RA-7359_39486_CA_HRE_20230914_Determination WSW 1Howard

September 14, 2023
TO: Mark Petermann
NC UST Section RE: Health Risk Evaluation Incident # 39486
Howard Property Well Sampling Results 100 Singleton Street Raleigh, NC
During this sampling event, four 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 (µg/L) MCL (µg/L) 2L (µg/L)
92674179006 Toluene 7.6 1,000
Total Xylenes 7.0 10,000
1,2,4-Trimethylbenzene 1.3 400
Ethylbenzene 1.4 700
µg/L – Stands for micrograms of contaminant per liter of water and is roughly equivalent to parts per billion.
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.
David Lilley, Environmental Toxicologist Division of Waste Management, NCDEQ