RA-613_3831_CA_HRE_20180213_PW3R Barber

February 13, 2018

TO: Mark Petermann
NC UST Section

RE: Health Risk Evaluation
Incident # 3831
Billy Barber Well Sampling Results
1818 Mt. Harmony Church Road
Rougemont, NC

During this sampling event, three 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)
18A0222-02 Methyl tert-Butyl Ether 440 20
Diisopropyl ether 10 70
1,2-Dichloroethane 1.2 5
Shaded boxes indicate a standard has been exceeded.

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

RECOMMENDATION: The methyl tert-butyl ether concentration exceeds the applicable standard and
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