WS-3844_12787_CA_HRE_20230227_HRE-SW-1

February 27, 2023 Yudivel Cruz Hemandez and Eligio Martinez Lobaton 1322 Winfield Drive Winston-Salem, NC 27105 Re: Health Risk Evaluation of Water Supply Tracking ID: 12787 Dear Mr. Hemandez and Mr. Lobaton:
A water sample was collected from your well, identified as SW-1, located at 4884 NC Hwy 89 E, Walnut Cove, 27052, Stokes County on August 11, 2022. The sample was collected and analyzed as part of the investigation of a petroleum release in the vicinity.
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, 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 below. Sincerely,
Linda Estkowski Hydrogeologist
Winston-Salem Regional Office UST Section, Division of Waste Management, NCDEQ Attachments: Health Risk Evaluation Laboratory Results
cc: WSRO Tim Leatherman, Pyramid Environmental, via email [e-mail] Brenda White, Stokes County Health Dept., via email [e-mail]

February 27, 2023
TO: Linda Estkowski
Winston-Salem Regional Office NC UST Section RE: Health Risk Evaluation
Incident # 12787
Yudivel Cruz Hemandez & Eligio Martinez Lobaton Well Sampling Results 4884 NC Hwy 89 E Walnut Cove, NC
During this sampling event, two 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)
97199 Acetone 2.62 6,000
Methyl tert-butyl ether 1.09 20
µg/L – Stands for micrograms of contaminant per liter of water and is roughly equivalent to parts per billion. 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 27416-0265
22-228-0040
01168
Pyramid Environmental, Inc
PO Box 16265
Tim Leatherman
Greensboro
Received : 08/16/2022
Bonnie's Grocery
Revised Report Date: 09/01/2022
Original Report Date : 08/26/2022
Sample ID :
Lab No :
Sampled:SW-1
97199 Matrix:
8/11/2022 15:45
Aqueous
Analytical Method:
Prep Method:
Test Results Units MDL MQL By Analytical
Batch
Date / Time
Analyzed
DF
6200 PT
6200B Prep Batch(es):V23129 08/24/22 09:00 V23198 08/24/22 09:00
2.62 J µg/L 1.80 10.0Acetone 1 08/25/22 04:44 V23130JLB
<0.180 µg/L 0.180 0.500
Benzene 1 08/25/22 04:44 V23130JLB
<0.210 µg/L 0.210 0.500Bromobenzene 1 08/25/22 04:44 V23130JLB
<0.420 µg/L 0.420 1.00Bromochloromethane 1 08/25/22 04:44 V23130JLB
<0.160 µg/L 0.160 0.500Bromodichloromethane 1 08/25/22 04:44 V23130JLB
<1.50 µg/L 1.50 5.00Bromoform 1 08/25/22 04:44 V23130JLB
<0.280 µg/L 0.280 1.00Bromomethane 1 08/25/22 04:44 V23130JLB
<0.180 µg/L 0.180 0.500n-Butylbenzene 1 08/25/22 04:44 V23130JLB
<0.200 µg/L 0.200 0.500
sec-Butyl benzene 1 08/25/22 04:44 V23130JLB
<0.920 µg/L 0.920 2.00tert-Butyl benzene 1 08/25/22 04:44 V23130JLB
<0.180 µg/L 0.180 0.500Carbon Tetrachloride 1 08/25/22 04:44 V23130JLB
<0.190 µg/L 0.190 0.500Chlorobenzene 1 08/25/22 04:44 V23130JLB
<0.190 µg/L 0.190 0.500Chlorodibromomethane 1 08/25/22 04:44 V23130JLB
<0.430 µg/L 0.430 1.00Chloroethane 1 08/25/22 04:44 V23130JLB
<0.220 µg/L 0.220 0.500Chloroform 1 08/25/22 04:44 V23130JLB
<0.220 µg/L 0.220 0.500Chloromethane 1 08/25/22 04:44 V23130JLB
<0.200 µg/L 0.200 0.5002-Chlorotoluene 1 08/25/22 04:44 V23130JLB
<0.200 µg/L 0.200 0.5004-Chlorotoluene 1 08/25/22 04:44 V23130JLB
<0.500 µg/L 0.500 0.500Di-Isopropyl Ether (DIPE)1 08/25/22 04:44 V23130JLB
<1.10 µg/L 1.10 2.001,2-Dibromo-3-Chloropropane 1 08/25/22 04:44 V23130JLB
<0.200 µg/L 0.200 0.5001,2-Dibromoethane 1 08/25/22 04:44 V23130JLB
<0.230 µg/L 0.230 0.500Dibromomethane 1 08/25/22 04:44 V23130JLB
Qualifiers/
Definitions
Estimated valueJDilution FactorDF
Method Quantitation LimitMQL
Page 99 of 166
,
REPORT OF ANALYSISReport Number :
Project
Information :
NC 27416-0265
22-228-0040
01168
Pyramid Environmental, Inc
PO Box 16265
Tim Leatherman
Greensboro
Received : 08/16/2022
Bonnie's Grocery
Revised Report Date: 09/01/2022
Original Report Date : 08/26/2022
Sample ID :
Lab No :
Sampled:SW-1
97199 Matrix:
8/11/2022 15:45
Aqueous
Analytical Method:
Prep Method:
Test Results Units MDL MQL By Analytical
Batch
Date / Time
Analyzed
DF
6200 PT
6200B Prep Batch(es):V23129 08/24/22 09:00 V23198 08/24/22 09:00
<0.220 µg/L 0.220 0.5001,2-Dichlorobenzene 1 08/25/22 04:44 V23130JLB
<0.190 µg/L 0.190 0.500
1,3-Dichlorobenzene 1 08/25/22 04:44 V23130JLB
<0.210 µg/L 0.210 0.5001,4-Dichlorobenzene 1 08/25/22 04:44 V23130JLB
<1.20 µg/L 1.20 5.00Dichlorodifluoromethane 1 08/25/22 04:44 V23130JLB
<0.240 µg/L 0.240 0.5001,1-Dichloroethane 1 08/25/22 04:44 V23130JLB
<0.150 µg/L 0.150 0.5001,2-Dichloroethane 1 08/25/22 04:44 V23130JLB
<0.150 µg/L 0.150 0.5001,1-Dichloroethene 1 08/25/22 04:44 V23130JLB
<0.200 µg/L 0.200 0.500cis-1,2-Dichloroethene 1 08/25/22 04:44 V23130JLB
<0.180 µg/L 0.180 0.500
trans-1,2-Dichloroethene 1 08/25/22 04:44 V23130JLB
<0.190 µg/L 0.190 0.5001,2-Dichloropropane 1 08/25/22 04:44 V23130JLB
<0.130 µg/L 0.130 0.5001,3-Dichloropropane 1 08/25/22 04:44 V23130JLB
<0.210 µg/L 0.210 2.002,2-Dichloropropane 1 08/25/22 04:44 V23130JLB
<0.200 µg/L 0.200 0.5001,1-Dichloropropene 1 08/25/22 04:44 V23130JLB
<0.210 µg/L 0.210 0.500cis-1,3-Dichloropropene 1 08/25/22 04:44 V23130JLB
<0.150 µg/L 0.150 0.500trans-1,3-Dichloropropene 1 08/25/22 04:44 V23130JLB
<42.0 µg/L 42.0 200Ethanol 1 08/25/22 04:44 V23130JLB
<0.170 µg/L 0.170 0.500Ethylbenzene 1 08/25/22 04:44 V23130JLB
<0.350 µg/L 0.350 3.00Hexachlorobutadiene 1 08/25/22 04:44 V23130JLB
<0.380 µg/L 0.380 1.002-Hexanone 1 08/25/22 04:44 V23130JLB
<0.180 µg/L 0.180 0.500Isopropylbenzene 1 08/25/22 04:44 V23130JLB
<0.089 µg/L 0.089 0.5004-Isopropyl toluene 1 08/25/22 04:44 V23130JLB
<0.710 µg/L 0.710 5.00Methyl Ethyl Ketone (MEK)1 08/25/22 04:44 V23130JLB
Qualifiers/
Definitions
Estimated valueJDilution FactorDF
Method Quantitation LimitMQL
Page 100 of 166
,
REPORT OF ANALYSISReport Number :
Project
Information :
NC 27416-0265
22-228-0040
01168
Pyramid Environmental, Inc
PO Box 16265
Tim Leatherman
Greensboro
Received : 08/16/2022
Bonnie's Grocery
Revised Report Date: 09/01/2022
Original Report Date : 08/26/2022
Sample ID :
Lab No :
Sampled:SW-1
97199 Matrix:
8/11/2022 15:45
Aqueous
Analytical Method:
Prep Method:
Test Results Units MDL MQL By Analytical
Batch
Date / Time
Analyzed
DF
6200 PT
6200B Prep Batch(es):V23129 08/24/22 09:00 V23198 08/24/22 09:00
1.09 µg/L 0.140 1.00Methyl tert-butyl ether (MTBE)1 08/25/22 04:44 V23130JLB
<0.078 µg/L 0.078 1.00
4-Methyl-2-Pentanone 1 08/25/22 04:44 V23130JLB
<0.330 µg/L 0.330 2.00Methylene Chloride 1 08/25/22 04:44 V23130JLB
<0.470 µg/L 0.470 1.00Naphthalene 1 08/25/22 04:44 V23130JLB
<0.190 µg/L 0.190 0.500n-Propylbenzene 1 08/25/22 04:44 V23130JLB
<0.220 µg/L 0.220 0.500Styrene 1 08/25/22 04:44 V23130JLB
<1.60 µg/L 1.60 10.0tert-Butyl Alcohol (TBA)1 08/25/22 04:44 V23199JLB
<0.350 µg/L 0.350 10.0tert-Butyl formate (TBF)1 08/25/22 04:44 V23199JLB
<1.90 µg/L 1.90 10.0
tert-Amyl Alcohol (TAA)1 08/25/22 04:44 V23199JLB
<0.280 µg/L 0.280 10.0tert-Amyl Methyl Ether (TAME)1 08/25/22 04:44 V23199JLB
<0.160 µg/L 0.160 0.5001,1,1,2-Tetrachloroethane 1 08/25/22 04:44 V23130JLB
<0.160 µg/L 0.160 0.5001,1,2,2-Tetrachloroethane 1 08/25/22 04:44 V23130JLB
<0.220 µg/L 0.220 0.500Tetrachloroethene 1 08/25/22 04:44 V23130JLB
<0.220 µg/L 0.220 0.500Toluene 1 08/25/22 04:44 V23130JLB
<0.380 µg/L 0.380 0.5001,2,3-Trichlorobenzene 1 08/25/22 04:44 V23130JLB
<0.310 µg/L 0.310 0.5001,2,4-Trichlorobenzene 1 08/25/22 04:44 V23130JLB
<0.160 µg/L 0.160 0.5001,1,1-Trichloroethane 1 08/25/22 04:44 V23130JLB
<0.096 µg/L 0.096 0.5001,1,2-Trichloroethane 1 08/25/22 04:44 V23130JLB
<0.180 µg/L 0.180 0.500Trichloroethene 1 08/25/22 04:44 V23130JLB
<0.180 µg/L 0.180 0.500Trichlorofluoromethane 1 08/25/22 04:44 V23130JLB
<0.270 µg/L 0.270 0.5001,2,3-Trichloropropane 1 08/25/22 04:44 V23130JLB
<0.190 µg/L 0.190 0.5001,2,4-Trimethylbenzene 1 08/25/22 04:44 V23130JLB
Qualifiers/
Definitions
Estimated valueJDilution FactorDF
Method Quantitation LimitMQL
Page 101 of 166
,
REPORT OF ANALYSISReport Number :
Project
Information :
NC 27416-0265
22-228-0040
01168
Pyramid Environmental, Inc
PO Box 16265
Tim Leatherman
Greensboro
Received : 08/16/2022
Bonnie's Grocery
Revised Report Date: 09/01/2022
Original Report Date : 08/26/2022
Sample ID :
Lab No :
Sampled:SW-1
97199 Matrix:
8/11/2022 15:45
Aqueous
Analytical Method:
Prep Method:
Test Results Units MDL MQL By Analytical
Batch
Date / Time
Analyzed
DF
6200 PT
6200B Prep Batch(es):V23129 08/24/22 09:00 V23198 08/24/22 09:00
<0.180 µg/L 0.180 0.5001,3,5-Trimethylbenzene 1 08/25/22 04:44 V23130JLB
<1.00 µg/L 1.00 5.00
Vinyl Acetate 1 08/25/22 04:44 V23130JLB
<0.170 µg/L 0.170 0.500Vinyl Chloride 1 08/25/22 04:44 V23130JLB
<0.210 µg/L 0.210 0.500o-Xylene 1 08/25/22 04:44 V23130JLB
<0.420 µg/L 0.420 1.00m,p-Xylene 1 08/25/22 04:44 V23130JLB
<0.21 µg/L 0.210 0.500Xylene (Total)1 08/25/22 04:44 V23130
Surrogate: 4-Bromofluorobenzene 99.4 Limits: 70-130%08/25/22 04:441 JLB V23130
Surrogate: Dibromofluoromethane 97.2 Limits: 70-130%08/25/22 04:441 JLB V23130
Surrogate: 1,2-Dichloroethane - d4 97.6 Limits: 70-130%08/25/22 04:441 JLB V23130
Surrogate: Toluene-d8 100 Limits: 70-130%08/25/22 04:441 JLB V23130
Surrogate: 4-Bromofluorobenzene 99.4 Limits: 70-130%08/25/22 04:441 JLB V23199
Surrogate: Dibromofluoromethane 97.2 Limits: 70-130%08/25/22 04:441 JLB V23199
Surrogate: 1,2-Dichloroethane - d4 97.6 Limits: 70-130%08/25/22 04:441 JLB V23199
Surrogate: Toluene-d8 100 Limits: 70-130%08/25/22 04:441 JLB V23199
Qualifiers/
Definitions
Estimated valueJDilution FactorDF
Method Quantitation LimitMQL
Page 102 of 166