AS-2806_28107_CA_FPR_20221123

REPORT
ENMARK 815
2580 HENDERSONVILLE ROAD
ARDEN, BUNCOMBE COUNTY,
NORTH CAROLINA
NCDEQ ID #0-007365; INCIDENT #28107
Prepared For:
Enmark Stations Inc.
P.O. Box 728
Savannah, Georgia 31402
November 23, 2022

November 23, 2022 Ms. Maura Clark NCDEQ Division of Waste Management Asheville Regional Office 2090 U.S. Highway 70
Swannanoa, North Carolina 28778
Subject: Free Product Recovery Report Enmark 815 2580 Hendersonville Road Arden, Buncombe County, North Carolina NCDEQ Facility I.D. #0-007365; Incident No. 28107 BLE Project No. J22-7154-16 Dear Ms. Clark: On behalf of Enmark Stations Inc. (Enmark), Bunnell-Lammons Engineering, Inc. (BLE) has completed two 10-hour AFVR events at the subject site. This scope of work was performed in general accordance with North Carolina Department of Environmental Quality (NCDEQ) pre-approve task authorization dated August 1, 2022. This report describes the project background and presents the scope of the free product recovery and BLE’s conclusions and recommendations.
BLE appreciates the opportunity to provide our professional services on this project. If you have any questions regarding this report, please feel free to contact us at [phone].
Sincerely, BUNNELL-LAMMONS ENGINEERING INC.
Brendan Wright Daniel P. Osbourne, P.G. Staff Hydrogeologist Chief Scientist Registered, North Carolina #2071 cc: Ms. Chelsea Jenkins, P.G., Enmark Stations Inc.
Free Product Recovery Report November 23, 2022
Enmark 815; NCDEQ ID #0-007365; Incident #28107 BLE Project No. J22-7154-16
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TABLE OF CONTENTS

1.0 BACKGROUND INFORMATION ............................................................................................. 1
2.0 SITE INFORMATION .................................................................................................................. 2 2.1 Site Information ............................................................................................................................... 2 2.2 Site Contacts .................................................................................................................................... 2 2.3 Information About Release .............................................................................................................. 3
3.0 SITE HISTORY AND CHARACTERISTICS ............................................................................ 4 3.1 Previous UST Owner and Operator Information ............................................................................. 4 3.2 UST Information .............................................................................................................................. 4
3.3 Historical Releases ........................................................................................................................... 4 3.4 Site Characteristics........................................................................................................................... 4
4.0 AFVR EVENTS ............................................................................................................................. 5
5.0 CONCLUSIONS AND RECOMMENDATIONS ....................................................................... 6 Tables Table 1 – AFVR Event Data – September 19, 2022 Table 2 – AFVR Event Data – September 20, 2022 Figure Figure 1 – Site Location Map Appendices Appendix A Disposal Manifest
Free Product Recovery Report November 23, 2022
Enmark 815; NCDEQ ID #0-007365; Incident #28107 BLE Project No. J22-7154-16
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1.0 BACKGROUND INFORMATION
The Enmark 815 facility is located at 2580 Hendersonville Road in Arden, Buncombe County, North Carolina (Figure 1) and comprises approximately 1.70 acres of land. The property is bordered by residential property to the south and east, and commercial properties to the north and west. Historically, five gasoline dispensers (dispensers 1/2, 3/4, 5/6, 7/8, and 9/10) and two auto-diesel dispensers (dispenser 11 and 12) were situated beneath a canopy located to the west of the convenience store and three
diesel dispensers (dispenser 13/14, 13s, and 14s) and one kerosene dispenser (dispenser 15) were situated beneath a second, smaller canopy located to the south of the convenience store. The dispensers were connected to six underground storage tanks (USTs) (three 12,000-gallon, two 6,000-gallon, and one 3,000-
gallon) located in a shared tank pit on the southeast corner of the subject property. From September 20, 2010 through October 8, 2010 the dispensers, USTs, and associated product piping
were removed from the site in preparation for site demolition and rebuilding of the station. Existing groundwater monitoring wells associated with the site were properly abandoned prior to soil excavation and demolition activities. The UST closure activities and soil excavation were conducted in accordance with the North Carolina Department of Environmental Quality (NCDEQ) Underground Storage Tank Section Guidelines for Site Checks, Tank Closure, and Initial Response and Abatement for UST Releases dated December 1, 2008 (NCDEQ Guidelines) and details of the UST closure can be found in the Report of UST Closure and Soil Excavation by BLE dated January 3, 2011. Multiple environmental assessments have been performed at the site since that time. Pursuant to NCDEQ’s Task Authorization (TA #28107-17), two 10-hour Aggressive Fluid Vapor Recovery (AFVR) events were completed at the subject site. A summary of these events are provided herein.

Free Product Recovery Report November 23, 2022
Enmark 815; NCDEQ ID #0-007365; Incident #28107 BLE Project No. J22-7154-16
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2.0 SITE INFORMATION
2.1 Site Information
Date of Report November 23, 2022 Facility Identification No. 0-007365 Incident Number 28107
Site Risk/Priority Rank H150R
Site Name Enmark 815 Site Address 2580 Hendersonville Road
Arden, Buncombe County, North Carolina Location Method NCDEQ UST Registry Data Point Location Latitude: N35o27’05.58” Longitude: W82o30’33.52”
2.2 Site Contacts
UST Owner Enmark Stations, Inc. P.O. Box 728 Savannah, Georgia 31402 [phone] UST Operator Enmark Stations, Inc. P.O. Box 728
Savannah, Georgia 31402 [phone]
Property Owner Enmark Stations, Inc. P.O. Box 728 Savannah, Georgia 31402
[phone] Property Occupant Enmark Stations, Inc. P.O. Box 728 Savannah, Georgia 31402 [phone] Consultant/Contractor Bunnell-Lammons Engineering, Inc. 6004 Ponders Court Greenville, South Carolina 29615 [phone]

Free Product Recovery Report November 23, 2022
Enmark 815; NCDEQ ID #0-007365; Incident #28107 BLE Project No. J22-7154-16
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2.3 Information About Release
Date Discovered March 26, 2003 Estimated Quantity of Release Unknown
Cause of Release Line Leak Source of Release Line Leak at diesel UST
UST Size and Contents 8,000-gallon diesel
I, Daniel P. Osbourne, a Professional Geologist for Bunnell-Lammons Engineering, do certify that the information contained in this report is correct and accurate to the best of my knowledge. Bunnell Lammons Engineering is licensed to practice geology in North Carolina. The certification number of the company is C-284. _______________________________ Daniel P. Osbourne, P.G. Chief Scientist Registered, North Carolina No. 2071

Free Product Recovery Report November 23, 2022
Enmark 815; NCDEQ ID #0-007365; Incident #28107 BLE Project No. J22-7154-16
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3.0 SITE HISTORY AND CHARACTERISTICS
3.1 Previous UST Owner and Operator Information
The property, business, and associated USTs have been owned and operated by Enmark Stations, Inc. since approximately 1985. The previous owners or occupants are unknown.
3.2 UST Information
UST Number Product Date Installed Date Closed
D1 Diesel 6,000 5/1985 9/2010 Yes
D2 Gasoline 6,000 5/1985 9/2010 No
K1 Kerosene 3,000 5/1985 9/2010 No
NL1 Gasoline 12,000 5/1985 9/2010 No
P1 Gasoline 12,000 5/1985 9/2010 No
R1 Gasoline 12,000 5/1985 9/2010 No
1 Other, Petroleum 20,000 10/2010 In Use No
2A Other, Petroleum 12,000 10/2010 In Use No
2B Diesel 8,000 10/2010 In Use No
3 Kerosene 6,000 10/2010 In Use No

3.3 Historical Releases
Only one historical petroleum release (Incident #28107) has been reported at the subject site. The following site information was obtained from a review of the NCDEQ UST database and conversations with knowledgeable persons. On March 24, 2003, a diesel product line at the subject site failed a simplicity line test, and also failed a precision line test conducted on the following day. On March 26, 2003, Precision Tank Services, Inc. performed a helium test and located a leak at the diesel tank. Petroleum impacted soil was excavated from the source area and the release was reported to the NCDEQ.
3.4 Site Characteristics
The property comprises approximately 1.70 acres of land and is bordered by residential property to the south and east and commercial properties to the north and west. The subject site is relatively flat and almost
entirely covered with asphalt and pavement except for perimeter planter areas to the north and east. Two retention ponds are located on the southern portion of the property.
Free Product Recovery Report November 23, 2022
Enmark 815; NCDEQ ID #0-007365; Incident #28107 BLE Project No. J22-7154-16
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4.0 AFVR EVENTS
Two 10-hour AFVR events were conducted on September 19, 2022, and September 20, 2022. The September 19th event was performed on recovery well RW-1 and the September 20th event was performed on monitoring well MW-33. Prior to initiating the events, BLE personnel gauged the monitoring well using a Solinst® Interface Meter Model 122. There was approximately 1.16-feet of free-phase petroleum product detected in RW-01 and there was no measurable free-phase petroleum in MW-33.
The AFVR events were initiated at 07:00 on September 19th and 08:00 on September 20th. The general weather conditions observed on September 19th were partly cloudy skies and an ambient air temperature ranging between 54º and 80º Fahrenheit. The general weather conditions observed on September 20th were
clear skies and ambient air temperatures ranging between 60º and 84º Fahrenheit. At the completion of the two AFVR events, a total approximately of 1,000 gallons of petroleum-impacted
groundwater was determined to have been recovered from the site. Tables summarizing field measurements and emissions calculations for both AFVR events are provided as Table 1 and Table 2. Waste transportation and disposal records are provided in Appendix A.
Free Product Recovery Report November 23, 2022
Enmark 815; NCDEQ ID #0-007365; Incident #28107 BLE Project No. J22-7154-16
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5.0 CONCLUSIONS AND RECOMMENDATIONS
During the current scope of work, two 10-hour AFVR events were performed at the site to remove residual free-phase product and dissolved-phase petroleum contaminants from the areas immediately surrounding recovery well RW-01 and monitoring well MW-33. At the completion of the AFVR events, a total volume of 1,000-gallons of petroleum-impacted groundwater was recovered from the site. Of the recovered volume, approximately 1.8-gallons of gasoline were
calculated to have been recovered via vapor-phase emissions. Additional petroleum product was likely emulsified in the groundwater and/or volatilized during the AFVR event. Therefore, these petroleum liquids could not be quantified.
BLE recommends performing a comprehensive groundwater sampling event at the site to evaluate the effectiveness of the AFVR events, obtain current contaminant concentration data, and to evaluate
contaminant trends.

TABLES

AFVR Well
(in. of Hg)
AFVR Well
(feet btoc)(in. of Hg)
Date Time
(hh:mm)
Elapsed Time
(hours)RW-01 RW-01 MW-20
9/20/2022 08:00 0.0
9/20/2022 08:30 0.59/20/2022 09:00 1.0
9/20/2022 09:30 1.5
9/20/2022 10:00 2.0
9/20/2022 10:30 2.5
9/20/2022 11:00 3.0
9/20/2022 11:30 3.5
9/20/2022 12:00 4.0
9/20/2022 12:30 4.59/20/2022 13:00 5.0
9/20/2022 13:30 5.5
9/20/2022 14:00 6.0
9/20/2022 14:30 6.5
9/20/2022 15:00 7.0
9/20/2022 15:30 7.5
9/20/2022 16:00 8.0
9/20/2022 17:00 9.0
Initial Depth to
(ft btoc)
Initial Depth
(ft btoc)
Initial FPP
(ft)(ft btoc)(ft btoc)
Final FPP Thickness (ft)
Water Level
(ft)Notes:3-inch diameter stack size
38.12 39.28 1.16 NFPP 40.53 NFPP 1.25 btoc - below top of casing
Temperature and Relative Humidity measured with an Extech 45160
450 Thermo-Hygro-Anemometer.0.00 in. of Hg - inches of mercury
7.2 ppm - parts per million
8.4 Water Level Change (feet) = Final depth to water - initial depth to water
CFM - Cubic feet per minute
FPP - Free-Phase Product
NCDEQ ID#0-007365; Incident #28107Arden, Buncombe County, NC
Enmark 815September 19, 2022 AFVR Event Data
AFVR Field Measurements
Relative
(%)(ft/min)(CFM)(ppm)
Air Emissions
(ppm)(oF)
Vacuum at
(in. Hg)
Total Calculated Carbon Recovered as Emissions (pounds)
Total Calculated Gasoline Recovered as Emissions (pounds)Total Calculated Gasoline Recovered as Emissions (gallons)
MW-20
Total Volume of Water (gallons)
Monitoring Well Gauging Data
Total Volume of FPP (gallons)
Monitoring Well Number
RW-01
Prepared By: DRMChecked By: RAD
AFVR Well
(in. of Hg)
AFVR Well
(feet btoc)(in. of Hg)
Date Time (hh:mm)Elapsed Time (hours)MW-33 MW-33 MW-17
9/19/2022 07:00 0.0
9/19/2022 07:30 0.5
9/19/2022 08:00 1.0
9/19/2022 08:30 1.5
9/19/2022 09:00 2.0
9/19/2022 09:30 2.5
9/19/2022 10:00 3.0
9/19/2022 10:30 3.5
9/19/2022 11:00 4.0
9/19/2022 11:30 4.5
9/19/2022 12:00 5.0
9/19/2022 12:30 5.5
9/19/2022 13:00 6.0
9/19/2022 13:30 6.5
9/19/2022 14:00 7.0
9/19/2022 14:30 7.5
9/19/2022 15:00 8.0
9/19/2022 16:00 9.0
Initial Depth to
(ft btoc)
Initial Depth
(ft btoc)
Initial FPP
(ft)(ft btoc)(ft btoc)
Final FPP
Thickness (ft)
Water Level
(ft)Notes:3-inch diameter stack size
NFPP 32.86 NFPP NFPP 37.13 NFPP 4.27 btoc - below top of casing
PID - Photo-Ionization Detector
550 in. of Hg - inches of mercury
0.00 ppm - parts per million
4.0 Water Level Change (feet) = Final depth to water - initial depth to water
4.6 NFPP - No Free Phase Product
CFM - Cubic feet per minute
TABLE 2
AFVR Event Data
September 20, 2022Enmark 815
Arden, Buncombe County, NC
Air Emissions
Total Calculated Carbon Recovered as Emissions (pounds)
Total Calculated Gasoline Recovered as Emissions (pounds)Total Calculated Gasoline Recovered as Emissions (gallons)
Total Volume of Water (gallons)
MW-17
Vacuum at
(in. Hg)(oF)
Total Volume of FPP (gallons)
Monitoring Well Number
MW-33
(ppm)
Relative
(%)(ft/min)(CFM)(ppm)
Monitoring Well Gauging Data AFVR Field Measurements
Prepared By: DRM

FIGURE

@A
@A@A
@A
RW-1
MW-33
MW-20
MW-17
FIGURE NO.
1
REFERENCE:2019 AERIAL PHOTOGRAPH FROM NCONEMAP.GOV
SITE LOCATION MAP
!
0 50 100
(IN FEET)
LEGEND
Site
@A Wells
1 " = 50 'SCALE:
DATE:11-18-22PROJECT NO.: 7154-15 PREPARED : KLC REVIEW: DPOAPPROVED: DPO
@A@A
MW-33MW-17
@A@A
RW-1MW-20
0 10 205Feet
0 10 205Feet

APPENDIX A
Disposal Manifest