WS-5280_18117_CA_HRE_20150409_Winnifred

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North Carolina Department of Environment and Natural Resources

Pat McCrory Donald R. van der Vaart
Governor Secretary

April 09, 2015

TO: Herb Berger
Central Office
NC UST Section
NCDENR

FROM: Hanna Assefa
Environmental Toxicologist
NC Division of Waste Management
NCDENR

RE: Health Risk Evaluation
Warf Airport Incident #18117
Winnifred Warf Water Supply Well, WSW-5
7751 US Hwy 158
Reidsville, Rockingham County

During this sampling event, 3 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 (ug/l)*

MCL (ug/l)

2L (ug/l)
92243639005 Benzene 3.2 5
o-Xylene 1.4 10,000
1,2,4-Trimethylbenzene 0.67 400
* The abbreviation ug/l stands for micrograms of contaminant per liter of water and is roughly equivalent to
parts per billion.
** Sum of trihalomethanes.

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.