WS-3988_13356_CA_HRE_20220103_ResultsLetter

North Carolina Department of Environmental Quality | Division of Waste Management
Winston-Salem Regional Office | 450 West Hanes Mill Road | Suite 300 | Winston-Salem, NC 27105 | [phone]

January 3, 2023 Town of Liberty
Mr. Scott Kidd P.O. Box 1006 Liberty, NC 27298 Re: Health Risk Evaluation of Water Supply Tracking ID: Incident #13356, Liberty BP Dear Mr. Kidd: Please find attached the Sample Analytical Results for a water sample collected from your well, identified as WSW-2, located at Greensboro Road and West Bowman Avenue, Liberty, Randolph County, on
November 7, 2022. 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 [e-mail] or at the address or telephone number listed below for the Winston-Salem Regional Office. Sincerely,
Ryan A. Bond, P.G. Environmental Program Consultant Winston-Salem Regional Office UST Section, Division of Waste Management, NCDEQ
Attachments: Town of Liberty Analytical Results Health Risk Evaluation
cc: Scott Kidd, Town of Liberty via email [e-mail] Tara Aker, Randolph County Health Department via email [e-mail] WS-3988_13356_CA_HRE_20230103_ResultsLetter
SGS North America Inc.
Report of Analysis Page 1 of 3
Client Sample ID:WSW-2
Lab Sample ID:LA85112-3 Date Sampled:11/07/22
Matrix:AQ - Ground Water Date Received:11/09/22
Method:SM 6200B Percent Solids:n/a
Project:Liberty BP 248 N. Greensboro Road, Liberty, NC
File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 2K0144996.D 1 11/15/22 22:37 MB n/a n/a V2K4039
Run #2
Purge Volume
Run #1 25.0 ml
Run #2
VOA Special List
CAS No.Compound Result RL MDL Units Q
67-64-1 Acetone ND 10 1.2 ug/l
71-43-2 Benzene ND 0.50 0.27 ug/l
108-86-1 Bromobenzene ND 0.50 0.18 ug/l
74-97-5 Bromochloromethane ND 0.50 0.12 ug/l
75-27-4 Bromodichloromethane ND 0.50 0.18 ug/l
75-25-2 Bromoform ND 0.50 0.10 ug/l
104-51-8 n-Butylbenzene ND 0.50 0.092 ug/l
135-98-8 sec-Butylbenzene ND 0.50 0.14 ug/l
98-06-6 tert-Butylbenzene ND 0.50 0.16 ug/l
56-23-5 Carbon Tetrachloride ND 0.20 0.092 ug/l
108-90-7 Chlorobenzene ND 0.50 0.16 ug/l
75-00-3 Chloroethane ND 0.50 0.055 ug/l
67-66-3 Chloroform ND 0.50 0.094 ug/l
95-49-8 o-Chlorotoluene ND 0.50 0.16 ug/l
106-43-4 p-Chlorotoluene ND 0.50 0.20 ug/l
124-48-1 Dibromochloromethane ND 0.20 0.075 ug/l
96-12-8 1,2-Dibromo-3-chloropropane ND 0.50 0.13 ug/l
106-93-4 1,2-Dibromoethane ND 0.50 0.24 ug/l
75-71-8 Dichlorodifluoromethane ND 0.50 0.12 ug/l
541-73-1 m-Dichlorobenzene ND 0.50 0.063 ug/l
95-50-1 o-Dichlorobenzene ND 0.50 0.20 ug/l
106-46-7 p-Dichlorobenzene ND 0.50 0.22 ug/l
75-34-3 1,1-Dichloroethane ND 0.50 0.10 ug/l
107-06-2 1,2-Dichloroethane ND 0.20 0.12 ug/l
75-35-4 1,1-Dichloroethylene 0.45 0.50 0.094 ug/l J
156-59-2 cis-1,2-Dichloroethylene 0.18 0.50 0.11 ug/l J
156-60-5 trans-1,2-Dichloroethylene ND 0.50 0.15 ug/l
78-87-5 1,2-Dichloropropane ND 0.30 0.13 ug/l
142-28-9 1,3-Dichloropropane ND 0.50 0.21 ug/l
594-20-7 2,2-Dichloropropane ND 0.50 0.079 ug/l
563-58-6 1,1-Dichloropropene ND 0.50 0.12 ug/l
10061-01-5 cis-1,3-Dichloropropene ND 0.20 0.10 ug/l
ND = Not detected MDL = Method Detection Limit J = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
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LA8511233.3
SGS North America Inc.
Report of Analysis Page 2 of 3
Client Sample ID:WSW-2
Lab Sample ID:LA85112-3 Date Sampled:11/07/22
Matrix:AQ - Ground Water Date Received:11/09/22
Method:SM 6200B Percent Solids:n/a
Project:Liberty BP 248 N. Greensboro Road, Liberty, NC
VOA Special List
CAS No.Compound Result RL MDL Units Q
10061-02-6 trans-1,3-Dichloropropene ND 0.20 0.056 ug/l
108-20-3 Di-Isopropyl Ether ND 0.50 0.073 ug/l
64-17-5 Ethyl Alcohol ND 50 8.4 ug/l
100-41-4 Ethylbenzene ND 0.50 0.20 ug/l
591-78-6 2-Hexanone ND 1.0 0.42 ug/l
87-68-3 Hexachlorobutadiene ND 0.20 0.11 ug/l
98-82-8 Isopropylbenzene ND 0.50 0.13 ug/l
99-87-6 p-Isopropyltoluene ND 0.50 0.13 ug/l
74-83-9 Methyl Bromide ND 0.50 0.23 ug/l
74-87-3 Methyl Chloride ND 0.50 0.066 ug/l
74-95-3 Methylene Bromide ND 0.50 0.11 ug/l
75-09-2 Methylene Chloride ND 0.50 0.080 ug/l
78-93-3 Methyl Ethyl Ketone ND 25 0.28 ug/l
108-10-1 4-Methyl-2-pentanone ND 0.50 0.24 ug/l
1634-04-4 Methyl Tert Butyl Ether ND 0.50 0.068 ug/l
91-20-3 Naphthalene ND 0.50 0.10 ug/l
103-65-1 n-Propylbenzene ND 0.50 0.22 ug/l
100-42-5 Styrene ND 0.50 0.13 ug/l
630-20-6 1,1,1,2-Tetrachloroethane ND 0.50 0.18 ug/l
79-34-5 1,1,2,2-Tetrachloroethane ND 0.20 0.12 ug/l
127-18-4 Tetrachloroethylene ND 0.50 0.22 ug/l
108-88-3 Toluene ND 0.50 0.29 ug/l
87-61-6 1,2,3-Trichlorobenzene ND 0.50 0.16 ug/l
120-82-1 1,2,4-Trichlorobenzene ND 0.50 0.17 ug/l
71-55-6 1,1,1-Trichloroethane ND 0.50 0.16 ug/l
79-00-5 1,1,2-Trichloroethane ND 0.30 0.17 ug/l
79-01-6 Trichloroethylene 1.2 0.50 0.18 ug/l
75-69-4 Trichlorofluoromethane ND 0.50 0.073 ug/l
96-18-4 1,2,3-Trichloropropane ND 0.50 0.023 ug/l
95-63-6 1,2,4-Trimethylbenzene ND 0.50 0.15 ug/l
108-67-8 1,3,5-Trimethylbenzene ND 0.50 0.16 ug/l
108-05-4 Vinyl Acetate ND 0.50 0.069 ug/l
75-01-4 Vinyl Chloride ND 0.10 0.075 ug/l
m,p-Xylene ND 1.0 0.34 ug/l
95-47-6 o-Xylene ND 0.50 0.15 ug/l
1330-20-7 Xylene (total)ND 0.50 0.16 ug/l
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
17060-07-0 1,2-Dichloroethane-D4 104%70-130%
ND = Not detected MDL = Method Detection Limit J = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
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LA8511233.3
SGS North America Inc.
Report of Analysis Page 3 of 3
Client Sample ID:WSW-2
Lab Sample ID:LA85112-3 Date Sampled:11/07/22
Matrix:AQ - Ground Water Date Received:11/09/22
Method:SM 6200B Percent Solids:n/a
Project:Liberty BP 248 N. Greensboro Road, Liberty, NC
VOA Special List
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
2037-26-5 Toluene-D8 105%70-130%
460-00-4 4-Bromofluorobenzene 98%70-130%
ND = Not detected MDL = Method Detection Limit J = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
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LA8511233.3

January 3, 2023 TO: Ryan Bond
Winston-Salem Regional Office
NC UST Section RE: Health Risk Evaluation Incident # 13356
Town of Liberty Well #2 Sampling Results
Intersection of North Greensboro Street and West Bowman Avenue Liberty, 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)
LA85112-3 1,1-Dichloroethylene 0.45 7
cis-1,2-Dichloroethylene 0.18 70
Trichloroethylene 1.2 5
µg/L – Micrograms of contaminant per liter of water, roughly equivalent to parts per billion.
RECOMMENDATION: None of the contaminants detected exceed the applicable water standards. Therefore, no restrictions on the use of this water are recommended at this time. Although none of the contaminant levels exceed the applicable regulatory values, the level of trichloroethylene in this well exceeds 1 µg/L, the value recommended by the North Carolina Department
of Health and Human Services (DHHS). The well user may want to contact the Private Well and Health program at (919) 707- 5900 for more information.
David Lilley, Environmental Toxicologist Division of Waste Management, NCDEQ