WS-2669_6146_GW_CME_20150227

7606 Whitehall Executive Center Drive
Charlotte, NC 28273
Tel: [phone]
Fax: [phone]
www.atcassociates.com
N.C. Engineering License No. C-1598

February 27, 2015

Mr. Herb Berger
North Carolina Department of Environment and Natural Resources
Division of Waste Management – Underground Storage Tank Section
1637 Mail Service Center
Raleigh, NC 27699

Re: Federal/State-Lead Letter Report
Moore’s Exxon
7390 North Carolina Highway 16
Glendale Springs, Ashe County, North Carolina 28694
NCDENR Incident #6146
ATC Project No. Z045000030
Task Authorization: TA-2

Dear Mr. Berger:

ATC Associates of North Carolina, P.C. (ATC) is pleased to submit the results of the Aggressive
Fluid/Vapor Recovery (AFVR) event, and installation and sampling of a Type II groundwater
monitoring well at the former Moore’s Exxon located at 7390 North Carolina Highway 16,
Glendale Springs, Ashe County, North Carolina. Figure 1 depicts the site on a topographic map,
and Figure 2 is a site map with pertinent site features and the location of the installed monitoring
well. The AFVR event and monitoring well installation and sampling were performed based on
an October 15, 2014, Task Authorization (TA-2) by the Trust Fund Branch of the Underground
Storage Tank (UST) Section, Division of Waste Management, North Carolina Department of
Environment and Natural Resources (NCDENR). The work is being performed as part of the
State Lead Contract #N14004i between NCDENR and ATC.

A former kerosene UST at the site released product to the subsurface during its removal in 1990. A
subsequent release was identified during the removal of one of the site’s former gasoline USTs. The
site has been demolished and is now the site of the Glendale Springs Volunteer Fire Department.

As part of the prior TA-1, ATC performed groundwater monitoring activities at the site on July
8, 2014. Results from the groundwater monitoring event indicated VOC impact, including free
product detected in monitoring well MW-1 at a thickness of 0.11 feet. Petroleum constituents
were detected in all of the sampled monitoring wells below 2L Standards except monitoring well
MW-3R which contained concentrations of benzene, naphthalene, and n-propylbenzene
exceeding 2L Standards. At the conclusion of the groundwater monitoring event, ATC
recommended the installation of the additional monitoring wells to further assess and delineate
the petroleum subsurface impact. ATC also recommended an AFVR event to remove free phase
petroleum product from monitoring well MW-1 and to reduce concentrations in MW-3R below
2L Standards.

As part of the TA-2, A & D Environmental Services, LLC (A&D) was subcontracted to perform
one (1), ten-hour AFVR event. Monitoring wells MW-1 and MW-3R were used as the extraction

Letter Report February 27, 2015
Moore’s Exxon, Incident #6146 ATC Project No 045.18514.2052

points for the ten-hour AFVR event. Prior to performing the AFVR event, MW-1 and MW-3R
were gauged for liquid levels. Based on initial gauging data for the AFVR event, free product
was not detected in the monitoring wells. Upon completion of the AFVR event, the monitoring
wells were again gauged for liquid levels, and free product was not detected.

During AFVR activities, a liquid ring vacuum pump unit is plumbed to the designated extraction
point, and a drop pipe is extended into the well through an airtight seal at the top of the well
casing (TOC) and into the water column. Throughout the AFVR process, a cone of depression
forms around a designated recovery point by drawing down the groundwater surface levels, thus
causing impacted water surrounding the recovery point to be extracted. Soil petroleum vapor
within the cone of depression and the overlying vadose zone are removed as vapor by air passing
through the soil.

On November 7, 2014, ATC and A&D conducted a 10-hour AFVR event that began at 0800 and
ended at 1800. The weather was most cloudy with precipitation in the afternoon, the afternoon
high temperature of 50 oF. The AFVR event generated approximately 673 gallons of petroleum
impacted groundwater. Field notes and the waste disposal manifest from the AFVR event are
provided in Appendix A.

As part of the TA-2, ATC also installed one groundwater monitoring well, MW-13 at the site to
further delineate petroleum impact. Prior to the field work, ATC provided notification to North
Carolina one-call and produced a health and safety plan for the site work. On December 2, 2014,
ATC and a North Carolina-registered well driller mobilized to the site to install one groundwater
monitoring well. The monitoring well was installed at 7414 NC Highway 16. The access
agreement was signed on November 16, 2014 and is located in Appendix B. The property owner
of 107 Trading Post Road denied access for the installation of a monitoring well. A copy of the
denied access agreement is included in Appendix B. Figure 2 depicts the site layout and the
location of monitoring well, that was installed downgradient of the UST basin.

The driller installed the well utilizing a track mounted GeoProbe® equipped with direct push
technology to a total depth of 30 feet below ground surface (30 ft bgs). A Type II, 2-inch
diameter, schedule 40 PVC monitoring well was constructed with 0.010-inch factory-slotted well
screen from the base of the borehole at 30 ft bgs to 15 ft bgs, and riser casing was extended to
ground surface. A sand pack was installed in the annulus from the base of the boring to 13 ft bgs,
followed by a foot of sodium bentonite as a seal, and a sodium bentonite-infused grout from the
top of the seal to ground surface. The well was finished with a flush mounted square well pad
containing a steel access port, and locked compression cap was placed on the top of casing
(TOC). The well construction record is included in Appendix C.

On December 2, 2014 after the installation of the the monitoring well, monitoring well MW-13
was sampled. The depth to water was gauged from the TOC in MW-13 prior to purging, and the
well construction and gauging information for MW-13 is provided in Table 1. Prior to sampling,
the well was purged of three standing water columns using a new disposable bailer. The water
sample was collected in laboratory-supplied, preserved containers; entered into chain of custody
control; placed on ice; and shipped to North Carolina-accredited Con-Test Analytical Laboratory
in East Longmeadow, Massachusetts. The groundwater samples were analyzed by EPA Method

TABLES
TABLE 1
MONITORING WELL INFORMATION
Moore's Exxon
7390 NC Highway 16
Glendale Springs, Ashe County, North Carolina
NCDENR Incident # 6146

MW-13 12/2/2014 30.0 15-30 22.60 100.14
Notes:
MW-13 installed on December 2, 2014.
TOC = Top of Casing
MW-13 TOC surveyed and referenced to the TOC elevation of previously surveyed MW-01
Well ID Date Gauged TOC Elevation
(Feet)
Depth of Well
(Feet)
Well Screen
Interval
(Feet)
Depth to
Groundwater
(Feet)
TABLE 2
GROUNDWATER ANALYTICAL DATA
Moore's Exxon
7390 NC Highway 16
Glendale Springs, Ashe County, North Carolina
NCDENR Incident # 6146
BenzeneTolueneEthylbenzeneTotal XylenesMethyl Tertiary Butyl EtherIsopropylbenzene (Cumene)Naphthalenen-Propylbenzene1,3,5-Trimethylbenzene 1,2,4-Trimethylbenzene MW-13 12/2/2014 <0.079 <0.090 <0.092 <0.029 <0.090 <0.11 <0.12 <0.094 <0.10 <0.18
1 600 600 500 20 70 6 70 400 400
5,000 260,000 84,500 85,500 20,000 25,000 6,000 30,000 25,000 28,500
Notes:
"<" = Not Detected at or above the laboratory detection limit
Concentrations are reported in micrograms per liter (ug/l) or parts per billion (ppb)
Concentrations highlighted and in bold print equal or exceed the January 1, 2010 NCDENR 15A 2L NCAC Groundwater Standard (2L Standard).
GCL = Gross Contamination Level
J = Estimated value below method reporting limit
2L Standard (ug/l)
GCL (ug/l)
Well ID Sample Date
Concentrations in ug/L

FIGURES
.

CAD FILE PREP. BY REV. BY SCALE PROJECT NO.
TITLE
DATE
REFERENCE: USGS 7.5-MINUTE MAP, GLENDALE SPRINGS, NORTH
CAROLINA. DATED 1967
LATITUDE:ƒ1257+
LONGITUDE:ƒ:(67
SITE
Trading Post Road
NC Hi
g
h
w
a
y

1
6GlendaleFireDepartmentFormerMoore'sExxonMW-1MW-2MW-9MW-3RMW-3RMW-7MW-6MW-5MW-1RMW-11MW-4MW-12MW-10MW-10RMW-13LEGENDMonitoring Well LocationDestroyed MonitoringWell LocationPROJECT NO.
NOTES:
DATE
TITLE
SCALEREV. BYPREP. BYCAD FILESource: NC GeospatialDatabaseRefer to Table 1 for addresses
associated with water supply well
locations.
APPENDIX A
APPENDIX B
APPENDIX C
December 2014
TUESDAY, DECEMBER 2, 2014 AT 06:00
PH arrives at office to pick up equipment and load vehicle for well
install/sampling.
7606 WHITEHALL EXECUTIVE CENTER DR, CHARLOTTE, NC, UNITED STATES • 50° PARTLY
CLOUDY
TUESDAY, DECEMBER 2, 2014 AT 06:15
PH departs office for site.
7606 WHITEHALL EXECUTIVE CENTER DR, CHARLOTTE, NC, UNITED STATES • 50° PARTLY
CLOUDY
TUESDAY, DECEMBER 2, 2014 AT 09:37
Walk site. Wait arrival of subcontractor CSI. Fill out H&S paperwork.
7390 NC HIGHWAY 16 S, WEST JEFFERSON, NC, UNITED STATES • 41° LIGHT SNOW
TUESDAY, DECEMBER 2, 2014 AT 10:08
Subcontractor CSI arrives on site. Discuss H&S, sign appropriate
paperwork. Walk site and discuss the location for the well to be
installed. The well could not be installed in the location indicated.
The location requested was on an embankment at an approximately
20˚ slope. Inquired to see if the property owner was on site. I was
advised the property owner was not in but was offered contact via
phone. After some discussion with the property owner the decision
was made to locate the well in the right of way at another location
as noted in the image above. The property owner did not want the
well encroaching upon his property too much. The property owner
advised that it would be better if the install could be put off until
such a time that he was available to meet before work began. I
advised the property owner that it wouldn’t be possible to put off
the install and that I would find a location close to the right of way to
install the well. The property owner offered no objections. As a side
note the property owner has taken issue with how state dot has not
been cooperative with work on a road that runs behind his property.
As such he sees no reason to cooperate with any one with or
representing a state agency.
TUESDAY, DECEMBER 2, 2014 AT 11:23
After determining the approximate location for the well to be based
on the discussion with the property owner and the utility locations,
hand clearing the boring location begun. The location was observed
to have a fiber optic line indicated by locate services, while the
other side of the location had a storm drain. These utilities ran along
the road and the location of our well was centered between the two
with a little better than 5’ of clearance to either utility. Several
boring locations were started as asphalt debris was encountered.
We discussed the situation and decided that the asphalt was likely
debris from or part of an old road surface and I allowed the
aggressive use of a spud bar to break up the asphalt. A little at a
time and using a bright flashlight to observe the bottom of the bore
hole the asphalt was broken up enough to resume hand clearing
with a hand auger.
7390 NC HIGHWAY 16 S, WEST JEFFERSON, NC, UNITED STATES • 39° FOG
TUESDAY, DECEMBER 2, 2014 AT 12:58
Determining location and hand clearing several locations complete.
Well installations begins. Well installed to 30’ with screen from 30’
to 15’. DTW 22.60'. Well developed as much as possible. The well
will need further development as it was slow to recharge.
7390 NC HIGHWAY 16 S, WEST JEFFERSON, NC, UNITED STATES • 39° MIST AND FOG
TUESDAY, DECEMBER 2, 2014 AT 13:30
Water sample taken.
7390 NC HIGHWAY 16 S, WEST JEFFERSON, NC, UNITED STATES • 39° FOG
TUESDAY, DECEMBER 2, 2014 AT 13:35
Well pad construction begins.
7390 NC HIGHWAY 16 S, WEST JEFFERSON, NC, UNITED STATES • 39° FOG
TUESDAY, DECEMBER 2, 2014 AT 14:02
Well pad completed. Image above. MW-01 elevation 4.40'. MW-13
elevation 4.26'. Clean up and equipment decon begins.
7390 NC HIGHWAY 16 S, WEST JEFFERSON, NC, UNITED STATES • 39° FOG
TUESDAY, DECEMBER 2, 2014 AT 14:46
Clean up and decon complete. Subcontractor CSI departs site.
Cardno departs site a few minutes later to return to office.
7390 NC HIGHWAY 16 S, WEST JEFFERSON, NC, UNITED STATES • 39° FOG
TUESDAY, DECEMBER 2, 2014 AT 17:12
PH arrives office. Off loads equipment and departs for home.
7606 WHITEHALL EXECUTIVE CENTER DR, CHARLOTTE, NC, UNITED STATES • 46°
CLOUDY
Created in Day One
APPENDIX D
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Table of Contents
Sample Summary 3
Case Narrative 4
Sample Results 5
14L0266-01 5
Sample Preparation Information 7
QC Data 8
Volatile Organic Compounds by GC/MS 8
B111632 8
Flag/Qualifier Summary 12
Certifications 13
Chain of Custody/Sample Receipt 15
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