MO-5901_21536_M_DENR_20230209_HRE 2110 Dallas Hwy

February 9, 2023
TO: Vince Antrilli
NC Superfund Section RE: Health Risk Evaluation NONCD0001767
2110 Dallas Stanley Hwy. Well Sampling Results Stanley, NC During this sampling event, five 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)
YA04023-006 Benzene 8.7 5
Cyclohexane 0.97 NA NA
1,2-Dichloroethane 12 5
Methyl tertiary butyl ether 4.5 20
Total Xylenes 2.9 10,000
NA – Not Available
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 benzene and 1,2-dichloroethane concentrations in this well exceed
the applicable standards. 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

February 9, 2023
TO: Vince Antrilli NC Superfund Section RE: Health Risk Evaluation
NONCD0001767 2225 Dallas Stanley Hwy. Well Sampling Results Stanley, NC During this sampling event, one contaminant was 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 the contaminant concentration exceeds the applicable standard for using the water for drinking
and cooking, the contaminant concentration is 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 concentration with the applicable standard: Sample ID Contaminant Concentration (µg/L) MCL (µg/L) 2L (µg/L)
YA04023-003 Methyl tertiary butyl ether 0.62 20
µg/L – Stands for micrograms of contaminant per liter of water and is roughly equivalent to parts per billion.
RECOMMENDATION: The detected contaminant did not exceed the applicable water standard. Therefore, no restrictions on the use of this water are recommended at this time.
David Lilley, Environmental Toxicologist Division of Waste Management, NCDEQ