AS-514_7280_CA_MMPE_20230914

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

September 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 – AIR SPARGE/MOBILE MULTI-PHASE EXTRACTION EVENT Former RoadRunner Market
3000 Old Cullowhee Road
Cullowhee, Jackson County, North Carolina
Groundwater Incident Number: 7280
UST Number: AS-514
WR Project Number: 23-0307-DW
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-02 for the above referenced site approved June 19, 2023 under North Carolina Department
of Environmental Quality (NCDEQ) Contract #N70522-C. WR mobilized to the subject site on
August 7, 2023, for the purpose of performing an AS/MMPE event on select monitoring wells and utilizing air sparge well AS-1 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 August 7, 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-5 and MW-7. 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 well AS-1 and utilized an air compressor to deliver air into each air sparge well. Advanced installed a 1-in diameter PVC stingers into well MW-5 and MW-7 at a depth approximately 1-ft beneath the measured groundwater elevation on August 7, 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 at depths beneath the measured
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

groundwater elevation. This tubing was plumbed to a compressor which injected air into air sparge well AS-1. 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-5 and MW-7. 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-5 and MW-7 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-5 26.13 26.11 30.00 0.02
MW-7 --- 26.63 30.00 ---
[All measurements shown in feet (ft)] Throughout the course of the AS/MMPE event, effluent emissions ranged from 10,000 parts per million (ppm) to 18,000 ppm. In completion of the AS/MMPE event, a total of 4,170-gallons of
fluids were recovered from MW-5 and MW-7 and based on mass removal calculations, a total of
626.75 pounds or 101.88 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 August 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):

FIGURES

500'
1,000'
1,500'
KBB
FD
DRAWN BY:
07/12/2023 23-0307-DW
1
SUBJECT SITE
±0.25-ACRES
SCALE:FIGURE NO.:
PROJECT NO.:DATE:APPROVED BY:
ROADRUNNER MARKET TF#7280
3000 OLD CULLOWHEE ROAD
CULLOWHEE, JACKSON COUNTY, NC
GENERAL LOCATION MAP
1"=500 '
GRAPHIC SCALE
1 inch = 500 ft.
0 500250 1000
WithersRavenel
Engineers | Planners | Surveyors
115 MacKenan Drive | Cary, NC 27511 | t: 919.469.3340 | license #: F-1479
www.withersravenel.com
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MW-1(NOT FOUND)MW-2(NOT FOUND)MW-3(NOT FOUND)O
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LUST BASINUST'S # 2, 3, 4UST BASINUST #1OLD
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ROADMW-8MW-6MW-7MW-5MW-9MW-4AS-1KBBFDDRAWN BY:07/12/202323-0307-DW2SCALE:FIGURE NO.:PROJECT NO.:DATE:APPROVED BY:SITE MAPWithersRavenelEngineers | Planners | Surveyors115 MacKenan Drive | Cary, NC 27511 | t: 919.469.3340 | license #: F-1479 | www.withersravenel.com1"=40 'LEGENDTYPE II MONITORING WELL LOCATIONAIR SPARGE WELL LOCATIONNOTES: 1.) 2020 AERIAL OBTAINED FROM NC ONE MAP.ROADRUNNER MARKETTF#72803000 OLD CULLOWHEE ROADCULLOWHEE, JACKSON COUNTY, NCGRAPHIC SCALE1 inch = 40 ft.0402080

APPENDIX A
FIELD NOTES &
SITE PHOTOGRAPHS

PHOTOGRAPH 1 View of site with AS/MMPE equipment
PHOTOGRAPH 2 View of MW-5, AS-1, and MW-7 looking northeast

PHOTOGRAPH 3 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:

Road Runner Market
3000 Old Cullowhee Rd.
Cullowhee, NC

Prepared for:

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

August 15, 2023

TABLE OF CONTENTS

EVENT SUMMARY

MMPE FIELD LOG

MASS-REMOVAL CALCULATION

FIELD NOTES

DISPOSAL MANIFESTS

MOBILE MULTI-PHASE EXTRACTION
EVENT SUMMARY

August 15, 2023

Location: Road Runner Market
3000 Old Cullowhee Rd.
Cullowhee, NC

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

Event Dates: August 7 – 11, 2023
Advanced Job # 08 - 2352

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
60 feet of 1.5” hose to 2 wells

Extraction Well: MW-5 and MW-7

Well Initial FP / WL(ft) Final FP / WL(ft) Stinger depth(ft) Run Time
/ Changed To
MW-5 26.20 30.33 27/29 96.0 hours
MW-7 26.22 29.34 27/29 96.0 hours

Description of Event:
The MMPE event ran from 13:25 August 7, 2023, through 13:25 August 11, 2023. Air Sparge
was conducted at AS-1, simultaneously for the duration of the event. The MMPE system was
active for 96.0 hours. During the event, vacuum at the recovery pump ranged from 19.0 to 22.0
inches of mercury (hg) and stabilized at approximately 19.0 inches of mercury. Airflow rates
ranged from 1,150 to 1,300 feet per minute and stabilized at approximately 1,300 feet per
minute. System temperature ranged from 116.0 – 136.0 degrees F and humidity ranged from
44.0 to 64.0 percent. Field gauged volatile organic compounds (VOC’s) emissions reduced from
18,000 parts per-million (PPM) to 10,000 PPM throughout the event.

Groundwater / Product Mix Recovered:
During the event a total of 4,170 gallons of product/water mix were removed from the site and
properly disposed at a certified North Carolina disposal facility. No 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 4,170 gallons recovered
during the event, the average groundwater recovery rate was calculated to be approximately 43.43
gallons per hour.

Events Results:
Based on mass-removal calculations 626.75 pounds or 101.88 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: Road Runner Market
LOCATION: Cullowhee, NC
MMPE EVENT DATES: August 7 - 11, 2023
EXTRACTION POINTS: MW-5 and MW-7
AES JOB NUMBER: 08 - 2352

DATE TIME FLOW (f/m) HUM.(%) TEMP. (F)VOC's(ppm)VAC. (hg")GALLONS STINGER/WL's EXTRACTION POINTS (hg")
MW-5 MW-7
Stinger(ft)27,29 27,29
Start 13:25 Initial WL's 26.20 26.22

08/07/23 13:50 1,150 64.0 116 18,000 22.0 17.0 17.0
14:50 1,200 54.0 126 18,000 21.0 16.0 16.0
18:10 1,250 52.0 128 17,000 20.0 15.0 15.0
18:40 1,250 52.0 128 17,000 20.0 15.0 15.0
08/08/23 8:30 1,300 52.0 128 15,000 19.0 855 gal.14.0 14.0
10:30 1,200 50.0 130 15,000 21.0 16.0 16.0
15:10 1,200 46.0 134 14,000 21.0 15.0 15.0
17:10 1,250 48.0 132 14,000 20.0 14.0 14.0
08/09/23 8:50 1,300 50.0 130 13,000 19.0 1,920 gal.14.0 14.0
10:50 1,300 48.0 132 13,000 19.0 14.0 14.0
12:50 1,300 44.0 136 13,000 19.0 14.0 14.0
14:50 1,300 44.0 136 12,000 19.0 14.0 14.0
08/10/23 7:50 1,300 50.0 130 11,000 19.0 2,910 gal.14.0 14.0
9:50 1,300 50.0 130 11,000 19.0 14.0 14.0
13:20 1,300 44.0 136 10,000 19.0 14.0 14.0
15:20 1,300 44.0 136 10,000 19.0 14.0 14.0
08/11/23 10:30 1,300 48.0 132 10,000 19.0 4,020 gal. 14.0 14.0
12:40 1,300 44.0 136 10,000 19.0 14.0 14.0

END 13:25 Total fluids: 4170 gal.Final WL's 30.33 29.34
Total free product:0 gal.

DATE TIME STINGER/WL's AIR Sparge VACUUM INFLUENCE (h2o") WELL GAUGING (ft)
AS-1
Start 13:25 Stinger(ft)
Initial WL's 26.24
CFM PSI
08/07/23 13:50 off-line off-line
14:50 3.2 19
18:10 3.3 19
18:40 3.3 19
08/08/23 8:30 3.3 18
10:30 3.3 18
15:10 3.3 18
17:10 3.3 18
08/09/23 8:50 3.3 18
10:50 3.3 18
12:50 3.3 18
14:50 3.3 18
08/10/23 7:50 3.3 18
9:50 3.3 18
13:20 3.3 18
15:20 3.3 18
08/11/23 10:30 3.3 18
12:40 3.3 18

END 13:25 Final WL's 32.24
Page 1 of 1
MOBILE MULTI-PHASE EXTRACTION EVENT
SITE NAME: Road Runner Market CLIENT: WithersRavenel
INCIDENT NUMBER:
AVERAGE DEPTH TO GROUNDWATER: 26 - 27 feet
DESCRIBE SOIL IN THE SATURATED ZONE:
AVERAGE HYDRAULIC CONDUCTIVITY (if known):
EXTRACTION WELLS USED FOR MMPE: MW-5 and MW-7
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)

8/7/23 24.00 21.00 1213.00 6 125 55.5 0.046 0.069 2008/8/23 48.00 21.00 1213.00 6 131 49.0 0.050 0.074 197
8/9/23 72.00 19.00 1300.00 6 134 46.5 0.052 0.077 210
8/10/23 96.00 19.00 1300.00 6 134 46.5 0.052 0.077 210
8/11/23
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 piping
Bwsw = 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)
24 200 17500 17500 18790 1 18790 9375 0.000585305 7.04 8.14 195.45
48 197 14500 14500 15662 1 15662 7815 0.000487862 5.77 6.67 160.17
72 210 12750 12750 13812 1 13812 6892 0.000430254 5.41 6.26 150.30
96 210 10250 10250 11104 1 11104 5540 0.000345891 4.35 5.03 120.83

Total emissions in pounds 626.75
Total emissions as gallons (pounds / 6.152)101.88
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 carbon
PMRg = 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)
MMP&. Fie.Id Log
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MATERIAL
MANIFEST
~2 ~, Manifest Document No.
Page
TERRA NOVA
EMERGENCY PHONE NO.
[phone]
POST OFFICE BOX 357 TEL [phone] Zebra Job No.
HJGH POINT, NC 27261 FAX [phone] _,.
GENERATOR INFORMATION
Name US EPA ID No.
Street Address 1 r l I , 1 ,_, Mailing Address 3 Qro O)o '--U O/y --r,::_e...rr
Phone No.
Contact
DESCRIPTION OF MATERIALS
Hazard UN/NA Packing Containers
of
r '
Total USDOT Proper Shipping Name
HM (Complete All Items for Hazardous Materials) Class or Div ID No. Group Qty, Type Quantity
a. -~17b / / ,,--·· (} I -r,
' ,
b.
c.
ADDITIONAL INFORMATION ERG No. Zebra Profile Code Facility Use
a. /
b.
C.
Unit
Wt.Nol.
t
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 Jess 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.
ame / -,
( r
TRANSPORTER INFORMATION
I hereby acknowledge receipt of the above-described materials for transport
I !.
Transporter TN Solutions, Inc.
Addrus 901 East Springfield Road
High Point, NC 27263
from the generator ,yte listed above. I I ,;, /! l) =
Signature / /) / ) , I )(\, C jf.. Shipment Date
---------------..,.,.,-,,-,-,-------ti hereby acknowledge receipt of the above-described materials were received
Transporter or NCO991302669 !Unit No. from the genelator site and were transported to the facility listed below.
EPAID No.
Phono [phone] Signature Delivery Date
FACILITY INFORMATION
TN Solutions, Inc. I hereby acknowledge receipt of the materials covered by this manifest ~.,..,...---------------------I except for any discrepancy notod below.
Address
Facility
Facility or
EPA ID No.
Phone
Contact
901 East Sprlngfleld Road
High Point, NC 27263
NCO991302669
[phone]
Bill Hunter
Signature Receipt Date
.Dlscrenancles / Routlnn Codes/ Handlna Methods a.
b. l
c.
ORIGINAL· Facility Retain COPY 2 • Return to Generator COPY 3 -Transporter Retain COPY 4 • Generator Retain