MO-5392_18748_G_WSW_20230127_PAYNEHRE

January 27, 2023
David Payne 523 Oates Road Gastonia, North Carolina 28052
Re: Health Risk Evaluation of Water Supply Tracking ID: Incident Number: 18748 Dear Mr. Payne: Please find attached the Sample Analytical Results for water samples collected from your well, identified as WSW-9, located at 523 Oates Road, Gastonia, Gaston County, on January 10, 2023. The samples were collected and analyzed as part of the investigation of a petroleum release in the vicinity. The water samples collected were analyzed for specific target analytes (contaminants), which are listed on the attached Sample Analytical Results.
Because contaminants were detected in the water sample, a Health Risk Evaluation of each water supply sample was performed by an environmental toxicologist in the Division of Waste Management. The Health Risk Evaluation, which is attached also, compares the detected concentration of contaminants to acceptable concentrations and provides a
recommendation for safe use of the water. If you have any questions, please contact David Lilley at [phone], or contact me at [phone].
Sincerely, Brad C. Newton, P.G. Hydrogeologist Mooresville Regional Office UST Section, Division of Waste Management, NCDEQ
Attachments: Payne Sample Analytical Results Health Risk Evaluation
cc: Gaston County Health Department Gaston County Manager Miguel Alvalle – IHSB (via e-mail)

January 27, 2023
TO: Brad Newton
Mooresville Regional Office NC UST Section RE: Health Risk Evaluation
Incident # 18748 Payne Well Sampling Results 523 Oates Road Gastonia, NC

During this sampling event, three contaminants were detected in the well water. The standards used to determine if the water is suitable for drinking and cooking are the United States Environmental Protection Agency’s Maximum Contaminant Levels (MCLs) or, if no MCLs exist, North Carolina Groundwater Standards (2L).

If any contaminant concentrations exceed applicable standards for using the water for drinking and cooking, those contaminant concentrations are further analyzed to determine if the water is suitable for other household uses, such as showering, bathing, washing dishes, flushing toilets, and hand washing. The chart below compares the detected contaminant concentrations with the applicable
standards:
Sample ID Contaminant Concentration (µg/L) MCL (µg/L) 2L (µg/L)
97288 Chloroform 0.488 80*
Ethanol 53.9 4,000*
Tetrachloroethene 0.458 5
µg/L – Stands for micrograms of contaminant per liter of water and is roughly equivalent to parts per
billion. * This value is an Interim Maximum Allowable Concentration (IMAC). RECOMMENDATION: None of the contaminants detected exceeded the applicable water
standards. Therefore, no restrictions on the use of this water are recommended at this time.
David Lilley, Environmental Toxicologist
Division of Waste Management, NCDEQ
,
REPORT OF ANALYSISReport Number :
Project
Information :
NC 28110
23-011-0100
00087
Geological Resources, Inc.
3502 Hayes Road
Scott Ball
Monroe
Danyale Love
Project Manager
GRI # 2451 Received : 01/11/2023
Gate 402
Report Date : 01/18/2023
Sample ID :
Lab No :
Sampled:WSW-9
97288 Matrix:
1/9/2023 12:50
Aqueous
Analytical Method:
Prep Method:
Test Results Units MDL MQL By Analytical
Batch
Date / Time
Analyzed
DF
6200 PT
6200B Prep Batch(es):V28979 01/17/23 14:00
<1.80 µg/L 1.80 10.0Acetone 1 01/18/23 07:34 V28980MSA
<0.180 µg/L 0.180 0.500Benzene 1 01/18/23 07:34 V28980MSA
<0.210 µg/L 0.210 0.500Bromobenzene 1 01/18/23 07:34 V28980MSA
<0.420 µg/L 0.420 1.00Bromochloromethane 1 01/18/23 07:34 V28980MSA
<0.160 µg/L 0.160 0.500Bromodichloromethane 1 01/18/23 07:34 V28980MSA
<1.50 µg/L 1.50 5.00Bromoform 1 01/18/23 07:34 V28980MSA
<0.280 µg/L 0.280 1.00Bromomethane 1 01/18/23 07:34 V28980MSA
<0.180 µg/L 0.180 0.500n-Butylbenzene 1 01/18/23 07:34 V28980MSA
<0.200 µg/L 0.200 0.500
sec-Butyl benzene 1 01/18/23 07:34 V28980MSA
<0.920 µg/L 0.920 2.00tert-Butyl benzene 1 01/18/23 07:34 V28980MSA
<0.180 µg/L 0.180 0.500Carbon Tetrachloride 1 01/18/23 07:34 V28980MSA
<0.190 µg/L 0.190 0.500Chlorobenzene 1 01/18/23 07:34 V28980MSA
<0.190 µg/L 0.190 0.500Chlorodibromomethane 1 01/18/23 07:34 V28980MSA
<0.430 µg/L 0.430 1.00Chloroethane 1 01/18/23 07:34 V28980MSA
0.488 J µg/L 0.220 0.500Chloroform 1 01/18/23 07:34 V28980MSA
<0.220 µg/L 0.220 0.500
Chloromethane 1 01/18/23 07:34 V28980MSA
<0.200 µg/L 0.200 0.5002-Chlorotoluene 1 01/18/23 07:34 V28980MSA
<0.200 µg/L 0.200 0.5004-Chlorotoluene 1 01/18/23 07:34 V28980MSA
<0.500 µg/L 0.500 0.500Di-Isopropyl Ether (DIPE)1 01/18/23 07:34 V28980MSA
<1.10 µg/L 1.10 2.001,2-Dibromo-3-Chloropropane 1 01/18/23 07:34 V28980MSA
<0.200 µg/L 0.200 0.5001,2-Dibromoethane 1 01/18/23 07:34 V28980MSA
<0.230 µg/L 0.230 0.500Dibromomethane 1 01/18/23 07:34 V28980MSA
Qualifiers/
Definitions
Estimated valueJDilution FactorDF
Method Quantitation LimitMQL
Page 10 of 29
,
REPORT OF ANALYSISReport Number :
Project
Information :
NC 28110
23-011-0100
00087
Geological Resources, Inc.
3502 Hayes Road
Scott Ball
Monroe
Danyale Love
Project Manager
GRI # 2451 Received : 01/11/2023
Gate 402
Report Date : 01/18/2023
Sample ID :
Lab No :
Sampled:WSW-9
97288 Matrix:
1/9/2023 12:50
Aqueous
Analytical Method:
Prep Method:
Test Results Units MDL MQL By Analytical
Batch
Date / Time
Analyzed
DF
6200 PT
6200B Prep Batch(es):V28979 01/17/23 14:00
<0.220 µg/L 0.220 0.5001,2-Dichlorobenzene 1 01/18/23 07:34 V28980MSA
<0.190 µg/L 0.190 0.5001,3-Dichlorobenzene 1 01/18/23 07:34 V28980MSA
<0.210 µg/L 0.210 0.5001,4-Dichlorobenzene 1 01/18/23 07:34 V28980MSA
<1.20 µg/L 1.20 5.00Dichlorodifluoromethane 1 01/18/23 07:34 V28980MSA
<0.240 µg/L 0.240 0.5001,1-Dichloroethane 1 01/18/23 07:34 V28980MSA
<0.150 µg/L 0.150 0.5001,2-Dichloroethane 1 01/18/23 07:34 V28980MSA
<0.150 µg/L 0.150 0.5001,1-Dichloroethene 1 01/18/23 07:34 V28980MSA
<0.200 µg/L 0.200 0.500cis-1,2-Dichloroethene 1 01/18/23 07:34 V28980MSA
<0.180 µg/L 0.180 0.500
trans-1,2-Dichloroethene 1 01/18/23 07:34 V28980MSA
<0.190 µg/L 0.190 0.5001,2-Dichloropropane 1 01/18/23 07:34 V28980MSA
<0.130 µg/L 0.130 0.5001,3-Dichloropropane 1 01/18/23 07:34 V28980MSA
<0.210 µg/L 0.210 2.002,2-Dichloropropane 1 01/18/23 07:34 V28980MSA
<0.200 µg/L 0.200 0.5001,1-Dichloropropene 1 01/18/23 07:34 V28980MSA
<0.210 µg/L 0.210 0.500cis-1,3-Dichloropropene 1 01/18/23 07:34 V28980MSA
<0.150 µg/L 0.150 0.500trans-1,3-Dichloropropene 1 01/18/23 07:34 V28980MSA
53.9 J
µg/L 42.0 200
Ethanol 1 01/18/23 07:34 V28980MSA
<0.170 µg/L 0.170 0.500Ethylbenzene 1 01/18/23 07:34 V28980MSA
<0.350 µg/L 0.350 3.00Hexachlorobutadiene 1 01/18/23 07:34 V28980MSA
<0.380 µg/L 0.380 1.002-Hexanone 1 01/18/23 07:34 V28980MSA
<0.180 µg/L 0.180 0.500Isopropylbenzene 1 01/18/23 07:34 V28980MSA
<0.089 µg/L 0.089 0.5004-Isopropyl toluene 1 01/18/23 07:34 V28980MSA
<0.710 µg/L 0.710 5.00Methyl Ethyl Ketone (MEK)1 01/18/23 07:34 V28980MSA
Qualifiers/
Definitions
Estimated valueJDilution FactorDF
Method Quantitation LimitMQL
Page 11 of 29
,
REPORT OF ANALYSISReport Number :
Project
Information :
NC 28110
23-011-0100
00087
Geological Resources, Inc.
3502 Hayes Road
Scott Ball
Monroe
Danyale Love
Project Manager
GRI # 2451 Received : 01/11/2023
Gate 402
Report Date : 01/18/2023
Sample ID :
Lab No :
Sampled:WSW-9
97288 Matrix:
1/9/2023 12:50
Aqueous
Analytical Method:
Prep Method:
Test Results Units MDL MQL By Analytical
Batch
Date / Time
Analyzed
DF
6200 PT
6200B Prep Batch(es):V28979 01/17/23 14:00
<0.140 µg/L 0.140 1.00Methyl tert-butyl ether (MTBE)1 01/18/23 07:34 V28980MSA
<0.078 µg/L 0.078 1.004-Methyl-2-Pentanone 1 01/18/23 07:34 V28980MSA
<0.330 µg/L 0.330 2.00Methylene Chloride 1 01/18/23 07:34 V28980MSA
<0.470 µg/L 0.470 1.00Naphthalene 1 01/18/23 07:34 V28980MSA
<0.190 µg/L 0.190 0.500n-Propylbenzene 1 01/18/23 07:34 V28980MSA
<0.220 µg/L 0.220 0.500Styrene 1 01/18/23 07:34 V28980MSA
<0.160 µg/L 0.160 0.5001,1,1,2-Tetrachloroethane 1 01/18/23 07:34 V28980MSA
<0.160 µg/L 0.160 0.5001,1,2,2-Tetrachloroethane 1 01/18/23 07:34 V28980MSA
0.458 J
µg/L 0.220 0.500
Tetrachloroethene 1 01/18/23 07:34 V28980MSA
<0.220 µg/L 0.220 0.500Toluene 1 01/18/23 07:34 V28980MSA
<0.380 µg/L 0.380 0.5001,2,3-Trichlorobenzene 1 01/18/23 07:34 V28980MSA
<0.310 µg/L 0.310 0.5001,2,4-Trichlorobenzene 1 01/18/23 07:34 V28980MSA
<0.160 µg/L 0.160 0.5001,1,1-Trichloroethane 1 01/18/23 07:34 V28980MSA
<0.096 µg/L 0.096 0.5001,1,2-Trichloroethane 1 01/18/23 07:34 V28980MSA
<0.180 µg/L 0.180 0.500Trichloroethene 1 01/18/23 07:34 V28980MSA
<0.180 µg/L 0.180 0.500
Trichlorofluoromethane 1 01/18/23 07:34 V28980MSA
<0.270 µg/L 0.270 0.5001,2,3-Trichloropropane 1 01/18/23 07:34 V28980MSA
<0.190 µg/L 0.190 0.5001,2,4-Trimethylbenzene 1 01/18/23 07:34 V28980MSA
<0.180 µg/L 0.180 0.5001,3,5-Trimethylbenzene 1 01/18/23 07:34 V28980MSA
<1.00 µg/L 1.00 5.00Vinyl Acetate 1 01/18/23 07:34 V28980MSA
<0.170 µg/L 0.170 0.500Vinyl Chloride 1 01/18/23 07:34 V28980MSA
<0.210 µg/L 0.210 0.500o-Xylene 1 01/18/23 07:34 V28980MSA
Qualifiers/
Definitions
Estimated valueJDilution FactorDF
Method Quantitation LimitMQL
Page 12 of 29
,
REPORT OF ANALYSISReport Number :
Project
Information :
NC 28110
23-011-0100
00087
Geological Resources, Inc.
3502 Hayes Road
Scott Ball
Monroe
Danyale Love
Project Manager
GRI # 2451 Received : 01/11/2023
Gate 402
Report Date : 01/18/2023
Sample ID :
Lab No :
Sampled:WSW-9
97288 Matrix:
1/9/2023 12:50
Aqueous
Analytical Method:
Prep Method:
Test Results Units MDL MQL By Analytical
Batch
Date / Time
Analyzed
DF
6200 PT
6200B Prep Batch(es):V28979 01/17/23 14:00
<0.420 µg/L 0.420 1.00m,p-Xylene 1 01/18/23 07:34 V28980MSA
<0.21 µg/L 0.210 0.500Xylene (Total)1 01/18/23 07:34 V28980
Surrogate: 4-Bromofluorobenzene 89.6 Limits: 70-130%01/18/23 07:341 MSA V28980
Surrogate: Dibromofluoromethane 96.4 Limits: 70-130%01/18/23 07:341 MSA V28980
Surrogate: 1,2-Dichloroethane - d4 96.6 Limits: 70-130%01/18/23 07:341 MSA V28980
Surrogate: Toluene-d8 96.4 Limits: 70-130%01/18/23 07:341 MSA V28980
Qualifiers/
Definitions
Estimated valueJDilution FactorDF
Method Quantitation LimitMQL
Page 13 of 29