AS-3303_28466_CA_CAI_20170306_Performance 2

7606 Whitehall Executive Center Drive, Suite 800
Charlotte, NC 28273
Tel: [phone]
Fax: [phone]
www.atcgroupservices.com
N.C. Engineering License No. C-1598

1

March 6, 2017

Mr. Dan Murphy
North Carolina Department of Environmental Quality
Asheville Regional Office
Division of Waste Management - UST Section
2090 US Highway 70
Swannanoa, North Carolina 28778

Re: Corrective Action Performance Report
Former Tilley’s Superette
1710 Union Grove Road
Lenoir, North Carolina 28645
Facility ID No. 0-007680
NCDEQ Incident No. 28466
Site Risk: H155D
ATC Project No. CARTILL

Dear Mr. Murphy:

ATC Associates of North Carolina, P.C. (ATC), on behalf of Cary Oil Company (Cary Oil), is submitting a
Corrective Action Performance Report which summarizes Air Sparge/Soil Vapor Extraction (AS/SVE)
system operation and maintenance (O&M) activities conducted from November 2016 through January 2017.

As outlined in the August 2009 Corrective Action Plan, AS/SVE technologies were the chosen corrective
actions for this site based on site conditions and technical considerations. The AS/SVE wells were
installed from November 14 to November 22, 2011. The system components were delivered and installed
from December 2011 to March 2012. The system was started on April 24, 2012.

O&M site visits were conducted by ATC personnel on November 7, 2016, December 6, 2016, and January 3,
2017. The AS/SVE system achieved approximately 85% run-time from November 2016 through January
2017. Downtime was due to a power fault in December 2016. Vacuum readings for each well point at the
SVE manifold were set at approximately 49 inches of water during the reporting period. Soil vapor extraction
wells SVE-6 through SVE-8 have been off since April 8, 2013, to increase system vacuum in areas of highest
groundwater impact. Pressure readings for each well point at the AS manifold were set at approximately 12
psi. Air sparge wells AS-4 through AS-10 are currently turned off to direct system pressure to areas of
highest groundwater impact.

ATC collected an SVE influent air sample on December 6, 2016. The air sample was submitted to Prism
Laboratories, Inc. for analysis by EPA Method TO-18. The laboratory analytical report is provided in
Appendix A. Table 1 shows SVE cumulative recovery calculations based on system influent sampling data.
Assuming consistent recovery during each day of operation between sampling dates, approximately 3,374
pounds of total BTEX have been recovered since system startup.

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TABLES
Date
Cross-Sectional
Area of Pipe
Conversion
Factor3 Days of
Operation
Cumulative
Recovery
(ft2) (lb-m3/mg-ft3)(lb/hr) (lb/day) (days) (lbs)
06/20/12 0.08700 2,982 259.4 835.9 0.00000006243 0.8123 19.50 57.00 1,111
09/19/12 0.08700 3,433 298.7 367.0 0.00000006243 0.4106 9.85 91.00 2,008
12/19/12 * 0.08700 3,433 298.7 305.0 0.00000006243 0.3412 8.189 91.00 2,753
03/20/13 0.08700 2,260 196.6 90.50 0.00000006243 0.06665 1.600 91.00 2,899
06/26/13 0.08700 828.0 72.04 101.9 0.00000006243 0.02750 0.6599 98.00 2,963
09/28/13 * 0.08700 828.0 72.04 25.10 0.00000006243 0.006773 0.1625 94.00 2,979
12/30/13 * 0.08700 564.0 49.07 140.10 0.00000006243 0.02575 0.6180 93.00 3,036
03/11/14 * 0.08700 465.0 40.46 76.14 0.00000006243 0.01154 0.2769 71.00 3,056
06/17/14 0.08700 545.0 47.42 60.28 0.00000006243 0.01071 0.2569 98.00 3,081
09/08/14 0.08700 512.0 44.54 24.30 0.00000006243 0.004055 0.09731 83.00 3,089
01/07/15 0.08700 488.0 42.46 82.30 0.00000006243 0.01309 0.3141 121.0 3,127
03/04/15 0.08700 498.0 43.33 91.51 0.00000006243 0.01485 0.3564 56.00 3,147
06/18/15 0.08700 521.0 45.33 6.07 0.00000006243 0.001031 0.02473 106.0 3,150
10/29/15 0.08700 530.0 46.11 205.6 0.00000006243 0.03551 0.8523 133.0 3,263
12/22/15 * 0.08700 530.0 46.11 111.0 0.00000006243 0.01917 0.4601 54.00 3,288
03/31/16 0.08700 534.0 46.46 49.5 0.00000006243 0.00861 0.2065 100.00 3,309
06/29/16 0.08700 592.0 51.50 65.6 0.00000006243 0.01265 0.3035 90.00 3,336
09/29/16 0.08700 430.0 37.41 71.6 0.00000006243 0.01003 0.2408 92.00 3,358
12/06/16 0.08700 544.0 47.33 55.3 0.00000006243 0.0098 0.2353 68.00 3,374
Notes:
* Influent velocity inferred; reading not collected due to water in line
4. Mass removal rate = (air flow rate) x (total BTEX) x (conversion factor) x (60 min/hr or 1,440 min/day)
3. Conversion factor to convert units of concentration from mg/m3 to lb/ft3
Facility ID Number 0-007680
2. Total BTEX concentrations in influent air are based on EPA Method 18 laboratory data
Table 1
SVE System Cumulative Recovery
Former Tilley's Superette
1710 Union Grove Road
Lenoir, North Carolina
1. Air flow rate = (cross-sectional area) x (influent velocity)
Incident Number 28466
Influent
Velocity
(ft/min)
Air Flow
Rate1
(ft3/min)
Total
BTEX2
(mg/m3)
Mass Removal Rate4
Table 2
Depth to Water and Dissolved Oxygen Readings
Former Tilley's Superette
1710 Union Grove Road
Lenoir, North Carolina
Facility ID Number 0-007680
Incident Number 28466
DTW DO DTW DO DTW DO DTW DO DTW DO DTW DO DTW DO DTW DO DTW DO DTW DO DTW DO DTW DO
(ft below
TOC)(mg/L)(ft below
TOC)(mg/L)(ft below
TOC)(mg/L)(ft below
TOC)(mg/L)(ft below
TOC)(mg/L)(ft below
TOC)(mg/L)(ft below
TOC)(mg/L)(ft below
TOC)(mg/L)(ft below
TOC)(mg/L)(ft below
TOC)(mg/L)(ft below
TOC)(mg/L)(ft below
TOC)(mg/L)
MW-1 40.90 8.11 40.20 7.69 40.08 8.68 40.22 6.29 42.26 3.22 35.12 7.92 34.62 8.71 34.99 2.02 37.36 8.40 38.27 3.93 36.21 2.09 35.68 3.23
MW-2 41.05 NR 40.38 1.46 40.14 2.82 40.21 1.49 41.98 2.26 35.23 3.53 34.68 6.03 34.58 7.15 36.92 3.01 37.68 3.97 35.87 2.37 34.86 2.92
MW-3 40.51 NR 39.88 4.12 39.59 5.46 39.52 2.53 41.91 2.07 34.91 8.29 34.28 8.97 34.50 6.01 37.03 4.91 37.92 4.04 35.96 4.32 35.16 2.26
MW-4 34.51 7.42 33.69 7.99 33.60 10.48 33.90 8.51 35.75 8.06 28.06 7.03 28.47 8.76 29.40 4.28 31.42 6.34 32.83 4.25 29.73 4.93 NM NM
MW-5D 41.38 8.58 40.64 1.33 40.50 1.68 40.76 2.46 42.58 2.08 35.23 2.47 34.98 5.51 35.57 4.82 37.64 3.19 38.64 3.78 36.35 2.82 35.98 9.14
MW-6 37.33 7.21 36.39 8.37 36.33 9.74 36.58 7.17 38.66 7.71 30.78 8.43 31.02 8.72 31.76 6.62 33.91 6.62 NM NM NM NM NM NM
MW-7 31.83 9.24 31.23 8.66 30.23 11.11 31.55 8.99 33.43 9.42 25.26 8.28 25.82 8.70 27.10 6.79 28.74 6.87 NM NM NM NM NM NM
MW-8 35.05 9.52 34.58 8.31 34.76 10.20 35.16 7.78 36.52 9.02 29.08 8.32 29.76 9.41 30.94 6.29 32.43 7.42 NM NM NM NM NM NM
MW-9 39.23 2.81 38.78 5.05 38.75 7.83 39.06 2.35 40.61 2.67 33.27 8.26 33.87 8.76 34.59 6.09 36.35 3.71 37.57 3.87 34.59 2.98 35.20 3.07
MW-10 41.53 5.83 41.13 6.60 40.80 7.58 40.84 6.60 42.53 6.93 36.18 8.22 37.59 7.38 35.07 6.91 37.81 5.67 NM NM NM NM NM NM
MW-11 40.80 9.14 40.11 4.11 39.82 4.22 39.81 2.89 41.85 2.06 35.32 6.96 34.47 8.34 34.30 4.05 36.98 3.85 37.81 4.25 NM NM NM NM
MW-12 39.23 5.62 39.02 8.12 39.05 6.88 39.38 4.38 40.91 2.28 33.88 8.25 34.56 8.42 35.47 3.89 37.09 1.99 38.28 4.68 35.20 3.41 36.00 3.08
MW-13 27.74 9.46 27.43 8.05 27.59 9.53 28.03 8.10 29.27 8.98 22.13 8.64 22.86 8.31 24.02 5.88 25.46 7.24 NM NM NM NM NM NM
MW-14 29.59 6.57 28.96 7.10 29.15 9.24 29.64 7.77 30.98 8.24 23.57 8.78 25.43 8.29 25.47 5.81 26.95 6.56 NM NM NM NM NM NM
MW-15 31.16 9.28 30.86 10.02 30.90 11.15 31.37 8.88 32.62 10.40 25.24 8.76 25.91 8.48 27.08 7.91 28.56 6.64 NM NM NM NM NM NM
MW-16D 39.74 5.99 39.40 1.70 41.00 2.90 39.86 1.64 41.20 1.65 34.06 5.98 34.80 9.37 35.75 2.31 37.30 2.61 38.72 3.26 35.33 4.00 36.30 2.85
MW-17 40.66 8.52 40.38 5.48 40.37 7.38 40.63 4.98 42.08 Dry 35.86 8.85 36.56 7.50 37.13 5.21 38.68 5.64 NM NM NM NM NM NM
MW-18 37.21 7.49 36.92 6.26 37.02 6.95 37.38 5.24 38.75 6.47 31.77 7.68 32.59 7.68 33.53 4.49 35.10 5.93 NM NM 33.29 7.44 34.05 7.56
MW-19 25.54 8.99 25.23 6.59 25.41 9.43 25.81 5.23 27.04 Dry 19.93 8.83 20.68 7.63 21.83 4.96 23.28 6.34 NM NM NM NM NM NM
MW-20 16.11 5.67 15.89 5.62 16.04 8.96 16.42 5.40 17.54 8.01 10.53 8.90 11.54 8.76 12.43 7.32 13.85 6.40 NM NM NM NM NM NM
TOC = top of casing
NR = not recorded (sheen observed)
NM = not measured
8/17/20168/14/20132/13/2013
Well ID
5/7/2012 6/6/2012 7/9/2012 8/8/2012 2/18/20168/19/20152/17-18/20158/14/20142/11/2014

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APPENDIX A