WS-8622_37884_CA_WSW_20230111_SW5

January 11, 2023

Robert and Ruth Jones
6812 Coltrane Mill Road
Greensboro, NC 27406

Re: Health Risk Evaluation of Water Supply
Tracking ID: Hilltop Store-B, Incident #37884

Dear Mr. and Ms. Jones:

Please find attached the Sample Analytical Results for water supply well sample collected from your well,
identified as SW-5, located at 6812 Coltrane Mill Road, 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 [phone] 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-5 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
Robert Jones Well Sampling Results
6812 Coltrane Mill Road
Greensboro, 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)
95183 Chloroform 0.852 80*
µg/L – Stands for micrograms of contaminant per liter of water and is roughly equivalent to parts per
billion.
* As total trihalomethanes.
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