RA-613_3831_CA_HRE_20170926_Amended HREs

September 26, 2017
TO: Mark Petermann
NC UST Section

RE: Health Risk Evaluation Incident # 3831
Person County Ballfield Well Sampling Results
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)
92351414009 1,2-Dichloroethane 18.3 5
Methyl-tert-butyl ether 2,020 20
Diisopropyl ether 38.8 70
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 1,2-dichloroethane methyl-tert-butyl ether concentrations exceed the applicable standards 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. This water should pose no significant health risk for its
current use, which is to flush toilets and for hand washing at a ball field.

David Lilley, Environmental Toxicologist
Division of Waste Management, NCDEQ

September 26, 2017 TO: Mark Petermann
NC UST Section

RE: Health Risk Evaluation Incident # 3831 Moriah Volunteer Fire Department Well Sampling Results
1879 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)
92351414008 1,2-Dichloroethane 18.4 5
Methyl-tert-butyl ether 2,030 20
Diisopropyl ether 38.2 70
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 1,2-dichloroethane methyl-tert-butyl ether concentrations exceed the
applicable standards 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. This water should pose no significant health risk for its
current use, which is to flush toilets and for hand washing at a fire station.

David Lilley, Environmental Toxicologist
Division of Waste Management, NCDEQ