FA-3787_29719_CA_MRP_20231030

2725 E. Millbrook Road, Suite 121
Raleigh, NC 27604
Telephone [phone]
www.atcgroupservices.com

October 30, 2023

Mr. Hassan Osman
North Carolina Department of Environmental Quality
Division of Waste Management – Underground Storage Tank Section
1646 Mail Service Center
Raleigh, North Carolina 27699

Subject: Free Product Recovery and Groundwater Monitoring Report
Salemburg Food Mart
801 North Main Street
Salemburg, Sampson County, North Carolina
NCDEQ Incident No. 29719

Dear Mr. Osman:

ATC Associates of North Carolina, P.C. (ATC) is submitting the enclosed Free Product Recovery and
Groundwater Monitoring Report for the Salemburg Food Mart site. The report presents investigative
procedures, field activities, and laboratory analytical results for drilling, a mobile multi-phase extraction (MMPE)
event, and a groundwater sampling event conducted between July 2023 and September 2023.

If you have any questions or require additional information, please contact our office at [phone].

Sincerely,
ATC Associates of North Carolina, P.C.

Corinne Lally Gabe Araos, P.E.
Project Scientist Branch Manager
Direct Line: 919-948-7379 Direct Line: 919-573-1205
Email: [e-mail] Email: [e-mail]

Attachments:
1. Free Product Recovery and Groundwater Monitoring Report

Prepared for:

North Carolina Department of Environmental Quality
Division of Waste Management – Underground Storage Tank Section
1646 Mail Service Center
Raleigh, North Carolina 27699

FREE PRODUCT RECOVERY AND GROUNDWATER MONITORING REPORT
SALEMBURG FOOD MART
801 NORTH MAIN STREET
SALEMBURG SAMPSON COUNTY, NORTH CAROLINA

ATC Project No. STL2971901

Prepared by:

ATC Associates of North Carolina, P.C.
2725 E. Millbrook Road, Suite 121
Raleigh, North Carolina 27604
Telephone [phone]

Corinne Lally
Project Scientist
Direct Line: 919-948-7379
Email: [e-mail]

Gabe Araos, P.E.
Branch Manager
Direct Line: 919-573-1205
Email: [e-mail]

October 30, 2023

Salemburg Food Mart
October 30, 2023
Page 1 of 7

Table of Contents
1.0 SITE IDENTIFICATION .......................................................................................................................... 2
2.0 EXECUTIVE SUMMARY ........................................................................................................................ 3
3.0 SITE DESCRIPTION .............................................................................................................................. 3
3.1 SITE CHARACTERIZATION .................................................................................................................................... 3
3.2 SITE BACKGROUND ............................................................................................................................................ 4
4.0 AIR SPARGE-ENHANCED MMPE ACTIVITIES ................................................................................. 5
4.1 AIR SPARGE-ENHANCED MMPE EVENT ................................................................................................................ 5
5.0 GROUNDWATER ASSESSMENT ACTIVITIES .................................................................................. 5
5.1 GROUNDWATER LEVELS...................................................................................................................................... 5
5.2 GROUNDWATER QUALITY ................................................................................................................................... 6
5.3 WATER SUPPLY WELLS ....................................................................................................................................... 6
6.0 CONCLUSIONS AND RECOMMENDATIONS .................................................................................... 7

TABLES:
Table 1 – Water Supply Well Information
Table 2 – Well Construction Details and Groundwater Elevation Data
Table 3 – Groundwater Analytical Data
Table 4 – Historical Groundwater Analytical Data
Table 5 – Field Parameters
Table 6 – Water Supply Well Analytical Data

FIGURES:
Figure 1 – Topographic Map
Figure 2 – Site Map
Figure 3 – Potential Receptor Map
Figure 4 – Groundwater Elevation Contour Map
Figure 5 – Benzene Isoconcentration Contour Map
Figure 6 – Additional Contaminants of Concern Map

APPENDICES:
Appendix A – Conceptual Site Model
Appendix B – Site Photographs
Appendix C – Field Notes
Appendix D – MMPE Report and Waste Disposal Manifests
Appendix E – Laboratory Analytical Results

Salemburg Food Mart
October 30, 2023
Page 3 of 7

ATC Project No. STL2971901 NCDEQ State Lead Program
2.0 EXECUTIVE SUMMARY

ATC Associates of North Carolina, P.C. (ATC) has completed an air sparge enhanced mobile multi-phase
extraction (AS-MMPE) event and a groundwater monitoring event for the Salemburg Food Mart site located
at 801 North Main Street in Salemburg, Sampson County, North Carolina. This report documents activities
conducted at the site between July 2023 and September 2023. The work was performed based a July 3,
2023, Task Authorization (TA-01) by the Trust Fund Branch of the Underground Storage Tank (UST)
Section, Division of Waste Management, North Carolina Department of Environmental Quality (NCDEQ).
The work is performed as part of State Lead Contract #N70522-B between NCDEQ and ATC.

The former Salemburg Food Mart site is located at 801 North Street, Salemburg, North Carolina. The site
is developed with one single-story building occupied by Discount Tobacco. Six monitoring wells (MW-1
through MW-6) are associated with the site. Two monitoring wells (Hills MW-8 and Hills MW-9) from the
adjacent Hills Grocery site (Incident # 5861) are also located on the property. Three water supply wells
were previously identified within 1,000 feet of the site, two of which function as municipal water supply wells
for the surrounding area.

From July 31, 2023 to August 4, 2023 Eastern Environmental Services, Inc. (Eastern) performed an air
sparge-enhanced MMPE event on wells MW-1R, MW-2R, AS-1, and AS-2. On September 6, 2023, ATC
returned to the site to collected groundwater samples from MW-1 through MW-6, as well as Town of
Salemburg water supply wells Well #1 and Well #2.

Based on the analytical results, multiple petroleum compounds were identified exceeding Title 15A NCAC
02L .0202 Groundwater Quality Standards (2L Standards). No compounds detected exceeded the Gross
Contamination Level (GCL). In Well #1, bromodichloromethane was detected above 2L Standards.
Naphthalene, acetone, chloroform, dibromochloromethane, and methyl chloride were detected below 2L
Standards in Well #1. Methyl chloride was detected below 2L Standards in Well #2.

ATC recommends performing a comprehensive groundwater sampling event within the next six months, to
ensure petroleum compounds remain below the GCL. The conceptual site model is included as Appendix
A.

3.0 SITE DESCRIPTION

3.1 SITE CHARACTERIZATION

The former Salemburg Food Mart site is located at 801 North Street in Salemburg, Sampson County, North
Carolina. The site is developed with one single-story building occupied by Discount Tobacco. The site is
bound to the east by North Main Street and to the south by Creation Lane. The properties immediately to
the north and west are vacant properties. Residential properties are located south and west of the site. The
Salemburg Fire Department and a boutique shop are located to the east, across North Main Street. The
Hills Grocery site (Incident # 5861) (currently a vacant lot) is located adjacent and south, across Creation
Lane. The surrounding properties are zoned Residential, Commercial, and Exempt. The UST system
formerly located on the property consisted of two 10,000-gallon gasoline USTs. The UST system was
closed by removal on September 12, 2019.

A Site Reconnaissance and Receptor Survey Letter Report submitted by S&ME, Inc. (S&ME) on August
17, 2018, identified three water supply wells within 1,000 feet of the site, two of which are used to provide
municipal water to the surrounding area. Water supply well ownership information is included in Table 1. A
site topographic map is included as Figure 1 and a site map depicting monitoring well locations and other
pertinent site features is included as Figure 2. A map showing water supply well locations is included as
Figure 3. Site photographs are included in Appendix B.

Salemburg Food Mart
October 30, 2023
Page 4 of 7

ATC Project No. STL2971901 NCDEQ State Lead Program
3.2 SITE BACKGROUND

In August 2011, a release was suspected after the installation of monitoring wells Hills MW-8 and Hills MW-
9 on the site property, which are associated with the adjacent Hills Grocery site (Incident #5861). In January
2012, a Site Check Report submitted to NCDEQ by East Coast Environmental, P.A. (East Coast)
documented the installation and sampling of monitoring wells MW-1 and MW-2. Analytical results indicated
a benzene concentration of 12,000 micrograms per liter (μg/L), exceeding GCLs, in MW-2. Multiple
compounds were detected in both MW-1 and MW-2 exceeding 2L Standards.

East Coast submitted a Phase I Limited Site Assessment Report (LSA) in March 2012 documenting the
installation and sampling of MW-3 and a receptor survey that identified municipal water supply wells Well
#1 and Well #2. Analytical results indicated petroleum compounds at concentrations exceeding 2L
Standards.

In February 2016 a Comprehensive Site Assessment (CSA)/Corrective Action Plan (CAP) was submitted
by East Coast documenting the installation of monitoring wells MW-4 and MW-5, and the sampling of MW-
1, MW-2, MW-3, MW-4, MW-5, Hills MW-8, and Hills MW-9. Analytical results indicated concentrations of
numerous petroleum compounds exceeding 2L Standards in multiple wells. Well MW-6 was subsequently
installed and indicated concentrations of petroleum compounds exceeding 2L Standards.

A Site Reconnaissance and Receptor Survey Letter Report submitted by S&ME on August 17, 2018,
identified two town water supply wells (Well #1 and Well #2) within 1,000 feet of the site. A representative
of the Town of Salemburg communicated to S&ME that the municipal water system was sampled and
analyzed for volatile organic compounds (VOCs) every three years. Samples were collected from the entry
point for all four water supply wells (Well #1 through Well #4) into the water treatment plant which serves
the Town of Salemburg. At the time of the Letter Report, water supply well Well #5 was constructed but not
connected to the municipal water system. In 2012, NCDEQ required the town to conduct quarterly sampling
after detection of concentrations of ethylbenzene and total xylenes. After additional sampling indicated no
concentrations of VOCs, NCDEQ allowed a reduction in sampling frequency to annually and then to every
three years.

The UST system was closed by removal on September 12, 2019, and an Initial Abatement Action Report
was submitted to the NCDEQ on December 17, 2019, detailing the event. No above ground storage tanks
(ASTs) were observed at the site. During closure activities, photo-ionization detector screening indicated
petroleum impacted soils at the pump island and the western end of the UST basin. Soil sampling indicated
the presence of multiple compounds exceeding Soil-to-Groundwater Maximum Soil Contaminant
Concentrations (MSCCs) around the dispensers. Approximately 362.40 tons of impacted soils were
excavated during the UST closure activities. Monitoring wells MW-1 and MW-2 were destroyed during UST
closure activities.

A Groundwater Monitoring Report submitted by S&ME on February 6, 2020, detailed two sampling events
in December 2019 and the installation of monitoring wells MW-1R and MW-2R to replace previously
destroyed wells. Analytical results from the sampling event continued to indicate the presence of petroleum
compounds in multiple monitoring wells in exceedance of 2L Standards. Well MW-2R contained benzene
at a concentration of 6,700 μg/L, exceeding the GCL.

A Groundwater Monitoring Report submitted by ATC on April 29, 2021, detailed a March 2021 sampling
events conducted on the six monitoring wells associated with the site and two water supply wells used by
the Town of Salemburg as municipal water sources. Analytical results from the sampling event continued
to indicate the presence of petroleum compounds in multiple monitoring wells in exceedance of 2L
Standards. Chloroform was detected in water supply well Well #1 below 2L Standards. No compounds were
found at concentrations exceeding GCLs. ATC recommended reviewing remedial activities and installing a
Type III well to vertically delineate groundwater impacts.

Salemburg Food Mart
October 30, 2023
Page 5 of 7

ATC Project No. STL2971901 NCDEQ State Lead Program
A Groundwater Monitoring Report submitted by ATC on May 16, 2022, detailed the installation of air sparge
wells AS-1 and AS-2, an air sparge-enhanced MMPE event, and subsequent sampling event. Benzene in
monitoring well MW-2R exceeded the GCLs. Xylenes, naphthalene, 1,2,4-trimethylbenzene, and 1,3,5-
trimethylbenzene were detected at concentrations below 2L Standards in Well #1. ATC recommended
performing an additional air sparge-enhanced MMPE event followed by a limited sampling event.

4.0 AIR SPARGE-ENHANCED MMPE ACTIVITIES

4.1 AIR SPARGE-ENHANCED MMPE EVENT

Eastern was subcontracted to perform an air sparge-enhanced MMPE event from July 31, 2023 to August
4, 2023. Monitoring wells MW-1R and MW-2R were used as the extraction points for the event. Air was
injected into air sparge wells AS-1 and AS-2 in order to aid in volatilization of contaminants in the
groundwater. The event was conducted to reduce groundwater contaminant concentrations. Prior to the
event, wells MW-1R, MW-2R, AS-1, and AS-2 were gauged to record the groundwater elevation. Light non-
aqueous phase liquid (LNAPL) was not detected in any of the monitoring wells. Monitoring well construction
details and groundwater elevation data are included as Table 2.

Prior to the start of the event, the intake for the vacuum piping was set approximately 14 feet below the top
of casing in the extraction wells and was adjusted throughout the event to maximize volume recovery. The
air sparge-enhanced MMPE event was initiated at 10:00 am on July 31, 2023.

The event was concluded at 10:00 a.m. on August 4, 2023. A tanker change out was required on August
2, 2023. During that time, groundwater samples were collected from monitoring wells MW-1R and MW-2R.
Samples were collected in laboratory-approved containers, packed in ice and delivered under chain of
custody protocol to SGS North America, Inc. in Scott, Louisiana (SGS) for analyses. The groundwater
samples were analyzed for volatile organic compounds (VOCs) by Standard Method 602. Approximately
10,019 gallons of impacted groundwater and 218.16 gallons of petroleum vapor were recovered during the
event. Field notes are included as Appendix C. During the event, vacuum at the recovery pump stabilized
at 25 inches of mercury. Airflow rates ranged from 389 to 405 feet per minute. System temperature ranged
from 79 to 119 degrees Fahrenheit and humidity maintained 100 percent. Field gauged VOCs increased
from 1,519 parts per million (ppm) to 3,291 ppm throughout the event. The MMPE report and waste disposal
manifests are included as Appendix D. The laboratory analytical report and chain-of-custody forms are
included in Appendix E.

5.0 GROUNDWATER ASSESSMENT ACTIVITIES

5.1 GROUNDWATER LEVELS

ATC conducted a groundwater sampling event at the site on September 6, 2023. Groundwater level
measurements were collected from monitoring wells MW-1R through MW-6. Monitoring well construction
details and current and historical groundwater elevation data are summarized in Table 2. Measurable
LNAPL was not observed in any monitoring well. Depth to groundwater measurements ranged from 11.38
feet bgs in MW-2R to 12.04 feet bgs in MW-1R. Monitoring well locations are depicted in Figure 2. A
groundwater elevation contour map is included as Figure 4. Based on the September 2023 data,
groundwater flows northeast across the site, which is consistent with historical data. Field notes are
included in Appendix C.

Salemburg Food Mart
October 30, 2023
Page 6 of 7

ATC Project No. STL2971901 NCDEQ State Lead Program
5.2 GROUNDWATER QUALITY

Groundwater samples were collected from monitoring wells MW-1R through MW-6 on September 6, 2023.
The groundwater samples were collected in laboratory-approved containers, packed in ice and delivered
under chain of custody protocol to SGS analyses. The groundwater samples were analyzed for VOCs by
Standard Method 6200B.

The following petroleum hydrocarbon compounds were detected in the associated monitoring wells at
concentrations above the 2L Standards:

Benzene: MW-1R (1,030 μg/L), MW-2R (1,910 μg/L), MW-5 (280 μg/L), MW-6 (6.2 μg/L)
Toluene: MW-1R (3,690 μg/L), MW-2R (6,190 μg/L), MW-5 (1,390 μg/L)
Ethylbenzene: MW-1R (1,940 μg/L), MW-2R (1,450 μg/L), MW-5 (1,390 μg/L)
Total Xylenes: MW-1R (10,200 μg/L), MW-2R (7,310 μg/L), MW-5 (3,900 μg/L), MW-6 (566 μg/L)
Methyl tert-butyl ether: MW-2R (279 μg/L)
Naphthalene: MW-1R (821 μg/L), MW-2R (549 μg/L), MW-5 (372 μg/L), MW-6 (113 μg/L)
Isopropylbenzene: MW-1R (130 μg/L), MW-2R (99.3 μg/L), MW-5 (85.3 μg/L)
p-Isopropyltoluene: MW-5 (27.5 μg/L)
Methyl Chloride: MW-5 (37.8 μg/L)
n-Propylbenzene: MW-1R (395 μg/L), MW-2R (313 μg/L), MW-5 (253 μg/L)
1,2,3-Trichloropropane: MW-6 (13.3 μg/L)
1,2,4-Trimethylbenzene: MW-1R (3,230 μg/L), MW-2R (2,280 μg/L), MW-5 (1,710 μg/L), MW-6 (594 μg/L)
1,3,5-Trimethylbenzene: MW-1R (847 μg/L), MW-2R (587 μg/L), MW-5 (421 μg/L)
Vinyl chloride: MW-1R (10.3 μg/L)

No compounds detected exceeded the GCL. Current groundwater analytical data is summarized in Table
3. Historical groundwater analytical data is summarized in Table 4. Field parameters collected during the
sampling event are shown in Table 5. A Benzene Isoconcentration Contour Map is included as Figure 5.
An Additional Contaminants of Concern Map is included as Figure 6. The laboratory analytical report and
chain-of-custody forms are included in Appendix E.

Based on the results, it appears groundwater concentrations at the site have generally decreased or
remained stable in wells MW-1R, MW-2R, MW-5, and MW-6.

As part of ATC’s quality assurance and quality control (QA and QC) measures, a data review of the
laboratory report was conducted. During the review, it was concluded that samples were received by the
laboratory in acceptable condition and properly preserved. The samples were analyzed within the correct
holding times, and the chain of custody was properly completed by all parties. The laboratory QC report
shows an internal blank was analyzed for each method that was used for the original samples. The
laboratory fortified blank (LFB) and laboratory control sample (LCS) data results were also provided for
each analytical method. Refer to the laboratory report in Appendix E for details regarding QA results for
the laboratory samples and any noted exceptions. Overall, ATC concludes that the laboratory results are
usable and any exceptions do not significantly impact the conclusions presented in this report.

5.3 WATER SUPPLY WELLS

On September 6, 2023, ATC met with a representative of the Town of Salemburg to collect samples from
municipal water supply wells Well #1 and Well #2. The samples were collected in laboratory-approved
containers, packed in ice and delivered under chain of custody protocol to SGS for analyses. The samples
were analyzed for VOCs by Method 6200B.

Laboratory analysis detected bromodichloromethane (1.4 μg/L) above 2L Standards in Well #1.
Naphthalene (0.71 J μg/L), acetone (5.3 J μg/L), chloroform (3.3 μg/L), dibromochloromethane (0.32 μg/L),
and methyl chloride (0.51 μg/L) were detected below 2L Standards in Well #1. Naphthalene was previously
detected in Well #1 and acetone and methyl chloride are probably laboratory artifacts. The presence of
Salemburg Food Mart
October 30, 2023
Page 7 of 7

ATC Project No. STL2971901 NCDEQ State Lead Program
bromodichloromethane, chloroform, and dibromochloromethane can be attributed to by-products of
municipal water disinfection. Methyl chloride (0.65 μg/L) was detected below 2L Standards in Well #2. No
other compounds were detected in water supply wells. Water supply well ownership information is included
in Table 1. Water supply well locations are depicted in Figure 3. Water supply well analytical results are
included in Table 6. The laboratory analytical report is included in Appendix E. The QA/QC measures
outlined in Section 5.2 apply to this section.

6.0 CONCLUSIONS AND RECOMMENDATIONS

On behalf of the Trust Fund Branch of the UST Section, ATC has completed an air sparge-enhanced MMPE
and groundwater monitoring event for the Salemburg Food Mart site located at 801 North Street,
Salemburg, North Carolina. Based on groundwater analytical results from the September 6, 2023 sampling
event, multiple petroleum compounds were identified in the associated monitoring wells exceeding 2L
Standards. No compounds detected exceeded the GCL. Bromodichloromethane was detected above 2L
Standards in Well #1. Naphthalene, acetone, chloroform, dibromochloromethane, and methyl chloride were
detected below 2L Standards in Well #1. Methyl chloride was detected below 2L Standards in Well #2.

Based on the results, it appears groundwater concentrations at the site have generally decreased or
remained stable in wells MW-1R, MW-2R, MW-5, and MW-6. ATC recommends performing a
comprehensive groundwater sampling event within the next six months, to ensure petroleum compounds
remain below the GCL.
Salemburg Food Mart

TABLES

TABLE 1
WATER SUPPLY WELL INFORMATION

SALEMBURG FOOD MART
801 NORTH MAIN STREET
SALEMBURG, NORTH CAROLINA
NCDEQ INCIDENT # 29719
Water Supply Well
ID Property Owner(s)Property Address Distance from Source
(feet)Usage
WSW-1
Thomas Norris
104 Jackson Street
Salemburg, NC 28385
Phone Number Not Available
104 Jackson Street
Salemburg, NC 28385 300 Irrigation
Well #1 602 North Fayetteville Street
Salemburg, NC 28385 400 Municipal Well
Well #2 105 East Pine Street
Salemburg, NC 28385 1,000 Municipal Well
Town of Salemburg
P.O. Box 190
Salemburg, NC 28385
Scott Owen: [phone]
Page 1 of 1
TABLE 2
WELL CONSTRUCTION DETAILS AND GROUNDWATER ELEVATION DATA

SALEMBURG FOOD MART
801 NORTH MAIN STREET
SALEMBURG, NORTH CAROLINA
NCDEQ INCIDENT # 29719
Monitoring
Well
Date
Installed
Well
Diameter
(inches)
Total
Depth
(feet)
Screen
Interval
(feet)
Top of Casing
(feet)Date Measured Depth to
LNAPL (feet)
Depth to
Groundwater
(feet)
LNAPL
Thickness
(feet)
Groundwater
Elevation
(feet)
11/23/2011 --13.66 --81.35
3/9/2012 --13.91 --81.10
4/10/2013 --14.28 --80.73
9/23/2015 --13.65 --81.36
12/16/2015 --7.80 --87.21
9/13/2019
12/4/2019 --12.47 --82.81
3/9/2021 --3.92 --91.36
2/21/2022 --10.83 --84.45
2/25/2022 (Post-MMPE)--11.00 --84.28
3/28/2022 --12.04 --83.24
7/31/2023 (Pre MMPE)--6.22 --89.06
8/4/2023 (Post MMPE)--6.89 --88.39
9/6/2023 --5.41 --89.87
11/23/2011 --13.00 --81.17
3/9/2012 --13.23 --80.94
4/10/2013 --13.66 --80.51
9/23/2015 --13.07 --81.10
12/16/2015 --7.23 --86.94
9/11/2019
12/4/2019 --11.81 --82.55
3/9/2021 --3.32 --91.04
2/21/2022 --10.20 --84.16
2/25/2022 (Post-MMPE)--11.51 --82.85
3/28/2022 --11.38 --82.98
7/31/2023 (Pre MMPE)--5.60 --88.76
8/4/2023 (Post MMPE)--6.38 --87.98
9/6/2023 --4.81 --89.55
3/9/2012 --14.34 --81.11
4/10/2013 --14.93 --80.52
9/23/2015 --14.22 --81.23
12/16/2015 --8.15 --87.30
12/4/2019 --12.40 --83.05
3/9/2021 --3.74 --91.71
3/28/2022 --11.93 --83.52
9/6/2023 --5.16 --90.29
9/23/2015 --13.82 --81.43
12/16/2015 --7.90 --87.35
12/4/2019 --11.96 --83.29
3/9/2021 --3.22 --92.03
3/28/2022 --11.40 --83.85
9/6/2023
9/23/2015 --13.48 --80.90
12/16/2015 --7.74 --86.64
12/4/2019 --12.06 --82.32
3/9/2021 --3.55 --90.83
3/28/2022 --11.61 --82.77
9/6/2023 --5.06 --89.32
12/16/2015 --7.77 --85.87
12/4/2019 --12.06 --81.58
3/9/2021 --3.83 --89.81
3/28/2022 --11.58 --82.06
9/6/2023 --5.23 --88.41
8/18/2011 --13.52 --81.08
2/29/2012 --13.90 --80.70
3/9/2016 --4.33 --90.27
5/8/2017 --6.58 --88.02
12/4/2019 --11.67 --82.93
2/21/2022 --10.04 --84.56
8/18/2011 --12.70 --81.02
2/29/2012 --13.19 --80.53
3/9/2016 --3.70 --90.02
5/8/2017 --5.94 --87.78
12/4/2019 --11.02 --82.70
2/21/2022 --10.53 --NS
2/25/2022 (Post-MMPE)--10.58 --NS
7/31/2023 (Pre MMPE)--6.01 --NS
8/4/2023 (Post MMPE)--6.57 --NS
2/21/2022 --9.96 --NS
2/25/2022 (Post-MMPE)--11.31 --NS
7/31/2023 (Pre MMPE)--5.42 --NS
8/4/2023 (Post MMPE)--6.03 --NS
Notes:
1. -- = Not applicable as LNAPL was not detected.
2. Top of casing is an arbitrary benchmark of 100.00 feet.
3. Corrected Groundwater Elevation = (Groundwater Elevation + (Product Thickness *0.8581)).
4. NS = Not surveyed.
5. LNAPL = Light Non-aqueous Phase Liquid.
Well not located
10 - 15
15 10 - 15
2
93.64
Hills MW-9
MW-1 11/23/2011 2
MW-2R 11/20/2019 2
MW-2
MW-1R 11/20/2019 2
11/23/2011 2
9/21/2015 2
Hills MW-8 8/16/2011 2
MW-6
5 - 15
15 5 - 15
MW-4
4 - 1919212/16/2015
Destroyed
Destroyed
15
15 10 - 15 95.01
95.28
10 - 15 94.17
15
94.36
94.60
AS-1
AS-2
12/21/2021
12/21/2021
2
2
20
20
15 - 20
15 - 20
NS
NS
15 93.728/16/2011
95.45
95.25
MW-5 9/21/2015 2 19 10 - 19 94.38
10 - 1919
MW-3 3/8/2012 2 17 12 - 17
Page 1 of 1
TABLE 3
GROUNDWATER ANALYTICAL DATA

SALEMBURG FOOD MART
801 NORTH MAIN STREET
SALEMBURG, NORTH CAROLINA
NCDEQ INCIDENT # 29719
BenzeneTolueneEthylbenzeneTotal XylenesMTBENaphthaleneAcetoneDi-Isopropyl EtherIsopropylbenzenep-IsopropyltolueneMethyl Chloriden-PropylbenzeneStyrene1,2,3-Trichloropropane1,2,4-Trimethylbenzene1,3,5-TrimethylbenzeneVinyl AcetateVinyl ChlorideMW-1R 9/6/2023 1,030 3,690 1,940 10,200 10.4 J 821 <500 <25 130 <25 <25 395 <25 <25 3,230 847 54.3 10.3
MW-2R 9/6/2023 1,910 6,190 1,450 7,310 279 549 875 22.3 J 99.3 <25 <25 313 <25 <25 2,280 587 <25 <5.0
MW-3 9/6/2023 <0.50 <0.50 0.33 J 0.35 J <0.50 1.4 9.5 J <0.50 0.62 0.91 0.27 J 2.4 <0.50 <0.50 14.7 4.8 <0.50 <0.10
MW-5 9/6/2023 280 1,390 1,390 3,900 <10 372 755 <10 85.3 27.5 37.8 253 7.9 J <10 1,710 421 <10 <2.0
MW-6 9/6/2023 6.2 3.2 J 167 566 <5.0 113 179 <5.0 42.6 2.4 J <5.0 57 <5.0 13.3 594 187 <5.0 <1.0
1 600 600 500 20 6 6,000 70 70 25 3 70 70 0.005 400 400 88 0.03
5,000 260,000 80,000 50,000 20,000 6,000 6,000,000 70,000 30,500 11,700 3,000 26,100 70,000 NE 28,500 24,100 88,000 30
Notes:
"<" = Not Detected at or above the laboratory reporting or detection limit.
Concentrations are reported in micrograms per liter (ug/l) = parts per billion (ppb).
Concentrations in bold print equal or exceed the NCDEQ 15A 2L NCAC Groundwater Standard (2L Standard).
Concentrations bold and italicized equal or exceed the GCLs.
GCL = Gross Contamination Level.
MTBE = Methyl Tertiary Butyl Ether.
J = Analyte detected below reporting limit. Value is an estimate.
Monitoring
Well Date
Method 6200B
2L GW Standard
GCL
Page 1 of 1
TABLE 4
HISTORICAL GROUNDWATER ANALYTICAL DATA

SALEMBURG FOOD MART
801 NORTH MAIN STREET
SALEMBURG, NORTH CAROLINA
NCDEQ INCIDENT # 29719
Monitoring
Well Date
BenzeneTolueneEthylbenzeneTotal XylenesMTBENaphthalenen-ButylbenzeneDi-Isopropyl EtherIsopropylbenzenen-PropylbenzeneMethyl Chloride1,2,3-Trichloropropane1,2,4-Trimethylbenzene1,3,5-Trimethylbenzenep-IsopropyltolueneVinyl ChlorideC5-C8 AliphaticsC9-C18 AliphaticsC9-C22 Aromatics11/23/2011 1,100 3,700 1,700 7,000 230 BDL BDL BDL BDL 510 BDL BDL 2,800 760 BDL BDL NA NA NA
4/10/2013 10,000 16,000 2,900 13,000 1,600 340 170 130 180 670 BDL BDL 3,700 990 BDL BDL NA NA NA
9/23/2015 1,200 3,100 1,400 5,100 250 370 BDL BDL 140 520 BDL BDL 3,000 890 BDL BDL 7,340 10,500 10,000
9/13/2019
12/4/2019 2,000 6,900 2,400 10,100 220 580 66 32 190 570 <50 <25 2,700 990 16 J BDL NA NA NA
3/9/2021 2,500 9,210 2,090 10,900 151 592 <50 <50 113 328 <50 61.6 2,700 699 <50 <10 NA NA NA
3/28/2022 2,120 7,180 1,790 8,860 74.4 684 <25 <25 89.6 280 <25 <25 2,810 710 <25 <5.0 NA NA NA
9/6/2023 1,030 3,690 1,940 10,200 10.4 J 821 <25 <25 130 395 <25 <25 3,230 847 <25 10.3 NA NA NA
11/23/2011 12,000 24,000 2,900 14,000 1,300 1,300 BDL 220 BDL 330 BDL BDL 2,200 550 BDL BDL NA NA NA
4/10/2013 18,000 34,000 4,800 25,000 3,400 680 220 550 190 670 BDL BDL 4,000 1,000 BDL BDL NA NA NA
9/23/2015 13,000 28,000 3,600 19,000 1,700 1,600 BDL BDL BDL BDL BDL BDL 3,200 870 BDL BDL 69,200 35,500 13,000
9/11/2019
12/4/2019 6,700 20,000 3,100 14,300 790 1,800 88 J 130 180 490 <250 <120 2,700 900 <120 BDL NA NA NA
3/9/2021 4,790 8,770 1,970 9,600 1,000 606 <50 110 90.1 286 <50 <50 2,350 583 <50 <10 NA NA NA
3/28/2022 9,950 19,700 2,130 10,800 817 434 29.0 J 152 96.4 J 329 <100 31.6 J 2,790 731 <100 <20 NA NA NA
9/6/2023 1,910 6,190 1,450 7,310 279 549 <25 22.3 J 99.3 313 <25 <25 2,280 587 <25 <5.0 NA NA NA
3/9/2012 BDL BDL 18 16 BDL 7.2 11 BDL 14 39 BDL BDL 100 46 2.2 <1.0 NA NA NA
4/10/2013 BDL 6.4 290 750 BDL 110 66 BDL 97 370 BDL BDL 1,600 520 11 BDL NA NA NA
9/23/2015 BDL BDL 29 110 BDL 42 BDL BDL BDL 40 BDL BDL 320 120 2.8 BDL BDL 450 1,300
12/4/2019 <0.5 <0.5 2.5 0.54 J <0.5 8.5 3.1 <0.5 4.1 14 <1.0 <0.50 10 4.1 1.3 BDL NA NA NA
3/9/2021 <0.50 <0.50 <0.50 <0.50 <0.50 1.2 0.68 <0.50 0.61 3.3 <0.50 <0.50 0.69 <0.50 <0.50 <0.10 NA NA NA
3/28/2022 <0.50 <0.50 2.7 1.0 <0.50 9.0 6.4 <0.50 6.2 29.4 <0.50 <0.50 63.7 19.7 2.6 <0.10 NA NA NA
9/6/2023 <0.50 <0.50 0.33 J 0.35 J <0.50 1.4 <0.50 <0.50 0.62 2.4 0.27 J <0.50 14.7 4.8 0.91 <0.10 NA NA NA
9/23/2015 BDL BDL BDL 0.81 BDL BDL BDL BDL BDL BDL BDL BDL 0.86 BDL BDL BDL BDL BDL 5.1
12/4/2019 <0.5 <0.5 <0.5 <1.5 <0.5 <5.0 <0.5 <0.5 <0.5 <0.5 <1.0 <0.50 <0.5 <0.5 <0.5 BDL NA NA NA
3/9/2021 <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 <0.10 NA NA NA
3/28/2022 <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 <0.10 NA NA NA
9/6/2023
9/23/2015 4,900 12,000 2,900 14,000 1,700 820 BDL BDL 76 550 BDL BDL 1,100 4,200 BDL BDL 17,000 12,200 9,600
12/4/2019 1,400 7,300 2,000 8,200 100 650 31 J <50 120 330 <100 <50 1,700 570 <50 BDL BDL BDL BDL
3/9/2021 317 1,810 1,230 4,010 <25 348 27.7 <25 84.3 289 45.4 39.7 1,800 513 <25 <5.0 NA NA NA
3/28/2022 275 1,370 1,290 4,310 <25 434 18.2 J <25 76.3 282 <25 <25 2,180 561 <25 <5.0 NA NA NA
9/6/2023 280 1,390 1,390 3,900 <10 372 <10 <10 85.3 253 37.8 <10 1,710 421 27.5 <2.0 NA NA NA
12/16/2015 200 15 150 480 38 61 BDL BDL 17 31 BDL BDL 220 56 BDL BDL 709 1,100 800
12/4/2019 50 9.5 140 453.2 6.1 57 5.2 <2.0 29 37 <4.0 <2.0 290 120 1.8 J BDL NA NA NA
3/9/2021 17.5 9.5 389 1,200 <5.0 166 9.4 <5.0 46.1 95.2 <5.0 18.9 895 259 <5.0 <1.0 NA NA NA
3/28/2022 8.0 2.5 80.1 289 <0.50 98.7 7.2 <0.50 35.7 51.1 <0.50 <0.50 299 91.9 <0.50 <0.10 NA NA NA
9/6/2023 6.2 3.2 J 167 566 <5.0 113 <5.0 <5.0 42.6 57 <5.0 13.3 594 187 2.4 J <1.0 NA NA NA
8/19/2011 773 7,520 1,810 8,510 <33 428 NA NA NA NA NR NR NA NA NA BDL NA NA NA
4/10/2013 1,700 8,900 610 5,500 BDL 170 54 BDL BDL 20 BDL BDL 800 390 BDL BDL NA NA NA
9/23/2015 260 3,400 990 4,500 BDL 350 BDL BDL BDL 280 BDL BDL 4,200 500 BDL BDL 6,720 7,910 5,400
12/4/2019 71 2,300 690 3,100 <10 220 12 <10 36 80 <10 <5.0 530 160 <10 BDL NA NA NA
8/19/2011 47.8 24 216 309 <0.65 75.5 NA NA NA NA NR NR NA NA NA BDL NA NA NA
9/23/2015 36 40 270 670 BDL 99 BDL BDL BDL 58 BDL BDL 360 93 BDL BDL 1,555 1,030 1,500
3/9/2016 48.8 1,760 818 2,770 <6.3 238 NA NA NA NA NR NR NA NA NA BDL NA NA NA
5/8/2017 35.7 1,210 1,260 4,140 <6.3 313 NA NA NA NA NR NR NA NA NA BDL NA NA NA
12/4/2019 6.3 120 650 1,630 <5 210 14 <5 55 150 <20 <10 820 290 4.2 J BDL NA NA NA
1 600 600 500 20 6 70 70 70 70 3 0.005 400 400 25 0.03 400 700 200
5,000 260,000 80,000 50,000 20,000 6,000 5,900 70,000 30,500 26,100 3,000 NE 28,500 24,100 11,700 30 NE NE NE
Notes:
"<" or BDL = Not Detected at or above the laboratory reporting or detection limit.
Concentrations are reported in micrograms per liter (ug/l) = parts per billion (ppb).
Concentrations in bold print equal or exceed the NCDEQ 15A 2L NCAC Groundwater Standard (2L Standard), (January 1/21/2021).
Concentrations bold and italicized print equal or exceed the GCLs.
GCL = Gross Contamination Level.
MTBE = Methyl Tertiary Butyl Ether.
ND = Not detected above reporting limit.
NA = Not analyzed.
J = Analyte detected below reporting limit. Value is an estimate.
NR = Not reported.
Destroyed
Destroyed
2L GW Standard
GCL
MW-1
Hills MW-8
Hills MW-9
MW-1R
MW-2
MW-3
MW-4
MW-5
MW-6
MW-2R
Could Not Locate
Page 1 of 1
TABLE 5
FIELD PARAMETERS
SALEMBURG FOOD MART
801 NORTH MAIN STREET
SALEMBURG, NORTH CAROLINA
NCDEQ INCIDENT # 29719
3/9/2021 19.13 3.30 213 6.07 -138.0
3/28/2022
9/6/2023 29.9 0.53 208.3 8.17 -44.6
3/9/2021
3/28/2022
9/6/2023 29.4 0.65 70.6 7.32 -4.2
3/9/2021 18.90 3.15 41 5.43 -99.7
3/28/2022 18.1 1.80 56.7 5.59 65.8
9/6/2023 25.7 3.80 40.2 5.66 45.4
3/9/2021 20.41 5.84 98 5.38 -56.7
3/28/2022 16.7 5.61 55.6 4.66 180.4
9/6/2023
3/9/2021 19.08 3.54 228 6.13 -129.4
3/28/2022
9/6/2023 27.5 0.84 129.3 8.08 -44.7
3/9/2021 20.63 2.37 178 7.43 -146.8
3/28/2022 19.6 1.58 141.6 6.16 70.6
9/6/2023 27.7 0.6 208.8 8.33 -57.6
Notes:
1. mg/L = Milligrams per Liter.
2. °C = Degrees Celcius.
3. μS/cm = MicroSiemens per Centimeter.
4. mV = Millivolts.
5. SU = Standard Units.
MW-3
MW-4
MW-5
MW-6
Petroleum odor - Data not collected
Well not located
Petroleum odor - Data not collectedpH (SU)ORP (mV)Well ID Date
Sampled
Temperature (oC)Dissolved Oxygen (mg/L)Conductivity (μS/cm)MW-1R
MW-2R
Petroleum odor and sheen - Data not collected
Petroleum odor - Data not collected
Page 1 of 1
TABLE 6
WATER SUPPLY WELL ANALYTICAL DATA

SALEMBURG FOOD MART
801 NORTH MAIN STREET
SALEMBURG, NORTH CAROLINA
NCDEQ INCIDENT # 29719
BenzeneTolueneEthylbenzeneXylenesNaphthaleneAcetoneBromodichloromethaneChloroformDibromochloromethaneMethyl Chloride1,2,4-Trimethylbenzene1,3,5-Trimethylbenzene3/9/2021 <0.50 <0.50 <0.50 <0.50 <0.50 <10 <0.50 0.61 <0.20 <0.50 <0.50 <0.50
3/28/2022 <0.50 <0.50 <0.50 0.50 2.1 <10 <0.50 <0.50 <0.20 <0.50 0.61 0.18 J
9/6/2023 <0.50 <0.50 <0.50 <0.50 0.17 J 5.3 J 1.4 3.3 0.32 0.51 <0.50 <0.50
3/9/2021 <0.50 <0.50 <0.50 <0.50 <0.50 <10 <0.50 <0.50 <0.20 <0.20 <0.50 <0.50
3/28/2022 <0.50 <0.50 <0.50 <0.50 <0.50 <10 <0.50 <0.50 <0.20 <0.20 <0.50 <0.50
9/6/2023 <0.50 <0.50 <0.50 <0.50 <0.50 <10 <0.50 <0.50 <0.20 0.65 <0.50 <0.50
1 600 600 500 6 6,000 0.6 70 0.4 3 400 400
5,000 260,000 80,000 50,000 6,000 6,000,000 NE 70,000 400 3,000 28,500 24,100
Notes:
"<" = Not Detected at or above the laboratory reporting or detection limit.
Concentrations are reported in micrograms per liter (ug/l) = parts per billion (ppb).
Concentrations in BOLD print equal or exceed the NCDEQ 15A 2L NCAC Groundwater Standard (2L Standard).
Concentrations italicized equal or exceed the GCLs.
GCL = Gross Contamination Level.
J = Analyte detected below reporting limit. Value is an estimate.
MTBE = Methyl Tertiary Butyl Ether
2L GW Standard
GCL
Monitoring Well Date
Method 6200B
Well #1
Well #2
Page 1 of 1
Salemburg Food Mart

FIGURES

PROPERTY BOUNDARY
WELL #1WELL #2WSW-1SITE
PROPERTY BOUNDARY88.4189.32NL90.2989.8789.5588.75NMNMNMNMNMNMNMNMNMNM89.2589.7590.25
PROPERTY BOUNDARY6.22801,910NL<0.501,0001001011,030
PROPERTY BOUNDARYNL
Salemburg Food Mart

ATC Project No. STL2971901 NCDEQ State Lead Program

APPENDIX A

CONCEPTUAL SITE MODEL

Site Name: Salemburg Food Mart Date:10/30/2023
Property Owner:Ali Tawfig Khanshali Last Field Event Date:9/6/2023
Site Name: Salemburg Food Mart Release Discovery Date:August 2011
NCDEQ UST Incident No.: 29719 Source of Release:Unknown
Facility ID No.: 00-0-000008455 Estimated Volume of Release:Unknown
Risk Classification: 185D
Risk Rank: High Gasoline (leaded)None
Site Address: 801 North Main Street Gasoline (unleaded)Yes
Site City, ST ZIP:Salemburg, 28385 Gasoline (ethanol blend)None
Site County:Sampson Diesel None
NCDEQ Regional Office:Fayetteville Kerosene None
Active UST Facility:No Heating Oil (#2)None
USTs Present:No, removed 2019 Heating Oil (>#2)None
Motor Oil None
Hydraulic Oil None
Major Soil Type:Clayey sand to silt Used Oil None
Surface Cover over impacted soil:Asphalt
Utilities within plume (Y/N/U):Unknown
>S-W MSCCs (Y/N/U):Yes
>Residential MSCCs (Y/N/U):No Site (Current):Commercial
>Comm/Ind MSCCs (Y/N/U):No Site (Future):Commercial
North Adjacent:Vacant
East Adjacent:Salemburg Fire Department and
commercial
Litho-Tectonic Zone Coastal Plain Physiographic Province.South Adjacent:Vacant lot (Former Hills Grocery)
Geologic Formation Black Creek Formation West Adjacent:Vacant
Rock Type
Clay with thin beds and laminae of fine
sands and thick lenses of cross-bedded
sandstones.
Depth to Bedrock (ft bgs)Unknown Municipal Water (Y/N/U):Yes
Active Potable Wells <1000 ft (#/U):1
Active Potable Wells <500 ft (#/U):2
Depth to water (ft-bgs)9.97 Impacted Wells (Y/N/U):Yes, naphthalene below 2L Standard in
Well #1.
Gradient (ft/ft):0.004 Any wells <250 ft (Y/N/U):No
Direction (N E S W combo):Northeast
Hydraulic Conductivity (ft/day):Unknown <500 ft (Y/N):No
Total Porosity (%):Unknown Type of Surface Water:N/A
Effective Porosity (%):Unknown Name of Nearest Stream:Rice Swamp (960 feet)
Flow Rate (ft/year):Unknown Stream Classification:B; SW
COCs >2L (Y/N/U):Yes Impacted Surface Water (Y/N/U):No
COCs >2L Extent Defined (Y/N):No
COCs >GCLs (Y/N/U):Yes
COCs >GCLs (Wells):MW-2R (last exceeded 2022)>LEL in Structures:Unknown
COCs >GCLs Extent Defined (Y/N):Yes Vapors in Buildings:Unknown
COCs >2B Standards by 10X (Y/N/U):NA Slab-on-grade or Crawlspace:Slab-on-grade
LNAPL (Y/N/U):No Dissolved VOCs <5 ft of Structures:Yes
LNAPL (Max Thickness ft):No LNAPL <15 ft of Structures:No
LNAPL (Wells):No Basement <30 ft of Dissolved COCs:N/A
LNAPL Extent Defined (Y/N):N/A
LNAPL (<5 ft beneath buildings/U):N/A
Utilities within plume (Y/N/U):N/A
Alternative Water Source:NA
NORP:Soil and Groundwater
Site Remediation:NA
Soil Excavation:NA
AFVR:NA
MMPE:Yes
SVE/AS:Enhanced AS
Other:
CONCEPTUAL SITE MODEL
Soil Information
Possible Path(s) to Closure
Site Information Release Information
Petroleum Type Released
Geologic Information
Groundwater Information
Comments:
Receptor Information
Water Supply
Vapor
Additional Support Documentation Available / Data Gaps:
Approach (general discussion):Reduce COCs to below GCLs in MW-2R.
Surface Water
Land Use / Zoning
Page 1 of 1
Salemburg Food Mart

ATC Project No. STL2971901 NCDEQ State Lead Program

APPENDIX B

SITE PHOTOGRAPHS

Photo 1: Site status Photo 2: View of MW-1R.
Site Photographs

Salemburg Food mart- Incident #29719

801 North Main Street
Salemburg, Sampson County, North Carolina

2725 E. Millbrook Road, Suite 121
Raleigh, North Carolina
Tel: [phone] Fax: [phone]
Photos Taken By: Justin Jones Site ID: Incident #29719 ATC Project No.: STL02971901

Photo 3: View of MW-2R. Photo 4: View of MW-3.
Site Photographs

Salemburg Food mart- Incident #29719

801 North Main Street
Salemburg, Sampson County, North Carolina

2725 E. Millbrook Road, Suite 121
Raleigh, North Carolina
Tel: [phone] Fax: [phone]
Photos Taken By: Justin Jones Site ID: Incident #29719 ATC Project No.: STL02971901

Photo 5: View of MW-5. Photo 6: View of MW-6.
Site Photographs

Salemburg Food mart- Incident #29719

801 North Main Street
Salemburg, Sampson County, North Carolina

2725 E. Millbrook Road, Suite 121
Raleigh, North Carolina
Tel: [phone] Fax: [phone]
Photos Taken By: Justin Jones Site ID: Incident #29719 ATC Project No.: STL02971901

Photo 7: View of AS-1. Photo 8: View of AS-2.
Site Photographs

Salemburg Food mart- Incident #29719

801 North Main Street
Salemburg, Sampson County, North Carolina

2725 E. Millbrook Road, Suite 121
Raleigh, North Carolina
Tel: [phone] Fax: [phone]
Photos Taken By: Justin Jones Site ID: Incident #29719 ATC Project No.: STL02971901
Salemburg Food Mart

ATC Project No. STL2971901 NCDEQ State Lead Program

APPENDIX C

FIELD NOTES

Salemburg Food Mart

ATC Project No. STL2971901 NCDEQ State Lead Program

APPENDIX D

MMPE REPORT AND WASTE DISPOSAL MANIFESTS

Salemburg Food Mart

ATC Project No. STL2971901 NCDEQ State Lead Program

APPENDIX E

LABORATORY ANALYTICAL RESULTS