3606_HardinCDLF_December2022GWMR_FID1830540_20240221

SECOND SEMI-ANNUAL 2022
GROUNDWATER MONITORING EVENT
GASTON COUNTY CLOSED CONSTRUCTION & DEMOLITION LANDFILL - HARDIN SITE
PERMIT NO.: 36-06
3155 PHILADELPHIA CHURCH ROAD
DALLAS, NORTH CAROLINA

Prepared for:

Mr. Dan Ziehm, PE
Gaston County Public Works
P.O. Box 1578
Gastonia, North Carolina 28053

October 3, 2023

Prepared by:
____________________________
Ross Klingman, P.G.
Senior Geologist

SECOND SEMI-ANNUAL 2022
GROUNDWATER MONITORING EVENT
GASTON COUNTY CLOSED CONSTRUCTION & DEMOLITION LANDFILL - HARDIN SITE
PERMIT NO.: 36-06
3155 PHILADELPHIA CHURCH ROAD
DALLAS, NORTH CAROLINA

TABLE OF CONTENTS

1.0 Introduction 1

2.0 Background Information 3

3.0 Groundwater Monitoring Activities 4

4.0 Shallow Groundwater Flow Direction and Rate 5

5.0 Groundwater Analytical Results 6

6.0 Conclusions 7

7.0 Recommendations 8

LIST OF FIGURES

1. Site Location Map
2. Site Layout Map
3. Shallow Groundwater Flow Direction Map – Second Semi-Annual 2022
4. Groundwater Analytical Results – Second Semi-Annual 2022

LIST OF TABLES

1. Groundwater Gauging and Field Parameter Data
2. Groundwater Analytical Results
3. Historical Groundwater Analytical Results, MW-12
4. Historical Groundwater Analytical Results, MW-13
5. Historical Groundwater Analytical Results, MW-14

APPENDICES

A. NCSWS Memorandums – PFAS Monitoring – March 13, 2023 and July 17, 2023
B. Laboratory Data Sheets
Page | 1

SECOND SEMI-ANNUAL 2022
GROUNDWATER MONITORING EVENT
GASTON COUNTY CLOSED CONSTRUCTION & DEMOLITION LANDFILL - HARDIN SITE
PERMIT NO.: 36-06
3155 PHILADELPHIA CHURCH ROAD
DALLAS, NORTH CAROLINA
1.0 INTRODUCTION

Buxton Environmental, Inc. (BEI) respectfully submits the methods and results of the second semi-annual 2022
groundwater monitoring activities conducted at the Gaston County Closed Construction & Demolition (C&D)
Landfill - Hardin Site (Permit No.: 36-06) located at 3155 Philadelphia Church Road in Dallas, North Carolina.
The closed C&D landfill is an unlined facility which was in operation from approximately 1994 until 1998, and
is regulated under old North Carolina Department of Environmental Quality, Division of Waste Management-
Solid Waste Section (NCSWS) 15A NCAC 13B .0500 Rules (pre-.0544 Rules). The C&D landfill was capped
with a clay cover following its closure. The purpose for conducting the assessment was to monitor groundwater
quality. A site location map and site layout map are provided in Figures 1 and 2, respectively.

The groundwater monitoring activities were conducted in general accordance with current NCSWS rules and
guidelines; the NCSWS groundwater and surface water sampling guidelines dated April 2008; a June 25, 2010
memorandum from the NCSWS requiring the analysis is tetrahydrofuran at C&D landfills; the NCSWS letter
dated September 9, 2016 concerning 14-day notification following a groundwater constituent exceedance of
North Carolina Groundwater Protection Standards (NCGPSs) for the first-time; a March 23, 2017 memorandum
from the NCSWS concerning routine up-keep and maintenance issues at monitoring wells; and a May 29, 2018
memorandum from the NCSWS requiring the analysis of 1,4-dioxane by EPA Method 8260 (VOCs) or EPA
Method 8270 (semi-VOCs) utilizing the select ion monitoring (SIM) procedure, the discontinuation of Solid
Waste Section Limits (SWSLs, minimum laboratory detection limits) and opting for EPA approved analytical
methods sufficiently sensitive to quantify the presence of constituents at or below applicable standards.

The NCGPSs are generally defined by the NCSWS as the most protective of the Federal Maximum
Contaminant Level for Drinking Water (MCL), the North Carolina 2L Groundwater Quality Standards (2L
NCGQSs), or NCGPSs established by the NCSWS (generally obtained from interim established 2L NCGQSs).
The NCGPS and 2L NCGQS for non-naturally occurring constituents with no established standard is the
practical quantitation limit (PQL). For naturally occurring constituents (i.e. metals), the NCGPS and the 2L
NCGQS is the naturally occurring background concentration. For clarity purposes, the NCGPSs and 2L
NCGQSs are essentially synonymous with each other. According to the NCGPSs and 2L NCGQSs, non-
quantified J-flagged laboratory data (estimated qualified data) which are detected less than the quantifiable
PQL, limit of quantitation (LOQ) or reporting limit (RL) (all synonyms) and above the method detection limit
(MDL) (lowest non-quantified limits of the laboratory instrumentation) are not considered exceedances of
NCGPSs or 2L NCGQSs. The NCGPSs in this report have been updated to reflect current standards issued by
the NCSWS on April 11, 2022.

On March 2, 2020, Mr. Ervin Lane (site project manager) with the NCSWS indicated that a new policy would
allow permitted landfills to discontinue/reduce the required analysis of 1,4-dioxane (by EPA SIM) during
routine monitoring at compliance groundwater monitor wells and surface water sample locations, if they have
been below the MDL for two (2) consecutive events.

On March 13, 2023, the NCSWS issued a memorandum requiring per- and polyfluoroalkyl substances (PFAS)
analyses during groundwater, surface water and leachate monitoring conducted after July 1, 2023 at all landfills
regulated under 15A NCAC 13B Rules: 0601 and .0602 (all other landfills not regulated under .0531-0546 and
.1600 rules); .0544 and .0545 (C&D landfills); and .1623, and .1630 - .1637 (Subtitle D lined MSW landfills).
According to the memo, PFAS include a group of manufactured compounds used in aerospace, automotive,
Page | 2

textiles, electronics, food packaging, stain-repellent products, non-stick products and firefighting foams that do
not breakdown in the environment and bioaccumulate in humans and animals through soil and drinking water
and are linked to adverse health effects. On July 20, 2023, Mr. Perry Sugg (NCSWS - Environmental
Compliance Branch Head), clarified that PFAS monitoring was also required at old closed MSW landfills that
fall under old NCSWS Rule .0500 that defaults to North Carolina 2L groundwater monitoring rules. Water
samples should be analyzed by EPA (Draft) Method 1633 (PFAS) by a Department of Defense (DOD)
accredited laboratory. The March 13, 2023 memorandum from the NCSWS regarding PFAS monitoring
requirements is provided in Appendix A.

On July 17, 2023, the NCSWS issued a memorandum clarifying PFAS monitoring requirements at solid waste
sanitary landfills. The letter addresses landfill types that should comply; monitoring frequency (minimum of
two (2) consecutive sample events, after which the data will be evaluated for future continued monitoring
requirements); sampling methodology (including sampling practices and precautions to avoid equipment cross-
contamination); analytical method and laboratories (EPA (Draft) Method 1633 for up to 40 PFAS compounds
by a DOD accredited laboratory); monitoring locations (groundwater wells, surface water locations, underdrains
(French drains) and leachate); and reporting (routine report preparation and submittal, along with electronic
deliverable data (EDD) requirements in the EQUIS format). The July 17, 2023 memorandum from the NCSWS
clarifying PFAS monitoring requirements is provided in Appendix A.

A summary of background information, and the methods, results, conclusions and recommendations of this
investigation are outlined below.
Page | 3

2.0 BACKGROUND INFORMATION

The Gaston County Landfill - Hardin Site consists of approximately 426 acres and is located on the north
central side of Gaston County, approximately 1.5 miles south of the Lincoln County line (Figure 1). The
landfill site has been in operation since approximately 1985. The subject facility presently contains four landfill
areas, which include a closed construction and demolition (C&D) landfill (subject landfill); a closed unlined
MSW landfill with inactive C&D landfill on-top; an active Unit I Phase 1 and Phase 2 lined MSW Subtitle D
landfill; and the additional active Unit II Phase 1 & 2 lined MSW Subtitle D landfill (Figure 2). In addition, the
new Unit III lined MSW Subtitle D landfill expansion is under construction, and will tie into the Unit I landfill
to the west and the Unit II landfill to the east, and span across the drainage swale.

The closed C&D landfill is an unlined unit, which was in operation from approximately 1994 until 1998.

Groundwater monitoring has been conducted at the subject C&D landfill since June 1995. The groundwater
samples have historically been analyzed for Appendix I VOCs and RCRA metals.

In 2003 and 2011, Gaston County purchased approximately 45 acres from the drainage ditch to the South Fork
Catawba River on the southwest side of the site. In April 2009, Gaston County purchased 34.16 acres on the
northeast side of the landfill. In September 2013, Gaston County purchased the McGee property (14.36 acres)
to the immediate northeast of the landfill. This additional property serves as excellent landfill buffer.

On July 13, 2018, the NCSWS issued a memorandum based on North Carolina House Bill 573 (approved on
June 25, 2018) indicating that C&D landfills regulated under NCSWS 15A NCAC 13B Rule .0544 could alter
routine groundwater and surface water monitoring frequency from a semi-annual basis to an annual basis.
According to the NCSWS memorandum, annual monitoring is only allowed at stand-alone C&D facilities in
Detection Monitoring; and does not apply to facilities presently in Assessment Monitoring, corrective action or
have documented exceedances of NCGPSs, which would be required to continue semi-annual monitoring. On
July 17, 2018, Mr. Adam Ulishney with the NCSWS indicated that the new policy did not apply to old C&D
landfills permitted under pre-.0544 Rules (which is the case for the subject site), however, he indicated that the
NCSWS would consider applying this Rule to old closed C&D landfills on a case-by-case basis in the future.

In October 2018, Mr. Ross Klingman, P.G. with BEI conducted routine up-keep and maintenance at on-site
monitor wells, in order to comply with the March 23, 2017 memorandum from the NCSWS. During these
activities, repairs and up-keep were made at the following monitor wells: MW-12 (dirt and vegetation were
removed from the concrete pad); MW-13 (dirt and vegetation were removed from the concrete pad); and MW-
14 (dirt and vegetation were removed from the concrete pad, and a new expandable well cap was installed at the
well head). During the well maintenance activities, the latitude and longitude at each groundwater monitor well
were obtained with the “My GPS Coordinates” software, and well construction information was obtained from
the well tags, which are presented in Table 1.

BEI recommended in the March 2, 2020 Second Semi-Annual 2019 Groundwater Monitoring Event report that
the analysis of 1,4-dioxane (by EPA Method 8260 SIM) be discontinued during routine monitoring at monitor
wells MW-12, MW-13 and MW-14, in accordance with the new NCSWS policy that allows 1,4-dioxane (SIM)
to be eliminated/reduced from the sampling protocol following two (2) consecutive events with below MDL
results. Groundwater samples collected at these wells did not indicated the presence of 1,4-dioxane (SIM or
non-SIM) above the MDL during all three (3) background sampling events conducted in November 2018, June
2019 and December 2019. However, the groundwater samples will continue to be analyzed for 1,4-dioxane
(non-SIM) during the routine Appendix I VOC analysis (EPA Method 8260D; MDL = 13ug/l and PQL = 50
ug/l), for continued monitoring purposes.
Page | 4

3.0 GROUNDWATER MONITORING ACTIVITIES

On December 29, 2022, BEI conducted the second semi-annual 2022 groundwater monitoring event at the
subject site. Groundwater monitoring activities were conducted at three shallow groundwater monitor wells
MW-12, MW-13 and MW-14. Monitor well MW-12 is an upgradient background well and the remaining wells
are downgradient compliance wells.

Prior to conducting the sampling activities, groundwater levels were obtained from each well with a depth-to-
water electrode to the nearest 0.01 foot. Following the gauging activities, each well was purged of three well
bore volumes of water or until dryness with an appropriately decontaminated Teflon bailer attached to new
nylon rope. Purge water was poured on the ground surface at respective well heads. Field parameters including
pH, conductivity and temperature were collected following purging at each well by Buxton Environmental, Inc.
utilizing a calibrated HANNA GroLine meter. Groundwater gauging and field parameter data are provided in
Table 1.

The groundwater samples were analyzed for Appendix I VOCs by EPA Method 8260D (plus tetrahydrofuran
and 1,4-dioxane (non-SIM)) and RCRA metals (excluding mercury) by EPA Methods 6020B. Mercury was
not analyzed due to an oversight by the laboratory. However, mercury has not been detected above the MDL in
any of the C&D landfill groundwater sample since at least 2017. For quality control purposes, an equipment
blank were analyzed for Appendix I VOCs (plus tetrahydrofuran and 1,4-dioxane (non-SIM)) by EPA Method
8260D. The equipment blank was prepared in the field by pouring laboratory supplied de-ionized water
through a decontaminated Teflon bailer into the sample containers. The samples were analyzed by Pace
Analytical Services, LLC (South Carolina License # 329) in West Columbia, South Carolina. The samples
were collected in general accordance with NCSWS protocol, immediately poured into laboratory supplied
containers, appropriately labeled (with sample identification, sample depth, date and time), placed in a cooler
with wet ice, transferred to the laboratory with chain-of-custody documentation.

During the groundwater sampling activities, BEI conducted a routine up-keep and maintenance inspection at
on-site monitor wells, in order to comply with the March 23, 2017 memorandum from the NCSWS. The
monitor wells were locked, appeared to be in good condition, and in compliance with NCSWS standards.

Page | 5

4.0 SHALLOW GROUNDWATER FLOW DIRECTION

Based on groundwater levels obtained during the second semi-annual 2022 event, shallow groundwater flow at
the closed C&D landfill is to the south southwest. A shallow groundwater flow direction map is provided in
Figure 3.

The horizontal hydraulic gradient observed between shallow monitor wells MW-12 and MW-13 was 0.036 feet
per feet (ft/ft).

Page | 6

5.0 GROUNDWATER ANALYTICAL RESULTS

The groundwater analytical results for the second semi-annual 2022 event are presented in Table 2 and are
illustrated in Figure 3. Historical groundwater analytical results are presented in Tables 3, 4 and 5. Laboratory
data sheets are presented in Appendix A. A summary of the groundwater analytical results is provided below.

Groundwater samples collected at monitor wells MW-12, MW-13 and MW-14 did not indicate the presence of
target Appendix I VOCs (including tetrahydrofuran and 1,4-dioxane (non-SIM)) or RCRA metals above
NCGPSs.

No first-time exceedances of target constituents were detected above NCGPSs at monitor wells MW-12, MW-
13 and MW-14 during the second semi-annual 2022 event, therefore, a 14-Day Notification of Groundwater
Protection Standards Exceedance form is not required to be submitted to the NCSWS.

The equipment blank indicated the presence of 2.1 ug/l methylene chloride, which appears to be due to
laboratory contamination.
Page | 7

6.0 CONCLUSIONS

On December 29, 2022, BEI conducted the second semi-annual 2022 groundwater monitoring event at the
Gaston County Closed C&D Landfill - Hardin Site (Permit No.: 36-06) located at 3155 Philadelphia Church
Road in Dallas, North Carolina. Groundwater monitoring activities were conducted at three shallow
groundwater monitor wells MW-12, MW-13 and MW-14. A summary of the findings of this investigation is
provided below.

• On March 13, 2023, the NCSWS issued a memorandum requiring PFAS analyses during groundwater,
surface water and leachate monitoring conducted after July 1, 2023 at all landfills regulated under 15A
NCAC 13B Rules: 0601 and .0602 (all other landfills not regulated under .0531-0546 and .1600 rules);
.0544 and .0545 (C&D landfills); and .1623, and .1630 - .1637 (Subtitle D lined MSW landfills).
According to the memo, PFAS include a group of manufactured compounds used in aerospace,
automotive, textiles, electronics, food packaging, stain-repellent products, non-stick products and
firefighting foams that do not breakdown in the environment and bioaccumulate in humans and animals
through soil and drinking water and are linked to adverse health effects. On July 20, 2023, Mr. Perry
Sugg (NCSWS - Environmental Compliance Branch Head), clarified that PFAS monitoring was also
required at old closed MSW landfills that fall under old NCSWS Rule .0500 that defaults to North
Carolina 2L groundwater monitoring rules. Water samples should be analyzed by EPA (Draft) Method
1633 (PFAS) by a DOD accredited laboratory.

• On July 17, 2023, the NCSWS issued a memorandum clarifying PFAS monitoring requirements at solid
waste sanitary landfills. The letter addresses landfill types that should comply; monitoring frequency
(minimum of two (2) consecutive sample events, after which the data will be evaluated for future
continued monitoring requirements); sampling methodology (including sampling practices and
precautions to avoid equipment cross-contamination); analytical method and laboratories (EPA (Draft)
Method 1633 for up to 40 PFAS compounds by a DOD accredited laboratory); monitoring locations
(groundwater wells, surface water locations, underdrains (French drains) and leachate); and reporting
(routine report preparation and submittal, along with EDD requirements in the EQUIS format).

• During the groundwater sampling activities, BEI conducted a routine up-keep and maintenance
inspection at on-site monitor wells, in order to comply with the March 23, 2017 memorandum from the
NCSWS. The monitor wells were locked, appeared to be in good condition, and in compliance with
NCSWS standards.

• Shallow groundwater flow at the closed C&D landfill is to the south southwest. The horizontal
hydraulic gradient observed between shallow monitor wells MW-12 and MW-13 was 0.036 feet per feet
(ft/ft).

• Groundwater samples collected at monitor wells MW-12, MW-13 and MW-14 did not indicate the
presence of target Appendix I VOCs (including tetrahydrofuran and 1,4-dioxane (non-SIM)) or RCRA
metals above NCGPSs.

• No first-time exceedances of target constituents were detected above NCGPSs at monitor wells MW-12,
MW-13 and MW-14 during the second semi-annual 2022 event, therefore, a 14-Day Notification of
Groundwater Protection Standards Exceedance form is not required to be submitted to the NCSWS.

Page | 8

7.0 RECOMMENDATIONS

Based on the findings of this assessment, BEI makes the following recommendations.

• Semi-annual groundwater monitoring should continue to be conducted at the Gaston County Closed C&D
landfill, in general accordance with NCSWS rules and guidelines. The next monitoring event is anticipated
to be conducted in September 2023, and the groundwater samples will be analyzed for Appendix I VOCs
(including tetrahydrofuran and 1,4-dioxane (non-SIM)), RCRA metals and PFAS (EPA Method 1633, new
requirement).

• The analysis of 1,4-dioxane (by EPA SIM) is recommended to continue to be discontinued during routine
semi-annual monitoring at monitor wells MW-12, MW-13 and MW-14, in accordance with the new
NCSWS policy that allows 1,4-dioxane (SIM) to be eliminated/reduced from the sampling protocol
following two (2) consecutive events with below MDL results. However, these groundwater samples will
continue to be analyzed for 1,4-dioxane (non-SIM) as part of the standard Appendix I VOC analysis (by
EPA Method 8260D; MDL = 13ug/l and PQL = 50 ug/l), for continued monitoring purposes

• A copy of this report should be forwarded to the NCSWS for their review.

FIGURES

TABLES
TABLE 1
GROUNDWATER GAUGING AND FIELD PARAMETER DATA
SECOND SEMI-ANNUAL 2022
GASTON COUNTY CLOSED CONSTRUCTION AND DEMOLITION LANDFILL
PERMIT NO.: 36-06
3155 PHILADELPHIA CHURCH ROAD
DALLAS, NORTH CAROLINA
Well Latitude Longitude Drilling Install TD TD Screen Screen Sand Bentonite Grout Ground TOC DTW DTW
ID (degrees)(degrees)Company Date BTOC BGS Length Depth BGS BGS BGS BGS ElevationElevation BTOC Elevation pH (standard units)K T
(ft)(ft)(ft)(ft)(ft)(ft)(ft)(ft)(ft)(ft)(ft)(standard units)(uS/cm)(Celcius)
MW-12 35.390520 -81.177815 ECS 6-9-95 54.80 50 15 35-50 33-50 31-33 0-31 --774.67 49.99 724.68 5.76 170 16.9
MW-13 35.388152 -81.178079 ECS 5-8-95 25.50 25 15 10-25 8-25 6-8 0-6 --707.31 13.75 693.56 5.68 100 15.6
MW-14 35.388465 -81.179003 ECS 5-8-95 31.92 30 20 10-30 8-30 6-8 0-6 --712.59 17.13 695.46 5.39 180 16.8
Notes:
Depth to water measurements obtained on December 29, 2022 to the nearest 0.01 foot with a depth to water meter.
TD=total depth;BTOC=below top of casing;TOC=top of casing;DTW=depth to water;ft=feet
Field parameters collected during groundwater sampling activities with a calibrated HANNA Instuments GroLine meter.
T=temperature;K=conductivity
uS/cm = microsiemens per centimeter
Latitude and longitude determined from HDR base maps for the subject site.
"--" = no data
rk:table:GasCDGaug.1222
Field Parameters
TABLE 2
GROUNDWATER ANALYTICAL RESULTS
SECOND SEMI-ANNUAL 2022
GASTON COUNTY CLOSED CONSTRUCTION AND DEMOLITION LANDFILL
PERMIT NO.: 36-06
3155 PHILADELPHIA CHURCH ROAD
DALLAS, NORTH CAROLINA
Sample ID Appendix I VOCs (EPA 8260D)EPA 8260D (SIM) RCRA Metals (EPA 6020B)
Acetone 1,4-Dioxane Tetrahydrofuran 1,4-Dioxane Ba Cd Cr Hg Pb Se
LOQ 20 50 5 1 5 0.5 0.5 0.2 1 5
MDL 5 13 1 3 1.3 0.13 0.13 0.091 0.25 1.3
MW-12 BDL BDL BDL NT 70 BDL BDL NT BDL BDL
MW-13 5JL BDL BDL NT 64 0.19J 3.9J NT 3.5 1.4J
MW-14 BDL BDL BDL NT 150 BDL BDL NT BDL BDL
NCGPS 6,000 3 NS 3 700 2 10 1 15 20
Notes:
Groundwater samples collected on December 29, 2022 and analyzed for Appendix I volatile organic compounds (VOCs) (plus tetrahydrofuran and 1,4-dioxane)
by EPA Method 8260D and RCRA metals by EPA 6020B (Mercury was not analyzed).
Analyses by Pace Analytical Services, LLC (NC Certification No.: 329) in West Columbia, SC.
THF = tetrahyrofuran; As = arsenic; Ba=barium; Cd = cadmium; Cr = chromium; Hg = mercury; Pb = lead; Se = selenium
Groundwater sample collected after purging 3 well volumes of water or until dryness with a disposable PVC bailer and new nylon string.
NCGPS=North Carolina Groundwater Protection Standard (April 11, 2022). Remaining Appendix I metals Sb, Be, Co, Cu, Ni, Tl, V and Zn were BDL or below NCGPSs.
LOQ = limit of quantitation (aka: report limit (RL) or practical quantitation limit (PQL)) is the lowest quantitation limit attainable by the EPA method
MDL = method detection limit is the lowest qualified limit (estimated result) attainable by the EPA method
BDL = Below Detection Limit
NT = not tested
Bold and shade denotes groundwater sample above established NCGPS (J-flagged data not considered).
data presented in micrograms per liter (ug/l)
B = detected in method blank
J = estimated result <LOQ or PQL and >=MDL (According to NCAC Title 15A Subchapter 2L North Carolina Groundwater Quality Standards
(primary standard used to establish NCGPS's) dated April 1, 2022, J-flagged groundwater data exceeding the standard does not constitute an exceedance).
L = laboratory control sample (LCS)/laboratory control sample duplicate (LCSD) failure
TABLE 3
HISTORICAL GROUNDWATER ANALYTICAL RESULTS
MW-12
GASTON COUNTY CLOSED CONSTRUCTION AND DEMOLITION LANDFILL
PERMIT NO.: 36-06
3155 PHILADELPHIA CHURCH ROAD
DALLAS, NORTH CAROLINA
Date EPA 8260 (SIM)RCRA Metals
Acetone 2-Butanone CD 1,4-Dioxane As Ba Cd Cr Pb Hg Se Ag
6/16/95 BDL BDL BDL NT BDL 459 1 10 36 BDL BDL BDL
5/16/00 BDL BDL BDL NT BDL 90 BDL BDL BDL BDL BDL BDL
12/8/00 BDL BDL BDL NT 9 273 BDL 10 31 BDL BDL BDL
4/6/01 BDL BDL BDL NT BDL 83 BDL BDL BDL BDL BDL BDL
10/12/01 BDL BDL BDL NT BDL 122 BDL BDL 3 BDL BDL BDL
4/15/02 BDL BDL BDL NT BDL 92 BDL BDL BDL BDL BDL BDL
10/2/02 BDL BDL BDL NT 28 1,400 1.4 49 230 BDL BDL BDL
4/9/03 BDL BDL BDL NT BDL 160 BDL BDL 5.1 BDL BDL BDL
10/2/03 BDL BDL BDL NT BDL 63 BDL BDL BDL BDL BDL BDL
4/1/04 BDL BDL BDL NT 6 330 BDL 7.9 39 BDL BDL BDL
10/13/04 BDL BDL BDL NT BDL 270 2.3 BDL 9.8 BDL BDL BDL
4/12/05 BDL BDL BDL NT BDL 110 BDL BDL BDL BDL BDL BDL
10/24/05 BDL BDL 1.9 NT BDL 130 BDL BDL 7.5 BDL BDL BDL
5/8/06 BDL BDL BDL NT BDL 120 BDL BDL BDL BDL BDL BDL
11/25/06 BDL BDL BDL NT BDL 77 2.8 BDL BDL BDL BDL BDL
5/30/07 BDL BDL BDL NT BDL 72 BDL BDL BDL BDL BDL BDL
11/13/07 1.3J BDL BDL NT 4.1J 91 BDL 2.5J BDL BDL 2.8J BDL
6/1/08 BDL BDL BDL NT BDL 97 BDL 2.6J 3.8 BDL BDL 0.5BJ
12/1/08 BDL BDL BDL NT BDL 76 BDL BDL BDL BDL BDL BDL
6/22/09 BDL BDL BDL NT BDL 88 BDL BDL 5.9BJ BDL BDL BDL
11/19/09 BDL BDL 0.15J NT BDL 88 BDL BDL BDL BDL BDL 0.41J
4/8/10 BDL BDL BDL NT BDL 88 0.98J BDL 7J BDL BDL BDL
11/22/10 BDL BDL BDL NT BDL 85 0.82J BDL 3.8BJ BDL BDL BDL
5/23/11 BDL BDL BDL NT BDL 78 BDL BDL 3.4BJ BDL BDL BDL
12/5/11 BDL BDL BDL NT BDL 71 0.87J BDL BDL 0.076BJ BDL BDL
5/29/12 BDL BDL BDL NT BDL 72 BDL BDL 4.3J BDL BDL BDL
12/13/12 BDL BDL BDL NT BDL 70 BDL BDL BDL BDL BDL BDL
5/20/13 BDL BDL BDL NT 6.1J 79 BDL BDL 2J BDL BDL BDL
11/22/13 BDL BDL BDL NT BDL 89 BDL BDL BDL BDL BDL BDL
5/15/14 BDL BDL BDL NT 11 80 BDL BDL 3.2BJ BDL BDL BDL
12/17/14 BDL BDL BDL NT BDL 85 BDL BDL 5.4J 0.022J BDL BDL
5/14/15 BDL BDL BDL NT 2.9J 81 2 1.9J BDL BDL BDL BDL
12/7/15 BDL BDL BDL NT BDL 94 0.6J 1.7J BDL BDL BDL BDL
5/9/16 BDL BDL BDL NT BDL 92 0.69 2.4J 4 BDL BDL BDL
12/13/16 2J BDL 0.76J NT BDL 94B 1.4 BDL 1.7B BDL BDL BDL
7/20/17 BDL BDL BDL NT BDL 100 0.25J 1.7J 3.5 0.11 BDL BDL
11/30/17 2.3J BDL BDL NT BDL 110 5.3 3.9J 5.9 BDL BDL BDL
6/4/18 2.4J BDL BDL NT BDL 140 0.14J 4.4J 9.9 BDL BDL BDL
11/14/18 BDL BDL BDL BDL 0.42J 110 0.15J 3.2 4.8 BDL BDL BDL
6/4/19 BDL BDL BDL BDL BDL 1,200 1.1 24 120 BDL 1.7J BDL
12/2/19 BDL BDL BDL BDL BDL 100 0.26J 1.8J 4.4 BDL BDL BDL
8/5/20 BDL 2.7J BDL NT BDL 71 0.29J 1.3J 1.1 BDL BDL BDL
12/22/20 BDL BDL BDL NT BDL 85 0.2J 1.7J 2.6 BDL BDL BDL
8/28/21 BDL BDL BDL NT BDL 66 0.31J BDL BDL BDL BDL BDL
12/28/21 BDL BDL BDL NT BDL 94 0.18J 1.4J 3.1 BDL BDL BDL
8/15/22 BDL BDL 0.48J NT BDL 70 0.35J BDL 0.25J BDL BDL BDL
12/29/22 BDL BDL BDL NT BDL 70 BDL BDL BDL NT BDL BDL

NCGPS 6,000 4,000 700 3 10 700 2 10 15 1 20 20
Notes:
Groundwater samples collected by Resolve Environmental Services, P.A. on June 16, 1995Remaining groundwater samples collected by Buxton Environmental, Inc.
BDL = Below Detection Limit A = Acetone; CD = carbon disulfide; As = arsenic; Ba = barium; Cd = cadmium; Cr = chromium; Pb = lead; Hg = mercury; Se = selenium; Ag = silver
SIM = select ion monitoringNCGPS=North Carolina Groundwater Protection Standard (April 11, 2022)
VOCs = Volatile Organic CompoundsData presented in micrograms per liter (ug/l)
Bold and shade denotes above NCGPSJ = estimated result <LOQ or PQL and >=MDL (According to NCAC Title 15A Subchapter 2L North Carolina
Groundwater Quality Standards (primary standard used to establish NCGPS's) dated April 1, 2022, J-flagged groundwater data exceeding the standard does not constitute an exceedance).B = detected in method blank
NT = not tested
Appendix I VOCs
TABLE 4
HISTORICAL GROUNDWATER ANALYTICAL RESULTS
MW-13
GASTON COUNTY CLOSED CONSTRUCTION AND DEMOLITION LANDFILL
PERMIT NO.: 36-06
3155 PHILADELPHIA CHURCH ROAD
DALLAS, NORTH CAROLINA
Date Appendix I VOCs EPA 8260 (SIM)RCRA Metals
Acetone CD 1,1-DCE Tolune TCFM VC 1,4-Dioxane As Ba Cd Cr Pb Hg Se Ag
6/16/95 BDL BDL BDL BDL BDL BDL NT BDL 516 2 12 40 BDL BDL BDL
5/16/00 BDL BDL BDL BDL BDL BDL NT BDL 159 BDL 7 10 BDL BDL BDL
12/8/00 BDL BDL BDL BDL BDL BDL NT BDL 273 BDL 10 16 BDL BDL BDL
4/6/01 BDL BDL BDL BDL BDL BDL NT BDL 77 BDL BDL BDL BDL BDL BDL
10/12/01 BDL BDL BDL BDL 2.5 BDL NT BDL 406 BDL 12 20 BDL BDL BDL
4/15/02 BDL BDL BDL BDL 2.7 BDL NT BDL 94 BDL BDL BDL BDL BDL BDL
10/2/02 BDL BDL BDL BDL BDL BDL NT BDL 75 BDL BDL BDL BDL BDL BDL
4/9/03 BDL BDL BDL BDL 2.4 BDL NT BDL 210 BDL 15 BDL 0.16 BDL BDL
10/2/03 BDL BDL BDL BDL 2.4 BDL NT BDL 190 BDL BDL 4.7 0.34 BDL BDL
4/1/04 BDL BDL BDL BDL BDL BDL NT BDL 200 BDL 7.2 4 2.3 BDL BDL
10/13/04 BDL BDL BDL BDL BDL BDL NT BDL 140 BDL 7 5.7 1.2 BDL BDL
4/12/05 BDL BDL 1.1 BDL BDL 4.7 NT BDL 170 BDL BDL BDL 0.47 BDL BDL
10/24/05 BDL BDL BDL BDL BDL BDL NT BDL 160 BDL BDL BDL 0.8 BDL BDL
5/8/06 BDL BDL BDL BDL BDL BDL NT BDL 160 BDL 5.5 4.6 0.72 BDL BDL
11/25/06 BDL BDL BDL BDL BDL BDL NT BDL 140 BDL BDL 9.5 0.63 BDL BDL
5/30/07 BDL BDL BDL BDL BDL 2.7 NT BDL 79 BDL BDL BDL BDL BDL BDL
11/13/07 BDL BDL BDL BDL BDL BDL NT 4.6J 25 2J 5J BDL 0.1J BDL BDL
6/1/08 BDL BDL BDL BDL BDL BDL NT BDL 71 BDL 2.2J 3.3 BDL BDL 0.6BJ
12/1/08 BDL BDL BDL BDL BDL BDL NT BDL 72 1.3J BDL BDL 0.054J BDL BDL
6/22/09 BDL BDL BDL BDL BDL 0.75J NT BDL 89 BDL BDL 11B BDL BDL BDL
11/19/09 BDL 0.13J BDL BDL BDL 0.6J NT BDL 93 0.74J BDL 2J BDL BDL 0.86J
4/8/10 BDL BDL BDL BDL BDL BDL NT BDL 90 0.72J BDL 11 BDL BDL BDL
11/22/10 BDL BDL BDL BDL BDL BDL NT BDL 93 BDL BDL 3.1BJ 0.13 BDL BDL
5/23/11 BDL BDL BDL BDL BDL BDL NT 19 590 BDL 7 70B 0.065J BDL 1.4BJ
12/5/11 BDL BDL BDL BDL BDL BDL NT 5.8J 140 BDL 3.9J 24 BDL BDL BDL
5/29/12 BDL BDL BDL BDL BDL BDL NT BDL 93 0.87J 2.2J 11 BDL BDL BDL
12/13/12 BDL BDL BDL BDL BDL BDL NT BDL 89 BDL BDL BDL BDL 2.6BJ BDL
5/20/13 BDL BDL BDL BDL BDL BDL NT 24 590 1.9J 28 92 0.05J 4.9J 2
11/22/13 BDL BDL BDL BDL BDL BDL NT 7.5J 440 0.82J 12 42 0.17 BDL BDL
5/15/14 BDL BDL BDL BDL BDL BDL NT 4J 110 BDL BDL 10B 0.022J BDL BDL
12/17/14 BDL BDL BDL BDL BDL BDL NT BDL 110 1J BDL 9.5J BDL BDL BDL
5/14/15 BDL BDL BDL BDL BDL BDL NT 5.4J 81 0.8 1.8J BDL BDL BDL BDL
12/7/15 BDL BDL BDL BDL BDL BDL NT 18 350 1J 20 68 BDL BDL BDL
5/9/16 BDL BDL BDL BDL BDL BDL NT 1.4 140 0.32 2.5J 20 BDL BDL BDL
12/13/16 BDL 0.76J BDL BDL BDL BDL NT 2.3B 110B 0.66 2.6J 4.8B 0.036J BDL BDL
7/20/17 BDL BDL BDL BDL BDL BDL NT 1.7J 130 0.34J 2.7J 7.8 BDL BDL BDL
11/30/17 BDL BDL BDL BDL BDL BDL NT BDL 110 0.41J 2.4J 3.2 BDL BDL BDL
6/4/18 BDL 2.6J BDL BDL BDL BDL NT 4.7 240 0.71 9.6 31 BDL BDL BDL
11/14/18 BDL BDL BDL BDL BDL BDL BDL 2 75 0.24J 6.7 8.8 BDL 0.65J BDL
6/4/19 2.6J BDL BDL 0.52J BDL BDL BDL 2.2 BDL BDL 2.3J 5.5 BDL BDL BDL
12/2/19 BDL BDL BDL BDL BDL BDL BDL BDL 89 BDL BDL 0.47J BDL BDL BDL
8/5/20 BDL BDL BDL BDL BDL BDL NT 1.8J 91 0.37J 1.4J 3.8 BDL BDL BDL
12/22/20 BDL BDL BDL BDL BDL BDL NT BDL 67 BDL 3.8J 2.5 BDL BDL BDL
8/28/21 BDL BDL BDL BDL BDL BDL NT BDL 130 0.18J BDL 1.1 BDL BDL BDL
12/28/21 BDL BDL BDL BDL BDL BDL NT BDL 99 0.28J BDL 0.83J BDL BDL BDL
8/15/22 BDL BDL BDL BDL BDL BDL NT BDL 70 0.27J BDL 0.87J BDL BDL BDL
12/29/22 5JL BDL BDL BDL BDL BDL NT BDL 64 0.19J 3.9J 3.5 NT 1.4J BDL
NCGPS 6,000 700 7 6,000 2,000 0.03 3 10 700 2 10 15 1 20 20
Notes:
Groundwater samples collected by Resolve Environmental Services, P.A. on June 16, 1995Remaining groundwater samples collected by Buxton Environmental, Inc.BDL = Below Detection Limit
CD = carbon disulfide; DCE = dichloroethene; TCFM = trichlorofluoromethane; VC = vinyl chloride; As = arsenic; Ba = barium; Cd = cadmium; Cr = chromium; Hg = mercury; Pb = lead; Ag = silver
SIM = select ion monitoringNCGPS=North Carolina Groundwater Protection Standard (April 11, 2022)
VOCs = Volatile Organic CompoundsData presented in micrograms per liter (ug/l)
Bold and shade denotes above NCGPS; B = detected in method blank; NT = not testedJ = estimated result <LOQ or PQL and >=MDL (According to NCAC Title 15A Subchapter 2L North Carolina Groundwater Quality Standards (primary standard used to establish NCGPS's) dated April 1, 2022, J-flagged
groundwater data exceeding the standard does not constitute an exceedance).L = laboratory control sample (LCS)/laboratory control sample duplicate (LCSD) failure
TABLE 5
HISTORICAL GROUNDWATER ANALYTICAL RESULTS
MW-14
GASTON COUNTY CLOSED CONSTRUCTION AND DEMOLITION LANDFILL
PERMIT NO.: 36-06
3155 PHILADELPHIA CHURCH ROAD
DALLAS, NORTH CAROLINA
Date EPA 8260 (SIM)RCRA Metals
A B CA CF 1,1-1,1-cis-1,2-MC PCE TCE THF VC X 1,4-Dioxane As Ba Cd Cr Pb Hg Se Ag
DCA DCE DCE
6/16/95 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL NT BDL BDL NT BDL 1,171 11 256 78 BDL BDL BDL
5/16/00 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL NT BDL BDL NT BDL 115 BDL 27 9 BDL BDL BDL
12/8/00 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL NT BDL BDL NT 10 819 1 222 64 BDL 6 BDL
4/6/01 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL NT BDL BDL NT 5 52 BDL BDL BDL BDL BDL BDL
10/12/01 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL NT BDL BDL NT BDL 222 9 54 12 BDL BDL BDL
4/15/02 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL NT BDL BDL NT BDL 51 BDL 6 BDL BDL BDL BDL
10/2/02 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL NT BDL BDL NT 14 2,600 BDL 570 250 BDL BDL BDL
4/9/03 BDL BDL BDL 1.5 BDL BDL BDL BDL BDL BDL NT BDL BDL NT BDL 180 BDL 15 8.6 BDL BDL BDL
10/2/03 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL NT BDL BDL NT BDL 200 BDL 7.8 5 BDL BDL BDL
4/1/04 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL NT BDL BDL NT 7.1 610 BDL 150 34 BDL BDL BDL
10/13/04 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL NT 2.2 BDL NT BDL 570 BDL 58 23 BDL BDL BDL
4/12/05 BDL BDL BDL BDL BDL 2.8 BDL BDL BDL BDL NT 8.6 BDL NT BDL 220 BDL 13 BDL BDL BDL BDL
10/24/05 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL NT BDL BDL NT BDL 280 BDL 21 3.4 BDL BDL BDL
5/8/06 BDL BDL BDL BDL BDL 3.4 BDL BDL BDL BDL NT 3.5 BDL NT BDL 280 BDL 26 7.8 BDL BDL BDL
11/25/06 BDL BDL BDL 1 BDL BDL BDL BDL BDL BDL NT BDL BDL NT BDL 330 2.1 37 10 BDL BDL BDL
5/30/07 BDL BDL BDL BDL BDL 1.3 BDL BDL BDL BDL NT 27 BDL NT BDL 260 7 5.7 BDL BDL BDL BDL
11/13/07 BDL 0.14J 0.82J BDL 0.31J 1.7 0.15J 0.77J 0.15J 0.46J NT BDL 0.54J NT BDL 250 BDL 9 BDL BDL BDL BDL
6/1/08 BDL 0.14J BDL BDL BDL 0.56J 0.2J BDL BDL 0.32J NT 0.99J 0.44J NT BDL 220 0.6J 6 1.9J BDL BDL BDL
12/1/08 BDL BDL BDL 0.64J BDL 0.52J 0.26J 0.65J BDL 0.33J NT 2.6 0.43J NT BDL 200 BDL BDL BDL 0.059J BDL BDL
6/22/09 BDL 0.15J BDL BDL 0.45J 0.42J 0.21J BDL BDL 0.26J NT 21 0.36J NT BDL 280 BDL 8 8.9BJ 0.098J BDL BDL
11/19/09 BDL BDL BDL BDL BDL 0.35J 0.2J 0.75J BDL 0.22J NT 21 BDL NT BDL 210 0.7J 3 3 BDL BDL BDL
4/8/10 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL NT BDL BDL NT BDL 220 1.3J 6 10 BDL BDL BDL
11/22/10 BDL BDL BDL 1.1 0.66J 1.3 0.33J BDL BDL BDL NT 15 BDL NT BDL 170 BDL BDL 4.1BJ BDL BDL BDL
5/23/11 BDL BDL BDL 0.36J BDL BDL BDL 0.67J BDL BDL NT BDL BDL NT BDL 180 BDL BDL 9BJ BDL BDL 0.59BJ
12/5/11 BDL 0.13J BDL 0.63J 0.37J 0.65J 0.22J BDL BDL BDL BDL 26 BDL NT BDL 160 BDL BDL BDL 0.098BJBDL BDL
5/29/12 BDL 0.13J BDL BDL BDL BDL 0.12J BDL BDL BDL BDL 5.8 BDL NT BDL 170 BDL 3.3J 12 BDL BDL BDL
12/13/12 BDL BDL BDL 0.99J BDL BDL 0.23J BDL BDL BDL BDL 0.56J BDL NT BDL 180 BDL 4.3J BDL BDL BDL BDL
5/20/13 BDL 0.18J BDL BDL 0.3J 0.25J 0.25J 0.33J BDL 0.19J 2.8J 15 BDL NT BDL 200 BDL 4.8J BDL 0.043J BDL 0.52J
11/22/13 BDL BDL BDL 0.64J 0.32J 0.22J 0.25J BDL BDL 4.7J BDL 18 BDL NT BDL 220 BDL 7 6.4J 0.036J BDL BDL
5/15/14 BDL BDL BDL 0.7J 0.18J 0.39J BDL BDL BDL BDL 3.5J 17 BDL NT 7.3J 190 BDL 2.2J 2.7BJ 0.022J BDL BDL
12/30/14 BDL BDL BDL 0.44J 0.14J 0.23J 0.28J BDL BDL BDL 4.9J 12 BDL NT BDL 180 BDL BDL 2.6J BDL BDL BDL
5/14/15 BDL BDL BDL 0.13J BDL BDL 0.18J BDL BDL BDL 4.8J 2.6 BDL NT 3.7J 170 BDL 3.5J BDL BDL BDL BDL
12/7/15 BDL BDL BDL 0.22BJ BDL 0.37J 0.25J BDL BDL BDL 7.8 8.8 BDL NT BDL 220 BDL 1.7J BDL BDL BDL BDL
5/9/16 BDL BDL BDL 0.22J BDL BDL BDL BDL BDL BDL BDL 14 BDL NT BDL 190 0.32 2.2J 0.72J BDL BDL BDL
12/13/16 BDL BDL BDL 0.5J BDL BDL BDL BDL BDL BDL 7.2 12 BDL NT BDL 240B 0.55 BDL 0.49BJ BDL BDL BDL
7/20/17 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 11 4.4 BDL NT BDL 230 BDL 3.1J 0.88J BDL BDL BDL
11/30/17 2J BDL BDL BDL BDL BDL BDL BDL BDL BDL 8.3 1.4 BDL NT BDL 230 0.4J 2.2J 0.47J BDL BDL BDL
6/4/18 2.2J BDL BDL BDL BDL BDL BDL BDL BDL BDL 6.7 BDL BDL NT BDL 180 0.28J 3.3J 0.68J BDL BDL BDL
11/14/18 BDL BDL BDL 1.1 BDL BDL 0.4J 0.4J BDL BDL 8.8J BDL BDL BDL 0.28J 200 0.15J 1.1 0.4J BDL BDL BDL
6/4/19 BDL BDL BDL 0.58J BDL BDL BDL BDL BDL BDL 3.2J BDL BDL BDL BDL 160 BDL 1.3J 0.35J BDL BDL BDL
12/2/19 BDL BDL BDL 0.55J BDL 0.45J BDL BDL BDL BDL 2.7J 21 BDL BDL BDL 170 0.21J 1.3J 0.29J BDL BDL BDL
8/5/20 BDL BDL BDL 1.5 BDL BDL BDL BDL BDL BDL BDL BDL BDL NT BDL 160 0.29J BDL 0.35J BDL BDL BDL
12/22/20 BDL BDL BDL 1.5H BDL BDL BDL BDL BDL BDL BDL BDL BDL NT BDL 170 BDL 2.4J 0.55J BDL BDL BDL
8/28/21 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL NT BDL 170 0.43J BDL 0.43J BDL BDL BDL
12/28/21 BDL BDL BDL 0.99J BDL BDL BDL BDL BDL BDL BDL BDL BDL NT BDL 170 0.19J BDL 0.46J BDL BDL BDL
8/15/22 BDL BDL BDL 0.51J BDL BDL BDL BDL BDL BDL BDL BDL BDL NT BDL 160 BDL BDL BDL BDL BDL BDL
12/29/22 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL NT BDL 150 BDL BDL BDL NT BDL BDL

NCGPS 6,000 1 3,000 70 6 7 70 5 0.7 3 NS 0.03 500 3 10 700 2 10 15 1 20 20
Notes:
Groundwater samples collected by Resolve Environmental Services, P.A. on June 16, 1995Remaining groundwater samples collected by Buxton Environmental, Inc.BDL = Below Detection Limit
A = acetone; B = benzene; CA = chloroethane; CF = chloroform; DCA = dichloroethane; DCE = dichloroethene; MC = methylene chloride; PCE = tetrachloroethene; TCE = trichloroethene; THF = tetrahydrofuran; VC = vinyl chloride; X = xylenes; As = arsenic; Ba = barium; Cd = cadmium;
Cr = chromium; Hg = mercury; Pb = lead; Se = selenium; Ag = silverSIM = select ion monitoring
NCGPS=North Carolina Groundwater Protection Standard (April 11, 2022)VOCs = Volatile Organic Compounds
Data presented in micrograms per liter (ug/l)Bold and shade denotes above NCGPSJ = estimated result <LOQ or PQL and >=MDL (According to NCAC Title 15A Subchapter 2L North Carolina
Groundwater Quality Standards (primary standard used to establish NCGPS's) dated April 1, 2022, J-flagged groundwater data exceeding the standard does not constitute an exceedance).
B = detected in method blankNT = not tested; H = analyzed out of EPA Method holding time
Appendix I VOCs

APPENDIX A.
NCSWS Memorandums – PFAS Monitoring – March 13, 2023 and July 17, 2023

APPENDIX B.
Laboratory Data Sheets
The electronic signature above is the equivalent of a handwritten signature.
This report shall not be reproduced,except in its entirety,without the written approval of Pace Analytical Services,LLC.
Pace Analytical Services,LLC (formerly Shealy Environmental Services,Inc.)
106 Vantage Point Drive West Columbia,SC 29172
Tel:[phone] Fax:[phone] www.pacelabs.com
Report of Analysis
Buxton Environmental
PO Box 11550
Charlotte,NC 28220
Attention:Ross Klingman
Project Name:Gaston Co Unit II MSW Landfill-Hardin Site
Project Number:3606
Lot Number:XL31002
Date Completed:01/12/2023
Revision Date:09/20/2023
09/25/2023 5:52 PM
Approved and released by:
Project Manager II:Cathy S.Dover
Page 1 of 104
PACE ANALYTICAL SERVICES,LLC
SC DHEC No:32010001 NELAC No:E87653 NC DENR No:329 NC Field Parameters No:5639
Pace Analytical Services,LLC (formerly Shealy Environmetal Services,Inc.)
106 Vantage Point Drive West Columbia,SC 29172 [phone] Fax [phone] www.pacelabs.com
Case Narrative
Buxton Environmental
Lot Number:XL31002
Report Revision:Per client,this report has been revised to update the element list for samples
MW-12 (XL31002-012),MW-13 (XL31002-013)and MW-14 (XL31002-014).They were inadvertently
reported as same list as the metals on the other COC/sample received and now are reported with
only RCRA metals (minus Hg).This report supersedes and replaces any prior reports issued
under this lot number.
This Report of Analysis contains the analytical result(s)for the sample(s)listed on the Sample Summary
following this Case Narrative.The sample receiving date is documented in the header information
associated with each sample.
All results listed in this report relate only to the samples that are contained within this report.Where
sampling is conducted by the client,results relate to the accuracy of the information provided,and as the
samples are received.
Sample receipt,sample analysis,and data review have been performed in accordance with the most
current approved The NELAC Institute (TNI)standards,the Pace Analytical Services,LLC ("Pace")
Laboratory Quality Manual,standard operating procedures (SOPs),and Pace policies.Any exceptions to
the TNI standards,the Laboratory Quality Manual,SOPs or policies are qualified on the results page or
discussed below.
Pace is a TNI accredited laboratory;however,the following analyses are currently not listed on our TNI
scope of accreditation:Drinking Water:VOC (excluding BTEX,MTBE,Naphthalene,&1,2-
dichloroethane)EPA 524.2,E.coli and Total coliforms SM 9223 B-2004,Solid Chemical Material:TOC
Walkley-Black,Biological Tissue:All,Non-Potable Water:SGT-HEM EPA 1664B,Silica EPA 200.7,
Boron,Calcium,Silicon,Strontium EPA 200.8,Bicarbonate,Carbonate,and Hydroxide Alkalinity SM 2320
B-2011,SM 9221 C E-2006 &SM 9222D-2006,Strontium SW-846 6010D,VOC SM 6200 B-2011,Fecal
Coliform Colilert-18.
VOA 8260D
Insufficient sample volume was provided to perform matrix spike/matrix spike duplicate (MS/MSD)for
analytical batch 64266.An LCS/LCSD was run in lieu of an MS/MSD.Associated samples:
XL31002-001 (MW-1)(Run 1)(Analysis Batch 64266)
XL31002-002 (MW-24)(Run 1)(Analysis Batch 64266)
XL31002-003 (MW-25)(Run 1)(Analysis Batch 64266)
XL31002-004 (MW-26)(Run 1)(Analysis Batch 64266)
XL31002-005 (MW-27)(Run 1)(Analysis Batch 64266)
XL31002-006 (MW-31)(Run 1)(Analysis Batch 64266)
XL31002-007 (US-1)(Run 1)(Analysis Batch 64266)
XL31002-008 (DS-1)(Run 1)(Analysis Batch 64266)
XL31002-009 (Leachate-Unit 2 ph1)(Run 1)(Analysis Batch 64266)
XL31002-010 (Leachate-Unit 2 ph2)(Run 1)(Analysis Batch 64266)
XL31002-011 (Equipment Blank)(Run 1)(Analysis Batch 64266)
XL31002-012 (MW-12)(Run 1)(Analysis Batch 64266)
XL31002-013 (MW-13)(Run 1)(Analysis Batch 64266)
XL31002-014 (MW-14)(Run 1)(Analysis Batch 64266)
Page 2 of 104
PACE ANALYTICAL SERVICES,LLC
SC DHEC No:32010001 NELAC No:E87653 NC DENR No:329 NC Field Parameters No:5639
Pace Analytical Services,LLC (formerly Shealy Environmetal Services,Inc.)
106 Vantage Point Drive West Columbia,SC 29172 [phone] Fax [phone] www.pacelabs.com
The following samples was received with an air bubble in the sample vials:XL31002-009 and XL31002-
010.
XL31002-009 (Leachate-Unit 2 ph1)(Run 1)(Analysis Batch 64266)
XL31002-010 (Leachate-Unit 2 ph2)(Run 1)(Analysis Batch 64266)
XL31002-009 (Leachate-Unit 2 ph1)(Run 1)(Analysis Batch 64266)
XL31002-010 (Leachate-Unit 2 ph2)(Run 1)(Analysis Batch 64266)
The initial calibration verification (ICV)associated with samples XL31002-001,XL31002-002,XL31002-
003,XL31002-004,XL31002-005,XL31002-006,XL31002-007,XL31002-008,XL31002-009,XL31002-
010,XL31002-011,XL31002-012,XL31002-013,and XL31002-014 exceeded control criteria for analyte:
2-hexanone (133%).The data has been reported.
The initial calibration verification (ICV)associated with samples XL31002-001,XL31002-003,XL31002-
004,XL31002-005,XL31002-006,XL31002-007,XL31002-008,XL31002-011,XL31002-012,XL31002-
013,XL31002-014 exceeded control criteria for analytes:Acetone (123%).The data has been reported.
XL31002-001 (MW-1)(Run 1)(Analysis Batch 64266)
XL31002-003 (MW-25)(Run 1)(Analysis Batch 64266)
XL31002-004 (MW-26)(Run 1)(Analysis Batch 64266)
XL31002-005 (MW-27)(Run 1)(Analysis Batch 64266)
XL31002-006 (MW-31)(Run 1)(Analysis Batch 64266)
XL31002-007 (US-1)(Run 1)(Analysis Batch 64266)
XL31002-008 (DS-1)(Run 1)(Analysis Batch 64266)
XL31002-011 (Equipment Blank)(Run 1)(Analysis Batch 64266)
XL31002-012 (MW-12)(Run 1)(Analysis Batch 64266)
XL31002-013 (MW-13)(Run 1)(Analysis Batch 64266)
XL31002-014 (MW-14)(Run 1)(Analysis Batch 64266)
The laboratory control sample (LCS)and laboratory control sample duplicate (LCSD)for analytical batch
64266 exceeded acceptance criteria for the following analytes:Acetone,2-butanone,1,4-dioxane and 2-
hexanone.These analytes were biased high and were not detected in the associated samples,or below
the LOQ:XL31002-001,XL31002-002,XL31002-003,XL31002-004,XL31002-005,XL31002-006,
XL31002-007,XL31002-008,XL31002-009,XL31002-010,XL31002-011,XL31002-012,XL31002-013,
and XL31002-014.The RPD for trans-1,4-Dichloro-2-butene was >20%.
XL31002-001 (MW-1)(Run 1)(Analysis Batch 64266)
XL31002-002 (MW-24)(Run 1)(Analysis Batch 64266)
XL31002-003 (MW-25)(Run 1)(Analysis Batch 64266)
XL31002-004 (MW-26)(Run 1)(Analysis Batch 64266)
XL31002-005 (MW-27)(Run 1)(Analysis Batch 64266)
XL31002-006 (MW-31)(Run 1)(Analysis Batch 64266)
XL31002-007 (US-1)(Run 1)(Analysis Batch 64266)
XL31002-008 (DS-1)(Run 1)(Analysis Batch 64266)
XL31002-011 (Equipment Blank)(Run 1)(Analysis Batch 64266)
XL31002-012 (MW-12)(Run 1)(Analysis Batch 64266)
XL31002-013 (MW-13)(Run 1)(Analysis Batch 64266)
XL31002-014 (MW-14)(Run 1)(Analysis Batch 64266)
Page 3 of 104
PACE ANALYTICAL SERVICES,LLC
SC DHEC No:32010001 NELAC No:E87653 NC DENR No:329 NC Field Parameters No:5639
Pace Analytical Services,LLC (formerly Shealy Environmetal Services,Inc.)
106 Vantage Point Drive West Columbia,SC 29172 [phone] Fax [phone] www.pacelabs.com
Insufficient sample volume was provided to perform matrix spike/matrix spike duplicate (MS/MSD)for
analytical batch 64265.An LCS/LCSD was run in lieu of an MS/MSD.Associated sample:XL31002-015
(FD-1)(Run 1)(Analysis Batch 64265)
Sample XL31002-009 (Leachate-Unit 2 ph1)had a pH of 5 when pH was taken at analysis time.
The LCS/LCSD RPD for 1,4-dioxane in batch 64265 was >20%,but spike recovery was in control limits.
The MS/MSD for batch 64266 and parent sample XL31002-010 (Leachate-Unit 2 ph2),recovered outside
the lower control limit for Acetone.The associated LCS passed acceptance criteria.
The continuing calibration verification (CCV)associated with analytical batch 64265 recovered outside
acceptance criteria,low biased,for Vinyl acetate (-25%).An LOQ standard was analyzed,and the target
analyte was detected.Since the associated sample,XL31002-015 was non-detect,no corrective action
was taken.
XL31002-015 (FD-1)(Run 1)(Analysis Batch 64265)Full list VOCs (with total and separate xylenes,total
ICP Metals 6020B
The following samples were diluted due to the nature of the sample matrix:XL31002-009 and XL31002-
010.The LOQ has been elevated to reflect the dilution.
XL31002-009 (Leachate-Unit 2 ph1)(Run 1)(Analysis Batch 64284)(Prep Batch 63980)ICP-MS Metals
XL31002-010 (Leachate-Unit 2 ph2)(Run 1)(Analysis Batch 64284)(Prep Batch 63980)ICP-MS Metals
Nitrate 353.2
The following samples:XL31002-009 and XL31002-010 (Leachate-Unit 2 ph2)were associated with
analytical batch 63954 that had a LCS that recovered outside XL31002-009 (Leachate-Unit 2 ph1)of
acceptable range,samples were scheduled for a reanalysis.The reanalysis of the samples was
performed outside of the analytical holding time,but this analysis confirmed the original results within 20%
RPD.The original analysis has been reported.
Orthophosphate 365.1
According to the method,orthophosphate samples must be filtered within 15 minutes of collection.No
information was provided stating that the samples in this batch were filtered to meet this requirement.
Therefore,the samples were filtered during sample preparation prior to analysis.Data has been
reported.Associated samples:
XL31002-009 (Leachate-Unit 2 ph1)and XL31002-010 (Leachate-Unit 2 ph2)
XL31002-009 (Leachate-Unit 2 ph1)(Run 1)(Analysis Batch 63953)Orthophosphate
XL31002-010 (Leachate-Unit 2 ph2)(Run 1)(Analysis Batch 63953)Orthophosphate
The limit of quantitation (LOQ)check standard for orthophosphate analytical batch 63953 did not recover
within recovery criteria.The affected samples XL31002-009 and XL31009-010 should be considered
biased high.The samples were reanalyzed and results confirmed.The original in holding time analysis
has been reported.
XL31002-009 (Leachate-Unit 2 ph1)(Run 1)(Analysis Batch 63953)Orthophosphate
XL31002-010 (Leachate-Unit 2 ph2)(Run 1)(Analysis Batch 63953)Orthophosphate
Page 4 of 104
PACE ANALYTICAL SERVICES,LLC
SC DHEC No:32010001 NELAC No:E87653 NC DENR No:329 NC Field Parameters No:5639
Pace Analytical Services,LLC (formerly Shealy Environmetal Services,Inc.)
106 Vantage Point Drive West Columbia,SC 29172 [phone] Fax [phone] www.pacelabs.com
The MS/MSD for batch 63953 and parent sample XL31002-010 (Leachate-Unit 2 ph2),recovered outside
the lower control limit.The associated LCS passed acceptance criteria.The MS/MSD RPD was >20%.
BOD
For samples XL31002-009 and XL31002-010,QC bottles 1,2 and 4-10 for BOD_63955 were recorded
with initial DO values below the criteria minimum of 8.56 mg/L for setup procedure.
XL31002-009 (Leachate-Unit 2 ph1)(Run 1)(Analysis Batch 63955)BOD,5 day
XL31002-010 (Leachate-Unit 2 ph2)(Run 1)(Analysis Batch 63955)BOD,5 day
If you have any questions regarding this report,please contact the Pace Project Manager listed on the
cover page.
Page 5 of 104
PACE ANALYTICAL SERVICES, LLC
Sample Summary
Buxton Environmental
Lot Number: XL31002

Project Name: Gaston Co Unit II MSW Landfill-Hardin Site
Project Number: 3606
Sample Number Sample ID Matrix Date Sampled Date Received
001 12/29/2022 1430MW-1 Aqueous 12/31/2022
002 12/30/2022 1100MW-24 Aqueous 12/31/2022
003 12/30/2022 1000MW-25 Aqueous 12/31/2022
004 12/29/2022 1600MW-26 Aqueous 12/31/2022
005 12/29/2022 1530MW-27 Aqueous 12/31/2022
006 12/29/2022 1500MW-31 Aqueous 12/31/2022
007 12/29/2022 1145US-1 Aqueous 12/31/2022
008 12/30/2022 1330DS-1 Aqueous 12/31/2022
009 12/30/2022 1030Leachate-Unit 2 ph1 Aqueous 12/31/2022
010 12/30/2022 1115Leachate-Unit 2 ph2 Aqueous 12/31/2022
011 12/30/2022 1535Equipment Blank Aqueous 12/31/2022
012 12/29/2022 1215MW-12 Aqueous 12/31/2022
013 12/29/2022 1330MW-13 Aqueous 12/31/2022
014 12/29/2022 1245MW-14 Aqueous 12/31/2022
015 12/30/2022 1145FD-1 Aqueous 12/31/2022
(15 samples)
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)

Page 6 of 104
Volatile Organic Compounds by GC/MS
Description:Matrix:
Date Received:
Client:Laboratory ID:
Date Sampled:
Buxton Environmental
Equipment Blank
XL31002-011
12/30/2022 1535
12/31/2022
Aqueous
Project Name: Gaston Co Unit II MSW
Project Number: 3606
Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch
1 5030B 8260D 1 01/06/2023 0136 JMM2 64266
AnalyticalCAS
Parameter Number Method Result Q LOQ Units Run DL
Acetone 67-64-1 8260D ND L 1ug/L5.020
Acrylonitrile 107-13-1 8260D ND 1ug/L0.8020
Benzene 71-43-2 8260D ND 1ug/L0.401.0
Bromochloromethane 74-97-5 8260D ND 1ug/L0.401.0
Bromodichloromethane 75-27-4 8260D ND 1ug/L0.401.0
Bromoform 75-25-2 8260D ND 1ug/L0.401.0
Bromomethane (Methyl bromide)74-83-9 8260D ND 1ug/L0.402.0
2-Butanone (MEK)78-93-3 8260D ND L 1ug/L2.010
Carbon disulfide 75-15-0 8260D ND 1ug/L0.401.0
Carbon tetrachloride 56-23-5 8260D ND 1ug/L0.401.0
Chlorobenzene 108-90-7 8260D ND 1ug/L0.401.0
Chloroethane 75-00-3 8260D ND 1ug/L0.402.0
Chloroform 67-66-3 8260D ND 1ug/L0.401.0
Chloromethane (Methyl chloride)74-87-3 8260D ND 1ug/L0.501.0
1,2-Dibromo-3-chloropropane (DBCP)96-12-8 8260D ND 1ug/L0.401.0
Dibromochloromethane 124-48-1 8260D ND 1ug/L0.401.0
1,2-Dibromoethane (EDB)106-93-4 8260D ND 1ug/L0.401.0
Dibromomethane (Methylene bromide)74-95-3 8260D ND 1ug/L0.401.0
trans-1,4-Dichloro-2-butene 110-57-6 8260D ND 1ug/L0.502.0
1,2-Dichlorobenzene 95-50-1 8260D ND 1ug/L0.401.0
1,4-Dichlorobenzene 106-46-7 8260D ND 1ug/L0.401.0
1,1-Dichloroethane 75-34-3 8260D ND 1ug/L0.401.0
1,2-Dichloroethane 107-06-2 8260D ND 1ug/L0.401.0
1,1-Dichloroethene 75-35-4 8260D ND 1ug/L0.401.0
cis-1,2-Dichloroethene 156-59-2 8260D ND 1ug/L0.401.0
trans-1,2-Dichloroethene 156-60-5 8260D ND 1ug/L0.401.0
1,2-Dichloropropane 78-87-5 8260D ND 1ug/L0.401.0
cis-1,3-Dichloropropene 10061-01-5 8260D ND 1ug/L0.401.0
trans-1,3-Dichloropropene 10061-02-6 8260D ND 1ug/L0.401.0
1,4-Dioxane 123-91-1 8260D ND L 1ug/L1350
Ethylbenzene 100-41-4 8260D ND 1ug/L0.401.0
2-Hexanone 591-78-6 8260D ND L 1ug/L2.010
Methyl iodide (Iodomethane)74-88-4 8260D ND 1ug/L0.405.0
4-Methyl-2-pentanone 108-10-1 8260D ND 1ug/L2.010
Methylene chloride 75-09-2 8260D 2.1 1ug/L0.401.0
Styrene 100-42-5 8260D ND 1ug/L0.411.0
1,1,1,2-Tetrachloroethane 630-20-6 8260D ND 1ug/L0.401.0
1,1,2,2-Tetrachloroethane 79-34-5 8260D ND 1ug/L0.401.0
Tetrachloroethene 127-18-4 8260D ND 1ug/L0.401.0
Toluene 108-88-3 8260D ND 1ug/L0.401.0
1,1,1-Trichloroethane 71-55-6 8260D ND 1ug/L0.401.0
1,1,2-Trichloroethane 79-00-5 8260D ND 1ug/L0.401.0
Trichloroethene 79-01-6 8260D ND 1ug/L0.401.0
Trichlorofluoromethane 75-69-4 8260D ND 1ug/L0.401.0
J = Estimated result < LOQ and > DL_
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range
P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria
H = Out of holding time
Q = Surrogate failure
L = LCS/LCSD failure
S = MS/MSD failure
DL = Detection Limit
W = Reported on wet weight basis
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)

Page 47 of 104
Volatile Organic Compounds by GC/MS
Description:Matrix:
Date Received:
Client:Laboratory ID:
Date Sampled:
Buxton Environmental
Equipment Blank
XL31002-011
12/30/2022 1535
12/31/2022
Aqueous
Project Name: Gaston Co Unit II MSW
Project Number: 3606
Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch
1 5030B 8260D 1 01/06/2023 0136 JMM2 64266
AnalyticalCAS
Parameter Number Method Result Q LOQ Units Run DL
1,2,3-Trichloropropane 96-18-4 8260D ND 1ug/L0.401.0
Vinyl acetate 108-05-4 8260D ND 1ug/L1.25.0
Vinyl chloride 75-01-4 8260D ND 1ug/L0.401.0
Xylenes (total)1330-20-7 8260D ND 1ug/L0.401.0
AcceptanceRun 1
Surrogate Q % Recovery Limits
Bromofluorobenzene 109 70-130
1,2-Dichloroethane-d4 109 70-130
Toluene-d8 113 70-130
J = Estimated result < LOQ and > DL_
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range
P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria
H = Out of holding time
Q = Surrogate failure
L = LCS/LCSD failure
S = MS/MSD failure
DL = Detection Limit
W = Reported on wet weight basis
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)

Page 48 of 104
Volatile Organic Compounds by GC/MS
Description:Matrix:
Date Received:
Client:Laboratory ID:
Date Sampled:
Buxton Environmental
MW-12
XL31002-012
12/29/2022 1215
12/31/2022
Aqueous
Project Name: Gaston Co Unit II MSW
Project Number: 3606
Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch
1 5030B 8260D 1 01/06/2023 0634 JMM2 64266
AnalyticalCAS
Parameter Number Method Result Q LOQ Units Run DL
Acetone 67-64-1 8260D ND L 1ug/L5.020
Acrylonitrile 107-13-1 8260D ND 1ug/L0.8020
Benzene 71-43-2 8260D ND 1ug/L0.401.0
Bromochloromethane 74-97-5 8260D ND 1ug/L0.401.0
Bromodichloromethane 75-27-4 8260D ND 1ug/L0.401.0
Bromoform 75-25-2 8260D ND 1ug/L0.401.0
Bromomethane (Methyl bromide)74-83-9 8260D ND 1ug/L0.402.0
2-Butanone (MEK)78-93-3 8260D ND L 1ug/L2.010
Carbon disulfide 75-15-0 8260D ND 1ug/L0.401.0
Carbon tetrachloride 56-23-5 8260D ND 1ug/L0.401.0
Chlorobenzene 108-90-7 8260D ND 1ug/L0.401.0
Chloroethane 75-00-3 8260D ND 1ug/L0.402.0
Chloroform 67-66-3 8260D ND 1ug/L0.401.0
Chloromethane (Methyl chloride)74-87-3 8260D ND 1ug/L0.501.0
1,2-Dibromo-3-chloropropane (DBCP)96-12-8 8260D ND 1ug/L0.401.0
Dibromochloromethane 124-48-1 8260D ND 1ug/L0.401.0
1,2-Dibromoethane (EDB)106-93-4 8260D ND 1ug/L0.401.0
Dibromomethane (Methylene bromide)74-95-3 8260D ND 1ug/L0.401.0
trans-1,4-Dichloro-2-butene 110-57-6 8260D ND 1ug/L0.502.0
1,2-Dichlorobenzene 95-50-1 8260D ND 1ug/L0.401.0
1,4-Dichlorobenzene 106-46-7 8260D ND 1ug/L0.401.0
1,1-Dichloroethane 75-34-3 8260D ND 1ug/L0.401.0
1,2-Dichloroethane 107-06-2 8260D ND 1ug/L0.401.0
1,1-Dichloroethene 75-35-4 8260D ND 1ug/L0.401.0
cis-1,2-Dichloroethene 156-59-2 8260D ND 1ug/L0.401.0
trans-1,2-Dichloroethene 156-60-5 8260D ND 1ug/L0.401.0
1,2-Dichloropropane 78-87-5 8260D ND 1ug/L0.401.0
cis-1,3-Dichloropropene 10061-01-5 8260D ND 1ug/L0.401.0
trans-1,3-Dichloropropene 10061-02-6 8260D ND 1ug/L0.401.0
1,4-Dioxane 123-91-1 8260D ND L 1ug/L1350
Ethylbenzene 100-41-4 8260D ND 1ug/L0.401.0
2-Hexanone 591-78-6 8260D ND L 1ug/L2.010
Methyl iodide (Iodomethane)74-88-4 8260D ND 1ug/L0.405.0
4-Methyl-2-pentanone 108-10-1 8260D ND 1ug/L2.010
Methylene chloride 75-09-2 8260D ND 1ug/L0.401.0
Styrene 100-42-5 8260D ND 1ug/L0.411.0
1,1,1,2-Tetrachloroethane 630-20-6 8260D ND 1ug/L0.401.0
1,1,2,2-Tetrachloroethane 79-34-5 8260D ND 1ug/L0.401.0
Tetrachloroethene 127-18-4 8260D ND 1ug/L0.401.0
Tetrahydrofuran 109-99-9 8260D ND 1ug/L1.05.0
Toluene 108-88-3 8260D ND 1ug/L0.401.0
1,1,1-Trichloroethane 71-55-6 8260D ND 1ug/L0.401.0
1,1,2-Trichloroethane 79-00-5 8260D ND 1ug/L0.401.0
Trichloroethene 79-01-6 8260D ND 1ug/L0.401.0
J = Estimated result < LOQ and > DL_
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range
P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria
H = Out of holding time
Q = Surrogate failure
L = LCS/LCSD failure
S = MS/MSD failure
DL = Detection Limit
W = Reported on wet weight basis
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)

Page 49 of 104
Volatile Organic Compounds by GC/MS
Description:Matrix:
Date Received:
Client:Laboratory ID:
Date Sampled:
Buxton Environmental
MW-12
XL31002-012
12/29/2022 1215
12/31/2022
Aqueous
Project Name: Gaston Co Unit II MSW
Project Number: 3606
Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch
1 5030B 8260D 1 01/06/2023 0634 JMM2 64266
AnalyticalCAS
Parameter Number Method Result Q LOQ Units Run DL
Trichlorofluoromethane 75-69-4 8260D ND 1ug/L0.401.0
1,2,3-Trichloropropane 96-18-4 8260D ND 1ug/L0.401.0
Vinyl acetate 108-05-4 8260D ND 1ug/L1.25.0
Vinyl chloride 75-01-4 8260D ND 1ug/L0.401.0
Xylenes (total)1330-20-7 8260D ND 1ug/L0.401.0
AcceptanceRun 1
Surrogate Q % Recovery Limits
Bromofluorobenzene 104 70-130
1,2-Dichloroethane-d4 108 70-130
Toluene-d8 110 70-130
J = Estimated result < LOQ and > DL_
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range
P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria
H = Out of holding time
Q = Surrogate failure
L = LCS/LCSD failure
S = MS/MSD failure
DL = Detection Limit
W = Reported on wet weight basis
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)

Page 50 of 104
ICP-MS
Description:Matrix:
Date Received:
Client:Laboratory ID:
Date Sampled:
Buxton Environmental
MW-12
XL31002-012
12/29/2022 1215
12/31/2022
Aqueous
Project Name: Gaston Co Unit II MSW
Project Number: 3606
Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch
1 3005A 6020B 1 01/05/2023 0500 BNW 01/03/2023 1530 63980
AnalyticalCAS
Parameter Number Method Result Q LOQ Units Run DL
Arsenic 7440-38-2 6020B ND 1ug/L1.32.0
Barium 7440-39-3 6020B 70 1ug/L1.35.0
Cadmium 7440-43-9 6020B ND 1ug/L0.130.50
Chromium 7440-47-3 6020B ND 1ug/L1.35.0
Lead 7439-92-1 6020B ND 1ug/L0.251.0
Selenium 7782-49-2 6020B ND 1ug/L1.35.0
Silver 7440-22-4 6020B ND 1ug/L0.251.0
J = Estimated result < LOQ and > DL_
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range
P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria
H = Out of holding time
Q = Surrogate failure
L = LCS/LCSD failure
S = MS/MSD failure
DL = Detection Limit
W = Reported on wet weight basis
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)

Page 51 of 104
Volatile Organic Compounds by GC/MS
Description:Matrix:
Date Received:
Client:Laboratory ID:
Date Sampled:
Buxton Environmental
MW-13
XL31002-013
12/29/2022 1330
12/31/2022
Aqueous
Project Name: Gaston Co Unit II MSW
Project Number: 3606
Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch
1 5030B 8260D 1 01/06/2023 0658 JMM2 64266
AnalyticalCAS
Parameter Number Method Result Q LOQ Units Run DL
Acetone 67-64-1 8260D 5.0 JL 1ug/L5.020
Acrylonitrile 107-13-1 8260D ND 1ug/L0.8020
Benzene 71-43-2 8260D ND 1ug/L0.401.0
Bromochloromethane 74-97-5 8260D ND 1ug/L0.401.0
Bromodichloromethane 75-27-4 8260D ND 1ug/L0.401.0
Bromoform 75-25-2 8260D ND 1ug/L0.401.0
Bromomethane (Methyl bromide)74-83-9 8260D ND 1ug/L0.402.0
2-Butanone (MEK)78-93-3 8260D ND L 1ug/L2.010
Carbon disulfide 75-15-0 8260D ND 1ug/L0.401.0
Carbon tetrachloride 56-23-5 8260D ND 1ug/L0.401.0
Chlorobenzene 108-90-7 8260D ND 1ug/L0.401.0
Chloroethane 75-00-3 8260D ND 1ug/L0.402.0
Chloroform 67-66-3 8260D ND 1ug/L0.401.0
Chloromethane (Methyl chloride)74-87-3 8260D ND 1ug/L0.501.0
1,2-Dibromo-3-chloropropane (DBCP)96-12-8 8260D ND 1ug/L0.401.0
Dibromochloromethane 124-48-1 8260D ND 1ug/L0.401.0
1,2-Dibromoethane (EDB)106-93-4 8260D ND 1ug/L0.401.0
Dibromomethane (Methylene bromide)74-95-3 8260D ND 1ug/L0.401.0
trans-1,4-Dichloro-2-butene 110-57-6 8260D ND 1ug/L0.502.0
1,2-Dichlorobenzene 95-50-1 8260D ND 1ug/L0.401.0
1,4-Dichlorobenzene 106-46-7 8260D ND 1ug/L0.401.0
1,1-Dichloroethane 75-34-3 8260D ND 1ug/L0.401.0
1,2-Dichloroethane 107-06-2 8260D ND 1ug/L0.401.0
1,1-Dichloroethene 75-35-4 8260D ND 1ug/L0.401.0
cis-1,2-Dichloroethene 156-59-2 8260D ND 1ug/L0.401.0
trans-1,2-Dichloroethene 156-60-5 8260D ND 1ug/L0.401.0
1,2-Dichloropropane 78-87-5 8260D ND 1ug/L0.401.0
cis-1,3-Dichloropropene 10061-01-5 8260D ND 1ug/L0.401.0
trans-1,3-Dichloropropene 10061-02-6 8260D ND 1ug/L0.401.0
1,4-Dioxane 123-91-1 8260D ND L 1ug/L1350
Ethylbenzene 100-41-4 8260D ND 1ug/L0.401.0
2-Hexanone 591-78-6 8260D ND L 1ug/L2.010
Methyl iodide (Iodomethane)74-88-4 8260D ND 1ug/L0.405.0
4-Methyl-2-pentanone 108-10-1 8260D ND 1ug/L2.010
Methylene chloride 75-09-2 8260D ND 1ug/L0.401.0
Styrene 100-42-5 8260D ND 1ug/L0.411.0
1,1,1,2-Tetrachloroethane 630-20-6 8260D ND 1ug/L0.401.0
1,1,2,2-Tetrachloroethane 79-34-5 8260D ND 1ug/L0.401.0
Tetrachloroethene 127-18-4 8260D ND 1ug/L0.401.0
Tetrahydrofuran 109-99-9 8260D ND 1ug/L1.05.0
Toluene 108-88-3 8260D ND 1ug/L0.401.0
1,1,1-Trichloroethane 71-55-6 8260D ND 1ug/L0.401.0
1,1,2-Trichloroethane 79-00-5 8260D ND 1ug/L0.401.0
Trichloroethene 79-01-6 8260D ND 1ug/L0.401.0
J = Estimated result < LOQ and > DL_
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range
P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria
H = Out of holding time
Q = Surrogate failure
L = LCS/LCSD failure
S = MS/MSD failure
DL = Detection Limit
W = Reported on wet weight basis
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)

Page 52 of 104
Volatile Organic Compounds by GC/MS
Description:Matrix:
Date Received:
Client:Laboratory ID:
Date Sampled:
Buxton Environmental
MW-13
XL31002-013
12/29/2022 1330
12/31/2022
Aqueous
Project Name: Gaston Co Unit II MSW
Project Number: 3606
Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch
1 5030B 8260D 1 01/06/2023 0658 JMM2 64266
AnalyticalCAS
Parameter Number Method Result Q LOQ Units Run DL
Trichlorofluoromethane 75-69-4 8260D ND 1ug/L0.401.0
1,2,3-Trichloropropane 96-18-4 8260D ND 1ug/L0.401.0
Vinyl acetate 108-05-4 8260D ND 1ug/L1.25.0
Vinyl chloride 75-01-4 8260D ND 1ug/L0.401.0
Xylenes (total)1330-20-7 8260D ND 1ug/L0.401.0
AcceptanceRun 1
Surrogate Q % Recovery Limits
Bromofluorobenzene 108 70-130
1,2-Dichloroethane-d4 108 70-130
Toluene-d8 111 70-130
J = Estimated result < LOQ and > DL_
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range
P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria
H = Out of holding time
Q = Surrogate failure
L = LCS/LCSD failure
S = MS/MSD failure
DL = Detection Limit
W = Reported on wet weight basis
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)

Page 53 of 104
ICP-MS
Description:Matrix:
Date Received:
Client:Laboratory ID:
Date Sampled:
Buxton Environmental
MW-13
XL31002-013
12/29/2022 1330
12/31/2022
Aqueous
Project Name: Gaston Co Unit II MSW
Project Number: 3606
Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch
1 3005A 6020B 1 01/05/2023 0511 BNW 01/03/2023 1530 63980
AnalyticalCAS
Parameter Number Method Result Q LOQ Units Run DL
Arsenic 7440-38-2 6020B ND 1ug/L1.32.0
Barium 7440-39-3 6020B 64 1ug/L1.35.0
Cadmium 7440-43-9 6020B 0.19 J 1ug/L0.130.50
Chromium 7440-47-3 6020B 3.9 J 1ug/L1.35.0
Lead 7439-92-1 6020B 3.5 1ug/L0.251.0
Selenium 7782-49-2 6020B 1.4 J 1ug/L1.35.0
Silver 7440-22-4 6020B ND 1ug/L0.251.0
J = Estimated result < LOQ and > DL_
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range
P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria
H = Out of holding time
Q = Surrogate failure
L = LCS/LCSD failure
S = MS/MSD failure
DL = Detection Limit
W = Reported on wet weight basis
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)

Page 54 of 104
Volatile Organic Compounds by GC/MS
Description:Matrix:
Date Received:
Client:Laboratory ID:
Date Sampled:
Buxton Environmental
MW-14
XL31002-014
12/29/2022 1245
12/31/2022
Aqueous
Project Name: Gaston Co Unit II MSW
Project Number: 3606
Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch
1 5030B 8260D 1 01/06/2023 0723 JMM2 64266
AnalyticalCAS
Parameter Number Method Result Q LOQ Units Run DL
Acetone 67-64-1 8260D ND L 1ug/L5.020
Acrylonitrile 107-13-1 8260D ND 1ug/L0.8020
Benzene 71-43-2 8260D ND 1ug/L0.401.0
Bromochloromethane 74-97-5 8260D ND 1ug/L0.401.0
Bromodichloromethane 75-27-4 8260D ND 1ug/L0.401.0
Bromoform 75-25-2 8260D ND 1ug/L0.401.0
Bromomethane (Methyl bromide)74-83-9 8260D ND 1ug/L0.402.0
2-Butanone (MEK)78-93-3 8260D ND L 1ug/L2.010
Carbon disulfide 75-15-0 8260D ND 1ug/L0.401.0
Carbon tetrachloride 56-23-5 8260D ND 1ug/L0.401.0
Chlorobenzene 108-90-7 8260D ND 1ug/L0.401.0
Chloroethane 75-00-3 8260D ND 1ug/L0.402.0
Chloroform 67-66-3 8260D ND 1ug/L0.401.0
Chloromethane (Methyl chloride)74-87-3 8260D ND 1ug/L0.501.0
1,2-Dibromo-3-chloropropane (DBCP)96-12-8 8260D ND 1ug/L0.401.0
Dibromochloromethane 124-48-1 8260D ND 1ug/L0.401.0
1,2-Dibromoethane (EDB)106-93-4 8260D ND 1ug/L0.401.0
Dibromomethane (Methylene bromide)74-95-3 8260D ND 1ug/L0.401.0
trans-1,4-Dichloro-2-butene 110-57-6 8260D ND 1ug/L0.502.0
1,2-Dichlorobenzene 95-50-1 8260D ND 1ug/L0.401.0
1,4-Dichlorobenzene 106-46-7 8260D ND 1ug/L0.401.0
1,1-Dichloroethane 75-34-3 8260D ND 1ug/L0.401.0
1,2-Dichloroethane 107-06-2 8260D ND 1ug/L0.401.0
1,1-Dichloroethene 75-35-4 8260D ND 1ug/L0.401.0
cis-1,2-Dichloroethene 156-59-2 8260D ND 1ug/L0.401.0
trans-1,2-Dichloroethene 156-60-5 8260D ND 1ug/L0.401.0
1,2-Dichloropropane 78-87-5 8260D ND 1ug/L0.401.0
cis-1,3-Dichloropropene 10061-01-5 8260D ND 1ug/L0.401.0
trans-1,3-Dichloropropene 10061-02-6 8260D ND 1ug/L0.401.0
1,4-Dioxane 123-91-1 8260D ND L 1ug/L1350
Ethylbenzene 100-41-4 8260D ND 1ug/L0.401.0
2-Hexanone 591-78-6 8260D ND L 1ug/L2.010
Methyl iodide (Iodomethane)74-88-4 8260D ND 1ug/L0.405.0
4-Methyl-2-pentanone 108-10-1 8260D ND 1ug/L2.010
Methylene chloride 75-09-2 8260D ND 1ug/L0.401.0
Styrene 100-42-5 8260D ND 1ug/L0.411.0
1,1,1,2-Tetrachloroethane 630-20-6 8260D ND 1ug/L0.401.0
1,1,2,2-Tetrachloroethane 79-34-5 8260D ND 1ug/L0.401.0
Tetrachloroethene 127-18-4 8260D ND 1ug/L0.401.0
Tetrahydrofuran 109-99-9 8260D ND 1ug/L1.05.0
Toluene 108-88-3 8260D ND 1ug/L0.401.0
1,1,1-Trichloroethane 71-55-6 8260D ND 1ug/L0.401.0
1,1,2-Trichloroethane 79-00-5 8260D ND 1ug/L0.401.0
Trichloroethene 79-01-6 8260D ND 1ug/L0.401.0
J = Estimated result < LOQ and > DL_
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range
P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria
H = Out of holding time
Q = Surrogate failure
L = LCS/LCSD failure
S = MS/MSD failure
DL = Detection Limit
W = Reported on wet weight basis
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)

Page 55 of 104
Volatile Organic Compounds by GC/MS
Description:Matrix:
Date Received:
Client:Laboratory ID:
Date Sampled:
Buxton Environmental
MW-14
XL31002-014
12/29/2022 1245
12/31/2022
Aqueous
Project Name: Gaston Co Unit II MSW
Project Number: 3606
Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch
1 5030B 8260D 1 01/06/2023 0723 JMM2 64266
AnalyticalCAS
Parameter Number Method Result Q LOQ Units Run DL
Trichlorofluoromethane 75-69-4 8260D ND 1ug/L0.401.0
1,2,3-Trichloropropane 96-18-4 8260D ND 1ug/L0.401.0
Vinyl acetate 108-05-4 8260D ND 1ug/L1.25.0
Vinyl chloride 75-01-4 8260D ND 1ug/L0.401.0
Xylenes (total)1330-20-7 8260D ND 1ug/L0.401.0
AcceptanceRun 1
Surrogate Q % Recovery Limits
Bromofluorobenzene 106 70-130
1,2-Dichloroethane-d4 112 70-130
Toluene-d8 111 70-130
J = Estimated result < LOQ and > DL_
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range
P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria
H = Out of holding time
Q = Surrogate failure
L = LCS/LCSD failure
S = MS/MSD failure
DL = Detection Limit
W = Reported on wet weight basis
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)

Page 56 of 104
ICP-MS
Description:Matrix:
Date Received:
Client:Laboratory ID:
Date Sampled:
Buxton Environmental
MW-14
XL31002-014
12/29/2022 1245
12/31/2022
Aqueous
Project Name: Gaston Co Unit II MSW
Project Number: 3606
Run Prep Method Analytical Method Dilution Analysis Date Analyst Prep Date Batch
1 3005A 6020B 1 01/05/2023 0521 BNW 01/03/2023 1530 63980
AnalyticalCAS
Parameter Number Method Result Q LOQ Units Run DL
Arsenic 7440-38-2 6020B ND 1ug/L1.32.0
Barium 7440-39-3 6020B 150 1ug/L1.35.0
Cadmium 7440-43-9 6020B ND 1ug/L0.130.50
Chromium 7440-47-3 6020B ND 1ug/L1.35.0
Lead 7439-92-1 6020B ND 1ug/L0.251.0
Selenium 7782-49-2 6020B ND 1ug/L1.35.0
Silver 7440-22-4 6020B ND 1ug/L0.251.0
J = Estimated result < LOQ and > DL_
LOQ = Limit of Quantitation B = Detected in the method blank E = Quantitation of compound exceeded the calibration range
P = The RPD between two GC columns exceeds 40%ND = Not detected at or above the DL N = Recovery is out of criteria
H = Out of holding time
Q = Surrogate failure
L = LCS/LCSD failure
S = MS/MSD failure
DL = Detection Limit
W = Reported on wet weight basis
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)

Page 57 of 104
Chain of Custody
and
Miscellaneous Documents
106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)

Page 101 of 104
PACE ANALYTICAL SERVICES, LLC

106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)

Page 102 of 104
PACE ANALYTICAL SERVICES, LLC

106 Vantage Point Drive West Columbia, SC 29172 [phone] Fax [phone] www.pacelabs.com
Pace Analytical Services, LLC (formerly Shealy Environmental Services, Inc.)

Page 103 of 104