WS-9069_44302_CA_HRE_20150429_HRE-WSW-14

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North Carolina Department of Environment and Natural Resources

Pat McCrory Donald R. van der Vaart
Governor Secretary

April 29, 2015

TO: Linda Estkowski
Winston Salem Regional Office
NC UST Section

FROM: Hanna Assefa
Industrial Hygiene Consultant
NC Division of Waste Management

RE: Health Risk Evaluation
Incident # 44302
7993 Cherry Grove Road, (WSW-14)
Reidsville, North Carolina

During this sampling event, 2 contaminants were detected in the well water. One of the contaminants,
benzene, was detected at a concentration that exceeded applicable standards. 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 non-
ingestive 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 (ug/l)* MCL (ug/l) 2L (ug/l)
2939-05 Benzene 21.7 5
Xylene 31.6 20
Shaded boxes indicate a standard has been exceeded.

* The abbreviation ug/l stands for micrograms of contaminant per liter of water and is roughly equivalent to
parts per billion.

RECOMMENDATION: The benzene concentration in this well exceeds the MCL. Therefore, this
water is not recommended for drinking or cooking at this time. No restrictions are recommended for using the
water for other non-ingestive uses, such as showering, bathing, washing dishes, flushing toilets, and hand
washing.