FA-1286_24238_CA_LTRRPT_20220107

Terracon Consultants, Inc. 2401 Brentwood Road, Suite 107 Raleigh, NC 27604
P [919] 873 2211 F [919] 873 9555 terracon.com
January 7, 2022
Mr. Mark Petermann
North Carolina Department Environmental Quality
Division of Waste Management
1646 Mail Service Center
Raleigh, North Carolina 27699-1646
Email:[e-mail]
Re: Injection Performance Monitoring Letter Report
Blalock Fina
3574 NC Highway 55
Angier, Harnett County, North Carolina
UST Incident Number: 24238
UST Number: FA-1286
Terracon Project No. 70149672B
Dear Mr. Petermann:
Terracon Consultants, Inc. (Terracon) is pleased to submit this injection performance monitoring
letter report for the above-referenced property. This report has been prepared in general accordance
with North Carolina Department of Environmental Quality (NCDEQ), Underground Storage Tank
(UST) Section Assessment Guidelines and Corrective Action Guidelines for Petroleum and
Hazardous Substance UST Releases / Petroleum Non-UST Releases,dated January 19, 2021, and
Task Authorization No. 02 approved on November 4, 2021. This report presents observations and
data from a recent groundwater sampling event to monitor the performance and distribution of a
persulfate injection completed on the site in August 2021.
Project Information
The Blalock Fina site, located at 3574 NC Highway 55 in Angier, North Carolina (site), is 0.69 acres
(Figure 1). The property is vacant and consists of cleared land. The site formerly contained a
gasoline station and convenience store, which began operation in 1957. The gas station was
reportedly closed in 1989 and the underground storage tanks (USTs) were reportedly pumped dry
and filled with a sand/cement/water slurry. A release from the former on-site UST system was
discovered in February 2001, when laboratory analysis of soil samples collected following the
removal of the USTs revealed the presence of petroleum contaminants. A Site Plan is provided as
Figure 2.
Investigation activities conducted between 2002 and the present included installation of twelve
monitoring wells, two recovery wells, two vapor extraction wells, water supply well sampling, and a
mobile multi-phase extraction event in 2004. An injection event was conducted in July 2011 that
utilized chemical oxidation and oxygen-releasing compounds. The injectate consisted of a solution of
Blalock Fina
Angier, North Carolina
Terracon Project No. 70149672B
Incident No. 24238
January 7, 2022
Responsive ■Resourceful ■Reliable 2
18% persulfate and 2% PermOx Plus into two separate areas at the site including the former source
area on the north side of NC Highway 55 and a down-gradient area south of NC Highway 55 (Figure
2). During the injection, vacuum extraction was applied to extraction wells and monitoring wells to
remove contaminant mass, prevent groundwater mounding, and provide hydraulic control (Force
Environmental Service Company, LLC, 2011).
NCDEQ filed a Notice of Residual Petroleum (NRP) for soil and groundwater on December 9, 2016
prior to a sale of the property between Mr. Blalock and a new property owner. The NRP was filed
with the deed in Book 3462, Page 818-820.
From 2014 to the present, Terracon conducted groundwater and soil investigations at the site to
monitor the concentrations and extents of petroleum contamination. Due to the lack of plume
delineation to the southeast of MW-3, Terracon installed monitoring well MW-12 in October 2019
(Terracon, 2019). Historical groundwater analytical data is in Table 1.
In July and August 2021, Terracon completed a baseline groundwater sampling event of the
monitoring well network prior to a persulfate injection at the site. Between August 23 and 25, 2021,
Terracon completed the application of approximately 1,800 pounds of RemRx™ Controlled Release
Polymer (CRP) Persulfate and 900 pounds of instantaneous release persulfate in 18 soil borings up
to 18 feet below land surface to chemically enhance degradation of petroleum contaminants in
groundwater (Figure 3) (Terracon, 2021). RemRx™ CRP Persulfate was utilized to establish in-situ
chemical oxidation of the petroleum hydrocarbons by providing a sustained delivery of oxidizing
persulfate ions (S2O82–) and sulfate radicals (SO4• –). RemRx™ developed the sustained-release
process to reduce the potential for contaminant rebounding. Persulfate and the resulting sulfate
radical anions degrade fuel-related constituents using reduction/oxidation (REDOX) chemistry and do
not rely on the presence of naturally occurring or supplemental microbial bacteria.
Assessment Activities
Terracon personnel mobilized to the site on November 10 and 11, 2021 to collect field groundwater
parameters from fourteen monitoring wells (MW-1, MW-3 through MW-9, MW-11, MW-12, RW-1,
RW-2, VEW-1, and VEW-2). Samples were also collected from MW-3 through MW-6, MW-8, MW-
10, RW-1, VEW-1, and VEW-2 for analyses of injectant indicator ions (sulfate, total iron, and
persulfate) to evaluate the distribution and release of the CRP Persulfate in the shallow aquifer.
Terracon also collected a sample from an upgradient well (MW-10) to evaluate background
concentrations.
Prior to purging, Terracon gauged the depth to groundwater in the monitoring wells. Shallow
groundwater depths in November 2021 ranged from 4.30 to 12.30 feet below top of casing (bTOC).
The apparent direction of surficial groundwater flow was to the southwest based on the calculated
groundwater elevations. Current and historical groundwater elevation measurements are in Table 2.
Groundwater elevations from the November 2021 gauging event are depicted on Figure 4.
Photographs and field notes of Terracon’s site visit are provided in Appendix A.
Blalock Fina
Angier, North Carolina
Terracon Project No. 70149672B
Incident No. 24238
January 7, 2022
Responsive ■Resourceful ■Reliable 3
Prior to sampling, the wells were purged with a peristaltic pump using low flow sampling techniques
(i.e., <200 milliliters per minute) prior to sampling. Field parameters consisting of pH, temperature,
oxidation-reduction potential (ORP), dissolved oxygen, and conductivity were measured at each of
the well locations. After stabilization of pH and conductivity, Terracon collected each groundwater
samples directly into laboratory supplied containers at low flow rates.
The groundwater samples were placed in laboratory-supplied glassware, labeled, and stored in an
ice-packed cooler. The samples, along with chain-of-custody documentation, were delivered to
RemRx™ for analysis of sulfate, total iron, and persulfate using a colorimeter/spectrophotometer.
Groundwater field and analytical data from the baseline sampling event and this monitoring event are
summarized in Table 3.
Based on information obtained during the completion of the groundwater sampling activities,
Terracon provides the following findings and conclusions:
n Free product was not measured in the monitoring wells. Free product thicknesses have not been
measured in the monitoring wells since May 2012 (MW-5).
n The following summarizes the groundwater field parameters measured in the monitoring wells
from this event and comparisons to baseline average measurements:
o pH field measurements in the monitoring wells ranged from 4.59 to 6.53 and were on average
1.0 lower than the baseline sampling event.
o Conductivity measurements in the monitoring wells ranged from 33 to 682 microsiemens per
centimeter (μS/cm) and were on average approximately 70 μS/cm higher than the baseline
sampling event.
o Dissolved oxygen measurements in themonitoring wells ranged from 0.12 to 4.93 milligrams
per liter (mg/L) and were on average approximately 2.8 mg/L lower than the baseline
sampling event.
o ORP measurements in the nearer monitoring wells ranged from -77.5 to 360.3 millivolts (mV)
and were on average approximately 150 mV higher than the baseline sampling event.
n Analytical results of the injectant indicator samples are as follows:
o Sulfate concentrations ranged from 1 to 900 mg/L. The sulfate concentration in the
background monitoring well (MW-10) was 6 mg/L.
o Total iron concentrations ranged from non-detect to 102.48 mg/L. The total iron concentration
in MW-10 was 8.4 mg/L.
o Persulfate concentrations ranged from non-detect to 256.52 mg/L. The persulfate
concentration in MW-10 was 16.77 mg/L.
n Based on the injectant indicator ion analytical results, local spreading of the CRP persulfate is
indicated by higher average conductivity and ORP compared to the baseline sampling event and
higher sulfate and persulfate concentrations in some monitoring wells located nearer and
Blalock Fina
Angier, North Carolina
Terracon Project No. 70149672B
Incident No. 24238
January 7, 2022
Responsive ■Resourceful ■Reliable 4
immediately downgradient of the injectant borings. Additional monitoring events will aid in
interpreting field measurement and analytical trends
Based on the findings of this injection performance monitoring event, Terracon recommends
collecting quarterly measurements of groundwater field parameters (e.g. pH, conductivity, and
REDOX potential) to evaluate the distribution and release of the CRP Persulfate. In addition, semi-
annual groundwater monitoring events should be conducted to evaluate the effectiveness of the CRP
Persulfate in remediating petroleum contaminants in groundwater at the site. Groundwater samples
from the monitoring wells should be analyzed for VOCs and sulfate to evaluate the distribution and
release of the CRP Persulfate.
If you have any questions regarding this report or the assessment activities, please contact us at
[phone].
Sincerely,
Terracon Consultants, Inc.
Ethan C. Dinwiddie Justin L. Fabriziani, RSM
Staff Geologist Environmental Department Manager
Donald R. Malone, PE, RSM
Senior Environmental Engineer
Attachments: Figure 1 – Site Location Map
Figure 2 – Site Plan
Figure 3 – CRP Persulfate Application Boring Location Map
Figure 4 – Groundwater Elevation Map (November 2021)
Table 1 – Summary of Historical Groundwater Analytical Results
Table 2 – Monitoring Well Construction Information and Historical Groundwater
Elevations
Table 3 – Field Groundwater Quality Measurements and Injectant Indicator
Analytical Results
Appendix A – Photographs and Field Notes
Appendix B – Injectant Indicator Laboratory Analytical Results
Blalock Fina
Angier, North Carolina
Terracon Project No. 70149672B
Incident No. 24238
January 7, 2022
Responsive ■Resourceful ■Reliable 5
References
n Force Environmental Service Company, LLC, 2011. Blalock’s Fina, 3574 Hwy 55, Angier, NC
Incident #24238. October 9.
n NCDEQ, 2021a. Corrective Action Guidelines for Petroleum and Hazardous Substance UST
Releases / Petroleum Non-UST Releases, January 19.
n NCDEQ, 2021b. Assessment Guidelines for Petroleum and Hazardous Substance UST Releases
/ Petroleum Non-UST Releases, January 19.
n Terracon Consultants, Inc. (Terracon), 2019. Subsequent Monitoring Report, Blalock Fina, 3574
NC Highway 55, Angier, Harnett County, North Carolina. April 18.
n Terracon, 2021. Annual Monitoring Report, Blalock Fina, 3574 NC Highway 55, Angier, Harnett
County, North Carolina. September 24.

FIGURES
Copyright:© 2013 National Geographic Society, i-cubed
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DRM September 2020 2401 Brentwood Road, Suite 107 Raleigh, NC 27604Phone: [phone] Fax: [phone]
Site Location Map
Blalock Fina(Incident # 24238)3574 NC Highway 55Angier, Harnett County, North Carolina
USGS TOPOGRAPHIC MAPCOATS, NC 1997
1,000 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000500Feet
CONTOUR INTERVAL 10 FEET
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@A Monitoring Well
@?Vapor Extraction Well
Approximate Extent of Injections (2011)
Residence
Excavation Extent
Site Boundary
Parcel Boundary
Former Building
Data Sources:Well Locations - TerraconSite Boundary - Harnett County GIS
³Imagery - ESRI WMS
^_Blalock Fina(Incident # 24238)3574 NC Highway 55Angier, Harnett County, North Carolina
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MW-10
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N:\ENV_EH&S\Env\GIS - ENV\Projects\2014\70149672 - Blalock Fina State Lead\70149672B - TA-01\Fig11_CRP Borings_70149672B_TA-01.mxdCRP Persulfate ApplicationBoring Location MapProject No.
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&*Application Borings (August 2021)
@A Monitoring Well
@?Vapor Extraction WellExcavation Extent
Former BuildingSite Boundary
ResidenceHarnett County Parcel Boundary
Data Sources:Well and Boring Locations - TerraconSite Boundary - Harnett County GISImagery - NCOneMap³
^_Blalock Fina (Incident # 24238)3574 NC Highway 55Angier, Harnett County, North Carolina
0 40 8020 Feet
Figure
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Notes:Boring depth ranged from 15 to 18 feet below land surface.CRP Persulfate applied in borings from bottom of boring toapproximately 5 to 7 feet below land surface.
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@A Monitoring Well
@?Vapor Extraction WellGWElev_Nov21
Excavation ExtentSite BoundaryParcel BoundaryFormer BuildingResidence
Notes:Arbitrary datum set at 100 ft on MW-1Data Sources:Well Locations - TerraconSite Boundary - Harnett County GISImagery - ESRI WMS³
^_Blalock Fina (Incident # 24238)3574 NC Highway 55Angier, Harnett County, North Carolina
0 40 8020 Feet
MW-1091.84MW-489.59
MW-588.70
RW-190.10 MW-390.26VEW-186.88
VEW-286.81MW-985.85
MW-1183.44
MW-686.64
BarryGregoryResidence
BeckwithResidence
Grass
Grass
Cleared Land
NC Highway 55
88.00
Estimated Groundwater Flow Direction
Groundwater Elevation (ft)89.01
MW-1290.99
86.00
90.00
84.00Notes:Depth to groundwater measured on November 10 and 11, 2021.Elevations based on an arbitary datum of 100.00 feet set on MW-1.
RW-290.09
MW-884.87
MW-788.46
MW-190.80

TABLES
Table 1Summary of Historical Groundwater Analytical Results
Blalock Fina (Incident #24238)
3574 NC Highway 55, Angier, North Carolina
Terracon Project Number: 70149672B
Well/Sample
I.D.Date Collected (mm/dd/yy)
1 70 70 3,000 70 3 0.02 0.4 0.4 70 600 70 25 20 6 70 70 0.2 600 400 400 5005,000 5,900 8,800 NE 70,000 3,000 50 400 400 70,000 80,000 30,500 11,700 20,000 6,000 26,100 70,000 200 260,000 24,100 28,500 50,0001.6 NE NE 19,000 3.6 220 0.18 2.2 21 1,400 3.5 180 NE 2,000 4.6 490 1,900 14 3,800 35 50 77
01/10/12 53.9 ND ND ---ND ---208 34.0 ND ND 184 94 ND -571 115 85.9 56905/17/12 9.6 ND ND ---ND ---124 7.41 ND ND 107 20.8 ND -147 41.5 172 33603/07/13 375 ND ND ---ND ---571 55.6 ND ND 313 104 6.8 -2,070 561 1,570 4,820
11/05/14 5.7 3.0 3.0 ---<0.50 <0.50 <0.50 <0.50 91.9 13.9 -<0.50 96.1 28.4 <0.50 <0.50 32 1.1 1 22
02/12/15 71 <2.5 3.0 ---<1.2 <1.2 <1.2 <1.2 288 29.7 -<1.2 174 68.6 1.2 J <1.2 149 51.8 242 60006/28/17 <0.50 <0.50 <0.50 -<0.50 -<0.50 <0.50 <0.50 <0.50 0.65 <0.50 <0.50 <0.50 <0.50 0.46 J <0.50 <0.50 0.82 <0.50 <0.50 <0.5001/16/18 0.98 3.6 2.2 0.42 J <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 84 9.2 0.88 <0.50 53 15 <0.50 <0.50 79 7.9 32 14603/04/19 13 7.9 3.6 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 220 14 <2.5 <2.5 88 41 <2.5 <2.5 140 11 66 187
10/18/19 1.3 3 2.4 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 72 7.9 0.77 <0.50 42 9.1 <0.50 <0.50 25 7.9 33 12705/04/20 65 30 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 520 29 5.1 <2.5 150 100 <2.5 <2.5 310 89 250 50008/04/21 10 H 33 H 8.1 H <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 470 28 H 6.0 H <5.0 180 H 100 <5.0 <5.0 500 150 H 500 H 1,090 H01/10/12 5,950 ND ND ---ND ---8,860 966 ND ND 4,500 3,900 ND -37,100 8,470 25,300 49,700
05/17/12 264 15.2 ND ---ND ---375 23.9 ND ND 182 81.4 ND -4,160 126 557 1,96403/07/13 1,670 <50 <50 ---ND ---1,430 82.3 ND ND 805 225 33.4 -8,540 810 2,980 13,05002/12/15 2,000 <25 <25 ---<25 <25 <25 <25 2,370 84.5 -<25 864 252 53.1 <25 17,800 588 2,430 12,36002/10/16 1,800 <100 <100 ---<100 <100 260 <100 1,900 74 J <100 <100 690 240 <100 <100 15,000 560 2,100 9,900
06/28/17 1,800 <100 <100 -<100 -<100 <100 <100 <100 2,700 93 J <100 <100 810 280 <100 <100 20,000 570 2,300 13,200
01/16/18 1,200 <25 <25 <25 <25 <25 <25 <25 <25 <25 2,700 95 <25 <25 740 340 150 <25 21,000 700 2,600 12,40003/04/19 890 <100 <100 <100 <100 <100 <100 <100 <100 <100 2,400 83 J <100 <100 650 260 <100 <100 16,000 590 2,200 11,60010/18/19 820 <100 <100 <100 <100 <100 <100 <100 <100 <100 2,900 99 J <100 <100 850 310 <100 <100 19,000 680 2,500 12,300
05/04/20 560 <100 <100 <100 <100 <100 <100 <100 <100 <100 2,600 85 J <100 <100 630 280 <100 <100 19,000 560 2,100 11,700
07/14/21 260 <50 <50 <50 <50 <50 <50 <50 <50 <50 2,200 74 <50 <50 580 220 <50 <50 11,000 460 1,700 9,900
03/07/13 ND ND ND ---ND ---ND ND ND ND ND ND ND -0.32 J ND 0.34 J 0.77 J11/05/14 <0.50 <0.50 <0.50 ---<0.50 <0.50 <0.50 <0.50 <0.50 <0.50 -<0.50 <2.0 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.0
02/12/15 <0.50 <0.50 <0.50 ---<0.50 <0.50 <0.50 <0.50 <0.50 <0.50 -<0.50 <2.0 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.0
02/10/16 <0.50 0.41 J 0.2 J ---<0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 0.18 J <0.50 <0.50 <0.50 <0.50 <0.50 <0.5006/29/17 <0.50 <0.50 <0.50 -<0.50 -<0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.5001/15/18 <0.50 <0.50 <0.50 <0.50 <0.50 0.79 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
03/04/19 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
05/04/20 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.5008/04/21 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.5001/10/12 2,850 ND ND ---23.5 ---812 67.5 ND 9.9 434 ND ND -7,990 338 1,230 4,870
11/05/14 829 <25 <25 ---<25 <25 <25 <25 649 32.1 -<25 289 106 <25 <25 4,820 236 851 3,480
02/12/15 953 <25 <25 ---<25 <25 <25 <25 1,060 49.3 -<25 317 154 <25 <25 6,420 279 1,090 5,35002/10/16 1,200 <100 <100 ---<100 <100 <100 <100 1,200 57 J <100 <100 340 170 <100 <100 9,000 320 1,200 5,50006/29/17 5,300 <10 11 <10 <10 -<10 <10 <10 <10 1,700 63 <10 <10 460 210 67 <10 12,000 390 1,200 5,40003/04/19 600 <50 <50 <50 <50 <50 <50 <50 <50 <50 1,200 63 <50 <50 350 200 <50 <50 3,900 270 650 2,600
10/18/19 640 34 <25 <25 <25 <25 <25 <25 <25 <25 1,100 41 <25 <25 270 150 <25 <25 3,000 150 270 1,05005/04/20 790 <50 <50 <50 <50 <50 <50 <50 <50 <50 1,400 57 <50 <50 330 200 <50 <50 7,600 290 810 2,58007/14/21 89 <5.0 4.3 J <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 290 19 <5.0 <5.0 100 67 <5.0 <5.0 820 120 230 41001/10/12
05/17/12 4,400 ND ND ---ND ---2,210 116 ND ND 930 ND ND -11,800 709 2,850 11,98003/07/13 2,820 ND ND ---ND ---2,180 125 ND ND 848 ND 32.6 J -10,500 814 3,040 13,16002/11/15 658 <5.0 <5.0 ---2.8 J <5.0 <5.0 <5.0 163 6.0 -<5.0 33.4 16.7 <5.0 <5.0 1,670 30.1 120 79202/10/16 47 <0.50 <0.50 ---<0.50 <0.50 <0.50 <0.50 6.2 <0.50 <0.50 <0.50 0.83 0.43 J <0.50 <0.50 67 1.2 3.4 27.2
06/28/17 820 <5.0 <5.0 -<5.0 -<5.0 <5.0 <5.0 <5.0 220 7.0 <5.0 <5.0 49 19 <5.0 <5.0 730 39 140 570
01/15/18 380 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 79 2.8 <2.5 <2.5 22 6.6 <2.5 <2.5 110 20 63 18103/04/19 220 <0.50 0.49 J <0.50 <0.50 <0.50 <0.50 5.2 <0.50 <0.50 130 4.3 <0.50 <0.50 33 13 <0.50 <0.50 280 18 46 22010/23/19 65 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 22 0.65 <0.50 <0.50 3.5 1.6 <0.50 <0.50 19 1.3 3.3 17.7
05/04/20 74 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 16 <0.50 <0.50 <0.50 1.3 0.72 <0.50 <0.50 80 1.2 4.2 29
07/14/21 5.0 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 5.6 <0.50 <0.50 <0.50 1.0 0.50 <0.50 <0.50 8.5 0.63 2.0 9.9
Notes:
Results in micrograms per liter (µg/L).NE - Not Established
Petroleum compounds detected in one or more samples are shown.J - estimated value below laboratory reporting limit and above method detection limit.
Gray shading denotes concentrations above 15A NCAC 2L groundwater standard (2L standard).H - Sample analyzed outside of holding time.
Yellow shading denotes concentrations above Gross Contamination Levels (GCLs).ND - Not detected
GW-VISL: NCDEQ DWM Groundwater Vapor Intrusion Screen Level, June 2021.'-' Indicates not analyzed
MW-1
MW-4
MW-3
MW-5
MW-6
Sample not collected due to free product in well 1,2,4-TrimethylbenzeneDiisopropyl Ether (IPE)EthylbenzeneIsopropylbenzeneToluene2L Standard (ug/L)Chloroformtrans-1,3-Dichloropropene1,2-Dibromoethane (EDB)1,2-DichloroethaneGross Contamination Level (GCL) (ug/L)Residential GW-VISL (ug/L)
Analytical Method VOCs via Method 6200B including MTBE, IPE, and EDB
Contaminant of Concern→Benzenen-Butylbenzenesec-ButylbenzeneChloromethanep-IsopropyltolueneMethyl tert-Butyl Ether(MTBE)Naphthalenen-PropylbenzeneChloroethaneXylenes, TotalStyrene1,1,2,2-Tetrachloroethane1,3,5-TrimethylbenzenePage 1 of 3
Table 1Summary of Historical Groundwater Analytical Results
Blalock Fina (Incident #24238)
3574 NC Highway 55, Angier, North Carolina
Terracon Project Number: 70149672B
Well/Sample
I.D.Date Collected (mm/dd/yy)
1 70 70 3,000 70 3 0.02 0.4 0.4 70 600 70 25 20 6 70 70 0.2 600 400 400 5005,000 5,900 8,800 NE 70,000 3,000 50 400 400 70,000 80,000 30,500 11,700 20,000 6,000 26,100 70,000 200 260,000 24,100 28,500 50,0001.6 NE NE 19,000 3.6 220 0.18 2.2 21 1,400 3.5 180 NE 2,000 4.6 490 1,900 14 3,800 35 50 771,2,4-TrimethylbenzeneDiisopropyl Ether (IPE)EthylbenzeneIsopropylbenzeneToluene2L Standard (ug/L)Chloroformtrans-1,3-Dichloropropene1,2-Dibromoethane (EDB)1,2-DichloroethaneGross Contamination Level (GCL) (ug/L)Residential GW-VISL (ug/L)
Analytical Method VOCs via Method 6200B including MTBE, IPE, and EDB
Contaminant of Concern→Benzenen-Butylbenzenesec-ButylbenzeneChloromethanep-IsopropyltolueneMethyl tert-Butyl Ether(MTBE)Naphthalenen-PropylbenzeneChloroethaneXylenes, TotalStyrene1,1,2,2-Tetrachloroethane1,3,5-Trimethylbenzene01/10/1205/17/12 0.54 ND ND ---ND ---5.7 0.87 ND ND 7.5 3.4 ND -10.3 9.4 33.1 4003/07/13 ND ND ND ---ND ---ND ND ND ND ND ND ND -ND ND 0.41 J ND
11/06/14 <0.50 <0.50 <0.50 ---<0.50 <0.50 <0.50 <0.50 1.5 1.0 -<0.50 1.0 J 1.5 <0.50 <0.50 0.46 J 7.5 20.9 <0.50
02/11/15 <0.50 <0.50 <0.50 ---<0.50 <0.50 <0.50 <0.50 7.0 2.7 -<0.50 3.3 6.2 <0.50 <0.50 1.9 22.5 58.9 32.002/10/16 <0.50 <0.50 0.53 ---<0.50 <0.50 <0.50 <0.50 4.6 2 <0.50 <0.50 1.3 4.4 <0.50 <0.50 1.7 16 35 21.906/27/17 <0.50 2.7 0.83 -0.50 -<0.50 <0.50 <0.50 <0.50 13 3.9 <0.50 <0.50 5.3 11 <0.50 <0.50 1.5 29 84 20.1
01/15/18 <0.50 1.5 0.42 J <0.50 <0.50 0.41 J <0.50 <0.50 <0.50 <0.50 13 3.2 <0.50 <0.50 8.2 8.9 <0.50 <0.50 3.3 14 80 24.1
03/04/19 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 0.65 0.46 J <0.50 <0.50 <0.50 1.6 3.8 0.7110/18/19 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 0.59 <0.50 <0.50 <0.50 <0.50 0.68 <0.50 <0.50 <0.50 2.3 5 1.805/04/20 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 1.9 <0.50 <0.50 <0.50 0.59 0.89 <0.50 <0.50 0.57 2.6 5.7 9.607/14/21 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 2.5 0.80 <0.50 <0.50 1.8 3.0 <0.50 <0.50 <0.50 8.4 20 11.501/10/12 ND ND ND ---ND ---ND ND ND ND ND ND ND -ND ND ND ND05/17/12 ND ND ND ---ND ---ND ND ND ND ND ND ND -ND ND ND ND
03/07/13 ND ND ND ---ND ---ND ND ND ND ND ND ND -ND ND ND ND
11/07/14 <0.50 <0.50 <0.50 ---<0.50 <0.50 <0.50 <0.50 <0.50 <0.50 -<0.50 <2.0 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.002/11/15 <0.50 <0.50 <0.50 ---<0.50 <0.50 <0.50 <0.50 <0.50 <0.50 -<0.50 <2.0 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.002/10/16 <0.50 <0.50 <0.50 ---<0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
06/28/17 <0.50 <0.50 <0.50 -<0.50 -<0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
01/15/18 0.43 J <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 0.53 <0.50 <0.50 4.9 <0.50 <0.50 <0.50 <0.50 4.6 3.8 6.003/04/19 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.010/23/19 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 4.9 <0.50 <0.50 <0.50 <0.50 3.1 <0.50 <0.50
05/04/20 0.69 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 0.47 J <0.50 <0.50 6.1 <0.50 <0.50 <0.50 <0.50 3.4 <0.50 <0.50
07/14/21 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 0.85 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
01/10/12 ND ND ND ---ND ---ND ND ND ND ND ND ND -ND ND ND ND
05/17/12 ND ND ND ---ND ---ND ND ND ND ND ND ND -ND ND ND ND
03/07/13 ND ND ND ---ND ---ND ND ND ND ND ND ND -ND ND ND ND11/07/14 <0.50 <0.50 <0.50 ---<0.50 <0.50 <0.50 <0.50 <0.50 <0.50 -<0.50 <2.0 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.002/11/15 <0.50 <0.50 <0.50 ---<0.50 <0.50 <0.50 <0.50 <0.50 <0.50 -<0.50 <2.0 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.0
02/10/16 <0.50 <0.50 <0.50 ---<0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
06/28/17 <0.50 <0.50 <0.50 -<0.50 -<0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.5003/04/19 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.010/23/19 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
05/04/20 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
07/14/21 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
01/10/12 ND ND ND ---ND ---ND ND ND ND ND ND ND -ND ND ND ND05/17/12 ND ND ND ---ND ---ND ND ND ND ND ND ND -ND ND ND ND03/07/13 ND ND ND ---ND ---ND ND ND ND ND ND ND -0.31 J ND 0.32 J 0.54 J11/07/14
03/04/19 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1.0
10/18/19 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 0.56 <0.50 <0.50 <0.5005/04/2008/04/21 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
01/10/12 12.9 5.7 ND ---ND ---ND 6.8 ND 2.1 35.1 19.4 ND -2.2 7.9 16.7 10.7
05/17/12 58.2 0.82 0.62 ---ND ---ND 2.5 ND 2.6 2.8 6.4 ND -1.7 2.3 ND 5.603/07/13 1.5 0.64 0.33 J ---ND ---ND 0.79 ND ND 3.4 2.0 ND -ND ND 0.48 J ND11/07/14 7.5 0.28 J 0.30 J ---<0.50 <0.50 <0.50 <0.50 7.9 1.6 -3.6 8.6 2.7 <0.50 <0.50 <0.50 <0.50 <0.50 <1.0
02/11/15 0.62 <0.50 <0.50 ---<0.50 <0.50 <0.50 <0.50 1.5 0.26 J -<0.50 <2.0 0.35 J <0.50 <0.50 <0.50 <0.50 <0.50 <1.0
02/10/16 <0.50 <0.50 <0.50 ---<0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.5006/29/1701/15/18 11 <0.50 1.1 <0.50 <0.50 0.71 <0.50 <0.50 <0.50 <0.50 15 5.2 0.76 <0.50 7.2 4.0 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
10/23/19 4.0 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 0.94 <0.50 <0.50 <0.50 0.45 J <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
05/04/20 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
07/14/21 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
10/23/19 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.5005/04/20 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.5007/14/21 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
Notes:
Results in micrograms per liter (µg/L).NE - Not Established
Petroleum compounds detected in one or more samples are shown.J - estimated value below laboratory reporting limit and above method detection limit.
Gray shading denotes concentrations above 15A NCAC 2L groundwater standard (2L standard).H - Sample analyzed outside of holding time.
Yellow shading denotes concentrations above Gross Contamination Levels (GCLs).ND - Not detected
GW-VISL: NCDEQ DWM Groundwater Vapor Intrusion Screen Level, June 2021.'-' Indicates not analyzed
Well not found
MW-12
MW-9
MW-7
MW-8
Sample not collected due to well being dry
MW-11
MW-10 Well not sampled since March 2013; well was assumed to be destroyed
Well not sampled
Page 2 of 3
Table 1Summary of Historical Groundwater Analytical Results
Blalock Fina (Incident #24238)
3574 NC Highway 55, Angier, North Carolina
Terracon Project Number: 70149672B
Well/Sample
I.D.Date Collected (mm/dd/yy)
1 70 70 3,000 70 3 0.02 0.4 0.4 70 600 70 25 20 6 70 70 0.2 600 400 400 5005,000 5,900 8,800 NE 70,000 3,000 50 400 400 70,000 80,000 30,500 11,700 20,000 6,000 26,100 70,000 200 260,000 24,100 28,500 50,0001.6 NE NE 19,000 3.6 220 0.18 2.2 21 1,400 3.5 180 NE 2,000 4.6 490 1,900 14 3,800 35 50 771,2,4-TrimethylbenzeneDiisopropyl Ether (IPE)EthylbenzeneIsopropylbenzeneToluene2L Standard (ug/L)Chloroformtrans-1,3-Dichloropropene1,2-Dibromoethane (EDB)1,2-DichloroethaneGross Contamination Level (GCL) (ug/L)Residential GW-VISL (ug/L)
Analytical Method VOCs via Method 6200B including MTBE, IPE, and EDB
Contaminant of Concern→Benzenen-Butylbenzenesec-ButylbenzeneChloromethanep-IsopropyltolueneMethyl tert-Butyl Ether(MTBE)Naphthalenen-PropylbenzeneChloroethaneXylenes, TotalStyrene1,1,2,2-Tetrachloroethane1,3,5-Trimethylbenzene01/10/1205/17/12 89.8 ND ND ---ND ---201 10.6 ND ND 150 24.2 ND -222 168 374 88503/07/13 466 ND ND ---ND ---771 48.3 ND ND 401 91.8 8.8 J -2,820 629 1,900 5,950
11/05/14 2.7 <0.50 0.80 ---<0.50 <0.50 <0.50 <0.50 0.67 0.6 -<0.50 6.7 <0.50 <0.50 <0.50 0.45 J 19 <0.50 0.27 J
02/12/15 46.1 <0.50 0.90 ---<0.50 <0.50 <0.50 <0.50 0.71 0.66 -<0.50 <2.0 0.62 <0.50 <0.50 3.3 8.3 <0.50 <1.002/10/16 34 <0.50 1.1 ---<0.50 <0.50 <0.50 <0.50 0.89 1 1.5 <0.50 12 0.55 <0.50 <0.50 0.46 J <0.50 <0.50 <0.5006/28/17 1.6 1.3 1.1 -<0.50 -<0.50 <0.50 <0.50 <0.50 0.67 0.44 J <0.50 <0.50 1.4 <0.50 <0.50 <0.50 1.5 <0.50 <0.50 0.62
01/16/18 4.0 <0.50 1.3 0.68 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 34 2.7 <0.50 <0.50 16 3.3 <0.50 <0.50 1.1 0.75 2.4 10.4
03/04/19 230 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 59 5.8 <2.5 <2.5 6.8 <2.5 <2.5 <2.5 2.8 <2.5 <2.5 3.010/18/19 25 <0.50 0.53 <0.50 <0.50 <0.50 <0.50 0.74 <0.50 <0.50 7.1 1.9 <0.50 <0.50 9.4 1.4 <0.50 <0.50 0.65 1.5 5.3 6.105/04/20 34 <0.50 2.4 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 1.4 1.4 <0.50 <0.50 24 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 0.41 J07/14/21 13 <0.50 2.7 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 0.94 <0.50 <0.50 9.4 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.5001/10/1205/17/12 458 ND ND ---ND ---848 64.8 ND ND 675 170 ND -5,860 617 2,450 8,910
03/07/13 416 ND ND ---ND ---1,330 99.7 ND ND 884 261 ND -7,910 1,020 3,520 12,650
11/05/14 423 <25 <25 ---<25 <25 <25 <25 704 31.9 -<25 403 99.1 14.2 J <25 4,550 272 758 3,26002/12/15 768 <25 <25 ---<25 <25 <25 <25 1,510 66.6 -<25 510 198 32.5 <25 8,990 468 1,410 7,16002/10/16 530 <50 <50 ---<50 <50 <50 <50 1,800 73 <50 <50 520 220 <50 <50 9,500 510 1,600 8,500
06/28/17 450 <50 <50 -<50 -<50 <50 <50 <50 1,500 58 <50 <50 520 160 <50 <50 7,500 380 1,500 8,800
01/16/18 220 <2.5 5.1 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 <2.5 990 41 <2.5 <2.5 320 120 60 <2.5 4,300 300 1,100 5,60003/04/19 390 <50 <50 <50 <50 <50 <50 <50 <50 <50 2400 84 <50 <50 660 250 <50 <50 7,900 500 1,900 9,60010/18/19 210 <25 <25 <25 <25 <25 <25 <25 <25 <25 680 31 <25 <25 230 94 <25 <25 4,400 240 890 3,600
05/04/20 660 <100 <100 <100 <100 <100 <100 <100 <100 <100 2,400 82 J <100 <100 630 240 <100 <100 11,000 530 2,000 12,600
07/14/21 350 <25 <25 <25 <25 <25 <25 <25 <25 <25 470 <25 <25 <25 170 52 <25 <25 3,800 140 500 2,900
01/10/12 1,210 ND ND ---1.6 ---733 36.6 ND 2.4 198 94.9 ND -3,450 195 715 3,720
05/17/12 1,260 15.6 ND ---2.1 ---1,180 48.9 ND 2.7 337 134 ND -4,670 133 961 5,270
03/07/13 1,120 ND 35.0 ---ND ---908 53.2 ND ND 438 138 14.3 -2,110 359 857 2,87711/06/14 2,670 <12.5 <12.5 ---<12.5 <12.5 <12.5 <12.5 1,170 46.1 -<12.5 519 152 <12.5 <12.5 512 307 348 17702/11/15 2,830 <10 <10 ---<10 <10 <10 <10 1,440 62.1 -<10 555 173 22.3 <10 3,330 392 975 1,746
02/10/16 2,700 <50 <50 ---<50 <50 <50 <50 1,800 64 <50 <50 520 190 <50 <50 4,200 390 800 2,200
06/28/17 1,300 41 <25 -<25 -<25 <25 <25 <25 1,700 75 <25 <25 630 220 <25 <25 3,700 460 1,300 2,09001/15/18 2,000 <10 12 <10 <10 <10 <10 <10 <10 <10 2,300 86 <10 <10 670 290 77 <10 10,000 540 1,800 7,40003/04/19 1,300 <50 <50 <50 <50 <50 <50 <50 <50 <50 2,500 88 <50 <50 700 270 <50 <50 6,100 450 1,500 5,400
10/23/19 1,200 <50 <50 <50 <50 <50 <50 <50 <50 <50 1,900 74 <50 <50 690 230 <50 <50 4,100 370 1,300 3,390
05/04/20 1,200 <50 <50 <50 <50 <50 <50 <50 <50 <50 2,200 81 <50 <50 560 250 <50 <50 5,700 430 1,500 5,00007/14/21 470 22 7.6 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 1,400 61 4.5 J <5.0 510 190 <5.0 <5.0 1,000 130 520 1,09001/10/12 7.4 ND ND ---ND ---229 17.4 ND ND 106 38.6 1.9 -5.6 127 179 82.305/17/12 37.5 ND ND ---ND ---99 10.4 ND ND 142 26.6 ND -6.3 64.9 106 42.503/07/13 14.9 ND ND ---ND ---30.7 3.3 ND ND 116 7.4 0.72 -7.5 16.3 5.7 20.9
11/06/14 40.7 <1.2 2.6 ---<1.2 <1.2 <1.2 <1.2 208 16.8 -<1.2 179 42 <1.2 <1.2 105 86.4 132 455
02/11/15 26.2 <0.50 <0.50 ---<0.50 <0.50 <0.50 <0.50 73.7 8.4 -<0.50 97.8 14.8 <0.50 <0.50 10.9 46.6 16.3 58.702/10/16 28 <0.50 0.75 ---<0.50 <0.50 <0.50 <0.50 36 3.8 0.51 <0.50 30 6.7 <0.50 0.49 J 1.1 17 1.6 7.106/28/17 14 1.0 0.49 J -<0.50 -<0.50 <0.50 <0.50 <0.50 32 2.6 <0.50 <0.50 17 5.1 <0.50 <0.50 <0.50 0.55 6.7 1.98
01/15/18 14 <0.50 0.5 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 14 2.5 <0.50 <0.50 16 3.0 <0.50 <0.50 <0.50 11 <0.50 <0.50
03/04/19 40 <0.50 1.2 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 14 5.6 0.67 <0.50 36 2.9 <0.50 <0.50 1.0 34 <0.50 <0.5010/23/19 16 1.4 1.3 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 21 5.5 0.74 <0.50 24 7.6 <0.50 <0.50 <0.50 22 1.1 0.6805/04/20 3.4 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 0.93 <0.50 <0.50 <0.50 1.9 <0.50 <0.50 <0.50 <0.50 0.48 J <0.50 <0.50
07/14/21 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 0.77 <0.50 <0.50 <0.50 0.83 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50
Pond 01/16/18 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50Notes:
Results in micrograms per liter (µg/L).NE - Not Established
Petroleum compounds detected in one or more samples are shown.J - estimated value below laboratory reporting limit and above method detection limit.
Gray shading denotes concentrations above 15A NCAC 2L groundwater standard (2L standard).H - Sample analyzed outside of holding time.
Yellow shading denotes concentrations above Gross Contamination Levels (GCLs).ND - Not detected
GW-VISL: NCDEQ DWM Groundwater Vapor Intrusion Screen Level, June 2021.'-' Indicates not analyzed
Sample not collected due to well being dry
Sample not collected due to well being dry
RW-1
RW-2
VEW-2
VEW-1
Page 3 of 3
Table 2
Monitoring Well Construction Information and Historical Groundwater Elevations
Blalock Fina (Incident #24238)
3574 NC Highway 55, Angier, North Carolina
Terracon Project Number: 70149672B
Well ID Date Water Level
Measured
Well Casing Depth
(ft. BGS)
Screened Interval
(x to y ft. BGS)Bottom of Well4
(ft. BGS)
Top of Casing
Elevation (ft.)
Depth to Water
from Top of
Casing (ft.)
Free Product
Thickness (ft.)
Groundwater
Elevation (ft.)Comments
11/05/14 6.87 --93.13
02/11/15 4.59 --95.41
02/10/16 3.20 --96.80
06/28/17 7.11 --92.89
01/16/18 9.67 --90.33
03/04/19 2.91 --97.09
10/18/19 8.99 --91.01
05/04/20 6.08 --93.92
08/04/21 6.20 --93.80
11/10/21 9.20 --90.80
11/05/14 5.95 --92.61
02/11/15 4.04 --94.52
02/10/16 3.13 --95.43
06/28/17 5.99 --92.57
01/16/18 8.49 --90.07
03/04/19 3.06 --95.50
10/18/19 7.57 --90.99
05/04/20 5.53 --93.03
07/14/21 7.30 --91.26
11/10/21 8.30 --90.26
11/05/14 7.50 --92.09
02/11/15 5.16 --94.43
02/10/16 3.89 --95.70
06/29/17 7.31 --92.28
01/15/18 10.26 --89.33
03/04/19 3.15 --96.44
10/18/19 9.02 --90.57
05/04/20 6.85 --92.74
08/04/21 6.65 --92.94
11/10/21 10.00 --89.59
11/05/14 7.20 --90.50
02/11/15 5.04 --92.66
02/10/16 4.27 --93.43
06/29/17 6.44 --91.26
01/15/18 9.08 --88.62
03/04/19 4.12 --93.58
10/18/19 7.85 --89.85
05/04/20 6.19 --91.51
07/14/21 6.00 --91.70
11/10/21 9.00 --88.70
11/05/14 5.58 --87.61
02/11/15 4.83 --88.36
02/10/16 4.02 --89.17
06/28/17 5.12 --88.07
01/15/16 6.21 --86.98
03/04/19 3.82 --89.37
10/23/19 5.76 --87.43
05/04/20 4.90 --88.29
07/14/21 5.93 --87.26
11/11/21 6.55 --86.64
11/05/14 7.12 --90.44
02/11/15 5.34 --92.22
02/10/16 4.77 --92.79
06/29/17 6.69 --90.87
01/15/18 9.21 --88.35
03/04/19 4.16 --93.40
10/18/19 7.69 --89.87
05/04/20 6.33 --91.23
07/14/21 6.75 --90.81
11/10/21 9.10 --88.46
11/05/14 7.65 --86.12
02/11/15 7.26 --86.51
02/10/16 4.76 --89.01
06/28/17 7.53 --86.24
01/15/18 8.03 --85.74
03/04/19 4.91 --88.86
10/23/19 7.59 --86.18
05/04/20 7.33 --86.44
07/14/21 7.25 --86.52
11/11/21 8.90 --84.87
Notes:
1. "-" indicates measureable amounts of free product were not detected
2. Bottom of well measurements are approximate and based off of field measurements; exact well construction data is unknown
3. BGS = below ground surface
4. Elevation is based on arbitrary datum set at 100.00 feet on the top-of-casing of MW-1.
MW-8 4.0 4-12 13.0 93.77
11.05-105.0 2-inch
Type II
97.56 2-inch
Type II
2-inch
Type II
MW-5 2.5 2.5-12.5 13.0 97.70
MW-6
MW-7 4.0 4-11 11.0
2-inch
Type II
93.19
MW-4 8.5 8.5-18 18.0 99.59
MW-1 8.0 8-18.5 18.0
MW-3 8.0 8-18 18.0
100.00 2-inch
Type II
98.56 2-inch
Type II
2-inch
Type II
Page 1 of 2
Table 2
Monitoring Well Construction Information and Historical Groundwater Elevations
Blalock Fina (Incident #24238)
3574 NC Highway 55, Angier, North Carolina
Terracon Project Number: 70149672B
Well ID Date Water Level
Measured
Well Casing Depth
(ft. BGS)
Screened Interval
(x to y ft. BGS)Bottom of Well4
(ft. BGS)
Top of Casing
Elevation (ft.)
Depth to Water
from Top of
Casing (ft.)
Free Product
Thickness (ft.)
Groundwater
Elevation (ft.)Comments
11/05/14 3.61 --86.54
02/11/15 3.27 --86.88
02/10/16 2.70 --87.45
06/28/17 3.36 --86.79
01/15/18 3.98 --86.17
03/04/19 2.56 --87.59
10/23/19 3.25 --86.90
05/04/20 3.20 --86.95
07/14/21 3.10 --87.05
11/10/21 4.30 --85.85
03/04/19 3.54 --100.60
10/18/19 11.67 --92.47
08/04/21 9.02 --95.12
11/10/21 12.3 --91.84
11/05/14 5.01 --83.78
02/11/15 4.35 --84.44
02/10/16 3.46 --85.33
06/28/17 Not Found ---
01/15/18 4.97 --83.82
03/04/19 3.64 --85.15
10/23/19 4.61 --84.18
05/04/20 4.33 --84.46
07/14/21 4.23 --84.56
11/10/21 5.35 83.44
10/23/19 8.09 --90.25
05/04/20 4.13 --94.21
07/14/21 4.95 --93.39
11/11/21 7.35 --90.99
11/05/14 5.69 --92.71
02/11/15 3.66 --94.74
02/10/16 2.85 --95.55
06/28/17 5.83 --92.57
01/16/18 8.41 --89.99
03/04/19 2.70 --95.70
10/18/19 7.44 --90.96
05/04/20 5.31 --93.09
07/14/21 6.01 --92.39
11/10/21 8.30 --90.10
11/05/14 5.46 --92.43
02/11/15 3.57 --94.32
02/10/16 2.75 --95.14
06/28/17 5.41 --92.48
01/16/18 7.83 --90.06
03/04/19 2.71 --95.18
10/18/19 6.95 --90.94
05/04/20 4.99 --92.90
07/14/21 5.75 --92.14
11/10/21 7.80 --90.09
11/05/14 9.08 --88.10
02/11/15 8.21 --88.97
02/10/16 7.38 --89.80
06/28/17 8.61 --88.57
01/15/18 9.89 --87.29
03/04/19 7.36 --89.82
10/23/19 9.04 --88.14
05/04/20 8.40 --88.78
07/14/21 8.57 --88.61
11/11/21 10.30 --86.88
11/05/14 9.64 --87.77
02/11/15 8.81 --88.60
02/10/16 8.13 --89.28
06/28/17 9.17 --88.24
01/15/18 10.38 --87.03
03/04/19 7.92 --89.49
10/23/19 9.29 --88.12
05/04/20 8.88 --88.53
07/14/21 9.98 --87.43
11/10/21 10.60 --86.81
Notes:
1. "-" indicates measureable amounts of free product were not detected
2. Bottom of well measurements are approximate and based off of field measurements; exact well construction data is unknown
3. BGS = below ground surface
4. Elevation is based on arbitrary datum set at 100.00 feet on the top-of-casing of MW-1.
97.18 2-inch
Type II
VEW-2 8.0 8-18 97.4118.0 2-inch
Type II
VEW-1 Unknown Unknown 18.0
98.40 2-inch
Type II
RW-2 5.0 5-10 10.0 97.89 2-inch
Type II
RW-1 5.0 5-10 10.0
MW-12 4.0 4-14 14.0 98.34
MW-11 2.0 2-12 13.0 88.79
MW-9
MW-10 5.0 5-15 15.0
2.0 2-7 7.0 90.15 2-inch
Type II
2-inch
Type II
104.14 2-inch
Type II
2-inch
Type II
Page 2 of 2
Well ID Date Temperature
(°C)pH Conductivity
(μS/cm)
DO
(mg/L)
ORP
(mV)
Sulfate
(mg/L)
Total Iron
(mg/L)
Persulfate
(mg/L)
08/04/21 19.92 9.57 120 0.57 -103.1 ------
11/10/21 21.02 6.04 145 0.17 18.0 ------
07/14/21 23.46 6.52 353 3.00 -281.3 ------
11/10/21 22.59 6.53 433 0.20 -36.5 56 0.33 ND
08/04/21 24.32 7.92 209 7.56 -34.4 ------
11/10/21 21.45 4.59 480 0.68 360.3 450 ND 256.52
07/14/21 23.99 5.67 90 3.21 -274.5 ------
11/10/21 23.25 5.50 682 0.15 -77.5 900 102.48 176.91
07/14/21 24.11 6.29 64 1.91 137.4 ------
11/11/21 20.97 6.20 362 0.31 -63.1 135 9.68 34.7
07/14/21 22.53 4.74 58 4.62 -240.6 ------
11/10/21 22.33 4.97 46 2.30 136.0 ------
07/14/21 21.78 7.04 218 0.76 131.0 ------
11/11/21 19.46 5.34 182 4.93 160.8 65 0.92 1.33
07/14/21 22.30 6.08 42 1.87 139.3 ------
11/11/21 19.29 4.99 33 1.97 198.8 ------
08/04/21 22.05 8.45 25 4.95 -52.6 ------
11/10/21 21.25 5.43 39 0.71 163.7 6 8.4 16.77
07/14/21 21.55 6.61 105 2.12 135.2 ------
11/11/21 20.55 5.95 326 0.29 10.1 ------
07/14/21 23.60 4.54 48 7.29 -182.9 ------
11/10/21 22.70 4.70 39 4.82 267.7 ------
07/14/21 22.58 6.20 537 2.86 -265.3 ------
11/10/21 23.26 6.18 305 0.56 -31.6 10 8.25 10.99
07/14/21 24.45 5.97 114 2.80 -281.2 ------
11/10/21 22.27 5.94 149 0.12 -47.4 ------
07/14/21 22.81 7.39 587 0.59 -86.2 ------
11/11/21 21.89 6.50 415 0.52 -59.1 1 0.222 3.29
07/14/21 22.41 6.22 109 2.26 127.0 ------
11/11/21 22.44 5.24 86 1.48 161.2 26 ND ND
22.79 6.61 178.60 3.09 -75.5 ------
21.65 5.61 248.13 1.28 77.4 183 14 56
Notes:
°C - degrees Celsius. μS/cm - microSiemens per centimeter.
mV - millivolts.DO - dissolved oxygen.
mg/L - milligrams per liter.ND - Non-detect
ORP - oxidation-reduction potential.-- : Not analyzed
MW-4
MW-3
MW-1
Averages from July
and August 2021
Averages from
November 2021
Table 3
Field Groundwater Quality Measurements and Injectant Indicator Analytical Results
Blalock Fina (Incident #24238)
3574 NC Highway 55, Angier, North Carolina
Terracon Project Number: 70149672B
MW-10
MW-9
MW-8
MW-7
MW-6
MW-5
VEW-2
VEW-1
RW-2
RW-1
MW-12
MW-11
Page 1 of 1

APPENDIX A
PHOTOGRAPHS AND FIELD NOTES

Injection Performance Monitoring Event
Blalock Fina (Incident #24238)■Angier, North Carolina
Photos Taken: November 2021 ■Terracon Project No. 70149672B
Photo #1 View of the site; facing northwest.Photo #2 View of MW-1; facing west.
Photo #3 View of MW-3; facing southeast.Photo #4 View of MW-4; facing north.
Photo #5 View of MW-5; facing southeast.Photo #6 View of MW-6; facing east.
Injection Performance Monitoring Event
Blalock Fina (Incident #24238)■Angier, North Carolina
Photos Taken: November 2021 ■Terracon Project No. 70149672B
Photo #7 View of MW-7; facing northeast.Photo #8 View of MW-8; facing west.
Photo #9 View of MW-9; facing northeast.Photo #10 View of MW-10; facing northeast.
Photo #11 View of MW-11; facing northwest.Photo #12 View of MW-12; facing southeast.
Injection Performance Monitoring Event
Blalock Fina (Incident #24238)■Angier, North Carolina
Photos Taken: November 2021 ■Terracon Project No. 70149672B
Photo #13 View of VEW-1; facing east.Photo #14 View of VEW-2; facing east.
Photo #15 View of RW-1; facing southwest.Photo #16 View of RW-2.

APPENDIX B
INJECTANT INDICATOR
LABORATORY ANALYTICAL RESULTS

2901 East Gate City Blvd, Suite 2200 │ Greensboro, NC 27401 │ 336-217-5171
www.remrxremediation.com 1
Ethan Dinwiddie, GIT Terracon Consultants 241 Brentwood Road, Suite 107
Raleigh, NC 27604
[phone]

December 18, 2021

RE: Blalock Fina November 2021 Sample Results

Dear Mr. Dinwiddie:
The RemRx team is submitting this letter to document the results of sulfate, total iron, and persulfate measurements at the Blalock Fina (site). Please find summary of the methodology and results below.
Methodology
Sulfate. Sulfate (SO42-) measurements were made using the Hach USEPA SulfaVer 4 Method. This method precipitates the sulfate present in solution as barium sulfate. The absorbance of the turbid solution at 450 nm is then correlated to the sulfate concentration. Some chemical constituents will interfere with this
method, including high concentrations of barium, calcium, chloride, magnesium, and silica.
Iron. Iron (Fe) measurements were made using the Hach TPTZ method. The TPTZ Iron Reagent forms a
deep blue-purple color with ferrous iron (Fe2+), the concentration of which is measured with a
spectrophotometer at 590 nm. The indicator is combined with a reducing agent that converts precipitated
or suspended iron, such as rust, to the ferrous state. Therefore, all forms of iron are measured by this
method. Interfering substances include other metal ions, nitrite, and turbidity.
Persulfate. Persulfate (S2O82-) was measured using an assay that reacts potassium iodide with persulfate
to generate iodine/triiodide, which can then be measured using a spectrophotometer.
Table 1. Concentrations of Sulfate, Total Iron, and Persulfate.

Sample ID Sample Date Sulfate (mg/L) Total Iron (mg/L) Persulfate (mg/L)
MW3 11/10/2021 56 0.33 0
MW4 11/10/2021 450 0 256.52
MW5 11/10/2021 900 102.48 176.91
MW6 11/11/2021 135 9.68 34.7
MW8 11/11/2021 65 0.92 1.33
MW10 11/11/2021 6 8.4 16.77
VEW1 11/10/2021 1 0.222 3.29
VEW2 11/10/2021 26 0 0.
RW1 11/11/2021 10 8.25 10.99
Blalock Fina November 2021 Analytical Results
2901 East Gate City Blvd, Suite 2200 │ Greensboro, NC 27401 │ 336-217-5171
www.remrxremediation.com 2
The RemRx team appreciates the opportunity to assist in this analysis. If you have any questions, please feel free to contact us.

Sincerely,

Julia Darcy, PhD Jeff Albano, PG Research Scientist, Laboratory Lead Technical Services Manager [e-mail] [phone] [e-mail]

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