RA-2181_13379_CA_HRE_20200128_HRE Determination WSW 2

January 28, 2020
TO: Mark Petermann
NC UST Section RE: Health Risk Evaluation Incident # 13379
James Arvin Well Sampling Results
5837 Fayetteville Road Raleigh, 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 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 (µg/L) MCL (µg/L) 2L (µg/L)
0010188-07 Methyl-tert-Butyl ether 37 20
1,2-Dichloroethane 1.2 5
Isopropyl Ether 0.91 70
Shaded boxes indicate a standard has been exceeded. 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 in this well exceeds the applicable standard. 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.
David Lilley, Environmental Toxicologist Division of Waste Management, NCDEQ