MO-7049_27981_CA_MMPE_20191209

FREE PRODUCT RECOVERY REPORT
Former McCain Grocery (Incident # 27981)
10018 Lancaster Highway
Waxhaw, Union County, North Carolina
December 13, 2019
Terracon Project No. 71159685A

Prepared for:
North Carolina Department of Environmental Quality
Division of Waste Management
Raleigh, North Carolina

Prepared by:
Terracon Consultants, Inc.
Charlotte, North Carolina

Terracon Consultants, Inc. 2701 Westport Road Charlotte, NC 28208
P 704-509-1777 F 704-509-1888 terracon.com
December 13, 2019

Ms. Sharon Ghiold
North Carolina Department of Environmental Quality
Division of Waste Management
1646 Mail Service Center
Raleigh, North Carolina 27699-1646

Email: [e-mail]

Re: Letter Report
Former McCain Grocery
10018 Lancaster Highway
Waxhaw, Union County, North Carolina
UST Incident Number: 27981
Terracon Project No. 71159685A

Dear Ms. Ghiold:

Terracon Consultants, Inc. (Terracon) is pleased to submit this Letter Report for the above
referenced property. This report has been prepared in general accordance with North Carolina
Department of Environmental Quality (NCDEQ), UST Section Guidelines for Assessment and
Corrective Action for UST Releases, dated July 15, 2008, revised December 2013 and Task
Authorization No. 03, approved on October 10, 2019.

Terracon personnel and Advanced Environmental Services (AES) mobilized to the site on
November 11, 2019 to conduct a 96-hour Mobile Multi-Phase Extraction (MMPE) event at monitoring
wells MW-1R and MW-6 (Figure 1). Prior to commencement of MMPE activities, Terracon
measured free product thicknesses in monitoring wells MW-1R (0.01 feet) and MW-6 (0.53 feet).
The MMPE event was conducted by AES from November 11, 2019 to November 15, 2019.
According to the AES field report dated December 2, 2019, a total of 4,791 gallons of a
product/water mixture was recovered from the two wells and mass balance calculations indicated
total VOC emissions removed from the wells equated to 24.04 gallons. After the MMPE event, no
free product was identified in the on-site wells. A copy of the AES field report is provided in
Appendix A. Terracon has also provided a copy of our field notes in Appendix B and photographs
in Appendix C.

Terracon recommends sampling in the first quarter of 2020 to monitor the effectiveness of the
MMPE event and conduct O-sox maintenance in well MW-6.

FIGURE

SITE PLAN
MCCAIN GROCERY (INCIDENT # 27981)
10018 Lancaster Highway
Waxhaw, Union County, NC
2701 Westport Road
Charlotte, NC
71159685A
SAC
CLC
CLC
1” ~ 45’
December 2019
Scale:
1
FigureProject Manager:
Drawn by:
Checked by:
Approved by:
Project No.
File Name:
Date:
FJD
McCain
MW-10
MW-2
MW-1R
denotes approximate site boundary
denotes approximate location of
groundwater monitoring well
MW-4
denotes approximate excavation
denotes approximate location of former USTs
Former Dispenser Location
MW-3
MW-5
MW-6

APPENDIX A
MMPE REPORT

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

MOBILE
MULTI-PHASE
EXTRACTION REPORT

Site Location:

McCain Grocery
10018 Lancaster Hwy
Waxhaw, North Carolina

Prepared for:

Terracon
2701 Westport Road
Charlotte, North Carolina 28208
PM – Victoria M. Larson

December 2, 2019

TABLE OF CONTENTS

EVENT SUMMARY

MMPE FIELD LOG

MASS-REMOVAL CALCULATION

FIELD NOTES

DISPOSAL MANIFEST

MOBILE MULTI-PHASE EXTRACTION
EVENT SUMMARY

December 2, 2019

Location: McCain Grocery
10018 Lancaster Hwy
Waxhaw, North Carolina

Client: Terracon
2701 Westport Road
Charlotte, North Carolina 28208

Event Dates: November 11 - 15, 2019
Advanced Job # 11 - 1961

Advanced Personnel: Scott Crook and Lee Heilig

MMPE System: MMPE system rated 24”hg at 140 CFM
4’ discharge stack - 2” diameter
8,000 - gallon tanker
Approximately 90’of 1.5” hose to 2 wells

Extraction Well: MW-1R and MW-6

Well Initial FP/WL(ft) Final FP/WL(ft) Stinger depth(ft) Run Time
MW-1R 42.57/42.58 44.33 43 96.0 hours
MW-6 40.42/40.95 42.61 41 96.0 hours

Description of Event:
The MMPE event ran from 12:20 November 11, through 12:20 November 15, 2019. The MMPE
system was active for 96.0 hours. During the event vacuum at the recovery pump ranged from
16.0 to 19.5 inches of mercury (hg) and stabilized at approximately 17.0 inches of mercury.
Airflow rates ranged from 3,000 to 3,700 feet per minute and stabilized at 3,200 feet per minute.
System temperature ranged from 106 to 148 degrees (F) and humidity ranged from 52 to 99
percent. Field gauged volatile organic compounds (VOC’s) decreased from 18,000 parts per-
million (PPM) to 7,600 (PPM) throughout the event.

Groundwater / Product Mix Recovered:
During the event, a total of 4,791 gallons of product/water mix were removed from the site and
properly disposed at a certified North Carolina disposal facility. No free product was identified
in the tanker following the event. 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 4,791
gallons recovered, the average groundwater recovery rate was calculated to be approximately
49.90 gallons per hour.

Events Results:
Based on mass-removal calculations 147.91 pounds or 24.04 gallons of VOC’s were removed as
vapor. Using Dwyer Magnehelic gauges, vacuum influence (inches of water) was measured at
monitoring points MW-2 and MW-3. No vacuum influence was observed in MW-2 or MW-3.
Draw-down was observed in MW-2 and MW-3 at 0.09 and 0.09 feet respectively. Following
the event, no free product was identified in any well.

MMPE FIELD LOG:
CLIENT: Terracon
JOB NAME: McCain Grocery
LOCATION: Newton, NC
MMPE EVENT DATES: November 11 - 15, 2019
EXTRACTION POINTS: MW-1R and MW-6
AES JOB NUMBER: 11 - 1961
DATE TIME FLOW (f/m) HUM.(%) TEMP. (F)VOC's(ppm)VAC. (hg")GALLONS STINGER/WL's EXTRACTION POINTS (hg")
MW-1R MW-6
Start 12:20 Stinger(ft)43 41
Initial WL's 42.57/42.58 40.42/40.95
11/11/19 12:50 3,000 99.9 106 18,000 19.5 17.0 16.0
14:00 3,400 76.0 134 17,000 17.5 15.0 14.0
18:00 3,300 68.0 138 15,000 18.0 15.0 14.0
19:00 3,300 70.0 136 15,000 18.0 15.0 14.0
11/12/19 8:50 3,300 68.0 138 13,000 18.0 1,230 gal.15.0 14.0
10:00 3,300 66.0 140 13,000 18.0 15.0 14.0
16:20 3,200 62.0 142 10,000 17.0 1,620 gal.9.0 9.0
17:30 3,200 62.0 142 10,000 17.0 9.0 9.0
11/13/19 9:10 3,200 60.0 142 9,200 17.0 2,335 gal.9.0 9.0
10:10 3,200 64.0 138 9,200 17.0 9.0 9.0
11:20 3,200 64.0 138 8,800 17.0 9.0 9.0
12:20 3,200 64.0 138 8,800 17.0 9.0 9.0
11/14/19 9:30 3,200 54.0 146 8,400 17.0 3,356 gal.9.0 9.0
10:30 3,200 60.0 142 8,400 17.0 9.0 9.0
14:50 3,200 52.0 148 8,200 17.0 9.0 9.0
15:50 3,200 60.0 142 8,200 17.0 9.0 9.0
11/15/19 7:30 3,200 66.0 136 7,600 17.0 4,309 gal.9.0 9.0
11:30 3,700 58.0 138 10,000 16.0 14.0 13.0
End 12:20 Final WL's 44.33 42.61
Total fluids: 4,791 gal.
Total free product:Sheen
DATE TIME STINGER/WL's EXTRACTION POINTS (hg") cont. VACUUM INFLUENCE (h2o") WELL GAUGING (ft)
MW-2 MW-3 MW-2 MW-3
Start 12:20 Stinger(ft)
Initial WL's
11/11/19 0.00 0.00 38.73 39.13
11/12/19 0.00 0.00 38.79 39.19
11/13/19 0.00 0.00 38.82 39.23
11/14/19 0.00 0.00 38.81 39.21

11/15/19 0.00 0.00 38.82 39.22

Final Wl's
End 12:20
Page 1 of 1
MOBILE MULTI-PHASE EXTRACTION EVENT
SITE NAME: McCain Grocery CLIENT: Terracon
INCIDENT NUMBER:
AVERAGE DEPTH TO GROUNDWATER: 40 - 43 feet
DESCRIBE SOIL IN THE SATURATED ZONE:
AVERAGE HYDRAULIC CONDUCTIVITY (if known):
EXTRACTION WELLS USED FOR MMPE: MW-1R and MW-6
SPECIFICATIONS OF THE MMPE SYSTEM (cfm @ in Hg): 140 cfm @ 24.0"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)
11/11/19 24.00 18.25 3250.00 2 129 78.3 0.079 0.112 56
11/12/19 48.00 17.50 3250.00 2 141 64.5 0.091 0.127 54
11/13/19 72.00 17.00 3200.00 2 140 63.0 0.086 0.121 54
11/14/19 96.00 16.75 3325.00 2 141 59.3 0.083 0.117 56
11/15/19
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 56 16250 16250 18307 1 18307 9134 0.000570261 1.93 2.24 53.66
48 54 11500 11500 13177 1 13177 6575 0.000410457 1.34 1.55 37.22
72 54 9000 9000 10240 1 10240 5109 0.000318981 1.03 1.20 28.73
96 56 8550 8550 9687 1 9687 4833 0.000301752 1.02 1.18 28.30
Total emissions in pounds 147.91
Total emissions as gallons (pounds / 6.152)24.04
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)
~1MPE Field Log
MMPE Field Log
Oient: / c. ~A-c ti. r-.)
Site Name: /'\ A> l;> R oC.E
Extraction Wells: V'l,....LJ-e M ~-
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Job Number:
Event Dates: I
Rewards Program ID:
You were checked out by:
You were checked in by:
Total Balance Due:
GP-TSC4503
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0.00
Quality Inn & Suites (NC441)
Monroe, NC 28110
2351 W. Roosevelt Blvd.
[e-mail]
[phone]
Account:
Date:
Room:
Arrival Date:
Departure Date:
Check In Time:
Check Out Time:11/15/19 11:40 AM
11/11/19 2:25 PM
11/15/19
11/11/19
110 LSTATE
12/3/19
684694924
306 BRADLEY ST
BURLINGTON
GREENSBORO, NC 27410
CROOK, TIMOTHY
Post Date Description Comment Amount
11/11/19 Visa Payment (309.32)
XXXXXXXXXXXX9650
11/11/19 Room Charge #110 CROOK, TIMOTHY 69.20
11/11/19 State Tax 4.67
11/11/19 Occupancy Tax 3.46
11/12/19 Room Charge #110 CROOK, TIMOTHY 69.20
11/12/19 State Tax 4.67
11/12/19 Occupancy Tax 3.46
11/13/19 Room Charge #110 CROOK, TIMOTHY 69.20
11/13/19 State Tax 4.67
11/13/19 Occupancy Tax 3.46
11/14/19 Room Charge #110 CROOK, TIMOTHY 69.20
11/14/19 State Tax 4.67
11/14/19 Occupancy Tax 3.46
Folio Summary 11/11/19 - 11/14/19
Room Charge 276.80
State Tax 18.68
Occupancy Tax 13.84
Visa Payment (309.32)
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APPENDIX B
FIELD NOTES

APPENDIX C
PHOTOGRAPHS

McCain Grocery (Incident #27981)
Waxhaw, North Carolina
Project Number 71159685A
Photos Taken November 11, 2019

Responsive ■ Resourceful ■ Reliable
Photo 1 – View of monitoring well MW-1R with generator.

Photo 2 – View of monitoring well MW-6 with MMPE piping and stinger installed.
McCain Grocery (Incident #27981)
Waxhaw, North Carolina
Project Number 71159685A
Photos Taken November 11, 2019

Responsive ■ Resourceful ■ Reliable
Photo 3 – View of MMPE service trailer.