WS-1257_30594_CA_FPR_20200110_Optimized

FREE PRODUCT RECOVERY REPORT
Former Johnson’s Grocery (Incident # 30594)
5870 NC Highway 268
Dobson, Surry County, North Carolina
January 10, 2020
Terracon Project No. 71149156A

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
January 10, 2020

Mr. Herb Berger
North Carolina Department of Environmental Quality
Division of Waste Management
1646 Mail Service Center
Raleigh, North Carolina 27699-1646

Email: [e-mail]

Re: Free Product Recovery Report
Former Johnson’s Grocery
5870 NC Highway 268
Dobson, Surry County, North Carolina
UST Incident Number: 30594
Terracon Project No. 71149156A

Dear Mr. Berger:

Terracon Consultants, Inc. (Terracon) is pleased to submit this Free Product Recovery 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. 05, approved on December 23, 2019.

Terracon personnel and Advanced Environmental Services (AES) mobilized to the site on January
13, 2020 to conduct a 96-hour Mobile Multi-Phase Extraction (MMPE) event at monitoring well MW-
1 (Figure 1). Prior to commencement of MMPE activities, Terracon measured 0.12 feet of free
product in monitoring well MW-1. The MMPE event was conducted by AES from January 13, 2020
to January 17, 2020. According to the AES field report dated February 6, 2020, a total of 2,357
gallons of a product/water mixture was recovered from the well and mass balance calculations
indicated total VOC emissions removed from the well equated to 3.77 gallons. After the MMPE
event, free product was not 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 monitoring the effectiveness of the MMPE event and conducting O-sox
maintenance in well MW-2 during the semi-annual sampling event that will be conducted in March
2020.

Former Johnson’s Grocery
Dobson, North Carolina
Project No. 71149156A
Incident No. 30594
January 10, 2020

If you have any questions regarding this report or the assessment activities, please contact us at
704-509-1777.

Sincerely,
Terracon Consultants, Inc.

Victoria M. Larson, GIT Christopher L. Corbitt, PG
Field Geologist Senior Geologist

Attachments: Figure 1 – Site Plan
Appendix A – MMPE Report
Appendix B – Field Notes
Appendix C – Photographs

FIGURE

2
Figure
DIAGRAM IS FOR GENERAL LOCATION ONLY,
AND IS NOT INTENDED FOR CONSTRUCTION
PURPOSES 2701 Westport Road
Charlotte, NC
Former Johnson’s Grocery (Incident #30594)
5870 NC Highway 268
Dobson, Surry County, NC
SITE PLANProject Manager:
Drawn by:
Checked by:
Approved by:
VML Project No.
File Name:
Date:
Scale:
71149156A
VML
Jan. 2020CLC
2CLC
1” ~ 60’
denotes approximate site
boundary
denotes groundwater
monitoring well
MW-5
(Not Located)
MW-6
(Not Located)
MW-1
MW-2
MW-3
MW-4
MW-7
VACANT FORMER
GROCERY STORE AUTO REPAIR
SERVICE CENTER
GARAGE
CANOPY
FORMER TANK
BASIN
denotes approximate location
of drainage feature
LEGEND:
MW-8
0 ft 60 ft

APPENDIX A
MMPE REPORT

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

MOBILE
MULTI-PHASE
EXTRACTION REPORT

Site Location:

Former Johnson’s Grocery
5870 NC Hwy 268
Dobson, North Carolina

Prepared for:

Terracon Consultants Inc.
2701 Westport Road
Charlotte, North Carolina 28208
PM – Flora D’Souza

February 6, 2020

TABLE OF CONTENTS

EVENT SUMMARY

MMPE FIELD LOG

MASS-REMOVAL CALCULATION

FIELD NOTES

DISPOSAL MANIFEST

MOBILE MULTI-PHASE EXTRACTION
EVENT SUMMARY

February 6, 2020

Location: Former Johnson’s Grocery
5870 NC Hwy 268
Dobson, North Carolina

Client: Terracon Consultants, Inc.
2701 Westport Road
Charlotte, North Carolina 28208

Event Dates: January 13 - 17, 2020
Advanced Job # 01 - 2002

Advanced Personnel: Scott Crook and Lee Heilig

MMPE System: MMPE system rated 24”hg at 140 CFM
4’ discharge stack - 2” diameter
6,000 - gallon tanker
Approximately 140’of 1.5” hose to 1 well

Extraction Well: MW-1

Well Initial FP/WL(ft) Final FP/WL(ft) Stinger depth(ft) Run Time
MW-1 21.94/22.06 24.24 23/24/25 96.0 hours

Description of Event:
The MMPE event ran from 11:30 January 13, through 11:30 January 17, 2020. The MMPE
system was active for 96.0 hours. During the event vacuum at the recovery pump maintained
23.0 inches of mercury. Airflow rates maintained 2,500 feet per minute. System temperature
ranged from 114.0 – 142.0 degrees (F) and humidity ranged from 58.0 to 99.0 percent. Field
gauged volatile organic compounds (VOC’s) decreased from 4,200 parts per-million (PPM) to
1,900 (PPM) throughout the event.

Groundwater / Product Mix Recovered:
During the event, a total of 2,357 gallons of product/water mix were removed from the site and
properly disposed at a certified North Carolina disposal facility. 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 2,357 gallons recovered, the average groundwater recovery rate was
calculated to be approximately 24.55 gallons per hour.

Events Results:
Based on mass-removal calculations 23.18 pounds or 3.77 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-8. No vacuum influence was observed at either monitoring
point. Draw-down was observed in MW-2 and MW-8 at 0.19 and 0.09 feet respectively.
Following the event, no free product was identified in any well.

MMPE FIELD LOG:
CLIENT: Terracon
JOB NAME: Former Johnson's Grocery
LOCATION: Dobson, NC
MMPE EVENT DATES: January 13 - 17, 2020
EXTRACTION POINTS: MW-1
AES JOB NUMBER: 01 - 2002
DATE TIME FLOW (f/m) HUM.(%) TEMP. (F)VOC's(ppm)VAC. (hg")GALLONS STINGER/WL's EXTRACTION POINTS (hg")
MW-1
Stinger(ft)23,24,25
Start 11:30 Initial WL's 21.94/22.06

01/13/20 11:50 2,500 99 114 4,200 23.0 20.0
12:50 2,500 62 138 3,600 23.0 20.0
15:10 2,500 58 142 2,800 23.0 20.0
16:10 2,500 58 142 2,600 23.0 20.0
01/14/20 8:30 2,500 62 138 2,000 23.0 20.0
9:30 2,500 60 140 2,000 23.0 20.0
13:40 2,500 58 142 2,000 23.0 20.0
14:40 2,500 58 142 2,000 23.0 20.0
01/15/20 9:10 2,500 60 140 2,100 23.0 20.0
10:10 2,500 60 140 2,100 23.0 20.0
15:20 2,500 58 142 2,000 23.0 20.0
16:20 2,500 58 142 2,000 23.0 20.0
01/16/20 8:50 2,500 62 138 1,900 23.0 20.0
9:50 2,500 62 138 1,900 23.0 20.0
14:30 2,500 58 142 2,000 23.0 20.0
15:30 2,500 58 142 2,000 23.0 20.0
01/17/20 9:50 2,500 62 138 1,900 23.0 20.0
10:50 2,500 60 140 1,900 23.0 20.0

Final WL's 24.24
End 11:30 Total fluids: 2,357 gal.
Total free product:sheen
DATE TIME VACUUM INFLUENCE (H20)WELL GAUGING (ft)
MW-2 MW-8 MW-2 MW-8
Start 11:30
01/13/20 11:50 0.00 0.00 20.44 24.11
01/14/20 9:00 0.00 0.00 20.50 24.15
01/15/20 9:50 0.00 0.00 20.55 24.17
01/16/20 9:50 0.00 0.00 20.60 24.19
01/17/20 10:50 0.00 0.00 20.63 24.20

End 11:30
Page 1 of 1
MOBILE MULTI-PHASE EXTRACTION EVENT
SITE NAME: Former Johnson's Grocery CLIENT: Terracon
INCIDENT NUMBER:
AVERAGE DEPTH TO GROUNDWATER: 21 - 22 feet
DESCRIBE SOIL IN THE SATURATED ZONE:
AVERAGE HYDRAULIC CONDUCTIVITY (if known):
EXTRACTION WELLS USED FOR MMPE: MW-1
SPECIFICATIONS OF THE MMPE SYSTEM (cfm @ in Hg): 140 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)
1/13/20 24.00 23.00 2500.00 2 134 69.3 0.082 0.116 43
1/14/20 48.00 23.00 2500.00 2 141 59.5 0.083 0.117 42
1/15/20 72.00 23.00 2500.00 2 141 59.0 0.084 0.119 42
1/16/20 96.00 23.00 2500.00 2 140 60.5 0.082 0.116 42
1/17/20
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 43 3300 3300 3734 1 3734 1863 0.000116301 0.30 0.35 8.31
48 42 2000 2000 2266 1 2266 1131 7.05853E-05 0.18 0.21 4.98
72 42 2050 2050 2326 1 2326 1161 7.24522E-05 0.18 0.21 5.10
96 42 1925 1925 2178 1 2178 1087 6.78423E-05 0.17 0.20 4.80
Total emissions in pounds 23.18
Total emissions as gallons (pounds / 6.152)3.77
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)
Rewards Program ID:
You were checked out by:
You were checked in by:
Total Balance Due:
GP-TSC4503
lm
tsmith
0.00
Quality Inn (NC133)
Mount Airy, NC 27030
2136 Rockford St.
[e-mail]
[phone]
Account:
Date:
Room:
Arrival Date:
Departure Date:
Check In Time:
Check Out Time:1/17/20 12:27 PM
1/13/20 2:24 PM
1/17/20
1/13/20
145 SSC
2/6/20
692926312
306 BRADLEY ST
BURLINGTON, NC 27410
ADVANCED ENVIRONMENTAL SERVICES
CROOK, TIMOTHY
Post Date Description Comment Amount
1/13/20 Room Charge #145 CROOK, TIMOTHY 71.99
1/13/20 State Tax 5.04
1/13/20 Occupancy Tax 4.32
1/14/20 Room Charge #145 CROOK, TIMOTHY 71.99
1/14/20 State Tax 5.04
1/14/20 Occupancy Tax 4.32
1/15/20 Room Charge #145 CROOK, TIMOTHY 71.99
1/15/20 State Tax 5.04
1/15/20 Occupancy Tax 4.32
1/16/20 Room Charge #145 CROOK, TIMOTHY 71.99
1/16/20 State Tax 5.04
1/16/20 Occupancy Tax 4.32
1/17/20 Visa Payment (325.40)
XXXXXXXXXXXX9650
Folio Summary 1/13/20 - 1/17/20
Room Charge 287.96
State Tax 20.16
Occupancy Tax 17.28
Visa Payment (325.40)
Balance Due: 0.00
Congratulations. You are earning Choice Privileges Points for this stay.
x_______________________________________________________
If payment by credit card, I agree to pay the above total charge amount
according to the card issuer agreement.
This rate is eligible for partner rewards. If this rate is changed, you may no
longer be entitled to Choice Privileges points.

APPENDIX B
FIELD NOTES

APPENDIX C
PHOTOGRAPHS

Johnson’s Grocery (Incident #30594)
Dobson, North Carolina
Project Number 71149156A
Photos Taken January 13, 2020

Responsive ■ Resourceful ■ Reliable
Photo 1 – View of monitoring well MW-1 and safety cones.

Photo 2 – View of the MMPE service trailer and storage tank and vacuum truck.
Johnson’s Grocery (Incident #30594)
Dobson, North Carolina
Project Number 71149156A
Photos Taken January 13, 2020

Responsive ■ Resourceful ■ Reliable
Photo 3 – View of Johnson’s Grocery site.