MO-5392_18748_CA_WSW_20221107_MANTOOTHHRE

November 7, 2022 Allen & Patricia Mantooth
137 Fraley Road Gastonia, North Carolina 28052-8426
Re: Health Risk Evaluation of Water Supply Tracking ID: Incident Number: 18748 Dear Mr. & Mrs. Mantooth: Please find attached the Sample Analytical Results for water samples collected from your well, identified as WSW-10, located at 101 Fraley Road, Gastonia, Gaston County, on October 6, 2022. 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 collected by the responsible party’s representative, a
Health Risk Evaluation of the water supply 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 the address or telephone number listed below.
Sincerely, Brad C. Newton, P.G. Hydrogeologist Mooresville Regional Office UST Section, Division of Waste Management, NCDEQ
Attachments: Mantooth Sample Analytical Results Health Risk Evaluation
cc: Miguel Alvalle - IHSB, MRO (via e-mail) Gaston County Health Department Gaston County Manager

November 7, 2022
TO: Brad Newton
Mooresville Regional Office NC UST Section RE: Health Risk Evaluation
Incident # 18748
Mantooth Well Sampling Results 101 Fraley Road Gastonia, NC
During this sampling event, one contaminant was 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 the contaminant concentration exceeds the applicable standard for using the water for drinking
and cooking, the contaminant concentration is 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 concentration with the applicable standard: Sample ID Contaminant Concentration (µg/L) MCL (µg/L) 2L (µg/L)
90072 Tetrachloroethene 1.60 5
µg/L – Stands for micrograms of contaminant per liter of water and is roughly equivalent to parts per billion.
RECOMMENDATION: The detected contaminant did not exceed the applicable water standard.
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
22-279-0031
00087
Geological Resources, Inc.
3502 Hayes Road
Scott Ball
Monroe
Danyale Love
Project Manager
GRI # 2451 Received : 10/06/2022
Gate 402
Report Date : 10/18/2022
Sample ID :
Lab No :
Sampled:WSW-10
90072 Matrix:
10/6/2022 12:48
Aqueous
Analytical Method:
Prep Method:
Test Results Units MDL MQL By Analytical
Batch
Date / Time
Analyzed
DF
6200 PT
6200B Prep Batch(es):V25074 10/12/22 14:00
<1.80 µg/L 1.80 10.0Acetone 1 10/12/22 21:53 V25077MSA
<0.180 µg/L 0.180 0.500Benzene 1 10/12/22 21:53 V25077MSA
<0.210 µg/L 0.210 0.500Bromobenzene 1 10/12/22 21:53 V25077MSA
<0.420 µg/L 0.420 1.00Bromochloromethane 1 10/12/22 21:53 V25077MSA
<0.160 µg/L 0.160 0.500Bromodichloromethane 1 10/12/22 21:53 V25077MSA
<1.50 µg/L 1.50 5.00Bromoform 1 10/12/22 21:53 V25077MSA
<0.280 µg/L 0.280 1.00Bromomethane 1 10/12/22 21:53 V25077MSA
<0.180 µg/L 0.180 0.500n-Butylbenzene 1 10/12/22 21:53 V25077MSA
<0.200 µg/L 0.200 0.500
sec-Butyl benzene 1 10/12/22 21:53 V25077MSA
<0.920 µg/L 0.920 2.00tert-Butyl benzene 1 10/12/22 21:53 V25077MSA
<0.180 µg/L 0.180 0.500Carbon Tetrachloride 1 10/12/22 21:53 V25077MSA
<0.190 µg/L 0.190 0.500Chlorobenzene 1 10/12/22 21:53 V25077MSA
<0.190 µg/L 0.190 0.500Chlorodibromomethane 1 10/12/22 21:53 V25077MSA
<0.430 µg/L 0.430 1.00Chloroethane 1 10/12/22 21:53 V25077MSA
<0.220 µg/L 0.220 0.500Chloroform 1 10/12/22 21:53 V25077MSA
<0.220 µg/L 0.220 0.500
Chloromethane 1 10/12/22 21:53 V25077MSA
<0.200 µg/L 0.200 0.5002-Chlorotoluene 1 10/12/22 21:53 V25077MSA
<0.200 µg/L 0.200 0.5004-Chlorotoluene 1 10/12/22 21:53 V25077MSA
<0.500 µg/L 0.500 0.500Di-Isopropyl Ether (DIPE)1 10/12/22 21:53 V25077MSA
<1.10 µg/L 1.10 2.001,2-Dibromo-3-Chloropropane 1 10/12/22 21:53 V25077MSA
<0.200 µg/L 0.200 0.5001,2-Dibromoethane 1 10/12/22 21:53 V25077MSA
<0.230 µg/L 0.230 0.500Dibromomethane 1 10/12/22 21:53 V25077MSA
Qualifiers/
Definitions
Estimated valueJDilution FactorDF
Method Quantitation LimitMQL
Page 10 of 29
,
REPORT OF ANALYSISReport Number :
Project
Information :
NC 28110
22-279-0031
00087
Geological Resources, Inc.
3502 Hayes Road
Scott Ball
Monroe
Danyale Love
Project Manager
GRI # 2451 Received : 10/06/2022
Gate 402
Report Date : 10/18/2022
Sample ID :
Lab No :
Sampled:WSW-10
90072 Matrix:
10/6/2022 12:48
Aqueous
Analytical Method:
Prep Method:
Test Results Units MDL MQL By Analytical
Batch
Date / Time
Analyzed
DF
6200 PT
6200B Prep Batch(es):V25074 10/12/22 14:00
<0.220 µg/L 0.220 0.5001,2-Dichlorobenzene 1 10/12/22 21:53 V25077MSA
<0.190 µg/L 0.190 0.5001,3-Dichlorobenzene 1 10/12/22 21:53 V25077MSA
<0.210 µg/L 0.210 0.5001,4-Dichlorobenzene 1 10/12/22 21:53 V25077MSA
<1.20 µg/L 1.20 5.00Dichlorodifluoromethane 1 10/12/22 21:53 V25077MSA
<0.240 µg/L 0.240 0.5001,1-Dichloroethane 1 10/12/22 21:53 V25077MSA
<0.150 µg/L 0.150 0.5001,2-Dichloroethane 1 10/12/22 21:53 V25077MSA
<0.150 µg/L 0.150 0.5001,1-Dichloroethene 1 10/12/22 21:53 V25077MSA
<0.200 µg/L 0.200 0.500cis-1,2-Dichloroethene 1 10/12/22 21:53 V25077MSA
<0.180 µg/L 0.180 0.500
trans-1,2-Dichloroethene 1 10/12/22 21:53 V25077MSA
<0.190 µg/L 0.190 0.5001,2-Dichloropropane 1 10/12/22 21:53 V25077MSA
<0.130 µg/L 0.130 0.5001,3-Dichloropropane 1 10/12/22 21:53 V25077MSA
<0.210 µg/L 0.210 2.002,2-Dichloropropane 1 10/12/22 21:53 V25077MSA
<0.200 µg/L 0.200 0.5001,1-Dichloropropene 1 10/12/22 21:53 V25077MSA
<0.210 µg/L 0.210 0.500cis-1,3-Dichloropropene 1 10/12/22 21:53 V25077MSA
<0.150 µg/L 0.150 0.500trans-1,3-Dichloropropene 1 10/12/22 21:53 V25077MSA
<42.0 µg/L 42.0 200
Ethanol 1 10/12/22 21:53 V25077MSA
<0.170 µg/L 0.170 0.500Ethylbenzene 1 10/12/22 21:53 V25077MSA
<0.350 µg/L 0.350 3.00Hexachlorobutadiene 1 10/12/22 21:53 V25077MSA
<0.380 µg/L 0.380 1.002-Hexanone 1 10/12/22 21:53 V25077MSA
<0.180 µg/L 0.180 0.500Isopropylbenzene 1 10/12/22 21:53 V25077MSA
<0.089 µg/L 0.089 0.5004-Isopropyl toluene 1 10/12/22 21:53 V25077MSA
<0.710 µg/L 0.710 5.00Methyl Ethyl Ketone (MEK)1 10/12/22 21:53 V25077MSA
Qualifiers/
Definitions
Estimated valueJDilution FactorDF
Method Quantitation LimitMQL
Page 11 of 29
,
REPORT OF ANALYSISReport Number :
Project
Information :
NC 28110
22-279-0031
00087
Geological Resources, Inc.
3502 Hayes Road
Scott Ball
Monroe
Danyale Love
Project Manager
GRI # 2451 Received : 10/06/2022
Gate 402
Report Date : 10/18/2022
Sample ID :
Lab No :
Sampled:WSW-10
90072 Matrix:
10/6/2022 12:48
Aqueous
Analytical Method:
Prep Method:
Test Results Units MDL MQL By Analytical
Batch
Date / Time
Analyzed
DF
6200 PT
6200B Prep Batch(es):V25074 10/12/22 14:00
<0.140 µg/L 0.140 1.00Methyl tert-butyl ether (MTBE)1 10/12/22 21:53 V25077MSA
<0.078 µg/L 0.078 1.004-Methyl-2-Pentanone 1 10/12/22 21:53 V25077MSA
<0.330 µg/L 0.330 2.00Methylene Chloride 1 10/12/22 21:53 V25077MSA
<0.470 µg/L 0.470 1.00Naphthalene 1 10/12/22 21:53 V25077MSA
<0.190 µg/L 0.190 0.500n-Propylbenzene 1 10/12/22 21:53 V25077MSA
<0.220 µg/L 0.220 0.500Styrene 1 10/12/22 21:53 V25077MSA
<0.160 µg/L 0.160 0.5001,1,1,2-Tetrachloroethane 1 10/12/22 21:53 V25077MSA
<0.160 µg/L 0.160 0.5001,1,2,2-Tetrachloroethane 1 10/12/22 21:53 V25077MSA
1.60 µg/L 0.220 0.500
Tetrachloroethene 1 10/12/22 21:53 V25077MSA
<0.220 µg/L 0.220 0.500Toluene 1 10/12/22 21:53 V25077MSA
<0.380 µg/L 0.380 0.5001,2,3-Trichlorobenzene 1 10/12/22 21:53 V25077MSA
<0.310 µg/L 0.310 0.5001,2,4-Trichlorobenzene 1 10/12/22 21:53 V25077MSA
<0.160 µg/L 0.160 0.5001,1,1-Trichloroethane 1 10/12/22 21:53 V25077MSA
<0.096 µg/L 0.096 0.5001,1,2-Trichloroethane 1 10/12/22 21:53 V25077MSA
<0.180 µg/L 0.180 0.500Trichloroethene 1 10/12/22 21:53 V25077MSA
<0.180 µg/L 0.180 0.500
Trichlorofluoromethane 1 10/12/22 21:53 V25077MSA
<0.270 µg/L 0.270 0.5001,2,3-Trichloropropane 1 10/12/22 21:53 V25077MSA
<0.190 µg/L 0.190 0.5001,2,4-Trimethylbenzene 1 10/12/22 21:53 V25077MSA
<0.180 µg/L 0.180 0.5001,3,5-Trimethylbenzene 1 10/12/22 21:53 V25077MSA
<1.00 µg/L 1.00 5.00Vinyl Acetate 1 10/12/22 21:53 V25077MSA
<0.170 µg/L 0.170 0.500Vinyl Chloride 1 10/12/22 21:53 V25077MSA
<0.210 µg/L 0.210 0.500o-Xylene 1 10/12/22 21:53 V25077MSA
Qualifiers/
Definitions
Estimated valueJDilution FactorDF
Method Quantitation LimitMQL
Page 12 of 29
,
REPORT OF ANALYSISReport Number :
Project
Information :
NC 28110
22-279-0031
00087
Geological Resources, Inc.
3502 Hayes Road
Scott Ball
Monroe
Danyale Love
Project Manager
GRI # 2451 Received : 10/06/2022
Gate 402
Report Date : 10/18/2022
Sample ID :
Lab No :
Sampled:WSW-10
90072 Matrix:
10/6/2022 12:48
Aqueous
Analytical Method:
Prep Method:
Test Results Units MDL MQL By Analytical
Batch
Date / Time
Analyzed
DF
6200 PT
6200B Prep Batch(es):V25074 10/12/22 14:00
<0.420 µg/L 0.420 1.00m,p-Xylene 1 10/12/22 21:53 V25077MSA
<0.21 µg/L 0.210 0.500Xylene (Total)1 10/12/22 21:53 V25077
Surrogate: 4-Bromofluorobenzene 98.8 Limits: 70-130%10/12/22 21:531 MSA V25077
Surrogate: Dibromofluoromethane 105 Limits: 70-130%10/12/22 21:531 MSA V25077
Surrogate: 1,2-Dichloroethane - d4 98.8 Limits: 70-130%10/12/22 21:531 MSA V25077
Surrogate: Toluene-d8 98.6 Limits: 70-130%10/12/22 21:531 MSA V25077
Qualifiers/
Definitions
Estimated valueJDilution FactorDF
Method Quantitation LimitMQL
Page 13 of 29