RA-527_3327_CA_WSW_20111214_HRE for Bledsoe Well WSW2

1646 Mail Service Center, Raleigh, North Carolina 27699-1646
Phone/Fax: [phone] \ Internet: http://portal.ncdenr.org/web/wm/
An Equal Opportunity \ Affirmative Action Employer

December 13, 2011

TO: Mark Petermann
Central Office
NC UST Section

FROM: Hanna Assefa
Environmental Toxicologist
NC Division of Waste Management

RE: Health Risk Evaluation
Former Billy’s/Ken’s Mini Mart Property
Stephen Bledsoe Property Well
117 Phelps Road (WSW-2)
Cedar Grove, Orange County
Incident # 3327

During this sampling event, four contaminants were detected in the well water. One of the
contaminants, chloroform, 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:

North Carolina Department of Environment and Natural Resources
Division of Waste Management
Beverly Eaves Perdue Dexter R. Matthews
Governor Director Dee Freeman
Secretary

1646 Mail Service Center, Raleigh, North Carolina 27699-1646
Phone/Fax: [phone] \ Internet: http://portal.ncdenr.org/web/wm/
An Equal Opportunity \ Affirmative Action Employer

Sample ID Contaminant Concentration (ug/l)* MCL (ug/l) 2L (ug/l)
1110326 Acetone 26 Not Available 6,000
Chloroform 97 80** Not Applicable
Methyl Ethyl Ketone (2-
Butanone) 83 Not Available 4,000
Methyl-tert-Butyl Ether 0.94 J Not Available 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.
** As total trihalomethanes.
J – Estimated Concentration

RECOMMENDATION: The chloroform 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.