WS_4900_16457_MRP_20221019_Stephens Exxon

GROUNDWATER MONITORING REPORT
Stephen’s Exxon (Incident #16457)
20655 Highway 88 West
Creston, Ashe County, North Carolina
October 19, 2022
Terracon Project No. 75207132

Prepared for:
North Carolina Department of Environmental Quality
Division of Waste Management
Raleigh, North Carolina

Prepared by:
Terracon Consultants, Inc.
Greensboro, North Carolina

Terracon Consultants, Inc. 7327-G West friendly Avenue Greensboro, NC 27410
P 336-3365-8135 F 336-365-7020 terracon.com
October 19, 2022

Mr. Herb Berger, L.G.
North Carolina Department of Environmental Quality
Division of Waste Management
1646 Mail Service Center
Raleigh, North Carolina 27699-1646
Email: [e-mail]

Re: Subsequent Groundwater Monitoring Report
Stephen’s Exxon
20655 Highway 88 West
Creston, Ashe County, North Carolina
UST Incident Number: 16457
Terracon Project No. 75207132

Dear Mr. Berger:

Terracon Consultants, Inc. (Terracon) is pleased to submit this Groundwater Monitoring Report for
the above referenced property. This report has been prepared in general accordance with North
Carolina Department of Environmental Quality (NCDEQ), UST Section Guidelines for Assessment
and Corrective Action for UST Releases, dated January 19, 2021, and Task Authorization No. 03,
approved on August 10, 2022.

If you have any questions regarding this report or the assessment activities, please contact us at
336-365-8135.

Sincerely,
Terracon Consultants, Inc.

F. Christopher Driscoll, P.G. M. Neal McElveen, P.E.
Project Geologist Principal/Senior Consultant

Enclosures

Table of Contents
A. SITE INFORMATION ............................................................................................... 1
B. EXECUTIVE SUMMARY .......................................................................................... 2
C. SITE HISTORY AND CHARACTERIZATION .......................................................... 4
C.1 Site Setting .......................................................................................................................................... 4
C.2 Release Summary .............................................................................................................................. 4
C.3 Previous Investigations ....................................................................................................................... 5
C.4 Water Supply Wells ............................................................................................................................. 7
C.5 Surface Water ..................................................................................................................................... 8
C.6 Land Use Information ......................................................................................................................... 8
D. ASSESSMENT INFORMATION ........................................................................... 8
D.1 Site Geology and Hydrogeology ........................................................................................................ 8
D.2 Sampling Activities .............................................................................................................................. 9
D.3 LNAPL Evaluation ............................................................................................................................. 10
D.4 Analytical Results .............................................................................................................................. 10
E. AQUIFER TESTING ............................................................................................ 11
F. GROUNDWATER MODELING ........................................................................... 12
G. CONCLUSIONS AND RECOMMENDATIONS ................................................... 17

EXHIBITS
Exhibit 1: Topographic Map
Exhibit 2: Site Diagram
Exhibit 3: Water Supply Well Map
Exhibit 4: Groundwater Elevation Contour Map (May 2022)
Exhibit 5: Groundwater Analytical Results (May 2022)
Exhibit 6: Mann Kendall Analysis – Benzene
Exhibit 7: Mann Kendall Analysis – Toluene
Exhibit 8: Mann Kendall Analysis – Ethylbenzene
Exhibit 9: Mann Kendall Analysis – Xylenes (Total)
Exhibit 10: Mann Kendall Analysis – Naphthalene
Exhibit 11: Mann Kendall Analysis – 1,2,4-Trimethylbenzene

TABLES
Table 1: Water Supply Well and Spring Information
Table 2: Historical Water Supply Wells Analytical Results
Table 3: Monitoring Well Construction Information and Water Level Measurements
Table 4: Summary of Groundwater Analytical Results

APPENDIX
Appendix A: Field Notes
Appendix B: Laboratory Analytical Results and Chain of Custody Form
Appendix C: AQTESOLV Results
Appendix D: RBCA Toolkit Model Results
Stephen’s Exxon
Creston, North Carolina
Terracon Project No. 75207132
Incident No. 16457
October 19, 2022

Responsive ■ Resourceful ■ Reliable 1

GROUNDWATER MONITORING REPORT
A. SITE INFORMATION
Date of Report: October 19, 2022
NCDEQ Incident No: 16457
Facility ID: 0-000453
UST #: WS-4900
Site Name: Stephens Exxon
Site Location: 20655 Highway 88 West
Creston, Ashe County, North Carolina 28615
Latitude: N 36.401515
Longitude: W -81.693370
UST Owner/Operator: Segraves Oil Company, Inc.

Current Property Owner: Vincent Boccardy and Courtney Cutillo
420 Barlow Rd
Creston, North Carolina 28615

Current Property Occupant:Vincent Boccardy and Courtney Cutillo
420 Barlow Rd
Creston, North Carolina 28615

Consultant: Terracon Consultants, Inc. (Contact: F. Christopher Driscoll)
7327-G W. Friendly Ave
Greensboro, North Carolina 27410
[phone]
Laboratory: Pace Analytical National Center for Testing and Innovation
12065 Lebanon Road
Mount Juliet, Tennessee 37122
[phone]
Release Information: Release Date: October 1996
Estimated Quantity: Unknown
Source: three 2,000-gallon gasoline USTs, one 560-gallon Kerosene
UST
Cause of Release: Leaking product lines
Currently Active Tanks: None
Stephen’s Exxon
Creston, North Carolina
Terracon Project No. 75207132
Incident No. 16457
October 19, 2022

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I, F. Christopher Driscoll, a Licensed Geologist for Terracon Consultants, Inc., do certify that the
information contained in this report is correct and accurate to the best of my knowledge.

F. Christopher Driscoll, P.G.
NC License No. 2695

Terracon Consultants, Inc. is licensed to practice geology/engineering in North Carolina. The
certification number of the corporation is F-0869.
B. EXECUTIVE SUMMARY
The purpose of this report is to evaluate the current status of the groundwater quality at the former
Stephen’s Exxon site (Incident No. 16457) by sampling monitoring wells MW-11, MW-13, and MW-
14 subsequent to a mobile multi-phase extraction (MMPE) event. Terracon completed this report to
summarize the findings of groundwater sampling activities performed on May 10, 2022. The release
incident is situated on the property located at 20655 Highway 88 West in Creston, Ashe County,
North Carolina in an area developed with rural residences. The site currently operates as a
workshop for the current property owner. According to previous investigations completed at the site,
there appears to be two separate plumes at the site: a gasoline plume located on the northeastern
section of the site in the vicinity of MW-5R and a kerosene plume located west of the on-site
building near MW-11.

On April 19, 2022, Terracon and a North Carolina registered well driller, Environmental Drilling &
Probing Services (EDPS), mobilized to the site to install one recovery well (RW-1) and one air
sparge well (AS-1) in the vicinity of the kerosene plume on the west side of the on-site building. Well
top-of-casing (TOC) relative elevations for newly installed wells AS-1 and RW-1 were surveyed
using a Topcon self-leveling laser level using MW-11 as a benchmark.
Terracon personnel mobilized to the site on May 2, 2022, to oversee the initiation of a 96-hour
MMPE and air sparge event at wells AS-1 and RW-1 by Terracon’s subcontractor Advanced
Environmental Services (AES). Subsequent to the MMPE event, Terracon mobilized to the site on
May 10, 2022, to sample monitoring wells MW-11, MW-13, and MW-14.
Based on information obtained during the completion of our assessment activities, groundwater is
estimated to flow towards the southeast. Two newly installed wells RW-1 (a recovery well) and AS-1
(an air sparge well), were installed in the vicinity of the former kerosene UST near MW-11. Light
Non-Aqueous Phase Liquids (LNAPL) was observed in the monitoring well MW-11 (0.13 feet) prior
Stephen’s Exxon
Creston, North Carolina
Terracon Project No. 75207132
Incident No. 16457
October 19, 2022

Responsive ■ Resourceful ■ Reliable 3
to the MMPE event then not present subsequent to the MMPE event. Following the 96-hour MMPE
and air sparge event conducted at wells AS-1 and RW-1, 2,670 gallons of a product/water mixture
were removed from the site. Approximately 6 gallons of free product was recovered as liquid. Mass
balance calculations indicated total VOC emissions removed from the wells as vapor equated to
7.67 gallons.
Wells MW-11 and MW-13 reported concentrations of contaminants above the laboratory method
detection limits (MDLs) but below the 2L Standards for volatile organic compounds. However, field
observations indicated a strong petroleum odor emanating from the groundwater purged from
monitoring well MW-11. Petroleum constituents were not reported at concentrations exceeding the
MDLs in MW-14. Volatile organic compounds (VOCs) have significantly decreased in concentration
in monitoring wells MW-11, MW-13, and MW-14 since the September 2021 sampling event.
Based on information obtained during the completion of our assessment activities, Terracon
provides the following conclusions and findings.

◼ Groundwater flow is estimated to be towards the southeast.
◼ There are four private water supply wells and five water supply springs within a
1,500-foot radius of the site. One of the private water supply wells is on-site and
down-gradient of the source releases. Municipal water is not available to the site or
the immediately surrounding properties.
◼ In the vicinity of the kerosene plume, the groundwater samples from MW-11 and
MW-13 analyzed by Standard Method 6200B and EPA Method 625 from did not
report contaminants at concentrations exceeding the 2L Standards but did report
constituents above MDLs. Petroleum constituents were not reported at
concentrations exceeding the MDLs in well MW-4.
◼ Both MADEP C9-C18 Aliphatics and C9-C22 Aromatics fraction classes in the
sample collected from well MW-11 in the vicinity of the kerosene plume exceeded
the established 2L Standards.
◼ In the vicinity of the gasoline plume, the groundwater sample collected from well
MW-5R and MW-17 contained constituents exceeding the 2L Standards with other
constituents above the MDLs. Petroleum constituents were not reported at
concentrations exceeding the 2L Standards in well MW-15, however some analytes
were detected above the MDLs.
◼ The dispersion only model appears to simulate contaminant transport and
degradation between the source areas to downgradient wells accurately.
◼ Based on the dispersion only model, contaminant concentrations are not predicted
to exceed the 2L Standards when steady state conditions are achieved. However,
each receptor has the potential to be impacted by contaminants at levels below the
2L Standards.
Stephen’s Exxon
Creston, North Carolina
Terracon Project No. 75207132
Incident No. 16457
October 19, 2022

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◼ Based on the historical presence of measurable LNAPL in MW-11, LNAPL product
may still be present within the soil pores in the vicinity of the kerosene release and
may continue to reappear in the well until soil is excavated.

Based on the data presented in this monitoring report, Terracon recommends the following activities
be completed at the site:

Considering water supply well WSW-8 is approximately 60 feet down-gradient of the kerosene
plume at the site, Terracon recommends considering seeking a water supply well abandonment
agreement for WSW-8 for closure of the well in accordance with 15A NCAC 2C rules if
permission is given by the property owner. An alternative water supply source for the property
may need to be established with the property owner prior to abandonment.
Consider collecting soil samples in the vicinity of the former kerosene UST to assess if additional
soil excavation is necessary.
Continue to monitor the wells in the vicinity of the kerosene plume for levels of free product and
sample the on-site and surrounding water supply wells on a semi-annual basis.
C. SITE HISTORY AND CHARACTERIZATION
The purpose of this report is to evaluate the current status of the groundwater quality at the former
Stephens Exxon site. Terracon completed this report to summarize the findings of assessment
activities performed on May 10, 2022 at the former Stephen’s Exxon located at 20655 Highway 88
West in Creston, Ashe County, North Carolina (Exhibit 1). This Groundwater Monitoring Report
was prepared for the site in response to a request by the Incident Manager, Mr. Herb Berger with
the NCDEQ Division of Waste Management, Trust Fund Branch.

The Federal/State Lead Monitoring Report was prepared in general accordance with 15A NCAC 2L
.0115 regulations and the NCDEQ Underground Storage Tank (UST) Section Assessment
Guidelines, dated January 19, 2021, under the supervision of Mr. F. Christopher Driscoll, a North
Carolina licensed geologist (North Carolina License No. 2695).

C.1 Site Setting

The Stephen’s Exxon site is located at 20655 Highway 88 West in Creston, Ashe County, North
Carolina. The site is bordered to the north by NC Highway 88 West with surrounding residential and
agricultural parcels in a rural setting. The property has been developed with a single one-story
structure that serves as a workshop for the current property owner with asphalt and concrete
parking areas. Historically, the site operated as Joe Stephen’s Grocery that maintained three 2,000
-gallon gasoline USTs and one 560-gallon Kerosene UST. The site is depicted in Exhibit 2.
Stephen’s Exxon
Creston, North Carolina
Terracon Project No. 75207132
Incident No. 16457
October 19, 2022

Responsive ■ Resourceful ■ Reliable 5

C.2 Release Summary

According to historical assessment information, three 2,000-gallon gasoline USTs were installed in
May 1975 and one 560-gallon Kerosene UST was installed in May 1976. The gasoline USTs were
located near the northeast corner of the building on the property and the kerosene UST was located
along the west side of the building. The gasoline USTs, most of the product lines, and
approximately 100 cubic yards of contaminated soil were removed from the property in October
1996. Upon removal of the USTs, representatives from the Winston-Salem Regional Office, Division
of Water Quality noted the soil at the excavation site to be discolored and odorous.

C.3 Previous Investigations

Upon removal of the three 2,000-gallon gasoline USTs in October 1996, soil samples were
collected from the excavation site and the former fuel dispenser location by representatives of the
Winston-Salem Regional Office, Division of Water Quality. Laboratory analysis of the soil samples
yielded petroleum contaminants exceeding the North Carolina State Action Level of 10 parts per
million. During the same month, Salem Environmental installed a monitoring well (MW-1) in the
proximity of the former gasoline USTs which yielded groundwater with a distinct petroleum odor.
Due to evidence of contamination, the North Carolina Department of Environment and Natural
Resources (NCDENR) requested further investigation to evaluate the extent of the release.

Between March and June 1997, Geonetics Corporation (Geonetics) installed five shallow monitoring
wells (MW-2 through MW-6) around the building on the property, two temporary wells (TW-2 and
TW-3) east of the building on the property, and a deep aquifer monitoring well (MW-7) south of the
former UST location to further delineate the extent of petroleum impact on the site. Laboratory
analysis from subsequent groundwater sampling in monitoring wells MW-1, MW-5, and TW-2
identified concentrations of petroleum constituents above Title 15A of the North Carolina
Administrative Code subchapter 2L (15A NCAC 2L) groundwater standards, hereafter referred to
as the 2L Standards. To further delineate petroleum contamination, Geonetics installed two
additional shallow monitoring wells (MW-8 and MW-9) further east on the property towards the
North Fork New River.

In August 1998, Geonetics facilitated the removal of the 560-gallon Kerosene UST on the site along
with approximately 7.3 cubic yards of contaminated soil. Laboratory analysis from collected soil
samples reported concentrations that exceeded the Soil-to-Water Maximum Soil Contaminant
Concentrations (MSCCs) with detections of volatile and semi-volatile total petroleum hydrocarbons
in excess of the North Carolina State Action Level of 10 parts per million. Geonetics concluded that
groundwater contamination was due to releases from the UST systems and submitted a Corrective
Action Plan (CAP) that proposed further remedial excavations. To further delineate petroleum
contamination, Geonetics installed one additional shallow monitoring well (MW-10) in the vicinity of
the removed kerosene tank basin.
Stephen’s Exxon
Creston, North Carolina
Terracon Project No. 75207132
Incident No. 16457
October 19, 2022

Responsive ■ Resourceful ■ Reliable 6

Between June and July 2003, Geonetics excavated approximately 832 tons of contaminated soil
above the water table from the former UST basins and dispenser locations. Laboratory analysis
from soils collected at the bottom of the excavation area indicated the continued presence of
residual petroleum contaminants exceeding the lowest value of either the Residential and Soil-to-
Groundwater Maximum Soil Contaminant Concentrations (MSCCs) several feet below the water
table, as well as in the soil beneath the building on the property. To further delineate petroleum
contamination, Geonetics installed two additional shallow monitoring wells (MW-11 and MW-12)
around the vicinity of the on-site building.

In March 2004, the NCDENR requested a soil excavation event near the former fuel dispenser
island. Samples of soil collected from the bottom of the excavation pit yielded concentrations of
benzene, toluene, ethylbenzene, and xylenes (BTEX) in excess of Soil-to-Groundwater MSCCs.

In May 2004, Geonetics conducted a groundwater monitoring event at the site. Laboratory analysis
indicated the presence of elevated BTEX concentrations above 2L Standards in monitoring wells
MW-5 and MW-11, which are located south of the former UST basin.

In February 2011, Terraine Environmental (Terraine) conducted a groundwater monitoring event at
the site. One foot of measurable light non-aqueous phase liquid (LNAPL) was present in monitoring
well MW-11. Laboratory analysis confirmed the presence of petroleum contaminants in monitoring
wells MW-2, MW-3, MW-4, MW-7, and MW-12. However, petroleum constituents in the
groundwater samples did not contain analytes at concentrations exceeding 2L Standards.

In August 2011, Terraine returned to the site to supervise an Aggressive Fluid Vapor Recovery
(AFVR) event on monitoring well MW-11. After the event, approximately 175 gallons of petroleum
impacted groundwater were recovered. Approximately 0.2 feet of LNAPL continued to be observed
in MW-11. Laboratory analysis from groundwater sampling following the AFVR event indicated a
decrease in petroleum impact in monitoring wells MW-4 and MW-12. Following sampling, Terraine
installed a Universal Remediation, Inc., PRP Well Boom in monitoring well MW-11 in an effort to
lower petroleum contaminant concentrations.

Throughout 2012 and 2013, Crawford Environmental Services (CEM) conducted a series of
groundwater monitoring events. Measurable amounts of LNAPL continued to be observed in
monitoring well MW-11. Laboratory analysis identified detectable levels of petroleum contaminants
in monitoring wells MW-3 and MW-12.

In October 2014, ATC Associates of North Carolina, P.C. (ATC) conducted a groundwater
monitoring event. Measurable amounts of LNAPL continued to be observed in monitoring well MW-
11. Laboratory analysis from groundwater sampling identified multiple constituents exceeding 2L
Standards in monitoring well MW-5. In August 2018, ATC returned to sample monitoring wells and
identified concentrations of isopropyl ether and sec-butylbenzene below 2L Standards.
Stephen’s Exxon
Creston, North Carolina
Terracon Project No. 75207132
Incident No. 16457
October 19, 2022

Responsive ■ Resourceful ■ Reliable 7

Between March and October 2019, ATC installed five shallow monitoring wells (MW-13 through
MW-17) to further delineate the horizontal extent of the petroleum impact and installed shallow
monitoring well MW-5R near the location of MW-5 as it was no longer found on the site. Measurable
LNAPL continued to appear in monitoring well MW-11. Laboratory analysis from groundwater
sampling identified concentrations of petroleum constituents above 2L Standards in monitoring well
MW-5R. ATC concluded that there appeared to be two plumes: one associated with kerosene (near
MW-11) and another with gasoline (near MW-5R).

In August 2021, Terracon Consultants, Inc. (Terracon) conducted a Mobile Multi-Phase Extraction
(MMPE) event at monitoring well MW-7. A total of 3.77 gallons of mixed product and water were
removed from the site. Approximately 8 gallons of free product was recovered as liquid and 3.33
gallons of Volatile Organic Compounds (VOCs) were removed as vapor. After the event, no free
product was identified in any of the on-site monitoring wells.

In April 2022, Terracon and a North Carolina registered well driller, Environmental Drilling & Probing
Services (EDPS), mobilized to the site to install one recovery well (RW-1) and one air sparge well
(AS-1) in the vicinity of the kerosene plume on the west side of the on-site building. Well top-of-
casing (TOC) relative elevations for newly installed wells AS-1 and RW-1 were surveyed using a
Topcon self-leveling laser level using MW-11 as a benchmark.
Terracon personnel mobilized to the site in May 2022, to oversee the initiation of a 96-hour MMPE
and air sparge event at wells AS-1 and RW-1 by Terracon’s subcontractor Advanced Environmental
Services (AES). According to the AES field report dated June 1, 2022, a total of 2,670 gallons of a
product/water mixture were removed from the site and properly disposed at a certified North
Carolina disposal facility. Approximately 6 gallons of free product was recovered as liquid. Mass
balance calculations indicated total VOC emissions removed from the wells as vapor equated to
7.67 gallons. Subsequent to the MMPE event, Terracon mobilized to the site on May 10, 2022, to
sample monitoring wells MW-11, MW-13, and MW-14. Wells MW-11 and MW-13 reported
concentrations of contaminants above the MDLs but below the 2L Standards for volatile organic
compounds. However, field observations indicated a strong petroleum odor emanating from the
groundwater purged from monitoring well MW-11. Petroleum constituents were not reported at
concentrations exceeding the MDLs in MW-14. Volatile organic compounds (VOCs) have
significantly decreased in concentration in monitoring wells MW-11, MW-13, and MW-14 since the
September 2021 sampling event.

C.4 Water Supply Wells

Based on receptor survey information provided by Geonetics in 2012, there are four private water
supply wells (one-inactive) and five water supply springs within a 1,500-foot radius of the site. The
on-site water supply well (WSW-8) is located approximately 60 feet southwest of the former
kerosene UST release source area. Geonetics did not find evidence at the time of the assessment
Stephen’s Exxon
Creston, North Carolina
Terracon Project No. 75207132
Incident No. 16457
October 19, 2022

Responsive ■ Resourceful ■ Reliable 8
that the water supply springs or potential receptors were affected by the UST release. The locations
of the water supply wells are shown on Exhibit 3 and water supply well information is provided in
Table 1.

In 2015, ATC identified and sampled three water supply wells and springs (WSW-6, WSW-7, and
WSW-8) located within 1,000 feet from the site. Wells WSW-6 and WSW-7 are located cross-
gradient and approximately 600 feet and 950 feet from the source release, respectively. Analytical
results did not identify detectable concentrations of petroleum constituents in the tested water
supply wells. In March 2019, ATC sampled water supply wells WSW-7 and WSW-8 and did not
identify petroleum contaminants above MDLs. Historical water supply analytical groundwater results
from previous sampling events are provided in Table 2.

C.5 Surface Water

A small intermittent stream runs along the western border of the property. The North Fork of the
New River is located approximately 480 feet southeast of the former UST basin. The North Fork of
the New River is depicted as Class C, Trout Waters. Surface runoff on the site is generally to
southeast. A spring is located north of well MW-2 and is piped underground heading southeast
towards the river. Surface waters are depicted on Exhibit 1.

C.6 Land Use Information

The site is bound to the north by NC Highway 88 and single-family residences, to the east by
agricultural land and single-family residences, to the west by single-family residences, and to the
south by agricultural land and the North Fork of the New River.
D. ASSESSMENT INFORMATION

D.1 Site Geology and Hydrogeology

The following resources were reviewed to evaluate site-specific geological and hydrogeological
characteristics.

Baldwin Gap Quadrangle, North Carolina, USGS 7.5-minute series topographic map, dated
2003. (Exhibit 1).
Geologic Map of North Carolina, dated 1985.
The Geology of the Carolinas, Carolina Geological Society Fiftieth Anniversary Volume, edited by
J. Wright Horton, Jr., and Victor A. Zullo, The University of Tennessee Press, dated 1991.
Soil Survey of Ashe County, North Carolina, US Department of Agriculture, Natural Resources
Conservation Service, Web Soil Survey via the Internet, http://websoilsurvey.nrcs.usda.gov/app/
Stephen’s Exxon
Creston, North Carolina
Terracon Project No. 75207132
Incident No. 16457
October 19, 2022

Responsive ■ Resourceful ■ Reliable 9
The site is located within the Blue Ridge Physiographic Province which generally consists of tall,
high-relief topography and long northeast to southwest trending ridges with incised creeks and river
channels. According to the geologic map, the site is specifically underlain by an unconformity with
bedrock consisting of biotite granitic gneiss.

In-place chemical and physical weathering of parent rocks typically form residual soils in the Blue
Ridge region. Weathering is facilitated by the presence of fractures, joints, and less resistant
minerals in the rock. Saprolite derived from the underlying bedrock is generally thinner in the Blue
Ridge than in the Piedmont. Furthermore, soils on mountain slopes are moved down-slope by water
and gravity more readily than in the more moderately sloped Piedmont Physiographic Province,
resulting in relatively thicker colluvial deposits in valleys. According to available excavation records
for the site, soils encountered consisted of sandy silt to silty sand.

In much of the Blue Ridge, groundwater generally occurs in pore spaces within soils and in the
structural features present in the underlying rock (i.e. joints, fractures, and faults). Recharge to the
water table is primarily by precipitation infiltrating the surficial, unsaturated soils (vadose zone) and
percolating downward under the influence of gravity to the water table (saturated zone). Typically,
the water table is not a level surface, but a subdued reflection of the land surface. The depth to the
water table is not consistent and is dependent upon several factors that include the amount of
rainfall, permeability of the soil, the extent of fracturing in the underlying rock and the influences of
groundwater pumping. Groundwater typically flows in directions perpendicular to lines of equal head
and under the influence of gravity, migrates to discharge points such as surface water features, the
toes of slopes or natural springs.

Please note that fluctuations in the depth of the water table can be expected depending on
variations in precipitation, surface water run-off and other factors not evident at the time of our
subsurface exploration. Normally, the highest levels of the water table occur in late winter and
spring and the lowest levels occur in the late summer and fall. Based on groundwater elevation
measurements taken on May 10, 2022, groundwater is estimated to flow to the southeast toward
the North Fork of the New River (Classified as Class C, Trout Waters).

According to data collected from previous boring logs from the site, soils encountered consist of fill
material classified as sandy silt, followed by alluvial silty sands and gravel cobbles. Residual soils
encountered beneath the alluvium soils were classified as silt. Amphibolite bedrock has been
encountered at the site during the installation of deep well MW-7 at 30 feet below ground surface
(bgs).

D.2 Sampling Activities

Terracon mobilized to the site on September 26, 2022, to sample monitoring wells MW-4, MW-11,
and MW-13 associated with the kerosene plume and wells MW-5R, MW-15, and MW-17 associated
with the gasoline plume. Terracon gauged the monitoring wells using the electric water level meter
Stephen’s Exxon
Creston, North Carolina
Terracon Project No. 75207132
Incident No. 16457
October 19, 2022

Responsive ■ Resourceful ■ Reliable 10
with accuracy of 1/100th of a foot to collect groundwater elevation data in the sampled monitoring
wells. Depth to groundwater in the monitoring wells ranged from approximately 0.40 feet below top-
of-casing (btoc) in well MW-17 to 10.00 feet btoc in well MW-5R. Based on top of casing elevations,
groundwater flow is to the southeast. The approximate locations of the wells are shown on the Site
Diagram (Exhibit 2). A groundwater elevation map depicting groundwater flow contours and
direction is shown on Exhibit 4. Current and historical groundwater elevation measurements are
provided in Table 3.

Prior to sampling, each monitoring well was purged of a minimum of three well volumes. Purge
water from the monitoring wells was disposed on-site in accordance with NCDEQ guidelines. Each
well was allowed to recharge to a minimum of 90 percent of the original well volume before a
sample was collected. The groundwater samples were collected with a disposable plastic bailers.
The groundwater samples and a field blank were placed in laboratory-supplied glassware, labeled
and stored in an ice-packed cooler. The samples, along with chain-of-custody documentation, were
delivered to Pace Analytical Services, Inc. in Mount Juliet, Tennessee for analysis of VOCs by
Standard Method 6200B, including MTBE, EDB and IPE. The field blank and samples collected
from wells MW-4, MW-11, and MW-13 associated with the kerosene plume were also tested by
EPA Method 625 Base/ Neutrals and Acids plus 10 largest non-target peaks, MADEP VPH, and
MADEP EPH.

D.3 LNAPL Evaluation

Terracon did not detect measurable thicknesses of LNAPL in the monitoring wells. However, purge
water generated from monitoring well MW-11 had a moderate petroleum odor.
D.4 Analytical Results
In the vicinity of the kerosene plume, the groundwater samples from MW-11 and MW-13 analyzed
by Standard Method 6200B and EPA Method 625 from did not report contaminants at
concentrations exceeding the 2L Standards but did report constituents above MDLs. Both MADEP
C9-C18 Aliphatics and C9-C22 Aromatics fraction classes in the sample collected from well MW-11
exceeded the established 2L Standards. Petroleum constituents were not reported at
concentrations exceeding the MDLs in well MW-4.

In the vicinity of the gasoline plume, the groundwater sample collected from well MW-5R contained
n-propylbenzene (205 µg/L), 1,2,4-trimethylbenzene (1,020 µg/L), and total xylenes (744.5 µg/L)
exceeding the 2L Standards with other constituents above the MDLs. The groundwater sample
collected from well MW-17 contained benzene (5.03 µg/L) and naphthalene (9.77 µg/L) exceeding
the 2L Standards with other constituents above the MDLs. Petroleum constituents were not
reported at concentrations exceeding the 2L Standards in well MW-15, however some analytes
were detected above the MDLs.

While analytical results from this sampling event indicate a decrease in contaminant concentrations
Stephen’s Exxon
Creston, North Carolina
Terracon Project No. 75207132
Incident No. 16457
October 19, 2022

Responsive ■ Resourceful ■ Reliable 11
in well MW-15 at the former gasoline UST source area, an increase in contaminant concentrations
since the September 2021 sampling event are seen in wells MW-5R and MW-17. Concentrations of
contaminants in MW-17 remain below the respective North Carolina 15A NCAC 02B Water Quality
Standards for Surface Waters (NCAC 02B Standards), EPA National Recommended Water Quality
Criteria for Aquatic Life & Human Health (EPA NRWQC), and In-Stream Target Values for Surface
Waters.

The groundwater analytical results from sampled monitoring wells and historical groundwater
analytical results from previous sampling events are summarized in Table 4. The analytical results
are also depicted on Exhibit 5. Copies of the laboratory analytical reports are provided in Appendix
D.

E. AQUIFER TESTING
To evaluate aquifer properties (i.e., aquifer permeability and the potential suitability of contaminant
migration), slug tests were conducted on October 6, 2022 at four on-site monitoring well locations
(MW-5R, MW-11, MW-13, and MW-15) by introducing a solid slug of known volume into each well
and measuring the resulting change in head following the introduction (i.e., “slug-in”). A Level Troll
700 pressure transducer was used to monitor the change in head within the wells. The tests
continued until water levels recovered to at least 95 percent of the initial static level within a
reasonable time period. After the water level had returned to the approximate static level, the slug
was removed and the resulting change in head was also monitored (i.e. “slug-out” test). Hydraulic
conductivity was then estimated from slug test results using AQTESOLV Pro software. Terracon’s
field notes are provided in Appendix A. Aquifer slug test summary reports and AQTESOLV data
reports are provided in Appendix C.

Time versus water displacement data collected from slug-in (falling head) and slug-out (rising head)
tests conducted at monitoring wells MW-5R, MW-11, MW-13, and MW-15 were analyzed using the
Bower and Rice (1976) Slug Test Solution for unconfined aquifers. The falling and rising head slug
tests yielded the following hydraulic conductivities (K):

Plume Slug Test K (feet/minute)
Gasoline Plume MW-5R (slug-in) 6.37 x 10-4
MW-5R (slug-out) 6.73 x 10-4
MW-15 (slug-in) 6.48 x 10-4
MW-15 (slug-out) 6.77 x 10-4
Kerosene Plume MW-11 (slug-in) 6.37 x 10-4
MW-11 (slug-out) 6.37 x 10-4
MW-13 (slug-in) 5.39 x 10-4
MW-13 (slug-out) 6.42 x 10-4

These K values correspond to a range of 283.2 feet per year (ft/yr) to 355.8 ft/yr. The K values
Stephen’s Exxon
Creston, North Carolina
Terracon Project No. 75207132
Incident No. 16457
October 19, 2022

Responsive ■ Resourceful ■ Reliable 12
associated with the kerosene plume have an average of 322.6 ft/yr and the K values associated
with the gasoline plume have an average of 346.2 ft/yr. This range of hydraulic conductivity values
falls within the low end of the published range for silts and fine sands in Domenico and Schwartz,
1990. Previous soil borings conducted at the site noted the dominant soil lithology to be sandy silt
fill soil, silty sand and silty gravel alluvium soil, and residual silt. Given the consistency seen in slug-
in and slug-out tests performed at four separate wells, the shapes of the displacement versus time
curves (see Appendix C), and the agreement seen in fate and transport results with real world
concentration data using the average calculated hydraulic conductivity (see below), the calculated
hydraulic conductivities appear representative of on-site subsurface conditions.

F. GROUNDWATER MODELING
Terracon conducted a fate and transport evaluation of petroleum constituents detected in the on-
site monitoring wells associated with both the kerosene and gasoline plumes to determine the
potential for the constituents to migrate toward nearby receptors. The receptors analyzed were
WSW-8 and the WSW-9 which are located approximately 60 and 330 feet from the kerosene plume
and 175 and 260 feet from the gasoline plume, respectively. The risk to the North Fork of the New
River was also analyzed which is located approximately 480 feet south and down-gradient from the
site. The RBCA Tool Kit for Chemical Releases® Version 2.6 (RBCA Toolkit) used to perform the
fate and transport modeling does not have a directional input; as such, the model results evaluating
risk to WSW-8 are equally valid for WSW-9. Terracon utilized available site-specific data
(contaminant concentrations, hydraulic gradient, and hydraulic conductivity). Transport to each
receptor was modeled from two separate source areas (kerosene plume and gasoline plume).

Site Specific Model Inputs (RBCA Tool Kit)
Terracon utilized site-specific hydraulic conductivity data from the slug testing of wells associated
with both the kerosene and gasoline plumes performed by Terracon in October 2022 to simulate
natural attenuation and transport of the plumes. The model simulations to evaluate solute transport
were completed using the RBCA Toolkit. The average hydraulic conductivities of the kerosene and
gasoline plumes were estimated to be 322.6 ft/yr and 346.2 ft/yr, respectively. The average
hydraulic gradients, 0.0184 ft/ft and 0.0386 ft/ft, were estimated respectively for the areas at the
kerosene and gasoline plumes based on the historic groundwater elevations (average from the last
available sampling events). Using an estimated porosity of 0.38, the seepage velocity used by the
model was calculated as approximately 16 feet per year for the kerosene plume and 35 ft per year
for the gasoline plume. Site specific data for soil bulk density, the partition coefficient, and fraction
organic carbon were not available so the default values were used in the model simulation.

The depth to water in the source area has historically ranged from approximately 4 to 8 feet bls.
Deep monitoring well MW-7 encountered bedrock at a depth at approximately 30 feet below ground
surface. Based on the above, the plume thickness at the source area was estimated to be
approximately 26 feet.
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Creston, North Carolina
Terracon Project No. 75207132
Incident No. 16457
October 19, 2022

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Based on Mann-Kendall statistical analysis of benzene, toluene, ethylbenzene, xylene (BTEX),
naphthalene, and 1,2,4-trimethylbenzene (see Exhibits 6 through 12), contaminant concentrations
at the site are either stable, decreasing, or exhibit no trend. As such, two separate model
calibrations simulating (1) biodegradation and (2) dispersion only for contaminants of concern were
conducted to determine which model was the most appropriate for the site. According to the RBCA
Tool Kit®, biodegradation is simulated as a first-order decay process. For the biodegradation
model, the most conservative half-lives for each constituent published in The Handbook of
Environmental Degradation Rates (Howard et al., 1991) were utilized. According to the RBCA Tool
Kit®, the dispersion only model uses the steady-state Domenico analytical solute transport model to
account for dispersion between the groundwater source zone and off-site receptor locations but
does not account for biodegradation effects (a first-order decay process). While biodegradation may
be occurring within the sub-surface, exclusion of biodegradation in the model provides a more
conservative modeled result for concentrations at the point of exposure.

Initial Model Calibration for Kerosene Plume (Modeling Transport from MW-11 to MW-13)
Prior to evaluating transport from the source area to the selected receptors, Terracon utilized site-
specific concentration data from MW-11 and MW-13 to calibrate the desired model inputs (see
above) and evaluate how well either biodegradation or dispersion only models can reproduce real
world data. Concentrations of benzene, toluene, ethylbenzene, xylene (BTEX), naphthalene, and
1,2,4-trimethylbenzene detected within MW-11 during the December 2011 sampling event were
used as beginning concentrations. Contaminant concentrations at MW-13, located 40 feet directly
down-gradient from MW-11, were calculated using the models. After 11 years, the calculated
concentrations of the dispersion only model are consistent with the concentrations detected within
MW-13 during the September 2022 sampling event:

MW-13 Concentrations: Fate and Transport Model Results
vs. September 2022 Analytical Data
Constituent RBCA-Calculated
Concentrations
(Biodegradation)
RBCA-Calculated
Concentrations
(Dispersion Only)
September 2022
(MW-13)
Benzene NE NE <5
Toluene NE NE <5
Ethylbenzene NE NE <5
Total Xylenes 0.051 0.87 <10
Naphthalene 0.002 3.60 3.52
1,2,4-Trimethylbenzene 3.9 x 10-7 63 54.8
*Concentrations are given in μg/L
** NE = Not evaluated as December 2011 concentration was below laboratory method detection limits

Based on this above-described calibration, the choice of a dispersion only model appears more
appropriate to model on-site conditions than the biodegradation model.

Stephen’s Exxon
Creston, North Carolina
Terracon Project No. 75207132
Incident No. 16457
October 19, 2022

Responsive ■ Resourceful ■ Reliable 14
Initial Model Calibration for Gasoline Plume (Modeling Transport from MW-1 to MW-5R)
Terracon utilized site-specific concentration data from MW-1 and MW-5R to calibrate the desired
model inputs. Concentrations of benzene, toluene, ethylbenzene, xylene (BTEX) detected within
MW-1 during the July 1997 sampling event were used as beginning concentrations. Contaminant
concentrations at MW-5R, located 75 feet directly down-gradient from MW-1, were calculated using
the model. After 25 years, the calculated concentrations of ethylbenzene and total xylenes in the
dispersion only model are consistent with the concentrations detected within MW-5R during the
September 2022 sampling event. The calculated concentrations of benzene and toluene in the
dispersion only model calibration were significantly greater than the concentrations detected in MW-
5R in September 2022.

MW-5R Concentrations: Fate and Transport Model Results
vs. September 2022 Analytical Data
Constituent RBCA-Calculated
Concentrations
(Biodegradation)
RBCA-Calculated
Concentrations
(Dispersion Only)
September 2022
(MW-5R)
Benzene 160 390 <20
Toluene 9.2 x 10-4 610 38.3
Ethylbenzene 8 240 262
Total Xylenes 66 800 744.5
Naphthalene NE NE <100
1,2,4-Trimethylbenzene NE NE 1,020
*Concentrations are given in μg/L
** NE = Not evaluated as July 1997 concentration was below laboratory method detection limits

Based on the above, the dispersion only model should overpredict concentrations of benzene and
toluene and therefore is sufficiently conservative to evaluate risk for selected distances to receptors.
The choice of a dispersion only model appears more appropriate to model on-site conditions than
the biodegradation model.

Fate and Transport Model
Concentrations of benzene, toluene, ethylbenzene, total xylenes identified within MW-11 and MW-
15 during the September 2022 sampling event were used as the contaminant concentrations in the
source area to populate the dispersion only model. The data and inputs used for the model are
described above and are also indicated on the input screen included in Appendix C.

Fate and Transport Model Results (Source Areas to WSW-8)
Well WSW-8 is located approximately 60 feet down-gradient from the kerosene source area and
approximately 175 feet cross gradient from the gasoline source area. A dispersion only model was
generated to evaluate contamination risk from each source to WSW-8. The dispersion only model
indicates that the steady-state concentrations of BTEX constituents calculated to exist at the point
of exposure (POE) range from 130 µg/L (total xylenes) to 3.5 µg/L (naphthalene). The selected
constituents of concern are not reported as carcinogenic and the hazard indexes (8.0 x 10-2 and 1.7
Stephen’s Exxon
Creston, North Carolina
Terracon Project No. 75207132
Incident No. 16457
October 19, 2022

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x 10-1 for the kerosene and gasoline plumes, respectively) for the point of exposure is lower than
NCDEQ’s acceptable risk tolerance of 1 µg/L. The dispersion only model calculates the following
concentrations to exist at WSW-8 after 20 years and at steady state conditions:

Calculated Concentrations at WSW-8
Constituent Kerosene Source Gasoline Source
2L
Standard Calculated Concentrations After 20 Years Steady State Concentrations Calculated Concentrations After 20 Years Steady State Concentrations Benzene NE NE NE NE 1
Toluene NE NE 8.9 9.0 600
Ethylbenzene NE NE 64 67 600
Total Xylenes NE NE 120 130 500
Naphthalene 2.8 3.5 NE NE 6
1,2,4-
Trimethylben
zene
52 54 18 64 400
*Concentrations are given in μg/L
** NE = Not evaluated as September 2022 concentration was below laboratory method detection
limits

Fate and Transport Model Results (Source Areas to WSW-9)
Well WSW-9 is located approximately 330 feet up-gradient from the kerosene source area and
approximately 260 feet up-gradient from the gasoline source area. A dispersion only model was
generated to evaluate contamination risk from each source to WSW-9. The model indicates that the
steady-state concentrations of the above selected constituents are calculated to exist at WSW-9
range from 70 µg/L (total xylenes) to 0.61 µg/L (naphthalene). The selected constituents of concern
are not reported as carcinogenic and the hazard indexes (1.4 x 10-2 and 9.5 x 10-2 for the kerosene
and gasoline plumes, respectively) for the point of exposure is many orders of magnitude lower than
NCDEQ’s acceptable risk tolerance of 1 µg/L. The dispersion only model calculates the following
concentrations to exist at WSW-9 after 20 years and at steady state conditions.

Stephen’s Exxon
Creston, North Carolina
Terracon Project No. 75207132
Incident No. 16457
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Calculated Concentrations at WSW-9
Constituent Kerosene Source Gasoline Source
2L
Standard Calculated Concentrations After 20 Years Steady State Concentrations Calculated Concentrations After 20 Years Steady State Concentrations Benzene NE NE NE NE 1
Toluene NE NE 4.3 4.9 600
Ethylbenzene NE NE 29 37 600
Total Xylenes NE NE 51 70 500
Naphthalene 0.00049 0.61 NE NE 6
1,2,4-
Trimethylbenzene
0.19 9.5 2.5 35 400
*Concentrations are given in μg/L
** NE = Not evaluated as September 2022 concentration was below laboratory method detection
limits

Fate and Transport Model Results (Source Areas to North Fork of New River)
The North Fork of the New River is located approximately 480 feet down-gradient from both the
kerosene and gasoline source areas. A dispersion only model was generated to evaluate
contamination risk from each source to the receptor. The model indicates that the steady-state
concentrations of the above selected constituents are calculated to exist at the receptor range from
23 µg/L (total xylenes) to 3.4 x 10-6 µg/L (naphthalene), which fall below the reported standards for
each contaminant for Class C surface waters. The dispersion only model calculates the following
concentrations to exist at the receptor after 20 years and at steady state conditions:

Stephen’s Exxon
Creston, North Carolina
Terracon Project No. 75207132
Incident No. 16457
October 19, 2022

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Calculated Concentrations at North Fork of the New River
Constituent Kerosene Source Gasoline Source
Established
Standard for
Class C Waters
(NCAC 02B,
EPA NRWQC,
or In-Stream
Target Value) Calculated Concentrations After 20 Years Steady State Concentrations Calculated Concentrations After 20 Years Steady State Concentrations Benzene NE NE NE NE 51
Toluene NE NE 0.67 1.6 11
Ethylbenzene NE NE 3.4 6.7 130
Total Xylenes NE NE 5.1 23 670
Naphthalene 3.4 x 10-6 0.31 NE NE 12
1,2,4-
Trimethylben
zene
6.2 x 10-3 4.8 0.015 12 390
*Concentrations are given in μg/L
** NE = Not evaluated as September 2022 concentration was below laboratory method detection
limits
*** Standards derived from North Carolina 15A NCAC 02B Water Quality Standards for Surface
Waters (NCAC 02B Standards), EPA National Recommended Water Quality Criteria for Aquatic Life
& Human Health (EPA NRWQC), and In-Stream Target Values for Surface Waters.

Fate and Transport Model Summary
Summaries of the model results are provided in Appendix D. Based on the dispersion only model,
which appears to simulate contaminant transport and degradation between both the kerosene and
gasoline source areas to each receptor accurately, it appears that each receptor has the potential to
be impacted by the releases at the site, but not above levels exceeding the 2L Standards. The
potential risk to the North Fork of the New River (located 480 feet and down-gradient of each source
area) with calculated contaminant concentrations reported at levels below the reported standards
for Class C surface waters.
G. CONCLUSIONS AND RECOMMENDATIONS
Based on information obtained during the completion of our assessment activities, Terracon
provides the following conclusions and findings.

Groundwater flow is estimated to be towards the southeast.
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Terracon Project No. 75207132
Incident No. 16457
October 19, 2022

Responsive ■ Resourceful ■ Reliable 18
There are four private water supply wells and five water supply springs within a 1,500-foot radius
of the site. One of the private water supply wells is on-site and down-gradient of the source
releases. Municipal water is not available to the site or the immediately surrounding properties.
In the vicinity of the kerosene plume, the groundwater samples from MW-11 and MW-13
analyzed by Standard Method 6200B and EPA Method 625 from did not report contaminants at
concentrations exceeding the 2L Standards but did report constituents above MDLs. Petroleum
constituents were not reported at concentrations exceeding the MDLs in well MW-4.
Both MADEP C9-C18 Aliphatics and C9-C22 Aromatics fraction classes in the sample collected
from well MW-11 in the vicinity of the kerosene plume exceeded the established 2L Standards.
In the vicinity of the gasoline plume, the groundwater sample collected from well MW-5R and
MW-17 contained constituents exceeding the 2L Standards with other constituents above the
MDLs. Petroleum constituents were not reported at concentrations exceeding the 2L Standards
in well MW-15, however some analytes were detected above the MDLs.
The dispersion only model appears to simulate contaminant transport and degradation between
the source areas to downgradient wells accurately.
Based on the dispersion only model, contaminant concentrations are not predicted to exceed the
2L Standards when steady state conditions are achieved. However, each receptor has the
potential to be impacted by contaminants at levels below the 2L Standards.
Based on the historical presence of measurable free product in MW-11, free phase product may
still be present within the soil pores in the vicinity of the kerosene release and may continue to
reappear in the well until soil is excavated.
Based on the data presented in this monitoring report, Terracon recommends the following activities
be completed at the site.

Considering water supply well WSW-8 is approximately 60 feet down-gradient of the kerosene
plume at the site, Terracon recommends considering seeking a water supply well abandonment
agreement for WSW-8 for closure of the well in accordance with 15A NCAC 2C rules if
permission is given by the property owner. An alternative water supply source for the property
may need to be established with the property owner prior to abandonment.
Consider collecting soil samples in the vicinity of the former kerosene UST to assess if additional
soil excavation is necessary.
Continue to monitor the wells in the vicinity of the kerosene plume for levels of free product and
sample the on-site and surrounding water supply wells on a semi-annual basis.

EXHIBITS
TOPOGRAPHIC MAP IMAGE COURTESY OF THE U.S. GEOLOGICAL SURVEY QUADRANGLES INCLUDE: BALDWIN GAP, NC (1/1/2003).
Topographic Map
NCDEQ 2020-2023: Stephens Exxon
Incident #: 16457
20655 North Carolina Highway 88 West
Creston, Ashe County, North Carolina
7327 W Friendly Ave Ste G
Greensboro, NC 27410-6253
75207132
DIAGRAM IS FOR GENERAL LOCATION ONLY,
AND IS NOT INTENDED FOR CONSTRUCTION PURPOSES
Project Manager:
Drawn by:
Checked by:
Approved by:
FCD
FCD
EW
FCD
75207126
October 2022
Project No.
File Name:
Date:
1
Exhibit
1”=2,000’ Scale:
APPROXIMATE
SITE BOUNDARY
@A
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@A
@A
@A
@A@A
@A
&<
MW-10
MW-6MW-1MW-12
MW-15
MW-2
MW-3
MW-13MW-14
MW-11 MW-4
MW-7 MW-5R
MW-17
MW-16
MW-8
RW-1AS-1
WSW-8
EXHIBIT NO.
File Path:
Date:
PM:
Drawn By:
Checked By:
Approved By:
Project No.
Scale:
2
75207132FCD
FCD
FCD
EW 7327-G West Friendly Avenue Greensboro, NC 27410Phone: [phone] Fax: [phone]
Site Diagram
NCDEQ 2020-2023: Stephens ExxonIncident #: 1645720655 North Carolina Highway 88 WestCreston, Ashe County, North Carolina
Note: All monitoring well, water supplywell, and former UST locations havebeen approximated based on siteobservations and data received fromNCDEQ.
MW-9 location not pictured.
Legend
&<Lost Well
@A Water Supply Well
@A Monitoring Well
Former Kerosene USTFormer Gasoline UST Site BoundaryAshe County Parcel Boundary05010025Feet
As Shown
October 2022 NC HIGHWAY 88 WESTStephens Exxon FORMER JOE STEPHENSEXXON

Water Supply Well Map
7327 W Friendly Ave Ste G
Greensboro, NC 27410-6253
75207132 AERIAL PHOTOGRAPHY PROVIDED BY
MICROSOFT BING MAPS
NCDEQ 2020-2023: Stephens Exxon
Incident #: 16457
20655 North Carolina Highway 88 West
Creston, Ashe County, North Carolina

DIAGRAM IS FOR GENERAL LOCATION ONLY, AND IS NOT INTENDED FOR CONSTRUCTION PURPOSES
Project Manager:
Drawn by:
Checked by:
Approved by:
FCD
FCD
EW
FCD
75207132
October 2022
Scale:
Project No.
File Name:
Date:
AS SHOWN 3
Exhibit
@A
@A@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A@A
@A
&<
95
WSW-891'96
MW-11(91.73)
MW-4(92.53)
MW-10MW-3(96.30)
MW-14(91.89)
RW-1(NM)AS-1(NM)
MW-7(NM)MW-2MW-2MW-1(NM)
MW-15(92.94)
MW-6(NM)
MW-5R(91.19)
MW-16(86.93)
MW-17(88.39)
MW-8(NM)
MW-2(96.26)
MW-12(94.30)9692'
94 93
92
92
90
87
91
898788
MW-13(92.97)
EXHIBIT NO.
File Path:
Date:
PM:
Drawn By:
Checked By:
Approved By:
Project No.
Scale:
4
75207132FCD
FCD
FCD
EW 7327-G West Friendly Avenue Greensboro, NC 27410Phone: [phone] Fax: [phone]
Groundwater Elevation Contour Map(October 2022)
NCDEQ 2020-2023: Stephens ExxonIncident #: 1645720655 North Carolina Highway 88 WestCreston, Ashe County, North Carolina
NM = Not Measured
MW-9 location (not pictured)approximated ± 500' from southeastbuilding corner.
Legend
&<Lost Well
@A Water Supply Well
@A Monitoring WellGroundwater ContourGroundwater Flow DirectionFormer Kerosene USTFormer Gasoline UST Site BoundaryAshe County Parcel Boundary05010025Feet
As Shown
October 2022NC HIGHWAY 88 WESTStephens Exxon
@A
@A@A
@A
@A
@A
@A
@A
@A
@A
@A
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&<
MW-10
MW-6MW-1MW-12
MW-15
MW-2
MW-3
MW-13MW-14
MW-11 MW-4
MW-7 MW-5R
MW-17
MW-16
MW-8
RW-1AS-1
WSW-8
EXHIBIT NO.
File Path:
Date:
PM:
Drawn By:
Checked By:
Approved By:
Project No.
Scale:
5
75207132FCD
FCD
FCD
EW 7327-G West Friendly Avenue Greensboro, NC 27410Phone: [phone] Fax: [phone]
Groundwater Analytical Results (Sept 2022)
NCDEQ 2020-2023: Stephens ExxonIncident #: 1645720655 North Carolina Highway 88 WestCreston, Ashe County, North Carolina
Legend
&<Lost Well
@A Water Supply Well
@A Monitoring Well
Former Kerosene USTFormer Gasoline UST Site BoundaryAshe County Parcel Boundary05010025Feet
As Shown
Sept 2022
MW-11VOCs by 6200B1,2,4-Trimethylbenzene = 54.8 μg/LSVOCs by 625.1Napthalene = 3.52 μg/LTPH by MADEP EPH and VPHC9-C18 Aliphatics =14,380 μg/LC19-C36 Aliphatics = 282 μg/LC9-C22 Aromatics = 3,300 μg/L
Bold indicates values detected exceeding the 2L StandardNC HIGHWAY 88 WESTStephens Exxon FORMER JOE STEPHENSEXXONMW-13VOCs by 6200B1,2,4-Trimethylbenzene = 11.5 μg/LSVOCs by 625.1All constituents reported belowlaboratory method detection limitsTPH by MADEP EPH and VPHC9-C18 Aliphatics =151 μg/LC9-C22 Aromatics = 142 μg/L
MW-4VOCs by 6200BAll constituents reported belowlaboratory method detection limitsSVOCs by 625.1All constituents reported belowlaboratory method detection limitsTPH by MADEP EPH and VPHAll constituents reported belowlaboratory method detection limits
MW-15VOCs by 6200BToluene = 18.8 μg/LEthylbenzene = 140 μg/LTotal Xylenes = 268 μg/Ln-Propylbenzene = 22.6 μg/L1,2,4-Trimethylbenzene = 134 μg/L1,3,5-Trimethylbenzene = 34.4 μg/L
MW-5RVOCs by 6200BToluene = 38.3 μg/LEthylbenzene = 262 μg/LTotal Xylenes = 744.5 μg/Ln-Butylbenzene = 38 μg/LIsopropylbenzene = 50.2 μg/Ln-Propylbenzene = 205 μg/L1,2,4-Trimethylbenzene = 1,020 μg/L1,3,5-Trimethylbenzene = 272 μg/L
MW-17VOCs by 6200BBenzene = 5.03 μg/LToluene = 2.24 μg/LEthylbenzene = 40.3 μg/LTotal Xylenes =72.66 μg/LDi-Isopropyl Ether =1.14 μg/LNapthalene =9.77 μg/LIsopropylbenzene = 2.89 μg/Ln-Propylbenzene = 8.36 μg/L1,2,4-Trimethylbenzene = 53.8 μg/L1,3,5-Trimethylbenzene = 5.7 μg/L
Evaluation Date:Job ID:
Facility Name:Constituent:
Conducted By:Concentration Units:ug/L
Sampling Point ID:MW-4 MW-11 MW-13 MW-5R MW-15 MW-17
Sampling Sampling
Event Date
1 8-Jul-97 ND ND 393
2 6-Mar-98 ND 573
3 25-Jan-99 ND
4 27-Apr-04 ND 243
5 15-Feb-11 ND
6 11-Aug-11 ND
7 2-Dec-11 ND ND
8 22-Jun-12 ND FP
9 29-Jan-13 ND FP
10 29-Oct-14 ND FP 42
11 9-Aug-17 ND FP
12 19-Mar-19 ND FP ND ND
13 9-Oct-19 ND FP ND ND 0.66 3.5
14 28-Sep-21 ND FP ND ND ND ND
15 13-May-22 ND ND
16 26-Sep-22 ND ND ND ND ND 5.03
17
18
19
20Coefficient of Variation:0.72 0.25
Mann-Kendall Statistic (S):-4 1
Confidence Factor:83.3%
Concentration Trend:Stable
Notes:
1.At least four independent sampling events per well are required for calculating the trend.Methodology is valid for 4 to 40 samples.
2.Confidence in Trend = Confidence (in percent) that constituent concentration is increasing (S>0) or decreasing (S<0): >95% = Increasing or Decreasing;
≥ 90% = Probably Increasing or Probably Decreasing; < 90% and S>0 = No Trend; < 90%, S≤0, and COV ≥ 1 = No Trend; < 90% and COV < 1 = Stable.
3.Methodology based on "MAROS: A Decision Support System for Optimizing Monitoring Plans", J.J. Aziz, M. Ling, H.S. Rifai, C.J. Newell, and J.R. Gonzales,
Ground Water , 41(3):355-367, 2003.
DISCLAIMER: The GSI Mann-Kendall Toolkit is available "as is". Considerable care has been exercised in preparing this software product; however, no party, including without
limitation GSI Environmental Inc., makes any representation or warranty regarding the accuracy, correctness, or completeness of the information contained herein, and no such
party shall be liable for any direct, indirect, consequential, incidental or other damages resulting from the use of this product or the information contained herein. Information in
this publication is subject to change without notice. GSI Environmental Inc., disclaims any responsibility or obligation to update the information contained herein.
GSI MANN-KENDALL TOOLKIT
for Constituent Trend Analysis
C. Driscoll
75207132
GSI Environmental Inc., www.gsi-net.com
BENZENE CONCENTRATION (ug/L)
11-Aug-22
Stephens Exxon Benzene
0.1
1
10
100
1000
01/00 09/13 05/27 01/41 10/54 06/68 02/82 10/95 07/09 03/23 11/36Concentration (ug/L)Sampling Date
MW-4
MW-11
MW-13
MW-5R
MW-15
MW-17
Exhibit 6: Mann Kendall Analysis – Benzene
Evaluation Date:Job ID:
Facility Name:Constituent:
Conducted By:Concentration Units:ug/L
Sampling Point ID:MW-4 MW-11 MW-13 MW-5R MW-15 MW-17
Sampling Sampling
Event Date
1 8-Jul-97 1016
2 6-Mar-98 5162
3 25-Jan-99
4 27-Apr-04 136 3580
5 15-Feb-11
6 11-Aug-11
7 2-Dec-11 0.1
8 22-Jun-12 FP
9 29-Jan-13 FP
10 29-Oct-14 ND FP 120
11 9-Aug-17 ND FP
12 19-Mar-19 ND FP 6 470
13 9-Oct-19 FP ND 160 3.1 14.1
14 28-Sep-21 FP ND 48 121 ND
15 13-May-22 ND ND
16 26-Sep-22 ND ND ND 38.3 18.8 2.24
17
18
19
20Coefficient of Variation:1.41 1.48 1.34 1.03
Mann-Kendall Statistic (S):-1 -20 1 -1
Confidence Factor:99.3%
Concentration Trend:Decreasing
Notes:
1.At least four independent sampling events per well are required for calculating the trend.Methodology is valid for 4 to 40 samples.
2.Confidence in Trend = Confidence (in percent) that constituent concentration is increasing (S>0) or decreasing (S<0): >95% = Increasing or Decreasing;
≥ 90% = Probably Increasing or Probably Decreasing; < 90% and S>0 = No Trend; < 90%, S≤0, and COV ≥ 1 = No Trend; < 90% and COV < 1 = Stable.
3.Methodology based on "MAROS: A Decision Support System for Optimizing Monitoring Plans", J.J. Aziz, M. Ling, H.S. Rifai, C.J. Newell, and J.R. Gonzales,
Ground Water, 41(3):355-367, 2003.
DISCLAIMER: The GSI Mann-Kendall Toolkit is available "as is". Considerable care has been exercised in preparing this software product; however, no party, including without
limitation GSI Environmental Inc., makes any representation or warranty regarding the accuracy, correctness, or completeness of the information contained herein, and no such
party shall be liable for any direct, indirect, consequential, incidental or other damages resulting from the use of this product or the information contained herein. Information in
this publication is subject to change without notice. GSI Environmental Inc., disclaims any responsibility or obligation to update the information contained herein.
TOLUENE CONCENTRATION (ug/L)
GSI Environmental Inc., www.gsi-net.com
GSI MANN-KENDALL TOOLKIT
for Constituent Trend Analysis
11-Aug-22 75207132
Stephens Exxon Toluene
C. Driscoll
0.1
1
10
100
1000
10000
01/00 09/13 05/27 01/41 10/54 06/68 02/82 10/95 07/09 03/23 11/36Concentration (ug/L)Sampling Date
MW-4
MW-11
MW-13
MW-5R
MW-15
MW-17
Exhibit 7: Mann Kendall Analysis –Toluene
Evaluation Date:Job ID:
Facility Name:Constituent:
Conducted By:Concentration Units:ug/L
Sampling Point ID:MW-4 MW-11 MW-13 MW-5R MW-15 MW-17
Sampling Sampling
Event Date
1 8-Jul-97 ND 519
2 6-Mar-98 1112
3 25-Jan-99
4 27-Apr-04
5 15-Feb-11
6 11-Aug-11
7 2-Dec-11 ND
8 22-Jun-12 FP
9 29-Jan-13 FP
10 29-Oct-14 ND FP 240
11 9-Aug-17 ND FP
12 19-Mar-19 ND FP 1.7 2000
13 9-Oct-19 FP ND 682 22.3 210
14 28-Sep-21 FP ND 249 788 ND
15 13-May-22 ND ND
16 26-Sep-22 ND ND ND 262 140 40.3
17
18
19
20Coefficient of Variation:0.89 1.30 0.96
Mann-Kendall Statistic (S):-3 1 -1
Confidence Factor:61.4%
Concentration Trend:Stable
Notes:
1.At least four independent sampling events per well are required for calculating the trend.Methodology is valid for 4 to 40 samples.
2.Confidence in Trend = Confidence (in percent) that constituent concentration is increasing (S>0) or decreasing (S<0): >95% = Increasing or Decreasing;
≥ 90% = Probably Increasing or Probably Decreasing; < 90% and S>0 = No Trend; < 90%, S≤0, and COV ≥ 1 = No Trend; < 90% and COV < 1 = Stable.
3.Methodology based on "MAROS: A Decision Support System for Optimizing Monitoring Plans", J.J. Aziz, M. Ling, H.S. Rifai, C.J. Newell, and J.R. Gonzales,
Ground Water, 41(3):355-367, 2003.
DISCLAIMER: The GSI Mann-Kendall Toolkit is available "as is". Considerable care has been exercised in preparing this software product; however, no party, including without
limitation GSI Environmental Inc., makes any representation or warranty regarding the accuracy, correctness, or completeness of the information contained herein, and no such
party shall be liable for any direct, indirect, consequential, incidental or other damages resulting from the use of this product or the information contained herein. Information in
this publication is subject to change without notice. GSI Environmental Inc., disclaims any responsibility or obligation to update the information contained herein.
ETHYLBENZENE CONCENTRATION (ug/L)
GSI Environmental Inc., www.gsi-net.com
GSI MANN-KENDALL TOOLKIT
for Constituent Trend Analysis
11-Aug-22 75207132
Stephens Exxon Ethylbenzene
C. Driscoll
1
10
100
1000
10000
01/00 09/13 05/27 01/41 10/54 06/68 02/82 10/95 07/09 03/23 11/36Concentration (ug/L)Sampling Date
MW-4
MW-11
MW-13
MW-5R
MW-15
MW-17
Exhibit 8: Mann Kendall Analysis –Ethylbenzene
Evaluation Date:Job ID:
Facility Name:Constituent:
Conducted By:Concentration Units:ug/L
Sampling Point ID:MW-4 MW-11 MW-13 MW-5R MW-15 MW-17
Sampling Sampling
Event Date
1 8-Jul-97 1578
2 6-Mar-98 6253
3 25-Jan-99
4 27-Apr-04 318 6270
5 15-Feb-11
6 11-Aug-11
7 2-Dec-11 0.93
8 22-Jun-12
9 29-Jan-13
10 29-Oct-14 ND 1140
11 9-Aug-17 ND
12 19-Mar-19 ND 6.3 7600
13 9-Oct-19 ND 2360 64 487
14 28-Sep-21 ND 737 1255 ND
15 13-May-22 ND ND
16 26-Sep-22 ND ND ND 744.5 268 72.66
17
18
19
20Coefficient of Variation:1.41 0.86 1.20 1.05
Mann-Kendall Statistic (S):-1 -8 1 -1
Confidence Factor:80.1%
Concentration Trend:Stable
Notes:
1.At least four independent sampling events per well are required for calculating the trend.Methodology is valid for 4 to 40 samples.
2.Confidence in Trend = Confidence (in percent) that constituent concentration is increasing (S>0) or decreasing (S<0): >95% = Increasing or Decreasing;
≥ 90% = Probably Increasing or Probably Decreasing; < 90% and S>0 = No Trend; < 90%, S≤0, and COV ≥ 1 = No Trend; < 90% and COV < 1 = Stable.
3.Methodology based on "MAROS: A Decision Support System for Optimizing Monitoring Plans", J.J. Aziz, M. Ling, H.S. Rifai, C.J. Newell, and J.R. Gonzales,
Ground Water, 41(3):355-367, 2003.
DISCLAIMER: The GSI Mann-Kendall Toolkit is available "as is". Considerable care has been exercised in preparing this software product; however, no party, including without
limitation GSI Environmental Inc., makes any representation or warranty regarding the accuracy, correctness, or completeness of the information contained herein, and no such
party shall be liable for any direct, indirect, consequential, incidental or other damages resulting from the use of this product or the information contained herein. Information in
this publication is subject to change without notice. GSI Environmental Inc., disclaims any responsibility or obligation to update the information contained herein.
XYLENES (TOTAL) CONCENTRATION (ug/L)
GSI Environmental Inc., www.gsi-net.com
GSI MANN-KENDALL TOOLKIT
for Constituent Trend Analysis
11-Aug-22 75207132
Stephens Exxon Xylenes (Total)
C. Driscoll
0.1
1
10
100
1000
10000
01/00 09/13 05/27 01/41 10/54 06/68 02/82 10/95 07/09 03/23 11/36Concentration (ug/L)Sampling Date
MW-4
MW-11
MW-13
MW-5R
MW-15
MW-17
Exhibit 9: Mann Kendall Analysis –Xylenes (Total)
Evaluation Date:Job ID:
Facility Name:Constituent:
Conducted By:Concentration Units:ug/L
Sampling Point ID:MW-4 MW-11 MW-13 MW-5R MW-15 MW-17
Sampling Sampling
Event Date
1 8-Jul-97
2 6-Mar-98 168
3 25-Jan-99 583
4 27-Apr-04 97.9
5 15-Feb-11 1.3 180
6 11-Aug-11
7 2-Dec-11 44
8 22-Jun-12
9 29-Jan-13
10 29-Oct-14 ND 110
11 9-Aug-17 ND
12 19-Mar-19 ND 3.7 530
13 9-Oct-19 2.2 195 6.1 55.7
14 28-Sep-21 ND ND ND ND
15 13-May-22 ND ND
16 26-Sep-22 ND 3.52 ND ND ND 9.77
17
18
19
20Coefficient of Variation:1.22 0.36 0.77 0.99
Mann-Kendall Statistic (S):-3 -1 1 -1
Confidence Factor:50.0%
Concentration Trend:No Trend
Notes:
1.At least four independent sampling events per well are required for calculating the trend.Methodology is valid for 4 to 40 samples.
2.Confidence in Trend = Confidence (in percent) that constituent concentration is increasing (S>0) or decreasing (S<0): >95% = Increasing or Decreasing;
≥ 90% = Probably Increasing or Probably Decreasing; < 90% and S>0 = No Trend; < 90%, S≤0, and COV ≥ 1 = No Trend; < 90% and COV < 1 = Stable.
3.Methodology based on "MAROS: A Decision Support System for Optimizing Monitoring Plans", J.J. Aziz, M. Ling, H.S. Rifai, C.J. Newell, and J.R. Gonzales,
Ground Water, 41(3):355-367, 2003.
DISCLAIMER: The GSI Mann-Kendall Toolkit is available "as is". Considerable care has been exercised in preparing this software product; however, no party, including without
limitation GSI Environmental Inc., makes any representation or warranty regarding the accuracy, correctness, or completeness of the information contained herein, and no such
party shall be liable for any direct, indirect, consequential, incidental or other damages resulting from the use of this product or the information contained herein. Information in
this publication is subject to change without notice. GSI Environmental Inc., disclaims any responsibility or obligation to update the information contained herein.
NAPHTHALENE CONCENTRATION (ug/L)
GSI Environmental Inc., www.gsi-net.com
GSI MANN-KENDALL TOOLKIT
for Constituent Trend Analysis
11-Aug-22 75207132
Stephens Exxon Naphthalene
C. Driscoll
1
10
100
1000
01/00 09/13 05/27 01/41 10/54 06/68 02/82 10/95 07/09 03/23 11/36Concentration (ug/L)Sampling Date
MW-4
MW-11
MW-13
MW-5R
MW-15
MW-17
Exhibit 10: Mann Kendall Analysis –Naphthalene
Evaluation Date:Job ID:
Facility Name:Constituent:
Conducted By:Concentration Units:ug/L
Sampling Point ID:MW-4 MW-11 MW-13 MW-5R MW-15 MW-17
Sampling Sampling
Event Date
1 8-Jul-97
2 6-Mar-98
3 25-Jan-99
4 27-Apr-04
5 15-Feb-11 3.6
6 11-Aug-11 ND
7 2-Dec-11 ND 190
8 22-Jun-12 0.27 FP
9 29-Jan-13 ND FP
10 29-Oct-14 ND FP 690
11 9-Aug-17 ND FP
12 19-Mar-19 ND FP 20 6400
13 9-Oct-19 FP 10.9 1790 38.7 353
14 28-Sep-21 FP 14 630 584 2
15 13-May-22 5.73 11.8
16 26-Sep-22 ND 54.8 11.5 1020 134 53.8
17
18
19
20Coefficient of Variation:1.22 1.14 0.27 1.16 1.15 1.39
Mann-Kendall Statistic (S):-1 -1 -4 -2 1 -1
Confidence Factor:75.8%59.2%
Concentration Trend:Stable No Trend
Notes:
1.At least four independent sampling events per well are required for calculating the trend.Methodology is valid for 4 to 40 samples.
2.Confidence in Trend = Confidence (in percent) that constituent concentration is increasing (S>0) or decreasing (S<0): >95% = Increasing or Decreasing;
≥ 90% = Probably Increasing or Probably Decreasing; < 90% and S>0 = No Trend; < 90%, S≤0, and COV ≥ 1 = No Trend; < 90% and COV < 1 = Stable.
3.Methodology based on "MAROS: A Decision Support System for Optimizing Monitoring Plans", J.J. Aziz, M. Ling, H.S. Rifai, C.J. Newell, and J.R. Gonzales,
Ground Water, 41(3):355-367, 2003.
DISCLAIMER: The GSI Mann-Kendall Toolkit is available "as is". Considerable care has been exercised in preparing this software product; however, no party, including without
limitation GSI Environmental Inc., makes any representation or warranty regarding the accuracy, correctness, or completeness of the information contained herein, and no such
party shall be liable for any direct, indirect, consequential, incidental or other damages resulting from the use of this product or the information contained herein. Information in
this publication is subject to change without notice. GSI Environmental Inc., disclaims any responsibility or obligation to update the information contained herein.
1,2,4-TRIMETHYLBENZENE CONCENTRATION (ug/L)
GSI Environmental Inc., www.gsi-net.com
GSI MANN-KENDALL TOOLKIT
for Constituent Trend Analysis
11-Aug-22 75207132
Stephens Exxon 1,2,4-Trimethylbenzene
C. Driscoll
0.1
1
10
100
1000
10000
01/00 09/13 05/27 01/41 10/54 06/68 02/82 10/95 07/09 03/23 11/36Concentration (ug/L)Sampling Date
MW-4
MW-11
MW-13
MW-5R
MW-15
MW-17
Exhibit 11: Mann Kendall Analysis –1,2,4-Trimethylbenzene

TABLES
Table 1
Water Supply Well and Spring Information
Stephens Exxon
20655 US Highway 88 West
Creston, Ashe County, North Carolina
NCDEQ Incident No. 16457
Terracon Project No. 75207132
Well ID*Property Owner Property Address / Owner Mailing
Address Owner Address Use distance (ft)Direction
WSW-1 JIMMY DEAN POTTER 20473 NC HWY 88 W, CRESTON,
NC 28615
1197 FINGER BRIDGE RD
HICKORY, NC 28602
Potable Water,
Spring 1,000 East
WSW-2 MARY BELL WINEBARGER 19998 NC HWY 88 W, CRESTON,
NC 28615
1085 BRUSHY FORK RD
CRESTON, NC 28615
Potable Water,
Spring 1,300 Northeast
WSW-3 MARY BELL WINEBARGER 20410 NC HWY 88 W, CRESTON,
NC 28615
165 MEADOW RIDGE RD
BOONE, NC 28607
Potable Water,
Well 1,100 Northeast
WSW-4 CARL GRANT STEPHENS 20498 NC HWY 88 W, CRESTON,
NC 28615
20498 NC HIGHWAY 88 W, CRESTON, NC
28615
Potable Water,
Well 850 Northeast
WSW-5 EUGENE & FAYE M WARD 749 GREEN VALLEY RD,
CRESTON, NC 28615
749 GREEN VALLEY RD
CRESTON, NC 28615
Potable Water,
Spring 1,670 Northwest
WSW-6 JACK PRICE 20794 NC HWY 88 W, CRESTON,
NC 28615
20794 NC HIGHWAY 88 W
CRESTON, NC 28615
Potable Water,
Spring 600 South
WSW-7 BOB W & DARLENE J CORNETT 20871 NC HWY 88 W, CRESTON,
NC 28615
20871 NC HIGHWAY 88 W
CRESTON, NC 28615
Potable Water,
Well 950 South
WSW-8 VINCENT & COURTNEY BOCCARDY 20655 NC HWY 88 W, CRESTON,
NC 28615
420 BARLOW RD
CRESTON, NC 28615
Potable Water,
Well On-site On-site
WSW-9 STEPHENS THOMAS EARL 166 GREEN VALLEY RD,
CRESTON, NC 28615
166 GREEN VALLEY RD
CRESTON, NC 28615
Potable Water,
Spring 320 North
WSW-10 JIMMY R & SHIRLEY D SORRELL 20700 NC HWY 88 W, CRESTON,
NC 28615
7220 DENLEE RD
RALEIGH, NC 27603
Potable Water,
Spring 440 Northwest
WSW-11 ARTHUR EUGENE & TRULA WARD 239 GREEN VALLEY RD,
CRESTON, NC 28615
749 GREEN VALLEY RD
CRESTON, NC 28615
Potable Water,
Spring 1,250 Northwest
1 of 1
BenzeneTolueneEthylbenzeneTotal XylenesMethyl-tert-Butyl EtherIsopropyl EtherElthylene DibromideNapthaleneAcetonen-Butylbenzenesec-Butylbenzenetert-ButylbenzeneChloroformIsopropylbenzenen-Propylbenzene1,2,4-Trimethylbenzene1,3,5-Trimethylbenzene4-IsopropyltolueneLeadC5-C8 AlyphaticsC9-C18 AliphaticsC19-C36 AliphaticsC9-C22 Aromatics1 600 600 500 20 70 0.02 6 6000 70 70 70 70 70 70 400 400 20 15 400 700 10000 200
5000 260000 84500 85500 20000 70000 50 6000 6000000 6900 8500 15000 70000 25000 30000 28500 25000 20000 15000 NE NE NE NE
7/8/1997 ND ND ND ND 1.5 ND NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
8/11/2011
2/15/2011 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND
8/11/2011 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA ND ND ND ND
12/2/2011
6/22/2012 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA ND ND ND ND
2/15/2011 ND ND ND ND ND ND ND ND ND ND ND ND 0.71 ND ND ND ND ND 12 ND ND ND ND
8/11/2011 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA ND ND ND ND
12/2/2011 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA
6/22/2012 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA ND ND ND ND
1/29/2013 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA ND ND ND ND
10/29/2014 <0.079 <0.090 <0.092 <0.29 <0.090 <0.18 <0.089 <0.12 <4.7 <0.054 <0.084 <0.096 <0.14 <0.11 <0.094 <0.18 <0.10 <0.12 NA NA NA NA NA
8/9/2017 <0.12 <0.17 <0.13 <0.39 <0.090 <0.18 <0.15 <0.12 <4.9 <0.15 <0.13 <0.12 <0.22 <0.12 <0.13 <0.18 <0.13 <0.15 NA NA NA NA NA
3/19/2019
2/15/2011 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND
8/11/2011 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA ND ND ND ND
12/2/2011 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA
6/22/2012 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA
10/29/2014 <0.079 <0.090 <0.092 <0.29 <0.090 <0.18 <0.089 <0.12 <4.7 <0.054 <0.084 <0.096 <0.14 <0.11 <0.094 <0.18 <0.10 <0.12 NA NA NA NA NA
8/9/2017
3/19/2019 <0.19 <0.14 <0.13 <0.47 <0.25 <0.17 <0.19 <0.31 <3.8 <0.21 <0.19 <0.17 <0.17 <0.17 <0.13 <0.18 <0.14 <0.20 NA NA NA NA NA
12/2/2011
6/22/2012
1/19/2013
10/29/2014 <0.079 <0.090 <0.092 <0.29 <0.090 <0.18 <0.089 <0.12 <4.7 <0.054 <0.084 <0.096 <0.14 <0.11 <0.094 <0.18 <0.10 <0.12 NA NA NA NA NA
8/9/2017 <0.12 <0.17 <0.13 <0.39 <0.090 <0.18 <0.15 <0.12 <4.9 <0.15 <0.13 <0.12 <0.22 <0.12 <0.13 <0.18 <0.13 <0.15 NA NA NA NA NA
3/19/2019 <0.19 <0.14 <0.13 <0.47 <0.25 <0.17 <0.19 <0.31 <3.8 <0.21 <0.19 <0.17 <0.17 <0.17 <0.13 <0.18 <0.14 <0.20 NA NA NA NA NA
5/10/2022
Notes:
All measurements in micrograms per liter (μg/L)Bold indicates values exceeding the North Carolina 15A NCAC 02L .0202 Groundwater Standards (2L Standards)
J = Estimated value below method reporting limit
ND = Not detected at or above the laboratory detection limit VPH AND EPH concentrations calculated using the NCDEQ Table 10 Worksheet for
NA = Not Analyzed Calculating MADEP Groundwater Sample Results using unadjusted laboratory data to determine applicable standards
NS = Not Sampled -- = Constituent not reported
LNAPL = Light Non-Aqueous Phase Liquid
Page 3 of 3 1,2-DichloroethaneWSW-1
WSW-3
WSW-6
WSW-7
ND
ND
ND
ND
ND
ND
<0.19
<0.19
NOT SAMPLED - OCCUPANT ABSENT
ND
Well ID Sample
Date
<0.19
<0.41
0.4
400
<0.41
NOT SAMPLED - SITE UNOCCUPIED - NO POWER
NOT SAMPLED - SITE UNOCCUPIED - NO POWER
NOT SAMPLED - SITE UNOCCUPIED - NO POWER
<0.19
ND
NOT SAMPLED - SITE UNOCCUPIED - COULD NOT CONTACT PROPERTY OWNER
WSW-8
Table 2
Historical Water Supply Well Analytical Results
Stephens Exxon
20655 US Highway 88 West
Creston, Ashe County, North Carolina
NCDEQ Incident No. 16457
Terracon Project No. 75207132
NOT SAMPLED
NOT SAMPLED
ND
ND
Concentrations in ug/L
2L Standard
GCL Standard
ND
ND
ND
<0.19
NOT SAMPLED - OCCUPANT ABSENT
Table 3
Monitoring Well Construction Information and Water Level Measurements
Stephens Exxon
20655 US Highway 88 West
Creston, Ashe County, North Carolina
NCDEQ Incident No. 16457
Terracon Project No. 75207132
Well ID Date Installed
(m/dd/yyyy)
Well Casing
Depth (ft. BGS)
Screen Interval
(ft. BGS)
Depth of Well
(ft. BGS)
Relative Top of
Casing Elevation
Date Water
Level Measured
Depth to Water
from Top of
Casing (ft.)
LNAPL
Thickness (ft.)
Groundwater
Elevation*Comments
7/8/1997 8.49 --91.51
3/6/1998 8.01 --91.99
1/25/1999 7.87 --92.13
6/22/2012 6.62 --93.38
10/29/2014 NM --NM
8/9/2017 NM --NM
10/9/2019
7/8/1997 5.19 --95.12
3/6/1998 4.33 --95.98
1/25/1999 4.48 --95.83
4/27/2004 3.76 --96.55
2/14/2011 4.65 --95.66
10/29/2014 4.35 --95.96
8/9/2017 3.94 --96.37
3/19/2019 2.66 --97.65
10/9/2019 4.82 --95.49
5/10/2022 3.89 --96.42
10/6/2022 4.05 96.26
7/8/1997 4.03 --96.36
3/6/1998 3.58 --96.81
1/25/1999 3.62 --96.77
4/27/2004 3.01 --97.38
2/15/2011 4.3 --96.09
12/2/2011 3.76 --96.63
6/22/2012 4.2 --96.19
1/29/2013 2.98 --97.41
10/29/2014 3.99 --96.40
8/9/2017 3.38 --97.01
3/19/2019 3.44 --96.95
10/9/2019 4.32 --96.07
10/6/2022 4.09 96.30
7/8/1997 9.51 --90.96
3/6/1998 8.42 --92.05
1/25/1999 8.3 --92.17
4/27/2004 8.14 --92.33
2/15/2011 8.62 --91.85
8/11/2011 9.65 --90.82
12/2/2011 7.14 --93.33
6/22/2012 8.65 --91.82
1/29/2013 6.08 --94.39
10/29/2014 8.61 --91.86
8/9/2017 8.67 --91.80
3/19/2019 8.12 --92.35
10/9/2019 9.35 --91.12
9/26/2022 8.33 --92.14
10/6/2022 7.94 92.53
7/8/1997 12.66 --88.91
3/6/1998 12.64 --88.93
1/25/1999 11.75 --89.82
4/27/2004 12.02 --89.55
2/15/2011 NM --NM
8/11/2011 NM --NM
12/2/2011
10/29/2014 10.69 90.88 90.88
8/9/2017 NM --NM
8/9/2017 9.65 --91.44
10/9/2019 10.48 --90.61
9/26/2021 NM --NM
9/26/2022 10 --91.09
10/6/2022 9.9 91.19
7/8/1997 10.33 --88.55
3/6/1998 10.92 --87.96
1/25/1999 9.68 --89.20
9/3/2003 9.21 --89.67
2/15/2011 NM --NM
8/11/2011 NM --NM
12/2/2011
10/29/2014
8/9/2017
3/19/2019 6.18 --92.70
10/9/2019
7/8/1997 8.1 --92.94
3/6/1998 7.72 --93.32
1/25/1999 7.36 --93.68
2/15/2011 8.62 --92.42
10/9/2019
3/14/2019MW-5R
MW-2 3/7/1997 5.3 5.3 - 15.3 15.3 100.31 Type II
Type II100.39113.0-11.033/8/1997MW-3
MW-4 3/8/1997 3.9 3.9-13.9 100.4713.9
MW-1 10/23/1996 5.1 5.1 - 15.1 15.1 100.00 Type II
Not located
Not located
Type II
Type II
Type II101.091444.0-14.0
MW-5 3/8/1997 3.6 3.6-13.6 13.6 101.57
MW-6 3/13/1997 2.4 2.4-13.2 13.2 98.88
Type III
Not located
Not located
Not located
Not located
Not located
MW-7 6/4/1997 41.5 41.5-46.5 46.5 101.04
Type II
1 of 2
Table 3
Monitoring Well Construction Information and Water Level Measurements
Stephens Exxon
20655 US Highway 88 West
Creston, Ashe County, North Carolina
NCDEQ Incident No. 16457
Terracon Project No. 75207132
Well ID Date Installed
(m/dd/yyyy)
Well Casing
Depth (ft. BGS)
Screen Interval
(ft. BGS)
Depth of Well
(ft. BGS)
Relative Top of
Casing Elevation
Date Water
Level Measured
Depth to Water
from Top of
Casing (ft.)
LNAPL
Thickness (ft.)
Groundwater
Elevation*Comments
3/6/1998 2.57 --83.79
10/9/2019
3/6/1998 2.63 --81.50
1/25/1999 2.7 --81.43
2/15/2011 NM --NM
8/11/2011 NM --NM
12/2/2011 NM --NM
10/29/2014 NM --NM
8/9/2017 NM --NM
10/9/2019
1/25/1999 6.1 --95.44
10/9/2019
4/27/2004 6.27 ----
2/15/2011 11.11 1 89.43
8/8/2011 6.96 0.61 93.24
8/8/2011 9.35 0.02 90.35
8/11/2011 9.36 0.02 90.34
12/2/2011 7.94 --91.74
6/22/2012 8.94 0.21 90.92
1/29/2013 6.99 0.21 92.87
10/29/2014 8.76 0.76 91.57
8/9/2017 8.59 1.18 92.10
3/19/2019 7.89 0.39 92.12
10/9/2019 9.76 1.2 90.95
9/26/2021 NM 0.02 NM
4/19/2022 NM 0.13 NM
5/10/2022 7.49 --92.19
9/26/2022 8.17 --91.51
10/6/2022 7.95 91.73
4/27/2004 6.17 --93.35
8/11/2011 7.43 --92.09
12/2/2011 6.19 --93.33
6/22/2012 4.72 --94.80
1/29/2013 4.49 --95.03
10/29/2014 6.04 --93.48
8/9/2017 5.47 --94.05
3/19/2019 3.62 --95.90
10/9/2019 6.2 --93.32
5/10/2022 5.42 --94.10
10/6/2022 5.22 94.30
3/19/2019 4.85 --92.72
10/9/2019 6.08 --91.49
9/26/2021 6.3 --91.27
5/10/2022 5.12 --92.45
9/26/2022 5 --92.57
10/6/2022 4.6 92.97
10/9/2019 6.11 --91.28
9/26/2021 5.75 --91.64
5/10/2022 5.48 --91.91
10/6/2022 5.5 91.89
10/9/2019 7.8 --92.40
9/26/2021 7.65 --92.55
9/26/2022 7.43 --92.77
10/6/2022 7.26 92.94
10/9/2019 0.9 --86.63
9/26/2021 1.25 --86.28
10/6/2022 0.6 86.93
10/9/2019 1.16 --87.73
9/26/2021 1.66 --87.23
9/26/2022 0.4 --88.49
10/6/2022 0.5 88.39
AS-1 4/19/2022 13 13.0-16.0 16 99.54 5/10/2022 8.1 --91.44 Air Sparge Well
RW-1 4/19/2022 5 5.0-15.0 15 99.15 5/10/2022 7.61 --91.54 Recovery Well
Notes:
* = If free product is present in a well, groundwater elevation is calculated by: [Top of Casing Elevation - Depth to Water] + [free product thickness x 0.8581]
BGS = below ground surface
LNAPL = Light Non-Aqueous Phase Liquid
NM = Not Measured
Type II
Type II
Type II
Type II
15 97.39
100.2205.0-20.05.010/7/2019MW-15
87.53203.0-10.03.010/8/2019MW-16
Type II
Type II155.0-15.05.07/14/2003
97.57122.0-12.02.03/14/2019 Type II
Not LocatedMW-10 1/25/1999
MW-17 10/8/2019 3.0 3.0-13.0 13 88.89
99.68144.0-14.04.07/14/2003MW-11
Not located
Not located Type IIMW-8 3/5/1998 2.5 2.5-7.5 7.5 86.36
MW-12 99.52
MW-13
MW-14 10/7/2019 5.0 5.0-15.0
MW-9 3/5/1998 2.5 2.5-10.0 10 84.13
-- = Not Detected
Type II
Type II4.0 4.0-14.0 14 101.54
2 of 2
6010C
BenzeneTolueneEthylbenzenTotal XylenesMethyl-tert-Butyl EtherDi-Isopropyl EtherElthylene DibromideNapthaleneAcetonen-Butylbenzenesec-Butylbenzenetert-ButylbenzeneChloroform1,2-DichloroethaneIsopropylbenzene4-Isopropylbenzenen-PropylbenzeneStyrene1,2,4-Trimethylbenzene1,3,5-TrimethylbenzeneLeadC5-C8 AliphaticsC9-C18 AliphaticsC19-C36 AliphaticsC9-C22 Aromatics1 600 600 500 20 70 0.02 6 6000 70 70 70 70 0.4 70 20 70 70 400 400 15 400 700 10000 200500026000084500855002000070000506000600000069008500150007000040025000200003000070000285002500015000NENENENE7/8/1997 408 642 250 843 1773 370 NA NA NA NA NA NA NA 4.2 NA NA NA --NA NA 36 NA NA NA NA3/6/1998 653 1158 512 1436 614 565 NA 101 NA NA NA NA NA NA NA NA NA --NA NA NA NA NA NA NA1/25/1999 NA NA NA NA NA NA NA 66.9 NA NA NA NA NA NA NA NA NA --NA NA NA NA 3862 NA 9476/22/2012 ND ND ND ND ND 5.8 ND ND ND ND ND ND ND ND ND ND ND --ND ND NA NA NA NA NA10/29/20148/9/201710/9/20197/8/1997 ND ND ND ND ND ND NA NA NA NA NA NA NA ND NA NA NA --NA NA ND NA NA NA NA3/6/1998 ND ND ND ND ND ND NA ND NA NA NA NA NA NA NA NA NA --NA NA NA NA NA NA NA1/25/1999 NA NA NA NA NA NA NA ND NA NA NA NA NA NA NA NA NA --NA NA NA NA ND ND ND4/27/2004 ND ND ND ND ND ND NA ND NA NA NA NA NA NA NA NA NA --NA NA NA NA ND ND ND2/15/2011 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND --ND ND ND ND ND ND ND6/22/201210/29/2014 <0.079 <0.090 <0.092 <0.29 <0.090 <0.18 <0.089 <0.12 <4.7 <0.054 <0.084 <0.096 <0.14 <0.19 <0.11 <0.12 <0.094 <0.12 <0.18 <0.10 NA NA NA NA NA8/9/2017 <0.12 <0.17 <0.13 <0.39 <0.090 <0.18 <0.15 <0.12 <4.9 <0.15 <0.13 <0.12 <0.22 <0.19 <0.12 <0.15 <0.13 <0.15 <0.18 <0.13 NA NA NA NA NA3/19/2019 <0.18 <0.14 <0.13 <0.47 <0.25 <0.17 <0.19 <0.31 <3.8 <0.21 <0.16 <0.17 <0.17 <0.41 <0.17 <0.20 <0.13 <0.11 <0.18 <0.14 NA NA NA NA NA10/9/20197/8/1997 ND ND ND ND ND ND NA NA NA NA NA NA NA ND NA NA NA --NA NA ND NA NA NA NA3/6/1998 ND ND ND ND ND ND NA ND NA NA NA NA NA NA NA NA NA --NA NA NA NA NA NA NA1/25/1999 NA NA NA NA NA NA NA ND NA NA NA NA NA NA NA NA NA --NA NA NA NA ND ND ND4/27/2004 ND ND ND ND ND ND NA ND NA NA NA NA NA NA NA NA NA --NA NA NA NA ND ND ND2/15/2011 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND --ND ND 12 ND ND ND ND12/2/2011 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND --ND ND NA NA NA NA NA6/22/2012 ND ND ND ND ND ND ND ND ND ND 0.64 ND ND ND ND ND ND --ND ND NA NA NA NA NA1/29/2013 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND --0.27 J ND NA NA NA NA NA10/29/2014 <0.079 <0.090 <0.092 <0.29 <0.090 <0.18 <0.089 <0.12 10 J <0.054 <0.084 <0.096 <0.14 <0.19 <0.11 <0.12 <0.094 <0.12 <0.18 <0.10 NA NA NA NA NA8/9/2017 <0.12 <0.17 <0.13 <0.39 <0.090 <0.18 <0.15 <0.12 <4.9 <0.15 <0.13 <0.12 <0.22 <0.19 <0.12 <0.15 <0.13 <0.15 <0.18 <0.13 NA NA NA NA NA3/19/2019 <0.18 <0.14 <0.13 <0.47 <0.25 <0.17 <0.19 <0.31 <3.8 0.30 J 0.61 0.23 J <0.17 <0.41 0.48 J <0.20 <0.13 <0.11 0.55 <0.14 NA NA NA NA NA10/9/20197/8/1997 ND ND ND ND ND ND NA NA NA NA NA NA NA ND NA NA NA --NA NA ND NA NA NA NA3/6/1998 ND ND ND ND ND ND NA ND NA NA NA NA NA NA NA NA NA --NA NA NA NA NA NA NA1/25/1999 NA NA NA NA NA NA NA ND NA NA NA NA NA NA NA NA NA --NA NA NA NA 318 396 364/27/2004 ND ND ND ND ND ND NA ND NA NA NA NA NA NA NA NA NA --NA NA NA NA ND ND ND2/15/2011 ND ND ND ND ND ND ND 1.3 2.5 J 0.7 0.55 ND ND ND ND ND ND --3.6 0.8 NA ND 98 J ND 42 J8/11/2011 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND --ND ND NA ND ND ND ND12/2/2011 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND --ND ND NA NA NA NA NA6/22/2012 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND --0.27 J ND NA NA NA NA NA1/29/2013 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND --ND ND NA NA NA NA NA10/29/2014 <0.079 <0.090 <0.092 <0.29 <0.090 <0.18 <0.089 <0.12 <4.7 <0.054 <0.084 <0.096 <0.14 <0.19 <0.11 <0.12 <0.094 <0.12 <0.18 <0.10 NA NA NA NA NA8/9/2017 <0.12 <0.17 <0.13 <0.39 <0.090 <0.18 <0.15 <0.12 <4.9 <0.15 0.13 J <0.12 <0.22 <0.19 <0.12 <0.15 <0.13 <0.15 <0.18 <0.13 NA NA NA NA NA3/19/2019 <0.18 <0.14 <0.13 <0.47 <0.25 <0.17 <0.19 <0.31 7.5 J <0.21 <0.16 <0.17 <0.17 <0.41 <0.17 <0.20 <0.13 <0.11 <0.18 <0.14 NA NA NA NA NA10/9/20199/26/2022 <1.00 <1.00 <1.00 <2.00 <1.00 <1.00 <1.00 <5.00 <50.0 <1.00 <1.00 <1.00 <5.00 <1.00 <1.00 NA <1.00 <1.00 <1.00 <1.00 NA <100 <100 <100 <100Page 1 of 3
MW-2
MW-1 COULD NOT LOCATECOULD NOT LOCATE
MW-4
Notes on Page 3
Table 4
Summary of Groundwater Analytical Results
Stephens Exxon
20655 US Highway 88 WestCreston, Ashe County, North Carolina
NCDEQ Incident No. 16457
Terracon Project No. 75207132
Concentrations in ug/L2L StandardGCL Standard
COULD NOT LOCATE
Method 6200B MADEP EPH & VPH
NOT SAMPLED
NOT SAMPLED
Well ID Sample
Date
NOT SAMPLED
NOT SAMPLED
MW-3
6010C
BenzeneTolueneEthylbenzeneTotal XylenesMethyl-tert-Butyl EtherDi-Isopropyl EtherElthylene DibromideNapthaleneAcetonen-Butylbenzenesec-Butylbenzenetert-ButylbenzeneChloroform1,2-DichloroethaneIsopropylbenzene4-Isopropylbenzenen-PropylbenzeneStyrene1,2,4-Trimethylbenzene1,3,5-TrimethylbenzeneLeadC5-C8 AliphaticsC9-C18 AliphaticsC19-C36 AliphaticsC9-C22 Aromatics1 600 600 500 20 70 0.02 6 6000 70 70 70 70 0.4 70 20 70 70 400 400 15 400 700 10000 200500026000084500855002000070000506000600000069008500150007000040025000200003000070000285002500015000NENENENE
7/8/1997 393 1016 519 1578 96.7 23 NA NA NA NA NA NA NA ND NA NA NA --NA NA ND NA NA NA NA3/6/1998 573 5162 1112 6253 232 127 NA 168 NA NA NA NA NA NA NA NA NA --NA NA NA NA NA NA NA
1/25/1999 NA NA NA NA NA NA NA 583 NA NA NA NA NA NA NA NA NA --NA NA NA NA 39091 44 68214/27/2004 243 3580 ND 6270 2299 ND NA 97.9 NA NA NA NA NA NA NA NA NA --NA NA NA 25380 11816 ND 425802/15/20118/11/2011
12/2/201110/29/2014 42 120 240 1140 4.4 J <3.6 <1.8 110 100 J 110 18 <1.9 4.4 J <3.9 28 17 110 16 690 230 NA NA NA NA NA
8/9/20173/19/2019 <7.2 470 2000 7600 <10 <6.8 <7.6 530 <150 350 100 <6.8 <6.8 <16 300 68 1300 51 6400 2000 NA NA NA NA NA
10/08/2019 <2.5 160 682 2360 <2.5 <2.5 <2.5 195 NA <2.5 <2.5 <2.5 <25 <2.5 93 NA <2.5 13.5 1790 543 NA NA NA NA NA9/28/2021 ND 48 249 737 ND ND ND ND ND 16.9 9.4 ND ND ND 42 ND ND 3.93 630 186 NA NA NA NA NA
9/26/2022 <20.0 38.3 262 744.5 <20.0 <20.0 <20.0 <100 <1000 38 <20.0 <20.0 <100 <20.0 50.2 NA 205 <20.0 1020 272 NA NA NA NA NA
7/8/1997 ND ND ND ND ND ND NA NA NA NA NA NA NA ND NA NA NA --NA NA ND NA NA NA NA
3/6/1998 ND ND ND ND 12 ND ND ND NA NA NA NA NA NA NA NA NA --NA NA NA NA NA NA NA1/25/1999 NA NA NA NA NA NA NA ND NA NA NA NA NA NA NA NA NA --NA NA NA NA 62 ND 25
2/15/20118/11/2011
12/2/2011
10/29/20148/9/2017
3/19/2019 <0.18 <0.14 <0.13 <0.47 1 1.3 <0.19 <0.31 <3.8 <0.21 <0.16 <0.17 <0.17 <0.41 <0.17 <0.20 <0.13 <0.11 <0.18 <0.14 NA NA NA NA NA10/9/2019
7/8/1997 ND ND ND ND ND ND NA NA NA NA NA NA NA ND NA ND NA --NA NA NA NA NA NA NA1/25/1999 NA NA NA NA NA NA NA ND NA NA NA NA NA NA NA NA NA --NA NA NA NA ND ND 44
2/15/2011 ND ND ND ND ND ND ND 11 ND 4.9 4 0.61 ND ND 1.1 3 2.8 --34 7.4 ND ND 3930 ND 206010/9/2019
3/6/1998 ND ND ND ND ND ND NA ND NA NA NA NA NA NA NA NA NA --NA NA NA NA NA NA NA10/9/2019
3/6/1998 ND ND ND ND ND ND ND 2.7 NA NA NA NA NA NA NA NA NA --NA NA NA NA NA NA NA1/25/1999 NA NA NA NA NA NA NA ND NA NA NA NA NA NA NA NA NA --NA NA NA NA 45 ND 29
2/15/20118/11/2011
12/2/201110/29/2014
8/9/201710/9/2019
6/22/2014 NA NA NA NA NA NA NA 6720 NA NA NA NA NA NA NA NA NA NA NA NA NA 56680 83 255610/9/2019Page 2 of 3
MW-10 COULD NOT LOCATE
Well ID Sample
Date
MW-9
COULD NOT LOCATE
COULD NOT LOCATECOULD NOT LOCATE
COULD NOT LOCATECOULD NOT LOCATE
COULD NOT LOCATE
COULD NOT LOCATE
MW-7
COULD NOT LOCATE
MW-8
COULD NOT LOCATE
COULD NOT LOCATECOULD NOT LOCATE
COULD NOT LOCATE
COULD NOT LOCATE
Notes on Page 3
MW-6
Table 4
Summary of Groundwater Analytical Results
Stephens Exxon
20655 US Highway 88 West
Creston, Ashe County, North Carolina
NCDEQ Incident No. 16457
Terracon Project No. 75207132
Concentrations in ug/L2L Standard
GCL Standard
MW-5 COULD NOT LOCATE
COULD NOT LOCATECOULD NOT LOCATE
COULD NOT LOCATE
MW-5R
Method 6200B MADEP EPH & VPH
COULD NOT LOCATE
6010C
BenzeneTolueneEthylbenzeneTotal XylenesMethyl-tert-Butyl EtherDi-Isopropyl EtherElthylene DibromideNapthaleneAcetonen-Butylbenzenesec-Butylbenzenetert-ButylbenzeneChloroform1,2-DichloroethaneIsopropylbenzene4-Isopropylbenzenen-PropylbenzeneStyrene1,2,4-Trimethylbenzene1,3,5-TrimethylbenzeneLeadC5-C8 AliphaticsC9-C18 AliphaticsC19-C36 AliphaticsC9-C22 Aromatics1 600 600 500 20 70 0.02 6 6000 70 70 70 70 0.4 70 20 70 70 400 400 15 400 700 10000 200500026000084500855002000070000506000600000069008500150007000040025000200003000070000285002500015000NENENENE4/24/2004 ND 136 ND 318 ND ND NA 180 NA NA NA NA NA NA NA NA NA --NA NA NA NA 28000 ND 114262/15/20118/15/201112/2/2011 ND ND ND 0.93 J ND ND ND 44 ND ND 0.58 3.2 ND ND ND 4.2 ND --190 10 NA NA NA NA NA6/22/20121/29/201310/29/20148/9/20173/19/201910/9/20199/28/20214/19/20225/10/2022 <1.00 <1.00 <1.00 <2.00 <1.00 <1.00 <1.00 <5.00 <50.0 1.15 1.22 <1.00 <5.00 <1.00 <1.00 NA <1.00 <1.00 5.73 <1.00 NA NA NA NA NA
9/26/2022 <10.0 <10.0 <10.0 <20.0 <10.0 <10.0 <10.0 *3.52 <500 <10.0 <10.0 <10.0 <50.0 <10.0 <10.0 NA <10.0 <10.0 54.8 <10.0 NA <100 14380 282 33004/24/2004 ND ND ND ND ND 2.7 NA ND NA NA NA NA NA NA NA NA NA --NA NA NA NA NA NA NA02/15/11 ND ND ND ND 1.1 11 ND ND ND ND ND ND ND ND ND ND ND --ND ND 74 49 J ND ND ND08/15/11 ND ND ND ND 0.84 J 6.5 ND ND ND ND ND ND ND ND ND ND ND --ND ND NA NA ND ND ND12/02/11 ND ND ND ND ND 4.5 ND ND ND ND ND ND ND ND ND ND ND --ND ND NA NA NA NA NA06/22/12 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND --ND ND NA NA NA NA NA01/29/13 ND ND ND ND 0.30 J 3.4 ND ND ND ND ND ND ND ND ND ND ND --ND ND NA NA NA NA NA10/29/2014 <0.079 <0.090 <0.092 <0.29 0.27 J 2.2 <0.089 <0.12 37 J <0.054 <0.084 <0.096 <0.14 <0.19 <0.11 <0.12 <0.094 <0.12 <0.18 <0.10 NA NA NA NA NA8/9/2017 <0.12 <0.17 <0.13 <0.39 <0.090 1.5 <0.15 <0.12 <4.9 <0.15 <0.13 <0.12 <0.22 <0.19 <0.12 <0.15 <0.13 <0.15 <0.18 <0.13 NA NA NA NA NA3/19/2019 <0.18 <0.14 <0.13 <0.47 <0.25 6.2 <0.19 <0.31 9.0 J <0.21 <0.16 <0.17 <0.17 <0.41 <0.17 <0.20 <0.13 <0.11 <0.18 <0.14 NA NA NA NA NA10/9/20193/19/2019 <0.18 6 1.7 6.3 <0.25 <0.17 <0.19 3.7 <3.8 2.8 2.7 0.58 <0.17 <0.41 1.3 1.3 2.2 <0.11 20 1.5 NA NA NA NA NA10/08/2019 <0.25 <0.25 <0.25 <0.50 <0.25 <0.25 <2.5 2.2 NA <0.25 2.5 0.55 <2.5 <2.5 0.84 NA 0.87 <0.25 10.9 <0.25 NA NA NA NA NA9/28/2021 ND ND ND ND ND ND ND ND ND 2 3 ND ND ND 1 ND ND ND 14 ND NA NA NA NA NA5/10/2022 <1.00 <1.00 <1.00 <2.00 <1.00 <1.00 <1.00 <5.00 <50.0 1.98 2.65 <1.00 <5.00 <1.00 1.09 NA 1.07 <1.00 11.8 <1.00 NA NA NA NA NA9/26/2022 <5.00 <5.00 <5.00 <10.0 <5.00 <5.00 <5.00 <25.0 <250 <5.00 <5.00 <5.00 <25.0 <5.00 <5.00 NA <5.00 <5.00 11.5 <5.00 NA <100 151 <100 142
10/08/2019 <0.25 <0.25 <0.25 <0.50 <0.25 <0.25 <0.25 <1.0 NA <0.25 0.56 <0.25 <2.5 <0.25 <0.25 NA <0.25 <0.25 1 <0.25 NA NA NA NA NA9/28/2021 ND 48 309 845 ND ND ND ND ND 18 11 ND ND ND 41 ND 158 ND 797 214 NA NA NA NA NA5/10/2022 <1.00 <1.00 <1.00 <2.00 <1.00 <1.00 <1.00 <5.00 <50.0 <1.00 <1.00 <1.00 <5.00 <1.00 <1.00 NA <1.00 <1.00 <1.00 <1.00 NA NA NA NA NA10/08/2019 0.66 3.1 22.3 64 <0.25 <0.25 <0.25 6.1 NA 1.7 <0.25 <0.25 <2.5 <0.25 1.9 NA <0.25 <0.25 38.7 11.4 NA NA NA NA NA9/28/2021 ND 121 788 1255 ND ND ND ND ND ND ND ND ND ND ND ND 101 ND 584 167 NA NA NA NA NA
9/26/2022 <10.0 18.8 140 268 <10.0 <10.0 <10.0 <50.0 <500 <10.0 <10.0 <10.0 <50.0 <10.0 <10.0 NA 22.6 <10.0 134 34.4 NA NA NA NA NA10/09/2019 0.27J 0.41J 1.8 4.5 <0.25 <0.25 <0.25 <1.0 NA 0.71 <0.25 <0.25 <2.5 <0.25 0.44J NA 1.8 <0.25 8.9 2.6 NA NA NA NA NA9/28/2021 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND NA NA NA NA NA10/09/2019 3.5 14.1 210 487 <1.0 <1.0 <1.0 55.7 NA <1.0 <1.0 <1.0 <10.0 <1.0 17.2 NA 59.2 <1.0 353 74.3 NA NA NA NA NA9/28/2021 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 2 ND NA NA NA NA NA9/26/2022 5.03 2.24 40.3 72.66 <1.00 1.14 <1.00 9.77 <50.0 <1.00 <1.00 <1.00 <5.00 <1.00 2.89 NA 8.36 <1.00 53.8 5.7 NA NA NA NA NATW-1 7/8/1997 35.6 3.8 27.2 2.8 4 39.3 NA NA NA NA NA NA NA NA NA NA NA --NA NA NA NA NA NA NATW-2 7/8/1997 ND ND ND ND ND ND NA NA NA NA NA NA NA NA NA NA NA --NA NA NA NA NA NA NASW-1 10/29/2014 <0.079 <0.090 <0.092 <0.29 <0.090 <0.18 <0.089 <0.12 <4.7 <0.054 <0.084 <0.096 <0.14 <0.19 <0.11 <0.12 <0.094 <0.12 <0.18 <0.10 NA NA NA NA NANotes:*indicates concentration determined by EPA Method 625.1All measurements in micrograms per liter (μg/L)Bold indicates values exceeding the North Carolina 15A NCAC 02L .0202 Groundwater Standards (2L Standards)J = Estimated value below method reporting limit
ND = Not detected at or above the laboratory detection limit VPH AND EPH concentrations calculated using the NCDEQ Table 10Worksheet for
NA = Not Analyzed Calculating MADEP Groundwater Sample Results using unadjusted laboratory data to determine applicable standardsNS = Not Sampled -- = Constituent not reportedLNAPL = Light Non-Aqueous Phase LiquidPage 3 of 3
NOT SAMPLED - LNAPL (0.13 ft)
GCL Standard
MW-12
MW-14
NOT SAMPLED
NOT SAMPLED - LNAPL (1.20 ft)NOT SAMPLED - LNAPL (0.02 ft)
MW-11
MW-13
Table 4
Summary of Groundwater Analytical Results
Stephens Exxon
20655 US Highway 88 West
Creston, Ashe County, North Carolina
NCDEQ Incident No. 16457
Terracon Project No. 75207132
NOT SAMPLED - LNAPL (1.18 ft)NOT SAMPLED - LNAPL (0.39 ft)
NOT SAMPLEDNOT SAMPLED
NOT SAMPLED - LNAPL (0.21 ft)NOT SAMPLED - LNAPL (0.21 ft)NOT SAMPLED - LNAPL (0.76 ft)
Concentrations in ug/L2L Standard
Method 6200B MADEP EPH & VPH
MW-16
Well ID Sample
Date
MW-15
MW-17

APPENDIX A
FIELD NOTES
7.43 ft-TOC 2 inch
20.00 ft-TOC 2.1 Gal
12.57 feet 6.15 Gal
feet Stickup:0.4 ft-GRD 10.26 Gal
Start Time:13:40 End Time:
On (sec):Off (sec):Pressure:psi
ft-TOC
feet 200 mL
ft-TOC
Gallons
mL/min
(Yes/No)
Field Parameters (Taken at time intervals ≥ 5 minutes and purge volumes ≥ 1 flow-through cell volume)
Time
Volume
Purged Flow Rate
Depth to
Water Temp pH Spec. Cond.
Dissolved
Oxygen ORP*Turbidity
(gal)(mL/min)(ft)(°C)(s.u.)(µS/cm)(mg/L)(mV)(NTU)
13:40 0.0 ------------------------
13:45 16.8 6.5 489 -102
13:55 17.1 6.8 508 -117
14:05 16.9 6.7 537 -112
Final:14:05 16.9 6.7 537 -112
Sample Method:14:05 14:05
Qty Container Qty Container
Name Signature Date
(1)
Notes:
Revision 09SEP2021
To convert ORP to Eh, add 205 mV to ORP.
VOCs 6200 HCl
Method Preservative Method Preservative
Bailer Sample Start Time:Sample End Time:
Analytical Data
End of Purging
Comment
Start Purging
Final Volume Purged:Used YSI Pro Plus, Disposable bailer
Final Volume Purge Rate:
Well Purged Dry?:
DTW-TOC at 25% Drawdown of WC Above Pump:Comments:
(If Used)Bladder Pump Control Settings:
Purge Method:14:05
Pump Intake Depth from Top of Casing:
Water Column Above Pump Intake:Flow Through Cell Vol:
Well Purging Information
Depth to Water:Well Diameter
Measuring Point:Top of Casing Well Volume
Total Well Depth:Water Volume
Height of Water Column:3 * Well Volume
Screen Length:5 * Well Volume
Weather:Sunny Air Temp:° F
Water Level & Well Data
Locked?:No Sample Date:September 26, 2022
Sampled By:Chad Hollandsworth Sample Time:14:05
Project Number:75207132 Purge Date:September 26, 2022
Source Well:MW-15 Purge Time: Minutes
LOW FLOW GROUNDWATER SAMPLING FORM
Project Name:Stephens Exxon
Project Location:Creston, NC
10.00 ft-TOC 2 inch
14.00 ft-TOC 0.7 Gal
4.00 feet 1.96 Gal
feet Stickup:0.4 ft-GRD 3.26 Gal
Start Time:14:05 End Time:
On (sec):Off (sec):Pressure:psi
ft-TOC
feet 200 mL
ft-TOC
Gallons
mL/min
(Yes/No)
Field Parameters (Taken at time intervals ≥ 5 minutes and purge volumes ≥ 1 flow-through cell volume)
Time
Volume
Purged Flow Rate
Depth to
Water Temp pH Spec. Cond.
Dissolved
Oxygen ORP*Turbidity
(gal)(mL/min)(ft)(°C)(s.u.)(µS/cm)(mg/L)(mV)(NTU)
14:05 0.0 ------------------------
14:10 16.5 6.8 281 -101
14:20 16.7 6.7 308 -116
14:30 16.8 6.7 292 -111
Final:14:30 16.8 6.7 292 -111
Sample Method:14:30 14:30
Qty Container Qty Container
Name Signature Date
(1)
Notes:
Revision 09SEP2021
Project Number:75207132 Purge Date:September 26, 2022
Source Well:MW-5R Purge Time: Minutes
LOW FLOW GROUNDWATER SAMPLING FORM
Project Name:Stephens Exxon
Project Location:Creston, NC
Weather:Sunny Air Temp:° F
Water Level & Well Data
Locked?:No Sample Date:September 26, 2022
Sampled By:Chad Hollandsworth Sample Time:14:30
Measuring Point:Top of Casing Well Volume
Total Well Depth:Water Volume
Height of Water Column:3 * Well Volume
Screen Length:5 * Well Volume
Well Purging Information
Depth to Water:Well Diameter
(If Used)Bladder Pump Control Settings:
Purge Method:14:30
Pump Intake Depth from Top of Casing:
Water Column Above Pump Intake:Flow Through Cell Vol:
Final Volume Purged:Used YSI Pro Plus, Disposable bailer
Final Volume Purge Rate:
Well Purged Dry?:
DTW-TOC at 25% Drawdown of WC Above Pump:Comments:
Comment
Start Purging
End of Purging
Bailer Sample Start Time:Sample End Time:
Analytical Data
Method Preservative Method Preservative
VOCs 6200 HCl
To convert ORP to Eh, add 205 mV to ORP.
0.40 ft-TOC 2 inch
13.00 ft-TOC 2.1 Gal
12.60 feet 6.17 Gal
feet Stickup:0.4 ft-GRD 10.28 Gal
Start Time:14:30 End Time:
On (sec):Off (sec):Pressure:psi
ft-TOC
feet 200 mL
ft-TOC
Gallons
mL/min
(Yes/No)
Field Parameters (Taken at time intervals ≥ 5 minutes and purge volumes ≥ 1 flow-through cell volume)
Time
Volume
Purged Flow Rate
Depth to
Water Temp pH Spec. Cond.
Dissolved
Oxygen ORP*Turbidity
(gal)(mL/min)(ft)(°C)(s.u.)(µS/cm)(mg/L)(mV)(NTU)
14:30 0.0 ------------------------
14:35 21.7 6.7 382 -61
14:40 21.6 6.1 361 -60
14:45 22.6 5.9 200 -55
Final:14:45 22.6 5.9 200 -55
Sample Method:14:45 14:45
Qty Container Qty Container
Name Signature Date
(1)
Notes:
Revision 09SEP2021
Project Number:75207132 Purge Date:September 26, 2022
Source Well:MW-17 Purge Time: Minutes
LOW FLOW GROUNDWATER SAMPLING FORM
Project Name:Stephens Exxon
Project Location:Creston, NC
Weather:Sunny Air Temp:° F
Water Level & Well Data
Locked?:No Sample Date:September 26, 2022
Sampled By:Chad Hollandsworth Sample Time:14:45
Measuring Point:Top of Casing Well Volume
Total Well Depth:Water Volume
Height of Water Column:3 * Well Volume
Screen Length:5 * Well Volume
Well Purging Information
Depth to Water:Well Diameter
(If Used)Bladder Pump Control Settings:
Purge Method:14:45
Pump Intake Depth from Top of Casing:
Water Column Above Pump Intake:Flow Through Cell Vol:
Final Volume Purged:Used YSI Pro Plus, Disposable bailer
Final Volume Purge Rate:
Well Purged Dry?:
DTW-TOC at 25% Drawdown of WC Above Pump:Comments:
Comment
Start Purging
End of Purging
Bailer Sample Start Time:Sample End Time:
Analytical Data
Method Preservative Method Preservative
VOCs 6200 HCl
To convert ORP to Eh, add 205 mV to ORP.
5.00 ft-TOC 2 inch
12.00 ft-TOC 1.1 Gal
7.00 feet 3.43 Gal
feet Stickup:0.4 ft-GRD 5.71 Gal
Start Time:15:35 End Time:
On (sec):Off (sec):Pressure:psi
ft-TOC
feet 200 mL
ft-TOC
Gallons
mL/min
(Yes/No)
Field Parameters (Taken at time intervals ≥ 5 minutes and purge volumes ≥ 1 flow-through cell volume)
Time
Volume
Purged Flow Rate
Depth to
Water Temp pH Spec. Cond.
Dissolved
Oxygen ORP*Turbidity
(gal)(mL/min)(ft)(°C)(s.u.)(µS/cm)(mg/L)(mV)(NTU)
15:35 0.0 ------------------------
15:40 18.0 6.2 693 -81
15:50 18.1 6.3 681 -88
16:00 18.5 6.2 689 -50
Final:16:00 18.5 6.2 689 -50
Sample Method:16:00 16:00
Qty Container Qty Container
Name Signature Date
(1)
Notes:
Revision 09SEP2021
Project Number:75207132 Purge Date:September 26, 2022
Source Well:MW-13 Purge Time: Minutes
LOW FLOW GROUNDWATER SAMPLING FORM
Project Name:Stephens Exxon
Project Location:Creston, NC
Weather:Sunny Air Temp:° F
Water Level & Well Data
Locked?:No Sample Date:September 26, 2022
Sampled By:Chris Driscoll Sample Time:16:00
Measuring Point:Top of Casing Well Volume
Total Well Depth:Water Volume
Height of Water Column:3 * Well Volume
Screen Length:5 * Well Volume
Well Purging Information
Depth to Water:Well Diameter
(If Used)Bladder Pump Control Settings:
Purge Method:16:00
Pump Intake Depth from Top of Casing:
Water Column Above Pump Intake:Flow Through Cell Vol:
Final Volume Purged:Used YSI Pro Plus
Final Volume Purge Rate:
Well Purged Dry?:
DTW-TOC at 25% Drawdown of WC Above Pump:Comments:
Comment
Start Purging
End of Purging
Bailer Sample Start Time:Sample End Time:
Analytical Data
Method Preservative Method Preservative
VPH MADEP
VOCs 6200 HCl
EPH MADEP
To convert ORP to Eh, add 205 mV to ORP.
SVOCs 625
8.17 ft-TOC 2 inch
14.00 ft-TOC 1.0 Gal
5.83 feet 2.85 Gal
feet Stickup:0.4 ft-GRD 4.76 Gal
Start Time:14:48 End Time:
On (sec):Off (sec):Pressure:psi
ft-TOC
feet 200 mL
ft-TOC
Gallons
mL/min
(Yes/No)
Field Parameters (Taken at time intervals ≥ 5 minutes and purge volumes ≥ 1 flow-through cell volume)
Time
Volume
Purged Flow Rate
Depth to
Water Temp pH Spec. Cond.
Dissolved
Oxygen ORP*Turbidity
(gal)(mL/min)(ft)(°C)(s.u.)(µS/cm)(mg/L)(mV)(NTU)
14:48 0.0 ------------------------
14:50 16.6 6.1 577 -81
14:55 16.5 5.9 362 -71
15:00 16.8 5.8 348 -71
Final:15:00 16.8 5.8 348 -71
Sample Method:15:00 15:00
Qty Container Qty Container
Name Signature Date
(1)
Notes:
Revision 09SEP2021
Project Number:75207132 Purge Date:September 26, 2022
Source Well:MW-11 Purge Time: Minutes
LOW FLOW GROUNDWATER SAMPLING FORM
Project Name:Stephens Exxon
Project Location:Creston, NC
Weather:Sunny Air Temp:° F
Water Level & Well Data
Locked?:No Sample Date:September 26, 2022
Sampled By:Chris Driscoll Sample Time:15:00
Measuring Point:Top of Casing Well Volume
Total Well Depth:Water Volume
Height of Water Column:3 * Well Volume
Screen Length:5 * Well Volume
Well Purging Information
Depth to Water:Well Diameter
(If Used)Bladder Pump Control Settings:
Purge Method:15:00
Pump Intake Depth from Top of Casing:
Water Column Above Pump Intake:Flow Through Cell Vol:
Final Volume Purged:Used YSI Pro Plus
Final Volume Purge Rate:
Well Purged Dry?:
DTW-TOC at 25% Drawdown of WC Above Pump:Comments:
Comment
Start Purging
End of Purging
Bailer Sample Start Time:Sample End Time:
Analytical Data
Method Preservative Method Preservative
VPH MADEP
VOCs 6200 HCl
EPH MADEP
To convert ORP to Eh, add 205 mV to ORP.
SVOCs 625
8.33 ft-TOC 2 inch
13.90 ft-TOC 0.9 Gal
5.57 feet 2.73 Gal
feet Stickup:0.4 ft-GRD 4.54 Gal
Start Time:16:10 End Time:
On (sec):Off (sec):Pressure:psi
ft-TOC
feet 200 mL
ft-TOC
Gallons
mL/min
(Yes/No)
Field Parameters (Taken at time intervals ≥ 5 minutes and purge volumes ≥ 1 flow-through cell volume)
Time
Volume
Purged Flow Rate
Depth to
Water Temp pH Spec. Cond.
Dissolved
Oxygen ORP*Turbidity
(gal)(mL/min)(ft)(°C)(s.u.)(µS/cm)(mg/L)(mV)(NTU)
16:10 0.0 ------------------------
16:15 16.7 5.6 349 -111
16:25 16.6 5.5 309 -90
16:35 16.1 6.2 292 -99
Final:16:35 16.1 6.2 292 -99
Sample Method:16:35 16:35
Qty Container Qty Container
Name Signature Date
(1)
Notes:
Revision 09SEP2021
Project Number:75207132 Purge Date:September 26, 2022
Source Well:MW-4 Purge Time: Minutes
LOW FLOW GROUNDWATER SAMPLING FORM
Project Name:Stephens Exxon
Project Location:Creston, NC
Weather:Sunny Air Temp:° F
Water Level & Well Data
Locked?:No Sample Date:September 26, 2022
Sampled By:Chad Hollandsworth Sample Time:16:35
Measuring Point:Top of Casing Well Volume
Total Well Depth:Water Volume
Height of Water Column:3 * Well Volume
Screen Length:5 * Well Volume
Well Purging Information
Depth to Water:Well Diameter
(If Used)Bladder Pump Control Settings:
Purge Method:16:35
Pump Intake Depth from Top of Casing:
Water Column Above Pump Intake:Flow Through Cell Vol:
Final Volume Purged:Used YSI Pro Plus
Final Volume Purge Rate:
Well Purged Dry?:
DTW-TOC at 25% Drawdown of WC Above Pump:Comments:
Comment
Start Purging
End of Purging
Bailer Sample Start Time:Sample End Time:
Analytical Data
Method Preservative Method Preservative
VPH MADEP
VOCs 6200 HCl
EPH MADEP
To convert ORP to Eh, add 205 mV to ORP.
SVOCs 625

APPENDIX B
LABORATORY ANALYTICAL
RESULTS AND CHAIN OF CUSTODY
FORM
ANALYTICAL REPORT
October 13, 2022
Terracon - Greensboro, NC
Sample Delivery Group:L1540642
Samples Received:09/28/2022
Project Number:75207132
Description:Stephens Exxon
Report To:Chris Driscoll
7327-G, West Friendly Ave
Greensboro, NC 27410
Entire Report Reviewed By:
October 13, 2022
[Preliminary Report]
Heather J Wagner
Project Manager
Results relate only to the items tested or calibrated and are reported as rounded values. This test report shall not be reproduced, except in full, without written approval of the laboratory. Where applicable, sampling conducted by Pace Analytical National is performed per guidance provided in laboratory standard operating procedures ENV-SOP-MTJL-0067 and ENV-SOP-MTJL-0068. Where sampling conducted by the customer, results relate to the accuracy of the information provided, and as the samples are received.
Pace Analytical National
12065 Lebanon Rd Mount Juliet, TN 37122 615-758-5858 800-767-5859 www.pacenational.com
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 09:32 1 of 47
October 13, 2022
Heather J Wagner
Project Manager
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 10:04 1 of 47
TABLE OF CONTENTS
Cp: Cover Page 1
Tc: Table of Contents 2
Ss: Sample Summary 3
Cn: Case Narrative 5
Sr: Sample Results 6
MW-5R L1540642-01 6
MW-15 L1540642-02 8
MW-17 L1540642-03 10
MW-13 L1540642-04 12
MW-4 L1540642-05 16
MW-11 L1540642-06 20
FB-1 L1540642-07 24
Qc: Quality Control Summary 28
Volatile Petroleum Hydrocarbons by Method MADEPV 28
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 30
TPH by Method MADEPE 38
Semi Volatile Organic Compounds (GC/MS) by Method 625.1 39
Gl: Glossary of Terms 44
Al: Accreditations & Locations 46
Sc: Sample Chain of Custody 47
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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SAMPLE SUMMARY
Collected by Collected date/time Received date/time
MW-5R L1540642-01 GW Chris Driscoll 09/26/22 14:30 09/28/22 09:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG1938382 20 10/06/22 18:50 10/06/22 18:50 JAH Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG1940230 20 10/11/22 07:59 10/11/22 07:59 ADM Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-15 L1540642-02 GW Chris Driscoll 09/26/22 14:05 09/28/22 09:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG1940230 10 10/11/22 08:21 10/11/22 08:21 ADM Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-17 L1540642-03 GW Chris Driscoll 09/26/22 14:45 09/28/22 09:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG1938382 1 10/06/22 14:06 10/06/22 14:06 JAH Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG1940230 1 10/11/22 04:13 10/11/22 04:13 ADM Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-13 L1540642-04 GW Chris Driscoll 09/26/22 16:00 09/28/22 09:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Petroleum Hydrocarbons by Method MADEPV WG1936695 1 10/04/22 17:03 10/04/22 17:03 AV Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG1938382 5 10/06/22 18:10 10/06/22 18:10 GLN Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG1940230 5 10/11/22 08:44 10/11/22 08:44 ADM Mt. Juliet, TN
TPH by Method MADEPE WG1937846 1 10/01/22 13:34 10/06/22 17:39 JDG Mt. Juliet, TN
TPH by Method MADEPE WG1937846 1 10/01/22 13:34 10/06/22 23:51 JDG Mt. Juliet, TN
Semi Volatile Organic Compounds (GC/MS) by Method 625.1 WG1935556 1 10/03/22 06:34 10/03/22 17:20 DSH Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-4 L1540642-05 GW Chris Driscoll 09/26/22 16:35 09/28/22 09:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Petroleum Hydrocarbons by Method MADEPV WG1936695 1 10/04/22 17:36 10/04/22 17:36 AV Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG1938382 1 10/06/22 14:26 10/06/22 14:26 JAH Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG1940230 1 10/11/22 04:36 10/11/22 04:36 ADM Mt. Juliet, TN
TPH by Method MADEPE WG1937846 1 10/01/22 13:34 10/06/22 18:03 JDG Mt. Juliet, TN
TPH by Method MADEPE WG1937846 1 10/01/22 13:34 10/06/22 23:25 JDG Mt. Juliet, TN
Semi Volatile Organic Compounds (GC/MS) by Method 625.1 WG1935556 1 10/03/22 06:34 10/03/22 17:41 DSH Mt. Juliet, TN
Collected by Collected date/time Received date/time
MW-11 L1540642-06 GW Chris Driscoll 09/26/22 15:00 09/28/22 09:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Petroleum Hydrocarbons by Method MADEPV WG1936695 1 10/04/22 18:09 10/04/22 18:09 AV Mt. Juliet, TN
Volatile Petroleum Hydrocarbons by Method MADEPV WG1937847 10 10/06/22 06:39 10/06/22 06:39 MGF Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG1938382 10 10/06/22 18:30 10/06/22 18:30 JAH Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG1940230 10 10/11/22 09:07 10/11/22 09:07 ADM Mt. Juliet, TN
TPH by Method MADEPE WG1937846 1 10/01/22 13:34 10/06/22 18:28 JDG Mt. Juliet, TN
TPH by Method MADEPE WG1937846 1 10/01/22 13:34 10/06/22 22:59 JDG Mt. Juliet, TN
TPH by Method MADEPE WG1937846 5 10/01/22 13:34 10/07/22 15:15 JDG Mt. Juliet, TN
Semi Volatile Organic Compounds (GC/MS) by Method 625.1 WG1935556 1 10/03/22 06:34 10/03/22 18:02 DSH Mt. Juliet, TN
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 09:32 3 of 47
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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SAMPLE SUMMARY
Collected by Collected date/time Received date/time
FB-1 L1540642-07 GW Chris Driscoll 09/26/22 16:30 09/28/22 09:00
Method Batch Dilution Preparation Analysis Analyst Location
date/time date/time
Volatile Petroleum Hydrocarbons by Method MADEPV WG1936695 1 10/04/22 18:42 10/04/22 18:42 AV Mt. Juliet, TN
Volatile Petroleum Hydrocarbons by Method MADEPV WG1937847 1 10/06/22 05:00 10/06/22 05:00 MGF Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG1938382 1 10/06/22 14:46 10/06/22 14:46 JAH Mt. Juliet, TN
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 WG1940230 1 10/11/22 04:58 10/11/22 04:58 ADM Mt. Juliet, TN
TPH by Method MADEPE WG1937846 1 10/01/22 13:34 10/06/22 18:55 JDG Mt. Juliet, TN
TPH by Method MADEPE WG1937846 1 10/01/22 13:34 10/06/22 22:36 JDG Mt. Juliet, TN
Semi Volatile Organic Compounds (GC/MS) by Method 625.1 WG1935556 1 10/03/22 06:34 10/03/22 18:23 DSH Mt. Juliet, TN
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 10:04 4 of 47
CASE NARRATIVE
All sample aliquots were received at the correct temperature, in the proper containers, with the
appropriate preservatives, and within method specified holding times, unless qualified or notated within
the report. Where applicable, all MDL (LOD) and RDL (LOQ) values reported for environmental samples
have been corrected for the dilution factor used in the analysis. All Method and Batch Quality Control
are within established criteria except where addressed in this case narrative, a non-conformance form
or properly qualified within the sample results. By my digital signature below, I affirm to the best of my
knowledge, all problems/anomalies observed by the laboratory as having the potential to affect the
quality of the data have been identified by the laboratory, and no information or data have been
knowingly withheld that would affect the quality of the data.
[Preliminary Report]
Heather J Wagner
Project Manager
Sample Delivery Group (SDG) Narrative
An aliquot for analysis was taken from the original container received due to the level of sediment present in the sample.
Rinsing of the original sample container for inclusion in the sample extraction was not performed.
Lab Sample ID Project Sample ID Method
L1540642-04 MW-13 MADEPE
L1540642-05 MW-4 MADEPE
L1540642-06 MW-11 MADEPE
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 09:32 5 of 47
Heather J Wagner
Project Manager
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 10:04 5 of 47
SAMPLE RESULTS - 01
L1540642
MW-5R
Collected date/time: 09/26/22 14:30
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Acetone ND J4 1000 20 10/06/2022 18:50 WG1938382
Acrolein ND 1000 20 10/06/2022 18:50 WG1938382
Acrylonitrile ND 200 20 10/06/2022 18:50 WG1938382
Benzene ND 20.0 20 10/06/2022 18:50 WG1938382
Bromobenzene ND 20.0 20 10/06/2022 18:50 WG1938382
Bromodichloromethane ND 20.0 20 10/06/2022 18:50 WG1938382
Bromoform ND 20.0 20 10/06/2022 18:50 WG1938382
Bromomethane ND 100 20 10/06/2022 18:50 WG1938382
n-Butylbenzene 38.0 20.0 20 10/06/2022 18:50 WG1938382
sec-Butylbenzene ND 20.0 20 10/06/2022 18:50 WG1938382
tert-Butylbenzene ND 20.0 20 10/06/2022 18:50 WG1938382
Carbon tetrachloride ND 20.0 20 10/06/2022 18:50 WG1938382
Chlorobenzene ND 20.0 20 10/06/2022 18:50 WG1938382
Chlorodibromomethane ND 20.0 20 10/06/2022 18:50 WG1938382
Chloroethane ND 100 20 10/06/2022 18:50 WG1938382
Chloroform ND 100 20 10/06/2022 18:50 WG1938382
Chloromethane ND 50.0 20 10/06/2022 18:50 WG1938382
2-Chlorotoluene ND 20.0 20 10/06/2022 18:50 WG1938382
4-Chlorotoluene ND 20.0 20 10/06/2022 18:50 WG1938382
1,2-Dibromo-3-Chloropropane ND 100 20 10/06/2022 18:50 WG1938382
1,2-Dibromoethane ND 20.0 20 10/06/2022 18:50 WG1938382
Dibromomethane ND 20.0 20 10/06/2022 18:50 WG1938382
1,2-Dichlorobenzene ND 20.0 20 10/06/2022 18:50 WG1938382
1,3-Dichlorobenzene ND 20.0 20 10/06/2022 18:50 WG1938382
1,4-Dichlorobenzene ND 20.0 20 10/06/2022 18:50 WG1938382
Dichlorodifluoromethane ND 100 20 10/06/2022 18:50 WG1938382
1,1-Dichloroethane ND 20.0 20 10/06/2022 18:50 WG1938382
1,2-Dichloroethane ND 20.0 20 10/06/2022 18:50 WG1938382
1,1-Dichloroethene ND 20.0 20 10/06/2022 18:50 WG1938382
cis-1,2-Dichloroethene ND 20.0 20 10/06/2022 18:50 WG1938382
trans-1,2-Dichloroethene ND 20.0 20 10/06/2022 18:50 WG1938382
1,2-Dichloropropane ND 20.0 20 10/06/2022 18:50 WG1938382
1,1-Dichloropropene ND 20.0 20 10/06/2022 18:50 WG1938382
1,3-Dichloropropane ND 20.0 20 10/06/2022 18:50 WG1938382
2,2-Dichloropropane ND 20.0 20 10/06/2022 18:50 WG1938382
Di-isopropyl ether ND 20.0 20 10/06/2022 18:50 WG1938382
Ethylbenzene 262 20.0 20 10/06/2022 18:50 WG1938382
Hexachloro-1,3-butadiene ND 20.0 20 10/06/2022 18:50 WG1938382
Isopropylbenzene 50.2 20.0 20 10/06/2022 18:50 WG1938382
p-Isopropyltoluene ND 20.0 20 10/06/2022 18:50 WG1938382
2-Butanone (MEK)ND 200 20 10/06/2022 18:50 WG1938382
Methylene Chloride ND 100 20 10/06/2022 18:50 WG1938382
4-Methyl-2-pentanone (MIBK)ND 200 20 10/06/2022 18:50 WG1938382
Methyl tert-butyl ether ND 20.0 20 10/06/2022 18:50 WG1938382
Naphthalene ND 100 20 10/06/2022 18:50 WG1938382
n-Propylbenzene 205 20.0 20 10/06/2022 18:50 WG1938382
Styrene ND 20.0 20 10/06/2022 18:50 WG1938382
1,1,1,2-Tetrachloroethane ND 20.0 20 10/06/2022 18:50 WG1938382
1,1,2,2-Tetrachloroethane ND 20.0 20 10/06/2022 18:50 WG1938382
Tetrachloroethene ND 20.0 20 10/06/2022 18:50 WG1938382
Toluene 38.3 20.0 20 10/06/2022 18:50 WG1938382
1,2,3-Trichlorobenzene ND Q 20.0 20 10/11/2022 07:59 WG1940230
1,2,4-Trichlorobenzene ND 20.0 20 10/06/2022 18:50 WG1938382
1,1,1-Trichloroethane ND 20.0 20 10/06/2022 18:50 WG1938382
1,1,2-Trichloroethane ND 20.0 20 10/06/2022 18:50 WG1938382
Trichloroethene ND 20.0 20 10/06/2022 18:50 WG1938382
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 09:32 6 of 47
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 10:04 6 of 47
SAMPLE RESULTS - 01
L1540642
MW-5R
Collected date/time: 09/26/22 14:30
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Trichlorofluoromethane ND 100 20 10/06/2022 18:50 WG1938382
1,2,3-Trichloropropane ND 50.0 20 10/06/2022 18:50 WG1938382
1,2,4-Trimethylbenzene 1020 20.0 20 10/06/2022 18:50 WG1938382
1,3,5-Trimethylbenzene 272 20.0 20 10/06/2022 18:50 WG1938382
Vinyl chloride ND 20.0 20 10/06/2022 18:50 WG1938382
o-Xylene 92.5 20.0 20 10/06/2022 18:50 WG1938382
m&p-Xylenes 652 40.0 20 10/06/2022 18:50 WG1938382
(S) Toluene-d8 108 80.0-120 10/06/2022 18:50 WG1938382
(S) Toluene-d8 105 80.0-120 10/11/2022 07:59 WG1940230
(S) 4-Bromofluorobenzene 97.0 77.0-126 10/06/2022 18:50 WG1938382
(S) 4-Bromofluorobenzene 103 77.0-126 10/11/2022 07:59 WG1940230
(S) 1,2-Dichloroethane-d4 120 70.0-130 10/06/2022 18:50 WG1938382
(S) 1,2-Dichloroethane-d4 89.6 70.0-130 10/11/2022 07:59 WG1940230
Sample Narrative:
L1540642-01 WG1938382, WG1940230: Non-target compounds too high to run at a lower dilution.
L1540642-01 WG1938382, WG1940230: 1,2,3-TCB re-analyzed out of hold due to failing QC in initial in hold run
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 09:32 7 of 47
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 10:04 7 of 47
SAMPLE RESULTS - 02
L1540642
MW-15
Collected date/time: 09/26/22 14:05
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Acetone ND Q 500 10 10/11/2022 08:21 WG1940230
Acrolein ND C4 Q 500 10 10/11/2022 08:21 WG1940230
Acrylonitrile ND Q 100 10 10/11/2022 08:21 WG1940230
Benzene ND Q 10.0 10 10/11/2022 08:21 WG1940230
Bromobenzene ND Q 10.0 10 10/11/2022 08:21 WG1940230
Bromodichloromethane ND Q 10.0 10 10/11/2022 08:21 WG1940230
Bromoform ND Q 10.0 10 10/11/2022 08:21 WG1940230
Bromomethane ND Q 50.0 10 10/11/2022 08:21 WG1940230
n-Butylbenzene ND Q 10.0 10 10/11/2022 08:21 WG1940230
sec-Butylbenzene ND Q 10.0 10 10/11/2022 08:21 WG1940230
tert-Butylbenzene ND Q 10.0 10 10/11/2022 08:21 WG1940230
Carbon tetrachloride ND Q 10.0 10 10/11/2022 08:21 WG1940230
Chlorobenzene ND Q 10.0 10 10/11/2022 08:21 WG1940230
Chlorodibromomethane ND Q 10.0 10 10/11/2022 08:21 WG1940230
Chloroethane ND Q 50.0 10 10/11/2022 08:21 WG1940230
Chloroform ND Q 50.0 10 10/11/2022 08:21 WG1940230
Chloromethane ND Q 25.0 10 10/11/2022 08:21 WG1940230
2-Chlorotoluene ND Q 10.0 10 10/11/2022 08:21 WG1940230
4-Chlorotoluene ND Q 10.0 10 10/11/2022 08:21 WG1940230
1,2-Dibromo-3-Chloropropane ND Q 50.0 10 10/11/2022 08:21 WG1940230
1,2-Dibromoethane ND Q 10.0 10 10/11/2022 08:21 WG1940230
Dibromomethane ND Q 10.0 10 10/11/2022 08:21 WG1940230
1,2-Dichlorobenzene ND Q 10.0 10 10/11/2022 08:21 WG1940230
1,3-Dichlorobenzene ND Q 10.0 10 10/11/2022 08:21 WG1940230
1,4-Dichlorobenzene ND Q 10.0 10 10/11/2022 08:21 WG1940230
Dichlorodifluoromethane ND Q 50.0 10 10/11/2022 08:21 WG1940230
1,1-Dichloroethane ND Q 10.0 10 10/11/2022 08:21 WG1940230
1,2-Dichloroethane ND Q 10.0 10 10/11/2022 08:21 WG1940230
1,1-Dichloroethene ND Q 10.0 10 10/11/2022 08:21 WG1940230
cis-1,2-Dichloroethene ND Q 10.0 10 10/11/2022 08:21 WG1940230
trans-1,2-Dichloroethene ND Q 10.0 10 10/11/2022 08:21 WG1940230
1,2-Dichloropropane ND Q 10.0 10 10/11/2022 08:21 WG1940230
1,1-Dichloropropene ND Q 10.0 10 10/11/2022 08:21 WG1940230
1,3-Dichloropropane ND Q 10.0 10 10/11/2022 08:21 WG1940230
2,2-Dichloropropane ND Q 10.0 10 10/11/2022 08:21 WG1940230
Di-isopropyl ether ND Q 10.0 10 10/11/2022 08:21 WG1940230
Ethylbenzene 140 Q 10.0 10 10/11/2022 08:21 WG1940230
Hexachloro-1,3-butadiene ND Q 10.0 10 10/11/2022 08:21 WG1940230
Isopropylbenzene ND Q 10.0 10 10/11/2022 08:21 WG1940230
p-Isopropyltoluene ND Q 10.0 10 10/11/2022 08:21 WG1940230
2-Butanone (MEK)ND Q 100 10 10/11/2022 08:21 WG1940230
Methylene Chloride ND Q 50.0 10 10/11/2022 08:21 WG1940230
4-Methyl-2-pentanone (MIBK)ND Q 100 10 10/11/2022 08:21 WG1940230
Methyl tert-butyl ether ND Q 10.0 10 10/11/2022 08:21 WG1940230
Naphthalene ND Q 50.0 10 10/11/2022 08:21 WG1940230
n-Propylbenzene 22.6 Q 10.0 10 10/11/2022 08:21 WG1940230
Styrene ND Q 10.0 10 10/11/2022 08:21 WG1940230
1,1,1,2-Tetrachloroethane ND Q 10.0 10 10/11/2022 08:21 WG1940230
1,1,2,2-Tetrachloroethane ND Q 10.0 10 10/11/2022 08:21 WG1940230
Tetrachloroethene ND Q 10.0 10 10/11/2022 08:21 WG1940230
Toluene 18.8 Q 10.0 10 10/11/2022 08:21 WG1940230
1,2,3-Trichlorobenzene ND Q 10.0 10 10/11/2022 08:21 WG1940230
1,2,4-Trichlorobenzene ND Q 10.0 10 10/11/2022 08:21 WG1940230
1,1,1-Trichloroethane ND Q 10.0 10 10/11/2022 08:21 WG1940230
1,1,2-Trichloroethane ND Q 10.0 10 10/11/2022 08:21 WG1940230
Trichloroethene ND Q 10.0 10 10/11/2022 08:21 WG1940230
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 09:32 8 of 47
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 10:04 8 of 47
SAMPLE RESULTS - 02
L1540642
MW-15
Collected date/time: 09/26/22 14:05
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Trichlorofluoromethane ND Q 50.0 10 10/11/2022 08:21 WG1940230
1,2,3-Trichloropropane ND Q 25.0 10 10/11/2022 08:21 WG1940230
1,2,4-Trimethylbenzene 134 Q 10.0 10 10/11/2022 08:21 WG1940230
1,3,5-Trimethylbenzene 34.4 Q 10.0 10 10/11/2022 08:21 WG1940230
Vinyl chloride ND Q 10.0 10 10/11/2022 08:21 WG1940230
o-Xylene 36.0 Q 10.0 10 10/11/2022 08:21 WG1940230
m&p-Xylenes 232 Q 20.0 10 10/11/2022 08:21 WG1940230
(S) Toluene-d8 105 80.0-120 10/11/2022 08:21 WG1940230
(S) 4-Bromofluorobenzene 102 77.0-126 10/11/2022 08:21 WG1940230
(S) 1,2-Dichloroethane-d4 93.3 70.0-130 10/11/2022 08:21 WG1940230
Sample Narrative:
L1540642-02 WG1940230: Analyzed out of hold due to laboratory error
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 09:32 9 of 47
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 10:04 9 of 47
SAMPLE RESULTS - 03
L1540642
MW-17
Collected date/time: 09/26/22 14:45
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Acetone ND J4 50.0 1 10/06/2022 14:06 WG1938382
Acrolein ND 50.0 1 10/06/2022 14:06 WG1938382
Acrylonitrile ND 10.0 1 10/06/2022 14:06 WG1938382
Benzene 5.03 1.00 1 10/06/2022 14:06 WG1938382
Bromobenzene ND 1.00 1 10/06/2022 14:06 WG1938382
Bromodichloromethane ND 1.00 1 10/06/2022 14:06 WG1938382
Bromoform ND 1.00 1 10/06/2022 14:06 WG1938382
Bromomethane ND 5.00 1 10/06/2022 14:06 WG1938382
n-Butylbenzene ND 1.00 1 10/06/2022 14:06 WG1938382
sec-Butylbenzene ND 1.00 1 10/06/2022 14:06 WG1938382
tert-Butylbenzene ND 1.00 1 10/06/2022 14:06 WG1938382
Carbon tetrachloride ND 1.00 1 10/06/2022 14:06 WG1938382
Chlorobenzene ND 1.00 1 10/06/2022 14:06 WG1938382
Chlorodibromomethane ND 1.00 1 10/06/2022 14:06 WG1938382
Chloroethane ND 5.00 1 10/06/2022 14:06 WG1938382
Chloroform ND 5.00 1 10/06/2022 14:06 WG1938382
Chloromethane ND 2.50 1 10/06/2022 14:06 WG1938382
2-Chlorotoluene ND 1.00 1 10/06/2022 14:06 WG1938382
4-Chlorotoluene ND 1.00 1 10/06/2022 14:06 WG1938382
1,2-Dibromo-3-Chloropropane ND 5.00 1 10/06/2022 14:06 WG1938382
1,2-Dibromoethane ND 1.00 1 10/06/2022 14:06 WG1938382
Dibromomethane ND 1.00 1 10/06/2022 14:06 WG1938382
1,2-Dichlorobenzene ND 1.00 1 10/06/2022 14:06 WG1938382
1,3-Dichlorobenzene ND 1.00 1 10/06/2022 14:06 WG1938382
1,4-Dichlorobenzene ND 1.00 1 10/06/2022 14:06 WG1938382
Dichlorodifluoromethane ND 5.00 1 10/06/2022 14:06 WG1938382
1,1-Dichloroethane ND 1.00 1 10/06/2022 14:06 WG1938382
1,2-Dichloroethane ND 1.00 1 10/06/2022 14:06 WG1938382
1,1-Dichloroethene ND 1.00 1 10/06/2022 14:06 WG1938382
cis-1,2-Dichloroethene ND 1.00 1 10/06/2022 14:06 WG1938382
trans-1,2-Dichloroethene ND 1.00 1 10/06/2022 14:06 WG1938382
1,2-Dichloropropane ND 1.00 1 10/06/2022 14:06 WG1938382
1,1-Dichloropropene ND 1.00 1 10/06/2022 14:06 WG1938382
1,3-Dichloropropane ND 1.00 1 10/06/2022 14:06 WG1938382
2,2-Dichloropropane ND 1.00 1 10/06/2022 14:06 WG1938382
Di-isopropyl ether 1.14 1.00 1 10/06/2022 14:06 WG1938382
Ethylbenzene 40.3 1.00 1 10/06/2022 14:06 WG1938382
Hexachloro-1,3-butadiene ND 1.00 1 10/06/2022 14:06 WG1938382
Isopropylbenzene 2.89 1.00 1 10/06/2022 14:06 WG1938382
p-Isopropyltoluene ND 1.00 1 10/06/2022 14:06 WG1938382
2-Butanone (MEK)ND 10.0 1 10/06/2022 14:06 WG1938382
Methylene Chloride ND 5.00 1 10/06/2022 14:06 WG1938382
4-Methyl-2-pentanone (MIBK)ND 10.0 1 10/06/2022 14:06 WG1938382
Methyl tert-butyl ether ND 1.00 1 10/06/2022 14:06 WG1938382
Naphthalene 9.77 5.00 1 10/06/2022 14:06 WG1938382
n-Propylbenzene 8.36 1.00 1 10/06/2022 14:06 WG1938382
Styrene ND 1.00 1 10/06/2022 14:06 WG1938382
1,1,1,2-Tetrachloroethane ND 1.00 1 10/06/2022 14:06 WG1938382
1,1,2,2-Tetrachloroethane ND 1.00 1 10/06/2022 14:06 WG1938382
Tetrachloroethene ND 1.00 1 10/06/2022 14:06 WG1938382
Toluene 2.24 1.00 1 10/06/2022 14:06 WG1938382
1,2,3-Trichlorobenzene ND Q 1.00 1 10/11/2022 04:13 WG1940230
1,2,4-Trichlorobenzene ND 1.00 1 10/06/2022 14:06 WG1938382
1,1,1-Trichloroethane ND 1.00 1 10/06/2022 14:06 WG1938382
1,1,2-Trichloroethane ND 1.00 1 10/06/2022 14:06 WG1938382
Trichloroethene ND 1.00 1 10/06/2022 14:06 WG1938382
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 09:32 10 of 47
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 10:04 10 of 47
SAMPLE RESULTS - 03
L1540642
MW-17
Collected date/time: 09/26/22 14:45
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Trichlorofluoromethane ND 5.00 1 10/06/2022 14:06 WG1938382
1,2,3-Trichloropropane ND 2.50 1 10/06/2022 14:06 WG1938382
1,2,4-Trimethylbenzene 53.8 1.00 1 10/06/2022 14:06 WG1938382
1,3,5-Trimethylbenzene 5.70 1.00 1 10/06/2022 14:06 WG1938382
Vinyl chloride ND 1.00 1 10/06/2022 14:06 WG1938382
o-Xylene 4.16 1.00 1 10/06/2022 14:06 WG1938382
m&p-Xylenes 68.5 2.00 1 10/06/2022 14:06 WG1938382
(S) Toluene-d8 107 80.0-120 10/06/2022 14:06 WG1938382
(S) Toluene-d8 106 80.0-120 10/11/2022 04:13 WG1940230
(S) 4-Bromofluorobenzene 95.1 77.0-126 10/06/2022 14:06 WG1938382
(S) 4-Bromofluorobenzene 101 77.0-126 10/11/2022 04:13 WG1940230
(S) 1,2-Dichloroethane-d4 126 70.0-130 10/06/2022 14:06 WG1938382
(S) 1,2-Dichloroethane-d4 92.2 70.0-130 10/11/2022 04:13 WG1940230
Sample Narrative:
L1540642-03 WG1940230: 1,2,3-TCB re-analyzed out of hold due to failing QC in initial in hold run
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 09:32 11 of 47
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 10:04 11 of 47
SAMPLE RESULTS - 04
L1540642
MW-13
Collected date/time: 09/26/22 16:00
Volatile Petroleum Hydrocarbons by Method MADEPV
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Unadjusted C5-C8 Aliphatics ND 100 1 10/04/2022 17:03 WG1936695
Unadjusted C9-C12 Aliphatics 151 100 1 10/04/2022 17:03 WG1936695
Unadjusted C9-C10 Aromatics 164 100 1 10/04/2022 17:03 WG1936695
Total VPH 315 100 1 10/04/2022 17:03 WG1936695
(S) 2,5-Dibromotoluene(FID)93.0 70.0-130 10/04/2022 17:03 WG1936695
(S) 2,5-Dibromotoluene(PID)93.4 70.0-130 10/04/2022 17:03 WG1936695
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Acetone ND J4 250 5 10/06/2022 18:10 WG1938382
Acrolein ND 250 5 10/06/2022 18:10 WG1938382
Acrylonitrile ND 50.0 5 10/06/2022 18:10 WG1938382
Benzene ND 5.00 5 10/06/2022 18:10 WG1938382
Bromobenzene ND 5.00 5 10/06/2022 18:10 WG1938382
Bromodichloromethane ND 5.00 5 10/06/2022 18:10 WG1938382
Bromoform ND 5.00 5 10/06/2022 18:10 WG1938382
Bromomethane ND 25.0 5 10/06/2022 18:10 WG1938382
n-Butylbenzene ND 5.00 5 10/06/2022 18:10 WG1938382
sec-Butylbenzene ND 5.00 5 10/06/2022 18:10 WG1938382
tert-Butylbenzene ND 5.00 5 10/06/2022 18:10 WG1938382
Carbon tetrachloride ND 5.00 5 10/06/2022 18:10 WG1938382
Chlorobenzene ND 5.00 5 10/06/2022 18:10 WG1938382
Chlorodibromomethane ND 5.00 5 10/06/2022 18:10 WG1938382
Chloroethane ND 25.0 5 10/06/2022 18:10 WG1938382
Chloroform ND 25.0 5 10/06/2022 18:10 WG1938382
Chloromethane ND 12.5 5 10/06/2022 18:10 WG1938382
2-Chlorotoluene ND 5.00 5 10/06/2022 18:10 WG1938382
4-Chlorotoluene ND 5.00 5 10/06/2022 18:10 WG1938382
1,2-Dibromo-3-Chloropropane ND 25.0 5 10/06/2022 18:10 WG1938382
1,2-Dibromoethane ND 5.00 5 10/06/2022 18:10 WG1938382
Dibromomethane ND 5.00 5 10/06/2022 18:10 WG1938382
1,2-Dichlorobenzene ND 5.00 5 10/06/2022 18:10 WG1938382
1,3-Dichlorobenzene ND 5.00 5 10/06/2022 18:10 WG1938382
1,4-Dichlorobenzene ND 5.00 5 10/06/2022 18:10 WG1938382
Dichlorodifluoromethane ND 25.0 5 10/06/2022 18:10 WG1938382
1,1-Dichloroethane ND 5.00 5 10/06/2022 18:10 WG1938382
1,2-Dichloroethane ND 5.00 5 10/06/2022 18:10 WG1938382
1,1-Dichloroethene ND 5.00 5 10/06/2022 18:10 WG1938382
cis-1,2-Dichloroethene ND 5.00 5 10/06/2022 18:10 WG1938382
trans-1,2-Dichloroethene ND 5.00 5 10/06/2022 18:10 WG1938382
1,2-Dichloropropane ND 5.00 5 10/06/2022 18:10 WG1938382
1,1-Dichloropropene ND 5.00 5 10/06/2022 18:10 WG1938382
1,3-Dichloropropane ND 5.00 5 10/06/2022 18:10 WG1938382
2,2-Dichloropropane ND 5.00 5 10/06/2022 18:10 WG1938382
Di-isopropyl ether ND 5.00 5 10/06/2022 18:10 WG1938382
Ethylbenzene ND 5.00 5 10/06/2022 18:10 WG1938382
Hexachloro-1,3-butadiene ND 5.00 5 10/06/2022 18:10 WG1938382
Isopropylbenzene ND 5.00 5 10/06/2022 18:10 WG1938382
p-Isopropyltoluene ND 5.00 5 10/06/2022 18:10 WG1938382
2-Butanone (MEK)ND 50.0 5 10/06/2022 18:10 WG1938382
Methylene Chloride ND 25.0 5 10/06/2022 18:10 WG1938382
4-Methyl-2-pentanone (MIBK)ND 50.0 5 10/06/2022 18:10 WG1938382
Methyl tert-butyl ether ND 5.00 5 10/06/2022 18:10 WG1938382
Naphthalene ND 25.0 5 10/06/2022 18:10 WG1938382
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 09:32 12 of 47
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 10:04 12 of 47
SAMPLE RESULTS - 04
L1540642
MW-13
Collected date/time: 09/26/22 16:00
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
n-Propylbenzene ND 5.00 5 10/06/2022 18:10 WG1938382
Styrene ND 5.00 5 10/06/2022 18:10 WG1938382
1,1,1,2-Tetrachloroethane ND 5.00 5 10/06/2022 18:10 WG1938382
1,1,2,2-Tetrachloroethane ND 5.00 5 10/06/2022 18:10 WG1938382
Tetrachloroethene ND 5.00 5 10/06/2022 18:10 WG1938382
Toluene ND 5.00 5 10/06/2022 18:10 WG1938382
1,2,3-Trichlorobenzene ND Q 5.00 5 10/11/2022 08:44 WG1940230
1,2,4-Trichlorobenzene ND 5.00 5 10/06/2022 18:10 WG1938382
1,1,1-Trichloroethane ND 5.00 5 10/06/2022 18:10 WG1938382
1,1,2-Trichloroethane ND 5.00 5 10/06/2022 18:10 WG1938382
Trichloroethene ND 5.00 5 10/06/2022 18:10 WG1938382
Trichlorofluoromethane ND 25.0 5 10/06/2022 18:10 WG1938382
1,2,3-Trichloropropane ND 12.5 5 10/06/2022 18:10 WG1938382
1,2,4-Trimethylbenzene 11.5 5.00 5 10/06/2022 18:10 WG1938382
1,3,5-Trimethylbenzene ND 5.00 5 10/06/2022 18:10 WG1938382
Vinyl chloride ND 5.00 5 10/06/2022 18:10 WG1938382
o-Xylene ND 5.00 5 10/06/2022 18:10 WG1938382
m&p-Xylenes ND 10.0 5 10/06/2022 18:10 WG1938382
(S) Toluene-d8 110 80.0-120 10/06/2022 18:10 WG1938382
(S) Toluene-d8 108 80.0-120 10/11/2022 08:44 WG1940230
(S) 4-Bromofluorobenzene 97.9 77.0-126 10/06/2022 18:10 WG1938382
(S) 4-Bromofluorobenzene 102 77.0-126 10/11/2022 08:44 WG1940230
(S) 1,2-Dichloroethane-d4 125 70.0-130 10/06/2022 18:10 WG1938382
(S) 1,2-Dichloroethane-d4 94.9 70.0-130 10/11/2022 08:44 WG1940230
Sample Narrative:
L1540642-04 WG1940230: 1,2,3-TCB re-analyzed out of hold due to failing QC in initial in hold run
TPH by Method MADEPE
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Unadjusted C9-C18 Aliphatics ND 100 1 10/06/2022 17:39 WG1937846
Unadjusted C19-C36 Aliphatics ND 100 1 10/06/2022 17:39 WG1937846
Unadjusted C11-C22 Aromatics 142 100 1 10/06/2022 23:51 WG1937846
Unadjusted Total Petroleum
Hydrocarbons 142 100 1 10/06/2022 17:39 WG1937846
(S) o-Terphenyl 75.0 40.0-140 10/06/2022 23:51 WG1937846
(S) 1-Chloro-octadecane 57.5 40.0-140 10/06/2022 17:39 WG1937846
(S) 2-Fluorobiphenyl 84.7 40.0-140 10/06/2022 23:51 WG1937846
(S) 2-Bromonaphthalene 83.1 40.0-140 10/06/2022 23:51 WG1937846
Semi Volatile Organic Compounds (GC/MS) by Method 625.1
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Acenaphthene ND 1.00 1 10/03/2022 17:20 WG1935556
Acenaphthylene ND 1.00 1 10/03/2022 17:20 WG1935556
Anthracene ND 1.00 1 10/03/2022 17:20 WG1935556
Benzidine ND 10.0 1 10/03/2022 17:20 WG1935556
Benzo(a)anthracene ND 1.00 1 10/03/2022 17:20 WG1935556
Benzo(b)fluoranthene ND 1.00 1 10/03/2022 17:20 WG1935556
Benzo(k)fluoranthene ND 1.00 1 10/03/2022 17:20 WG1935556
Benzo(g,h,i)perylene ND 1.00 1 10/03/2022 17:20 WG1935556
Benzo(a)pyrene ND 1.00 1 10/03/2022 17:20 WG1935556
Bis(2-chlorethoxy)methane ND 10.0 1 10/03/2022 17:20 WG1935556
Bis(2-chloroethyl)ether ND 10.0 1 10/03/2022 17:20 WG1935556
2,2-Oxybis(1-Chloropropane)ND 10.0 1 10/03/2022 17:20 WG1935556
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 10:04 13 of 47
SAMPLE RESULTS - 04
L1540642
MW-13
Collected date/time: 09/26/22 16:00
Semi Volatile Organic Compounds (GC/MS) by Method 625.1
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
4-Bromophenyl-phenylether ND 10.0 1 10/03/2022 17:20 WG1935556
2-Chloronaphthalene ND 1.00 1 10/03/2022 17:20 WG1935556
4-Chlorophenyl-phenylether ND 10.0 1 10/03/2022 17:20 WG1935556
Chrysene ND 1.00 1 10/03/2022 17:20 WG1935556
Dibenz(a,h)anthracene ND 1.00 1 10/03/2022 17:20 WG1935556
3,3-Dichlorobenzidine ND 10.0 1 10/03/2022 17:20 WG1935556
2,4-Dinitrotoluene ND 10.0 1 10/03/2022 17:20 WG1935556
2,6-Dinitrotoluene ND 10.0 1 10/03/2022 17:20 WG1935556
Fluoranthene ND 1.00 1 10/03/2022 17:20 WG1935556
Fluorene ND 1.00 1 10/03/2022 17:20 WG1935556
Hexachlorobenzene ND 1.00 1 10/03/2022 17:20 WG1935556
Hexachloro-1,3-butadiene ND 10.0 1 10/03/2022 17:20 WG1935556
Hexachlorocyclopentadiene ND 10.0 1 10/03/2022 17:20 WG1935556
Hexachloroethane ND 10.0 1 10/03/2022 17:20 WG1935556
Indeno(1,2,3-cd)pyrene ND 1.00 1 10/03/2022 17:20 WG1935556
Isophorone ND 10.0 1 10/03/2022 17:20 WG1935556
Naphthalene ND 1.00 1 10/03/2022 17:20 WG1935556
Nitrobenzene ND 10.0 1 10/03/2022 17:20 WG1935556
n-Nitrosodimethylamine ND 10.0 1 10/03/2022 17:20 WG1935556
n-Nitrosodiphenylamine ND 10.0 1 10/03/2022 17:20 WG1935556
n-Nitrosodi-n-propylamine ND 10.0 1 10/03/2022 17:20 WG1935556
Phenanthrene ND 1.00 1 10/03/2022 17:20 WG1935556
Benzylbutyl phthalate ND 3.00 1 10/03/2022 17:20 WG1935556
Bis(2-ethylhexyl)phthalate ND 3.00 1 10/03/2022 17:20 WG1935556
Di-n-butyl phthalate ND 3.00 1 10/03/2022 17:20 WG1935556
Diethyl phthalate ND 3.00 1 10/03/2022 17:20 WG1935556
Dimethyl phthalate ND 3.00 1 10/03/2022 17:20 WG1935556
Di-n-octyl phthalate ND 3.00 1 10/03/2022 17:20 WG1935556
Pyrene ND 1.00 1 10/03/2022 17:20 WG1935556
1,2,4-Trichlorobenzene ND 10.0 1 10/03/2022 17:20 WG1935556
4-Chloro-3-methylphenol ND 10.0 1 10/03/2022 17:20 WG1935556
2-Chlorophenol ND 10.0 1 10/03/2022 17:20 WG1935556
2,4-Dichlorophenol ND 10.0 1 10/03/2022 17:20 WG1935556
2,4-Dimethylphenol ND 10.0 1 10/03/2022 17:20 WG1935556
4,6-Dinitro-2-methylphenol ND 10.0 1 10/03/2022 17:20 WG1935556
2,4-Dinitrophenol ND 10.0 1 10/03/2022 17:20 WG1935556
2-Nitrophenol ND 10.0 1 10/03/2022 17:20 WG1935556
4-Nitrophenol ND 10.0 1 10/03/2022 17:20 WG1935556
Pentachlorophenol ND 10.0 1 10/03/2022 17:20 WG1935556
Phenol ND 10.0 1 10/03/2022 17:20 WG1935556
2,4,6-Trichlorophenol ND 10.0 1 10/03/2022 17:20 WG1935556
(S) 2-Fluorophenol 29.7 10.0-120 10/03/2022 17:20 WG1935556
(S) Phenol-d5 17.5 8.00-424 10/03/2022 17:20 WG1935556
(S) Nitrobenzene-d5 72.4 15.0-314 10/03/2022 17:20 WG1935556
(S) 2-Fluorobiphenyl 51.0 22.0-127 10/03/2022 17:20 WG1935556
(S) 2,4,6-Tribromophenol 47.1 10.0-153 10/03/2022 17:20 WG1935556
(S) p-Terphenyl-d14 30.5 29.0-141 10/03/2022 17:20 WG1935556
Semi Volatile Organic Compounds (GC/MS) by Method 625.1 - TENTATIVELY IDENTIFIED COMPOUNDS
Result Qualifier RDL Dilution Analysis Batch CAS #RT
Analyte ug/l ug/l date / time
Unknown-02 9.82 J N 0.000 1 10/03/2022 17:20 WG1935556 004291-79-6 2.05
Unknown-01 9.62 J N 0.000 1 10/03/2022 17:20 WG1935556 001576-87-0 1.92
Unknown-03 6.92 J N 0.000 1 10/03/2022 17:20 WG1935556 000934-10-1 2.90
Benzene, 1,2,4,5-Tetramethyl-4.63 J N 0.000 1 10/03/2022 17:20 WG1935556 000095-93-2 2.76
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 09:32 14 of 47
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 10:04 14 of 47
SAMPLE RESULTS - 04
L1540642
MW-13
Collected date/time: 09/26/22 16:00
Semi Volatile Organic Compounds (GC/MS) by Method 625.1 - TENTATIVELY IDENTIFIED COMPOUNDS
Result Qualifier RDL Dilution Analysis Batch CAS #RT
Analyte ug/l ug/l date / time
Tentatively Identified compounds (TIC) refers to substances not present in the list of target compounds. Therefore, not all TICs are identified and quantitated using individual standards. TIC
listings are prepared utilizing a computerized library search routine of electron impact mass spectral data and evaluation of the relevant data by a mass spectral data specialist. Quantitation is
accomplished by relative peak area of the TIC compared to that of the nearest internal standard from the total ion chromatogram. TICs are identified and quantitated only if the peak area is
10% or more of that of the nearest internal standard.
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 09:32 15 of 47
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 10:04 15 of 47
SAMPLE RESULTS - 05
L1540642
MW-4
Collected date/time: 09/26/22 16:35
Volatile Petroleum Hydrocarbons by Method MADEPV
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Unadjusted C5-C8 Aliphatics ND 100 1 10/04/2022 17:36 WG1936695
Unadjusted C9-C12 Aliphatics ND 100 1 10/04/2022 17:36 WG1936695
Unadjusted C9-C10 Aromatics ND 100 1 10/04/2022 17:36 WG1936695
Total VPH ND 100 1 10/04/2022 17:36 WG1936695
(S) 2,5-Dibromotoluene(FID)91.8 70.0-130 10/04/2022 17:36 WG1936695
(S) 2,5-Dibromotoluene(PID)96.5 70.0-130 10/04/2022 17:36 WG1936695
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Acetone ND J4 50.0 1 10/06/2022 14:26 WG1938382
Acrolein ND 50.0 1 10/06/2022 14:26 WG1938382
Acrylonitrile ND 10.0 1 10/06/2022 14:26 WG1938382
Benzene ND 1.00 1 10/06/2022 14:26 WG1938382
Bromobenzene ND 1.00 1 10/06/2022 14:26 WG1938382
Bromodichloromethane ND 1.00 1 10/06/2022 14:26 WG1938382
Bromoform ND 1.00 1 10/06/2022 14:26 WG1938382
Bromomethane ND 5.00 1 10/06/2022 14:26 WG1938382
n-Butylbenzene ND 1.00 1 10/06/2022 14:26 WG1938382
sec-Butylbenzene ND 1.00 1 10/06/2022 14:26 WG1938382
tert-Butylbenzene ND 1.00 1 10/06/2022 14:26 WG1938382
Carbon tetrachloride ND 1.00 1 10/06/2022 14:26 WG1938382
Chlorobenzene ND 1.00 1 10/06/2022 14:26 WG1938382
Chlorodibromomethane ND 1.00 1 10/06/2022 14:26 WG1938382
Chloroethane ND 5.00 1 10/06/2022 14:26 WG1938382
Chloroform ND 5.00 1 10/06/2022 14:26 WG1938382
Chloromethane ND 2.50 1 10/06/2022 14:26 WG1938382
2-Chlorotoluene ND 1.00 1 10/06/2022 14:26 WG1938382
4-Chlorotoluene ND 1.00 1 10/06/2022 14:26 WG1938382
1,2-Dibromo-3-Chloropropane ND 5.00 1 10/06/2022 14:26 WG1938382
1,2-Dibromoethane ND 1.00 1 10/06/2022 14:26 WG1938382
Dibromomethane ND 1.00 1 10/06/2022 14:26 WG1938382
1,2-Dichlorobenzene ND 1.00 1 10/06/2022 14:26 WG1938382
1,3-Dichlorobenzene ND 1.00 1 10/06/2022 14:26 WG1938382
1,4-Dichlorobenzene ND 1.00 1 10/06/2022 14:26 WG1938382
Dichlorodifluoromethane ND 5.00 1 10/06/2022 14:26 WG1938382
1,1-Dichloroethane ND 1.00 1 10/06/2022 14:26 WG1938382
1,2-Dichloroethane ND 1.00 1 10/06/2022 14:26 WG1938382
1,1-Dichloroethene ND 1.00 1 10/06/2022 14:26 WG1938382
cis-1,2-Dichloroethene ND 1.00 1 10/06/2022 14:26 WG1938382
trans-1,2-Dichloroethene ND 1.00 1 10/06/2022 14:26 WG1938382
1,2-Dichloropropane ND 1.00 1 10/06/2022 14:26 WG1938382
1,1-Dichloropropene ND 1.00 1 10/06/2022 14:26 WG1938382
1,3-Dichloropropane ND 1.00 1 10/06/2022 14:26 WG1938382
2,2-Dichloropropane ND 1.00 1 10/06/2022 14:26 WG1938382
Di-isopropyl ether ND 1.00 1 10/06/2022 14:26 WG1938382
Ethylbenzene ND 1.00 1 10/06/2022 14:26 WG1938382
Hexachloro-1,3-butadiene ND 1.00 1 10/06/2022 14:26 WG1938382
Isopropylbenzene ND 1.00 1 10/06/2022 14:26 WG1938382
p-Isopropyltoluene ND 1.00 1 10/06/2022 14:26 WG1938382
2-Butanone (MEK)ND 10.0 1 10/06/2022 14:26 WG1938382
Methylene Chloride ND 5.00 1 10/06/2022 14:26 WG1938382
4-Methyl-2-pentanone (MIBK)ND 10.0 1 10/06/2022 14:26 WG1938382
Methyl tert-butyl ether ND 1.00 1 10/06/2022 14:26 WG1938382
Naphthalene ND 5.00 1 10/06/2022 14:26 WG1938382
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 09:32 16 of 47
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 10:04 16 of 47
SAMPLE RESULTS - 05
L1540642
MW-4
Collected date/time: 09/26/22 16:35
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
n-Propylbenzene ND 1.00 1 10/06/2022 14:26 WG1938382
Styrene ND 1.00 1 10/06/2022 14:26 WG1938382
1,1,1,2-Tetrachloroethane ND 1.00 1 10/06/2022 14:26 WG1938382
1,1,2,2-Tetrachloroethane ND 1.00 1 10/06/2022 14:26 WG1938382
Tetrachloroethene ND 1.00 1 10/06/2022 14:26 WG1938382
Toluene ND 1.00 1 10/06/2022 14:26 WG1938382
1,2,3-Trichlorobenzene ND Q 1.00 1 10/11/2022 04:36 WG1940230
1,2,4-Trichlorobenzene ND 1.00 1 10/06/2022 14:26 WG1938382
1,1,1-Trichloroethane ND 1.00 1 10/06/2022 14:26 WG1938382
1,1,2-Trichloroethane ND 1.00 1 10/06/2022 14:26 WG1938382
Trichloroethene ND 1.00 1 10/06/2022 14:26 WG1938382
Trichlorofluoromethane ND 5.00 1 10/06/2022 14:26 WG1938382
1,2,3-Trichloropropane ND 2.50 1 10/06/2022 14:26 WG1938382
1,2,4-Trimethylbenzene ND 1.00 1 10/06/2022 14:26 WG1938382
1,3,5-Trimethylbenzene ND 1.00 1 10/06/2022 14:26 WG1938382
Vinyl chloride ND 1.00 1 10/06/2022 14:26 WG1938382
o-Xylene ND 1.00 1 10/06/2022 14:26 WG1938382
m&p-Xylenes ND 2.00 1 10/06/2022 14:26 WG1938382
(S) Toluene-d8 111 80.0-120 10/06/2022 14:26 WG1938382
(S) Toluene-d8 104 80.0-120 10/11/2022 04:36 WG1940230
(S) 4-Bromofluorobenzene 94.9 77.0-126 10/06/2022 14:26 WG1938382
(S) 4-Bromofluorobenzene 102 77.0-126 10/11/2022 04:36 WG1940230
(S) 1,2-Dichloroethane-d4 125 70.0-130 10/06/2022 14:26 WG1938382
(S) 1,2-Dichloroethane-d4 93.4 70.0-130 10/11/2022 04:36 WG1940230
Sample Narrative:
L1540642-05 WG1940230: 1,2,3-TCB re-analyzed out of hold due to failing QC in initial in hold run
TPH by Method MADEPE
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Unadjusted C9-C18 Aliphatics ND 100 1 10/06/2022 18:03 WG1937846
Unadjusted C19-C36 Aliphatics ND 100 1 10/06/2022 18:03 WG1937846
Unadjusted C11-C22 Aromatics ND 100 1 10/06/2022 23:25 WG1937846
Unadjusted Total Petroleum
Hydrocarbons ND 100 1 10/06/2022 18:03 WG1937846
(S) o-Terphenyl 66.7 40.0-140 10/06/2022 23:25 WG1937846
(S) 1-Chloro-octadecane 55.9 40.0-140 10/06/2022 18:03 WG1937846
(S) 2-Fluorobiphenyl 78.9 40.0-140 10/06/2022 23:25 WG1937846
(S) 2-Bromonaphthalene 76.5 40.0-140 10/06/2022 23:25 WG1937846
Semi Volatile Organic Compounds (GC/MS) by Method 625.1
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Acenaphthene ND 1.00 1 10/03/2022 17:41 WG1935556
Acenaphthylene ND 1.00 1 10/03/2022 17:41 WG1935556
Anthracene ND 1.00 1 10/03/2022 17:41 WG1935556
Benzidine ND 10.0 1 10/03/2022 17:41 WG1935556
Benzo(a)anthracene ND 1.00 1 10/03/2022 17:41 WG1935556
Benzo(b)fluoranthene ND 1.00 1 10/03/2022 17:41 WG1935556
Benzo(k)fluoranthene ND 1.00 1 10/03/2022 17:41 WG1935556
Benzo(g,h,i)perylene ND 1.00 1 10/03/2022 17:41 WG1935556
Benzo(a)pyrene ND 1.00 1 10/03/2022 17:41 WG1935556
Bis(2-chlorethoxy)methane ND 10.0 1 10/03/2022 17:41 WG1935556
Bis(2-chloroethyl)ether ND 10.0 1 10/03/2022 17:41 WG1935556
2,2-Oxybis(1-Chloropropane)ND 10.0 1 10/03/2022 17:41 WG1935556
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 09:32 17 of 47
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 10:04 17 of 47
SAMPLE RESULTS - 05
L1540642
MW-4
Collected date/time: 09/26/22 16:35
Semi Volatile Organic Compounds (GC/MS) by Method 625.1
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
4-Bromophenyl-phenylether ND 10.0 1 10/03/2022 17:41 WG1935556
2-Chloronaphthalene ND 1.00 1 10/03/2022 17:41 WG1935556
4-Chlorophenyl-phenylether ND 10.0 1 10/03/2022 17:41 WG1935556
Chrysene ND 1.00 1 10/03/2022 17:41 WG1935556
Dibenz(a,h)anthracene ND 1.00 1 10/03/2022 17:41 WG1935556
3,3-Dichlorobenzidine ND 10.0 1 10/03/2022 17:41 WG1935556
2,4-Dinitrotoluene ND 10.0 1 10/03/2022 17:41 WG1935556
2,6-Dinitrotoluene ND 10.0 1 10/03/2022 17:41 WG1935556
Fluoranthene ND 1.00 1 10/03/2022 17:41 WG1935556
Fluorene ND 1.00 1 10/03/2022 17:41 WG1935556
Hexachlorobenzene ND 1.00 1 10/03/2022 17:41 WG1935556
Hexachloro-1,3-butadiene ND 10.0 1 10/03/2022 17:41 WG1935556
Hexachlorocyclopentadiene ND 10.0 1 10/03/2022 17:41 WG1935556
Hexachloroethane ND 10.0 1 10/03/2022 17:41 WG1935556
Indeno(1,2,3-cd)pyrene ND 1.00 1 10/03/2022 17:41 WG1935556
Isophorone ND 10.0 1 10/03/2022 17:41 WG1935556
Naphthalene ND 1.00 1 10/03/2022 17:41 WG1935556
Nitrobenzene ND 10.0 1 10/03/2022 17:41 WG1935556
n-Nitrosodimethylamine ND 10.0 1 10/03/2022 17:41 WG1935556
n-Nitrosodiphenylamine ND 10.0 1 10/03/2022 17:41 WG1935556
n-Nitrosodi-n-propylamine ND 10.0 1 10/03/2022 17:41 WG1935556
Phenanthrene ND 1.00 1 10/03/2022 17:41 WG1935556
Benzylbutyl phthalate ND 3.00 1 10/03/2022 17:41 WG1935556
Bis(2-ethylhexyl)phthalate ND 3.00 1 10/03/2022 17:41 WG1935556
Di-n-butyl phthalate ND 3.00 1 10/03/2022 17:41 WG1935556
Diethyl phthalate ND 3.00 1 10/03/2022 17:41 WG1935556
Dimethyl phthalate ND 3.00 1 10/03/2022 17:41 WG1935556
Di-n-octyl phthalate ND 3.00 1 10/03/2022 17:41 WG1935556
Pyrene ND 1.00 1 10/03/2022 17:41 WG1935556
1,2,4-Trichlorobenzene ND 10.0 1 10/03/2022 17:41 WG1935556
4-Chloro-3-methylphenol ND 10.0 1 10/03/2022 17:41 WG1935556
2-Chlorophenol ND 10.0 1 10/03/2022 17:41 WG1935556
2,4-Dichlorophenol ND 10.0 1 10/03/2022 17:41 WG1935556
2,4-Dimethylphenol ND 10.0 1 10/03/2022 17:41 WG1935556
4,6-Dinitro-2-methylphenol ND 10.0 1 10/03/2022 17:41 WG1935556
2,4-Dinitrophenol ND 10.0 1 10/03/2022 17:41 WG1935556
2-Nitrophenol ND 10.0 1 10/03/2022 17:41 WG1935556
4-Nitrophenol ND 10.0 1 10/03/2022 17:41 WG1935556
Pentachlorophenol ND 10.0 1 10/03/2022 17:41 WG1935556
Phenol ND 10.0 1 10/03/2022 17:41 WG1935556
2,4,6-Trichlorophenol ND 10.0 1 10/03/2022 17:41 WG1935556
(S) 2-Fluorophenol 19.3 10.0-120 10/03/2022 17:41 WG1935556
(S) Phenol-d5 15.7 8.00-424 10/03/2022 17:41 WG1935556
(S) Nitrobenzene-d5 71.1 15.0-314 10/03/2022 17:41 WG1935556
(S) 2-Fluorobiphenyl 45.4 22.0-127 10/03/2022 17:41 WG1935556
(S) 2,4,6-Tribromophenol 31.9 10.0-153 10/03/2022 17:41 WG1935556
(S) p-Terphenyl-d14 28.4 J2 29.0-141 10/03/2022 17:41 WG1935556
Semi Volatile Organic Compounds (GC/MS) by Method 625.1 - TENTATIVELY IDENTIFIED COMPOUNDS
Result Qualifier RDL Dilution Analysis Batch CAS #RT
Analyte ug/l ug/l date / time
Unknown-02 10.6 J N 0.000 1 10/03/2022 17:41 WG1935556 000565-75-3 2.04
Unknown-01 9.80 J N 0.000 1 10/03/2022 17:41 WG1935556 001576-87-0 1.92
Unknown-04 6.92 J N 0.000 1 10/03/2022 17:41 WG1935556 000076-09-5 6.96
Unknown-03 5.52 J N 0.000 1 10/03/2022 17:41 WG1935556 010143-32-5 6.20
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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SAMPLE RESULTS - 05
L1540642
MW-4
Collected date/time: 09/26/22 16:35
Semi Volatile Organic Compounds (GC/MS) by Method 625.1 - TENTATIVELY IDENTIFIED COMPOUNDS
Result Qualifier RDL Dilution Analysis Batch CAS #RT
Analyte ug/l ug/l date / time
Tentatively Identified compounds (TIC) refers to substances not present in the list of target compounds. Therefore, not all TICs are identified and quantitated using individual standards. TIC
listings are prepared utilizing a computerized library search routine of electron impact mass spectral data and evaluation of the relevant data by a mass spectral data specialist. Quantitation is
accomplished by relative peak area of the TIC compared to that of the nearest internal standard from the total ion chromatogram. TICs are identified and quantitated only if the peak area is
10% or more of that of the nearest internal standard.
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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SAMPLE RESULTS - 06
L1540642
MW-11
Collected date/time: 09/26/22 15:00
Volatile Petroleum Hydrocarbons by Method MADEPV
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Unadjusted C5-C8 Aliphatics ND 100 1 10/04/2022 18:09 WG1936695
Unadjusted C9-C12 Aliphatics 2380 100 1 10/04/2022 18:09 WG1936695
Unadjusted C9-C10 Aromatics 1500 1000 10 10/06/2022 06:39 WG1937847
Total VPH 3880 1000 10 10/06/2022 06:39 WG1937847
(S) 2,5-Dibromotoluene(FID)289 J1 70.0-130 10/04/2022 18:09 WG1936695
(S) 2,5-Dibromotoluene(FID)93.7 70.0-130 10/06/2022 06:39 WG1937847
(S) 2,5-Dibromotoluene(PID)51.9 J2 70.0-130 10/04/2022 18:09 WG1936695
(S) 2,5-Dibromotoluene(PID)92.9 70.0-130 10/06/2022 06:39 WG1937847
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Acetone ND J4 500 10 10/06/2022 18:30 WG1938382
Acrolein ND 500 10 10/06/2022 18:30 WG1938382
Acrylonitrile ND 100 10 10/06/2022 18:30 WG1938382
Benzene ND 10.0 10 10/06/2022 18:30 WG1938382
Bromobenzene ND 10.0 10 10/06/2022 18:30 WG1938382
Bromodichloromethane ND 10.0 10 10/06/2022 18:30 WG1938382
Bromoform ND 10.0 10 10/06/2022 18:30 WG1938382
Bromomethane ND 50.0 10 10/06/2022 18:30 WG1938382
n-Butylbenzene ND 10.0 10 10/06/2022 18:30 WG1938382
sec-Butylbenzene ND 10.0 10 10/06/2022 18:30 WG1938382
tert-Butylbenzene ND 10.0 10 10/06/2022 18:30 WG1938382
Carbon tetrachloride ND 10.0 10 10/06/2022 18:30 WG1938382
Chlorobenzene ND 10.0 10 10/06/2022 18:30 WG1938382
Chlorodibromomethane ND 10.0 10 10/06/2022 18:30 WG1938382
Chloroethane ND 50.0 10 10/06/2022 18:30 WG1938382
Chloroform ND 50.0 10 10/06/2022 18:30 WG1938382
Chloromethane ND 25.0 10 10/06/2022 18:30 WG1938382
2-Chlorotoluene ND 10.0 10 10/06/2022 18:30 WG1938382
4-Chlorotoluene ND 10.0 10 10/06/2022 18:30 WG1938382
1,2-Dibromo-3-Chloropropane ND 50.0 10 10/06/2022 18:30 WG1938382
1,2-Dibromoethane ND 10.0 10 10/06/2022 18:30 WG1938382
Dibromomethane ND 10.0 10 10/06/2022 18:30 WG1938382
1,2-Dichlorobenzene ND 10.0 10 10/06/2022 18:30 WG1938382
1,3-Dichlorobenzene ND 10.0 10 10/06/2022 18:30 WG1938382
1,4-Dichlorobenzene ND 10.0 10 10/06/2022 18:30 WG1938382
Dichlorodifluoromethane ND 50.0 10 10/06/2022 18:30 WG1938382
1,1-Dichloroethane ND 10.0 10 10/06/2022 18:30 WG1938382
1,2-Dichloroethane ND 10.0 10 10/06/2022 18:30 WG1938382
1,1-Dichloroethene ND 10.0 10 10/06/2022 18:30 WG1938382
cis-1,2-Dichloroethene ND 10.0 10 10/06/2022 18:30 WG1938382
trans-1,2-Dichloroethene ND 10.0 10 10/06/2022 18:30 WG1938382
1,2-Dichloropropane ND 10.0 10 10/06/2022 18:30 WG1938382
1,1-Dichloropropene ND 10.0 10 10/06/2022 18:30 WG1938382
1,3-Dichloropropane ND 10.0 10 10/06/2022 18:30 WG1938382
2,2-Dichloropropane ND 10.0 10 10/06/2022 18:30 WG1938382
Di-isopropyl ether ND 10.0 10 10/06/2022 18:30 WG1938382
Ethylbenzene ND 10.0 10 10/06/2022 18:30 WG1938382
Hexachloro-1,3-butadiene ND 10.0 10 10/06/2022 18:30 WG1938382
Isopropylbenzene ND 10.0 10 10/06/2022 18:30 WG1938382
p-Isopropyltoluene ND 10.0 10 10/06/2022 18:30 WG1938382
2-Butanone (MEK)ND 100 10 10/06/2022 18:30 WG1938382
Methylene Chloride ND 50.0 10 10/06/2022 18:30 WG1938382
4-Methyl-2-pentanone (MIBK)ND 100 10 10/06/2022 18:30 WG1938382
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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SAMPLE RESULTS - 06
L1540642
MW-11
Collected date/time: 09/26/22 15:00
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Methyl tert-butyl ether ND 10.0 10 10/06/2022 18:30 WG1938382
Naphthalene ND 50.0 10 10/06/2022 18:30 WG1938382
n-Propylbenzene ND 10.0 10 10/06/2022 18:30 WG1938382
Styrene ND 10.0 10 10/06/2022 18:30 WG1938382
1,1,1,2-Tetrachloroethane ND 10.0 10 10/06/2022 18:30 WG1938382
1,1,2,2-Tetrachloroethane ND 10.0 10 10/06/2022 18:30 WG1938382
Tetrachloroethene ND 10.0 10 10/06/2022 18:30 WG1938382
Toluene ND 10.0 10 10/06/2022 18:30 WG1938382
1,2,3-Trichlorobenzene ND Q 10.0 10 10/11/2022 09:07 WG1940230
1,2,4-Trichlorobenzene ND 10.0 10 10/06/2022 18:30 WG1938382
1,1,1-Trichloroethane ND 10.0 10 10/06/2022 18:30 WG1938382
1,1,2-Trichloroethane ND 10.0 10 10/06/2022 18:30 WG1938382
Trichloroethene ND 10.0 10 10/06/2022 18:30 WG1938382
Trichlorofluoromethane ND 50.0 10 10/06/2022 18:30 WG1938382
1,2,3-Trichloropropane ND 25.0 10 10/06/2022 18:30 WG1938382
1,2,4-Trimethylbenzene 54.8 10.0 10 10/06/2022 18:30 WG1938382
1,3,5-Trimethylbenzene ND 10.0 10 10/06/2022 18:30 WG1938382
Vinyl chloride ND 10.0 10 10/06/2022 18:30 WG1938382
o-Xylene ND 10.0 10 10/06/2022 18:30 WG1938382
m&p-Xylenes ND 20.0 10 10/06/2022 18:30 WG1938382
(S) Toluene-d8 107 80.0-120 10/06/2022 18:30 WG1938382
(S) Toluene-d8 108 80.0-120 10/11/2022 09:07 WG1940230
(S) 4-Bromofluorobenzene 98.3 77.0-126 10/06/2022 18:30 WG1938382
(S) 4-Bromofluorobenzene 122 77.0-126 10/11/2022 09:07 WG1940230
(S) 1,2-Dichloroethane-d4 125 70.0-130 10/06/2022 18:30 WG1938382
(S) 1,2-Dichloroethane-d4 94.9 70.0-130 10/11/2022 09:07 WG1940230
Sample Narrative:
L1540642-06 WG1938382, WG1940230: Non-target compounds too high to run at a lower dilution.
L1540642-06 WG1938382, WG1940230: 1,2,3-TCB re-analyzed out of hold due to failing QC in initial in hold run
TPH by Method MADEPE
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Unadjusted C9-C18 Aliphatics 12000 500 5 10/07/2022 15:15 WG1937846
Unadjusted C19-C36 Aliphatics 282 100 1 10/06/2022 18:28 WG1937846
Unadjusted C11-C22 Aromatics 3300 100 1 10/06/2022 22:59 WG1937846
Unadjusted Total Petroleum
Hydrocarbons 15600 500 5 10/07/2022 15:15 WG1937846
(S) o-Terphenyl 79.0 40.0-140 10/06/2022 22:59 WG1937846
(S) 1-Chloro-octadecane 58.1 40.0-140 10/07/2022 15:15 WG1937846
(S) 1-Chloro-octadecane 65.9 40.0-140 10/06/2022 18:28 WG1937846
(S) 2-Fluorobiphenyl 94.6 40.0-140 10/06/2022 22:59 WG1937846
(S) 2-Bromonaphthalene 78.9 40.0-140 10/06/2022 22:59 WG1937846
Semi Volatile Organic Compounds (GC/MS) by Method 625.1
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Acenaphthene ND 1.00 1 10/03/2022 18:02 WG1935556
Acenaphthylene ND 1.00 1 10/03/2022 18:02 WG1935556
Anthracene ND 1.00 1 10/03/2022 18:02 WG1935556
Benzidine ND 10.0 1 10/03/2022 18:02 WG1935556
Benzo(a)anthracene ND 1.00 1 10/03/2022 18:02 WG1935556
Benzo(b)fluoranthene ND 1.00 1 10/03/2022 18:02 WG1935556
Benzo(k)fluoranthene ND 1.00 1 10/03/2022 18:02 WG1935556
Benzo(g,h,i)perylene ND 1.00 1 10/03/2022 18:02 WG1935556
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 10:04 21 of 47
SAMPLE RESULTS - 06
L1540642
MW-11
Collected date/time: 09/26/22 15:00
Semi Volatile Organic Compounds (GC/MS) by Method 625.1
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Benzo(a)pyrene ND 1.00 1 10/03/2022 18:02 WG1935556
Bis(2-chlorethoxy)methane ND 10.0 1 10/03/2022 18:02 WG1935556
Bis(2-chloroethyl)ether ND 10.0 1 10/03/2022 18:02 WG1935556
2,2-Oxybis(1-Chloropropane)ND 10.0 1 10/03/2022 18:02 WG1935556
4-Bromophenyl-phenylether ND 10.0 1 10/03/2022 18:02 WG1935556
2-Chloronaphthalene ND 1.00 1 10/03/2022 18:02 WG1935556
4-Chlorophenyl-phenylether ND 10.0 1 10/03/2022 18:02 WG1935556
Chrysene ND 1.00 1 10/03/2022 18:02 WG1935556
Dibenz(a,h)anthracene ND 1.00 1 10/03/2022 18:02 WG1935556
3,3-Dichlorobenzidine ND 10.0 1 10/03/2022 18:02 WG1935556
2,4-Dinitrotoluene ND 10.0 1 10/03/2022 18:02 WG1935556
2,6-Dinitrotoluene ND 10.0 1 10/03/2022 18:02 WG1935556
Fluoranthene ND 1.00 1 10/03/2022 18:02 WG1935556
Fluorene ND 1.00 1 10/03/2022 18:02 WG1935556
Hexachlorobenzene ND 1.00 1 10/03/2022 18:02 WG1935556
Hexachloro-1,3-butadiene ND 10.0 1 10/03/2022 18:02 WG1935556
Hexachlorocyclopentadiene ND 10.0 1 10/03/2022 18:02 WG1935556
Hexachloroethane ND 10.0 1 10/03/2022 18:02 WG1935556
Indeno(1,2,3-cd)pyrene ND 1.00 1 10/03/2022 18:02 WG1935556
Isophorone ND 10.0 1 10/03/2022 18:02 WG1935556
Naphthalene 3.52 1.00 1 10/03/2022 18:02 WG1935556
Nitrobenzene ND 10.0 1 10/03/2022 18:02 WG1935556
n-Nitrosodimethylamine ND 10.0 1 10/03/2022 18:02 WG1935556
n-Nitrosodiphenylamine ND 10.0 1 10/03/2022 18:02 WG1935556
n-Nitrosodi-n-propylamine ND 10.0 1 10/03/2022 18:02 WG1935556
Phenanthrene ND 1.00 1 10/03/2022 18:02 WG1935556
Benzylbutyl phthalate ND 3.00 1 10/03/2022 18:02 WG1935556
Bis(2-ethylhexyl)phthalate ND 3.00 1 10/03/2022 18:02 WG1935556
Di-n-butyl phthalate ND 3.00 1 10/03/2022 18:02 WG1935556
Diethyl phthalate ND 3.00 1 10/03/2022 18:02 WG1935556
Dimethyl phthalate ND 3.00 1 10/03/2022 18:02 WG1935556
Di-n-octyl phthalate ND 3.00 1 10/03/2022 18:02 WG1935556
Pyrene ND 1.00 1 10/03/2022 18:02 WG1935556
1,2,4-Trichlorobenzene ND 10.0 1 10/03/2022 18:02 WG1935556
4-Chloro-3-methylphenol ND 10.0 1 10/03/2022 18:02 WG1935556
2-Chlorophenol ND 10.0 1 10/03/2022 18:02 WG1935556
2,4-Dichlorophenol ND 10.0 1 10/03/2022 18:02 WG1935556
2,4-Dimethylphenol ND 10.0 1 10/03/2022 18:02 WG1935556
4,6-Dinitro-2-methylphenol ND 10.0 1 10/03/2022 18:02 WG1935556
2,4-Dinitrophenol ND 10.0 1 10/03/2022 18:02 WG1935556
2-Nitrophenol ND 10.0 1 10/03/2022 18:02 WG1935556
4-Nitrophenol ND 10.0 1 10/03/2022 18:02 WG1935556
Pentachlorophenol ND 10.0 1 10/03/2022 18:02 WG1935556
Phenol ND 10.0 1 10/03/2022 18:02 WG1935556
2,4,6-Trichlorophenol ND 10.0 1 10/03/2022 18:02 WG1935556
(S) 2-Fluorophenol 27.3 10.0-120 10/03/2022 18:02 WG1935556
(S) Phenol-d5 17.8 8.00-424 10/03/2022 18:02 WG1935556
(S) Nitrobenzene-d5 53.0 15.0-314 10/03/2022 18:02 WG1935556
(S) 2-Fluorobiphenyl 35.9 22.0-127 10/03/2022 18:02 WG1935556
(S) 2,4,6-Tribromophenol 39.1 10.0-153 10/03/2022 18:02 WG1935556
(S) p-Terphenyl-d14 28.7 J2 29.0-141 10/03/2022 18:02 WG1935556
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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SAMPLE RESULTS - 06
L1540642
MW-11
Collected date/time: 09/26/22 15:00
Semi Volatile Organic Compounds (GC/MS) by Method 625.1 - TENTATIVELY IDENTIFIED COMPOUNDS
Result Qualifier RDL Dilution Analysis Batch CAS #RT
Analyte ug/l ug/l date / time
Unknown-10 166 J N 0.000 1 10/03/2022 18:02 WG1935556 005911-04-6 3.33
Tetradecane 158 J N 0.000 1 10/03/2022 18:02 WG1935556 000629-59-4 3.99
Pentadecane, 2,6,10,14-Tetramethyl 130 J N 0.000 1 10/03/2022 18:02 WG1935556 001921-70-6 4.80
Unknown-01 71.4 J N 0.000 1 10/03/2022 18:02 WG1935556 003304-28-7 2.77
Unknown-02 62.1 J N 0.000 1 10/03/2022 18:02 WG1935556 050746-53-7 2.84
Unknown-11 53.1 J N 0.000 1 10/03/2022 18:02 WG1935556 053447-47-5 3.43
Tridecane, 5-Propyl-48.4 J N 0.000 1 10/03/2022 18:02 WG1935556 055045-11-9 4.61
Unknown-08 46.9 J N 0.000 1 10/03/2022 18:02 WG1935556 052417-50-2 3.22
Unknown-05 46.1 J N 0.000 1 10/03/2022 18:02 WG1935556 016251-77-7 2.96
Unknown-07 43.4 J N 0.000 1 10/03/2022 18:02 WG1935556 074630-40-3 3.17
Tentatively Identified compounds (TIC) refers to substances not present in the list of target compounds. Therefore, not all TICs are identified and quantitated using individual standards. TIC
listings are prepared utilizing a computerized library search routine of electron impact mass spectral data and evaluation of the relevant data by a mass spectral data specialist. Quantitation is
accomplished by relative peak area of the TIC compared to that of the nearest internal standard from the total ion chromatogram. TICs are identified and quantitated only if the peak area is
10% or more of that of the nearest internal standard.
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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SAMPLE RESULTS - 07
L1540642
FB-1
Collected date/time: 09/26/22 16:30
Volatile Petroleum Hydrocarbons by Method MADEPV
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Unadjusted C5-C8 Aliphatics ND 100 1 10/04/2022 18:42 WG1936695
Unadjusted C9-C12 Aliphatics 514 100 1 10/04/2022 18:42 WG1936695
Unadjusted C9-C10 Aromatics ND 100 1 10/06/2022 05:00 WG1937847
Total VPH 514 100 1 10/06/2022 05:00 WG1937847
(S) 2,5-Dibromotoluene(FID)91.8 70.0-130 10/04/2022 18:42 WG1936695
(S) 2,5-Dibromotoluene(FID)93.6 70.0-130 10/06/2022 05:00 WG1937847
(S) 2,5-Dibromotoluene(PID)91.4 70.0-130 10/04/2022 18:42 WG1936695
(S) 2,5-Dibromotoluene(PID)96.5 70.0-130 10/06/2022 05:00 WG1937847
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Acetone ND J4 50.0 1 10/06/2022 14:46 WG1938382
Acrolein ND 50.0 1 10/06/2022 14:46 WG1938382
Acrylonitrile ND 10.0 1 10/06/2022 14:46 WG1938382
Benzene ND 1.00 1 10/06/2022 14:46 WG1938382
Bromobenzene ND 1.00 1 10/06/2022 14:46 WG1938382
Bromodichloromethane ND 1.00 1 10/06/2022 14:46 WG1938382
Bromoform ND 1.00 1 10/06/2022 14:46 WG1938382
Bromomethane ND 5.00 1 10/06/2022 14:46 WG1938382
n-Butylbenzene ND 1.00 1 10/06/2022 14:46 WG1938382
sec-Butylbenzene ND 1.00 1 10/06/2022 14:46 WG1938382
tert-Butylbenzene ND 1.00 1 10/06/2022 14:46 WG1938382
Carbon tetrachloride ND 1.00 1 10/06/2022 14:46 WG1938382
Chlorobenzene ND 1.00 1 10/06/2022 14:46 WG1938382
Chlorodibromomethane ND 1.00 1 10/06/2022 14:46 WG1938382
Chloroethane ND 5.00 1 10/06/2022 14:46 WG1938382
Chloroform ND 5.00 1 10/06/2022 14:46 WG1938382
Chloromethane ND 2.50 1 10/06/2022 14:46 WG1938382
2-Chlorotoluene ND 1.00 1 10/06/2022 14:46 WG1938382
4-Chlorotoluene ND 1.00 1 10/06/2022 14:46 WG1938382
1,2-Dibromo-3-Chloropropane ND 5.00 1 10/06/2022 14:46 WG1938382
1,2-Dibromoethane ND 1.00 1 10/06/2022 14:46 WG1938382
Dibromomethane ND 1.00 1 10/06/2022 14:46 WG1938382
1,2-Dichlorobenzene ND 1.00 1 10/06/2022 14:46 WG1938382
1,3-Dichlorobenzene ND 1.00 1 10/06/2022 14:46 WG1938382
1,4-Dichlorobenzene ND 1.00 1 10/06/2022 14:46 WG1938382
Dichlorodifluoromethane ND 5.00 1 10/06/2022 14:46 WG1938382
1,1-Dichloroethane ND 1.00 1 10/06/2022 14:46 WG1938382
1,2-Dichloroethane ND 1.00 1 10/06/2022 14:46 WG1938382
1,1-Dichloroethene ND 1.00 1 10/06/2022 14:46 WG1938382
cis-1,2-Dichloroethene ND 1.00 1 10/06/2022 14:46 WG1938382
trans-1,2-Dichloroethene ND 1.00 1 10/06/2022 14:46 WG1938382
1,2-Dichloropropane ND 1.00 1 10/06/2022 14:46 WG1938382
1,1-Dichloropropene ND 1.00 1 10/06/2022 14:46 WG1938382
1,3-Dichloropropane ND 1.00 1 10/06/2022 14:46 WG1938382
2,2-Dichloropropane ND 1.00 1 10/06/2022 14:46 WG1938382
Di-isopropyl ether ND 1.00 1 10/06/2022 14:46 WG1938382
Ethylbenzene ND 1.00 1 10/06/2022 14:46 WG1938382
Hexachloro-1,3-butadiene ND 1.00 1 10/06/2022 14:46 WG1938382
Isopropylbenzene ND 1.00 1 10/06/2022 14:46 WG1938382
p-Isopropyltoluene ND 1.00 1 10/06/2022 14:46 WG1938382
2-Butanone (MEK)ND 10.0 1 10/06/2022 14:46 WG1938382
Methylene Chloride ND 5.00 1 10/06/2022 14:46 WG1938382
4-Methyl-2-pentanone (MIBK)ND 10.0 1 10/06/2022 14:46 WG1938382
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 09:32 24 of 47
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
Terracon - Greensboro, NC 75207132 L1540642 10/13/22 10:04 24 of 47
SAMPLE RESULTS - 07
L1540642
FB-1
Collected date/time: 09/26/22 16:30
Volatile Organic Compounds (GC/MS) by Method 6200B-2011
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Methyl tert-butyl ether ND 1.00 1 10/06/2022 14:46 WG1938382
Naphthalene ND 5.00 1 10/06/2022 14:46 WG1938382
n-Propylbenzene ND 1.00 1 10/06/2022 14:46 WG1938382
Styrene ND 1.00 1 10/06/2022 14:46 WG1938382
1,1,1,2-Tetrachloroethane ND 1.00 1 10/06/2022 14:46 WG1938382
1,1,2,2-Tetrachloroethane ND 1.00 1 10/06/2022 14:46 WG1938382
Tetrachloroethene ND 1.00 1 10/06/2022 14:46 WG1938382
Toluene ND 1.00 1 10/06/2022 14:46 WG1938382
1,2,3-Trichlorobenzene ND Q 1.00 1 10/11/2022 04:58 WG1940230
1,2,4-Trichlorobenzene ND 1.00 1 10/06/2022 14:46 WG1938382
1,1,1-Trichloroethane ND 1.00 1 10/06/2022 14:46 WG1938382
1,1,2-Trichloroethane ND 1.00 1 10/06/2022 14:46 WG1938382
Trichloroethene ND 1.00 1 10/06/2022 14:46 WG1938382
Trichlorofluoromethane ND 5.00 1 10/06/2022 14:46 WG1938382
1,2,3-Trichloropropane ND 2.50 1 10/06/2022 14:46 WG1938382
1,2,4-Trimethylbenzene ND 1.00 1 10/06/2022 14:46 WG1938382
1,3,5-Trimethylbenzene ND 1.00 1 10/06/2022 14:46 WG1938382
Vinyl chloride ND 1.00 1 10/06/2022 14:46 WG1938382
o-Xylene ND 1.00 1 10/06/2022 14:46 WG1938382
m&p-Xylenes ND 2.00 1 10/06/2022 14:46 WG1938382
(S) Toluene-d8 108 80.0-120 10/06/2022 14:46 WG1938382
(S) Toluene-d8 103 80.0-120 10/11/2022 04:58 WG1940230
(S) 4-Bromofluorobenzene 92.2 77.0-126 10/06/2022 14:46 WG1938382
(S) 4-Bromofluorobenzene 99.7 77.0-126 10/11/2022 04:58 WG1940230
(S) 1,2-Dichloroethane-d4 125 70.0-130 10/06/2022 14:46 WG1938382
(S) 1,2-Dichloroethane-d4 91.3 70.0-130 10/11/2022 04:58 WG1940230
Sample Narrative:
L1540642-07 WG1940230: 1,2,3-TCB re-analyzed out of hold due to failing QC in initial in hold run
TPH by Method MADEPE
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Unadjusted C9-C18 Aliphatics ND 100 1 10/06/2022 18:55 WG1937846
Unadjusted C19-C36 Aliphatics ND 100 1 10/06/2022 18:55 WG1937846
Unadjusted C11-C22 Aromatics ND 100 1 10/06/2022 22:36 WG1937846
Unadjusted Total Petroleum
Hydrocarbons ND 100 1 10/06/2022 18:55 WG1937846
(S) o-Terphenyl 83.3 40.0-140 10/06/2022 22:36 WG1937846
(S) 1-Chloro-octadecane 71.2 40.0-140 10/06/2022 18:55 WG1937846
(S) 2-Fluorobiphenyl 86.3 40.0-140 10/06/2022 22:36 WG1937846
(S) 2-Bromonaphthalene 85.1 40.0-140 10/06/2022 22:36 WG1937846
Semi Volatile Organic Compounds (GC/MS) by Method 625.1
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Acenaphthene ND 1.00 1 10/03/2022 18:23 WG1935556
Acenaphthylene ND 1.00 1 10/03/2022 18:23 WG1935556
Anthracene ND 1.00 1 10/03/2022 18:23 WG1935556
Benzidine ND 10.0 1 10/03/2022 18:23 WG1935556
Benzo(a)anthracene ND 1.00 1 10/03/2022 18:23 WG1935556
Benzo(b)fluoranthene ND 1.00 1 10/03/2022 18:23 WG1935556
Benzo(k)fluoranthene ND 1.00 1 10/03/2022 18:23 WG1935556
Benzo(g,h,i)perylene ND 1.00 1 10/03/2022 18:23 WG1935556
Benzo(a)pyrene ND 1.00 1 10/03/2022 18:23 WG1935556
Bis(2-chlorethoxy)methane ND 10.0 1 10/03/2022 18:23 WG1935556
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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SAMPLE RESULTS - 07
L1540642
FB-1
Collected date/time: 09/26/22 16:30
Semi Volatile Organic Compounds (GC/MS) by Method 625.1
Result Qualifier RDL Dilution Analysis Batch
Analyte ug/l ug/l date / time
Bis(2-chloroethyl)ether ND 10.0 1 10/03/2022 18:23 WG1935556
2,2-Oxybis(1-Chloropropane)ND 10.0 1 10/03/2022 18:23 WG1935556
4-Bromophenyl-phenylether ND 10.0 1 10/03/2022 18:23 WG1935556
2-Chloronaphthalene ND 1.00 1 10/03/2022 18:23 WG1935556
4-Chlorophenyl-phenylether ND 10.0 1 10/03/2022 18:23 WG1935556
Chrysene ND 1.00 1 10/03/2022 18:23 WG1935556
Dibenz(a,h)anthracene ND 1.00 1 10/03/2022 18:23 WG1935556
3,3-Dichlorobenzidine ND 10.0 1 10/03/2022 18:23 WG1935556
2,4-Dinitrotoluene ND 10.0 1 10/03/2022 18:23 WG1935556
2,6-Dinitrotoluene ND 10.0 1 10/03/2022 18:23 WG1935556
Fluoranthene ND 1.00 1 10/03/2022 18:23 WG1935556
Fluorene ND 1.00 1 10/03/2022 18:23 WG1935556
Hexachlorobenzene ND 1.00 1 10/03/2022 18:23 WG1935556
Hexachloro-1,3-butadiene ND 10.0 1 10/03/2022 18:23 WG1935556
Hexachlorocyclopentadiene ND 10.0 1 10/03/2022 18:23 WG1935556
Hexachloroethane ND 10.0 1 10/03/2022 18:23 WG1935556
Indeno(1,2,3-cd)pyrene ND 1.00 1 10/03/2022 18:23 WG1935556
Isophorone ND 10.0 1 10/03/2022 18:23 WG1935556
Naphthalene ND 1.00 1 10/03/2022 18:23 WG1935556
Nitrobenzene ND 10.0 1 10/03/2022 18:23 WG1935556
n-Nitrosodimethylamine ND 10.0 1 10/03/2022 18:23 WG1935556
n-Nitrosodiphenylamine ND 10.0 1 10/03/2022 18:23 WG1935556
n-Nitrosodi-n-propylamine ND 10.0 1 10/03/2022 18:23 WG1935556
Phenanthrene ND 1.00 1 10/03/2022 18:23 WG1935556
Benzylbutyl phthalate ND 3.00 1 10/03/2022 18:23 WG1935556
Bis(2-ethylhexyl)phthalate ND 3.00 1 10/03/2022 18:23 WG1935556
Di-n-butyl phthalate ND 3.00 1 10/03/2022 18:23 WG1935556
Diethyl phthalate ND 3.00 1 10/03/2022 18:23 WG1935556
Dimethyl phthalate ND 3.00 1 10/03/2022 18:23 WG1935556
Di-n-octyl phthalate ND 3.00 1 10/03/2022 18:23 WG1935556
Pyrene ND 1.00 1 10/03/2022 18:23 WG1935556
1,2,4-Trichlorobenzene ND 10.0 1 10/03/2022 18:23 WG1935556
4-Chloro-3-methylphenol ND 10.0 1 10/03/2022 18:23 WG1935556
2-Chlorophenol ND 10.0 1 10/03/2022 18:23 WG1935556
2,4-Dichlorophenol ND 10.0 1 10/03/2022 18:23 WG1935556
2,4-Dimethylphenol ND 10.0 1 10/03/2022 18:23 WG1935556
4,6-Dinitro-2-methylphenol ND 10.0 1 10/03/2022 18:23 WG1935556
2,4-Dinitrophenol ND 10.0 1 10/03/2022 18:23 WG1935556
2-Nitrophenol ND 10.0 1 10/03/2022 18:23 WG1935556
4-Nitrophenol ND 10.0 1 10/03/2022 18:23 WG1935556
Pentachlorophenol ND 10.0 1 10/03/2022 18:23 WG1935556
Phenol ND 10.0 1 10/03/2022 18:23 WG1935556
2,4,6-Trichlorophenol ND 10.0 1 10/03/2022 18:23 WG1935556
(S) 2-Fluorophenol 31.9 10.0-120 10/03/2022 18:23 WG1935556
(S) Phenol-d5 21.7 8.00-424 10/03/2022 18:23 WG1935556
(S) Nitrobenzene-d5 71.4 15.0-314 10/03/2022 18:23 WG1935556
(S) 2-Fluorobiphenyl 57.9 22.0-127 10/03/2022 18:23 WG1935556
(S) 2,4,6-Tribromophenol 51.8 10.0-153 10/03/2022 18:23 WG1935556
(S) p-Terphenyl-d14 64.2 29.0-141 10/03/2022 18:23 WG1935556
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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SAMPLE RESULTS - 07
L1540642
FB-1
Collected date/time: 09/26/22 16:30
Semi Volatile Organic Compounds (GC/MS) by Method 625.1 - TENTATIVELY IDENTIFIED COMPOUNDS
Result Qualifier RDL Dilution Analysis Batch CAS #RT
Analyte ug/l ug/l date / time
Unknown-02 10.1 J N 0.000 1 10/03/2022 18:23 WG1935556 000565-75-3 2.03
Unknown-01 9.82 J N 0.000 1 10/03/2022 18:23 WG1935556 001576-87-0 1.92
Tentatively Identified compounds (TIC) refers to substances not present in the list of target compounds. Therefore, not all TICs are identified and quantitated using individual standards. TIC
listings are prepared utilizing a computerized library search routine of electron impact mass spectral data and evaluation of the relevant data by a mass spectral data specialist. Quantitation is
accomplished by relative peak area of the TIC compared to that of the nearest internal standard from the total ion chromatogram. TICs are identified and quantitated only if the peak area is
10% or more of that of the nearest internal standard.
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG1936695
Volatile Petroleum Hydrocarbons by Method MADEPV L1540642-04,05,06,07
Method Blank (MB)
(MB) R3844583-3 10/04/22 08:17
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
Unadjusted C5-C8 Aliphatics U 33.3 100
Unadjusted C9-C12 Aliphatics U 33.3 100
Unadjusted C9-C10 Aromatics U 33.3 100
Total VPH U 33.3 100
(S) 2,5-Dibromotoluene(FID)96.6 70.0-130
(S) 2,5-Dibromotoluene(PID)101 70.0-130
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R3844583-1 10/04/22 06:06 • (LCSD) R3844583-2 10/04/22 06:39
Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l %%%%%
Unadjusted C5-C8 Aliphatics 1200 1130 1150 94.2 95.8 70.0-130 1.75 25
Unadjusted C9-C12 Aliphatics 1400 1340 1370 95.7 97.9 70.0-130 2.21 25
Unadjusted C9-C10 Aromatics 200 206 205 103 103 70.0-130 0.487 25
Total VPH 2800 2680 2730 95.7 97.5 70.0-130 1.85 25
(S) 2,5-Dibromotoluene(FID) 98.9 96.7 70.0-130
(S) 2,5-Dibromotoluene(PID) 97.2 95.5 70.0-130
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG1937847
Volatile Petroleum Hydrocarbons by Method MADEPV L1540642-06,07
Method Blank (MB)
(MB) R3845247-3 10/05/22 15:18
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
Unadjusted C9-C10 Aromatics U 33.3 100
Total VPH U 33.3 100
(S) 2,5-Dibromotoluene(FID)91.9 70.0-130
(S) 2,5-Dibromotoluene(PID)97.4 70.0-130
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R3845247-1 10/05/22 13:07 • (LCSD) R3845247-2 10/05/22 13:40
Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l %%%%%
Unadjusted C9-C10 Aromatics 200 193 193 96.5 96.5 70.0-130 0.000 25
Total VPH 2800 2460 2420 87.9 86.4 70.0-130 1.64 25
(S) 2,5-Dibromotoluene(FID) 91.7 93.3 70.0-130
(S) 2,5-Dibromotoluene(PID) 91.3 94.3 70.0-130
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG1938382
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1540642-01,03,04,05,06,07
Method Blank (MB)
(MB) R3846578-3 10/06/22 09:14
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
Acetone U 11.3 50.0
Acrolein U 2.54 50.0
Acrylonitrile U 0.671 10.0
Benzene U 0.0941 1.00
Bromobenzene U 0.118 1.00
Bromodichloromethane U 0.136 1.00
Bromoform U 0.129 1.00
Bromomethane U 0.605 5.00
n-Butylbenzene U 0.157 1.00
sec-Butylbenzene U 0.125 1.00
tert-Butylbenzene U 0.127 1.00
Carbon tetrachloride U 0.128 1.00
Chlorobenzene U 0.116 1.00
Chlorodibromomethane U 0.140 1.00
Chloroethane U 0.192 5.00
Chloroform U 0.111 5.00
Chloromethane U 0.960 2.50
2-Chlorotoluene U 0.106 1.00
4-Chlorotoluene U 0.114 1.00
1,2-Dibromo-3-Chloropropane U 0.276 5.00
1,2-Dibromoethane U 0.126 1.00
Dibromomethane U 0.122 1.00
1,2-Dichlorobenzene U 0.107 1.00
1,3-Dichlorobenzene U 0.110 1.00
1,4-Dichlorobenzene U 0.120 1.00
Dichlorodifluoromethane U 0.374 5.00
1,1-Dichloroethane U 0.100 1.00
1,2-Dichloroethane U 0.0819 1.00
1,1-Dichloroethene U 0.188 1.00
cis-1,2-Dichloroethene U 0.126 1.00
trans-1,2-Dichloroethene U 0.149 1.00
1,2-Dichloropropane U 0.149 1.00
1,1-Dichloropropene U 0.142 1.00
1,3-Dichloropropane U 0.110 1.00
2,2-Dichloropropane U 0.161 1.00
Di-isopropyl ether U 0.105 1.00
Ethylbenzene U 0.137 1.00
Hexachloro-1,3-butadiene U 0.337 1.00
Isopropylbenzene U 0.105 1.00
p-Isopropyltoluene U 0.120 1.00
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG1938382
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1540642-01,03,04,05,06,07
Method Blank (MB)
(MB) R3846578-3 10/06/22 09:14
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
2-Butanone (MEK)U 1.19 10.0
Methylene Chloride U 0.430 5.00
4-Methyl-2-pentanone (MIBK)U 0.478 10.0
Methyl tert-butyl ether U 0.101 1.00
Naphthalene U 1.00 5.00
n-Propylbenzene U 0.0993 1.00
Styrene U 0.118 1.00
1,1,1,2-Tetrachloroethane U 0.147 1.00
1,1,2,2-Tetrachloroethane U 0.133 1.00
Tetrachloroethene U 0.300 1.00
Toluene U 0.278 1.00
1,2,4-Trichlorobenzene U 0.481 1.00
1,1,1-Trichloroethane U 0.149 1.00
1,1,2-Trichloroethane U 0.158 1.00
Trichloroethene U 0.190 1.00
Trichlorofluoromethane U 0.160 5.00
1,2,3-Trichloropropane U 0.237 2.50
1,2,4-Trimethylbenzene U 0.322 1.00
1,3,5-Trimethylbenzene U 0.104 1.00
Vinyl chloride U 0.234 1.00
o-Xylene U 0.174 1.00
m&p-Xylenes U 0.430 2.00
(S) Toluene-d8 111 80.0-120
(S) 4-Bromofluorobenzene 94.9 77.0-126
(S) 1,2-Dichloroethane-d4 126 70.0-130
Laboratory Control Sample (LCS)
(LCS) R3846578-1 10/06/22 08:13
Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier
Analyte ug/l ug/l %%
Acetone 25.0 42.5 170 19.0-160 J4
Acrolein 25.0 35.0 140 10.0-160
Acrylonitrile 25.0 34.9 140 55.0-149
Benzene 5.00 4.41 88.2 70.0-123
Bromobenzene 5.00 3.96 79.2 73.0-121
Bromodichloromethane 5.00 4.22 84.4 75.0-120
Bromoform 5.00 3.70 74.0 68.0-132
Bromomethane 5.00 4.15 83.0 10.0-160
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG1938382
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1540642-01,03,04,05,06,07
Laboratory Control Sample (LCS)
(LCS) R3846578-1 10/06/22 08:13
Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier
Analyte ug/l ug/l %%
n-Butylbenzene 5.00 4.35 87.0 73.0-125
sec-Butylbenzene 5.00 3.82 76.4 75.0-125
tert-Butylbenzene 5.00 3.85 77.0 76.0-124
Carbon tetrachloride 5.00 4.20 84.0 68.0-126
Chlorobenzene 5.00 4.35 87.0 80.0-121
Chlorodibromomethane 5.00 4.00 80.0 77.0-125
Chloroethane 5.00 5.73 115 47.0-150
Chloroform 5.00 4.42 88.4 73.0-120
Chloromethane 5.00 5.53 111 41.0-142
2-Chlorotoluene 5.00 3.95 79.0 76.0-123
4-Chlorotoluene 5.00 3.92 78.4 75.0-122
1,2-Dibromo-3-Chloropropane 5.00 4.06 81.2 58.0-134
1,2-Dibromoethane 5.00 4.31 86.2 80.0-122
Dibromomethane 5.00 4.50 90.0 80.0-120
1,2-Dichlorobenzene 5.00 4.45 89.0 79.0-121
1,3-Dichlorobenzene 5.00 4.27 85.4 79.0-120
1,4-Dichlorobenzene 5.00 4.43 88.6 79.0-120
Dichlorodifluoromethane 5.00 3.49 69.8 51.0-149
1,1-Dichloroethane 5.00 5.19 104 70.0-126
1,2-Dichloroethane 5.00 5.35 107 70.0-128
1,1-Dichloroethene 5.00 4.03 80.6 71.0-124
cis-1,2-Dichloroethene 5.00 4.25 85.0 73.0-120
trans-1,2-Dichloroethene 5.00 4.28 85.6 73.0-120
1,2-Dichloropropane 5.00 5.53 111 77.0-125
1,1-Dichloropropene 5.00 4.36 87.2 74.0-126
1,3-Dichloropropane 5.00 4.48 89.6 80.0-120
2,2-Dichloropropane 5.00 4.18 83.6 58.0-130
Di-isopropyl ether 5.00 5.64 113 58.0-138
Ethylbenzene 5.00 4.11 82.2 79.0-123
Hexachloro-1,3-butadiene 5.00 3.84 76.8 54.0-138
Isopropylbenzene 5.00 4.19 83.8 76.0-127
p-Isopropyltoluene 5.00 3.88 77.6 76.0-125
2-Butanone (MEK)25.0 32.0 128 44.0-160
Methylene Chloride 5.00 4.44 88.8 67.0-120
4-Methyl-2-pentanone (MIBK)25.0 30.4 122 68.0-142
Methyl tert-butyl ether 5.00 4.72 94.4 68.0-125
Naphthalene 5.00 3.96 79.2 54.0-135
n-Propylbenzene 5.00 3.88 77.6 77.0-124
Styrene 5.00 3.78 75.6 73.0-130
1,1,1,2-Tetrachloroethane 5.00 4.37 87.4 75.0-125
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG1938382
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1540642-01,03,04,05,06,07
Laboratory Control Sample (LCS)
(LCS) R3846578-1 10/06/22 08:13
Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier
Analyte ug/l ug/l %%
1,1,2,2-Tetrachloroethane 5.00 3.94 78.8 65.0-130
Tetrachloroethene 5.00 4.19 83.8 72.0-132
Toluene 5.00 4.23 84.6 79.0-120
1,2,4-Trichlorobenzene 5.00 3.74 74.8 57.0-137
1,1,1-Trichloroethane 5.00 4.31 86.2 73.0-124
1,1,2-Trichloroethane 5.00 4.26 85.2 80.0-120
Trichloroethene 5.00 4.50 90.0 78.0-124
Trichlorofluoromethane 5.00 4.24 84.8 59.0-147
1,2,3-Trichloropropane 5.00 4.22 84.4 73.0-130
1,2,4-Trimethylbenzene 5.00 3.90 78.0 76.0-121
1,3,5-Trimethylbenzene 5.00 3.85 77.0 76.0-122
Vinyl chloride 5.00 5.27 105 67.0-131
o-Xylene 5.00 4.18 83.6 80.0-122
m&p-Xylenes 10.0 8.53 85.3 80.0-122
(S) Toluene-d8 108 80.0-120
(S) 4-Bromofluorobenzene 97.5 77.0-126
(S) 1,2-Dichloroethane-d4 130 70.0-130
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG1940230
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1540642-01,02,03,04,05,06,07
Method Blank (MB)
(MB) R3847115-2 10/11/22 03:28
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
Acetone U 11.3 50.0
Acrolein U 2.54 50.0
Acrylonitrile U 0.671 10.0
Benzene U 0.0941 1.00
Bromobenzene U 0.118 1.00
Bromodichloromethane U 0.136 1.00
Bromoform U 0.129 1.00
Bromomethane U 0.605 5.00
n-Butylbenzene U 0.157 1.00
sec-Butylbenzene U 0.125 1.00
tert-Butylbenzene U 0.127 1.00
Carbon tetrachloride U 0.128 1.00
Chlorobenzene U 0.116 1.00
Chlorodibromomethane U 0.140 1.00
Chloroethane U 0.192 5.00
Chloroform U 0.111 5.00
Chloromethane U 0.960 2.50
2-Chlorotoluene U 0.106 1.00
4-Chlorotoluene U 0.114 1.00
1,2-Dibromo-3-Chloropropane U 0.276 5.00
1,2-Dibromoethane U 0.126 1.00
Dibromomethane U 0.122 1.00
1,2-Dichlorobenzene U 0.107 1.00
1,3-Dichlorobenzene U 0.110 1.00
1,4-Dichlorobenzene U 0.120 1.00
Dichlorodifluoromethane U 0.374 5.00
1,1-Dichloroethane U 0.100 1.00
1,2-Dichloroethane U 0.0819 1.00
1,1-Dichloroethene U 0.188 1.00
cis-1,2-Dichloroethene U 0.126 1.00
trans-1,2-Dichloroethene U 0.149 1.00
1,2-Dichloropropane U 0.149 1.00
1,1-Dichloropropene U 0.142 1.00
1,3-Dichloropropane U 0.110 1.00
2,2-Dichloropropane U 0.161 1.00
Di-isopropyl ether U 0.105 1.00
Ethylbenzene U 0.137 1.00
Hexachloro-1,3-butadiene U 0.337 1.00
Isopropylbenzene U 0.105 1.00
p-Isopropyltoluene U 0.120 1.00
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG1940230
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1540642-01,02,03,04,05,06,07
Method Blank (MB)
(MB) R3847115-2 10/11/22 03:28
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
2-Butanone (MEK)U 1.19 10.0
Methylene Chloride U 0.430 5.00
4-Methyl-2-pentanone (MIBK)U 0.478 10.0
Methyl tert-butyl ether U 0.101 1.00
Naphthalene U 1.00 5.00
n-Propylbenzene U 0.0993 1.00
Styrene U 0.118 1.00
1,1,1,2-Tetrachloroethane U 0.147 1.00
1,1,2,2-Tetrachloroethane U 0.133 1.00
Tetrachloroethene U 0.300 1.00
Toluene U 0.278 1.00
1,2,3-Trichlorobenzene U 0.230 1.00
1,2,4-Trichlorobenzene U 0.481 1.00
1,1,1-Trichloroethane U 0.149 1.00
1,1,2-Trichloroethane U 0.158 1.00
Trichloroethene U 0.190 1.00
Trichlorofluoromethane U 0.160 5.00
1,2,3-Trichloropropane U 0.237 2.50
1,2,4-Trimethylbenzene U 0.322 1.00
1,3,5-Trimethylbenzene U 0.104 1.00
Vinyl chloride U 0.234 1.00
o-Xylene U 0.174 1.00
m&p-Xylenes U 0.430 2.00
(S) Toluene-d8 105 80.0-120
(S) 4-Bromofluorobenzene 104 77.0-126
(S) 1,2-Dichloroethane-d4 90.3 70.0-130
Laboratory Control Sample (LCS)
(LCS) R3847115-1 10/11/22 02:28
Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier
Analyte ug/l ug/l %%
Acetone 25.0 25.4 102 19.0-160
Acrolein 25.0 14.9 59.6 10.0-160
Acrylonitrile 25.0 24.2 96.8 55.0-149
Benzene 5.00 4.85 97.0 70.0-123
Bromobenzene 5.00 4.63 92.6 73.0-121
Bromodichloromethane 5.00 4.61 92.2 75.0-120
Bromoform 5.00 4.21 84.2 68.0-132
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG1940230
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1540642-01,02,03,04,05,06,07
Laboratory Control Sample (LCS)
(LCS) R3847115-1 10/11/22 02:28
Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier
Analyte ug/l ug/l %%
Bromomethane 5.00 3.66 73.2 10.0-160
n-Butylbenzene 5.00 4.68 93.6 73.0-125
sec-Butylbenzene 5.00 5.03 101 75.0-125
tert-Butylbenzene 5.00 5.31 106 76.0-124
Carbon tetrachloride 5.00 4.70 94.0 68.0-126
Chlorobenzene 5.00 5.05 101 80.0-121
Chlorodibromomethane 5.00 4.70 94.0 77.0-125
Chloroethane 5.00 5.13 103 47.0-150
Chloroform 5.00 4.90 98.0 73.0-120
Chloromethane 5.00 4.19 83.8 41.0-142
2-Chlorotoluene 5.00 4.71 94.2 76.0-123
4-Chlorotoluene 5.00 4.72 94.4 75.0-122
1,2-Dibromo-3-Chloropropane 5.00 4.26 85.2 58.0-134
1,2-Dibromoethane 5.00 4.76 95.2 80.0-122
Dibromomethane 5.00 4.70 94.0 80.0-120
1,2-Dichlorobenzene 5.00 4.56 91.2 79.0-121
1,3-Dichlorobenzene 5.00 4.52 90.4 79.0-120
1,4-Dichlorobenzene 5.00 4.73 94.6 79.0-120
Dichlorodifluoromethane 5.00 5.63 113 51.0-149
1,1-Dichloroethane 5.00 4.90 98.0 70.0-126
1,2-Dichloroethane 5.00 4.55 91.0 70.0-128
1,1-Dichloroethene 5.00 5.30 106 71.0-124
cis-1,2-Dichloroethene 5.00 5.04 101 73.0-120
trans-1,2-Dichloroethene 5.00 4.91 98.2 73.0-120
1,2-Dichloropropane 5.00 4.34 86.8 77.0-125
1,1-Dichloropropene 5.00 4.83 96.6 74.0-126
1,3-Dichloropropane 5.00 4.88 97.6 80.0-120
2,2-Dichloropropane 5.00 4.41 88.2 58.0-130
Di-isopropyl ether 5.00 4.60 92.0 58.0-138
Ethylbenzene 5.00 4.97 99.4 79.0-123
Hexachloro-1,3-butadiene 5.00 4.88 97.6 54.0-138
Isopropylbenzene 5.00 4.98 99.6 76.0-127
p-Isopropyltoluene 5.00 4.91 98.2 76.0-125
2-Butanone (MEK)25.0 25.3 101 44.0-160
Methylene Chloride 5.00 5.47 109 67.0-120
4-Methyl-2-pentanone (MIBK)25.0 23.4 93.6 68.0-142
Methyl tert-butyl ether 5.00 4.70 94.0 68.0-125
Naphthalene 5.00 4.03 80.6 54.0-135
n-Propylbenzene 5.00 4.84 96.8 77.0-124
Styrene 5.00 4.61 92.2 73.0-130
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG1940230
Volatile Organic Compounds (GC/MS) by Method 6200B-2011 L1540642-01,02,03,04,05,06,07
Laboratory Control Sample (LCS)
(LCS) R3847115-1 10/11/22 02:28
Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier
Analyte ug/l ug/l %%
1,1,1,2-Tetrachloroethane 5.00 4.65 93.0 75.0-125
1,1,2,2-Tetrachloroethane 5.00 4.52 90.4 65.0-130
Tetrachloroethene 5.00 5.29 106 72.0-132
Toluene 5.00 5.00 100 79.0-120
1,2,3-Trichlorobenzene 5.00 4.42 88.4 50.0-138
1,2,4-Trichlorobenzene 5.00 4.82 96.4 57.0-137
1,1,1-Trichloroethane 5.00 5.09 102 73.0-124
1,1,2-Trichloroethane 5.00 4.87 97.4 80.0-120
Trichloroethene 5.00 4.97 99.4 78.0-124
Trichlorofluoromethane 5.00 5.55 111 59.0-147
1,2,3-Trichloropropane 5.00 4.80 96.0 73.0-130
1,2,4-Trimethylbenzene 5.00 4.69 93.8 76.0-121
1,3,5-Trimethylbenzene 5.00 4.63 92.6 76.0-122
Vinyl chloride 5.00 5.45 109 67.0-131
o-Xylene 5.00 4.78 95.6 80.0-122
m&p-Xylenes 10.0 9.91 99.1 80.0-122
(S) Toluene-d8 104 80.0-120
(S) 4-Bromofluorobenzene 100 77.0-126
(S) 1,2-Dichloroethane-d4 92.1 70.0-130
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG1937846
TPH by Method MADEPE L1540642-04,05,06,07
Method Blank (MB)
(MB) R3845828-1 10/06/22 13:05
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
Unadjusted C9-C18 Aliphatics U 33.3 100
Unadjusted C19-C36 Aliphatics U 33.3 100
(S) 1-Chloro-octadecane 77.0 40.0-140
Method Blank (MB)
(MB) R3845828-4 10/06/22 14:23
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
Unadjusted C11-C22 Aromatics U 33.3 100
(S) o-Terphenyl 77.0 40.0-140
(S) 2-Fluorobiphenyl 76.5 40.0-140
(S) 2-Bromonaphthalene 74.0 40.0-140
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R3845828-2 10/06/22 13:29 • (LCSD) R3845828-3 10/06/22 13:55
Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l %%%%%
Unadjusted C9-C18 Aliphatics 600 374 384 62.3 64.0 40.0-140 2.64 25
Unadjusted C19-C36 Aliphatics 800 661 673 82.6 84.1 40.0-140 1.80 25
(S) 1-Chloro-octadecane 75.5 77.8 40.0-140
Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD)
(LCS) R3845828-5 10/06/22 14:49 • (LCSD) R3845828-6 10/06/22 15:17
Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l %%%%%
Unadjusted C11-C22 Aromatics 1700 1240 1330 72.9 78.2 40.0-140 7.00 25
(S) o-Terphenyl 80.7 82.2 40.0-140
(S) 2-Fluorobiphenyl 82.4 87.5 40.0-140
(S) 2-Bromonaphthalene 80.4 86.6 40.0-140
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG1935556
Semi Volatile Organic Compounds (GC/MS) by Method 625.1 L1540642-04,05,06,07
Method Blank (MB)
(MB) R3844355-2 10/04/22 09:49
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
Acenaphthene U 0.0886 1.00
Acenaphthylene U 0.0921 1.00
Anthracene U 0.0804 1.00
Benzidine U 3.74 10.0
Benzo(a)anthracene U 0.199 1.00
Benzo(b)fluoranthene U 0.130 1.00
Benzo(k)fluoranthene U 0.120 1.00
Benzo(g,h,i)perylene U 0.121 1.00
Benzo(a)pyrene U 0.0381 1.00
Bis(2-chlorethoxy)methane U 0.116 10.0
Bis(2-chloroethyl)ether U 0.137 10.0
2,2-Oxybis(1-Chloropropane)U 0.210 10.0
4-Bromophenyl-phenylether U 0.0877 10.0
2-Chloronaphthalene U 0.0648 1.00
4-Chlorophenyl-phenylether U 0.0926 10.0
Chrysene U 0.130 1.00
Dibenz(a,h)anthracene U 0.0644 1.00
3,3-Dichlorobenzidine U 0.212 10.0
2,4-Dinitrotoluene U 0.0983 10.0
2,6-Dinitrotoluene U 0.250 10.0
Fluoranthene U 0.102 1.00
Fluorene U 0.0844 1.00
Hexachlorobenzene U 0.0755 1.00
Hexachloro-1,3-butadiene U 0.0968 10.0
Hexachlorocyclopentadiene U 0.0598 10.0
Hexachloroethane U 0.127 10.0
Indeno(1,2,3-cd)pyrene U 0.279 1.00
Isophorone U 0.143 10.0
Naphthalene U 0.159 1.00
Nitrobenzene U 0.297 10.0
n-Nitrosodimethylamine U 0.998 10.0
n-Nitrosodiphenylamine U 2.37 10.0
n-Nitrosodi-n-propylamine U 0.261 10.0
Phenanthrene U 0.112 1.00
Benzylbutyl phthalate U 0.765 3.00
Bis(2-ethylhexyl)phthalate U 0.895 3.00
Di-n-butyl phthalate U 0.453 3.00
Diethyl phthalate U 0.287 3.00
Dimethyl phthalate U 0.260 3.00
Di-n-octyl phthalate U 0.932 3.00
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
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QUALITY CONTROL SUMMARYWG1935556
Semi Volatile Organic Compounds (GC/MS) by Method 625.1 L1540642-04,05,06,07
Method Blank (MB)
(MB) R3844355-2 10/04/22 09:49
MB Result MB Qualifier MB MDL MB RDL
Analyte ug/l ug/l ug/l
Pyrene U 0.107 1.00
1,2,4-Trichlorobenzene U 0.0698 10.0
4-Chloro-3-methylphenol U 0.131 10.0
2-Chlorophenol U 0.133 10.0
2,4-Dichlorophenol U 0.102 10.0
2,4-Dimethylphenol U 0.0636 10.0
4,6-Dinitro-2-methylphenol U 1.12 10.0
2,4-Dinitrophenol U 5.93 10.0
2-Nitrophenol U 0.117 10.0
4-Nitrophenol U 0.143 10.0
Pentachlorophenol U 0.313 10.0
Phenol U 4.33 10.0
2,4,6-Trichlorophenol U 0.100 10.0
(S) 2-Fluorophenol 35.1 10.0-120
(S) Phenol-d5 22.6 8.00-424
(S) Nitrobenzene-d5 68.1 15.0-314
(S) 2-Fluorobiphenyl 75.2 22.0-127
(S) 2,4,6-Tribromophenol 66.5 10.0-153
(S) p-Terphenyl-d14 63.9 29.0-141
Laboratory Control Sample (LCS)
(LCS) R3844355-1 10/04/22 09:28
Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier
Analyte ug/l ug/l %%
Acenaphthene 50.0 39.0 78.0 47.0-145
Acenaphthylene 50.0 40.7 81.4 33.0-145
Anthracene 50.0 41.5 83.0 27.0-133
Benzidine 100 29.4 29.4 1.00-120
Benzo(a)anthracene 50.0 42.3 84.6 33.0-143
Benzo(b)fluoranthene 50.0 42.4 84.8 24.0-159
Benzo(k)fluoranthene 50.0 43.1 86.2 11.0-162
Benzo(g,h,i)perylene 50.0 41.8 83.6 1.00-219
Benzo(a)pyrene 50.0 46.9 93.8 17.0-163
Bis(2-chlorethoxy)methane 50.0 34.1 68.2 1.00-219
Bis(2-chloroethyl)ether 50.0 36.5 73.0 33.0-185
2,2-Oxybis(1-Chloropropane)50.0 33.4 66.8 36.0-166
4-Bromophenyl-phenylether 50.0 41.7 83.4 53.0-127
2-Chloronaphthalene 50.0 38.2 76.4 60.0-120
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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QUALITY CONTROL SUMMARYWG1935556
Semi Volatile Organic Compounds (GC/MS) by Method 625.1 L1540642-04,05,06,07
Laboratory Control Sample (LCS)
(LCS) R3844355-1 10/04/22 09:28
Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier
Analyte ug/l ug/l %%
4-Chlorophenyl-phenylether 50.0 41.6 83.2 25.0-158
Chrysene 50.0 42.7 85.4 17.0-168
Dibenz(a,h)anthracene 50.0 41.8 83.6 1.00-227
3,3-Dichlorobenzidine 100 89.0 89.0 1.00-262
2,4-Dinitrotoluene 50.0 45.1 90.2 39.0-139
2,6-Dinitrotoluene 50.0 43.0 86.0 50.0-158
Fluoranthene 50.0 45.1 90.2 26.0-137
Fluorene 50.0 41.1 82.2 59.0-121
Hexachlorobenzene 50.0 38.3 76.6 1.00-152
Hexachloro-1,3-butadiene 50.0 33.4 66.8 24.0-120
Hexachlorocyclopentadiene 50.0 13.8 27.6 10.0-120
Hexachloroethane 50.0 33.2 66.4 40.0-120
Indeno(1,2,3-cd)pyrene 50.0 41.1 82.2 1.00-171
Isophorone 50.0 31.4 62.8 21.0-196
Naphthalene 50.0 31.3 62.6 21.0-133
Nitrobenzene 50.0 33.3 66.6 35.0-180
n-Nitrosodimethylamine 50.0 21.3 42.6 10.0-120
n-Nitrosodiphenylamine 50.0 38.8 77.6 44.0-120
n-Nitrosodi-n-propylamine 50.0 34.9 69.8 1.00-230
Phenanthrene 50.0 40.0 80.0 54.0-120
Benzylbutyl phthalate 50.0 42.0 84.0 1.00-152
Bis(2-ethylhexyl)phthalate 50.0 40.8 81.6 8.00-158
Di-n-butyl phthalate 50.0 44.8 89.6 1.00-120
Diethyl phthalate 50.0 42.4 84.8 1.00-120
Dimethyl phthalate 50.0 41.1 82.2 1.00-120
Di-n-octyl phthalate 50.0 40.1 80.2 4.00-146
Pyrene 50.0 40.6 81.2 52.0-120
1,2,4-Trichlorobenzene 50.0 33.4 66.8 44.0-142
4-Chloro-3-methylphenol 50.0 31.5 63.0 22.0-147
2-Chlorophenol 50.0 29.4 58.8 23.0-134
2,4-Dichlorophenol 50.0 34.1 68.2 39.0-135
2,4-Dimethylphenol 50.0 31.3 62.6 32.0-120
4,6-Dinitro-2-methylphenol 50.0 42.6 85.2 1.00-181
2,4-Dinitrophenol 50.0 38.8 77.6 1.00-191
2-Nitrophenol 50.0 34.8 69.6 29.0-182
4-Nitrophenol 50.0 15.4 30.8 1.00-132
Pentachlorophenol 50.0 38.8 77.6 14.0-176
Phenol 50.0 12.3 24.6 5.00-120
2,4,6-Trichlorophenol 50.0 39.7 79.4 37.0-144
(S) 2-Fluorophenol 33.7 10.0-120
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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QUALITY CONTROL SUMMARYWG1935556
Semi Volatile Organic Compounds (GC/MS) by Method 625.1 L1540642-04,05,06,07
Laboratory Control Sample (LCS)
(LCS) R3844355-1 10/04/22 09:28
Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier
Analyte ug/l ug/l %%
(S) Phenol-d5 21.9 8.00-424
(S) Nitrobenzene-d5 61.1 15.0-314
(S) 2-Fluorobiphenyl 70.9 22.0-127
(S) 2,4,6-Tribromophenol 71.5 10.0-153
(S) p-Terphenyl-d14 65.7 29.0-141
L1540401-01 Original Sample (OS) • Matrix Spike (MS) • Matrix Spike Duplicate (MSD)
(OS) L1540401-01 10/04/22 14:27 • (MS) R3844355-3 10/04/22 14:49 • (MSD) R3844355-4 10/04/22 15:10
Spike Amount Original Result MS Result MSD Result MS Rec.MSD Rec.Dilution Rec. Limits MS Qualifier MSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l ug/l %%%%%
Acenaphthene 47.6 ND 23.6 25.7 49.6 51.4 1 47.0-145 8.52 48
Acenaphthylene 47.6 ND 24.4 25.5 51.3 51.0 1 33.0-145 4.41 74
Anthracene 47.6 ND 24.1 26.8 50.6 53.6 1 27.0-133 10.6 66
Benzidine 95.2 ND ND ND 0.000 0.000 1 1.00-120 J6 J6 0.000 40
Benzo(a)anthracene 47.6 ND 21.2 23.8 44.5 47.6 1 33.0-143 11.6 53
Benzo(b)fluoranthene 47.6 ND 20.1 22.8 42.2 45.6 1 24.0-159 12.6 71
Benzo(k)fluoranthene 47.6 ND 19.4 23.0 40.8 46.0 1 11.0-162 17.0 63
Benzo(g,h,i)perylene 47.6 ND 19.2 22.7 40.3 45.4 1 1.00-219 16.7 97
Benzo(a)pyrene 47.6 ND 21.9 25.6 46.0 51.2 1 17.0-163 15.6 72
Bis(2-chlorethoxy)methane 47.6 ND 27.1 26.0 56.9 52.0 1 33.0-184 4.14 54
Bis(2-chloroethyl)ether 47.6 ND 28.8 27.0 60.5 54.0 1 12.0-158 6.45 108
2,2-Oxybis(1-Chloropropane)47.6 ND 23.5 23.2 49.4 46.4 1 36.0-166 1.28 76
4-Bromophenyl-phenylether 47.6 ND 24.4 27.0 51.3 54.0 1 53.0-127 J6 10.1 43
2-Chloronaphthalene 47.6 ND 23.3 24.1 48.9 48.2 1 60.0-120 J6 J6 3.38 24
4-Chlorophenyl-phenylether 47.6 ND 22.2 24.8 46.6 49.6 1 25.0-158 11.1 61
Chrysene 47.6 ND 20.9 23.5 43.9 47.0 1 17.0-168 11.7 87
Dibenz(a,h)anthracene 47.6 ND 19.4 22.8 40.8 45.6 1 1.00-227 16.1 126
3,3-Dichlorobenzidine 95.2 ND ND ND 0.000 3.64 1 1.00-262 J6 J3 200 108
2,4-Dinitrotoluene 47.6 ND 32.1 33.1 67.4 66.2 1 39.0-139 3.07 42
2,6-Dinitrotoluene 47.6 ND 30.0 30.0 63.0 60.0 1 50.0-158 0.000 48
Fluoranthene 47.6 ND 23.4 26.4 49.2 52.8 1 26.0-137 12.0 66
Fluorene 47.6 ND 25.8 27.9 54.2 55.8 1 59.0-121 J6 J6 7.82 38
Hexachlorobenzene 47.6 ND 20.2 22.8 42.4 45.6 1 1.00-152 12.1 55
Hexachloro-1,3-butadiene 47.6 ND 20.0 20.8 42.0 41.6 1 24.0-120 3.92 62
Hexachlorocyclopentadiene 47.6 ND ND ND 18.8 18.9 1 10.0-146 5.43 34
Hexachloroethane 47.6 ND 32.2 31.2 67.6 62.4 1 40.0-120 3.15 52
Indeno(1,2,3-cd)pyrene 47.6 ND 19.3 22.8 40.5 45.6 1 1.00-171 16.6 99
Isophorone 47.6 ND 25.7 24.9 54.0 49.8 1 21.0-196 3.16 93
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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QUALITY CONTROL SUMMARYWG1935556
Semi Volatile Organic Compounds (GC/MS) by Method 625.1 L1540642-04,05,06,07
L1540401-01 Original Sample (OS) • Matrix Spike (MS) • Matrix Spike Duplicate (MSD)
(OS) L1540401-01 10/04/22 14:27 • (MS) R3844355-3 10/04/22 14:49 • (MSD) R3844355-4 10/04/22 15:10
Spike Amount Original Result MS Result MSD Result MS Rec.MSD Rec.Dilution Rec. Limits MS Qualifier MSD Qualifier RPD RPD Limits
Analyte ug/l ug/l ug/l ug/l %%%%%
Naphthalene 47.6 ND 32.1 30.7 67.4 61.4 1 21.0-133 4.46 65
Nitrobenzene 47.6 ND 28.4 27.0 59.7 54.0 1 35.0-180 5.05 62
n-Nitrosodimethylamine 47.6 ND 15.7 15.3 33.0 30.6 1 10.0-120 2.58 40
n-Nitrosodiphenylamine 47.6 ND 30.6 35.4 64.3 70.8 1 16.0-160 14.5 28
n-Nitrosodi-n-propylamine 47.6 ND 27.8 26.8 58.4 53.6 1 1.00-230 3.66 87
Phenanthrene 47.6 ND 26.5 28.8 55.7 57.6 1 54.0-120 8.32 39
Benzylbutyl phthalate 47.6 ND 25.6 27.6 53.8 55.2 1 1.00-152 7.52 60
Bis(2-ethylhexyl)phthalate 47.6 3.83 21.4 24.1 36.9 40.5 1 8.00-158 11.9 82
Di-n-butyl phthalate 47.6 ND 24.7 27.3 51.9 54.6 1 1.00-120 10.0 47
Diethyl phthalate 47.6 ND 25.8 26.9 54.2 53.8 1 1.00-120 4.17 100
Dimethyl phthalate 47.6 ND 28.2 28.0 59.2 56.0 1 1.00-120 0.712 183
Di-n-octyl phthalate 47.6 ND 19.4 22.8 40.8 45.6 1 4.00-146 16.1 69
Pyrene 47.6 ND 23.1 24.7 48.0 48.9 1 52.0-120 J6 J6 6.69 49
1,2,4-Trichlorobenzene 47.6 ND 22.0 22.1 46.2 44.2 1 44.0-142 0.454 50
4-Chloro-3-methylphenol 47.6 ND 29.8 31.8 62.6 63.6 1 22.0-147 6.49 73
2-Chlorophenol 47.6 ND 27.6 27.2 58.0 54.4 1 23.0-134 1.46 61
2,4-Dichlorophenol 47.6 ND 31.1 30.7 65.3 61.4 1 39.0-135 1.29 50
2,4-Dimethylphenol 47.6 ND 30.0 30.8 63.0 61.6 1 32.0-120 2.63 58
4,6-Dinitro-2-methylphenol 47.6 ND 33.4 35.6 70.2 71.2 1 1.00-181 6.38 203
2,4-Dinitrophenol 47.6 ND 33.3 26.8 70.0 53.6 1 1.00-191 21.6 132
2-Nitrophenol 47.6 ND 31.1 28.4 65.3 56.8 1 29.0-182 9.08 55
4-Nitrophenol 47.6 ND 23.0 23.6 48.3 47.2 1 1.00-132 2.58 131
Pentachlorophenol 47.6 ND 29.7 32.4 62.4 64.8 1 14.0-176 8.70 86
Phenol 47.6 ND 16.1 16.3 33.8 32.6 1 5.00-120 1.23 64
2,4,6-Trichlorophenol 47.6 ND 32.4 32.0 68.1 64.0 1 37.0-144 1.24 58
(S) 2-Fluorophenol 41.1 38.3 10.0-120
(S) Phenol-d5 29.1 28.8 8.00-424
(S) Nitrobenzene-d5 53.3 47.6 15.0-314
(S) 2-Fluorobiphenyl 44.5 45.7 22.0-127
(S) 2,4,6-Tribromophenol 56.3 55.0 10.0-153
(S) p-Terphenyl-d14 35.6 38.1 29.0-141
Sample Narrative:
OS: Surrogate recovery within historical limits.
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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GLOSSARY OF TERMS
Guide to Reading and Understanding Your Laboratory Report
The information below is designed to better explain the various terms used in your report of analytical results from the Laboratory. This is not
intended as a comprehensive explanation, and if you have additional questions please contact your project representative.
Results Disclaimer - Information that may be provided by the customer, and contained within this report, include Permit Limits, Project Name,
Sample ID, Sample Matrix, Sample Preservation, Field Blanks, Field Spikes, Field Duplicates, On-Site Data, Sampling Collection Dates/Times, and
Sampling Location. Results relate to the accuracy of this information provided, and as the samples are received.
Abbreviations and Definitions
MDL Method Detection Limit.
ND Not detected at the Reporting Limit (or MDL where applicable).
RDL Reported Detection Limit.
Rec.Recovery.
RT Retention Time.
RPD Relative Percent Difference.
SDG Sample Delivery Group.
(S)
Surrogate (Surrogate Standard) - Analytes added to every blank, sample, Laboratory Control Sample/Duplicate and
Matrix Spike/Duplicate; used to evaluate analytical efficiency by measuring recovery. Surrogates are not expected to be
detected in all environmental media.
U Not detected at the Reporting Limit (or MDL where applicable).
Analyte The name of the particular compound or analysis performed. Some Analyses and Methods will have multiple analytes
reported.
Dilution
If the sample matrix contains an interfering material, the sample preparation volume or weight values differ from the
standard, or if concentrations of analytes in the sample are higher than the highest limit of concentration that the
laboratory can accurately report, the sample may be diluted for analysis. If a value different than 1 is used in this field, the
result reported has already been corrected for this factor.
Limits
These are the target % recovery ranges or % difference value that the laboratory has historically determined as normal
for the method and analyte being reported. Successful QC Sample analysis will target all analytes recovered or
duplicated within these ranges.
Original Sample The non-spiked sample in the prep batch used to determine the Relative Percent Difference (RPD) from a quality control
sample. The Original Sample may not be included within the reported SDG.
Qualifier
This column provides a letter and/or number designation that corresponds to additional information concerning the result
reported. If a Qualifier is present, a definition per Qualifier is provided within the Glossary and Definitions page and
potentially a discussion of possible implications of the Qualifier in the Case Narrative if applicable.
Result
The actual analytical final result (corrected for any sample specific characteristics) reported for your sample. If there was
no measurable result returned for a specific analyte, the result in this column may state “ND” (Not Detected) or “BDL”
(Below Detectable Levels). The information in the results column should always be accompanied by either an MDL
(Method Detection Limit) or RDL (Reporting Detection Limit) that defines the lowest value that the laboratory could detect
or report for this analyte.
Uncertainty
(Radiochemistry)Confidence level of 2 sigma.
Case Narrative (Cn)
A brief discussion about the included sample results, including a discussion of any non-conformances to protocol
observed either at sample receipt by the laboratory from the field or during the analytical process. If present, there will
be a section in the Case Narrative to discuss the meaning of any data qualifiers used in the report.
Quality Control
Summary (Qc)
This section of the report includes the results of the laboratory quality control analyses required by procedure or
analytical methods to assist in evaluating the validity of the results reported for your samples. These analyses are not
being performed on your samples typically, but on laboratory generated material.
Sample Chain of
Custody (Sc)
This is the document created in the field when your samples were initially collected. This is used to verify the time and
date of collection, the person collecting the samples, and the analyses that the laboratory is requested to perform. This
chain of custody also documents all persons (excluding commercial shippers) that have had control or possession of the
samples from the time of collection until delivery to the laboratory for analysis.
Sample Results (Sr)
This section of your report will provide the results of all testing performed on your samples. These results are provided
by sample ID and are separated by the analyses performed on each sample. The header line of each analysis section for
each sample will provide the name and method number for the analysis reported.
Sample Summary (Ss)This section of the Analytical Report defines the specific analyses performed for each sample ID, including the dates and
times of preparation and/or analysis.
Qualifier Description
C4 The reported concentration is an estimate. The continuing calibration standard associated with this data responded low.
Data is likely to show a low bias concerning the result.
J The identification of the analyte is acceptable; the reported value is an estimate.
J1 Surrogate recovery limits have been exceeded; values are outside upper control limits.
J2 Surrogate recovery limits have been exceeded; values are outside lower control limits.
J3 The associated batch QC was outside the established quality control range for precision.
J4 The associated batch QC was outside the established quality control range for accuracy.
J6 The sample matrix interfered with the ability to make any accurate determination; spike value is low.
N The analyte is tentatively identified and the associated numerical value may not be consistent with the actual concentration present in the sample.
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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GLOSSARY OF TERMS
Qualifier Description
Q Sample was prepared and/or analyzed past holding time as defined in the method. Concentrations should be
considered minimum values.
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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Pace Analytical National 12065 Lebanon Rd Mount Juliet, TN 37122
Alabama 40660 Nebraska NE-OS-15-05
Alaska 17-026 Nevada TN000032021-1
Arizona AZ0612 New Hampshire 2975
Arkansas 88-0469 New Jersey–NELAP TN002
California 2932 New Mexico ¹TN00003
Colorado TN00003 New York 11742
Connecticut PH-0197 North Carolina Env375
Florida E87487 North Carolina ¹DW21704
Georgia NELAP North Carolina ³41
Georgia ¹923 North Dakota R-140
Idaho TN00003 Ohio–VAP CL0069
Illinois 200008 Oklahoma 9915
Indiana C-TN-01 Oregon TN200002
Iowa 364 Pennsylvania 68-02979
Kansas E-10277 Rhode Island LAO00356
Kentucky ¹ ⁶KY90010 South Carolina 84004002
Kentucky ²16 South Dakota n/a
Louisiana AI30792 Tennessee ¹ ⁴2006
Louisiana LA018 Texas T104704245-20-18
Maine TN00003 Texas ⁵LAB0152
Maryland 324 Utah TN000032021-11
Massachusetts M-TN003 Vermont VT2006
Michigan 9958 Virginia 110033
Minnesota 047-999-395 Washington C847
Mississippi TN00003 West Virginia 233
Missouri 340 Wisconsin 998093910
Montana CERT0086 Wyoming A2LA
A2LA – ISO 17025 1461.01 AIHA-LAP,LLC EMLAP 100789
A2LA – ISO 17025 ⁵1461.02 DOD 1461.01
Canada 1461.01 USDA P330-15-00234
EPA–Crypto TN00003
ACCREDITATIONS & LOCATIONS

¹ Drinking Water ² Underground Storage Tanks ³ Aquatic Toxicity ⁴ Chemical/Microbiological ⁵ Mold ⁶ Wastewater n/a Accreditation not applicable
* Not all certifications held by the laboratory are applicable to the results reported in the attached report.
* Accreditation is only applicable to the test methods specified on each scope of accreditation held by Pace Analytical.
1 Cp
2Tc
3Ss
4Cn
5Sr
6Qc
7Gl
8Al
9Sc
ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE:
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APPENDIX C
AQTESOLV RESULTS
AQTESOLV for Windows
Data Set: \\P75WFS01\Data\Projects\2020\75207132\Working Files\Diagrams-Drawings-Figures\Model\AQTESOLV\mw5r slug in.aqt
Date: 10/14/22
Time: 16:45:15
PROJECT INFORMATION
Company: Terracon
Client: NCDEQ
Project: 75207132
Location: Creston, NC
Test Date: 10/6/22
Test Well: MW-5R
AQUIFER DATA
Saturated Thickness: 20.1 ft
Anisotropy Ratio (Kz/Kr): 1.
SLUG TEST WELL DATA
Test Well:MW-5R
X Location: 0. ft
Y Location: 0. ft
Initial Displacement: 0.29 ft
Static Water Column Height: 4.1 ft
Casing Radius: 0.083 ft
Well Radius: 0.083 ft
Well Skin Radius: 0.083 ft
Screen Length: 4.1 ft
Total Well Penetration Depth: 4.1 ft
No. of Observations: 32
Observation Data
Time (min)Displacement (ft)Time (min)Displacement (ft)
2.37 0.5.96 0.033
2.51 0.017 6.31 0.028
2.66 0.29 6.68 0.026
2.82 0.136 7.08 0.026
2.981 0.112 7.5 0.02
3.16 0.098 7.94 0.02
3.35 0.084 8.41 0.012
3.55 0.006 8.91 0.016
3.76 0.069 9.44 0.018
3.983 0.059 10.0.02
4.22 0.057 10.6 0.014
4.47 0.053 11.2 0.015
4.735 0.047 11.9 0.011
5.01 0.038 12.6 0.017
5.31 0.036 13.3 0.011
5.62 0.037 14.1 0.009
10/14/22 1 16:45:15
AQTESOLV for Windows
SOLUTION
Slug Test
Aquifer Model: Unconfined
Solution Method: Bouwer-Rice
ln(Re/rw): 2.524
VISUAL ESTIMATION RESULTS
Estimated Parameters
Parameter Estimate
K 0.0006373 ft/min
y0 0.2148 ft
K = 0.0003238 cm/sec
T = K*b = 0.01281 ft²/min (0.1984 sq. cm/sec)
AUTOMATIC ESTIMATION RESULTS
Estimated Parameters
Parameter Estimate Std. Error Approx. C.I.t-Ratio
K 0.0006373 0.0002535 +/- 0.0005177 2.514 ft/min
y0 0.2148 0.09497 +/- 0.1939 2.262 ft
C.I. is approximate 95% confidence interval for parameter
t-ratio = estimate/std. error
No estimation window
K = 0.0003238 cm/sec
T = K*b = 0.01281 ft²/min (0.1984 sq. cm/sec)
Parameter Correlations
K y0
K 1.00 0.94
y0 0.94 1.00
Residual Statistics
for weighted residuals
Sum of Squares.. 0.06373 ft2
Variance.......... 0.002124 ft2
Std. Deviation .... 0.04609 ft
Mean ............. 0.0009342 ft
No. of Residuals . 32
No. of Estimates.. 2
10/14/22 2 16:45:15
0.4.8.12.16.20.
0.001
0.01
0.1
1.
Time (min)Normalized Head (ft/ft)WELL TEST ANALYSIS
Data Set:\...\mw5r slug in.aqt
Date:10/14/22 Time:16:44:51
PROJECT INFORMATION
Company:Terracon
Client:NCDEQ
Project:75207132
Location:Creston, NC
Test Well:MW-5R
Test Date:10/6/22
AQUIFER DATA
Saturated Thickness:20.1 ft Anisotropy Ratio (Kz/Kr):1.
WELL DATA (MW-5R)
Initial Displacement:0.29 ft Static Water Column Height:4.1 ft
Total Well Penetration Depth:4.1 ft Screen Length:4.1 ft
Casing Radius:0.083 ft Well Radius:0.083 ft
SOLUTION
Aquifer Model:Unconfined Solution Method:Bouwer-Rice
K =0.0006373 ft/min y0 =0.2148 ft
AQTESOLV for Windows
Data Set: \\P75WFS01\Data\Projects\2020\75207132\Working Files\Diagrams-Drawings-Figures\Model\AQTESOLV\mw5r slug out.aqt
Date: 10/14/22
Time: 16:46:03
PROJECT INFORMATION
Company: Terracon
Client: NCDEQ
Project: 75207132
Location: Creston, NC
Test Date: 10/6/22
Test Well: MW-5R
AQUIFER DATA
Saturated Thickness: 20.1 ft
Anisotropy Ratio (Kz/Kr): 1.
SLUG TEST WELL DATA
Test Well:MW-5R
X Location: 0. ft
Y Location: 0. ft
Initial Displacement: 0.284 ft
Static Water Column Height: 4.1 ft
Casing Radius: 0.083 ft
Well Radius: 0.083 ft
Well Skin Radius: 0.083 ft
Screen Length: 4.1 ft
Total Well Penetration Depth: 4.1 ft
No. of Observations: 37
Observation Data
Time (min)Displacement (ft)Time (min)Displacement (ft)
1.505 0.4.47 0.031
1.58 0.006 4.73 0.032
1.68 0.149 5.011 0.029
1.78 0.284 5.31 0.03
1.88 0.138 5.62 0.028
1.99 0.109 5.96 0.025
2.11 0.087 6.31 0.028
2.24 0.081 6.681 0.024
2.37 0.068 7.08 0.026
2.51 0.065 7.5 0.02
2.66 0.058 7.94 0.02
2.82 0.05 8.41 0.023
2.98 0.051 8.91 0.022
3.16 0.048 9.44 0.021
3.35 0.044 10.0.022
3.55 0.042 10.6 0.02
3.76 0.041 11.2 0.021
10/14/22 1 16:46:03
AQTESOLV for Windows
Time (min)Displacement (ft)Time (min)Displacement (ft)
3.98 0.036 11.9 0.023
4.22 0.038
SOLUTION
Slug Test
Aquifer Model: Unconfined
Solution Method: Bouwer-Rice
ln(Re/rw): 2.524
VISUAL ESTIMATION RESULTS
Estimated Parameters
Parameter Estimate
K 0.0006732 ft/min
y0 0.1682 ft
K = 0.000342 cm/sec
T = K*b = 0.01353 ft²/min (0.2095 sq. cm/sec)
AUTOMATIC ESTIMATION RESULTS
Estimated Parameters
Parameter Estimate Std. Error Approx. C.I.t-Ratio
K 0.0006732 0.0002309 +/- 0.0004686 2.916 ft/min
y0 0.1682 0.05 +/- 0.1015 3.364 ft
C.I. is approximate 95% confidence interval for parameter
t-ratio = estimate/std. error
No estimation window
K = 0.000342 cm/sec
T = K*b = 0.01353 ft²/min (0.2095 sq. cm/sec)
Parameter Correlations
K y0
K 1.00 0.91
y0 0.91 1.00
Residual Statistics
for weighted residuals
Sum of Squares.. 0.06417 ft2
Variance.......... 0.001834 ft2
Std. Deviation .... 0.04282 ft
Mean ............. 0.001969 ft
No. of Residuals . 37
No. of Estimates.. 2
10/14/22 2 16:46:03
0.4.8.12.16.20.
0.001
0.01
0.1
1.
Time (min)Normalized Head (ft/ft)WELL TEST ANALYSIS
Data Set:\...\mw5r slug out.aqt
Date:10/14/22 Time:16:45:46
PROJECT INFORMATION
Company:Terracon
Client:NCDEQ
Project:75207132
Location:Creston, NC
Test Well:MW-5R
Test Date:10/6/22
AQUIFER DATA
Saturated Thickness:20.1 ft Anisotropy Ratio (Kz/Kr):1.
WELL DATA (MW-5R)
Initial Displacement:0.284 ft Static Water Column Height:4.1 ft
Total Well Penetration Depth:4.1 ft Screen Length:4.1 ft
Casing Radius:0.083 ft Well Radius:0.083 ft
SOLUTION
Aquifer Model:Unconfined Solution Method:Bouwer-Rice
K =0.0006732 ft/min y0 =0.1682 ft
AQTESOLV for Windows
Data Set: \\P75WFS01\Data\Projects\2020\75207132\Working Files\Diagrams-Drawings-Figures\Model\AQTESOLV\mw11 slug in.aqt
Date: 10/14/22
Time: 16:48:11
PROJECT INFORMATION
Company: Terracon
Client: NCDEQ
Project: 75207132
Location: Creston, NC
Test Date: 10/6/22
Test Well: MW-5R
AQUIFER DATA
Saturated Thickness: 22.05 ft
Anisotropy Ratio (Kz/Kr): 1.
SLUG TEST WELL DATA
Test Well:MW-11
X Location: 0. ft
Y Location: 0. ft
Initial Displacement: 0.538 ft
Static Water Column Height: 6.05 ft
Casing Radius: 0.083 ft
Well Radius: 0.083 ft
Well Skin Radius: 0.083 ft
Screen Length: 6.05 ft
Total Well Penetration Depth: 6.05 ft
No. of Observations: 28
Observation Data
Time (min)Displacement (ft)Time (min)Displacement (ft)
2.98 0.6.68 0.088
3.16 -0.004 7.08 0.083
3.35 0.538 7.5 0.077
3.55 0.354 7.94 0.066
3.76 0.289 8.41 0.06
3.98 0.245 8.91 0.059
4.22 0.211 9.44 0.05
4.47 0.185 10.0.046
4.73 0.163 10.6 0.041
5.01 0.151 11.2 0.038
5.31 0.134 11.9 0.037
5.62 0.123 12.6 0.03
5.96 0.11 13.3 0.025
6.31 0.102 14.1 0.031
SOLUTION
10/14/22 1 16:48:11
AQTESOLV for Windows
Slug Test
Aquifer Model: Unconfined
Solution Method: Bouwer-Rice
ln(Re/rw): 2.85
VISUAL ESTIMATION RESULTS
Estimated Parameters
Parameter Estimate
K 0.0006373 ft/min
y0 0.9375 ft
K = 0.0003238 cm/sec
T = K*b = 0.01405 ft²/min (0.2176 sq. cm/sec)
10/14/22 2 16:48:11
0.4.8.12.16.20.
0.001
0.01
0.1
1.
Time (min)Normalized Head (ft/ft)WELL TEST ANALYSIS
Data Set:\...\mw11 slug in.aqt
Date:10/14/22 Time:16:47:59
PROJECT INFORMATION
Company:Terracon
Client:NCDEQ
Project:75207132
Location:Creston, NC
Test Well:MW-5R
Test Date:10/6/22
AQUIFER DATA
Saturated Thickness:22.05 ft Anisotropy Ratio (Kz/Kr):1.
WELL DATA (MW-11)
Initial Displacement:0.538 ft Static Water Column Height:6.05 ft
Total Well Penetration Depth:6.05 ft Screen Length:6.05 ft
Casing Radius:0.083 ft Well Radius:0.083 ft
SOLUTION
Aquifer Model:Unconfined Solution Method:Bouwer-Rice
K =0.0006373 ft/min y0 =0.9375 ft
AQTESOLV for Windows
Data Set: \\P75WFS01\Data\Projects\2020\75207132\Working Files\Diagrams-Drawings-Figures\Model\AQTESOLV\mw11 slug out.aqt
Date: 10/14/22
Time: 16:48:50
PROJECT INFORMATION
Company: Terracon
Client: NCDEQ
Project: 75207132
Location: Creston, NC
Test Date: 10/6/22
Test Well: MW-5R
AQUIFER DATA
Saturated Thickness: 22.05 ft
Anisotropy Ratio (Kz/Kr): 1.
SLUG TEST WELL DATA
Test Well:MW-11
X Location: 0. ft
Y Location: 0. ft
Initial Displacement: 0.923 ft
Static Water Column Height: 6.05 ft
Casing Radius: 0.083 ft
Well Radius: 0.083 ft
Well Skin Radius: 0.083 ft
Screen Length: 6.05 ft
Total Well Penetration Depth: 6.05 ft
No. of Observations: 38
Observation Data
Time (min)Displacement (ft)Time (min)Displacement (ft)
1.5 0.4.47 0.073
1.58 0.923 4.73 0.067
1.68 0.677 5.01 0.065
1.78 0.514 5.31 0.06
1.88 0.408 5.62 0.056
1.99 0.336 5.96 0.054
2.11 0.282 6.31 0.042
2.24 0.244 6.68 0.046
2.37 0.213 7.08 0.044
2.51 0.184 7.5 0.048
2.66 0.167 7.94 0.046
2.82 0.148 8.41 0.044
2.98 0.139 8.91 0.041
3.16 0.121 9.44 0.038
3.35 0.115 10.0.045
3.55 0.1 10.6 0.036
3.76 0.092 11.2 0.038
10/14/22 1 16:48:50
AQTESOLV for Windows
Time (min)Displacement (ft)Time (min)Displacement (ft)
3.98 0.087 11.9 0.036
4.22 0.078 12.6 0.035
SOLUTION
Slug Test
Aquifer Model: Unconfined
Solution Method: Bouwer-Rice
ln(Re/rw): 2.85
VISUAL ESTIMATION RESULTS
Estimated Parameters
Parameter Estimate
K 0.0006373 ft/min
y0 0.4699 ft
K = 0.0003238 cm/sec
T = K*b = 0.01405 ft²/min (0.2176 sq. cm/sec)
10/14/22 2 16:48:50
0.4.8.12.16.20.
0.001
0.01
0.1
1.
Time (min)Normalized Head (ft/ft)WELL TEST ANALYSIS
Data Set:\...\mw11 slug out.aqt
Date:10/14/22 Time:16:48:36
PROJECT INFORMATION
Company:Terracon
Client:NCDEQ
Project:75207132
Location:Creston, NC
Test Well:MW-5R
Test Date:10/6/22
AQUIFER DATA
Saturated Thickness:22.05 ft Anisotropy Ratio (Kz/Kr):1.
WELL DATA (MW-11)
Initial Displacement:0.923 ft Static Water Column Height:6.05 ft
Total Well Penetration Depth:6.05 ft Screen Length:6.05 ft
Casing Radius:0.083 ft Well Radius:0.083 ft
SOLUTION
Aquifer Model:Unconfined Solution Method:Bouwer-Rice
K =0.0006373 ft/min y0 =0.4699 ft
AQTESOLV for Windows
Data Set: \\P75WFS01\Data\Projects\2020\75207132\Working Files\Diagrams-Drawings-Figures\Model\AQTESOLV\mw13 slug in.aqt
Date: 10/14/22
Time: 16:49:22
PROJECT INFORMATION
Company: Terracon
Client: NCDEQ
Project: 75207132
Location: Creston, NC
Test Date: 10/6/22
Test Well: MW-5R
AQUIFER DATA
Saturated Thickness: 25.4 ft
Anisotropy Ratio (Kz/Kr): 1.
SLUG TEST WELL DATA
Test Well:MW-13
X Location: 0. ft
Y Location: 0. ft
Initial Displacement: 0.277 ft
Static Water Column Height: 7.4 ft
Casing Radius: 0.083 ft
Well Radius: 0.083 ft
Well Skin Radius: 0.083 ft
Screen Length: 7.4 ft
Total Well Penetration Depth: 7.4 ft
No. of Observations: 29
Observation Data
Time (min)Displacement (ft)Time (min)Displacement (ft)
3.55 0.8.41 0.032
3.76 0.072 8.91 0.021
3.98 0.277 9.44 0.014
4.22 0.207 10.-0.001
4.47 0.185 10.6 -0.014
4.73 0.17 11.2 -0.019
5.01 0.15 11.9 -0.035
5.31 0.132 12.6 -0.044
5.62 0.115 13.3 -0.05
5.96 0.1 14.1 -0.064
6.31 0.089 15.-0.075
6.68 0.072 15.8 -0.085
7.08 0.067 16.8 -0.098
7.5 0.051 17.8 -0.106
7.94 0.042
SOLUTION
10/14/22 1 16:49:22
AQTESOLV for Windows
Slug Test
Aquifer Model: Unconfined
Solution Method: Bouwer-Rice
ln(Re/rw): 3.011
VISUAL ESTIMATION RESULTS
Estimated Parameters
Parameter Estimate
K 0.0005391 ft/min
y0 0.5562 ft
K = 0.0002739 cm/sec
T = K*b = 0.01369 ft²/min (0.212 sq. cm/sec)
AUTOMATIC ESTIMATION RESULTS
Estimated Parameters
Parameter Estimate Std. Error Approx. C.I.t-Ratio
K 0.0004484 0.0001697 +/- 0.0003482 2.642 ft/min
y0 0.5562 0.3229 +/- 0.6626 1.722 ft
C.I. is approximate 95% confidence interval for parameter
t-ratio = estimate/std. error
No estimation window
K = 0.0002278 cm/sec
T = K*b = 0.01139 ft²/min (0.1763 sq. cm/sec)
Parameter Correlations
K y0
K 1.00 0.97
y0 0.97 1.00
Residual Statistics
for weighted residuals
Sum of Squares.. 0.1206 ft2
Variance.......... 0.004467 ft2
Std. Deviation .... 0.06683 ft
Mean ............. -0.01997 ft
No. of Residuals . 29
No. of Estimates.. 2
10/14/22 2 16:49:22
0.4.8.12.16.20.
0.001
0.01
0.1
1.
Time (min)Normalized Head (ft/ft)WELL TEST ANALYSIS
Data Set:\...\mw13 slug in.aqt
Date:10/14/22 Time:16:49:10
PROJECT INFORMATION
Company:Terracon
Client:NCDEQ
Project:75207132
Location:Creston, NC
Test Well:MW-5R
Test Date:10/6/22
AQUIFER DATA
Saturated Thickness:25.4 ft Anisotropy Ratio (Kz/Kr):1.
WELL DATA (MW-13)
Initial Displacement:0.277 ft Static Water Column Height:7.4 ft
Total Well Penetration Depth:7.4 ft Screen Length:7.4 ft
Casing Radius:0.083 ft Well Radius:0.083 ft
SOLUTION
Aquifer Model:Unconfined Solution Method:Bouwer-Rice
K =0.0005391 ft/min y0 =0.5562 ft
AQTESOLV for Windows
Data Set: \\P75WFS01\Data\Projects\2020\75207132\Working Files\Diagrams-Drawings-Figures\Model\AQTESOLV\mw13 slug out.aqt
Date: 10/14/22
Time: 16:49:58
PROJECT INFORMATION
Company: Terracon
Client: NCDEQ
Project: 75207132
Location: Creston, NC
Test Date: 10/6/22
Test Well: MW-5R
AQUIFER DATA
Saturated Thickness: 25.4 ft
Anisotropy Ratio (Kz/Kr): 1.
SLUG TEST WELL DATA
Test Well:MW-13
X Location: 0. ft
Y Location: 0. ft
Initial Displacement: 0.575 ft
Static Water Column Height: 7.4 ft
Casing Radius: 0.083 ft
Well Radius: 0.083 ft
Well Skin Radius: 0.083 ft
Screen Length: 7.4 ft
Total Well Penetration Depth: 7.4 ft
No. of Observations: 44
Observation Data
Time (min)Displacement (ft)Time (min)Displacement (ft)
1.58 0.5.621 0.107
1.68 0.575 5.96 0.11
1.782 0.304 6.31 0.109
1.88 0.21 6.68 0.113
1.99 0.158 7.08 0.104
2.11 0.146 7.5 0.106
2.24 0.13 7.94 0.108
2.37 0.122 8.41 0.107
2.51 0.116 8.91 0.11
2.66 0.118 9.44 0.108
2.82 0.112 10.0.11
2.98 0.108 10.6 0.119
3.16 0.105 11.2 0.119
3.35 0.111 11.9 0.12
3.55 0.103 12.6 0.122
3.76 0.103 13.3 0.112
3.98 0.105 14.1 0.113
10/14/22 1 16:49:58
AQTESOLV for Windows
Time (min)Displacement (ft)Time (min)Displacement (ft)
4.22 0.103 15.0.115
4.47 0.104 15.81 0.125
4.73 0.101 16.8 0.125
5.01 0.107 17.8 0.126
5.31 0.107 18.8 0.136
SOLUTION
Slug Test
Aquifer Model: Unconfined
Solution Method: Bouwer-Rice
ln(Re/rw): 3.011
VISUAL ESTIMATION RESULTS
Estimated Parameters
Parameter Estimate
K 0.0006427 ft/min
y0 0.4077 ft
K = 0.0003265 cm/sec
T = K*b = 0.01632 ft²/min (0.2528 sq. cm/sec)
AUTOMATIC ESTIMATION RESULTS
Estimated Parameters
Parameter Estimate Std. Error Approx. C.I.t-Ratio
K 3.873E-5 2.971E-5 +/- 5.996E-5 1.303 ft/min
y0 0.155 0.02386 +/- 0.04815 6.496 ft
C.I. is approximate 95% confidence interval for parameter
t-ratio = estimate/std. error
No estimation window
K = 1.967E-5 cm/sec
T = K*b = 0.0009836 ft²/min (0.01523 sq. cm/sec)
Parameter Correlations
K y0
K 1.00 0.81
y0 0.81 1.00
Residual Statistics
for weighted residuals
Sum of Squares.. 0.257 ft2
Variance.......... 0.006119 ft2
Std. Deviation .... 0.07823 ft
Mean ............. 0.0001944 ft
10/14/22 2 16:49:58
AQTESOLV for Windows
No. of Residuals . 44
No. of Estimates.. 2
10/14/22 3 16:49:58
0.4.8.12.16.20.
0.001
0.01
0.1
1.
Time (min)Normalized Head (ft/ft)WELL TEST ANALYSIS
Data Set:\...\mw13 slug out.aqt
Date:10/14/22 Time:16:49:46
PROJECT INFORMATION
Company:Terracon
Client:NCDEQ
Project:75207132
Location:Creston, NC
Test Well:MW-5R
Test Date:10/6/22
AQUIFER DATA
Saturated Thickness:25.4 ft Anisotropy Ratio (Kz/Kr):1.
WELL DATA (MW-13)
Initial Displacement:0.575 ft Static Water Column Height:7.4 ft
Total Well Penetration Depth:7.4 ft Screen Length:7.4 ft
Casing Radius:0.083 ft Well Radius:0.083 ft
SOLUTION
Aquifer Model:Unconfined Solution Method:Bouwer-Rice
K =0.0006427 ft/min y0 =0.4077 ft
AQTESOLV for Windows
Data Set: \\P75WFS01\Data\Projects\2020\75207132\Working Files\Diagrams-Drawings-Figures\Model\AQTESOLV\mw15 slug in.aqt
Date: 10/14/22
Time: 16:50:33
PROJECT INFORMATION
Company: Terracon
Client: NCDEQ
Project: 75207132
Location: Creston, NC
Test Date: 10/6/22
Test Well: MW-5R
AQUIFER DATA
Saturated Thickness: 22.74 ft
Anisotropy Ratio (Kz/Kr): 1.
SLUG TEST WELL DATA
Test Well:MW-15
X Location: 0. ft
Y Location: 0. ft
Initial Displacement: 0.43 ft
Static Water Column Height: 12.74 ft
Casing Radius: 0.083 ft
Well Radius: 0.083 ft
Well Skin Radius: 0.083 ft
Screen Length: 12.74 ft
Total Well Penetration Depth: 12.74 ft
No. of Observations: 13
Observation Data
Time (min)Displacement (ft)Time (min)Displacement (ft)
9.44 0.14.1 0.004
10.0.43 15.0.002
10.6 0.152 15.8 -0.002
11.2 0.066 16.8 -0.013
11.9 0.027 17.8 -0.013
12.6 0.013 18.8 -0.011
13.3 0.013
SOLUTION
Slug Test
Aquifer Model: Unconfined
Solution Method: Bouwer-Rice
ln(Re/rw): 3.522
VISUAL ESTIMATION RESULTS
10/14/22 1 16:50:33
AQTESOLV for Windows
Estimated Parameters
Parameter Estimate
K 0.0006481 ft/min
y0 10.01 ft
K = 0.0003293 cm/sec
T = K*b = 0.01474 ft²/min (0.2282 sq. cm/sec)
10/14/22 2 16:50:33
0.4.8.12.16.20.
0.001
0.01
0.1
1.
Time (min)Normalized Head (ft/ft)WELL TEST ANALYSIS
Data Set:\...\mw15 slug in.aqt
Date:10/14/22 Time:16:50:19
PROJECT INFORMATION
Company:Terracon
Client:NCDEQ
Project:75207132
Location:Creston, NC
Test Well:MW-5R
Test Date:10/6/22
AQUIFER DATA
Saturated Thickness:22.74 ft Anisotropy Ratio (Kz/Kr):1.
WELL DATA (MW-15)
Initial Displacement:0.43 ft Static Water Column Height:12.74 ft
Total Well Penetration Depth:12.74 ft Screen Length:12.74 ft
Casing Radius:0.083 ft Well Radius:0.083 ft
SOLUTION
Aquifer Model:Unconfined Solution Method:Bouwer-Rice
K =0.0006481 ft/min y0 =10.01 ft
AQTESOLV for Windows
Data Set: \\P75WFS01\Data\Projects\2020\75207132\Working Files\Diagrams-Drawings-Figures\Model\AQTESOLV\mw15 slug out.aqt
Date: 10/14/22
Time: 16:51:05
PROJECT INFORMATION
Company: Terracon
Client: NCDEQ
Project: 75207132
Location: Creston, NC
Test Date: 10/6/22
Test Well: MW-5R
AQUIFER DATA
Saturated Thickness: 22.74 ft
Anisotropy Ratio (Kz/Kr): 1.
SLUG TEST WELL DATA
Test Well:MW-15
X Location: 0. ft
Y Location: 0. ft
Initial Displacement: 0.499 ft
Static Water Column Height: 12.74 ft
Casing Radius: 0.083 ft
Well Radius: 0.083 ft
Well Skin Radius: 0.083 ft
Screen Length: 12.74 ft
Total Well Penetration Depth: 12.74 ft
No. of Observations: 25
Observation Data
Time (min)Displacement (ft)Time (min)Displacement (ft)
2.51 0.5.31 -0.016
2.66 0.005 5.62 -0.014
2.82 0.499 5.964 -0.016
2.98 0.265 6.31 -0.011
3.16 0.141 6.68 -0.01
3.35 0.057 7.08 -0.004
3.55 0.012 7.5 -0.006
3.76 -0.007 7.94 -0.003
3.98 -0.023 8.41 -0.002
4.22 -0.027 8.91 -0.01
4.47 -0.029 9.44 0.
4.73 -0.024 10.0.003
5.01 -0.022
SOLUTION
Slug Test
10/14/22 1 16:51:05
AQTESOLV for Windows
Aquifer Model: Unconfined
Solution Method: Bouwer-Rice
ln(Re/rw): 3.522
VISUAL ESTIMATION RESULTS
Estimated Parameters
Parameter Estimate
K 0.0006775 ft/min
y0 0.2888 ft
K = 0.0003442 cm/sec
T = K*b = 0.01541 ft²/min (0.2385 sq. cm/sec)
10/14/22 2 16:51:05
0.2.4.6.8.10.
0.001
0.01
0.1
1.
Time (min)Normalized Head (ft/ft)WELL TEST ANALYSIS
Data Set:\...\mw15 slug out.aqt
Date:10/14/22 Time:16:50:51
PROJECT INFORMATION
Company:Terracon
Client:NCDEQ
Project:75207132
Location:Creston, NC
Test Well:MW-5R
Test Date:10/6/22
AQUIFER DATA
Saturated Thickness:22.74 ft Anisotropy Ratio (Kz/Kr):1.
WELL DATA (MW-15)
Initial Displacement:0.499 ft Static Water Column Height:12.74 ft
Total Well Penetration Depth:12.74 ft Screen Length:12.74 ft
Casing Radius:0.083 ft Well Radius:0.083 ft
SOLUTION
Aquifer Model:Unconfined Solution Method:Bouwer-Rice
K =0.0006775 ft/min y0 =0.2888 ft

APPENDIX D
RBCA TOOLKIT MODEL RESULTS

RBCA Tool Kit for Chemical Releases, Version 2.6
#4. RBCA Evaluation Process
1. Project Information
Site Name:
Location:
Completed By:
Date:1-Oct-22 Job ID:75207132
2. Which Type of RBCA Analysis?
####
####
####
3. Calculation Options
###
###
Individual Constituent Risk Goals Only
Individual and Cumulative Risk Goals 5. Commands and Options
Apply Source Depletion Algorithm
Time to Future Exposure 0 (yr)
C. Driscoll
Creston, NC
Stephens Exxon
Baseline Risks (Forward mode)
RBCA Cleanup Levels (Backward mode)
Main Screen
Affects which input data are required
Prepare Input Data Review Output
Data Complete? ( = yes, = no)
Site-Specific
Target Levels
Risk-Based
Screening
Levels
Tie Tier 2/3
RBCA Tool Kit for Chemical Releases
© 2011 GSI Environmental Inc.Version 2.6
User Chemical
Database
?
Print Sheet
New Site
QuitHelp
Save
?
Set Units Print
Load Data...
Exposure Pathways
Air ParametersAir Parameters
GW Parameters
Soil ParametersSoil Parameters
Transport Models
Constituents of Concern
(COCs)
Exposure Flowchart
COC Chem. Parameters
Input Data Summary
User-Spec. COC Data...
Transient Domenico Analysis...
Baseline Risks...
Cleanup Levels...
Kerosene Plume - Calibration
RBCA Tool Kit for Chemical Releases, Version 2.6
#Site Name: Stephens Exxon
Location: Creston, NC
1. Groundwater Exposure Compl. By: C. Driscoll
Groundwater Ingestion/Job ID: 75207132 Date: 1-Oct-22
Surface Water Impact 3. Air Exposure
Receptor: to Outdoor Air Inhalation
On-site Off-site1 Off-site2 Receptor:
Distance:0 40 0 (ft)On-site Off-site1 Off-site2
Source Media:Distance:0 0 0 (ft)
Affected Groundwater Source Media:Construction worker
Affected Soils Leaching to Groundwater Affected Soils--Volatilization to Ambient Outdoor Air
Option:Affected Groundwater--Volatilization to Ambient Outdoor Air
Apply MCL value as ingestion RBEL (backward mode only)Affected Surface Soils--Particulates to Ambient Outdoor Air
GW Discharge to Surface Water Exposure Volatilization to Indoor Air Inhalation
Swimming Receptor:
Fish Consumption On-site Off-site1 Off-site2
Specified Water Quality Criteria Source Media:Distance:0 0 0 (ft)
Affected Soils--Volatilization to Enclosed Space
Affected Soils Leaching to GW--Volatilization to Enclosed Space
2. Surface Soil Exposure Affected Groundwater--Volatilization to Enclosed Space
Source Media:
Receptor: Direct Ingestion 4. Commands and Options
On-site Dermal Contact
Construction Worker Inhalation (vol+part)
Option: Vegetable Ingestion
Apply UK (CLEA) SGV as soil concentration limit
Combined Exposure
Volatilization and Particulates
Exposure Pathway Identification
Main Print Sheet Help
?
?
?
Exposure Flowchart
Set Units
?
Veg OptionsVeg Options
Bldg OptionsBldg Options
Exposure Factors & Target Risks
Enter CriteriaEnter Criteria
Kerosene Plume - Calibration
RBCA Tool Kit for Chemical Releases, Version 2.51
Site Name: Stephens Exxon Job ID: 75207132 Commands and Options
Location: Creston, NC Date: 1-Oct-22
Compl. By: C. Driscoll
Selected COCs Representative COC Concentration
Groundwater Source Zone Soil Source Zone Mole Fraction
o n in Source
n o Material
(mg/L)note (mg/kg)note (-)
Benzene 0.0E+0 Concentrations of COCs in MW-11
Toluene 0.0E+0 during 12/2011 sampling event
Ethyl benzene 0.0E+0
Xylenes (mixed isomers)9.3E-4
Naphthalene 4.4E-2
Trimethylbenzene, 1,2,4-1.9E-1
Apply
Raoul
t's
Source Media Constituents of Concern (COCs)
COC Sort List:
Top
Bottom
MoveUAdd/Ins
Delete MoveD
Main Screen Print Help
?
??
View Chemical Parameters
Enter Site DataEnter Site Data Enter Site DataEnter Site Data
Kerosene Plume - Calibration
RBCA Tool Kit for Chemical Releases, Version 2.6
##Site Name: Stephens Exxon Job ID: 75207132
Location: Creston, NC Date: 1-Oct-22
1. Vertical Transport, Surface Soil Column Compl. By: C. Driscoll
Outdoor Air Volatilization Factors 3. Groundwater Dilution Attenuation Factor
Surface soil volatilization model only
Combination surface soil/Johnson & Ettinger models
Thickness of surface soil zone 3.28 (ft)Calculate DAF using Domenico Model
User-specified VF from other model Domenico equation with dispersion only (no biodegradation)
Indoor Air Volatilization Factors Domenico equation first-order decay
Johnson & Ettinger model for soil and groundwater volatilization Modified Domenico equation using
Johnson & Ettinger for soil, Mass Flux model for groundwater electron acceptor superposition
User-specified VF from other model Biodegradation Capacity NC (mg/L)
Soil-to-Groundwater Leaching Factor — or —
ASTM Model User-Specified DAF Values
Apply Soil Attenuation Model (SAM)DAF values from other model or site data
Allow first-order biodecay
User-specified LF from other model 4. Chemical Decay and Source Depletion
Modeling Options
Disable Mass Balance Limit
Apply Dual Equilibrium Desorption Model
2. Lateral Air Dispersion Factor 5. Commands and Options
3-D Gaussian dispersion model Off-site 1 Off-site 2
User-Specified ADF 1.00E+0 1.00E+0 (-)
Transport Modeling Options
C
Enter VF ValuesEnter VF Values
Print SheetMain Screen Help
?
?
ASTM ModelASTM Model
?
Enter Source MassEnter Source Mass
Enter Decay RatesEnter Decay Rates
Enter DAF ValuesEnter DAF Values
Enter Site DataEnter Site Data
Enter Decay RatesEnter Decay Rates
Enter Decay RatesEnter Decay Rates
Enter LF ValuesEnter LF Values
Enter VF ValuesEnter VF Values
?
?
?
?
C
Kerosene Plume - Calibration
RBCA Tool Kit for Chemical Releases, Version 2.6
#Site Name: Stephens Exxon Job ID: 75207132
Location: Creston, NC Date: 1-Oct-22
1. Water-Bearing Unit Compl. By: C. Driscoll
Hydrogeology 3. Groundwater Dispersion
Groundwater Darcy velocity 5.9E+0 (ft/yr)Model:GW Ingestion
Groundwater seepage velocity 1.6E+1 (ft/yr)Off-site 1 Off-site 2 Off-site 1 Off-site 2
or Distance to GW receptors 40 0 0 0 (ft)
Hydraulic conductivity 3.2E+2 (ft/yr)
Hydraulic gradient 0.0184 (-)Longitudinal dispersivity 4 0 0 0 (ft)
Effective porosity 0.38 (-)Transverse dispersivity 1.32 0 0 0 (ft)
Sorption Vertical dispersivity 0.2 0 0 0 (ft)
Fraction organic carbon--saturated zone 0.001 (-) 4. Groundwater Discharge to Surface Water
Groundwater pH 5.8 (-)
2. Groundwater Source Zone Off-site 2
Groundwater plume width at source 50 (ft)Distance to GW/SW disharge point NA (ft)
Plume (mixing zone) thickness at source 22.05 (ft)
Plume width at GW/SW discharge (ft)
Saturated thickness 22.05 (ft)Plume thickness at GW/SW discharge (ft)
Length of source zone 147.637795 (ft)
Surface water flowrate at GW/SW discharge (ft^3/s)
5. Commands and Options
GW to Indoor Air
Site-Specific Groundwater Parameters
or
or
?
?
?
Main Screen Use/Set Default
Values
Set Units
Print Sheet
Help
?
Kerosene Plume - Calibration
RBCA Tool Kit for Chemical Releases, Version 2.51
RBCA SITE ASSESSMENT TIER 2 TRANSIENT DOMENICO ANALYSIS
Site Name: Stephens Exxon Completed By: C. Driscoll Job ID: 75207132
Site Location: Creston, NC Date Completed: 1-Oct-22 4 of 6
Constiuent:Xylenes (mixed isomers)
Source Medium:Affected Groundwater
Biodegredation:None
Concentration vs. Distance from Source Time (yr)11.0 FALSE 0 Off-site1 Off-site2
(for given time)0.0001 ##Residential None
Distance (ft)0 4 8 12 16 20 24 28 32 36 40 ###40 NA
t = 11.0 yr 9.3E-4 9.3E-4 9.3E-4 9.3E-4 9.3E-4 9.3E-4 9.3E-4 9.2E-4 9.2E-4 9.0E-4 8.7E-4 ###8.7E-4 NA
Steady-state 9.3E-4 9.3E-4 9.3E-4 9.3E-4 9.3E-4 9.3E-4 9.3E-4 9.3E-4 9.3E-4 9.2E-4 9.2E-4 #####9.2E-4 NA
POE Concentration Limit (mg/L)3.1E+0 NA
t = 11.0 yr
Concentration vs. Time Distance (ft)40 0.0001
(for given distance from source)0 0 9.0E-4
Time (yr)0 1.1 2.2 3.3 4.4 5.5 6.6 7.7 8.8 9.9 11 11 Time to Reach
x = 40 ft 0.0E+0 4.5E-8 1.9E-5 1.3E-4 3.1E-4 4.9E-4 6.3E-4 7.3E-4 8.0E-4 8.4E-4 8.7E-4 #####Conc. Limit (yr)
Off-site1 (40 ft)0.0E+0 4.5E-8 1.9E-5 1.3E-4 3.1E-4 4.9E-4 6.3E-4 7.3E-4 8.0E-4 8.4E-4 8.7E-4 Off-site1 NA
Off-site2 (0 ft)NA NA NA NA NA NA NA NA NA NA NA Off-site2 NA
x = 40 ftConc.(mg/L)Conc.(mg/L)0.0E+0
1.0E-4
2.0E-43.0E-44.0E-4
5.0E-4
6.0E-47.0E-48.0E-4
9.0E-4
1.0E-3
0 5 10 15 20 25 30 35 40Conc. (mg/L)Distance
Steady-state
t = 11.0 yr
Off-site1 Conc.Limit
Off-site2 Conc.Limit
0.0E+0
1.0E-4
2.0E-4
3.0E-4
4.0E-4
5.0E-4
6.0E-4
7.0E-4
8.0E-4
9.0E-4
0 2 4 6 8 10Conc. (mg/L)Time (yr)
x = 40 ft
Off-site1 (40 ft)
Off-site2 (0 ft)
Off-site1 Conc.Limit
Off-site2 Conc.Limit
Kerosene Plume - CalibrationKerosene Plume - Calibration
RBCA Tool Kit for Chemical Releases, Version 2.51
RBCA SITE ASSESSMENT TIER 2 TRANSIENT DOMENICO ANALYSIS
Site Name: Stephens Exxon Completed By: C. Driscoll Job ID: 75207132
Site Location: Creston, NC Date Completed: 1-Oct-22 5 of 6
Constiuent:Naphthalene
Source Medium:Affected Groundwater
Biodegredation:None
Concentration vs. Distance from Source Time (yr)11.0 FALSE 0 Off-site1 Off-site2
(for given time)0.01 ##Residential None
Distance (ft)0 4 8 12 16 20 24 28 32 36 40 ###40 NA
t = 11.0 yr 4.4E-2 4.4E-2 4.4E-2 4.0E-2 3.3E-2 2.5E-2 1.8E-2 1.2E-2 8.4E-3 5.5E-3 3.6E-3 ###3.6E-3 NA
Steady-state 4.4E-2 4.4E-2 4.4E-2 4.4E-2 4.4E-2 4.4E-2 4.4E-2 4.4E-2 4.4E-2 4.4E-2 4.3E-2 #####4.3E-2 NA
POE Concentration Limit (mg/L)3.1E-1 NA
t = 11.0 yr
Concentration vs. Time Distance (ft)40 0.001
(for given distance from source)0 0 4.0E-3
Time (yr)0 1.1 2.2 3.3 4.4 5.5 6.6 7.7 8.8 9.9 11 11 Time to Reach
x = 40 ft 0.0E+0 0.0E+0 3.0E-11 7.4E-8 3.6E-6 3.8E-5 1.8E-4 5.2E-4 1.2E-3 2.2E-3 3.6E-3 #####Conc. Limit (yr)
Off-site1 (40 ft)0.0E+0 0.0E+0 3.0E-11 7.4E-8 3.6E-6 3.8E-5 1.8E-4 5.2E-4 1.2E-3 2.2E-3 3.6E-3 Off-site1 NA
Off-site2 (0 ft)NA NA NA NA NA NA NA NA NA NA NA Off-site2 NA
x = 40 ftConc.(mg/L)Conc.(mg/L)0.0E+0
5.0E-3
1.0E-21.5E-22.0E-2
2.5E-2
3.0E-23.5E-24.0E-2
4.5E-2
5.0E-2
0 5 10 15 20 25 30 35 40Conc. (mg/L)Distance
Steady-state
t = 11.0 yr
Off-site1 Conc.Limit
Off-site2 Conc.Limit
0.0E+0
5.0E-4
1.0E-3
1.5E-3
2.0E-3
2.5E-3
3.0E-3
3.5E-3
4.0E-3
0 2 4 6 8 10Conc. (mg/L)Time (yr)
x = 40 ft
Off-site1 (40 ft)
Off-site2 (0 ft)
Off-site1 Conc.Limit
Off-site2 Conc.Limit
Kerosene Plume - Calibration
RBCA Tool Kit for Chemical Releases, Version 2.51
RBCA SITE ASSESSMENT TIER 2 TRANSIENT DOMENICO ANALYSIS
Site Name: Stephens Exxon Completed By: C. Driscoll Job ID: 75207132
Site Location: Creston, NC Date Completed: 1-Oct-22 6 of 6
Constiuent:Trimethylbenzene, 1,2,4-
Source Medium:Affected Groundwater
Biodegredation:None
Concentration vs. Distance from Source Time (yr)11.0 FALSE 0 Off-site1 Off-site2
(for given time)0.1 ##Residential None
Distance (ft)0 4 8 12 16 20 24 28 32 36 40 ###40 NA
t = 11.0 yr 1.9E-1 1.9E-1 1.9E-1 1.9E-1 1.8E-1 1.7E-1 1.5E-1 1.2E-1 1.0E-1 8.1E-2 6.3E-2 ###6.3E-2 NA
Steady-state 1.9E-1 1.9E-1 1.9E-1 1.9E-1 1.9E-1 1.9E-1 1.9E-1 1.9E-1 1.9E-1 1.9E-1 1.9E-1 #####1.9E-1 NA
POE Concentration Limit (mg/L)7.8E-1 NA
t = 11.0 yr
Concentration vs. Time Distance (ft)40 0.01
(for given distance from source)0 0 7.0E-2
Time (yr)0 1.1 2.2 3.3 4.4 5.5 6.6 7.7 8.8 9.9 11 11 Time to Reach
x = 40 ft 0.0E+0 1.0E-13 4.4E-7 7.2E-5 8.9E-4 4.0E-3 1.0E-2 2.1E-2 3.3E-2 4.8E-2 6.3E-2 #####Conc. Limit (yr)
Off-site1 (40 ft)0.0E+0 1.0E-13 4.4E-7 7.2E-5 8.9E-4 4.0E-3 1.0E-2 2.1E-2 3.3E-2 4.8E-2 6.3E-2 Off-site1 NA
Off-site2 (0 ft)NA NA NA NA NA NA NA NA NA NA NA Off-site2 NA
x = 40 ftConc.(mg/L)Conc.(mg/L)0.0E+0
2.0E-2
4.0E-26.0E-28.0E-2
1.0E-1
1.2E-11.4E-11.6E-1
1.8E-1
2.0E-1
0 5 10 15 20 25 30 35 40Conc. (mg/L)Distance
Steady-state
t = 11.0 yr
Off-site1 Conc.Limit
Off-site2 Conc.Limit
0.0E+0
1.0E-2
2.0E-2
3.0E-2
4.0E-2
5.0E-2
6.0E-2
7.0E-2
0 2 4 6 8 10Conc. (mg/L)Time (yr)
x = 40 ft
Off-site1 (40 ft)
Off-site2 (0 ft)
Off-site1 Conc.Limit
Off-site2 Conc.Limit
Kerosene Plume - Calibration
RBCA Tool Kit for Chemical Releases, Version 2.6
##4. RBCA Evaluation Process
1. Project Information
Site Name:
Location:
Completed By:
Date:1-Oct-22 Job ID:75207132
2. Which Type of RBCA Analysis?
#####
#####
#####
3. Calculation Options
###
###
Individual Constituent Risk Goals Only
Individual and Cumulative Risk Goals 5. Commands and Options
Apply Source Depletion Algorithm
Time to Future Exposure 0 (yr)
C. Driscoll
Creston, NC
Stephens Exxon
Baseline Risks (Forward mode)
RBCA Cleanup Levels (Backward mode)
Main Screen
Affects which input data are required
Prepare Input Data Review Output
Data Complete? ( = yes, = no)
Site-Specific
Target Levels
Risk-Based
Screening
Levels
Tier Tier 2/3
RBCA Tool Kit for Chemical Releases© 2011 GSI Environmental Inc.Version 2.6
User Chemical
Database
?
Print Sheet
New Site
QuitHelp
Sav e Data
?
Set Units Print
Load Data...
Exposure Pathways
Air ParametersAir Parameters
GW Parameters
Soil ParametersSoil Parameters
Transport Models
Constituents of Concern
(COCs)
Exposure Flowchart
COC Chem. Parameters
Input Data Summary
User-Spec. COC Data...
Transient Domenico Analysis...
Baseline Risks...
Cleanup Levels...
Kerosene Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.6
#Site Name: Stephens Exxon
Location: Creston, NC
1. Groundwater Exposure Compl. By: C. Driscoll
Groundwater Ingestion/Job ID: 75207132 Date: 1-Oct-22
Surface Water Impact 3. Air Exposure
Receptor: to Outdoor Air Inhalation
On-site Off-site1 Off-site2 Receptor:
Distance:0 60 330 (ft)On-site Off-site1 Off-site2
Source Media:Distance:0 0 0 (ft)
Affected Groundwater Source Media:Construction worker
Affected Soils Leaching to Groundwater Affected Soils--Volatilization to Ambient Outdoor Air
Option:Affected Groundwater--Volatilization to Ambient Outdoor Air
Apply MCL value as ingestion RBEL (backward mode only)Affected Surface Soils--Particulates to Ambient Outdoor Air
GW Discharge to Surface Water Exposure Volatilization to Indoor Air Inhalation
Swimming Receptor:
Fish Consumption On-site Off-site1 Off-site2
Specified Water Quality Criteria Source Media:Distance:0 0 0 (ft)
Affected Soils--Volatilization to Enclosed Space
Affected Soils Leaching to GW--Volatilization to Enclosed Space
2. Surface Soil Exposure Affected Groundwater--Volatilization to Enclosed Space
Source Media:
Receptor: Direct Ingestion 4. Commands and Options
On-site Dermal Contact
Construction Worker Inhalation (vol+part)
Option: Vegetable Ingestion
Apply UK (CLEA) SGV as soil concentration limit
Combined Exposure
Volatilization and Particulates
Exposure Pathway Identification
Main Print Sheet Help
?
?
?
Exposure Flowchart
Set Units
?
Veg OptionsVeg Options
Bldg OptionsBldg Options
Exposure Factors & Target Risks
Enter CriteriaEnter Criteria
Kerosene Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.6
Site Name: Stephens Exxon Job ID: 75207132 Commands and Options
Location: Creston, NC Date: 1-Oct-22
Compl. By: C. Driscoll
Selected COCs Representative COC Concentration
Groundwater Source Zone Soil Source Zone Mole Fraction
o n in Source
n o Material
(mg/L)note (mg/kg)note (-)
Benzene 0.0E+0
Toluene 0.0E+0
Ethyl benzene 0.0E+0
Xylenes (mixed isomers)0.0E+0
Naphthalene 3.5E-3 Concentrations of COCs in MW-11
Trimethylbenzene, 1,2,4-5.5E-2 during Oct 2022 sampling event
Apply
Raoul
t's
Source Media Constituents of Concern (COCs)
COC Sort List:
Top
Bottom
MoveUAdd/Ins
Delete MoveD
Main Screen Print Help
?
??
View Chemical Parameters
Enter Site DataEnter Site Data Enter Site DataEnter Site Data
Kerosene Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.6
#Site Name: Stephens Exxon Job ID: 75207132
Location: Creston, NC Date: 1-Oct-22
1. Water-Bearing Unit Compl. By: C. Driscoll
Hydrogeology 3. Groundwater Dispersion
Groundwater Darcy velocity 1.3E+1 (ft/yr)Model:GW Ingestion
Groundwater seepage velocity 3.5E+1 (ft/yr)Off-site 1 Off-site 2 Off-site 1 Off-site 2
or Distance to GW receptors 60 330 0 0 (ft)
Hydraulic conductivity 3.5E+2 (ft/yr)
Hydraulic gradient 0.0386 (-)Longitudinal dispersivity 6 33 0 0 (ft)
Effective porosity 0.38 (-)Transverse dispersivity 1.98 10.89 0 0 (ft)
Sorption Vertical dispersivity 0.3 1.65 0 0 (ft)
Fraction organic carbon--saturated zone 0.001 (-) 4. Groundwater Discharge to Surface Water
Groundwater pH 6.7 (-)
2. Groundwater Source Zone Off-site 2
Groundwater plume width at source 75 (ft)Distance to GW/SW disharge point NA (ft)
Plume (mixing zone) thickness at source 22.74 (ft)
Plume width at GW/SW discharge (ft)
Saturated thickness 22.74 (ft)Plume thickness at GW/SW discharge (ft)
Length of source zone 147.637795 (ft)
Surface water flowrate at GW/SW discharge (ft^3/s)
5. Commands and Options
GW to Indoor Air
Site-Specific Groundwater Parameters
or
or
?
?
?
Main Screen Use/Set Default
Values
Set Units
Print Sheet
Help
?
Kerosene Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.51
RBCA SITE ASSESSMENT TIER 2 TRANSIENT DOMENICO ANALYSIS
Site Name: Stephens Exxon Completed By: C. Driscoll Job ID: 75207132
Site Location: Creston, NC Date Completed: 1-Oct-22 5 of 6
Constiuent:Naphthalene
Source Medium:Affected Groundwater
Biodegredation:None
Concentration vs. Distance from Source Time (yr)20.0 FALSE 0 Off-site1 Off-site2
(for given time)0.001 ##Residential Residential
Distance (ft)0 48 96 144 192 240 288 336 384 432 480 ###60 330
t = 20 yr 3.5E-3 3.2E-3 1.3E-3 2.9E-4 5.7E-5 1.1E-5 2.1E-6 4.0E-7 8.1E-8 1.6E-8 3.4E-9 ###2.8E-3 4.9E-7
Steady-state 3.5E-3 3.5E-3 3.0E-3 2.1E-3 1.5E-3 1.1E-3 7.8E-4 5.9E-4 4.7E-4 3.7E-4 3.1E-4 #####3.5E-3 6.1E-4
POE Concentration Limit (mg/L)3.1E-1 3.1E-1
t = 20 yr
Concentration vs. Time Distance (ft)60 0.001
(for given distance from source)0 0 3.0E-3
Time (yr)0 2 4 6 8 10 12 14 16 18 20 20 Time to Reach
x = 60 ft 0.0E+0 1.2E-9 6.5E-6 1.1E-4 4.1E-4 8.6E-4 1.4E-3 1.8E-3 2.2E-3 2.6E-3 2.8E-3 #####Conc. Limit (yr)
Off-site1 (60 ft)0.0E+0 1.2E-9 6.5E-6 1.1E-4 4.1E-4 8.6E-4 1.4E-3 1.8E-3 2.2E-3 2.6E-3 2.8E-3 Off-site1 NA
Off-site2 (330 ft)0.0E+0 0.0E+0 0.0E+0 1.4E-16 3.5E-13 4.0E-11 9.2E-10 8.7E-9 4.7E-8 1.7E-7 4.9E-7 Off-site2 NA
x = 60 ftConc.(mg/L)Conc.(mg/L)0.0E+0
5.0E-4
1.0E-3
1.5E-3
2.0E-3
2.5E-3
3.0E-3
3.5E-3
4.0E-3
0 50 100 150 200 250 300 350 400 450Conc. (mg/L)Distance
Steady-state
t = 20 yr
Off-site1 Conc.Limit
Off-site2 Conc.Limit
0.0E+0
5.0E-4
1.0E-3
1.5E-3
2.0E-3
2.5E-3
3.0E-3
0 2 4 6 8 10 12 14 16 18 20Conc. (mg/L)Time (yr)
x = 60 ft
Off-site1 (60 ft)
Off-site2 (330 ft)
Off-site1 Conc.Limit
Off-site2 Conc.Limit
Kerosene Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.51
RBCA SITE ASSESSMENT TIER 2 TRANSIENT DOMENICO ANALYSIS
Site Name: Stephens Exxon Completed By: C. Driscoll Job ID: 75207132
Site Location: Creston, NC Date Completed: 1-Oct-22 6 of 6
Constiuent:Trimethylbenzene, 1,2,4-
Source Medium:Affected Groundwater
Biodegredation:None
Concentration vs. Distance from Source Time (yr)20.0 FALSE 0 Off-site1 Off-site2
(for given time)0.01 ##Residential Residential
Distance (ft)0 48 96 144 192 240 288 336 384 432 480 ###60 330
t = 20 yr 5.5E-2 5.4E-2 3.7E-2 1.5E-2 5.1E-3 1.6E-3 5.2E-4 1.7E-4 5.5E-5 1.8E-5 6.2E-6 ###5.2E-2 1.9E-4
Steady-state 5.5E-2 5.5E-2 4.7E-2 3.3E-2 2.3E-2 1.6E-2 1.2E-2 9.2E-3 7.2E-3 5.8E-3 4.8E-3 #####5.4E-2 9.5E-3
POE Concentration Limit (mg/L)7.8E-1 7.8E-1
t = 20 yr
Concentration vs. Time Distance (ft)60 0.01
(for given distance from source)0 0 6.0E-2
Time (yr)0 2 4 6 8 10 12 14 16 18 20 20 Time to Reach
x = 60 ft 0.0E+0 7.5E-6 1.9E-3 1.0E-2 2.2E-2 3.3E-2 4.1E-2 4.6E-2 4.9E-2 5.1E-2 5.2E-2 #####Conc. Limit (yr)
Off-site1 (60 ft)0.0E+0 7.5E-6 1.9E-3 1.0E-2 2.2E-2 3.3E-2 4.1E-2 4.6E-2 4.9E-2 5.1E-2 5.2E-2 Off-site1 NA
Off-site2 (330 ft)0.0E+0 0.0E+0 4.2E-15 1.2E-10 2.0E-8 4.3E-7 3.4E-6 1.4E-5 4.3E-5 9.9E-5 1.9E-4 Off-site2 NA
x = 60 ftConc.(mg/L)Conc.(mg/L)0.0E+0
1.0E-2
2.0E-2
3.0E-2
4.0E-2
5.0E-2
6.0E-2
0 50 100 150 200 250 300 350 400 450Conc. (mg/L)Distance
Steady-state
t = 20 yr
Off-site1 Conc.Limit
Off-site2 Conc.Limit
0.0E+0
1.0E-2
2.0E-2
3.0E-2
4.0E-2
5.0E-2
6.0E-2
0 2 4 6 8 10 12 14 16 18 20Conc. (mg/L)Time (yr)
x = 60 ft
Off-site1 (60 ft)
Off-site2 (330 ft)
Off-site1 Conc.Limit
Off-site2 Conc.Limit
Kerosene Plume - ModelKerosene Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.6
RBCA SITE ASSESSMENT
1 OF 7
TIER 2 EXPOSURE CONCENTRATION AND INTAKE CALCULATION
GROUNDWATER EXPOSURE PATHWAYS o (Checked if Pathway is Complete)
SOILS : LEACHING TO
GROUNDWATER INGESTION 1) Source Medium 2) NAF Value (L/kg)3) Exposure Medium
Receptor Groundwater: POE Conc. (mg/L) (1)/(2)
Soil Conc.
On-site
(0 ft)
Off-site 1
(60 ft)
Off-site 2
(330 ft)
On-site
(0 ft)
Off-site 1
(60 ft)
Off-site 2
(330 ft)
Constituents of Concern (mg/kg)None Residential Residential None Residential Residential
Benzene
Toluene
Ethyl benzene
Xylenes (mixed isomers)
Naphthalene
Trimethylbenzene, 1,2,4-
* = Chemical with user-specified data
NOTE: NAF = Natural attenuation factor POE = Point of exposure
Site Name: Stephens Exxon Date Completed: 1-Oct-22
Site Location: Creston, NC Job ID: 75207132
Completed By: C. Driscoll
RBCA Tool Kit for Chemical Releases, Version 2.6
RBCA SITE ASSESSMENT
2 OF 7
TIER 2 EXPOSURE CONCENTRATION AND INTAKE CALCULATION
GROUNDWATER EXPOSURE PATHWAYS
SOILS : LEACHING TO
GROUNDWATER INGESTION (cont'd)4) Exposure Multiplier 5) Average Daily Intake Rate
(IRxEFxED)/(BWxAT) (L/kg-day)(mg/kg/day) (3) x (4)
On-site
(0 ft)
Off-site 1
(60 ft)
Off-site 2
(330 ft)
On-site
(0 ft)
Off-site 1
(60 ft)
Off-site 2
(330 ft)
Constituents of Concern None Residential Residential None Residential Residential
Benzene
Toluene
Ethyl benzene
Xylenes (mixed isomers)
Naphthalene
Trimethylbenzene, 1,2,4-
* = Chemical with user-specified data
NOTE: AT = Averaging time (days)ED = Exposure duration (yr)IR = Ingestion rate (mg/day)
BW = Body weight (kg)EF = Exposure frequency (days/yr)
Site Name: Stephens Exxon Completed By: C. Driscoll Job ID: 75207132
Site Location: Creston, NC Date Completed: 1-Oct-22
Kerosene Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.6
RBCA SITE ASSESSMENT
3 OF 7
TIER 2 EXPOSURE CONCENTRATION AND INTAKE CALCULATION
GROUNDWATER EXPOSURE PATHWAYS n (Checked if Pathway is Complete)
GROUNDWATER: INGESTION
1) Source Medium 2) NAF Value (unitless)3) Exposure Medium
Receptor Groundwater: POE Conc. (mg/L) (1)/(2)
Groundwater
On-site
(0 ft)
Off-site 1
(60 ft)
Off-site 2
(330 ft)
On-site
(0 ft)
Off-site 1
(60 ft)
Off-site 2
(330 ft)
Constituents of Concern Conc. (mg/L)None Residential Residential None Residential Residential
Benzene 0.0E+0 1.0E+0 5.7E+0 0.0E+0 0.0E+0
Toluene 0.0E+0 1.0E+0 5.7E+0 0.0E+0 0.0E+0
Ethyl benzene 0.0E+0 1.0E+0 5.7E+0 0.0E+0 0.0E+0
Xylenes (mixed isomers)0.0E+0 1.0E+0 5.7E+0 0.0E+0 0.0E+0
Naphthalene 3.5E-3 1.0E+0 5.7E+0 3.5E-3 6.1E-4
Trimethylbenzene, 1,2,4-5.5E-2 1.0E+0 5.7E+0 5.4E-2 9.5E-3
NOTE: NAF = Natural attenuation factor POE = Point of exposure
Site Name: Stephens Exxon Date Completed: 1-Oct-22
Site Location: Creston, NC Job ID: 75207132
Completed By: C. Driscoll
Kerosene Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.6
RBCA SITE ASSESSMENT
4 OF 7
TIER 2 EXPOSURE CONCENTRATION AND INTAKE CALCULATION
GROUNDWATER EXPOSURE PATHWAYS
GROUNDWATER INGESTION (cont'd)
4) Exposure Multiplier 5) Average Daily Intake Rate
(IRxEFxED)/(BWxAT) (L/kg/day)(mg/kg/day) (3) x (4)
On-site
(0 ft)
Off-site 1
(60 ft)
Off-site 2
(330 ft)
On-site
(0 ft)
Off-site 1
(60 ft)
Off-site 2
(330 ft)
Constituents of Concern None Residential Residential None Residential Residential
Benzene 1.5E-2 1.5E-2 0.0E+0 0.0E+0
Toluene 6.4E-2 6.4E-2 0.0E+0 0.0E+0
Ethyl benzene 6.4E-2 6.4E-2 0.0E+0 0.0E+0
Xylenes (mixed isomers)6.4E-2 6.4E-2 0.0E+0 0.0E+0
Naphthalene 6.4E-2 6.4E-2 2.2E-4 3.9E-5
Trimethylbenzene, 1,2,4-6.4E-2 6.4E-2 3.5E-3 6.1E-4
* = Chemical with user-specified data
NOTE: AT = Averaging time (days)ED = Exposure duration (yr)IR = Ingestion rate (mg/day)
BW = Body weight (kg)EF = Exposure frequency (days/yr)
Site Name: Stephens Exxon Completed By: C. Driscoll Job ID: 75207132
Site Location: Creston, NC Date Completed: 1-Oct-22
Kerosene Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.6
RBCA SITE ASSESSMENT
5 OF 7
TIER 2 EXPOSURE CONCENTRATION AND INTAKE CALCULATION
GROUNDWATER EXPOSURE PATHWAYS
MAXIMUM PATHWAY INTAKE (mg/kg/day)
(Maximum intake of active pathways
soil leaching & groundwater routes.)
On-site
(0 ft)
Off-site 1
(60 ft)
Off-site 2
(330 ft)
Constituents of Concern None Residential Residential
Benzene
Toluene
Ethyl benzene
Xylenes (mixed isomers)
Naphthalene 2.2E-4 3.9E-5
Trimethylbenzene, 1,2,4-3.5E-3 6.1E-4
* = Chemical with user-specified data
Site Name: Stephens Exxon Date Completed: 1-Oct-22
Site Location: Creston, NC Job ID: 75207132
Completed By: C. Driscoll
Kerosene Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.6
RBCA SITE ASSESSMENT
6 OF 7
TIER 2 PATHWAY RISK CALCULATION
GROUNDWATER EXPOSURE PATHWAYS n (Checked if Pathway is Complete)
CARCINOGENIC RISK
(1) Is (2) Maximum Carcinogenic (3) Oral (4) Individual COC
Carcinogenic Intake Rate (mg/kg/day)Slope Factor Risk (2) x (3)
On-site
(0 ft)
Off-site 1
(60 ft)
Off-site 2
(330 ft)
(mg/kg-day)^-1 On-site
(0 ft)
Off-site 1
(60 ft)
Off-site 2
(330 ft)
Constituents of Concern None Residential Residential None Residential Residential
Benzene TRUE 1.5E-2
Toluene FALSE -
Ethyl benzene FALSE -
Xylenes (mixed isomers)FALSE -
Naphthalene FALSE -
Trimethylbenzene, 1,2,4-FALSE -
Total Pathway Carcinogenic Risk =
Site Name: Stephens Exxon Date Completed: 1-Oct-22
Site Location: Creston, NC Job ID: 75207132
Completed By: C. Driscoll
Kerosene Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.6
RBCA SITE ASSESSMENT
7 OF 7
TIER 2 PATHWAY RISK CALCULATION
GROUNDWATER EXPOSURE PATHWAYS n (Checked if Pathway is Complete)
TOXIC EFFECTS
(5) Maximum Toxicant (6) Oral (7) Individual COC
Intake Rate (mg/kg/day)Reference Hazard Quotient (5) / (6)
On-site
(0 ft)
Off-site 1
(60 ft)
Off-site 2
(330 ft)
Dose
(mg/kg/day)
On-site
(0 ft)
Off-site 1
(60 ft)
Off-site 2
(330 ft)
Constituents of Concern None Residential Residential None Residential Residential
Benzene 0.0E+0 0.0E+0 4.0E-3 0.0E+0 0.0E+0
Toluene 8.0E-2
Ethyl benzene 1.0E-1
Xylenes (mixed isomers)2.0E-1
Naphthalene 2.2E-4 3.9E-5 2.0E-2 1.1E-2 2.0E-3
Trimethylbenzene, 1,2,4-3.5E-3 6.1E-4 5.0E-2 6.9E-2 1.2E-2
Total Pathway Hazard Index =8.0E-2 1.4E-2
Site Name: Stephens Exxon Date Completed: 1-Oct-22
Site Location: Creston, NC Job ID: 75207132
Completed By: C. Driscoll
Kerosene Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.6
#4. RBCA Evaluation Process
1. Project Information
Site Name:
Location:
Completed By:
Date:1-Oct-22 Job ID:75207132
2. Which Type of RBCA Analysis?
####
####
####
3. Calculation Options
###
###
Individual Constituent Risk Goals Only
Individual and Cumulative Risk Goals 5. Commands and Options
Apply Source Depletion Algorithm
Time to Future Exposure 0 (yr)
C. Driscoll
Creston, NC
Stephens Exxon
Baseline Risks (Forward mode)
RBCA Cleanup Levels (Backward mode)
Main Screen
Affects which input data are required
Prepare Input Data Review Output
Data Complete? ( = yes, = no)
Site-Specific
Target Levels
Risk-Based
Screening
Levels
Tie Tier 2/3
RBCA Tool Kit for Chemical Releases
© 2011 GSI Environmental Inc.Version 2.6
User Chemical
Database
?
Print Sheet
New Site
QuitHelp
Save
?
Set Units Print
Load Data...
Exposure Pathways
Air ParametersAir Parameters
GW Parameters
Soil ParametersSoil Parameters
Transport Models
Constituents of Concern
(COCs)
Exposure Flowchart
COC Chem. Parameters
Input Data SummaryInput Data Summary
User-Spec. COC Data...
Transient Domenico Analysis...Transient Domenico Analysis...
Baseline Risks...Baseline Risks...
Cleanup Levels...Cleanup Levels...
Gasoline Plume - Calibration
RBCA Tool Kit for Chemical Releases, Version 2.6
#Site Name: Stephens Exxon
Location: Creston, NC
1. Groundwater Exposure Compl. By: C. Driscoll
Groundwater Ingestion/Job ID: 75207132 Date: 1-Oct-22
Surface Water Impact 3. Air Exposure
Receptor: to Outdoor Air Inhalation
On-site Off-site1 Off-site2 Receptor:
Distance:0 130 0 (ft)On-site Off-site1 Off-site2
Source Media:Distance:0 0 0 (ft)
Affected Groundwater Source Media:Construction worker
Affected Soils Leaching to Groundwater Affected Soils--Volatilization to Ambient Outdoor Air
Option:Affected Groundwater--Volatilization to Ambient Outdoor Air
Apply MCL value as ingestion RBEL (backward mode only)Affected Surface Soils--Particulates to Ambient Outdoor Air
GW Discharge to Surface Water Exposure Volatilization to Indoor Air Inhalation
Swimming Receptor:
Fish Consumption On-site Off-site1 Off-site2
Specified Water Quality Criteria Source Media:Distance:0 0 0 (ft)
Affected Soils--Volatilization to Enclosed Space
Affected Soils Leaching to GW--Volatilization to Enclosed Space
2. Surface Soil Exposure Affected Groundwater--Volatilization to Enclosed Space
Source Media:
Receptor: Direct Ingestion 4. Commands and Options
On-site Dermal Contact
Construction Worker Inhalation (vol+part)
Option: Vegetable Ingestion
Apply UK (CLEA) SGV as soil concentration limit
Combined Exposure
Volatilization and Particulates
Exposure Pathway Identification
Main Print Sheet Help
?
?
?
Exposure Flowchart
Set Units
?
Veg OptionsVeg Options
Bldg OptionsBldg Options
Exposure Factors & Target Risks
Enter CriteriaEnter Criteria
Gasoline Plume - Calibration
RBCA Tool Kit for Chemical Releases, Version 2.51
Site Name: Stephens Exxon Job ID: 75207132 Commands and Options
Location: Creston, NC Date: 1-Oct-22
Compl. By: C. Driscoll
Selected COCs Representative COC Concentration
Groundwater Source Zone Soil Source Zone Mole Fraction
o n in Source
n o Material
(mg/L)note (mg/kg)note (-)
Benzene 4.1E-1 Concentrations of COCs in MW-1
Toluene 6.4E-1 during July 1997 sampling event
Ethyl benzene 2.5E-1
Xylenes (mixed isomers)8.4E-1
Apply
Raoul
t's
Source Media Constituents of Concern (COCs)
COC Sort List:
Top
Bottom
MoveUAdd/Ins
Delete MoveD
Main Screen Print Help
?
??
View Chemical Parameters
Enter Site DataEnter Site Data Enter Site DataEnter Site Data
Gasoline Plume - Calibration
RBCA Tool Kit for Chemical Releases, Version 2.6
##Site Name: Stephens Exxon Job ID: 75207132
Location: Creston, NC Date: 1-Oct-22
1. Vertical Transport, Surface Soil Column Compl. By: C. Driscoll
Outdoor Air Volatilization Factors 3. Groundwater Dilution Attenuation Factor
Surface soil volatilization model only
Combination surface soil/Johnson & Ettinger models
Thickness of surface soil zone 3.28 (ft)Calculate DAF using Domenico Model
User-specified VF from other model Domenico equation with dispersion only (no biodegradation)
Indoor Air Volatilization Factors Domenico equation first-order decay
Johnson & Ettinger model for soil and groundwater volatilization Modified Domenico equation using
Johnson & Ettinger for soil, Mass Flux model for groundwater electron acceptor superposition
User-specified VF from other model Biodegradation Capacity NC (mg/L)
Soil-to-Groundwater Leaching Factor — or —
ASTM Model User-Specified DAF Values
Apply Soil Attenuation Model (SAM)DAF values from other model or site data
Allow first-order biodecay
User-specified LF from other model 4. Chemical Decay and Source Depletion
Modeling Options
Disable Mass Balance Limit
Apply Dual Equilibrium Desorption Model
2. Lateral Air Dispersion Factor 5. Commands and Options
3-D Gaussian dispersion model Off-site 1 Off-site 2
User-Specified ADF 1.00E+0 1.00E+0 (-)
Transport Modeling Options
C
Enter VF ValuesEnter VF Values
Print SheetMain Screen Help
?
?
ASTM ModelASTM Model
?
Enter Source MassEnter Source Mass
Enter Decay RatesEnter Decay Rates
Enter DAF ValuesEnter DAF Values
Enter Site DataEnter Site Data
Enter Decay RatesEnter Decay Rates
Enter Decay RatesEnter Decay Rates
Enter LF ValuesEnter LF Values
Enter VF ValuesEnter VF Values
?
?
?
?
C
Gasoline Plume - Calibration
RBCA Tool Kit for Chemical Releases, Version 2.6
#Site Name: Stephens Exxon Job ID: 75207132
Location: Creston, NC Date: 1-Oct-22
1. Water-Bearing Unit Compl. By: C. Driscoll
Hydrogeology 3. Groundwater Dispersion
Groundwater Darcy velocity 1.3E+1 (ft/yr)Model:GW Ingestion
Groundwater seepage velocity 3.5E+1 (ft/yr)Off-site 1 Off-site 2 Off-site 1 Off-site 2
or Distance to GW receptors 130 0 0 0 (ft)
Hydraulic conductivity 3.5E+2 (ft/yr)
Hydraulic gradient 0.0386 (-)Longitudinal dispersivity 13 0 0 0 (ft)
Effective porosity 0.38 (-)Transverse dispersivity 4.29 0 0 0 (ft)
Sorption Vertical dispersivity 0.65 0 0 0 (ft)
Fraction organic carbon--saturated zone 0.001 (-) 4. Groundwater Discharge to Surface Water
Groundwater pH 6.7 (-)
2. Groundwater Source Zone Off-site 2
Groundwater plume width at source 75 (ft)Distance to GW/SW disharge point NA (ft)
Plume (mixing zone) thickness at source 22.74 (ft)
Plume width at GW/SW discharge (ft)
Saturated thickness 22.74 (ft)Plume thickness at GW/SW discharge (ft)
Length of source zone 147.637795 (ft)
Surface water flowrate at GW/SW discharge (ft^3/s)
5. Commands and Options
GW to Indoor Air
Site-Specific Groundwater Parameters
or
or
?
?
?
Main Screen Use/Set Default
Values
Set Units
Print Sheet
Help
?
Gasoline Plume - Calibration
RBCA Tool Kit for Chemical Releases, Version 2.51
RBCA SITE ASSESSMENT TIER 2 TRANSIENT DOMENICO ANALYSIS
Site Name: Stephens Exxon Completed By: C. Driscoll Job ID: 75207132
Site Location: Creston, NC Date Completed: 1-Oct-22 1 of 4
Constiuent:Benzene
Source Medium:Affected Groundwater
Biodegredation:None
Concentration vs. Distance from Source Time (yr)25.0 FALSE 1 Off-site1 Off-site2
(for given time)0.1 ##Residential None
Distance (ft)0 7.5 15 22.5 30 37.5 45 52.5 60 67.5 75 ###130 NA
t = 25 yr 4.1E-1 4.1E-1 4.1E-1 4.1E-1 4.1E-1 4.1E-1 4.1E-1 4.1E-1 4.0E-1 4.0E-1 3.9E-1 ###2.8E-1 NA
Steady-state 4.1E-1 4.1E-1 4.1E-1 4.1E-1 4.1E-1 4.1E-1 4.1E-1 4.1E-1 4.0E-1 4.0E-1 3.9E-1 #####2.8E-1 NA
POE Concentration Limit (mg/L)4.5E-2 NA
t = 25 yr
Concentration vs. Time Distance (ft)75 0.1
(for given distance from source)0 0 3.0E-1
Time (yr)0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 3 Time to Reach
x = 75 ft 0.0E+0 2.8E-10 3.3E-5 1.6E-3 1.1E-2 3.2E-2 6.5E-2 1.0E-1 1.5E-1 1.9E-1 2.2E-1 #####Conc. Limit (yr)
Off-site1 (130 ft)0.0E+0 0.0E+0 4.5E-9 3.9E-6 1.1E-4 8.4E-4 3.2E-3 8.0E-3 1.6E-2 2.7E-2 4.0E-2 Off-site1 3.1
Off-site2 (0 ft)NA NA NA NA NA NA NA NA NA NA NA Off-site2 NA
x = 75 ftConc.(mg/L)Conc.(mg/L)0.0E+0
5.0E-2
1.0E-11.5E-12.0E-1
2.5E-1
3.0E-13.5E-14.0E-1
4.5E-1
5.0E-1
0 10 20 30 40 50 60 70Conc. (mg/L)Distance
Steady-state
t = 25 yr
Off-site1 Conc.Limit
Off-site2 Conc.Limit
0.0E+0
5.0E-2
1.0E-1
1.5E-1
2.0E-1
2.5E-1
3.0E-1
0 0.5 1 1.5 2 2.5 3Conc. (mg/L)Time (yr)
x = 75 ft
Off-site1 (130 ft)
Off-site2 (0 ft)
Off-site1 Conc.Limit
Off-site2 Conc.Limit
Gasoline Plume - Calibration
RBCA Tool Kit for Chemical Releases, Version 2.51
RBCA SITE ASSESSMENT TIER 2 TRANSIENT DOMENICO ANALYSIS
Site Name: Stephens Exxon Completed By: C. Driscoll Job ID: 75207132
Site Location: Creston, NC Date Completed: 1-Oct-22 2 of 4
Constiuent:Toluene
Source Medium:Affected Groundwater
Biodegredation:None
Concentration vs. Distance from Source Time (yr)25.0 FALSE 1 Off-site1 Off-site2
(for given time)0.1 ##Residential None
Distance (ft)0 7.5 15 22.5 30 37.5 45 52.5 60 67.5 75 ###130 NA
t = 25 yr 6.4E-1 6.4E-1 6.4E-1 6.4E-1 6.4E-1 6.4E-1 6.4E-1 6.4E-1 6.3E-1 6.2E-1 6.1E-1 ###4.4E-1 NA
Steady-state 6.4E-1 6.4E-1 6.4E-1 6.4E-1 6.4E-1 6.4E-1 6.4E-1 6.4E-1 6.3E-1 6.2E-1 6.1E-1 #####4.4E-1 NA
POE Concentration Limit (mg/L)1.3E+0 NA
t = 25 yr
Concentration vs. Time Distance (ft)75 0.1
(for given distance from source)0 0 3.0E-1
Time (yr)0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 3 Time to Reach
x = 75 ft 0.0E+0 1.1E-12 2.7E-6 3.5E-4 3.9E-3 1.6E-2 4.1E-2 7.8E-2 1.2E-1 1.7E-1 2.3E-1 #####Conc. Limit (yr)
Off-site1 (130 ft)0.0E+0 0.0E+0 4.1E-11 1.9E-7 1.3E-5 1.7E-4 9.1E-4 3.0E-3 7.3E-3 1.4E-2 2.5E-2 Off-site1 NA
Off-site2 (0 ft)NA NA NA NA NA NA NA NA NA NA NA Off-site2 NA
x = 75 ftConc.(mg/L)Conc.(mg/L)0.0E+0
1.0E-1
2.0E-1
3.0E-1
4.0E-1
5.0E-1
6.0E-1
7.0E-1
0 10 20 30 40 50 60 70Conc. (mg/L)Distance
Steady-state
t = 25 yr
Off-site1 Conc.Limit
Off-site2 Conc.Limit
0.0E+0
5.0E-2
1.0E-1
1.5E-1
2.0E-1
2.5E-1
3.0E-1
0 0.5 1 1.5 2 2.5 3Conc. (mg/L)Time (yr)
x = 75 ft
Off-site1 (130 ft)
Off-site2 (0 ft)
Off-site1 Conc.Limit
Off-site2 Conc.Limit
Gasoline Plume - Calibration
RBCA Tool Kit for Chemical Releases, Version 2.51
RBCA SITE ASSESSMENT TIER 2 TRANSIENT DOMENICO ANALYSIS
Site Name: Stephens Exxon Completed By: C. Driscoll Job ID: 75207132
Site Location: Creston, NC Date Completed: 1-Oct-22 3 of 4
Constiuent:Ethyl benzene
Source Medium:Affected Groundwater
Biodegredation:None
Concentration vs. Distance from Source Time (yr)25.0 FALSE 0 Off-site1 Off-site2
(for given time)0.1 ##Residential None
Distance (ft)0 7.5 15 22.5 30 37.5 45 52.5 60 67.5 75 ###130 NA
t = 25 yr 2.5E-1 2.5E-1 2.5E-1 2.5E-1 2.5E-1 2.5E-1 2.5E-1 2.5E-1 2.5E-1 2.4E-1 2.4E-1 ###1.7E-1 NA
Steady-state 2.5E-1 2.5E-1 2.5E-1 2.5E-1 2.5E-1 2.5E-1 2.5E-1 2.5E-1 2.5E-1 2.4E-1 2.4E-1 #####1.7E-1 NA
POE Concentration Limit (mg/L)1.6E+0 NA
t = 25 yr
Concentration vs. Time Distance (ft)75 0.01
(for given distance from source)0 0 6.0E-2
Time (yr)0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 3 Time to Reach
x = 75 ft 0.0E+0 2.6E-15 7.8E-8 2.5E-5 4.3E-4 2.3E-3 7.1E-3 1.5E-2 2.7E-2 4.2E-2 5.8E-2 #####Conc. Limit (yr)
Off-site1 (130 ft)0.0E+0 0.0E+0 1.8E-13 3.8E-9 5.6E-7 1.1E-5 8.1E-5 3.3E-4 9.5E-4 2.1E-3 4.1E-3 Off-site1 NA
Off-site2 (0 ft)NA NA NA NA NA NA NA NA NA NA NA Off-site2 NA
x = 75 ftConc.(mg/L)Conc.(mg/L)0.0E+0
5.0E-2
1.0E-1
1.5E-1
2.0E-1
2.5E-1
3.0E-1
0 10 20 30 40 50 60 70Conc. (mg/L)Distance
Steady-state
t = 25 yr
Off-site1 Conc.Limit
Off-site2 Conc.Limit
0.0E+0
1.0E-2
2.0E-2
3.0E-2
4.0E-2
5.0E-2
6.0E-2
0 0.5 1 1.5 2 2.5 3Conc. (mg/L)Time (yr)
x = 75 ft
Off-site1 (130 ft)
Off-site2 (0 ft)
Off-site1 Conc.Limit
Off-site2 Conc.Limit
Gasoline Plume - Calibration
RBCA Tool Kit for Chemical Releases, Version 2.51
RBCA SITE ASSESSMENT TIER 2 TRANSIENT DOMENICO ANALYSIS
Site Name: Stephens Exxon Completed By: C. Driscoll Job ID: 75207132
Site Location: Creston, NC Date Completed: 1-Oct-22 4 of 4
Constiuent:Xylenes (mixed isomers)
Source Medium:Affected Groundwater
Biodegredation:None
Concentration vs. Distance from Source Time (yr)25.0 FALSE 1 Off-site1 Off-site2
(for given time)0.1 ##Residential None
Distance (ft)0 7.5 15 22.5 30 37.5 45 52.5 60 67.5 75 ###130 NA
t = 25 yr 8.4E-1 8.4E-1 8.4E-1 8.4E-1 8.4E-1 8.4E-1 8.4E-1 8.4E-1 8.3E-1 8.2E-1 8.0E-1 ###5.7E-1 NA
Steady-state 8.4E-1 8.4E-1 8.4E-1 8.4E-1 8.4E-1 8.4E-1 8.4E-1 8.4E-1 8.3E-1 8.2E-1 8.0E-1 #####5.7E-1 NA
POE Concentration Limit (mg/L)3.1E+0 NA
t = 25 yr
Concentration vs. Time Distance (ft)75 0.1
(for given distance from source)0 0 2.0E-1
Time (yr)0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 3 Time to Reach
x = 75 ft 0.0E+0 4.9E-16 6.2E-8 3.1E-5 7.0E-4 4.5E-3 1.5E-2 3.5E-2 6.6E-2 1.1E-1 1.5E-1 #####Conc. Limit (yr)
Off-site1 (130 ft)0.0E+0 0.0E+0 5.0E-14 2.4E-9 5.4E-7 1.4E-5 1.2E-4 5.5E-4 1.7E-3 4.2E-3 8.5E-3 Off-site1 NA
Off-site2 (0 ft)NA NA NA NA NA NA NA NA NA NA NA Off-site2 NA
x = 75 ftConc.(mg/L)Conc.(mg/L)0.0E+0
1.0E-1
2.0E-1
3.0E-1
4.0E-1
5.0E-1
6.0E-1
7.0E-1
8.0E-1
9.0E-1
0 10 20 30 40 50 60 70Conc. (mg/L)Distance
Steady-state
t = 25 yr
Off-site1 Conc.Limit
Off-site2 Conc.Limit
0.0E+0
5.0E-2
1.0E-1
1.5E-1
2.0E-1
0 0.5 1 1.5 2 2.5 3Conc. (mg/L)Time (yr)
x = 75 ft
Off-site1 (130 ft)
Off-site2 (0 ft)
Off-site1 Conc.Limit
Off-site2 Conc.Limit
Gasoline Plume - Calibration
RBCA Tool Kit for Chemical Releases, Version 2.6
#4. RBCA Evaluation Process
1. Project Information
Site Name:
Location:
Completed By:
Date:1-Oct-22 Job ID:75207132
2. Which Type of RBCA Analysis?
####
####
####
3. Calculation Options
###
###
Individual Constituent Risk Goals Only
Individual and Cumulative Risk Goals 5. Commands and Options
Apply Source Depletion Algorithm
Time to Future Exposure 0 (yr)
C. Driscoll
Creston, NC
Stephens Exxon
Baseline Risks (Forward mode)
RBCA Cleanup Levels (Backward mode)
Main Screen
Affects which input data are required
Prepare Input Data Review Output
Data Complete? ( = yes, = no)
Site-Specific
Target Levels
Risk-Based
Screening
Levels
Tier 1 Tier 2/3
RBCA Tool Kit for Chemical Releases
© 2011 GSI Environmental Inc.Version 2.6
User Chemical
Database
?
Print Sheet
New Site
QuitHelp
Save Data As...
?
Set Units Print Report
Load Data...
Exposure Pathways
Air ParametersAir Parameters
GW Parameters
Soil ParametersSoil Parameters
Transport Models
Constituents of Concern
(COCs)
Exposure Flowchart
COC Chem. Parameters
Input Data Summary
User-Spec. COC Data...
Transient Domenico Analysis...
Baseline Risks...
Cleanup Levels...
Gasoline Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.6
#Site Name: Stephens Exxon
Location: Creston, NC
1. Groundwater Exposure Compl. By: C. Driscoll
Groundwater Ingestion/Job ID: 75207132 Date: 1-Oct-22
Surface Water Impact 3. Air Exposure
Receptor: to Outdoor Air Inhalation
On-site Off-site1 Off-site2 Receptor:
Distance:0 175 260 (ft)On-site Off-site1 Off-site2
Source Media:Distance:0 0 0 (ft)
Affected Groundwater Source Media:Construction worker
Affected Soils Leaching to Groundwater Affected Soils--Volatilization to Ambient Outdoor Air
Option:Affected Groundwater--Volatilization to Ambient Outdoor Air
Apply MCL value as ingestion RBEL (backward mode only)Affected Surface Soils--Particulates to Ambient Outdoor Air
GW Discharge to Surface Water Exposure Volatilization to Indoor Air Inhalation
Swimming Receptor:
Fish Consumption On-site Off-site1 Off-site2
Specified Water Quality Criteria Source Media:Distance:0 0 0 (ft)
Affected Soils--Volatilization to Enclosed Space
Affected Soils Leaching to GW--Volatilization to Enclosed Space
2. Surface Soil Exposure Affected Groundwater--Volatilization to Enclosed Space
Source Media:
Receptor: Direct Ingestion 4. Commands and Options
On-site Dermal Contact
Construction Worker Inhalation (vol+part)
Option: Vegetable Ingestion
Apply UK (CLEA) SGV as soil concentration limit
Combined Exposure
Volatilization and Particulates
Exposure Pathway Identification
Main Screen Print Sheet Help
?
?
?
Exposure Flowchart
Set Units
?
Veg OptionsVeg Options
Bldg OptionsBldg Options
Exposure Factors & Target Risks
Enter CriteriaEnter Criteria
Gasoline Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.51
Site Name: Stephens Exxon Job ID: 75207132 Commands and Options
Location: Creston, NC Date: 1-Oct-22
Compl. By: C. Driscoll
Selected COCs Representative COC Concentration
Groundwater Source Zone Soil Source Zone Mole Fraction
o n in Source
n o Material
(mg/L)note (mg/kg)note (-)
Benzene 0.0E+0 Concentrations of COCs in MW-15
Toluene 1.9E-2 during Oct 2022 sampling event
Ethyl benzene 1.4E-1
Xylenes (mixed isomers)2.7E-1
Naphthalene 0.0E+0
Trimethylbenzene, 1,2,4-1.3E-1
Apply
Raoult's
Law
Source Media Constituents of Concern (COCs)
COC Select:Sort List:
Top
Bottom
MoveUpAdd/Insert
Delete MoveDown
Main Screen Print Sheet Help
?
??
View Chemical Parameters
Enter Site DataEnter Site Data Enter Site DataEnter Site Data
Gasoline Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.6
##Site Name: Stephens Exxon Job ID: 75207132
Location: Creston, NC Date: 1-Oct-22
1. Vertical Transport, Surface Soil Column Compl. By: C. Driscoll
Outdoor Air Volatilization Factors 3. Groundwater Dilution Attenuation Factor
Surface soil volatilization model only
Combination surface soil/Johnson & Ettinger models
Thickness of surface soil zone 3.28 (ft)Calculate DAF using Domenico Model
User-specified VF from other model Domenico equation with dispersion only (no biodegradation)
Indoor Air Volatilization Factors Domenico equation first-order decay
Johnson & Ettinger model for soil and groundwater volatilization Modified Domenico equation using
Johnson & Ettinger for soil, Mass Flux model for groundwater electron acceptor superposition
User-specified VF from other model Biodegradation Capacity NC (mg/L)
Soil-to-Groundwater Leaching Factor — or —
ASTM Model User-Specified DAF Values
Apply Soil Attenuation Model (SAM)DAF values from other model or site data
Allow first-order biodecay
User-specified LF from other model 4. Chemical Decay and Source Depletion
Modeling Options
Disable Mass Balance Limit
Apply Dual Equilibrium Desorption Model
2. Lateral Air Dispersion Factor 5. Commands and Options
3-D Gaussian dispersion model Off-site 1 Off-site 2
User-Specified ADF 1.00E+0 1.00E+0 (-)
Transport Modeling Options
C
Enter VF ValuesEnter VF Values
Print SheetMain Screen Help
?
?
ASTM ModelASTM Model
?
Enter Source MassEnter Source Mass
Enter Decay RatesEnter Decay Rates
Enter DAF ValuesEnter DAF Values
Enter Site DataEnter Site Data
Enter Decay RatesEnter Decay Rates
Enter Decay RatesEnter Decay Rates
Enter LF ValuesEnter LF Values
Enter VF ValuesEnter VF Values
?
?
?
?
C
Gasoline Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.6
#Site Name: Stephens Exxon Job ID: 75207132
Location: Creston, NC Date: 1-Oct-22
1. Water-Bearing Unit Compl. By: C. Driscoll
Hydrogeology 3. Groundwater Dispersion
Groundwater Darcy velocity 1.3E+1 (ft/yr)Model:GW Ingestion
Groundwater seepage velocity 3.5E+1 (ft/yr)Off-site 1 Off-site 2 Off-site 1 Off-site 2
or Distance to GW receptors 175 260 0 0 (ft)
Hydraulic conductivity 3.5E+2 (ft/yr)
Hydraulic gradient 0.0386 (-)Longitudinal dispersivity 17.5 26 0 0 (ft)
Effective porosity 0.38 (-)Transverse dispersivity 5.775 8.58 0 0 (ft)
Sorption Vertical dispersivity 0.875 1.3 0 0 (ft)
Fraction organic carbon--saturated zone 0.001 (-) 4. Groundwater Discharge to Surface Water
Groundwater pH 6.7 (-)
2. Groundwater Source Zone Off-site 2
Groundwater plume width at source 75 (ft)Distance to GW/SW disharge point NA (ft)
Plume (mixing zone) thickness at source 22.74 (ft)
Plume width at GW/SW discharge (ft)
Saturated thickness 22.74 (ft)Plume thickness at GW/SW discharge (ft)
Length of source zone 147.637795 (ft)
Surface water flowrate at GW/SW discharge (ft^3/s)
5. Commands and Options
GW to Indoor Air
Site-Specific Groundwater Parameters
or
or
?
?
?
Main Screen Use/Set Default
Values
Set Units
Print Sheet
Help
?
Gasoline Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.51
RBCA SITE ASSESSMENT TIER 2 TRANSIENT DOMENICO ANALYSIS
Site Name: Stephens Exxon Completed By: C. Driscoll Job ID: 75207132
Site Location: Creston, NC Date Completed: 1-Oct-22 2 of 6
Constiuent:Toluene
Source Medium:Affected Groundwater
Biodegredation:None
Concentration vs. Distance from Source Time (yr)20.0 FALSE 0 Off-site1 Off-site2
(for given time)0.01 ##Residential Residential
Distance (ft)0 48 96 144 192 240 288 336 384 432 480 ###175 260
t = 20 yr 1.9E-2 1.9E-2 1.6E-2 1.1E-2 7.7E-3 5.1E-3 3.4E-3 2.3E-3 1.5E-3 1.0E-3 6.7E-4 ###8.9E-3 4.3E-3
Steady-state 1.9E-2 1.9E-2 1.6E-2 1.1E-2 7.9E-3 5.6E-3 4.2E-3 3.2E-3 2.5E-3 2.0E-3 1.6E-3 #####9.0E-3 4.9E-3
POE Concentration Limit (mg/L)1.3E+0 1.3E+0
t = 20 yr
Concentration vs. Time Distance (ft)217.5 0.001
(for given distance from source)0 0 1.0E-2
Time (yr)0 3 6 9 12 15 18 21 24 27 30 30 Time to Reach
x = 217.5 ft 0.0E+0 1.3E-5 8.0E-4 2.6E-3 4.3E-3 5.4E-3 6.0E-3 6.3E-3 6.4E-3 6.5E-3 6.6E-3 #####Conc. Limit (yr)
Off-site1 (175 ft)0.0E+0 9.4E-5 2.3E-3 5.4E-3 7.3E-3 8.3E-3 8.7E-3 8.9E-3 9.0E-3 9.0E-3 9.0E-3 Off-site1 NA
Off-site2 (260 ft)0.0E+0 1.9E-6 2.8E-4 1.3E-3 2.5E-3 3.4E-3 4.0E-3 4.4E-3 4.7E-3 4.8E-3 4.9E-3 Off-site2 NA
x = 217.5 ftConc.(mg/L)Conc.(mg/L)0.0E+0
2.0E-3
4.0E-36.0E-38.0E-3
1.0E-2
1.2E-21.4E-21.6E-2
1.8E-2
2.0E-2
0 50 100 150 200 250 300 350 400 450Conc. (mg/L)Distance
Steady-state
t = 20 yr
Off-site1 Conc.Limit
Off-site2 Conc.Limit
0.0E+0
2.0E-3
4.0E-3
6.0E-3
8.0E-3
1.0E-2
0 5 10 15 20 25 30Conc. (mg/L)Time (yr)
x = 217.5 ft
Off-site1 (175 ft)
Off-site2 (260 ft)
Off-site1 Conc.Limit
Off-site2 Conc.Limit
Gasoline Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.51
RBCA SITE ASSESSMENT TIER 2 TRANSIENT DOMENICO ANALYSIS
Site Name: Stephens Exxon Completed By: C. Driscoll Job ID: 75207132
Site Location: Creston, NC Date Completed: 1-Oct-22 3 of 6
Constiuent:Ethyl benzene
Source Medium:Affected Groundwater
Biodegredation:None
Concentration vs. Distance from Source Time (yr)20.0 FALSE 0 Off-site1 Off-site2
(for given time)0.1 ##Residential Residential
Distance (ft)0 48 96 144 192 240 288 336 384 432 480 ###175 260
t = 20 yr 1.4E-1 1.4E-1 1.2E-1 8.4E-2 5.5E-2 3.5E-2 2.2E-2 1.4E-2 8.5E-3 5.3E-3 3.4E-3 ###6.4E-2 2.9E-2
Steady-state 1.4E-1 1.4E-1 1.2E-1 8.5E-2 5.9E-2 4.2E-2 3.1E-2 2.4E-2 1.9E-2 1.5E-2 1.2E-2 #####6.7E-2 3.7E-2
POE Concentration Limit (mg/L)1.6E+0 1.6E+0
t = 20 yr
Concentration vs. Time Distance (ft)217.5 0.01
(for given distance from source)0 0 7.0E-2
Time (yr)0 3 6 9 12 15 18 21 24 27 30 30 Time to Reach
x = 217.5 ft 0.0E+0 2.3E-5 3.0E-3 1.3E-2 2.5E-2 3.4E-2 4.1E-2 4.4E-2 4.6E-2 4.8E-2 4.8E-2 #####Conc. Limit (yr)
Off-site1 (175 ft)0.0E+0 2.1E-4 1.0E-2 3.0E-2 4.7E-2 5.7E-2 6.2E-2 6.5E-2 6.6E-2 6.7E-2 6.7E-2 Off-site1 NA
Off-site2 (260 ft)0.0E+0 2.4E-6 8.9E-4 5.7E-3 1.3E-2 2.0E-2 2.6E-2 3.0E-2 3.3E-2 3.4E-2 3.5E-2 Off-site2 NA
x = 217.5 ftConc.(mg/L)Conc.(mg/L)0.0E+0
2.0E-2
4.0E-26.0E-28.0E-2
1.0E-1
1.2E-11.4E-11.6E-1
1.8E-1
2.0E-1
0 50 100 150 200 250 300 350 400 450Conc. (mg/L)Distance
Steady-state
t = 20 yr
Off-site1 Conc.Limit
Off-site2 Conc.Limit
0.0E+0
1.0E-2
2.0E-2
3.0E-2
4.0E-2
5.0E-2
6.0E-2
7.0E-2
0 5 10 15 20 25 30Conc. (mg/L)Time (yr)
x = 217.5 ft
Off-site1 (175 ft)
Off-site2 (260 ft)
Off-site1 Conc.Limit
Off-site2 Conc.Limit
Gasoline Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.51
RBCA SITE ASSESSMENT TIER 2 TRANSIENT DOMENICO ANALYSIS
Site Name: Stephens Exxon Completed By: C. Driscoll Job ID: 75207132
Site Location: Creston, NC Date Completed: 1-Oct-22 4 of 6
Constiuent:Xylenes (mixed isomers)
Source Medium:Affected Groundwater
Biodegredation:None
Concentration vs. Distance from Source Time (yr)20.0 FALSE 0 Off-site1 Off-site2
(for given time)0.1 ##Residential Residential
Distance (ft)0 48 96 144 192 240 288 336 384 432 480 ###175 260
t = 20 yr 2.7E-1 2.7E-1 2.3E-1 1.6E-1 1.0E-1 6.3E-2 3.8E-2 2.3E-2 1.4E-2 8.4E-3 5.1E-3 ###1.2E-1 5.1E-2
Steady-state 2.7E-1 2.7E-1 2.3E-1 1.6E-1 1.1E-1 8.0E-2 5.9E-2 4.5E-2 3.5E-2 2.8E-2 2.3E-2 #####1.3E-1 7.0E-2
POE Concentration Limit (mg/L)3.1E+0 3.1E+0
t = 20 yr
Concentration vs. Time Distance (ft)217.5 0.1
(for given distance from source)0 0 2.0E-1
Time (yr)0 3 6 9 12 15 18 21 24 27 30 30 Time to Reach
x = 217.5 ft 0.0E+0 1.9E-5 3.8E-3 2.0E-2 4.1E-2 6.0E-2 7.3E-2 8.1E-2 8.7E-2 9.0E-2 9.2E-2 #####Conc. Limit (yr)
Off-site1 (175 ft)0.0E+0 2.1E-4 1.4E-2 4.9E-2 8.1E-2 1.0E-1 1.2E-1 1.2E-1 1.3E-1 1.3E-1 1.3E-1 Off-site1 NA
Off-site2 (260 ft)0.0E+0 1.7E-6 1.0E-3 8.0E-3 2.1E-2 3.4E-2 4.5E-2 5.4E-2 5.9E-2 6.3E-2 6.6E-2 Off-site2 NA
x = 217.5 ftConc.(mg/L)Conc.(mg/L)0.0E+0
5.0E-2
1.0E-1
1.5E-1
2.0E-1
2.5E-1
3.0E-1
0 50 100 150 200 250 300 350 400 450Conc. (mg/L)Distance
Steady-state
t = 20 yr
Off-site1 Conc.Limit
Off-site2 Conc.Limit
0.0E+0
5.0E-2
1.0E-1
1.5E-1
2.0E-1
0 5 10 15 20 25 30Conc. (mg/L)Time (yr)
x = 217.5 ft
Off-site1 (175 ft)
Off-site2 (260 ft)
Off-site1 Conc.Limit
Off-site2 Conc.Limit
Gasoline Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.51
RBCA SITE ASSESSMENT TIER 2 TRANSIENT DOMENICO ANALYSIS
Site Name: Stephens Exxon Completed By: C. Driscoll Job ID: 75207132
Site Location: Creston, NC Date Completed: 1-Oct-22 6 of 6
Constiuent:Trimethylbenzene, 1,2,4-
Source Medium:Affected Groundwater
Biodegredation:None
Concentration vs. Distance from Source Time (yr)20.0 FALSE 0 Off-site1 Off-site2
(for given time)0.1 ##Residential Residential
Distance (ft)0 48 96 144 192 240 288 336 384 432 480 ###175 260
t = 20 yr 1.3E-1 1.3E-1 9.0E-2 3.7E-2 1.2E-2 4.0E-3 1.3E-3 4.1E-4 1.3E-4 4.5E-5 1.5E-5 ###1.8E-2 2.5E-3
Steady-state 1.3E-1 1.3E-1 1.1E-1 8.2E-2 5.7E-2 4.0E-2 3.0E-2 2.3E-2 1.8E-2 1.4E-2 1.2E-2 #####6.4E-2 3.5E-2
POE Concentration Limit (mg/L)7.8E-1 7.8E-1
t = 20 yr
Concentration vs. Time Distance (ft)217.5 0.01
(for given distance from source)0 0 5.0E-2
Time (yr)0 3 6 9 12 15 18 21 24 27 30 30 Time to Reach
x = 217.5 ft 0.0E+0 8.5E-13 6.4E-7 5.7E-5 5.3E-4 1.9E-3 4.5E-3 8.0E-3 1.2E-2 1.7E-2 2.1E-2 #####Conc. Limit (yr)
Off-site1 (175 ft)0.0E+0 2.3E-10 1.2E-5 4.5E-4 2.6E-3 7.1E-3 1.4E-2 2.1E-2 2.8E-2 3.5E-2 4.1E-2 Off-site1 NA
Off-site2 (260 ft)0.0E+0 3.3E-15 3.4E-8 7.4E-6 1.1E-4 5.3E-4 1.5E-3 3.1E-3 5.2E-3 7.6E-3 1.0E-2 Off-site2 NA
x = 217.5 ftConc.(mg/L)Conc.(mg/L)0.0E+0
2.0E-2
4.0E-26.0E-28.0E-2
1.0E-1
1.2E-11.4E-11.6E-1
1.8E-1
2.0E-1
0 50 100 150 200 250 300 350 400 450Conc. (mg/L)Distance
Steady-state
t = 20 yr
Off-site1 Conc.Limit
Off-site2 Conc.Limit
0.0E+0
1.0E-2
2.0E-2
3.0E-2
4.0E-2
5.0E-2
0 5 10 15 20 25 30Conc. (mg/L)Time (yr)
x = 217.5 ft
Off-site1 (175 ft)
Off-site2 (260 ft)
Off-site1 Conc.Limit
Off-site2 Conc.Limit
Gasoline Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.51
RBCA SITE ASSESSMENT
1 OF 7
TIER 2 EXPOSURE CONCENTRATION AND INTAKE CALCULATION
GROUNDWATER EXPOSURE PATHWAYS o (Checked if Pathway is Complete)
SOILS : LEACHING TO
GROUNDWATER INGESTION 1) Source Medium 2) NAF Value (L/kg)3) Exposure Medium
Receptor Groundwater: POE Conc. (mg/L) (1)/(2)
Soil Conc.
On-site
(0 ft)
Off-site 1
(175 ft)
Off-site 2
(260 ft)
On-site
(0 ft)
Off-site 1
(175 ft)
Off-site 2
(260 ft)
Constituents of Concern (mg/kg)None Residential Residential None Residential Residential
Benzene
Toluene
Ethyl benzene
Xylenes (mixed isomers)
Naphthalene
Trimethylbenzene, 1,2,4-
* = Chemical with user-specified data
NOTE: NAF = Natural attenuation factor POE = Point of exposure
Site Name: Stephens Exxon Date Completed: 1-Oct-22
Site Location: Creston, NC Job ID: 75207132
Completed By: C. Driscoll
Gasoline Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.51
RBCA SITE ASSESSMENT
2 OF 7
TIER 2 EXPOSURE CONCENTRATION AND INTAKE CALCULATION
GROUNDWATER EXPOSURE PATHWAYS
SOILS : LEACHING TO
GROUNDWATER INGESTION (cont'd)4) Exposure Multiplier 5) Average Daily Intake Rate
(IRxEFxED)/(BWxAT) (L/kg-day)(mg/kg/day) (3) x (4)
On-site
(0 ft)
Off-site 1
(175 ft)
Off-site 2
(260 ft)
On-site
(0 ft)
Off-site 1
(175 ft)
Off-site 2
(260 ft)
Constituents of Concern None Residential Residential None Residential Residential
Benzene
Toluene
Ethyl benzene
Xylenes (mixed isomers)
Naphthalene
Trimethylbenzene, 1,2,4-
* = Chemical with user-specified data
NOTE: AT = Averaging time (days)ED = Exposure duration (yr)IR = Ingestion rate (mg/day)
BW = Body weight (kg)EF = Exposure frequency (days/yr)
Site Name: Stephens Exxon Completed By: C. Driscoll Job ID: 75207132
Site Location: Creston, NC Date Completed: 1-Oct-22
Gasoline Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.51
RBCA SITE ASSESSMENT
3 OF 7
TIER 2 EXPOSURE CONCENTRATION AND INTAKE CALCULATION
GROUNDWATER EXPOSURE PATHWAYS n (Checked if Pathway is Complete)
GROUNDWATER: INGESTION
1) Source Medium 2) NAF Value (unitless)3) Exposure Medium
Receptor Groundwater: POE Conc. (mg/L) (1)/(2)
Groundwater
On-site
(0 ft)
Off-site 1
(175 ft)
Off-site 2
(260 ft)
On-site
(0 ft)
Off-site 1
(175 ft)
Off-site 2
(260 ft)
Constituents of Concern Conc. (mg/L)None Residential Residential None Residential Residential
Benzene 0.0E+0 2.1E+0 3.8E+0 0.0E+0 0.0E+0
Toluene 1.9E-2 2.1E+0 3.8E+0 9.0E-3 4.9E-3
Ethyl benzene 1.4E-1 2.1E+0 3.8E+0 6.7E-2 3.7E-2
Xylenes (mixed isomers)2.7E-1 2.1E+0 3.8E+0 1.3E-1 7.0E-2
Naphthalene 0.0E+0 2.1E+0 3.8E+0 0.0E+0 0.0E+0
Trimethylbenzene, 1,2,4-1.3E-1 2.1E+0 3.8E+0 6.4E-2 3.5E-2
NOTE: NAF = Natural attenuation factor POE = Point of exposure
Site Name: Stephens Exxon Date Completed: 1-Oct-22
Site Location: Creston, NC Job ID: 75207132
Completed By: C. Driscoll
Gasoline Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.51
RBCA SITE ASSESSMENT
4 OF 7
TIER 2 EXPOSURE CONCENTRATION AND INTAKE CALCULATION
GROUNDWATER EXPOSURE PATHWAYS
GROUNDWATER INGESTION (cont'd)
4) Exposure Multiplier 5) Average Daily Intake Rate
(IRxEFxED)/(BWxAT) (L/kg/day)(mg/kg/day) (3) x (4)
On-site
(0 ft)
Off-site 1
(175 ft)
Off-site 2
(260 ft)
On-site
(0 ft)
Off-site 1
(175 ft)
Off-site 2
(260 ft)
Constituents of Concern None Residential Residential None Residential Residential
Benzene 1.5E-2 1.5E-2 0.0E+0 0.0E+0
Toluene 6.4E-2 6.4E-2 5.8E-4 3.2E-4
Ethyl benzene 6.4E-2 6.4E-2 4.3E-3 2.4E-3
Xylenes (mixed isomers)6.4E-2 6.4E-2 8.2E-3 4.5E-3
Naphthalene 6.4E-2 6.4E-2 0.0E+0 0.0E+0
Trimethylbenzene, 1,2,4-6.4E-2 6.4E-2 4.1E-3 2.3E-3
* = Chemical with user-specified data
NOTE: AT = Averaging time (days)ED = Exposure duration (yr)IR = Ingestion rate (mg/day)
BW = Body weight (kg)EF = Exposure frequency (days/yr)
Site Name: Stephens Exxon Completed By: C. Driscoll Job ID: 75207132
Site Location: Creston, NC Date Completed: 1-Oct-22
Gasoline Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.51
RBCA SITE ASSESSMENT
5 OF 7
TIER 2 EXPOSURE CONCENTRATION AND INTAKE CALCULATION
GROUNDWATER EXPOSURE PATHWAYS
MAXIMUM PATHWAY INTAKE (mg/kg/day)
(Maximum intake of active pathways
soil leaching & groundwater routes.)
On-site
(0 ft)
Off-site 1
(175 ft)
Off-site 2
(260 ft)
Constituents of Concern None Residential Residential
Benzene
Toluene 5.8E-4 3.2E-4
Ethyl benzene 4.3E-3 2.4E-3
Xylenes (mixed isomers)8.2E-3 4.5E-3
Naphthalene
Trimethylbenzene, 1,2,4-4.1E-3 2.3E-3
* = Chemical with user-specified data
Site Name: Stephens Exxon Date Completed: 1-Oct-22
Site Location: Creston, NC Job ID: 75207132
Completed By: C. Driscoll
Gasoline Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.51
RBCA SITE ASSESSMENT
6 OF 7
TIER 2 PATHWAY RISK CALCULATION
GROUNDWATER EXPOSURE PATHWAYS n (Checked if Pathway is Complete)
CARCINOGENIC RISK
(1) Is (2) Maximum Carcinogenic (3) Oral (4) Individual COC
Carcinogenic Intake Rate (mg/kg/day)Slope Factor Risk (2) x (3)
On-site
(0 ft)
Off-site 1
(175 ft)
Off-site 2
(260 ft)
(mg/kg-day)^-1 On-site
(0 ft)
Off-site 1
(175 ft)
Off-site 2
(260 ft)
Constituents of Concern None Residential Residential None Residential Residential
Benzene TRUE 1.5E-2
Toluene FALSE -
Ethyl benzene FALSE -
Xylenes (mixed isomers)FALSE -
Naphthalene FALSE -
Trimethylbenzene, 1,2,4-FALSE -
Total Pathway Carcinogenic Risk =
Site Name: Stephens Exxon Date Completed: 1-Oct-22
Site Location: Creston, NC Job ID: 75207132
Completed By: C. Driscoll
Gasoline Plume - Model
RBCA Tool Kit for Chemical Releases, Version 2.51
RBCA SITE ASSESSMENT
7 OF 7
TIER 2 PATHWAY RISK CALCULATION
GROUNDWATER EXPOSURE PATHWAYS n (Checked if Pathway is Complete)
TOXIC EFFECTS
(5) Maximum Toxicant (6) Oral (7) Individual COCIntake Rate (mg/kg/day)Reference Hazard Quotient (5) / (6)
On-site
(0 ft)
Off-site 1
(175 ft)
Off-site 2
(260 ft)
Dose
(mg/kg/day)
On-site
(0 ft)
Off-site 1
(175 ft)
Off-site 2
(260 ft)
Constituents of Concern None Residential Residential None Residential Residential
Benzene 0.0E+0 0.0E+0 4.0E-3 0.0E+0 0.0E+0
Toluene 5.8E-4 3.2E-4 8.0E-2 7.2E-3 4.0E-3
Ethyl benzene 4.3E-3 2.4E-3 1.0E-1 4.3E-2 2.4E-2
Xylenes (mixed isomers)8.2E-3 4.5E-3 2.0E-1 4.1E-2 2.3E-2
Naphthalene 2.0E-2
Trimethylbenzene, 1,2,4-4.1E-3 2.3E-3 5.0E-2 8.2E-2 4.5E-2
Total Pathway Hazard Index =1.7E-1 9.5E-2
Site Name: Stephens Exxon Date Completed: 1-Oct-22
Site Location: Creston, NC Job ID: 75207132
Completed By: C. Driscoll
Gasoline Plume - Model