RA-2805_18206_CA_MRP_20191223

SUBSEQUENT MONITORING REPORT
Adam’s Place (Incident #18206)
1208 West Academy Street
Fuquay-Varina, Wake County, North Carolina
December 23, 2019
Terracon Project No. 70149662A

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

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

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 ................................................................................................................................ 6
D. ASSESSMENT INFORMATION ............................................................................ 7
D.1 Free Product Evaluation ......................................................................................................................... 7
D.2 Groundwater Sampling Activities ........................................................................................................... 7
D.3 Groundwater Analytical Results ............................................................................................................. 8
D.4 Petroleum Vapor Intrusion Assessment ................................................................................................ 8
D.1.1 Indoor Air Survey and Screening Results ........................................................................................... 10
D.1.2 Soil Vapor, Crawl Space Air, and Ambient Air Analytical Results ...................................................... 10
E. CONCLUSIONS AND RECOMMENDATIONS ................................................... 11
REFERENCES .............................................................................................................. 14
FIGURES
Figure 1: Site Location Map
Figure 2: Site Plan
Figure 3: Water Supply Well Location Map
Figure 4: Groundwater Elevation Map (October 2019)
Figure 5: Groundwater Analytical Results (October 2019)
Figure 6: Benzene Isoconcentration Map (October 2019)
Figure 7: MTBE Isoconcentration Map (October 2019)
Figure 8: Indoor Air Screening Results (October 2019)
Figure 9: Indoor Air and Sub-Slab Sample Location Map (October 2019)

TABLES
Table 1: Conceptual Site Model
Table 2: Water Supply Well Information
Table 3: Monitoring Well Construction Information and Historical Groundwater Elevations
Table 4: Summary of Groundwater Analytical Results
Table 5: Summary of Indoor Air and Sub-Slab Soil Gas Analytical Results

APPENDIX
Appendix A: Photographs and Field Notes
Appendix B: Laboratory Analytical Results and Chain of Custody Forms
Adam’s Place
Fuquay-Varina, North Carolina
Terracon Project No. 70149662A
Incident No. 18206
December 23, 2019

Responsive ■ Resourceful ■ Reliable 1

SUBSEQUENT MONITORING REPORT

A. SITE INFORMATION

Date of Report: December 23, 2019
UST Number: RA-2805
NCDEQ Incident No: 18206
Facility ID: 0-029430
Site Name: Adam’s Place
Site Location: 1208 West Academy Street, Fuquay-Varina, North Carolina 27526
Latitude/Longitude: N 35.576294 W 78.832251
UST Owner/Operator: N/A

Current Property Owner: Ms. Myrtle Pearce
15 Victoria Hills Drive
Fuquay-Varina, North Carolina 27526
[phone]
Current Property
Occupant: Buckhorn General Store

Consultant: Terracon Consultants, Inc. (Contact: Justin L. Fabriziani)
2401 Brentwood Road, Suite 107
Raleigh, North Carolina 27604
919-873-2211

Laboratory(s): Shealy Environmental Services, Inc. (NCDEQ No. 329)
106 Vantage Point Drive
West Columbia, South Carolina 29712
803-227-2704

Pace Analytical National
12065 Lebanon Road
Mount Juliet, Tennessee 37122
615-758-5858

Release Information: Release Discovery Date: November 1997
Estimated Quantity: Unknown
Cause of Release: Underground/Aboveground Storage Tank Systems
Currently Active Tanks: None
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Fuquay-Varina, North Carolina
Terracon Project No. 70149662A
Incident No. 18206
December 23, 2019

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◼ Ten petroleum constituents were detected in monitoring wells MW-1, MW-4, MW-5, MW-6,
MW-7, MW-2A, and/or MW-5A at concentrations exceeding their 2L standards.
◼ Gross contamination level (GCL) exceedances were not identified in the monitoring wells.
However, GCL exceedances for benzene were detected at the site in MW-1 from April 2013 to
December 2017.
◼ Measurable thicknesses of free product were not observed in the monitoring wells. Free
product thicknesses have not historically been encountered at the site. However, it should be
noted that free product was observed in soil borings completed in February 2016. Free product
is likely below residual saturation concentrations and not mobile.

◼ The contaminant plume has not been delineated to the southeast of the source area and
extends off-site in that direction. Terracon previously discussed with property owners to the
south of the site potentially installing monitoring wells to assist in delineation of the plume;
however, permission to install wells on those properties was not granted at that time. The
contaminant plume is not delineated vertically; however, the need for vertical delineation can be
reevaluated in the future following potential water supply well abandonment and/or remediation
activities.
◼ Nine water supply wells were identified as active, potable water sources within 1,000 feet of the
source area. Four of these wells are situated within 500 feet of the source area. WSW-3
(topographically upgradient) and WSW-12 (topographically cross- to downgradient) are situated
approximately 180 feet northeast and 365 feet southeast of the source area, respectively.
WSW-3 and WSW-12 have been sampled since at least October 2011 and have not contained
detectable concentrations of petroleum constituents.
◼ Municipal water is reportedly available to the site and properties to the south of the site;
however, it is not available to the north of the site. Two property owners (water supply well
WSW-3 and WSW-12 owners) have agreed to connect to municipal water, but in order to do so
these properties need to be annexed into the Town of Fuquay-Varina. NCDEQ has requested
that the Town of Fuquay-Varina waive the annexation fee for these properties.
◼ Benzene, ethylbenzene, n-propylbenzene, toluene, 1,2,4-trimethylbenzene,
1,3,5-trimethylbenzene, and/or xylenes were detected below their Non-Residential Sub-Slab Soil
Gas Screening Levels (SGSLs) in the sub-slab soil vapor and crawl space air samples. Seven
petroleum compounds were detected within each of the indoor air samples. Of these
compounds, benzene and ethylbenzene were detected above their Non-Residential NCDEQ
Indoor Air Screening Levels (IASLs) in IA-01, IA-02, and IA-03. Toluene was detected above
laboratory reporting limits within the outdoor air sample.

Adam’s Place
Fuquay-Varina, North Carolina
Terracon Project No. 70149662A
Incident No. 18206
December 23, 2019

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◼ Benzene, ethylbenzene, n-propylbenzene, toluene, 1,2,4-trimethylbenzene,
1,3,5-trimethylbenzene, and/or xylenes were detected in paired samples (IA-01 and SV-01,
IA-02 and SV-02, and CA-01 and IA-03). The concentrations of these compounds detected
within indoor air ranged from 0.8 to 13.59 times higher than the concentrations detected within
the sub-slab and crawl space samples. These data do not indicate a complete vapor pathway;
however, the results of Terracon’s June 2016 vapor evaluation suggested a complete vapor
intrusion pathway.

C. SITE HISTORY AND CHARACTERIZATION

The purpose of this report is to evaluate the current groundwater quality at the site and in nearby
water supply wells as well as to evaluate petroleum vapor intrusion risk at the site. Terracon
completed this report to summarize the findings of assessment activities performed in October 2019
at the Adam’s Place site located at 1208 West Academy Street in Fuquay-Varina, Wake County,
North Carolina (Figure 1). This Subsequent Monitoring report was prepared for the site in response
to a request by Mr. Mark Petermann, Incident Manager with the NCDEQ Division of Waste
Management, State Lead Program.

The Subsequent Monitoring Report was prepared in general accordance with the 15A NCAC
2L.0115 regulations and the NCDEQ Underground Storage Tank (UST) Section Guidelines for
Assessment and Corrective Action for UST Releases, dated July 15, 2008, revised December 2013,
under the supervision of Mr. William O. Frazier, a North Carolina registered licensed geologist
(North Carolina License No. 2576).

C.1 Site Setting
The Adam’s Place site is located at 1208 West Academy Street, is comprised of 0.75 acres, and
contains a single-story commercial building operated as Buckhorn General Store. The remainder of
the site consists of paved, gravel and grassy areas.

The surrounding properties primarily consist of undeveloped woodlands with residences to the north,
northeast, and south. An automotive sales facility is located to the east and an automotive repair
and towing/recovery facility is located to the southeast. The site and surrounding properties are
depicted on Figure 1 and Figure 2.

C.2 Release Summary
The first of three petroleum releases at the site was discovered in October 1997, when laboratory
analysis of a soil sample collected during UST closure activities revealed petroleum contaminants in
the soil. Additional releases were identified in 2003 following overfill of an above ground storage
tank (AST) and in 2014 during closure of a 15,000-gallon gasoline and a 5,000-gallon diesel UST,
Adam’s Place
Fuquay-Varina, North Carolina
Terracon Project No. 70149662A
Incident No. 18206
December 23, 2019

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which were installed in 2004. The following table summarizes the reported operation and
abandonment of USTs and ASTs:

ID Type Contents Volume (gallons) Installed Abandoned Method
1 UST Diesel 3,000 1989 1997 In-place
2 UST Diesel 1,100 Unknown 1997
2003
In-place/
Removal
3 AST Gasoline 10,000 Unknown 2003 Removal
4 UST Gasoline 15,000 2004 2014 Removal
5 UST Diesel 5,000 2004 2014 Removal
6 UST Gasoline 590 Unknown 2014 Removal
7 UST Unknown ~1,000 Unknown Unknown In-place
8 UST Fuel 280 Unknown Unknown In-place

C.3 Previous Investigations
In October 1997, an approximate 3,000-gallon diesel UST was closed in-place at the site
(SPATCO, 1997). This UST is situated beneath the eastern end of the on-site building. Residual
material was pumped from the UST and the UST was then filled with an inert, expandable foam. Six
soil samples collected from around the UST and from beneath a dispenser exhibited concentrations
of gasoline range TPH above NCDEQ’s Action Levels (SPATCO, 1997).

In January/February 2003 the second release at the site occurred when a gasoline AST was
overfilled and ruptured. Soil excavation activities were undertaken at the site in response to the
overfill incident. Approximately 645 tons of petroleum contaminated soil was excavated. During the
excavation activities, an abandoned 1,100-gallon diesel UST was encountered and removed.
Confirmation soil samples indicated total petroleum hydrocarbons (TPH) concentrations were below
NCDEQ’s Action Levels (Structures, 2003)

The third release was identified during UST closure and initial abatement activities in February 2014
during the removal of a 15,000-gallon gasoline and a 5,000-gallon diesel UST (HNES, 2014a).
Obvious indications of petroleum impacts to soil were identified during excavation including free
phase product. Consequently, approximately 260 tons of contaminated soil was excavated from the
site. During excavation activities, an additional approximate 590-gallon UST was encountered and
removed. Numerous soil samples were collected from the floor and sidewalls of the excavation area
following soil excavation. Laboratory analysis indicated that several petroleum constituents remained
in soil near the former dispensers at concentrations above NCDEQ’s soil-to-groundwater MSCCs.

In March 2015, two groundwater samples were collected from MW-1 and MW-2A for C3-C10 gasoline
range quantitation via EPA Method 5030 (Purge and Trap) by ZymaX Forensics in Escondido,
California, a subsidiary laboratory for Pace Analytical Services. The intent of this analysis was to
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Fuquay-Varina, North Carolina
Terracon Project No. 70149662A
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determine if the petroleum constituents detected in the groundwater could be characterized as
having come from two separate releases. The potential exists for this scenario at the site due to the
operation of multiple historical UST systems. The analytical data indicated that petroleum detections
in these wells likely originate from the same or a very similar gasoline. Therefore, the petroleum
contaminants in MW-1 and MW-2A likely resulted from the same release.

Soil sampling was completed near the eastern corner of the building in 2016. Staining and/or free
phase product were observed in each of the borings from approximately two to six feet below land
surface (ft bls). Analytical results indicated that residual impacts in soil in the vicinity of MW-1, MW-4,
and MW-5 were above soil-to-groundwater Maximum Contaminant Concentrations (MSCCs) and two
constituents (benzene and benzo(a)pyrene) were detected in saturated soil between three and eight
ft bls above residential MSCCs (Terracon 2016a).

In June 2016, Ms. Myrtle Pearce, the current property owner, stated that she was aware of an
additional UST located on the site, in the southeastern vicinity of the store (UST ID: 7). She was not
aware of the contents or installation and abandonment dates, but stated she believed it to be an
approximately 1,000-gallon UST, abandoned in place, and filled with sand.

Terracon completed a vapor intrusion assessment in June 2016. Based on assessment data, the
vapor intrusion pathway was considered to be complete. Furthermore, benzene, ethylbenzene, and
1,2,4-trimethylbenzene were detected above their NCDEQ Non-Residential IASLs (Terracon, 2016b).

In October 2018, Ms. Myrtle Pearce indicated she was aware of an additional approximate
280-gallon fuel oil UST (UST ID: 8) located in the southeast corner of the site, near MW-5. She did
not know if the tank had been removed from the ground or filled with concrete, but indicated that it
had been emptied.

Investigation results were used to generate a conceptual site model of current conditions, which is
included as Table 1.

C.4 Water Supply Wells
Nine water supply wells were identified as active potable water sources within 1,000 feet of the
source area. Four of these wells are situated within 500 feet of the source area (HNES, 2014b).
WSW-3 (topographically upgradient) and WSW-12 (topographically cross- to downgradient) are
situated approximately 180 feet northeast and 365 feet southeast of the source area, respectively.
WSW-3 and WSW-12 have been sampled since at least October 2011 and have not contained
detectable concentrations of petroleum constituents. Two on-site water supply wells (WSW-1 and
WSW-2) are inactive. The site, as well as the adjacent auto sales property, is served by water supply
well WSW-3. Municipal water is reportedly available to the site and properties to the south of the site;
however, it is not available to the north of the site.

Adam’s Place
Fuquay-Varina, North Carolina
Terracon Project No. 70149662A
Incident No. 18206
December 23, 2019

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On behalf of NCDEQ, Terracon previously discussed connection of the WSW-3 and WSW-12
properties to municipal water with the respective property owners. The property owners (Ms. Myrtle
Pierce and Hartshorn Properties) have verbally indicated their willingness to have their properties
connected and wells abandoned; however, in ascertaining the potential cost for making these
connections, it was determined that the properties in question would need to be annexed by the
Town of Fuquay-Varina. Both property owners would have to agree to be annexed and then be
subject to some initial costs and then property tax. Specifically, the process to annex the properties
would involve an online application, survey of the property boundaries, a pre-submittal meeting, and
a $200 application fee. Formal agreements from the property owners are outstanding.

Results of the water supply well inventory are presented in Table 2 and well locations are depicted
on Figure 3.

D. ASSESSMENT INFORMATION

Terracon mobilized to the site on October 29, 2019 to conduct groundwater sampling of monitoring
wells (MW-1 through MW-7 and MW-1A through MW-5A) and two water supply wells (WSW-3 and
WSW-12), as well as conduct a vapor intrusion assessment.

D.1 Free Product Evaluation

Free product was not encountered in the monitoring wells during this assessment. Free product
thicknesses have not historically been identified at the site. However, it should be noted that free
product was observed in soil borings completed in February 2016 (Terracon, 2016a). Free product is
likely below residual saturation concentrations and not mobile.

D.2 Groundwater Sampling Activities
Terracon gauged the groundwater elevations in twelve monitoring wells. The approximate locations
of the wells are shown on the Site Plan (Figure 2). Current and historical groundwater elevation
measurements are provided in Table 2. Groundwater flow was estimated, based on groundwater
elevation data, to be toward the south-southeast. Groundwater elevations and groundwater elevation
contours are depicted on Figure 4. Photographs and copies of field notes are provided in
Appendix A.

The wells were purged with a peristaltic pump using low flow sampling techniques (i.e., <200
milliliters per minute) prior to sampling. Field parameters consisting of pH, temperature, oxidation-
reduction potential (ORP), dissolved oxygen, and conductivity were measured at each of the well
locations. After stabilization of pH and conductivity, a groundwater sample was collected directly into
laboratory supplied containers at low flow sampling rates.
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Fuquay-Varina, North Carolina
Terracon Project No. 70149662A
Incident No. 18206
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Groundwater samples were collected from water supply wells WSW-3 and WSW-12.
The groundwater samples were collected by allowing water to flow from a spigot for approximately
15 minutes prior to collecting the sample to retrieve a fresh sample from the well. Flow from the
spigot was reduced when the sample was collected directly into laboratory supplied containers.

The groundwater samples 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
Shealy Environmental Services, Inc. (Shealy), in West Columbia, South Carolina for analysis of
VOCs by EPA Method 6200B including methyl tert-butyl ether (MTBE), ethylene dibromide (EDB) and
di-isopropyl ether (IPE).

D.3 Groundwater Analytical Results
Based on the laboratory analytical reports, ten petroleum constituents (benzene,
1,2-dichloroethane, ethylbenzene, MTBE, naphthalene, n-propylbenzene, toluene,
1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, and xylenes) were identified at concentrations above
their 2L standards in monitoring wells MW-1, MW-4, MW-5, MW-6, MW-7, MW-2A, and MW-5A.
GCL exceedances were not identified in the monitoring wells. Petroleum constituents were not
present at concentrations above 2L standards in the remaining monitoring wells.

Petroleum constituents were not detected above the laboratory’s detection limits in water supply
wells WSW-3 or WSW-12.

A summary of groundwater analytical results is included on Table 3 and Figure 5. Copies of the
laboratory analytical reports are provided in Appendix B. Isoconcentration maps for benzene and
MTBE are provided as Figures 6 and 7, respectively. These maps depict the approximate lateral
extent of benzene and MTBE in the groundwater; however, the contaminant plume has not been
delineated to the southeast.

D.4 Petroleum Vapor Intrusion Assessment
An indoor air survey was conducted to identify potential background sources of VOCs from materials
and substances present in the building. The survey also included a description of the structure and
weather conditions. Results were documented on a survey form and are included in Appendix A.
Indoor air screening was also conducted using a PID that measures in the parts per billion (ppb)
range. The screening was conducted throughout the interior of the on-site structure. Screening
activities focused on cracks in the floor, floor and wall penetrations, and conduit locations to identify
possible locations of preferential vapor migration into the building. The results of the indoor air
screening are shown on Figure 8.

Three indoor air samples (IA-01 through IA-03) and one outdoor air (background) sample (OA-03)
were collected on October 29, 2019. The outdoor air sample was collected to provide a direct
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Fuquay-Varina, North Carolina
Terracon Project No. 70149662A
Incident No. 18206
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comparison between outdoor (i.e. background) and indoor detected compounds. The samples were
collected using individually certified 6-liter Summa® canisters placed within the approximate human
breathing zone (three to five feet above floor level). The canisters were obtained from a certified
laboratory, certified clean to the reporting limit, fitted with a vacuum gauge, and under a vacuum of
25 to 30 inches of Hg. The prepared canisters were fitted with calibrated flow-controllers to collect
samples at a constant flow-rate. Indoor air samples were collected over a duration of approximately
6 hours.

The canister vacuum was recorded prior to and periodically during the filling period. At the conclusion
of the sampling event, the final canister vacuum was recorded. The canisters were packaged and
delivered along with chain of custody documentation to Pace Analytical National in Mount Juliet,
Tennessee for analysis of VOCs via EPA Method TO-15 for petroleum compounds detected in
groundwater samples during the preceding event in December 2017. The list of analyzed compounds
is as follows:

◼ benzene
◼ sec-butylbenzene
◼ ethylbenzene
◼ isopropylbenzene
◼ methyl tert butyl ether (MTBE)
◼ naphthalene
◼ n-propylbenzene
◼ toluene
◼ 1,2,4-trimethylbenzene
◼ 1,3,5-trimethylbenzene
◼ total xylenes.

The locations of the ambient air samples are included on Figure 9.

Two sub-slab soil vapor screening points (SV-01 and SV-02) were installed on October 29, 2019.
Points were paired/located adjacent to indoor ambient air locations to allow for comparison of
sub-slab and indoor air sample data. The soil vapor points were constructed in general accordance
with the practices outlined in the NCDEQ Division of Waste Management Vapor Intrusion Guidance
(November 2015) and the Interstate Technology Regulatory Council Vapor Intrusion Pathway: A
Practical Guideline (January 2007).

The temporary sub-slab vapor points were constructed in boreholes advanced using a hammer drill
to penetrate the floor slab. The floor slab was approximately four inches thick. The points were
constructed using an assembled Vapor Pin™ installed within a 5/8-inch diameter hole. The hole was
lined with a pre-cut silicone sleeve that the Vapor Pin™ was hammered into the hole to create a
competent seal with the concrete floor slab. A 0.25-inch outside diameter Teflon® lined tube
connected to a Vapor Pin™ assembly to a laboratory-supplied Summa® canister.

Sampling of sub-slab soil vapor points was conducted after allowing the points to equilibrate for
approximately 2 hours. A helium tracer gas leak test was conducted as a QA/QC measure to verify
the integrity of the Vapor Pin™ seal prior to sampling. Approximately three volumes were purged
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Fuquay-Varina, North Carolina
Terracon Project No. 70149662A
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through Teflon® lined tubing while encased in a helium filled shroud. Purge samples were screened
for helium to assess for leaks in the well seal. The results of the tracer testing on the soil vapor
sampling points indicated helium concentrations in the vapor point were less than ten percent of the
helium concentration in the shroud, indicating a sufficiently sealed vapor point annulus at each point.
After completion of each helium tracer test, a laboratory supplied, batch certified 1.0-liter Summa®
canister was connected to the tubing at each soil vapor screening point using a Swagelok® fitting.
Each canister was filled using a dedicated flow controller and set to a sample rate of less than or
equal to 200 mL/min. An in-line vacuum gauge was installed to the sample controller to verify initial
vacuum levels within the canister and as an indicator that final equalization reached (i.e. sampling is
complete).

A crawl space air sample (CA-01) was collected under the store in lieu of a third sub-slab sample. Its
location was paired with indoor air sample IA-03. The set-up for the crawl space sample mimicked
that of the ambient air samples, utilizing a 6.0-liter Summa® canister with the 6-hour flow controller.

Soil vapor/crawl space samples were packaged and delivered along with chain of custody
documentation to Pace Analytical National in Mount Juliet, Tennessee for analysis of VOCs per EPA
Method TO-15 for petroleum compounds detected in groundwater samples during the preceding
April 2019 sampling event (compounds listed in Section D.1.2)

Following sampling, the Vapor Pins™ were removed and the boreholes were filled with grout to the
floor surface. The locations of the sub-slab and crawl space samples are included on Figure 9.

D.1.1 Indoor Air Survey and Screening Results
PID readings for the building screening ranged from 124-139 ppb in the sales portion of the store (in
the vicinity of indoor air samples IA-03 and IA-02). PID readings ranged from 109-229 ppb in the rear
storage portion of the store during screening (in the vicinity of indoor air sample IA-01). The highest
reading observed (229 ppb) was encountered in the western, rear storage portion of the store.
Appendix A and Figure 4 display the results of the indoor air screening. Based on the screening
values, potential background sources of contaminants may have contributed to the indoor air results
discussed in Section D.2.2.

D.1.2 Soil Vapor, Crawl Space Air, and Ambient Air Analytical Results

The analytical results for soil vapor, crawl space air, indoor air, and outdoor air are summarized on
Table 5. The laboratory analytical reports are provided in Appendix B. Outdoor air sample results
were not compared to NCDEQ standards. These results provide background concentrations of target
compounds. Sub-slab sampling soil vapor analytical results were compared to NCDEQ’s
Non-Residential Vapor Intrusion Screening Level - Sub-slab Soil Gas Screening Levels (SGSLs).
Crawl space air and ambient air analytical results were compared with NCDEQ’s
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Fuquay-Varina, North Carolina
Terracon Project No. 70149662A
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Non-Residential IASLs. The results of each paired sub-slab (or crawl space) sample was compared
with the adjacent indoor air sample.

At paired location SV-01 and IA-01, six of the same compounds (ethylbenzene, n-propylbenzene,
toluene, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, and total xylenes) were detected in each
sample. Two compounds (benzene and ethylbenzene) were detected in the IA-01 at concentrations
exceeding their IASL.

At paired location SV-02 and IA-02, six of the same compounds (benzene, ethylbenzene, toluene,
1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, total xylenes) were detected in each sample. One
compound (benzene) was detected in IA-02 at a concentration exceeding its IASL.

At paired location CA-01 and IA-03, one of the same compounds (toluene) was detected in each
sample. One compound (benzene) was detected in IA-03 at a concentration exceeding its IASL.

The following table summarizes the same compounds found in each paired location and their
attenuation factors:

Compound SV-01/IA-01
Attenuation factor
SV-02/IA-02
Attenuation factor
CA-01/IA-03
Attenuation factor
Benzene -- 5.37 --
Ethylbenzene 3.23 1.94 --
n-Propylbenzene 1.29 -- --
Toluene 9.04 4.61 13.59
1,2,4-trimethylbenzene 1.06 0.80 --
1,3,5-trimethylbenzene 1.22 0.96 --
Xylenes (total) 2.79 1.70 --

In outdoor air (background) sample OA-02, one compound (toluene) was detected above laboratory
reporting limits.

As the detected indoor air concentrations are higher than the detected paired sub-slab/crawl space
concentrations, the vapor intrusion pathway did not appear to be complete at the time of the October
2019 sampling.

E. CONCLUSIONS AND RECOMMENDATIONS

Based on information obtained during the completion of groundwater monitoring activities, Terracon
provides the following conclusions and findings.

Adam’s Place
Fuquay-Varina, North Carolina
Terracon Project No. 70149662A
Incident No. 18206
December 23, 2019

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◼ Ten petroleum constituents were detected in monitoring wells MW-1, MW-4, MW-5, MW-6,
MW-7, MW-2A, and/or MW-5A at concentrations exceeding their 2L standards.
◼ Gross contamination level (GCL) exceedances were not identified in the monitoring wells.
However, GCL exceedances for benzene were detected at the site in MW-1 from April 2013 to
December 2017.
◼ Measurable thicknesses of free product were not observed in the monitoring wells. Free
product thicknesses have not historically been encountered at the site. However, it should be
noted that free product was observed in soil borings completed in February 2016. Free product
is likely below residual saturation concentrations and not mobile.

◼ The contaminant plume has not been delineated to the southeast of the source area and
extends off-site in that direction. Terracon previously discussed with property owners to the
south of the site potentially installing monitoring wells to assist in delineation of the plume;
however, permission to install wells on those properties was not granted at that time. The
contaminant plume is not delineated vertically; however, the need for vertical delineation can be
reevaluated in the future following potential water supply well abandonment and/or remediation
activities.
◼ Nine water supply wells were identified as active, potable water sources within 1,000 feet of the
source area. Four of these wells are situated within 500 feet of the source area. WSW-3
(topographically upgradient) and WSW-12 (topographically cross- to downgradient) are situated
approximately 180 feet northeast and 365 feet southeast of the source area, respectively.
WSW-3 and WSW-12 have been sampled since at least October 2011 and have not contained
detectable concentrations of petroleum constituents.
◼ Municipal water is reportedly available to the site and properties to the south of the site;
however, it is not available to the north of the site. Two property owners (water supply well
WSW-3 and WSW-12 owners) have agreed to connect to municipal water, but in order to do so
these properties need to be annexed into the Town of Fuquay-Varina. NCDEQ has requested
that the Town of Fuquay-Varina waive the annexation fee for these properties.
◼ Benzene, ethylbenzene, n-propylbenzene, toluene, 1,2,4-trimethylbenzene,
1,3,5-trimethylbenzene, and/or xylenes were detected below their Non-Residential Sub-Slab Soil
Gas Screening Levels (SGSLs) in the sub-slab soil vapor and crawl space air samples. Seven
petroleum compounds were detected within each of the indoor air samples. Of these
compounds, benzene and ethylbenzene were detected above their Non-Residential NCDEQ
Indoor Air Screening Levels (IASLs) in IA-01, IA-02, and IA-03. Toluene was detected above
laboratory reporting limits within the outdoor air sample.
◼ Benzene, ethylbenzene, n-propylbenzene, toluene, 1,2,4-trimethylbenzene,
1,3,5-trimethylbenzene, and/or xylenes were detected in paired samples (IA-01 and SV-01,
IA-02 and SV-02, and CA-01 and IA-03). The concentrations of these compounds detected
Adam’s Place
Fuquay-Varina, North Carolina
Terracon Project No. 70149662A
Incident No. 18206
December 23, 2019

Responsive ■ Resourceful ■ Reliable 13

within indoor air ranged from 0.8 to 13.59 times higher than the concentrations detected within
the sub-slab and crawl space samples. These data do not indicate a complete vapor pathway;
however, the results of Terracon’s June 2016 vapor evaluation suggested a complete vapor
intrusion pathway.
◼ At paired location SV-01 and IA-01, ethylbenzene, n-propylbenzene, toluene,
1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, and xylenes were detected in each sample.
The attenuation factors for this pair ranged from 1.06 to 9.04 .
◼ At paired location SV-02 and IA-02, benzene, ethylbenzene, toluene, 1,2,4-trimethylbenzene,
1,3,5-trimethylbenzene, and xylenes were detected in each sample. The attenuation factors for
this pair ranged from 0.80 to 5.37.
◼ At paired location CA-01 and IA-03, toluene was detected in each sample. The attenuation
factor for toluene in this pair was 13.59.
◼ The soil vapor/indoor air data do not indicate a complete vapor pathway; however, the results of
Terracon’s June 2016 vapor evaluation (Table 6) suggested a complete vapor intrusion
pathway.
Based on the data presented in this Subsequent Monitoring report, Terracon recommends the
following activities be completed at the site.

◼ Groundwater monitoring wells (MW-1 through MW-5 and MW-1A through MW-5A) and water
supply wells (WSW-3 and WSW-12) should be sampled annually to evaluate the status of the
groundwater contaminant plume.
◼ Terracon is currently completing a corrective action feasibility study to evaluate the feasibility of
a limited soil excavation around MW-1 and the closed in-place 3,000-gallon diesel UST and
placement of a remedial compound within the excavation during backfill placement. Where
possible based on existing utilities and monitoring wells, an approximately 10-foot by 10-foot
area could be excavated to approximately 6 to 8 ft bls. The intent of the excavation of these
soils would be to remove the identified stained soils and free phase product. The overall intent
would be lower groundwater concentrations in the source area and subsequently downgradient
of the source area. The corrective action feasibility study will also evaluate alternative
remediation approaches.
◼ Additional attempts should be made to obtain property owner permission to install three
additional monitoring wells in the down-gradient (southern) direction in an attempt to delineate
the down-gradient edge of the contaminant plume.
◼ Attempt to obtain an agreement from owners of WSW-3 and WSW-12 to annex their properties
into the Town of Fuquay-Varina to allow for connection to the municipal water system. Should
the property owners agree to annexation, the Trust Fund may agree to pay costs associated
with the property survey and water line connection.
Adam’s Place
Fuquay-Varina, North Carolina
Terracon Project No. 70149662A
Incident No. 18206
December 23, 2019

Responsive ■ Resourceful ■ Reliable 14

◼ While the initial June 2016 vapor assessment determined a competed pathway, the April and
October 2019 data do not suggest a completed vapor intrusion pathway. Additional vapor
investigation should be conducted in January and May 2020 to further evaluate the vapor
pathway.

REFERENCES

◼ SPATCO, 1997. Underground Storage Tank Closure Report, Adam’s Place, October 1997
◼ Structures, 2003. Underground Storage Tank Closure Report, Adam’s Place, February 28, 2003
◼ Spill, 2003. Final Status Report, MTM Transport, March 5, 2003
◼ S&ME, 2010, Phase I Limited Site Assessment, Adam’s Place, July 14, 2010
◼ S&ME, 2011, Groundwater Monitoring Report, Adam’s Place, November 8, 2011
◼ Crawford, 2013. Groundwater Monitoring Report, Adam’s Place, May 29, 2013
◼ HNES, 2014a. 20 Day Report, Adams Place. March 26, 2014.
◼ HNES, 2014b. Initial Abatement Action Report, Adam’s Place, September 9, 2014
◼ HNES, 2014c. Phase II Limited Site Assessment, Adam’s Place, September 16, 2014
◼ Terracon, 2014. Federal/State-Lead Monitoring Report, Adam’s Place, October 24, 2014
◼ Terracon, 2015. Federal/State-Lead Monitoring Report, Adam’s Place, May 13, 2015
◼ Terracon, 2016a. Subsequent Monitoring Report, Adam’s Place, May 19, 2016
◼ Terracon, 2016b. Vapor Assessment, Adam’s Place, October 11, 2016
◼ Terracon, 2017. Subsequent Monitoring Report, Adam’s Place, May 22, 2017
◼ Terracon, 2018. Subsequent Monitoring Report, Adam’s Place, June 29, 2018

FIGURES
SITE
Copyright:© 2013 National Geographic Society, i-cubed
N:\ENV_EH&S\Env\GIS\Projects\2014\70149662 - Adam's Place State Lead\T_project\mxd\2019-10 Figs (TA-03)\70149662A_Fig1_SiteLoc_Oct2019.mxdSite Location Map FigureProject No.
Reviewed By:
Date:
Drawn By:
70149662A
DWH
JLF
November 2019 2401 Brentwood Rd.Raleigh, NC 27604
PH. [phone] terracon.com
³
ADAM'S PLACEINCIDENT #182061208 W. ACADEMY STREETFUQUAY-VARINA, NC
1^_
SITE COORDINATES: 78.832386 W 35.576289 N
0 2,500 5,0001,250 Feet
0 0.5 10.25
Miles
1:24,000
Data Source: USGS Fuquay-Varina Quadrangle, 1993, 7.5-Minute SeriesContour Interval: 10 feet
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
ED
D
D
")
")
")
MW-7
MW-6
MW-5
MW-4
MW-3
MW-2
MW-1
MW-5A
MW-4A
MW-3A
MW-2A
MW-1A
NCCGIA
N:\ENV_EH&S\Env\GIS\Projects\2014\70149662 - Adam's Place State Lead\T_project\mxd\2019-10 Figs (TA-03)\70149662A_Fig2 - Site Plan_Oct2019.mxdFigureProject No.
Reviewed By:
Date:
Drawn By:DWH
2401 Brentwood Rd.Raleigh, NC 27604
PH. [phone] terracon.com
2 N:\ENV_EH&S\Env\GIS\Projects\2014\70149662 - Adam's Place State Lead\T_project\mxd\2019-10 Figs (TA-03)\70149662A_Fig2 - Site Plan_Oct2019.mxdNotes:- Refer to the table inset for UST/AST details- The former AST farm consisted of four ASTs - Contents of three other former ASTs are unknown- UST ID 7 & 8 refer to UST reported by Ms. Mrytle PearceData Sources:- Well & Feature Locations - Henry Nemargut Eng. Services- Site Boundary - Wake County GIS- Imagery - ESRI WMS
Site Plan³
JLF
November 2019
ADAM'S PLACEINCIDENT #182061208 W. ACADEMY STREETFUQUAY-VARINA, NC
@A Monitoring Well
ED Water Supply Well (Active)
ED Water Supply Well (Inactive)Site Boundary
Former Product Line
UST
")Former Dispenser
^_
70149662A
Shed
BuckhornGeneralStore
WSW-1
WSW-2
Canopy W. Academy St. (NC Hwy 42)WSW-3
Canopy
0 20 4010Feet 1762345
8ID Type Contents Volume (gallons)Installed Abandoned Method
1 UST Diesel 3,000 1989 1997 In-place1997In-place/
2003 Removal
3 AST Gasoline 10,000 Unknown 2003 Removal
4 UST Gasoline 15,000 2004 2014 Removal
5 UST Diesel 5,000 2004 2014 Removal
6 UST Gasoline 590 Unknown 2014 Removal
7 UST Unknown ~1,000 Unknown Unknown In-place
8 UST Fuel 280 Unknown Unknown In-place
2 UST Diesel 1,100 Unknown
ED
ED ED
EDED ED
ED ED
ED
ED
ED
EDED
ED
EDED
WSW-9
WSW-8WSW-7WSW-6
WSW-5
WSW-4
WSW-3WSW-2WSW-1
WSW-16
WSW-15 WSW-14
WSW-13
WSW-12
WSW-11
WSW-10
500 ft
1,000 ft
1,500 ft
W . Academy St.Fleming Rd. N:\ENV_EH&S\Env\GIS\Projects\2014\70149662 - Adam's Place State Lead\T_project\mxd\2019-10 Figs (TA-03)\70149662A_Fig3_WSW Map_Oct2019.mxdFigureProject No.
Reviewed By:
Date:
Drawn By:DWH
2401 Brentwood Rd.Raleigh, NC 27604
PH. [phone] terracon.com
3 N:\ENV_EH&S\Env\GIS\Projects\2014\70149662 - Adam's Place State Lead\T_project\mxd\2019-10 Figs (TA-03)\70149662A_Fig3_WSW Map_Oct2019.mxd0 400 800200Feet
Data Sources:- Well Locations - Crawford Env. Services- Site/Parcel Boundaries - Wake County GIS
Water Supply Well Location Map³
JLF
November 2019
ADAM'S PLACEINCIDENT #182061208 W. ACADEMY STREETFUQUAY-VARINA, NC
ED Water Supply Well (Potable)
ED Water Supply Well (Inactive)
Railroad
Stream/River
Lake/Pond
Site Boundary
Tax Parcels
^_
70149662A
@A
@A
@A
@A
@A
@A
@A
@A
@A@A
@A
@A
ED
ED
ED
"#
Shed
BuckhornGeneralStore
W . Academy St. (NC Hwy 42)Patio
Grass
Grass
Grass
Asphalt
Asphalt
AsphaltMW-196.55
MW-296.84
MW-387.53
MW-595.87
MW-688.91
MW-788.94
MW-1A97.46
MW-2A87.60
MW-3A98.54
MW-4A97.13
MW-5A96.03
MW-487.6898
969094928888WSW-3
WSW-2
WSW-1
N:\ENV_EH&S\Env\GIS\Projects\2014\70149662 - Adam's Place State Lead\T_project\mxd\2019-10 Figs (TA-03)\70149662A_Fig4_GWElev_Oct2019.mxdFigureProject No.
Reviewed By:
Date:
Drawn By:JWW
2401 Brentwood Rd.Raleigh, NC 27604
PH. [phone] terracon.com
4 N:\ENV_EH&S\Env\GIS\Projects\2014\70149662 - Adam's Place State Lead\T_project\mxd\2019-10 Figs (TA-03)\70149662A_Fig4_GWElev_Oct2019.mxd0 40 8020Feet
Notes:- Elevations based on arbitrary datum of 100.00 feet - Elevation contour is dashed where inferred
Data Sources:- Well & Feature Locations - Henry Nemargut Eng. Services- Site Boundary & Street Centerline - Wake County GIS
Groundwater Elevation Map(October 2019)
³
WOF
October 2019
ADAM'S PLACEINCIDENT #182061208 W. ACADEMY STREETFUQUAY-VARINA, NC
@A Monitoring Well
ED Water Supply Well (Active)
ED Water Supply Well (Inactive)
Site Boundary
"#Elevation Benchmark
^_
70149662A
Groundwater Flow Direction
Groundwater Elevation Contour(dashed where inferred)
Groundwater Elevation (ft)99.20
@A @A
@A
@A
@A
@A
@A
@A
@A@A
@A
@A
ED
ED
EDShed
BuckhornGeneralStore
W . Academy St. (NC Hwy 42)Patio
Grass
Grass
Grass
Asphalt
Asphalt
Asphalt
WSW-2 WSW-3
MW-1Benzene-4,600Ethtylbezene-2,700Isopropylbenzene-120Naphthalene-600n-Propylbenzene-290Toluene-30,0001,2,4-trimethylbenzene-3,2001,3,5-trimethylbenzene-820Total Xylenes-18,200
MW-2BDL
MW-3Benzene-0.68Methyl tert-Butyl Ether-2.6
MW-4Benzene-1,000Ethylbenzene-260Isopropylbenzene-13Methyl tert-Butyl Ether-450Naphthalene-39n-Propylbenzene-24Toluene-1701,2,4-Trimethylbenzene-1701,3,5-Trimethylbenzene-19Total Xylenes-280
MW-5Benzene-3,200Ethylbenzene-700Isopropylbenzene-31Methyl tert-Butyl Ether-26Naphthalene-140n-Propylbenzene-73Toluene-4,6001,2,4-Trimethylbenzene-5301,3,5-Trimethylbenzene-120Total Xylenes-2,740
MW-1AMethyl tert-Butyl Ether-0.44 J
MW-2ABenzene-350n-Butylbenzene-3.4sec-Butylbenzene-2.81,2-Dichloroethane-2.3 JDiisopropyl Ether-12Ethylbenzene-300Isopropylbenzene-17Methyl tert-Butyl Ether-18Naphthalene-69n-Propylbenzene-30Toluene-131,2,4-Trimethylbenzene-39Total Xylenes-102.9
MW-3ABDL
MW-4ABDL
MW-5ABenzene-1.2Methyl tert-Butyl Ether-3.8
WSW-1
MW-6Benzene-220n-Butylbenzene-11Diisopropyl Ether-4.7 JEthylbenzene-68Isopropylbenzene-5.8Methyl tert-Butyl Ether-220Naphthalene-89n-Propylbenzene-200Toluene-181,2,4-Trimethylbenzene-3701,3,5-Trimethylbenzene-150Total Xylenes-750
MW-7Benzene-6.81,2-Dichloroethane-5.8Diisopropyl Ether-29Methyl tert-Butyl Ether-530
N:\ENV_EH&S\Env\GIS\Projects\2014\70149662 - Adam's Place State Lead\T_project\mxd\2019-10 Figs (TA-03)\70149662A_Fig5_GWAnlytl_Oct2019.mxdFigureProject No.
Reviewed By:
Date:
Drawn By:JWW
2401 Brentwood Rd.Raleigh, NC 27604
PH. [phone] terracon.com
5 N:\ENV_EH&S\Env\GIS\Projects\2014\70149662 - Adam's Place State Lead\T_project\mxd\2019-10 Figs (TA-03)\70149662A_Fig5_GWAnlytl_Oct2019.mxd0 45 9022.5 Feet
Notes:- Concentrations are in micrograms per liter (µg/L)- BDL = below detection limits-Bolded concentration exceed 2L Standards-J = estimated value below reporting limit and above method detection limit
Data Sources:- Well & Feature Locations - Henry Nemargut Eng. Services- Site Boundary & Street Centerline - Wake County GIS
Groundwater Analytical Results(October 2019)
³
CMP
November 2019
ADAM'S PLACEINCIDENT #182061208 W. ACADEMY STREETFUQUAY-VARINA, NC
@A Monitoring Well
Water Supply Well
ED Active
ED Inactive
Site Boundary
Tax Parcels
^_
70149662A
WSW-3BDL
@A
@A
@A
@A
@A
@A
@A
@A
@A@A
@A
@A
ED
ED
ED
WSW-2 WSW-3
MW-14,600
MW-2<0.50
MW-30.68
MW-41,000
MW-53,200
MW-1A<0.50
MW-2A350
MW-3A<0.50
MW-4A<0.50
MW-5A1.2
WSW-1
MW-6220
MW-759
<0.50
1
10
100
1,000
N:\ENV_EH&S\Env\GIS\Projects\2014\70149662 - Adam's Place State Lead\T_project\mxd\2019-10 Figs (TA-03)\70149662A_Fig6_BenzeneIso_Oct2019.mxdFigureProject No.
Reviewed By:
Date:
Drawn By:JWW
2401 Brentwood Rd.Raleigh, NC 27604
PH. [phone] terracon.com
6 N:\ENV_EH&S\Env\GIS\Projects\2014\70149662 - Adam's Place State Lead\T_project\mxd\2019-10 Figs (TA-03)\70149662A_Fig6_BenzeneIso_Oct2019.mxd0 40 8020Feet
Notes:- Concentrations are in micrograms per liter (µg/L)- "<" indicates below laboratory reporting limit- "J" indicates estimated value below reporting limit and abovemethod detection limit
Data Sources:- Well & Feature Locations - Henry Nemargut Eng. Services- Site Boundary & Street Centerline - Wake County GIS
Benzene Isoconcentration Map(October 2019)
³
WOF
November 2019
ADAM'S PLACEINCIDENT #182061208 W. ACADEMY STREETFUQUAY-VARINA, NC
@A Monitoring Well
Water Supply Well
ED Active
ED Inactive
Site Boundary
^_
70149662A
Benzene Isocontours(Dashed where inferred)
@A
@A
@A
@A
@A
@A
@A
@A
@A@A
@A
@A
ED
ED
EDShed
BuckhornGeneralStore
W . Academ y St. (NC Hwy 42)Patio
Grass
Grass
Grass
Asphalt
Asphalt
Asphalt
WSW-2 WSW-3
MW-1<100
MW-2<0.50
MW-32.6
MW-4450
MW-526
MW-1A0.44J
MW-2A18
MW-3A<0.50
MW-4A<0.50
MW-5A3.8
WSW-1
MW-6220
MW-7530
<0.50
20100
400
N:\ENV_EH&S\Env\GIS\Projects\2014\70149662 - Adam's Place State Lead\T_project\mxd\2019-10 Figs (TA-03)\70149662A_Fig7_MTBEIso_Oct2019.mxdFigureProject No.
Reviewed By:
Date:
Drawn By:JWW
2401 Brentwood Rd.Raleigh, NC 27604
PH. [phone] terracon.com
7 N:\ENV_EH&S\Env\GIS\Projects\2014\70149662 - Adam's Place State Lead\T_project\mxd\2019-10 Figs (TA-03)\70149662A_Fig7_MTBEIso_Oct2019.mxd0 40 8020
Feet
Notes:- Concentrations are in micrograms per liter (µg/L)- MTBE = Methyl tert-Butyl Ether- "<" indicates below laboratory reporting limit
Data Sources:- Well & Feature Locations - Henry Nemargut Eng. Services- Site Boundary & Street Centerline - Wake County GIS
MTBE Isoconcentration Map(October 2019)
³
WOF
November 2019
ADAM'S PLACEINCIDENT #182061208 W. ACADEMY STREETFUQUAY-VARINA, NC
@A Monitoring Well
Water Supply Well
ED Active
ED Inactive
Site Boundary
^_
70149662A
MTBE Isocontour(Dashed where inferred)
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
!
!
!
!
!
!
!
!
!
!
!
!
!
!
MW-7
MW-6
MW-5
MW-4
MW-3
MW-2
MW-1
MW-5A
MW-3A
MW-2A
MW-1A
N:\ENV_EH&S\Env\GIS\Projects\2014\70149662 - Adam's Place State Lead\T_project\mxd\2019-10 Figs (TA-03)\70149662A_IndoorAirScreening_Oct2019.mxdFigureProject No.
Reviewed By:
Date:
Drawn By:DWH
2401 Brentwood Rd.Raleigh, NC 27604
PH. [phone] terracon.com
8 N:\ENV_EH&S\Env\GIS\Projects\2014\70149662 - Adam's Place State Lead\T_project\mxd\2019-10 Figs (TA-03)\70149662A_IndoorAirScreening_Oct2019.mxdNotes:- Lines within building footprint represent different rooms/canopy regions- ppb: parts per billion- Refer to Figure 2 for AST/UST detailsData Sources:- Well & Feature Locations - Henry Nemargut Eng. Services- Site Boundary - Wake County GIS- Imagery - ESRI WMS
Indoor Air Screening Results (October 2019)³
JLF
November 2019
ADAM'S PLACEINCIDENT #182061208 W. ACADEMY STREETFUQUAY-VARINA, NC
!PID greater than 200
!PID 150-200
!PID 100-150
@A Monitoring Well
Water Supply Well
ED Active
ED Inactive
Site Boundary
UST (Tank ID: 1)
Former UST (Tank ID: 2)
Former AST Farm/UST Basin (Tank ID: 3, 4 & 5)
Former UST (Tank ID: 6)
UST (Tank ID: 7 & 8)
Building Footprint
^_
70149662A
BuckhornGeneralStore
Canopy
W . Academy St. (NC Hwy 42)Canopy
Wooded
Grass
Grass
Grass
PID Reading (ppb)
0 10 205Feet
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
W
W
W
#
#ððMW-7
MW-6
MW-5
MW-4
MW-3
MW-2
MW-1
MW-5A
MW-3A
MW-2A
MW-1A
N:\ENV_EH&S\Env\GIS\Projects\2014\70149662 - Adam's Place State Lead\T_project\mxd\2019-10 Figs (TA-03)\70149662A_Fig 9_Vapor Sample Location Map.mxdFigureProject No.
Reviewed By:
Date:
Drawn By:JWW
2401 Brentwood Rd.Raleigh, NC 27604
PH. [phone] terracon.com
9 N:\ENV_EH&S\Env\GIS\Projects\2014\70149662 - Adam's Place State Lead\T_project\mxd\2019-10 Figs (TA-03)\70149662A_Fig 9_Vapor Sample Location Map.mxdNotes:- Lines within building footprint represent different rooms/canopy regions- Refer to Figure 2 for AST/UST detailsData Sources:- Well & Feature Locations - Henry Nemargut Eng. Services- Site Boundary - Wake County GIS- Imagery - ESRI WMS
Indoor Air and Sub-Slab SampleLocation Map (October 2019)
³
JLF
October 2019
ADAM'S PLACEINCIDENT #182061208 W. ACADEMY STREETFUQUAY-VARINA, NC
@A Monitoring Well
Water Supply Well
ED Active
ED Inactive
Site Boundary
UST (Tank ID: 1)
Former UST (Tank ID: 2)
Former AST Farm/UST Basin (Tank ID: 3, 4 & 5)
Former UST (Tank ID: 6)
UST (Tank IDs: 7 and 8)ðOutdoor Air Sample Location
ðCrawlspace Sample Air Location
#Sub-slab Soil Vapor Sample Location
W Ambient Air Sample Location
Building Footprint
^_
70149662A
BuckhornGeneralStore
Canopy
W . Academy St. (NC Hwy 42)Canopy
SV01
IA01
IA03
CA01
SV02 IA02
OA-03
Wooded
Grass
Grass
Grass
0 10 205Feet

TABLES
3 diesel USTs, 2 gasoline USTs, and a 1,000 abandoned in-place UST
Yes - releases confirmed adjacent to former dispenser island
Information not available
Gasoline AST overfill in 2003
Piedmont
Residual Impacts Yes - above soil-to-groundwater but below residential MSCCs
Extent Vicinity of former dispenser island and to east (near MW-1, 4, and 5)
Contaminants of Concern Petroleum VOCs & SVOCS
Concentrations Above soil-to-groundwater MSCCS and below residential MSCCs
Soil Type Coarse to medium grained sand (covered by asphalt and concrete)
Residual Impacts Yes - above residential MSCCs
Extent Vicinity of former dispenser island and to east (near MW-1, 4 and 5)
Contaminants of Concern Petroleum VOCs & SVOCs including benzene and benzo(a)pyrene
Concentrations Above soil-to-groundwater MSCCS and saturated soil above residential MSCCs
Soil Type Sandy and silty clay
Source to GW?Yes - soil concentrations greater than soil-to-groundwater MSCCs
NAPL Present? Residual or Mobile?Yes - residual free product in soil near MW-1, 4, and 5, but not present in wells
Depth to Groundwater <1 to 10 feet below land surface
Hydraulic Conductivity Unknown
Delineated? If so, extent?Not delineated to southeast or vertically
Extend Off-Site?Extends off-site to souteast
Contaminants of Concern BTEX, MTBE, naphthalene, and other petroleum compounds
Concentrations Benzene historically above GCL (MW-1), other VOCs >10x the 2L Standard
Trends Concentrations slightly increasing or generally stable since 2010
Horizontal Gradient Approximately 0.01 to 0.1 ft/ft
Vertical Gradient Unknown
Depth to Groundwater
Delineated? If so, extent?
Extends Off-Site?
Hydraulic Conductivity
Contaminants of Concern
Concentrations
Trends
Horizontal Gradient
Approximately 600 feet west-southwest (tributary of Kenneth Creek)
Lateral Distance from Impacts to Building Beneath building
Depth to GW <1 to 10 feet below land surface
Precluding Factors Present? Specify.1,2-DCA (lead scavenger) detections in groundwater
GW Concentrations > VISLs?Yes
Exterior Soil Gas Concentrations >VISLs?Not Sampled
Sub-Slab/Crawlspace Concentrations > VISLs?Concentrations below VISLs. Paired data inconclusive (June 2016 data suggests complete
pathway, April 2019 does not)
Indoor Air Concentrations > VISLs?Yes - benzene, ethylbenzene, and 1,2,4-trimethylbenzene (historically) >non-residential IASLs
Is the VI Pathway Complete?Incconclusive - June 2016 data indicates compelte pathway, April 2019 data does not
Soil excavations in 2003 following release from an AST and in 2014 as part of UST closure.
Confirmation soil samples indicated concentration above soil-to-groundwater MSCCs remain in
vicinity of former dispensers.
Groundwater remediation not attempted
Number within 250 feet 1 active and 2 inactive
Number within 250-500 feet 5 active
Number within 500-1,000 feet 4 active
Tributary of Kenneth Creek, approximately 600 ft from source area
On-site store employees
Non-Residential - currently retail (Buckhorn General Store)
Concentrations above Residential MSCCs - close with deed restriction
NAPL and/or >GCLs Residual NAPL & GCLs present; reduce concentrations (potentially via excavation or active
remediation)
Water Supply Wells Abandon water supply wells
Low risk based on distance >500 ft (NCDEQ UST Guidance)
Further evaluation of VI Pathway necessary
Notes:
MSCC: NCDEQ maximum soil contaminant concentrations UST: underground storage tank PCE: tetrachloroethene
2L Standard: 15A NCAC 2L groundwater quality standards NA: not applicable TCE: trichloroethene
GCL: NCDEQ gross contamination levels GW: groundwater
VISL: NCDEQ vapor intrusion screening levels VOC: volatile organic compound
NAPL: non-aqueous phase liquid SVOC: semi-volatile organic compound
NCDEQ UST Guidance: NCDEQ UST Section Guidelines for Assessment BTEX: benzene, toluene, ethylbenzene, xylenes
and Corrective Action for UST Releases DCA: dichloroethane
VI: Vapor Intrusion
Table 1
Conceptual Site Model
Adam's Place (Incident #18206)
1208 West Academy Street, Fuquay-Varina, North Carolina
Terracon Project Number: 70149662A
Source
Areas
UST(s)
Dispensers
Piping
Other SubsurfaceGroundwaterSurficialNot Sampled
BedrockSoilPhysiographic Province
SurficialSurfaceWaterDistance from Source
Contaminants of Concern
Not Sampled Concentrations
Groundwater or Surficial Source?Soil VaporScreeningAssessmentRemediationSoil (Type, When, Successful?)
Groundwater (Type, When, Successful?)ReceptorsWSWsSurface Water (Modeling/Screening or Empirical)
Vapor Intrusion (Modeling/Screening or Empirical)Closure PathwayCurrent/Proposed Property Use
Soil
GWSurface Water
Vapor Intrusion
WSW-1 Myrtle R. Pearce 15 Victoria Hills Drive
Fuquay-Varina, NC 27526
1208 West Academy Street
Fuquay-Varina, NC 27526 110 feet / north (on-site)Inactive 0646948767
WSW-2 Myrtle R. Pearce 15 Victoria Hills Drive
Fuquay-Varina, NC 27526
1208 West Academy Street
Fuquay-Varina, NC 27526 140 feet / northeast (on-site)Inactive 0646948767
WSW-3 Myrtle R. Pearce 15 Victoria Hills Drive
Fuquay-Varina, NC 27526
1200 West Academy Street
Fuquay-Varina, NC 27526 180 feet / northeast Potable 0656040816
WSW-4 Jane Hawkins 2320 Fleming Road
Fuquay-Varina, NC 27526
2320 Fleming Road
Fuquay-Varina, NC 27526 350 feet / north Potable 0646959100
WSW-5 Maria and Alicia Chavarria 2316 Fleming Road
Fuquay-Varina, NC 27526
2316 Fleming Road
Fuquay-Varina, NC 27526 325 feet / northeast Potable 0656050165
WSW-6 Larry S. Godwin 2312 Fleming Road
Fuquay-Varina, NC 27526
2312 Fleming Road
Fuquay-Varina, NC 27526 470 feet / northeast Potable 0656051293
WSW-7 Larry S. Godwin 2312 Fleming Road
Fuquay-Varina, NC 27526
2312 Fleming Road
Fuquay-Varina, NC 27526 480 feet / northeast Irrigation 0656051293
WSW-8 Larry S. Godwin 2312 Fleming Road
Fuquay-Varina, NC 27526
2308 Fleming Road
Fuquay-Varina, NC 27526 580 feet / northeast Potable 0656053122
WSW-9 Raymond B Mason 662 Portabella Lane
Mariette, GA 30068
1134 West Academy Street
Fuquay-Varina, NC 27526 710 feet / northeast Potable 0656054280
WSW-10 Linda Winn 1116 West Academy Street
Fuquay-Varina, NC 27526
1116 West Academy Street
Fuquay-Varina, NC 27526 900 feet / northeast Potable 0656056256
WSW-11 Raymond B. Mason 377 Fleming Loop Road
Fuquay-Varina, NC 27526
377 Fleming Loop Road
Fuquay-Varina, NC 27526 1,050 feet / east Potable 0656241907
WSW-12 Hartshorn Properties LLC 1205 West Academy Street
Fuquay-Varina, NC 27526
1205 West Academy Street
Fuquay-Varina, NC 27526 365 feet / east Potable 0656042743
WSW-13 Cozart Farm LLC 609 S. Franklin Street
Whiteville, NC 28472
2408 Fleming Road
Fuquay-Varina, NC 27526 690 feet / north-northwest Potable 0646958748
WSW-14 Phillip and Grace Brown 2412 Fleming Road
Fuquay-Varina, NC 27526
2412 Fleming Road
Fuquay-Varina, NC 27526 1,135 feet / northwest Potable 0646951578
WSW-15 David and Wendy Doncaster 621 Lakehurst Road
Fuquay-Varina, NC 27526
621 Lakehurst Road
Fuquay-Varina, NC 27526 1,325 feet / northwest Potable 0646859588
WSW-16 Howard and Brenda Brooks P.O. Box 602
Fuquay-Varina, NC 27526
617 Lakehurst Road
Fuquay-Varina, NC 27526 1,450 feet / northwest Potable 0646859892
Adam's Place (Incident #18206)
1208 West Academy Street, Fuquay-Varina, North Carolina
Terracon Project Number: 70149662A
Table 2
Water Supply Well Information
Well Status/Use Parcel IDWell No.Property Owner Mailing Address Property Address Distance/Directions from
source area
Well ID
Date Water Level
Measured
Well Casing Depth
(ft. BGS)
Screened Interval
(x to y ft. BGS)
Bottom of Well
(ft. BGS)
Top of Casing
Elevation (ft.)
Depth to Water
from Top of
Casing (ft.)
Free Product
Thickness (ft.)
Groundwater
Elevation (ft.)Comments
06/17/10 99.71 4.56 -95.15
10/14/11 4.24 -95.44
04/04/13 2.85 -96.83
09/18/14 2.87 -96.81
03/24/15 2.27 -97.41
02/29/16 2.21 -97.47
04/27/17 2.62 -97.06
12/14/17 3.68 -96.00
04/30/19 2.53 -97.15
10/29/19 3.13 -96.55
06/17/10 3.33 -96.98
10/14/11 4.65 -95.66
04/04/13 4.16 -96.15
09/18/14 3.09 -97.22
03/24/15 2.27 -98.04
02/29/16 2.54 -97.77
04/27/17 2.94 -97.37
12/13/17 3.92 -96.39
04/30/19 2.85 -97.46
10/29/19 3.47 -96.84
10/14/11 13.73 -85.01
04/04/13 9.65 -89.09
09/18/14 8.70 -90.04
03/24/15 7.13 -91.61
02/19/16 7.28 -91.46
04/27/17 7.55 -91.19
12/12/17 10.27 -88.47
04/30/19 8.66 -90.08
10/29/19 11.21 -87.53
10/14/11 12.30 -86.86
04/04/13 9.66 -89.50
09/18/14 8.29 -90.87
03/24/15 6.81 -92.35
02/29/16 6.29 -92.87
04/27/17 8.17 -90.99
12/14/17 10.70 -88.46
04/30/19 8.39 -90.77
10/29/19 11.48 -87.68
10/14/11 10.90 -88.22
04/04/13 3.05 -96.07
09/18/14 2.77 -96.35
03/23/15 2.24 -96.88
02/29/16 2.36 -96.76
04/27/17 3.89 -95.23
12/14/17 3.63 -95.49
04/30/19 2.71 -96.41
10/29/19 3.25 -95.87
03/24/15 5.59 -92.91
02/29/16 5.66 -92.84
04/27/17 4.60 -93.90
12/13/17 9.01 -89.49
04/30/19 5.11 -93.39
10/29/19 9.59 -88.91
03/24/15 4.88 -93.40
02/29/16 5.61 -92.67
04/27/17 5.35 -92.93
12/13/17 8.90 -89.38
04/30/19 6.13 -92.15
10/29/19 9.34 -88.94
Notes:
"-" indicates a measurable amount of free product was not detected
Groundwater elevations adjusted for measurable free product by using the following calculation: (TOC Elevation - Depth to water) + (FP thickness * 0.729)
0.729 is the specific gravity for automotive gasoline
Elevations based on an arbitrary datum of 100.00 feet with a benchmark set on a concrete pad near a telephone pole (Figure 3). This datum was set by
S&ME in July 2010.
Table 3
Monitoring Well Construction Information and Historical Groundwater Elevations
Adam's Place (Incident #18206)
1208 West Academy Street, Fuquay-Varina, North Carolina
Terracon Project Number: 70149662A
13.03.0 - 13.03.0 100.31
MW-7
MW-6
98.2813.03.0 - 13.03.0
MW-5
MW-4
MW-3
MW-2
3.0 3.0 - 13.0
MW-1 99.6812.02.0 - 12.02.0
5.0 5.0 - 15.0 15.0 99.16
13.0 98.50
99.1215.05.0 - 15.05.0
98.7420.010.0 - 20.010.0
Type II
Type II
Type II
Type II
Type II
Type II
Type II
08/27/14 2.00 -97.63
09/18/14 2.20 -97.43
03/26/15 0.70 -98.93
02/29/16 0.81 -98.82
04/27/17 0.98 -98.65
12/12/17 3.22 -96.41
04/30/19 1.01 -98.62
10/29/19 2.17 -97.46
08/27/14 8.43 -90.54
09/18/14 8.43 -90.54
03/24/15 6.96 -92.01
02/29/16 7.19 -91.78
04/27/17 7.92 -91.05
12/13/17 10.67 -88.30
04/30/19 8.73 -90.24
10/29/19 11.37 -87.60
08/27/14 2.08 -99.43
09/18/14 1.94 -99.57
03/26/15 0.80 -100.71
02/29/16 0.66 -100.85
04/27/17 2.31 -99.20
12/12/17 3.80 -97.71
04/30/19 1.46 -100.05
10/29/19 2.97 -98.54
08/27/14 2.46 -97.37
09/18/14 2.66 -97.17
03/24/15 1.01 -98.82
02/29/16 0.96 -98.87
04/27/17 1.05 -98.78
12/12/17 3.79 -96.04
04/30/19 1.27 -98.56
10/29/19 2.70 -97.13
08/27/14 6.50 -92.99
09/18/14 6.78 -92.71
03/24/15 2.79 -96.7
02/29/16 2.84 -96.65
04/27/17 3.38 -96.11
12/12/17 5.57 -93.92
04/30/19 2.90 -96.59
10/29/19 3.46 -96.03
Notes:
"-" indicates a measurable amount of free product was not detected
Groundwater elevations adjusted for measurable free product by using the following calculation: (TOC Elevation - Depth to water) + (FP thickness * 0.729)
0.729 is the specific gravity for automotive gasoline
Elevations based on an arbitrary datum of 100.00 feet with a benchmark set on a concrete pad near a telephone pole (Figure 3). This datum was set by
S&ME in July 2010.
MW-5A
MW-4A
MW-3A
MW-2A
MW-1A 2.50 2.5 - 12.5 12.5 99.63
99.8316.06.0 - 16.06.0
13.0 13.0 - 23.0 23.0 101.51
98.9722.512.5 - 22.512.5
Type II
Type II
Type II
Type II
Type II
Table 3
Monitoring Well Construction Information and Historical Groundwater Elevations
Adam's Place (Incident #18206)
1208 West Academy Street, Fuquay-Varina, North Carolina
Terracon Project Number: 70149662A
5.5 5.5 - 15.5 15.5 99.49
Well/Sample
I.D.
Date Collected
(mm/dd/yy)
6/17/2010 297 -----435 29.4 -20.7 123 87.2 -985 621 149 1,785
10/14/2011 4,680 -14.8 ---2,080 73.6 -80.7 314 205 -19,600 1,290 360 9,750
4/4/2013 6,500 91 J 23 J BDL --3,600 150 17 J 130 440 420 -32,000 3,400 930 20,200
9/18/2014 6,800 <27 <42 <44 <97 <90 2,500 100 <62 95 <60 240 <60 27,000 2,900 720 15,800
3/24/2015 6,300 <120 <120 <500 <120 <120 2,200 78 <120 <120 480 180 <120 29,000 1,700 400 11,100
2/29/2016 7,500 <250 <250 <250 <250 <250 3,300 130 J <250 <250 400 300 <120 44,000 2,100 560 18,500
4/27/2017 6,100 <50 <50 <50 <50 <50 3,400 140 <50 <50 480 360 <50 28,000 2,500 650 15,500
12/14/2017 5,600 <250 <250 <250 <250 <250 3,700 <250 <250 <250 550 420 <250 29,000 2,800 700 15,800
4/30/2019 4,300 <100 <100 <100 <100 <100 2,600 120 <100 <100 510 290 <100 28,000 2,900 720 18,000
10/29/2019 4,600 <100 <100 <100 <100 <100 2,700 120 <100 <100 600 290 <100 30,000 3,200 820 18,200
6/17/2010 BDL -BDL -BDL -BDL BDL -BDL BDL BDL BDL BDL BDL BDL BDL
10/14/2011 BDL -BDL -BDL -BDL BDL -BDL BDL BDL BDL BDL BDL BDL BDL
4/4/2013 BDL BDL BDL BDL -BDL BDL BDL BDL BDL BDL BDL -BDL BDL BDL BDL
9/18/2014 <0.079 <0.054 <0.084 <0.089 <0.19 <0.18 <0.092 <0.11 <0.12 <0.090 <0.12 <0.094 <0.12 <0.090 <0.18 <0.10 <0.18
3/23/2015 <0.50 <0.50 <0.50 <2.0 <1.0 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.5
2/29/2016 <0.50 <0.50 <0.50 <0.5 <0.5 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.0
4/27/2017 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
12/13/2017 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
4/30/2019 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
10/29/2019 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
10/14/2011 1.2 -BDL ---BDL BDL -6 BDL BDL -BDL BDL BDL 1.6
4/4/2013 0.86 BDL BDL BDL BDL BDL BDL BDL BDL 16 BDL BDL BDL BDL BDL BDL 0.17 J
9/18/2014 0.11 <0.054 <0.084 <0.089 <0.19 <0.18 <0.092 <0.11 <0.12 4.2 <0.12 <0.094 <0.12 <0.090 <0.18 <0.10 <0.18
3/24/2015 <0.50 <0.50 <0.50 <2.0 <1.0 <0.50 <0.50 <0.50 <0.50 3.3 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.5
2/29/2016 0.24 J <0.50 <0.50 <0.5 <0.5 <0.50 <0.50 <0.50 <0.50 3 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.0
4/27/2017 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
12/12/2017 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 3.2 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
4/30/2019 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 1.5 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
10/29/2019 0.68 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 2.6 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
10/17/2011 97.6 -2.2 ---83.2 5.7 -191 10.1 19.3 -242 115 32.1 389
4/4/2013 1,100 BDL BDL BDL -13 J 210 7.5 J BDL 2,500 BDL 14 J -24 J 290 BDL 195 J
9/18/2014 640 6.2 4.3 <0.89 <1.9 4.2 180 26 1.5 870 60 28 1.2 98 550 20 457.7
3/24/2015 600 3 3.2 <40 <10 7.4 J 170 17 <10 1,600 140 23 <10 170 360 19 372
2/29/2016 890 <10 5.1 J <10 <10 9.2 J 280 29 <10 1,400 110 35 <10 280 560 <10 929
4/27/2017 1,400 11 5.6 <5.0 <5.0 10 460 39 <5.0 1,000 130 55 <5.0 120 650 56 1,230 D
12/14/2017 1,600 <25 <25 <25 <25 <25 830 65 <25 770 290 90 <25 42 1200 150 2369
4/30/2019 990 <10 <10 <10 26 8.5 J 200 12 <10 670 47 24 <10 <10 180 12 297
10/29/2019 1,000 <10 <10 <10 <10 <10 260 13 <10 450 39 24 <10 <10 170 19 280
10/17/2011 BDL -BDL ---BDL BDL -BDL BDL BDL -BDL BDL BDL BDL
4/4/2013 BDL BDL BDL BDL -BDL BDL BDL BDL BDL BDL BDL -BDL BDL BDL BDL
9/18/2014 2,200 5.0 <4.2 <4.4 <9.7 <9.0 480 21 <6.2 28 <6.0 50 <6.0 3,200 420 87 1,850
3/23/2015 1,600 <50 <50 <200 <100 <50 450 22 <50 <50 200 51 <50 3,200 <50 80 1,740
2/29/2016 3,300 <25 <25 <25 <25 <25 760 <25 <25 37 110 61 <25 5,200 530 130 3,540
4/27/2017 2,600 21 25 <5.0 57 <5.0 450 22 6.2 17 88 50 15 4,000 360 82 1,720
12/14/2017 2,600 <25 <25 <25 <25 <25 510 25 <25 23 88 53 <25 3,800 380 89 1,930
4/30/2019 1,300 <10 <10 <10 34 <10 290 12 <10 <10 56 29 <10 2,000 210 49 1,170
10/29/2019 3,200 <10 <10 <10 <10 <10 700 31 <10 26 140 73 <10 4,600 530 120 2,740
1 70 70 0.02 0.4 70 600 70 25 20 6 70 70 600 400 400 500
5,000 6,900 8,500 50 400 70,000 84,500 25,000 11,700 20,000 6,000 30,000 70,000 260,000 28,500 25,000 85,500
Notes: Results in micrograms per liter (µg/L).J - estimated value below laboratory reporting limit and above method detection limit.
Petroleum compounds detected in one or more samples are shown. BDL - below laboratory detection limit.
'-' denotes not analyzed.
Gray shading denotes concentrations above 15A NCAC 2L groundwater standard (2L standard).
Yellow shading denotes concentrations above Gross Contamination Levels (GCLs).
Table 4
Summary of Groundwater Analytical Results
Adam's Place (Incident #18206)
1208 West Academy Street, Fuquay-Varina, North Carolina
Terracon Project Number: 70149662A
1,2-Dibromoethane (EDB)TolueneNaphthaleneMethyl tert-Butyl Ether (MTBE)n-PropylbenzeneDiisopropyl Ether (IPE)Xylenes (Total)1,3,5-TrimethylbenzeneMW-2
MW-1
Analytical Method
1,2,4-TrimethylbenzeneContaminant of Concern →p-IsopropyltolueneBenzeneEthylbenzeneIsopropylbenzenesec-Butylbenzenen-Butylbenzene1,2-DichloroethaneStyreneMW-5
MW-4
MW-3
2L Standard (µg/L)
GCL (µg/L)
Well/Sample
I.D.
Date Collected
(mm/dd/yy)1,2-Dibromoethane (EDB)TolueneNaphthaleneMethyl tert-Butyl Ether (MTBE)n-PropylbenzeneDiisopropyl Ether (IPE)Xylenes (Total)1,3,5-TrimethylbenzeneMW-1
Analytical Method
1,2,4-TrimethylbenzeneContaminant of Concern →p-IsopropyltolueneBenzeneEthylbenzeneIsopropylbenzenesec-Butylbenzenen-Butylbenzene1,2-DichloroethaneStyrene3/24/2015 520 23 16 <100 <50 <25 1,200 78 7.0 1,000 440 220 9.0 1,200 2,000 500 7,000
2/29/2016 440 <10 15 <10 <10 <10 910 79 <10 520 290 180 <10 500 1,500 390 4,700
4/27/2017 630 74 18 <10 <10 <10 1,400 110 <10 700 470 320 <10 1,400 2,800 770 8,200
12/13/2017 370 <25 <25 <25 <25 <25 840 76 <25 240 270 200 <25 260 1,600 410 4,220
4/30/2019 720 <25 <25 <25 25 <25 900 78 <25 720 300 200 <25 710 1,700 430 5,000
10/29/2019 220 11 <5.0 <5.0 <5.0 4.7 J 68 5.8 <5.0 220 89 7.8 <5.0 18 370 150 750
3/25/2015 79 <20 <20 <80 <40 34 <20 <20 <20 3,300 <20 <20 <20 <20 <20 <20 <60
2/29/2016 130 <10 <10 <10 <10 51 <10 5.4 J <10 2,400 25 <10 <10 <10 <10 <10 <10
4/27/2017 110 <2.5 <2.5 <2.5 13 53 4.1 5.8 <2.5 1,200 28 <2.5 <2.5 <2.5 <2.5 <2.5 2.2 J
12/14/2017 21 <10 <10 <10 9.4 34 <10 <10 <10 950 <10 <10 <10 <10 <10 <10 <10
4/30/2019 59 <10 <10 <10 11 33 <10 <10 <10 1,100 15 <10 <10 <10 <10 <10 <10
10/29/2019 6.8 <5.0 <5.0 <5.0 5.8 29 <5.0 <5.0 <5.0 530 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0
3/4/2014 11 BDL BDL --BDL 2.4 BDL BDL 2 0.84 0.56 -17 3.2 1.1 12
9/18/2014 <0.079 <0.054 <0.084 <0.089 <0.19 <0.18 <0.092 <0.11 <0.12 0.59 <0.12 <0.094 <0.12 <0.090 <0.18 <0.10 <0.18
3/26/2015 <0.50 <0.50 <0.50 <2.0 <1.0 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.5
2/29/2016 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.0
4/27/2017 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
12/13/2017 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
4/30/2019 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 0.45 J <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
10/29/2019 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 0.44 J <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
3/4/2014 48 BDL BDL --1.7 25 1.3 BDL 51 5.8 2.1 -150 16 3.3 85
9/18/2014 770 3.8 2.4 <1.8 30 34 340 15 <2.5 2,300 <2.4 31 9.8 1,200 270 34 640
3/24/2015 400 <10 <10 <40 <10 23 140 6.8 <10 1,800 71 13 <10 880 110 21 310
2/29/2016 690 <10 <10 <10 <10 33 350 16 <10 1,100 69 31 <10 1,600 200 41 730
4/27/2017 580 <2.5 2.1 J <2.5 <2.5 25 320 16 <2.5 260 72 31 <2.5 230 180 36 490
12/13/2017 440 <2.5 2.3 J <2.5 <2.5 19 300 17 <2.5 86 79 33 <2.5 85 130 20 385
4/30/2019 410 <5.0 <5.0 <5.0 15 16 300 14 <5.0 70 71 32 <5.0 260 140 15 359
10/29/2019 350 3.4 2.8 <2.5 2.3 J 12 300 17 <2.5 18 69 30 <2.5 13 39 <2.5 102.9
8/26/2014 BDL BDL BDL --BDL BDL BDL BDL BDL BDL BDL -BDL BDL BDL BDL
9/18/2014 <0.079 <0.054 <0.084 <0.089 <0.19 <0.18 <0.092 <0.11 <0.12 <0.090 <0.12 <0.094 <0.12 <0.090 <0.18 <0.10 <0.18
3/26/2015 <0.50 <0.50 <0.50 <2.0 <1.0 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.5
2/29/2016 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.0
4/27/2017 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
12/13/2017 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
4/30/2019 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
10/29/2019 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
8/26/2014 BDL BDL BDL --BDL 3.1 BDL BDL BDL 0.61 BDL -11 2.2 BDL 20
9/18/2014 <0.079 <0.054 <0.084 <0.089 <0.19 <0.18 <0.092 <0.11 <0.12 0.66 <0.12 <0.094 <0.12 <0.090 <0.18 <0.10 <0.18
3/24/2015 <0.50 <0.50 <0.50 <2.0 <1.0 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.5
2/29/2016 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.0
4/27/2017 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
12/12/2017 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
4/30/2019 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
10/29/2019 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
8/26/2014 5.4 BDL BDL --BDL 3 BDL BDL 20 2.3 BDL -11 3.3 0.5 21
9/18/2014 4.0 <0.054 <0.084 <0.089 <0.19 <0.18 <0.092 0.12 <0.12 19 7.2 <0.094 <0.12 0.17 0.96 <0.10 1.25
3/24/2015 4.4 <0.50 <0.50 <2.0 <1.0 <0.50 2.2 0.24 J <0.50 11 36 0.39 <0.50 12 4.3 0.67 10.5
2/29/2016 2.8 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 10 12 <0.50 <0.50 <0.50 0.83 <0.50 1.15
4/27/2017 1.8 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 6.2 1.1 <0.50 <0.50 <0.50 0.49 J <0.50 0.47 J
12/13/2017 0.78 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 3.7 0.93 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
4/30/2019 1.7 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 4.7 5.2 <0.50 <0.50 <0.50 0.46 J <0.50 0.47 J
10/29/2019 1.2 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 3.8 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
1 70 70 0.02 0.4 70 600 70 25 20 6 70 70 600 400 400 500
5,000 6,900 8,500 50 400 70,000 84,500 25,000 11,700 20,000 6,000 30,000 70,000 260,000 28,500 25,000 85,500
Notes: Results in micrograms per liter (µg/L).J - estimated value below laboratory reporting limit and above method detection limit.
Petroleum compounds detected in one or more samples are shown. BDL - below laboratory detection limit.
'-' denotes not analyzed.
Gray shading denotes concentrations above 15A NCAC 2L groundwater standard (2L standard).
Yellow shading denotes concentrations above Gross Contamination Levels (GCLs).
MW-7
MW-6
2L Standard (µg/L)
GCL (µg/L)
MW-5A
MW-4A
MW-3A
MW-2A
MW-1A
Well/Sample
I.D.
Date Collected
(mm/dd/yy)1,2-Dibromoethane (EDB)TolueneNaphthaleneMethyl tert-Butyl Ether (MTBE)n-PropylbenzeneDiisopropyl Ether (IPE)Xylenes (Total)1,3,5-TrimethylbenzeneMW-1
Analytical Method
1,2,4-TrimethylbenzeneContaminant of Concern →p-IsopropyltolueneBenzeneEthylbenzeneIsopropylbenzenesec-Butylbenzenen-Butylbenzene1,2-DichloroethaneStyrene6/17/2010 BDL -BDL -BDL -BDL BDL -BDL BDL BDL BDL BDL BDL BDL BDL
10/14/2011 BDL -BDL -BDL -BDL BDL -BDL BDL BDL BDL BDL BDL BDL BDL
4/4/2013 BDL BDL BDL BDL -BDL BDL BDL BDL BDL BDL BDL -BDL BDL BDL BDL
9/18/2014 <0.079 <0.054 <0.084 <0.089 <0.19 <0.18 <0.092 <0.11 <0.12 <0.090 <0.12 <0.094 <0.12 <0.090 <0.18 <0.10 <0.18
3/25/2015 <0.50 <0.50 <0.50 <2.0 <1.0 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.5
2/29/2016 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.0
4/27/2017 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.0
12/13/2017 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
4/30/2019 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
10/29/2019 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
10/17/2011 BDL -BDL -BDL -BDL BDL -BDL BDL BDL BDL BDL BDL BDL BDL
4/4/2013 BDL BDL BDL BDL -BDL BDL BDL BDL BDL BDL BDL -BDL BDL BDL BDL
10/17/2011 BDL -BDL -BDL -BDL BDL -BDL BDL BDL BDL BDL BDL BDL BDL
4/4/2013 BDL BDL BDL BDL -BDL BDL BDL BDL BDL BDL BDL -BDL BDL BDL BDL
10/17/2011 BDL -BDL -BDL -BDL BDL -BDL BDL BDL BDL BDL BDL BDL BDL
4/4/2013 BDL BDL BDL BDL -BDL BDL BDL BDL BDL BDL BDL -BDL BDL BDL BDL
10/14/2011 BDL -BDL -BDL -BDL BDL -BDL BDL BDL BDL BDL 1.6 BDL BDL
9/18/2014 <0.079 <0.054 <0.084 <0.089 <0.19 <0.18 <0.092 <0.11 <0.12 <0.090 <0.12 <0.094 <0.12 <0.090 <0.18 <0.10 <0.18
3/25/2015 <0.50 <0.50 <0.50 <2.0 <1.0 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.5
2/29/2016 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
4/27/2017 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
12/13/2017 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
4/30/2019 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
10/29/2019 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
1 70 70 0.02 0.4 70 600 70 25 20 6 70 70 600 400 400 500
5,000 6,900 8,500 50 400 70,000 84,500 25,000 11,700 20,000 6,000 30,000 70,000 260,000 28,500 25,000 85,500
Notes: Results in micrograms per liter (µg/L).J - estimated value below laboratory reporting limit and above method detection limit.
Petroleum compounds detected in one or more samples are shown. BDL - below laboratory detection limit.
'-' denotes not analyzed.
Gray shading denotes concentrations above 15A NCAC 2L groundwater standard (2L standard).
Yellow shading denotes concentrations above Gross Contamination Levels (GCLs).
GCL (µg/L)
WSW-6
2L Standard (µg/L)
WSW-4
WSW-5
WSW-12
WSW-3
Table 5
Summary of Indoor Air and Sub-Slab Soil Gas Analytical Results
Adam's Place (Incident #18206)
1208 West Academy Street, Fuquay-Varina, North Carolina
Terracon Project Number: 70149662A
Sample Type:
Sample ID:OA-01 OA-02 OA-03
Sample Date:06/23/16 04/30/19 10/29/19 06/23/16 04/30/19 10/29/19 06/23/16 04/30/19 10/29/19 06/22/16 04/30/19 10/29/19 06/22/16 04/30/19 10/29/19 06/22/16 04/30/19 10/29/19 06/22/19 04/30/19 10/29/19
Volatile Organic Compounds (VOCs) by Method TO-15
Benzene 30.7 <1.28 <0.639 <1.28 <1.28 1.06 1,600 1.36 <0.639 <0.639 6.05 2.04 13.5 1.64 0.978 5.69 1.76 1.03 5.72 1.6 <0.639 <0.639 <0.639
sec-Butylbenzene <27.6 <2.21 <1.10 3.76 <2.21 <1.10 NE <2.21 <1.1 <1.1 <1.10 <1.1 <1.10 <1.10 <1.1 <1.10 <1.10 <1.1 <1.10 NE <1.10 <1.1 <1.10
Ethylbenzene 32.5 <1.73 2.03 4.46 <1.73 1.33 4,900 <1.73 <0.867 <0.867 9.09 5.92 6.55 2.18 1.81 2.58 2.54 1.76 2.51 4.9 <0.867 <0.867 <0.867
Isopropylbenzene (Cumene)<24.6 <1.97 <0.983 2.74 <1.97 <0.983 35,000 <1.97 <0.983 <0.983 <0.983 <0.983 <0.983 <0.983 <0.983 <0.983 <0.983 <0.983 <0.983 350 <0.983 <0.983 <0.983
Methyl Tert-Butyl Ether --<1.44 <0.721 --<1.44 <0.721 47,000 --<0.721 <0.721 --<0.721 <0.721 --<0.721 <0.721 --<0.721 <0.721 47.00 --<0.721 <0.721
Naphthalene <82.7 <6.6 <3.30 10.3 B <6.6 <3.30 260 <6.60 <3.3 <3.3 <3.30 <3.3 <3.30 <3.30 <3.3 <3.30 <3.30 <3.3 <3.30 0.36 <3.30 <3.3 <3.30
n-Propylbenzene <24.5 <1.96 1.28 15.3 <1.96 <0.982 88,000 <1.96 <0.982 <0.982 2.67 2.2 1.65 <0.982 1.18 0.987 <0.982 1.18 <0.982 8,800 <0.982 <0.982 <0.982
Toluene 140 1.81 5.12 4.11 7.44 5.31 440,000 5.91 0.781 1.81 42.8 15.1 46.3 10.4 9.4 24.5 11.6 9.34 24.6 4,400 0.767 <0.753 1.04
1,2,4-Trimethylbenzene 72.5 2.43 7.9 287 2.43 6.04 5,300 4.92 B <0.982 <0.982 15.5 11.5 8.39 4.20 6.11 4.81 4.86 6.01 4.62 53 <0.982 <0.982 <0.982
1,3,5-Trimethylbenzene 26.9 <1.96 1.9 78.9 <1.96 1.57 5,300 <1.96 <0.982 <0.982 4.20 2.79 2.32 1.20 1.92 1.50 1.37 1.63 1.49 53 <0.982 <0.982 <0.982
Xylenes (Total)283.4 <3.47 12.07 60.9 <3.47 7.59 8,800 7.73 <1.73 <1.73 46.7 29.17 33.65 11.4 8.7 12.92 13.1 8.4 12.6 88 <1.73 <1.73 <1.73
Notes:
Samples ID's are color coded to match the corresponding paired sample location
A modified list of TO-15 compounds was analyzed based on petroleum compounds previously detected in the groundwater at the site.
Concentrations are in micrograms per cubic meter (µg/m3).
Concentrations in bold were detected above laboratory reporting limits.
Compounds detected in one or more samples are shown.
NE: Not established.
Cells are shaded if data indicate that the analyte was detected above its respective screening level. Outdoor air was not compared to screening levels.
Non-Residential Indoor Air Screening Level: NCDEQ Non-Residential Vapor Intrusion Screening Levels – Indoor Air Screening Concentrations (Feb. 2018).
Non-Residential Sub-Slab Screening Level: NCDEQ Non-Residential Vapor Intrusion Screening Levels – Sub-slab Soil Gas Screening Concentrations (Feb. 2018).
Outdoor AirNon-Residential
Sub-Slab &
Exterior Soil Gas
Screening Level
Non-Residential
Indoor Air Screening
Level
Crawl Space Air Sub-Slab Soil Vapor Indoor Air
SV-01 SV-02 CA-01 IA-01 IA-02 IA-03

APPENDIX A
PHOTOGRAPHS and FIELD NOTES

Subsequent Monitoring Report
Adam’s Place ■ Fuquay Varina, North Carolina
Photos Taken: October 29, 2019 ■ Terracon Project No. 70149662A

Photo #1 View of storefront

Photo #2 View of insecticides inside front store area
Subsequent Monitoring Report
Adam’s Place ■ Fuquay Varina, North Carolina
Photos Taken: October 29, 2019 ■ Terracon Project No. 70149662A

Photo #3 Additional view of insecticides inside front store area
Photo #4 View of herbicide inside front store area
Subsequent Monitoring Report
Adam’s Place ■ Fuquay Varina, North Carolina
Photos Taken: October 29, 2019 ■ Terracon Project No. 70149662A

Photo #5 View of cleaning supplies in interior bathroom

Photo #6 View of back storage area

Subsequent Monitoring Report
Adam’s Place ■ Fuquay Varina, North Carolina
Photos Taken: October 29, 2019 ■ Terracon Project No. 70149662A

Photo #7 View of gasoline containers in back storage area

Photo #8 View of diesel generator in back storage area
Subsequent Monitoring Report
Adam’s Place ■ Fuquay Varina, North Carolina
Photos Taken: October 29, 2019 ■ Terracon Project No. 70149662A

Photo#9 View of monitoring well MW-2 location
Photo#10 View of sub-slab vapor sample SV-02

APPENDIX B
LABORATORY ANALYTICAL RESULTS AND
CHAIN-OF-CUSTODY FORMS