MO-108_27094_G_WSW_20230929_ABERNETHYHRE

September 29, 2023 Jack & Sarah Abernethy
P.O. Box 216 Alexis, North Carolina 28006
Re: Health Risk Evaluation of Water Supply Tracking ID: Inc. No. 27094 Dear Mr. & Mrs. Smith: Please find attached the Sample Analytical Results for a water sample collected from your well, identified as WSW-11, located at 403 Charlotte Street, Alexis, Gaston County, on August 23, 2023. The sample was collected and analyzed as part of the investigation of a petroleum release in the vicinity. The water sample was analyzed for specific target analytes (contaminants), which are listed on the attached Sample Analytical Results. Contaminants were detected in the water sample, as shown on the attached Sample Analytical Results.
Because contaminants were detected in the water sample, 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 Dave Lilley at [phone], or contact me at the address or telephone
number listed below for the Mooresville Regional Office. Sincerely, Brad C. Newton, P.G. Hydrogeologist Mooresville Regional Office UST Section, Division of Waste Management, NCDEQ
Attachments: Harrison Sample Analytical Results Health Risk Evaluation
cc: Gaston County Health Department Gaston County Manager

September 29, 2023

TO: Brad Newton Mooresville Regional Office NC UST Section
RE: Health Risk Evaluation
Incident # 27094 Abernathy Well Sampling Results 409 Charlotte Street Gaston, 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)
92684314006 Methyl-tert-butyl ether 0.97 20
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
#=AR#
ANALYTICAL RESULTS
Pace Project No.:
Project:
92684314
ALEXIS GROCERY
Sample:WSW-13 Lab ID:92684314006 Collected:08/18/23 00:00 Received:08/23/23 13:10 Matrix:Water
Parameters Results Units DF Prepared Analyzed CAS No.QualReport Limit
Analytical Method: EPA 504.1 Preparation Method: EPA 504.1
Pace Analytical Services - Charlotte
504 GCS EDB and DBCP
1,2-Dibromo-3-chloropropane ND ug/L 09/01/23 02:52 96-12-808/31/23 10:530.050 1
1,2-Dibromoethane (EDB)ND ug/L 09/01/23 02:52 106-93-408/31/23 10:530.020 1
1,2,3-Trichloropropane ND ug/L 09/01/23 02:52 96-18-408/31/23 10:530.050 1
Surrogates
1-Chloro-2-bromopropane (S)90 %09/01/23 02:52 301-79-5608/31/23 10:5370-130 1
Analytical Method: SM 6200B
Pace Analytical Services - Charlotte
6200B MSV
Benzene ND ug/L 08/24/23 22:09 71-43-20.50 1
Bromobenzene ND ug/L 08/24/23 22:09 108-86-10.50 1
Bromochloromethane ND ug/L 08/24/23 22:09 74-97-50.50 1
Bromodichloromethane ND ug/L 08/24/23 22:09 75-27-40.50 1
Bromoform ND ug/L 08/24/23 22:09 75-25-20.50 1
Bromomethane ND ug/L 08/24/23 22:09 74-83-95.0 1
n-Butylbenzene ND ug/L 08/24/23 22:09 104-51-80.50 1
sec-Butylbenzene ND ug/L 08/24/23 22:09 135-98-80.50 1
tert-Butylbenzene ND ug/L 08/24/23 22:09 98-06-60.50 1
Carbon tetrachloride ND ug/L 08/24/23 22:09 56-23-50.50 1
Chlorobenzene ND ug/L 08/24/23 22:09 108-90-70.50 1
Chloroethane ND ug/L 08/24/23 22:09 75-00-31.0 1
Chloroform ND ug/L 08/24/23 22:09 67-66-30.50 1
Chloromethane ND ug/L 08/24/23 22:09 74-87-31.0 1
2-Chlorotoluene ND ug/L 08/24/23 22:09 95-49-80.50 1
4-Chlorotoluene ND ug/L 08/24/23 22:09 106-43-40.50 1
1,2-Dibromo-3-chloropropane ND ug/L 08/24/23 22:09 96-12-81.0 1
Dibromochloromethane ND ug/L 08/24/23 22:09 124-48-10.50 1
1,2-Dibromoethane (EDB)ND ug/L 08/24/23 22:09 106-93-40.50 1
Dibromomethane ND ug/L 08/24/23 22:09 74-95-30.50 1
1,2-Dichlorobenzene ND ug/L 08/24/23 22:09 95-50-10.50 1
1,3-Dichlorobenzene ND ug/L 08/24/23 22:09 541-73-10.50 1
1,4-Dichlorobenzene ND ug/L 08/24/23 22:09 106-46-70.50 1
Dichlorodifluoromethane ND ug/L 08/24/23 22:09 75-71-8 L10.50 1
1,1-Dichloroethane ND ug/L 08/24/23 22:09 75-34-30.50 1
1,2-Dichloroethane ND ug/L 08/24/23 22:09 107-06-20.50 1
1,1-Dichloroethene ND ug/L 08/24/23 22:09 75-35-40.50 1
cis-1,2-Dichloroethene ND ug/L 08/24/23 22:09 156-59-20.50 1
trans-1,2-Dichloroethene ND ug/L 08/24/23 22:09 156-60-50.50 1
1,2-Dichloropropane ND ug/L 08/24/23 22:09 78-87-50.50 1
1,3-Dichloropropane ND ug/L 08/24/23 22:09 142-28-90.50 1
2,2-Dichloropropane ND ug/L 08/24/23 22:09 594-20-70.50 1
1,1-Dichloropropene ND ug/L 08/24/23 22:09 563-58-60.50 1
cis-1,3-Dichloropropene ND ug/L 08/24/23 22:09 10061-01-50.50 1
trans-1,3-Dichloropropene ND ug/L 08/24/23 22:09 10061-02-60.50 1
Diisopropyl ether ND ug/L 08/24/23 22:09 108-20-30.50 1
Ethylbenzene ND ug/L 08/24/23 22:09 100-41-40.50 1
Hexachloro-1,3-butadiene ND ug/L 08/24/23 22:09 87-68-32.0 1
REPORT OF LABORATORY ANALYSIS
This report shall not be reproduced, except in full,
without the written consent of Pace Analytical Services, LLC.Date: 09/01/2023 10:22 AM
Pace Analytical Services, LLC
9800 Kincey Ave. Suite 100
Huntersville, NC 28078
[phone]
Page 14 of 39
#=AR#
ANALYTICAL RESULTS
Pace Project No.:
Project:
92684314
ALEXIS GROCERY
Sample:WSW-13 Lab ID:92684314006 Collected:08/18/23 00:00 Received:08/23/23 13:10 Matrix:Water
Parameters Results Units DF Prepared Analyzed CAS No.QualReport Limit
Analytical Method: SM 6200B
Pace Analytical Services - Charlotte
6200B MSV
Isopropylbenzene (Cumene)ND ug/L 08/24/23 22:09 98-82-80.50 1
Methylene Chloride ND ug/L 08/24/23 22:09 75-09-22.0 1
Methyl-tert-butyl ether 0.97 ug/L 08/24/23 22:09 1634-04-40.50 1
Naphthalene ND ug/L 08/24/23 22:09 91-20-32.0 1
n-Propylbenzene ND ug/L 08/24/23 22:09 103-65-10.50 1
Styrene ND ug/L 08/24/23 22:09 100-42-50.50 1
1,1,1,2-Tetrachloroethane ND ug/L 08/24/23 22:09 630-20-60.50 1
1,1,2,2-Tetrachloroethane ND ug/L 08/24/23 22:09 79-34-50.50 1
Tetrachloroethene ND ug/L 08/24/23 22:09 127-18-40.50 1
Toluene ND ug/L 08/24/23 22:09 108-88-30.50 1
1,2,3-Trichlorobenzene ND ug/L 08/24/23 22:09 87-61-62.0 1
1,2,4-Trichlorobenzene ND ug/L 08/24/23 22:09 120-82-12.0 1
1,1,1-Trichloroethane ND ug/L 08/24/23 22:09 71-55-60.50 1
1,1,2-Trichloroethane ND ug/L 08/24/23 22:09 79-00-50.50 1
Trichloroethene ND ug/L 08/24/23 22:09 79-01-60.50 1
Trichlorofluoromethane ND ug/L 08/24/23 22:09 75-69-41.0 1
1,2,3-Trichloropropane ND ug/L 08/24/23 22:09 96-18-40.50 1
1,2,4-Trimethylbenzene ND ug/L 08/24/23 22:09 95-63-60.50 1
1,3,5-Trimethylbenzene ND ug/L 08/24/23 22:09 108-67-80.50 1
Vinyl chloride ND ug/L 08/24/23 22:09 75-01-41.0 1
m&p-Xylene ND ug/L 08/24/23 22:09 179601-23-11.0 1
o-Xylene ND ug/L 08/24/23 22:09 95-47-60.50 1
Surrogates
1,2-Dichloroethane-d4 (S)105 %08/24/23 22:09 17060-07-070-130 1
4-Bromofluorobenzene (S)97 %08/24/23 22:09 460-00-470-130 1
Toluene-d8 (S)102 %08/24/23 22:09 2037-26-570-130 1
REPORT OF LABORATORY ANALYSIS
This report shall not be reproduced, except in full,
without the written consent of Pace Analytical Services, LLC.Date: 09/01/2023 10:22 AM
Pace Analytical Services, LLC
9800 Kincey Ave. Suite 100
Huntersville, NC 28078
[phone]
Page 15 of 39