <0.005 <0.005
N/A N/A N/A 5 0.14 N/A <0.1 N/A <1 N/A 3.26 N/A 0.85 120 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A 6 0.16 N/A 0.105 N/A <1 N/A 3.35 N/A 0.85 98 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A 6 0.12 N/A 0.123 N/A <1 N/A 3.54 N/A 0.88 95 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 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 2.2 N/A N/A N/A <1 N/A N/A N/A 5.9 120 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 2.1 N/A N/A N/A <1 N/A N/A N/A 2.9 100 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 2.1 N/A N/A N/A <1 N/A N/A N/A 2.4 130 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 2.1 N/A N/A N/A <1 N/A N/A N/A 2.4 123 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 2.2 N/A N/A N/A <1 N/A N/A N/A 2.1 <250 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 2.1 N/A 1.42 N/A <1 N/A 7.24 N/A 2 120 N/A <0.2 N/A N/A N/A <0.005
Tables - Page 21
Table 4 - Groundwater Analytical Results
Analytical Method
Well Name Well Type Hydrostratigraphic Unit Sample Collection
Date
Analytical Parameter
15A NCAC 02L .0202(g) Groundwater Quality Standard
Units
MW-8D Compliance Partially Weathered 3/6/2013
MW-8D Compliance Partially Weathered 7/8/2013
MW-8D Compliance Partially Weathered 11/4/2013
MW-8D Compliance Partially Weathered 3/3/2014
MW-8D Compliance Partially Weathered 7/1/2014
MW-8D Compliance Partially Weathered 11/3/2014
MW-8S Compliance Transition (Saprolite)3/7/2011
MW-8S Compliance Transition (Saprolite)7/5/2011
MW-8S Compliance Transition (Saprolite)11/2/2011
MW-8S Compliance Transition (Saprolite)3/7/2012
MW-8S Compliance Transition (Saprolite)7/3/2012
MW-8S Compliance Transition (Saprolite)11/7/2012
MW-8S Compliance Transition (Saprolite)3/6/2013
MW-8S Compliance Transition (Saprolite)7/8/2013
MW-8S Compliance Transition (Saprolite)11/4/2013
MW-8S Compliance Transition (Saprolite)3/3/2014
MW-8S Compliance Transition (Saprolite)7/1/2014
MW-8S Compliance Transition (Saprolite)11/3/2014
MW-9D Compliance Bedrock 3/7/2011
MW-9D Compliance Bedrock 7/5/2011
MW-9D Compliance Bedrock 11/2/2011
MW-9D Compliance Bedrock 3/7/2012
MW-9D Compliance Bedrock 7/3/2012
MW-9D Compliance Bedrock 11/7/2012
MW-9D Compliance Bedrock 3/7/2013
MW-9D Compliance Bedrock 7/9/2013
MW-9D Compliance Bedrock 11/5/2013
MW-9D Compliance Bedrock 3/4/2014
MW-9D Compliance Bedrock 7/1/2014
MW-9D Compliance Bedrock 11/3/2014
MW-9S Compliance Transition (Saprolite)3/7/2011
MW-9S Compliance Transition (Saprolite)7/5/2011
MW-9S Compliance Transition (Saprolite)11/2/2011
MW-9S Compliance Transition (Saprolite)3/7/2012
MW-9S Compliance Transition (Saprolite)7/3/2012
MW-9S Compliance Transition (Saprolite)11/7/2012
MW-9S Compliance Transition (Saprolite)3/7/2013
MW-9S Compliance Transition (Saprolite)7/9/2013
MW-9S Compliance Transition (Saprolite)11/5/2013
MW-9S Compliance Transition (Saprolite)3/4/2014
MW-9S Compliance Transition (Saprolite)7/1/2014
MW-9S Compliance Transition (Saprolite)11/3/2014
Nitrate as N Strontium Sulfate TDS TOC TSS
mg-N/L N/A mg/L mg/L mg/L mg/L
10 NE 250 500 NE NE
300.0 N/A 300.0 2540C 5310B 2450D
Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Total Total Total Dissolved Total Total Total Dissolved Total
Zinc
mg/L
Molydenum
µg/L
NE
200.8
Selenium
200.7
100
200.7 200.8
Nickel
µg/L
1
200.7 200.8 200.7
Sodium Thallium
mg/L µg/L
NE 0.2*NE 20
mg/L µg/L
Potassium
N/A N/A N/A <5 2.1 N/A 1.35 N/A <1 N/A 6.72 N/A 2.1 120 N/A <0.2 N/A N/A N/A <0.005
N/A N/A <5 <5 2.2 1.4 1.45 <1 <1 7.22 7.37 N/A 2.1 130 <0.2 <0.2 N/A <5 <0.005 <0.005
N/A N/A N/A <5 2.1 N/A 1.34 N/A <1 N/A 6.98 N/A 1.8 120 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 2.2 N/A 1.46 N/A <1 N/A 7.38 N/A 2.1 110 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 2.2 N/A 1.38 N/A <1 N/A 7.14 N/A 2 120 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 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 0.71 N/A N/A N/A <1 N/A N/A N/A 12 150 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 1.2 N/A N/A N/A <1 N/A N/A N/A 3.7 120 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 1.1 N/A N/A N/A <1 N/A N/A N/A 3.2 150 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A 6 0.69 N/A N/A N/A <1 N/A N/A N/A 4.8 134 N/A <0.2 N/A N/A N/A 0.007
N/A N/A N/A <5 1.1 N/A N/A N/A <1 N/A N/A N/A 3 <250 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 1.1 N/A 0.972 N/A <1 N/A 8.16 N/A 2.7 140 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 1.2 N/A 0.925 N/A <1 N/A 7.38 N/A 7 150 N/A <0.2 N/A N/A N/A 0.007
N/A N/A <5 7 1.5 0.847 1.1 <1 <1 7.2 7.44 N/A 3.7 150 <0.2 <0.2 N/A 130 <0.005 0.011
N/A N/A N/A 10 1.6 N/A 1.2 N/A <1 N/A 7.24 N/A 1.7 130 N/A <0.2 N/A N/A N/A 0.009
N/A N/A N/A 9 1.5 N/A 1.2 N/A <1 N/A 7.58 N/A 2.9 130 N/A <0.2 N/A N/A N/A 0.011
N/A N/A N/A <5 1.4 N/A 0.986 N/A <1 N/A 7.69 N/A 2 130 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 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 0.19 N/A N/A N/A <1 N/A N/A N/A 10 160 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.19 N/A N/A N/A <1 N/A N/A N/A 8.8 140 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.17 N/A N/A N/A <1 N/A N/A N/A 9.2 170 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.17 N/A N/A N/A <1 N/A N/A N/A 9.1 157 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.17 N/A N/A N/A <1 N/A N/A N/A 9.3 <250 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.14 N/A 0.513 N/A <1 N/A 9.58 N/A 10 160 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.17 N/A 0.521 N/A <1 N/A 9.08 N/A 13 170 N/A <0.2 N/A N/A N/A <0.005
N/A N/A <5 <5 0.17 0.505 0.521 <1 <1 9.46 9.64 N/A 15 170 <0.2 <0.2 N/A <5 <0.005 <0.005
N/A N/A N/A <5 0.19 N/A 0.493 N/A <1 N/A 9.88 N/A 16 170 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.25 N/A 0.545 N/A <1 N/A 10.2 N/A 22 180 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.26 N/A 0.512 N/A <1 N/A 10.2 N/A 26 180 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 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 0.16 N/A N/A N/A <1 N/A N/A N/A 10 150 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.15 N/A N/A N/A <1 N/A N/A N/A 11 150 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.17 N/A N/A N/A <1 N/A N/A N/A 10 170 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.13 N/A N/A N/A <1 N/A N/A N/A 13 137 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.19 N/A N/A N/A <1 N/A N/A N/A 15 <250 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.19 N/A 0.26 N/A <1 N/A 9.38 N/A 14 150 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.19 N/A 0.192 N/A <1 N/A 7.98 N/A 18 170 N/A <0.2 N/A N/A N/A <0.005
N/A N/A <5 <5 0.27 0.233 0.226 <1 <1 9.24 9.54 N/A 25 190 <0.2 <0.2 N/A <5 <0.005 <0.005
N/A N/A N/A <5 0.37 N/A 0.255 N/A <1 N/A 9.89 N/A 26 180 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.41 N/A 0.208 N/A <1 N/A 8.94 N/A 30 180 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A <5 0.55 N/A 0.267 N/A <1 N/A 9.58 N/A 33 190 N/A <0.2 N/A N/A N/A <0.005
N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Tables - Page 22
Table 4 - Groundwater Analytical Results
Notes:1.Depth to Water measured from the top of well casing.
2.Analytical parameter abbreviations:
Temp. = Temperature
DO = Dissolved oxygen
Cond. = Specific conductivity
ORP = Oxidation reduction potential
TDS = Total dissolved solids
TSS = Total suspended solids
TOC = Total organic carbon
3.Units:
˚C = Degrees Celsius
SU = Standard Units
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
CO32- = carbonate
4.N/A = Not applicable
5.NE = Not established
6.* Interim Maximum Allowable Concentration (IMAC) standards
7.Highlighted values indicate values that exceed the 15A NCAC 2L Standard
8.Analytical results with "<" preceding the result indicates that the parameter was not detected at a concentration which attains or exceeds the laboratory reporting limit.
Tables - Page 23
Table 5 - Soil and Ash Analytical Results
pH Antimony Arsenic Barium Boron Cadmium Chromium Copper Iron Lead Manganese Mercury Nickel Selenium Thallium Zinc
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
NE 0.9 5.8 580 45 3 3.8 700 150 270 65 1 130 2.1 0.28 1,200
NE 82 2.4 38,000 40,000 160 6 8,200 100,000 800 4,600 3.1 4,000 1,000 2 62,000
Field 200.8 200.8 200.7 200.7 200.8 200.7 200.7 200.7 200.8 200.8 245.1 200.7 200.8 200.8 200.7
Sample Name and Depth Source Location Sample Collection Date
BC-11/12 (24-26')Ash Divider Dike Cell 2/3 10/[23-28]/13 8.9 <0.57 20.50 284.0 <5.7 <0.110 10.7 15.8 4,460 4.60 69.2 0.0900 7.10 2.00 <0.51 11.1
BC-11/12 (49-51')Ash Divider Dike Cell 2/3 10/[23-28]/13 9.8 0.96 47.20 336.0 10.8 <0.150 13.0 26.0 4,930 8.10 64.4 0.1100 9.60 2.90 <0.50 12.5
BC-15 (19-21')Ash Cell 2 10/[23-28]/13 6.7 0.72 35.70 249.0 14.2 0.110 13.4 51.4 5,720 14.50 73.0 0.0130 15.40 <1.10 0.57 29
BC-15 (34-36')Ash Cell 2 10/[23-28]/13 7.9 1.60 54.60 422.0 12.3 <0.120 11.9 46.4 6,320 11.50 119.0 0.0230 12.30 <1.20 <0.51 24.1
BC-17 (1-3')Ash Within Ash Storage Area (East of Cell 1)10/8/2013 6.0 0.87 25.60 210.0 9.7 <0.120 9.9 34.4 6,280 9.90 70.4 0.0190 11.80 2.10 <0.52 16.5
BC-17 (9-9.8')Ash Within Ash Storage Area (East of Cell 1)10/8/2013 6.5 0.95 201.00 288.0 <5.9 6.100 15.0 26.5 53,300 10.30 150.0 0.0440 18.90 10.10 <0.52 26.3
BC-18 (4-6')Ash Within Ash Storage Area (East of Cell 1)10/8/2013 6.8 1.20 22.50 241.0 11.4 <0.140 8.3 33.2 5,600 9.10 86.2 0.0160 10.90 2.50 <0.49 15.2
BC-18 (14-16')Ash Within Ash Storage Area (East of Cell 1)10/8/2013 6.5 0.99 11.70 166.0 19.6 <0.130 11.9 42.0 6,860 11.90 92.5 0.0210 14.50 2.70 <0.50 20.9
BC-19 (9-11')Ash Within Ash Storage Area (East of Cell 1)10/[7,17]/13 7.1 0.98 26.10 281.0 17 <0.130 9.5 39.4 4,920 10.80 43.0 0.0140 12.30 3.00 <0.48 17.9
BC-19 (14-16')Ash Within Ash Storage Area (East of Cell 1)10/[7,17]/13 7.5 1.00 16.40 164.0 11.7 <0.120 6.0 27.8 2,760 6.80 32.8 0.0160 8.50 2.50 <0.50 10.4
BC-20D (14-16')Ash North Portion of Cell 1 10/[7,17]/13 8.2 0.95 14.60 96.7 17.3 0.200 7.9 31.8 2,930 9.10 17.3 0.0190 11.70 1.50 <0.51 11.3
BC-20D (24-26')Ash North Portion of Cell 1 10/[7,17]/13 8.3 1.40 31.70 336.0 20.6 0.540 16.8 49.5 9,960 11.00 58.5 0.0360 18.10 5.20 <0.48 15.3
BC-30D (9-11')Ash West of Cell 3 10/[7,17]/13 7.8 1.10 36.20 553.0 10.9 0.540 11.3 28.7 8,380 9.10 70.0 0.0082 11.80 <0.89 <0.52 16.7
BC-30D (24-26')Ash West of Cell 3 10/[7,17]/13 8.3 0.49 16.50 270.0 <4.0 0.430 12.0 19.4 15,000 1.40 121.0 0.0230 9.90 <0.80 <0.51 5.5
BC-11/12 (89-91')Soil Divider Dike Cell 2/3 10/[23-28]/13 7.2 <0.49 <0.98 216.0 <4.9 <0.098 14.7 17.7 7,800 2.00 327.0 <0.0048 32.80 <0.98 <0.49 23.3
BC-15 (49-51')Soil Cell 2 10/[23-28]/13 6.2 <0.51 <1.00 47.5 <5.1 <0.100 1.3 27.8 18,000 2.50 260.0 0.0380 1.60 <1.0 <0.53 19.9
BC-17 (29-31')Soil Within Ash Storage Area (East of Cell 1)10/8/2013 5.6 <0.65 <1.30 380.0 <6.5 16.100 8.3 42.6 92,300 15.80 3180.0 0.0190 2.00 4.40 <0.50 92
BC-18 (24-26')Soil Within Ash Storage Area (East of Cell 1)10/8/2013 5.6 <0.66 <1.30 214.0 <6.6 7.700 3.8 11.8 61,400 10.50 794.0 0.0078 <0.66 6.20 <0.48 89.4
BC-19 (29-31')Soil Within Ash Storage Area (East of Cell 1)10/[7,17]/13 3.9 <0.65 <1.30 182.0 <6.5 6.100 2.1 6.8 53,300 8.60 798.0 0.0082 <0.65 3.50 <0.49 45
BC-20D (35-36')Soil North Portion of Cell 1 10/[7,17]/13 7.7 1.50 2.50 192.0 <5.4 0.900 1.1 32.2 56,800 1.20 601.0 0.0063 2.60 <1.10 <0.49 97.8
BC-30D (39-41')Soil West of Cell 3 10/[7,17]/13 9.8 0.66 3.20 192.0 <5.0 0.320 7.0 4.7 22,000 1.40 375.0 0.0072 4.90 <1.00 <0.50 55
BG-1 (9-11')Soil North of Cell 1 and West of Cell 3 10/[7-17]/13 5.4 1.20 <1.10 42.0 <5.3 1.300 <0.53 53.1 54,200 <0.53 405.0 0.0120 1.50 <1.10 <0.49 17.3
BG-1 (19-21')Soil North of Cell 1 and West of Cell 3 10/[7-17]/13 5.3 1.10 <1.40 159.0 <7.1 1.300 <0.71 64.5 73,100 1.30 930.0 0.0110 6.80 <1.40 <0.51 77.9
BG-1 (29-31')Soil North of Cell 1 and West of Cell 3 10/[7-17]/13 6.1 1.00 <1.20 185.0 <5.8 1.000 <0.58 42.0 65,700 1.10 936.0 <0.0044 4.90 <1.20 <0.50 90.5
BG-2 (9-11')Soil Southeast of Cell 1 and South of Cell 2 10/[7-17]/13 6.6 <0.57 <1.10 18.5 <5.7 0.140 3.3 5.5 9,300 9.20 179.0 0.0059 1.80 <1.10 <0.48 14.3
BG-2 (19-21')Soil Southeast of Cell 1 and South of Cell 2 10/[7-17]/13 5.8 <0.66 4.50 91.1 <6.6 0.630 10.8 49.7 44,900 1.90 543.0 0.0140 16.40 <1.30 <0.51 24.8
BG-2 (29-31')Soil Southeast of Cell 1 and South of Cell 2 10/[7-17]/13 7.1 <0.51 1.40 69.2 <5.1 <0.100 6.0 9.9 7,660 5.50 227.0 <0.0057 5.10 <1.00 <0.48 18.7
BG-3 (14-16')Soil Southwest of Cell 1 10/[7-17]/13 5.4 <0.69 <1.40 72.5 <6.9 10.200 261.0 133.0 70,200 6.20 303.0 <0.0049 184.00 3.80 <0.50 41.2
BG-3 (19-21')Soil Southwest of Cell 1 10/[7-17]/13 5.0 <0.70 <1.40 60.4 <7.0 12.600 154.0 125.0 81,100 7.70 864.0 <0.0077 166.00 4.50 <0.52 48.7
BG-3 (29-31')Soil Southwest of Cell 1 10/[7-17]/13 5.0 <0.96 <1.90 90.6 <9.6 7.900 130.0 122.0 73,000 6.70 1560.0 <0.0072 211.00 4.50 <0.50 44.9
IHSB Industrial Health-Based PSRG
IHSB Protection of Groundwater PSRG
Analytical Parameter
Units
Analytical Method
Tables - Page 24
Table 5 - Soil and Ash Analytical Results
Notes:
1.Units:
SU = Standard Units
mg/kg = milligrams per kilogram
2.N/A = Not applicable
3.NE = Not established
4.Sample depth interval in parentheses
Tables - Page 25
Table 6 - Surface Water Analytical Results
Temp.DO Cond.pH ORP Turbidity Alkalinity Aluminum Beryllium
˚C mg/L µmhos SU mV NTU mg/L CaCO3 µg/L µg/L
NA NA NA 6.0 - 9.0 NA NA NE 87 6.5
Analytical Method 2320B4d N/A N/A
Well Name Location Sample Collection Date Total N/A Dissolved Total Dissolved Total Dissolved Total N/A Dissolved Total Dissolved
AB-S1 DUP Cell 3 10/30/13, 11/01/13 22.8 N/A 517 7.00 N/A 6.00 45.3 N/A 2.1 2.10 23.1 26.2 0.0998 0.1160 N/A 200 237 <0.1AB-S2 Cell 3 10/30/13, 11/01/13 17.5 N/A 304 7.20 N/A 28.00 50.6 N/A 1.7 1.80 11.1 14.9 0.0909 0.1100 N/A 127 135 <0.1AB-S2 DUP Cell 3 10/30/13, 11/01/13 17.5 N/A 304 7.20 N/A 28.00 50.8 N/A 1.6 1.80 10.9 15.3 0.0917 0.1100 N/A 127 134 <0.1AB-S3 Cell 2 10/30/13, 11/01/13 18.0 N/A 504 7.20 N/A 24.00 49.1 N/A 2.7 2.80 25.0 25.8 0.0752 0.0911 N/A 193 202 <0.1AB-S4 Cell 2 10/30/13, 11/01/13 18.1 N/A 478 7.40 N/A 89.00 48.6 N/A 2.5 2.50 26.4 26.9 0.0692 0.0941 N/A 179 198 <0.1AB-S5 Cell 1 10/30/13, 11/01/13 19.3 N/A 536 7.30 N/A 26.00 68.2 N/A 1.8 1.90 22.6 31.0 0.1400 0.1630 N/A 178 192 <0.1Tower-0.3m Tower 3/7/2013 N/A 11.93 262 7.28 281 7.30 N/A N/A N/A 3.30 N/A 15.9 N/A 85.00 N/A N/A 177 N/ATower-0.3m Tower 7/9/2013 N/A 6.38 357 7.58 291 5.78 N/A N/A 2.5 2.17 50.9 50.3 88.00 91.00 N/A 190 193 <1Tower-0.3m Tower 11/4/2013 N/A 8.63 510 7.72 280 16.20 N/A N/A N/A 2.79 N/A 18.2 N/A 113.00 N/A N/A 191 N/ATower-0.3m Tower 3/4/2014 N/A 13.82 375 8.89 248 11.80 N/A N/A N/A 2.85 N/A 22.7 N/A 88.00 N/A N/A 173 N/ATower-0.3m Tower 7/1/2014 N/A 12.67 529 9.27 240 17.80 N/A N/A N/A 4.79 N/A 75.0 N/A 81.00 N/A N/A 244 N/ATower-0.3m Tower 11/3/2014 N/A 8.40 600 7.87 414 10.90 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
ArsenicAnalytical Parameter
Units
15A NCAC 02B .0200 Surface Water Quality Standard
Antimony
5.6 10
µg/L µg/L
1000 2
200.8 200.8 200.7 200.7 200.8
NE
Barium Boron Cadmiu
µg/L µg/L µg/L
Field Measurements
Tables - Page 26
Table 6 - Surface Water Analytical Results
Analytical Method
Well Name Location Sample Collection Date
AB-S1 DUP Cell 3 10/30/13, 11/01/13AB-S2 Cell 3 10/30/13, 11/01/13AB-S2 DUP Cell 3 10/30/13, 11/01/13AB-S3 Cell 2 10/30/13, 11/01/13AB-S4 Cell 2 10/30/13, 11/01/13AB-S5 Cell 1 10/30/13, 11/01/13Tower-0.3m Tower 3/7/2013Tower-0.3m Tower 7/9/2013Tower-0.3m Tower 11/4/2013Tower-0.3m Tower 3/4/2014Tower-0.3m Tower 7/1/2014Tower-0.3m Tower 11/3/2014
Analytical Parameter
Units
15A NCAC 02B .0200 Surface Water Quality Standard
Chloride
mg/L
230
300
Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total
<0.1 N/A 23.6 42.8 <5 <5 N/A N/A <5 <5 <0.05 0.118 <1 <1 N/A 7.32 12.0 75.3 <0.2 <0.2<0.1 N/A 15.8 23.2 <5 <5 N/A N/A <5 <5 <0.05 0.322 <1 <1 N/A 5.00 56.9 160.0 <0.2 <0.2<0.1 N/A 15.9 23.3 <5 <5 N/A N/A <5 <5 <0.05 0.295 <1 <1 N/A 5.04 60.4 157.0 <0.2 <0.2<0.1 N/A 24.0 46.7 <5 <5 N/A N/A <5 <5 0.137 0.374 <1 <1 N/A 7.91 146.0 180.0 <0.2 <0.2<0.1 N/A 23.3 43.5 <5 <5 N/A N/A <5 <5 0.110 0.511 <1 1.7 N/A 7.74 69.2 112.0 <0.2 <0.2<0.1 N/A 24.7 47.1 <5 <5 N/A N/A <5 <5 0.230 0.808 <1 <1 N/A 7.44 213.0 255.0 <0.2 <0.2<1.0 N/A 15.7 17.0 N/A <5 N/A N/A N/A <0.005 N/A 223 N/A <1 N/A 4.26 N/A 45.0 N/A N/A<1.0 15.8 15.7 31.0 <5 <5 N/A N/A <0.005 <0.005 29.00 121 <1 <1 5.75 5.71 21.0 63.0 N/A <0.05<1.0 N/A 22.7 42.0 N/A <5 N/A N/A N/A <0.005 N/A 257 N/A <1 N/A 7.52 N/A 148.0 N/A N/A<1.0 N/A 25.5 28.0 N/A <5 N/A N/A N/A N/A N/A 384 N/A <1 N/A 7.86 N/A 72.0 N/A N/A<1.0 N/A 29.4 45.0 N/A <5 N/A N/A N/A <0.005 N/A 169 N/A <1 N/A 9.54 N/A 21.0 N/A N/AN/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
m Calcium Chromium
µg/L µg/L
NE
Copper Iron Lead
mg/L µg/L
Cobalt
µg/L mg/L
200.7
3 7 1000 25
200.7
µg/L µg/L µg/L
Magnesium Manganese Mercury
200 0.012NE
200.7 200.8 245.1200.8
50
200.7 200.7 200.8
Tables - Page 27
Table 6 - Surface Water Analytical Results
Analytical Method
Well Name Location Sample Collection Date
AB-S1 DUP Cell 3 10/30/13, 11/01/13AB-S2 Cell 3 10/30/13, 11/01/13AB-S2 DUP Cell 3 10/30/13, 11/01/13AB-S3 Cell 2 10/30/13, 11/01/13AB-S4 Cell 2 10/30/13, 11/01/13AB-S5 Cell 1 10/30/13, 11/01/13Tower-0.3m Tower 3/7/2013Tower-0.3m Tower 7/9/2013Tower-0.3m Tower 11/4/2013Tower-0.3m Tower 3/4/2014Tower-0.3m Tower 7/1/2014Tower-0.3m Tower 11/3/2014
Analytical Parameter
Units
15A NCAC 02B .0200 Surface Water Quality Standard
Nitrate as N Strontium Sulfate TDS TOC TSS
mg-N/L mg/L mg/L mg/L mg/L mg/L
10 14 250 500 NE NE
300.0 N/A 300.0 2540C 5310B 2450D
Dissolved Total Dissolved Total Total Dissolved Total Dissolved Total Dissolved Total N/A Total N/A Dissolved Total N/A Total Dissolved Total
N/A N/A <5 <5.0 0.085 N/A 14.90 1.10 1.20 N/A 64.1 N/A 130.0 332 <0.200 <0.200 N/A N/A <10 <10N/A N/A <5 <5.0 <0.02 N/A 9.68 1.00 <1 N/A 33.9 N/A 58.5 242 <0.200 <0.200 N/A N/A <10 <10N/A N/A <5 <5.0 0.0256 N/A 9.87 1.10 <1 N/A 34.2 N/A 58.6 241 <0.200 <0.200 N/A N/A <10 <10N/A N/A <5 5.9 0.660 N/A 11.80 1.70 1.50 N/A 60.6 N/A 129.0 378 <0.200 <0.200 N/A N/A <10 <10N/A N/A <5 5.8 0.742 N/A 11.50 1.50 1.40 N/A 57.5 N/A 116.0 351 <0.200 <0.200 N/A N/A <10 <10N/A N/A <5 6.0 <0.02 N/A 15.60 <1 <1 N/A 63.4 N/A 123.0 377 <0.2 <0.2 N/A N/A <10 <10N/A N/A N/A <5.0 0.460 N/A 5.91 N/A 1.21 N/A 20.5 N/A 62.0 170 N/A 0.282 N/A N/A N/A <0.005N/A N/A <5 <5.0 <0.023 6.12 6.17 1.35 1.16 39.5 39.5 N/A 70.0 220 <0.200 <0.200 N/A <5 <0.005 <0.005N/A N/A N/A 6.0 0.230 N/A 10.60 N/A 1.25 N/A 59.3 N/A 120.0 330 N/A <0.200 N/A N/A N/A <0.005N/A N/A N/A <5.0 0.280 N/A 7.84 N/A 1.02 N/A 36.5 N/A 89.0 260 N/A <0.200 N/A N/A N/A 0.006N/A N/A N/A <5.0 <0.023 N/A 9.95 N/A 1.38 N/A 59.1 N/A 120.0 350 N/A <0.200 N/A N/A N/A <0.005N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
µg/L µg/L
Molydenum Nickel
mg/L µg/L mg/L µg/L mg/L
Potassium Selenium Sodium Thallium Zinc
0.05
200.7 200.8 200.7 200.8 200.7
0.245NENE16025
200.8 200.7
Tables - Page 28
Table 6 - Surface Water Analytical Results
Notes:1.Analytical parameter abbreviations:
Temp. = Temperature
DO = Dissolved oxygen
Cond. = Specific conductance
ORP = Oxidation reduction potential
TDS = Total dissolved solids
TSS = Total suspended solids
TOC = Total organic carbon
2.Units:
˚C = Degrees Celsius
SU = Standard Units
mV = millivolts
µS = microsiemens
NTU = Nephelometric Turbidity Unit
mg/L = milligrams per liter
ug/L = micrograms per liter
CaCO3 = calcium carbonate
3.N/A = Not applicable
4.NE = Not established
5.Highlighted values indicate values that exceed the 15A NCAC 2B Standard
6.Analytical results with "<" preceding the result indicates that the parameter was not detected at a concentration which attains or exceeds the laboratory reporting limit.
Tables - Page 29
Table 7 - Ash Basin Pore Water Analytical Results
Temp.Cond.pH Turbidity Alkalinity Aluminum Beryllium*Chloride
˚C µmhos SU NTU mg/L CaCO3 mg/L ug/L mg/L
NE NE 6.5 - 8.5 NE NE NE 4 250
Analytical Method 2320B4d N/A N/A 300
Well Name Location Sample Collection Date Total N/A Dissolved Total Dissolved Total Dissolved Total N/A Dissolved Total Dissolved Total Dissolved Total Total
BC-18 Wells Inside Waste Boundary 10/[30,31]/13 19.2 29 4.8 322 8 N/A <1.0 <1.0 <1 <10 58.2 116 N/A <50 <50 <0.1 <1 N/A 0.691 <5BC-20S Wells Inside Waste Boundary 10/[30,31]/13 21.8 607 6.5 8 141 N/A 11.0 10.9 116 117 140 164 N/A 782 871 <0.1 <0.1 N/A 60.8 28.6BC-20D Wells Inside Waste Boundary 10/[30,31]/13 19.9 579 8.1 9 90 N/A 1.3 1.3 263 255 87.5 105 N/A 593 652 <0.1 <0.1 N/A 38.7 45.1BC-30S Wells Inside Waste Boundary 10/[30,31]/13 18.1 660 7.0 9 243 N/A <1.0 <1.0 666 670 195 233 N/A 363 426 <0.1 <0.1 N/A 91.7 12.5BC-30S DUP Wells Inside Waste Boundary 10/[30,31]/13 18.1 660 7.0 9 231 N/A <1.0 <1.0 659 674 194 234 N/A 366 414 <0.1 <0.1 N/A 90.5 12.8BC-30D-2 Wells Inside Waste Boundary 10/[30,31]/13 18.9 554 8.1 9 192 N/A <1.0 <1.0 290 303 262 305 N/A 298 332 <0.1 <0.1 N/A 76.9 10.4
200.7 200.7 200.8 200.7
1 10 700 700 2 NE
ug/L ug/L ug/L ug/L ug/L mg/L
Barium Boron Cadmium Calcium
200.8 200.8
ArsenicAnalytical Parameter
Units
15A NCAC 02L .0202(g) Groundwater Quality Standard
Antimony*
Field Measurements
Tables - Page 30
Table 7 - Ash Basin Pore Water Analytical Results
Analytical Method
Well Name Location Sample Collection Date
BC-18 Wells Inside Waste Boundary 10/[30,31]/13BC-20S Wells Inside Waste Boundary 10/[30,31]/13BC-20D Wells Inside Waste Boundary 10/[30,31]/13BC-30S Wells Inside Waste Boundary 10/[30,31]/13BC-30S DUP Wells Inside Waste Boundary 10/[30,31]/13BC-30D-2 Wells Inside Waste Boundary 10/[30,31]/13
Analytical Parameter
Units
15A NCAC 02L .0202(g) Groundwater Quality Standard
Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved Total Dissolved
<5 40.1 N/A N/A <0.005 0.005 108 8,000 <1 2.5 N/A 2.1 147 352 <0.2 <0.2 N/A N/A <5<5 <5 N/A N/A <0.005 <0.005 <50 81.9 <1 <1 N/A 12 104 120 <0.2 <0.2 N/A N/A 11<5 <5 N/A N/A <0.005 <0.005 <50 165 <1 <1 N/A 6.89 52.4 60.7 <0.2 <0.2 N/A N/A <5<5 <5 N/A N/A <0.005 <0.005 7,630 9,290 <1 <1 N/A 17.1 2,840 3,410 <0.2 <0.2 N/A N/A <5<5 <5 N/A N/A <0.005 <0.005 7,770 9,100 <1 <1 N/A 16.8 2,840 3,340 <0.2 <0.2 N/A N/A <5<5 <5 N/A N/A <0.005 <0.005 371 612 <1 <1 N/A 17.4 606 678 <0.2 <0.2 N/A N/A <5
NE 50 1 NE 100
200.7 200.8 245.1 200.8 200.
Magnesium Manganese Mercury Molydenum Nick
ug/L ug/L ug/L ug/L ug/L
200.8
10 1 1 300 15
200.7 200.8 200.7 200.7
ug/L mg/L ug/L ug/L
Copper Iron Lead
ug/L
Chromium Cobalt*
Tables - Page 31
Table 7 - Ash Basin Pore Water Analytical Results
Analytical Method
Well Name Location Sample Collection Date
BC-18 Wells Inside Waste Boundary 10/[30,31]/13BC-20S Wells Inside Waste Boundary 10/[30,31]/13BC-20D Wells Inside Waste Boundary 10/[30,31]/13BC-30S Wells Inside Waste Boundary 10/[30,31]/13BC-30S DUP Wells Inside Waste Boundary 10/[30,31]/13BC-30D-2 Wells Inside Waste Boundary 10/[30,31]/13
Analytical Parameter
Units
15A NCAC 02L .0202(g) Groundwater Quality Standard
Nitrate as N Strontium Sulfate TDS TOC TSS
mg-N/L ug/L mg/L mg/L mg/L mg/L
10 NE 250 500 N/A NE
300.0 N/A 300.0 2540C 5310B N/A
Total Total Dissolved Total Dissolved Total Dissolved Total N/A Total Total Dissolved Total Total Total Dissolved Total
21.5 <0.0200 N/A <5.00 <1.0 <10.0 N/A <5.0 N/A 5 33 <0.20 <0.20 N/A N/A 0.0119 0.02716.4 0.0278 N/A 15.00 21.1 21.1 N/A 45.8 N/A 142 435 0.75 0.78 N/A N/A <0.0100 <0.010<5.0 <0.0200 N/A 16.40 <1.0 <1.0 N/A 65.8 N/A 138 375 <0.20 <0.20 N/A N/A <0.0100 <0.010<5.0 <0.0200 N/A 8.09 <1.0 <1.0 N/A 25.8 N/A 115 440 <0.20 <0.20 N/A N/A <0.0100 <0.010<5.0 <0.0200 N/A 7.90 <1.0 <1.0 N/A 25.2 N/A 118 438 <0.20 <0.20 N/A N/A <0.0100 <0.010<5.0 <0.0200 N/A 7.69 <1.0 <1.0 N/A 21.9 N/A 106 358 <0.20 <0.20 N/A N/A <0.0100 <0.010
NE 20 NE 0.2 1
200.7 200.8 200.7 200.8 200.7
Potassium Selenium Sodium Thallium*Zinc
mg/L ug/L mg/L ug/L mg/L
0
7
el
L
Tables - Page 32
Table 7 - Ash Basin Pore Water Analytical Results
Notes:
1.Analytical parameter abbreviations:
Temp. = Temperature
DO = Dissolved oxygen
Cond. = Specific conductance
ORP = Oxidation reduction potential
TDS = Total dissolved solids
TSS = Total suspended solids
TOC = Total organic carbon
2.Units:
3.˚C = Degrees Celsius
SU = Standard Units
µS = microsiemens
NTU = Nephelometric Turbidity Unit
mg/L = milligrams per liter
ug/L = micrograms per liter
CaCO3 = calcium carbonate
N/A = Not applicable
4.NE = Not established
5.* Interim Maximum Allowable Concentration (IMAC) standards
6.Highlighted cells indicate concentrations that exceed the 15A NCAC 2L Standard
7.Analytical results with "<" preceding the result indicates that the parameter was not detected at a concentration which attains or exceeds the laboratory reporting limit
Tables - Page 33
Table 8 - Seep Analytical Results
pH Temp.Cond.Flow Aluminum Antimony Arsenic Barium Boron Cadmium Calcium Chloride Chromium COD Copper Fluoride Hardness
SU °C µmhos/cm MGD mg/l µg/l µg/l mg/l mg/l µg/l mg/l mg/l µg/l mg/l µg/l mg/l mg/l (CaCO3)
6.0-9.0 NE NE NE 0.087 5.6 10 1.0 NE 2 NE 230 50 NE 7 1.8 100
200.7 200.8 200.8 200.7 200.7 200.8 200.7 300.0 200.8 HACH 8000 200.8 300.0 200.7
Seep ID Location Sample Collection DateS-1 East of Cell 3 9/10/2014 6.65 20.6 202 0.0023 5.04 <1 1.08 0.218 0.214 <1 14.3 11.0 3.32 <20 6.52 0.12 73S-2 East of Cell 3 9/10/2014 6.30 20.3 139 0.0016 4.26 <1 <1 0.062 <0.05 <1 13.0 5.3 4.48 <20 7.35 0.12 61.2S-3 East of Cell 3 9/10/2014 6.57 19.6 153 0.0021 4.13 <1 <1 0.079 <0.05 <1 13.3 6.3 4.02 <20 6.81 0.12 61.6S-4 Northeast of Cell 3 9/10/2014 6.89 16.7 181 0.0132 14.1 <1 <1 0.078 0.255 <1 15.0 14.0 9.00 <20 13.60 <0.1 64.2S-5 North of Cell 2 & 3 9/10/2014 6.80 19.4 242 0.0029 0.339 <1 <1 0.042 0.729 <1 15.1 11.0 <1 <20 <1 0.11 82.4S-6 North of Cell 2 9/10/2014 6.12 15.8 537 0.0225 0.288 <1 <1 0.051 <0.05 <1 67.6 5.8 1.32 <20 <1 <0.5 268S-7 Northwest of Cell 1 9/10/2014 7.37 21.8 127 0.0002 2.55 <1 <1 0.042 <0.05 <1 13.9 4.9 2.06 20 4.84 0.16 58.6S-8 Northwest of Cell 1 9/10/2014 6.86 24.4 328 0.021 0.232 <1 <1 0.039 0.474 <1 25.4 18.0 <1 <20 <1 0.12 115S-9 West of Cell 1 9/10/2014 7.09 19.6 328 0.0016 1.77 <1 <1 0.052 0.815 <1 32.9 14.0 4.28 <20 5.62 0.21 145S-10 West of Cell 1 9/10/2014 7.20 16.6 141 0.0049 0.18 <1 <1 0.035 <0.05 <1 13.0 4.1 <3.27 <20 <1 <0.1 60.1
Field MeasurementsAnalytical Method
Analytical Parameter
Units
15A NCAC 02B .0200 Surface Water Quality Standard
Tables - Page 34
Table 8 - Seep Analytical Results
Seep ID Location Sample Collection DateS-1 East of Cell 3 9/10/2014S-2 East of Cell 3 9/10/2014S-3 East of Cell 3 9/10/2014S-4 Northeast of Cell 3 9/10/2014S-5 North of Cell 2 & 3 9/10/2014S-6 North of Cell 2 9/10/2014S-7 Northwest of Cell 1 9/10/2014S-8 Northwest of Cell 1 9/10/2014S-9 West of Cell 1 9/10/2014S-10 West of Cell 1 9/10/2014
Analytical Method
Analytical Parameter
Units
15A NCAC 02B .0200 Surface Water Quality Standard
Iron Lead Magnesium Manganese Mercury Molybdenum Nickel Oil & Grease Selenium Sulfate Thallium TDS TSS Zinc
mg/l µg/l mg/l mg/l µg/l µg/l µg/l mg/l µg/l mg/l µg/l mg/l mg/l mg/l
1.0 25 NE 0.200 0.012 160 25 see note 6 5 250 0.24 500 NE 0.05
200.7 200.8 200.7 200.7 245.1 200.8 200.8 1664B 200.8 300.0 200.8 SM2540C SM2540D 200.7
11.9 4.17 9.04 4.6 <0.05 <1 2.35 <5 <1 15 <0.2 150 79 0.0298.7 3.21 6.96 0.206 <0.05 <1 3.87 <5 <1 2 <0.2 120 110 0.0238.71 3.44 6.91 0.322 <0.05 <1 2.83 <5 <1 4.7 <0.2 130 150 0.01523.4 7.55 6.49 0.155 <0.05 <1 5.23 5 <1 26 <0.2 170 250 0.030.727 <1 10.8 0.297 <0.05 <1 <1 5 <1 55 <0.2 170 12 <0.0050.479 <1 24.2 0.007 <0.05 <1 <1 <5 <1 220 <0.2 430 19 <0.0054.88 3.22 5.8 0.265 <0.05 7.53 <1 <5 <1 5.6 <0.2 99 24 0.0830.452 <1 12.5 1.270 <0.05 8.04 2.35 <5 <1 110 <0.2 230 5 0.0213.52 2.05 15.4 0.214 <0.05 6.61 9.53 <5 <1 52 <0.2 250 24 0.0150.337 <1 6.72 0.011 <0.05 <1 1.51 <5 <1 5.7 <0.2 120 40 <0.005
Tables - Page 35
Table 8 - Seep Analytical Results
Notes:
1.Analytical parameter abbreviations:
Temp. = Temperature
Cond. = Specific conductivity
COD = Chemical oxygen demand
TDS = Total dissolved solids
TSS = Total suspended solids
2.Units:
˚C = Degrees Celsius
SU = Standard Units
µS/cm = microsiemens per centimeter/micromhos per centimeter
MGD = millions of gallons per day
mg/L = milligrams per liter
µg/l = micrograms per liter
CaCO3 = calcium carbonate
3.NE = Not established
4.Highlighted values indicate values that exceed the 15A NCAC 2B Standard
5.Analytical results with "<" preceding the result indicates that the parameter was not detected at a concentration which attains or exceeds the laboratory reporting limit
6.Take the lowest LC50 available for the particular type of OG you have (or similar OG) and multiply it by a safety factor of 0.01 to obtain the criteria
Tables - Page 36
TABLE 9 – ENVIRONMENTAL EXPLORATION AND SAMPLING PLAN
BUCK COMBINED CYCLE STATION
Exploration
Area Soil Borings Shallow Monitoring Wells Deep Monitoring Wells Bedrock Monitoring Wells Water Supply Wells Surface Water
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-10
10 80-120
AB-2S/SL,
AB-3S/SL,
AB-4S/SL,
AB-5S/SL,
AB-7S/SL,
AB-8S/SL,
AB-9S,
AB-10S
14 20-40 15
AB-1D, AB-2D, AB-
3D, AB-4D, AB-5D,
AB-6D, AB-7D, AB-
8D, AB-9D, and
AB-10D
10 50-100 65-115 5 AB-9BR 1 70-120 120-170 5 N/A N/A 7 14
Ash Storage
AS-1, AS-
2, and
AS-3
3 60-100 AS-1S and
AS-3S 2 50-55 15 AS-1D, AS-2D, and
AS-3D 3 65-85 80-100 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-11
11 15-75
GWA-1S,
GWA-3S,
GWA-4S,
GWA-5S,
GWA-6S,
GWA-7S,
GWA-9S,
GWA-10S,
and
GWA-11S
9 15-60 10-15
GWA-1D, GWA-2D,
GWA-3D, GWA-4D,
GWA-5D, GWA-6D,
GWA-7D, GWA-8D,
GWA-9D, GWA-
10D, and GWA-11D
11 25-75 40-100 5 GWA-2BR,
GWA-9BR 2 45-105 95-155 5
Existing
Water
Supply
Well
1
2 Stream
16 Seep
1 Off-site
Pond
37
Background
BG-1, BG-
2, and BG-
3
3 30-100
BG-1S, BG-
2S, and BG-
3S
3 15-30 10-15 BG-1D, BG-2D, and
BG-3D 3 40-80 60-100 5 BG-1BR, 1 65-105 115-155 5 N/A N/A N/A N/A
Notes:
1. Estimated boring and well depths based on data available at the time of work plan preparation and subject to change based on site-specific conditions in the field.
2. Laboratory analyses of soil, ash, groundwater, and surface water samples will be performed in accordance with the constituents and methods identified in Tables 10 and 11.
3. Additionally, soils will be tested in the laboratory to determine grain size (with hydrometer), specific gravity, and permeability.
4. During drilling operations, downhole testing will be conducted to determine in-situ soil properties such as horizontal and vertical hydraulic conductivity.
5. Actual number of field and laboratory tests will be determined in field by Field Engineer or Geologist in accordance with project specifications.
6. Surface water, stream, and seep sample locations include both water and sediment samples except for offsite pond which only includes water sample.
Tables - Page 37
TABLE 10 – SOIL AND ASH PARAMETERS AND CONSTITUENT ANALYTICAL
METHODS
INORGANIC COMPOUNDS UNITS METHOD
Antimony mg/kg EPA 6020A
Arsenic mg/kg EPA 6020A
Barium mg/kg EPA 6010C
Boron mg/kg EPA 6010C
Cadmium mg/kg EPA 6020A
Chloride mg/kg EPA 9056A
Chromium mg/kg EPA 6010C
Copper mg/kg EPA 6010C
Iron mg/kg EPA 6010C
Lead mg/kg EPA 6020A
Manganese mg/kg EPA 6010C
Mercury mg/kg EPA Method 7470A/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 38
TABLE 11 – GROUNDWATER, SURFACE WATER, AND SEEP PARAMETERS AND
CONSTITUENT ANALYTICAL METHODS
PARAMETER RL UNITS METHOD
FIELD PARAMETERS
pH NA SU Field Water Quality Meter
Specific Conductance NA mmho/cm Field Water Quality Meter
Temperature NA 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
Total Combined Radium (Ra-226 and
Ra-228)4
5 pCi/L EPA 903.0
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
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
Sulfide5 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 (Fe(II), Fe(III) Speciation 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 -3S/D, and BG-1S/D) . DWR regional office will be consulted
to determine if additional wells are to be sampled.
5. Sulfide as H2S sampled in groundwater samples only.
6. All EPA methods and RLs are at or below respective 2L or 2B standards for constituents with standards.
Tables - Page 39
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.
Tables - Page 40
1
Appendix B
Site Plan for Modeling Cross Sections Buck
Steam Station Ash Basin Duke Energy
Carolinas, LLC Rowan County, NC, Figure 4,
March 10, 2014 DRAFT; Cross Sections A-A’,
B-B’, C-C’
BC-18BC-23BC-22BC-32BC-20SBC-20DBC-20STREAMBC-17COMPLIANCE BOUNDARYOW-10MW-9SMW-9DWASTE BOUNDARYMW-1SMW-1DMW-11SBC-15MW-11DBC-5BC-18YADKIN RIVERCOMPLIANCE BOUNDARYOW-2OW-3OW-1BC-30BC-30D-2BC-30S(COINCIDENT WITH
DUKE ENERGY
PROPERTY BOUNDARY
AND WASTE BOUNDARY)B-1B-2B-3B-4B-10B-11B-6B-7WASTE BOUNDARYProfile View of ALIGNMENT CMW-5DMW-10DBC-30BC-30D-2B-11B-10B-9B-8WASTE BOUNDARY
WASTE BOUNDARY
COMPLIANCE BOUNDARY
COMPLIANCE BOUNDARYSTREAM(COINCIDENT WITH DUKEENERGY PROPERTY BOUNDARYAND WASTE BOUNDARY)40'SCALE1 inch = 80 Feet040'80'50'SCALE1 inch = 100 Feet050'100'CROSS SECTION A-A'CROSS SECTION B-B'LEGEND:WATER TABLE SURFACE (ESTIMATED)ASHF = FILLALLUVIUMM1 = SOIL/SAPROLITE (SPT N<100)M2 = SAPROLITE/WEATHERED ROCK (SPT N>100 or REC<50%)WF = PARTIALLY WEATHERED/FRACTURED ROCK (REC>50% and RQD<50%)D = SOUND ROCK (REC>85% and RQD>50%)CELL 1(SLUICED ASH)ASH STORAGE AREA(ASH FILL)MAIN DIKEADDITIONALPRIMARY DIKEASH STORAGE AREA(ASH FILL)BLANKET TOE DRAIN(SEE NOTE 5)NOTES:1. SEE FIGURE 4 (SITE MAP FOR MODELING CROSS SECTIONS) FOR LOCATION OF CROSS SECTIONS.2. SURFACE TOPOGRAPHY DATA FOR THE SITE PROVIDED BY WSP (DATED DECEMBER 2013).3. HYDROSTRATIGRAPHIC LAYERS BASED ON ASH BASIN CLOSURE EXPLORATION BORING DATA, COMPLIANCE AND VOLUNTARYGROUNDWATER MONITORING WELL BORING DATA, PRE-BASIN CONSTRUCTION BORING DATA, AND PRELIMINARY ENGINEERINGSTUDY BORING DATA (S&ME, DATED JANUARY 23, 2009). 4. MAIN DIKE AND ADDITIONAL PRIMARY DIKE DETAILS BASED ON PRE-CONSTRUCTION DESIGN DRAWINGS PROVIDED BY DUKEENERGY (MAIN DIKE: DWG NO. B-3039-D REV 24, ADDITIONAL PRIMARY DIKE: DWG NO. B-3039-D2 REV 3).5. LOCATION OF THE TOE DRAIN AND BLANKET DRAIN SHOWN ON CROSS SECTION A-A' (AT TOE OF ADDITIONAL PRIMARY DIKE) ISBASED ON DESIGN DRAWING NO. B-3039-D2 REV 3.6. LOCATION OF THE BLANKET TOE DRAIN SHOWN ON CROSS-SECTION B-B' (AT TOE OF MAIN DIKE) IS BASED ON DESIGN DRAWINGNO. B-3039-D REV 24.7. HYDROSTRATIGRAPHIC DESIGNATION DESCRIPTION PARAMETERS:SPT = STANDARD PENETRATION TEST%REC = PERCENT RECOVERYRQD = ROCK QUALITY DESIGNATION8. WATER LEVELS FOR OBSERVATION AND MONITORING WELLS WERE GAUGED BY HDR ON JANUARY 13, 2014.9. BORINGS AND/OR WELLS SHOWN WITH A "BC" DESIGNATION WERE A PART OF THE ASH BASIN CLOSURE ASSESSMENT ACTIVITIES.10. BORINGS SHOWN WITH A "B" DESIGNATION WERE A PART OF A PRELIMINARY ENGINEERING STUDY PERFORMED BY S&ME FORTHE CONSTRUCTION OF AN INDUSTRIAL LANDFILL (DATED JANUARY 23, 2009).11. WELLS WITH A "MW" DESIGNATION ARE A PART OF THE SITE'S GROUNDWATER MONITORING PROGRAM.12. WELLS WITH A "OW" DESIGNATION ARE A PART OF THE SITE'S DAM SAFETY OBSERVATION WELL PROGRAM.CELL 2(SLUICED ASH)DRAFTMARCH 10, 2014TOE DRAIN ANDBLANKET DRAIN(SEE NOTE 5)DUKEVILLE RD50'SCALE1 inch = 100 Feet050'100'CROSS SECTION C-C'CELL3(SLUICED ASH)CELL 3(SLUICED ASH)DIVIDER DIKESWNEEASTWESTSENW
2
Appendix C
Review of Groundwater Assessment Work
Plan Letter from S. Jay Zimmerman, Chief,
Water Quality Regional Operations Section,
NCDENR, To Harry Sideris, Duke Energy,
dated November 4, 2014.