HomeMy WebLinkAboutWS-8622_37884_CA_WSW_20230111_SW1
January 11, 2023
Attn: Shehzad Quamar
MSZ786 Trading, Inc.
1025 Gatewood Avenue
Greensboro, NC 27405
Re: Health Risk Evaluation of Water Supply
Tracking ID: Hilltop Store-B, Incident #37884
Dear Mr. Quamar:
Please find attached the Sample Analytical Results for water supply well sample collected from your well,
identified as SW-1, located at 801 NC Highway 62 West, Greensboro, Guilford County, on December 8,
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 also 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 (919) 707-8241 or contact Ashley Dinkins at (336)
641-5557 or at the Guilford County Department of Health and Human Services office located at 400 W.
Market Street, Suite 300, Greensboro, NC 27401.
Sincerely,
James W. Brown
Regional Supervisor
Winston-Salem Regional Office
UST Section, Division of Waste Management, NCDEQ
Attachment: SW-1 Sample Analytical Results
Health Risk Evaluation
cc: Iulia Vann, Guilford County Department of Health and Human Services
Michael Halford, Guilford County
January 10, 2023
TO: Ashley Dinkins
Guilford County Department of Health and Human Services for
Winston-Salem Regional Office
NC UST Section
RE: Health Risk Evaluation
Incident # 37884
Stop & Shop, Inc. Well Sampling Results
801 NC Highway 62 West
Greensboro, NC
During this sampling event, eight 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 contaminant concentrations exceed the applicable standards for using the water for drinking
and cooking, the 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 standard:
Sample ID Contaminant Concentration (µg/L) MCL (µg/L) 2L (µg/L)
95180 Benzene 10.7 5
Chloroform 4.11 80*
Methylene Chloride 0.538 5
Methyl-tert-butyl ether 2.88 20
Naphthalene 4.48 6
n-Propylbenzene 0.220 70
tert-Butyl Alcohol 7.16 10**
tert-Amyl Alcohol 54.7 NA NA
Shaded boxes indicate a standard has been exceeded.
NA – Not Available
µg/L – Stands for micrograms of contaminant per liter of water and is roughly equivalent to parts per
billion.
* As total trihalomethanes.
** This value is an Interim Maximum Allowable Concentration (IMAC).
RECOMMENDATION: The benzene concentration exceeds the applicable standard, and the
total risk exceeds the level that would be considered safe for other household uses. Therefore, this water
is not recommended for any residential use at this time.
David Lilley, Environmental Toxicologist
Division of Waste Management, NCDEQ