AS-3797_28920_CA_MMPE_20230814

WithersRavenel

Our People. Your Success.

115 MacKenan Drive | Cary, NC 27511
t: 919.469.3340 | f: 919.467.6008 | www.withersravenel.com | License No. F-1479
ASHEVILLE | CARY | CHARLOTTE | GREENSBORO | LUMBERTON | PITTSBORO | RALEIGH | SOUTHERN PINES | WILMINGTON

August 14, 2023
State of North Carolina Department of Environmental Quality Federal & State Lead Program
Division of Waste Management-Underground Storage Tank Section
1646 Mail Service Center Raleigh, North Carolina 27699-1646 Attn: Ms. Sharon Ghiold

RE: LETTER REPORT – MOBILE MULTI-PHASE EXTRACTION EVENT Good Ole Boys 2503 Highway 226 North Bostic, Rutherford County, North Carolina
Groundwater Incident Number: 28920
UST Number: AS-3797 WR Project Number: 23-0307-CF Ms. Ghiold:
WithersRavenel, Inc. (WR) has completed this Letter Report to document the Air Sparge Enhanced Mobile Multi-Phase Extraction (AS/MMPE) event described in task authorization (TA) TA-01 for the above referenced site approved June 15, 2023 under North Carolina Department of Environmental Quality (NCDEQ) Contract #N70522-C. WR mobilized to the subject site on
June 19, 2023, for the purpose of performing an AS/MMPE event on select monitoring wells and
utilizing air sparge wells AS-1 and AS-2 for air injection. The site location is depicted on Figure 1 and site features including monitoring well locations are depicted on Figure 2. Sparge-Enhanced MMPE Event
WR personnel, along with Advanced Environmental Services, Inc. (Advanced) mobilized to the
site on June 19, 2023 for the purposes of performing a 96-hour AS/MMPE event. This event was initiated to reduce the compounds exceeding the Gross Contamination Levels (GCLs) within monitoring wells MW-1 and MW-4. Advanced utilized vacuum extraction equipment mounted within an enclosed trailer as well as a 6,000-gallon (gal) tanker trailer.

For the AS/MMPE event, Advanced connected to air sparge wells AS-1 and AS-2 and utilized an air compressor to deliver air into each air sparge well. Advanced installed a 1-in diameter PVC stingers into well MW-1 and MW-4 at a depth approximately 1-ft beneath the measured groundwater elevation on June 19, 2023. These stingers were plumbed at the surface to a 2.0-in
diameter chemical resistant flexible hose, which was connected to a vacuum truck servicing the
vacuum/pressure regenerative blower housed in the equipment trailer. Recovered fluids were stored within a 6,000-gallon tanker trailer. For induction of air for the purposes of sparging, ½-in diameter PVC tubing was placed within AS-1 and AS-2 at depths beneath the measured
WithersRavenel

Our People. Your Success.
Good Ole Boys – NCDEQ Inc. #28920 WR Project No. 23-0307-CF
Letter Report – MMPE Event August 2023
Page 2
groundwater elevation. This tubing was plumbed to a compressor which injected air into air
sparge wells AS-1 and AS-2. Following the setup, the AS/MMPE system was started and operated continuously for a period of 96-hours to induce movement and recovery of total fluids from MW-1 and MW-4. Advanced
personnel monitored the performance of the AS/MMPE system over the course of the event,
adjusting the stinger depths and optimizing recovery as necessary.
On arrival, WR personnel opened and gauged monitoring wells MW-1 and MW-4 with a decontaminated product/water interface probe. Gauging of LNAPL within these wells showed the following:

Well ID Depth to LNAPL/Product Depth to Water Well Depth LNAPL Thickness
MW-1 --- 23.34 35.00 ---
MW-4 --- 24.10 35.00 ---
[All measurements shown in feet (ft)]

Throughout the course of the AS/MMPE event, effluent emissions ranged from 7,000 parts per million (ppm) to 11,000 ppm. In completion of the AS/MMPE event, a total of 3,630-gallons of fluids were recovered from MW-1 and MW-4 and based on mass removal calculations, a total of 340.08 pounds or 55.28 gallons of volatile organic compounds (VOCs) were removed as vapor.
The manifest and disposal document associated with disposal are included as attachments.
After completion of the AS/MMPE event, Advanced dismantled the MMPE setup at the location. WR personnel gauged the wells with the interface probe after removal of the stingers and did not detect measurable LNAPL following the MMPE event.

Field notes and site photos for the June 2023 AS/MMPE event are included in Appendix A. The manifest, disposal documents, and the AS/MMPE report associated with the event are included in Appendix B.
WR appreciates the opportunity to be of service to the Federal & State Lead Program. Should
you have any questions regarding the attached, please contact us at [phone]. Cordially, WithersRavenel

Flora D’Souza, CHMM Elizabeth A. Allyn, P.G.
Environmental Project Scientist II Environmental Project Geologist II

Enclosure(s):
APPENDIX A
FIELD NOTES & SITE PHOTOGRAPHS
PHOTOGRAPH 1 View of site with AS/MMPE equipment
PHOTOGRAPH 2 View of MW-1 and AS-1
PHOTOGRAPH 3 View of MW-4 and AS-2
PHOTOGRAPH 4 View of liquids being pumped from MMPE tank for disposal

APPENDIX B

DISPOSAL MANIFEST AND MMPE CALCULATIONS

ADVANCED
ENVIRONMENTAL SERVICES, INC.
“Your Environmental Solutions Partner”

MOBILE
MULTI-PHASE
EXTRACTION REPORT

Site Location:

Good Ole Boys
2503 Hwy 226
Bostic, NC

Prepared for:

WithersRavenel
6201 Fairview Rd., Suite 200
Charlotte, NC 28201
PM – Ms. Flora D’Souza, CHMM

July 17, 2023

TABLE OF CONTENTS

EVENT SUMMARY

MMPE FIELD LOG

MASS-REMOVAL CALCULATION

FIELD NOTES

DISPOSAL MANIFESTS

MOBILE MULTI-PHASE EXTRACTION
EVENT SUMMARY

July 17, 2023

Location: Good Ole Boys
2503 Hwy 226
Bostic, NC

Client: WithersRavenel
6201 Fairvew Rd., Suite 200
Charlotte, NC 28201

Event Dates: June 19 - 23, 2023
Advanced Job # 06 - 2337

Advanced Personnel: Scott Crook and Gary McDaniel

MMPE System: MMPE system rated 280 CFM at 25.0” hg
4’ discharge stack - 6” diameter
6,000 - gallon tanker
100 feet of 1.5” hose to 2 wells

Extraction Well: MW-1 and MW-4
Air Sparge: AS-1 and AS-2

Well Initial FP / WL(ft) Final FP / WL(ft) Stinger depth(ft) Run Time
/ Changed To
MW-1 23.34 28.63 24/26/28 96.0 hours
MW-4 24.10 28.68 24/26/28 96.0 hours

Description of Event:
The MMPE event ran from 13:30 June 19, 2023 through 13:30 June 23, 2023. The MMPE
system was active for 96.0 hours. During the event vacuum at the recovery pump ranged from
20.0 to 21.0 inches of mercury (hg) and stabilized at approximately 20.0 inches of mercury.
Airflow rates ranged from 1,150 to 1,200 feet per minute and stabilized at approximately 1,200
feet per minute. System temperature ranged from 116.0 – 134.0 degrees F and humidity ranged
from 46.0 to 64.0 percent. Field gauged volatile organic compounds (VOC’s) emissions reduced
from 11,000 parts per-million (PPM) to 7,000 PPM throughout the event.

Groundwater / Product Mix Recovered:
During the event a total of 3,630 gallons of product/water mix were removed from the site and
properly disposed at a certified North Carolina disposal facility. No measurable free product
was recovered as liquid. Total fluids recovered, was measured based on stick readings
conducted during and following the event. Based on 96.0 hours of operation and a total of 3,630
gallons recovered, the average groundwater recovery rate was calculated to be approximately
37.81 gallons per hour.

Events Results:
Based on mass-removal calculations 340.08 pounds or 55.28 gallons of VOC’s were removed as
vapor. Following the event, no free product was identified in any well.

MMPE FIELD LOG:
CLIENT: WithersRavenel
JOB NAME: Good Ole Boys
LOCATION: Bostic, NC
MMPE EVENT DATES: June 19 - 6/23, 2023
EXTRACTION POINTS: MW-1 and MW-4
AES JOB NUMBER: 06 - 2337

DATE TIME FLOW (f/m) HUM.(%) TEMP. (F) VOC's(ppm) VAC. (hg") GALLONS STINGER/WL's EXTRACTION POINTS (hg")
MW-1 MW-4
Stinger(ft)24,28 24,28
Start 13:30 3,630 Initial WL's 23.34 24.10

06/19/23 13:50 1,200 64.0 116 11,000 20.0 17.0 16.0
14:50 1,200 58.0 122 11,000 20.0 17.0 16.0
19:10 1,150 50.0 130 7,600 21.0 18.0 10.0
19:40 1,150 50.0 130 7,600 21.0 18.0 10.0
06/20/23 9:00 1,150 52.0 128 6,500 21.0 600 gal.18.0 10.0
11:00 1,200 48.0 132 8,400 20.0 17.0 16.0
14:20 1,200 46.0 134 7,800 20.0 17.0 16.0
16:20 1,200 46.0 134 7,700 20.0 17.0 16.0
06/21/23 9:00 1,200 50.0 130 6,400 20.0 1,530 gal.17.0 16.0
11:00 1,200 48.0 132 8,000 20.0 17.0 16.0
13:00 1,200 46.0 134 7,800 20.0 17.0 16.0
15:00 1,200 46.0 134 7,600 20.0 17.0 16.0
06/22/23 7:50 1,200 52.0 128 7,200 20.0 2,400 gal.17.0 16.0
9:50 1,200 50.0 130 7,200 20.0 17.0 16.0
13:30 1,200 46.0 134 7,100 20.0 17.0 16.0
15:30 1,200 46.0 134 7,100 20.0 17.0 16.0
06/23/23 11:20 1,200 50.0 130 6,800 20.0 3,510 gal. 17.0 16.0
12:50 1,200 48.0 132 7,000 20.0 17.0 16.0

End 13:30 Total fluids: 3,630 gal.Final WL's 28.63 28.68
Total free product:0 gal.

DATE TIME STINGER/WL's EXTRACTION POINTS (hg") cont. VACUUM INFLUENCE (h2o") WELL GAUGING (ft)
AS-1 AS-2
Start 13:30 Stinger(ft)
Initial WL's 23.04 24.02
CFM CFM
06/19/23 13:50 off-line off-line
14:50 2.2 2.0
19:10 2.2 2.0
19:40 2.2 2.0
06/20/23 9:00 2.4 2.0
11:00 2.4 2.0
14:20 2.4 2.0
16:20 2.4 2.0
06/21/23 9:00 2.4 2.0
11:00 2.4 2.0
13:00 2.4 2.0
15:00 2.4 2.0
06/22/23 7:50 2.4 2.0
9:50 2.4 2.0
13:30 2.4 2.0
15:30 2.4 2.0
06/23/23 11:20 2.4 2.0
12:50 2.4 2.0

End 13:30 Final WL's 28.59 28.80
Page 1 of 1
MOBILE MULTI-PHASE EXTRACTION EVENT
SITE NAME: Good Ole Boys CLIENT: WithersRavenel
INCIDENT NUMBER:
AVERAGE DEPTH TO GROUNDWATER: 23 - 25 feet
DESCRIBE SOIL IN THE SATURATED ZONE:
AVERAGE HYDRAULIC CONDUCTIVITY (if known):EXTRACTION WELLS USED FOR MMPE: MW-1 and MW-4
SPECIFICATIONS OF THE MMPE SYSTEM (cfm @ in Hg): 280 cfm @ 25.0"Hg
DRY STANDARD CUBIC FEET PER MINUTE (DSCFM) AIR FLOW CALCULATIONS (Qstd)
Date Hours Vacuum Velocity Pipe ID Temp Rel Humid Water Water Qstd(inches of Hg) (ft/min) (in) (°F) (%) Vapor (Wt%) Vapor (Vol%) (flow)

6/19/23 24.00 20.50 1175.00 6 125 55.5 0.047 0.070 194
6/20/23 48.00 20.25 1180.00 6 132 48.0 0.051 0.076 191
6/21/23 72.00 20.00 1200.00 6 133 47.5 0.052 0.077 194
6/22/23 96.00 20.00 1200.00 6 131 48.8 0.050 0.074 195
6/23/23
NOTES
Qstd = Flow at DSCFM
Vacuum = The level of vacuum being applied should be recorded from the MMPE system (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 MMPE system)
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 pipingBwsw = water vapor % by weight, i.e., pounds of water per pound of dry air, derived from the Psychrometric chart (temp Vs relative humidity)
Bws = water vapor % by volume
EQUATIONS
Bws = (Bwsw/18 lb-mole H20)/[(1/28.84 lb-mole dry air) + (Bwsw/18 lb-mole H2O)]
Qstd = (1-Water Vapor) * velocity * (PI * (diameter/24)2) * (528°R/(Temp + 460))
EMISSION CALCULATIONS
Elapsed
Time Flow PPMmeasured PPMwet PPMdry K PPMconc Cc:m Cc PMRc PMRg PMR(hour) (DSCFM) (ppm)(#C - gas)(mg/dsm3) (lb/dscf) (lb/hour) (lb/hour) (lb)
24 194 9300 9300 10000 1 10000 4990 0.000311512 3.62 4.19 100.62
48 191 7600 7600 8221 1 8221 4102 0.000256086 2.94 3.40 81.53
72 194 7450 7450 8071 1 8071 4027 0.000251404 2.92 3.38 81.20
96 195 7025 7025 7588 1 7588 3786 0.000236361 2.76 3.20 76.73

Total emissions in pounds 340.08
Total emissions as gallons (pounds / 6.152)55.28
NOTES
PPMmeasured = Actual measurements (ppm) taken with a OVA or TVA at the blower discharge piping
PPMwet = "wet" concentration
PPMdry = "dry" concentration
K = Number of carbons in calibration gas: (Methane K = 1, or Propane K = 3, or Hexane K = 6)
PPMc= PPMv, Volumetric concentration of VOC emissions as carbon, dry basis at STP
Cc:m = mg/dsm3, mass concentration of VOC emissions as carbon
Mc = 12.01 mg/mg-mole, molecular weight of carbon
K3 = 24.07 dsm3/106 mg-mole, mass to volume conversion factor at STP
Cc = lb/dcsf, mass concentration of VOC emissions as carbon, dry basis at STP
PMRc = lb/hr, pollutant mass removal rate of VOC's as carbonPMRg = lb/hr, pollutant mass removal rate of of VOC's as gasoline
PMR = lb, pollutant mass removal of VOC's as gasoline
EQUATIONS
PPMwet = PPMmeasuredPPMdry = (PPMwet)/(1-Bws)
PPMc = (PPMd)(K)
Cc:m = (PPMc)(Mc / K3)
Cc = (Cc:m)(62.43x10-9 lb-m3/mg-ft3)
PMRc = (Cc)(Qstd)(60 minute/hour)
PMRg = (PMRc)(Mg/Mcg)
PMR = (PMRg)(#hours)
MMPli Field Log
Olent: W 1 "'I'""' t'..R-s. + (Ci:,. v E E. l.
Site Name: G o o 't::. c:, LE.. 'B. o'/ S.
Extraction. Wells: rn '-' -I , /V'\ (.,.> -Z.
Job Number: o t.,, -Z3.s '7
EveotDates: ft,/11 -~/z:s/23
MATERIAL Manifest Document No.
MANIFEST Page of
TERRA NOVA
EMERGENCY PHONE NO. POST OFFICE BOX 357 TEL [phone] Zebra Job No.
[phone] HlGH POINT, NC 27261 FAX [phone]
GENERATOR INFORMATION
Name US EPA ID No.
Street Address Malling Address Phone No.
Contact
DESCRIPTION OF MATERIALS
USDOT Proper Shipping Name Hazard UN/NA Packing Containers Total Unit
HM (Complete All Items for Hazardous Materials) Class or Div ID No. Group Qty, Type Quantity Wt.Nol.
a. 3,G3,C
b.
C.
ADDITIONAL INFORMATION ERG No. Zebra Profile Coda Facility Use
a.
b.
c.
GENERATOR'S CERTIFICATION
This is to certify that the above-described materials are properly classified, described, packaged, marked and labeled, and are in
proper condition for transportation according to the applicable regulations of the Department of Transportation. I further certify that
none of the materials described above are a hazardous waste as defined by EPA 40 CFR Part 261 or any applicable state law, and
unless specifically identified above, the materials contain less than 1,000 ppm total halogens and do not contain quantifiable levels
(2 ppm) of PCBs as defined by EPA 40 CFR Parts 279 and 761
Printed/ Typed Name I Signature Mo. I bay I Yr.
TRANSPORTER INFORMATION
Transporter TN Solutions, Inc. / hereby acknowledge receipt of tho above-described materials for transport ------------------------1 from the generator site listed above.
Address
Signature Shipment Date 901 East Springfield Road
High Point, NC 27263 ..,..--....,...-------------,,.,-,,,.,.,------1' hereby acknowledge receipt of the above-described materials were received
or NCO991302669 I Unit No. from tho generator site and were transported to the facl/lty listed below.
Phone [phone] Signature Delivery Date
FACILITY INFORMATION
TN Solutions, Inc. / hereby acknowledge receipt of tho materials covered by this manifest _______________________ ...;except for any discrepancy noted below.
Facility
Address
Facility or
EPA ID No.
Phone
901 East Springfleld Road
High Point, NC 27263
NCO991302669
[phone]
Contact Bill Hunter
Signature Receipt Date
Dl• .. renancles I Rnutin" Codes I Handlna Methods
a.
b.
c.
ORIGINAL -Facility Retain COPY 2 • Return to Generator COPY 3 • Transporter Retain COPY 4 -Generator Retain
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