WS-28701_48707_CA_AFVR_20221227

2725 E. Millbrook Road, Suite 121
Raleigh, North Carolina 27604
Telephone [phone]
Fax [phone]
www.oneatlas.com

December 27, 2022

Ms. Mindy Lepard
North Carolina Department of Environmental Quality
Winston-Salem Regional Office
Division of Waste Management - Underground Storage Tank Section
450 West Hanes Mill Road, Suite 300
Winston-Salem, North Carolina 27105

Re: AFVR Letter Report
Pilot Travel Centers No. 6955-C
1044 Jimmie Kerr Road
Haw River, Alamance County, North Carolina
NCDEQ Incident Number 48707

Dear Ms. Lepard:

ATC Associates of North Carolina, P.C. (ATC), on behalf of Pilot Travel Centers, LLC, is submitting this letter
report to document the results of the Aggressive Fluid Vapor Recovery (AFVR) event that was conducted at
the facility and pre-approved in task authorization TA-1. The site location is provided in Figure 1 and a site
map is provided as Figure 2.

AFVR Event
On November 15, 2022, ATC supervised the performance of an AFVR event at the site to assist in light
non-aqueous phase liquid (LNAPL) recovery. Prior to the initiation of AFVR activities, depths to LNAPL
and groundwater were measured in monitoring wells MW-3 and MW-4. LNAPL was measured in
monitoring well MW-3 at a thickness of 11.07 feet. LNAPL was not measured in well MW-4 on this date.
The AFVR event included a single connection to well MW-3 for a 495-minute period.

A stinger pipe consisting of 1-inch flexible hose was used to connect between the truck vacuum line and
monitoring well MW-3. The stinger pipe in well MW-3 was lowered to an approximate depth of 20.5 feet
below ground surface (bgs). The stinger pipe was not adjusted during the event. The annuli between the
stinger pipe assembly and the well casing was sealed in an effort to minimize vacuum loss. AFVR activities
were initiated at 0645 hours with a single connection to monitoring well MW-3. At 1445 hours, the AFVR
event concluded.

Throughout the AFVR event, operative parameters from the exhaust stack on the vacuum truck were
measured at 15-minute intervals for the first 2 hours and at 30-minute intervals for the remaining 6 hours.
Using a photoionization detector (PID), total volatile organic compound (VOC) readings from the exhaust
stack ranged from 181.6 parts per million (ppm) to 488.5 ppm during the event. The truck vacuum gauge
reading registered between 19 and 21 inches of mercury throughout the event.

During the AFVR event, a total of 345 gallons of LNAPL and petroleum-impacted groundwater was
recovered. Approximately 4.3 gallons of LNAPL was noted in the vacuum truck tank. A copy of the
vacuum truck specification is included in Attachment I. Eastern Environmental Management, LLC of
Rocky Mount, North Carolina disposed of the recovered fluid. The disposal manifest is included in
Attachment I.
AFVR Letter Report
C Mini Mart #6 (Breeze Thru #30122)
ATC Associates of North Carolina, LLC
December 27,2022
Using the PID readings of the exhaust stack, air emission calculations indicated approximately 6.50 pounds
(0.98780 gallons) of petroleum vapors were emitted through the exhaust stack. AFVR field measurements
and emissions calculations are provide d in Table t .
On December 19,2022, ATC measured monitoring well MW-3 for the presence of LNAPL. On this date,LNAPL was not measured in monitoring well MW-3.
ATC recommends conducting quarter LNAPL checks on monitoring well MW-3.
Ifyou haye any questions, please contact me at (9 I 9) 56 I -3893.
Sincerely,
ATC Associates ofiI,
Samuel Wakefield
Program Manager
Mr. Joey Cupp, Pi
Maureen Jackson, P.Gi
Senior Project
dililt

TABLE
TABLE 1
AFVR DATA AND EMISSIONS CALCULATIONS (11/15/2022 EVENT)
PILOT TRAVEL CENTERS NO. 6955-C
1044 JIMMIE KERR ROAD
HAW RIVER, ALAMANCE COUNTY, NORTH CAROLINA
NCDEQ INCIDENT NO. 48707
AGGRESSIVE FLUID VAPOR RECOVERY EVENT
SITE NAME: Pilot Travel Centers No. 6955-C
INCIDENT NUMBER: 48707
AVERAGE DEPTH TO GROUNDWATER: Approximately 15 feet
IDENTIFY THE WELL AND THE I.D. OF EACH WELL USED FOR AFVR: MW-3
PROVIDE BLOWER SPECIFICATIONS OF THE VACUUM TRUCK (cfm @ in Hg): 434cfm @ 24in Hg
DRY STANDARD CUBIC FEET PER MINUTE (DSCFM) AIR FLOW CALCULATIONS (Qstd)
Date Time Vacuum Velocity Pipe ID Temp Rel Humid Water Qstd PPM T (K)Ps (Pa)Pv (Pa)
(inches of Hg)(ft/min)(in)(°F)(%)Vapor (%)(flow)(measured)
11/15/2022 6:45
11/15/2022 6:45 -20 39 6 57.7 89.7 9.00E-05 8 421.9 287.28 1610.8 1.44E+03
11/15/2022 7:00 -20 142 6 62.3 89.9 1.07E-04 28 441.4 289.83 1897.7 1.71E+03
11/15/2022 7:15 -20 125 6 71.5 100.0 1.64E-04 24 455.5 294.94 2608.8 2.61E+03
11/15/2022 7:30 -19 202 6 87.2 100.0 2.80E-04 37 399.0 303.67 4367.1 4.37E+03
11/15/2022 7:45 -20 120 6 95.3 100.0 3.65E-04 22 406.2 308.17 5624.0 5.62E+03
11/15/2022 8:00 -20 153 6 100.9 100.0 4.38E-04 27 356.2 311.28 6666.3 6.67E+03
11/15/2022 8:15 -19 166 6 101.3 100.0 4.44E-04 29 404.1 311.50 6746.8 6.75E+03
11/15/2022 8:30 -20 200 6 105.1 100.0 5.01E-04 35 409.5 313.61 7554.0 7.55E+03
11/15/2022 8:45 -20 237 6 100.8 100.0 4.37E-04 42 384.1 311.22 6646.4 6.65E+03
11/15/2022 9:00 -20 283 6 92.8 100.0 3.37E-04 51 399.9 306.78 5206.3 5.21E+03
11/15/2022 9:30 -19 326 6 101.6 100.0 4.48E-04 57 227.8 311.67 6807.7 6.81E+03
11/15/2022 10:00 -18 365 6 103.6 100.0 4.78E-04 64 181.6 312.78 7226.0 7.23E+03
11/15/2022 10:30 -18 293 6 113.2 100.0 6.48E-04 50 201.4 318.11 9557.3 9.56E+03
11/15/2022 11:00 -20 267 6 118.7 100.0 7.70E-04 44 202.6 321.17 11164.6 1.12E+04
11/15/2022 11:30 -20 298 6 101.9 100.0 4.52E-04 52 209.5 311.83 6869.1 6.87E+03
11/15/2022 12:00 -20 290 6 113.2 100.0 6.48E-04 49 201.3 318.11 9557.3 9.56E+03
11/15/2022 12:30 -21 50 6 131.1 100.0 1.14E-03 8 431.2 328.06 15660.5 1.57E+04
11/15/2022 13:00 -21 67 6 123.9 100.0 9.07E-04 11 416.5 324.06 12892.6 1.29E+04
11/15/2022 13:30 -20 61 6 135.5 97.6 1.27E-03 9 423.2 330.50 17590.5 1.72E+04
11/15/2022 14:00 -20 43 6 136.4 100.0 1.34E-03 6 467.6 331.00 18009.3 1.80E+04
11/15/2022 14:30 -20 83 6 127.5 87.3 8.68E-04 13 488.5 326.06 14219.0 1.24E+04
11/15/2022 15:00 -20 42 6 115.3 100.0 6.92E-04 7 478.3 319.28 10145.7 1.01E+04
NOTES
Qstd = Flow at DSCFM
Vacuum = The level of vacuum being applied should be recorded from the vacuum truck tank (inches of Hg)
Velocity = The rate at which air flows is measured at the blower discharge piping (anemometer or pitot tube)
Pipe ID = The inside diameter of the blower discharge piping (from the vacuum truck)
Temperature = The temperature of the air stream exiting the blower discharge piping (dry bulb temp., in deg.°F)
Relative humidity = The % relative humidity of the air stream exiting the blower discharge piping
Water Vapor in % = Pounds of water per pound of dry air, derived from the Psychrometric chart (temp Vs relative humidity)
EQUATION
Qstd = (1-Water Vapor) * velocity * (PI * (diameter/24)^2) * (528°R/(Temp + 460))
Set up on well MW-3. Stinger set at approximatley 20.5 feet bgs.
TABLE 1
AFVR DATA AND EMISSIONS CALCULATIONS (11/15/2022 EVENT)
PILOT TRAVEL CENTERS NO. 6955-C
1044 JIMMIE KERR ROAD
HAW RIVER, ALAMANCE COUNTY, NORTH CAROLINA
NCDEQ INCIDENT NO. 48707
EMISSION CALCULATIONS
Elapsed
Time Flow PPM measured K PPMg Cg:m Cg PMRg PMR
(min)(DSCFM)(ppm)(#C - gas)(mg/dsm^3)(lb/dscf)(lb/hr)(lb)
0 8 421.9 4 1687.6 8974 0.000560269 0.26 0.33
15 28 441.4 4 1765.6 9689 0.000604889 0.87 0.22
30 24 455.5 4 1822 8487 0.000529859 1.18 0.30
45 37 399.0 4 1596 8640 0.00053942 0.70 0.17
60 22 406.2 4 1624.8 7577 0.000473022 0.61 0.15
75 27 356.2 4 1424.8 7577 0.000473022 0.77 0.19
90 29 404.1 4 1616.4 8596 0.000536631 0.94 0.24
105 35 409.5 4 1638 8711 0.000543802 1.14 0.28
120 42 384.1 4 1536.4 8170 0.000510072 1.28 0.32
135 51 399.9 4 1599.6 8506 0.000531054 1.63 0.82
165 57 227.8 4 911.2 4846 0.000302511 1.04 0.52
195 64 181.6 4 726.4 3863 0.000241159 0.93 0.46
225 50 201.4 4 805.6 4284 0.000267453 0.80 0.40
255 44 202.6 4 810.4 4310 0.000269046 0.71 0.36
285 52 209.5 4 838 4456 0.000278209 0.88 0.44
315 49 201.3 4 805.2 4282 0.00026732 0.79 0.39
345 8 431.2 4 1724.8 9172 0.000572619 0.27 0.13
375 11 416.5 4 1666 8859 0.000553098 0.36 0.18
405 9 423.2 4 1692.8 9002 0.000561996 0.31 0.16
435 6 467.6 4 1870.4 9946 0.000620957 0.24 0.12
465 13 488.5 4 1954 10391 0.000648712 0.52 0.26
495 7 478.3 4 1913.2 10174 0.000635167 0.27 0.07
510
Total emissions in pounds 6.50
NOTES
PPM measured = Actual measurements (ppm) taken with a OVA or TVA at the blower discharge piping
K = Number of carbons in calibration gas: (Methane K = 1, Propane K = 3, Isobutylene = 4, or Hexane K = 6)
PPMg = PPMv, Volumetric concentration as gasoline emission, dry basis at STP
Cg:m = mg/dsm3, mass concentration of gasoline emission
Mg = 128 mg/mg-mole, molecular weight of gasoline (this value may vary depending on contaminant)
K3 = 24.07 dsm^3/1E6 mg-mole, mass to volume conversion factor at STP
Cg = lb/dcsf, mass concentration of gasoline emission, dry basis at STP
PMRg = lb/hr, pollutant mass removal rate of gasoline emission
PMR = pollutant mass removal of gasoline emission over time
Recovery:
345 Gallons total fluids
4.3 Gallons free product as a liquid
0.98780 Gallons of diesel as vapor (assuming a specific density of 0.88 as a liquid)

FIGURES

ATTACHMENT I