MO-27965_47256_CA_HRE_20220722

July 22, 2022 TO: Dan Bowser
Mooresville Regional Office
NC UST Section RE: Health Risk Evaluation Incident # 47256
Kwik Mart Well Sampling Results
WSW-1 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)
V 93996 Trichloroethene 2.66 5
µg/L – Micrograms of contaminant per liter of water, 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. Although the contaminant level did not exceed the applicable regulatory value, the level of
trichloroethene in this well exceeds 1 µg/L, the value recommended by the North Carolina Department
of Health and Human Services (DHHS). The well user may want to contact the Private Well and Health program at (919) 707- 5900 for more information.
David Lilley, Environmental Toxicologist Division of Waste Management, NCDEQ

July 22, 2022 TO: Dan Bowser Mooresville Regional Office
NC UST Section RE: Health Risk Evaluation Incident # 47256 Kwik Mart Well Sampling Results
WSW-2 During this sampling event, two 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)
V 93997 Methyl tert-butyl ether 1.80 20
Trichloroethene 1.01 5
µg/L – Micrograms of contaminant per liter of water, roughly equivalent to parts per billion. RECOMMENDATION: None of the contaminants detected exceed the applicable water standards.
Therefore, no restrictions on the use of this water are recommended at this time.
Although none of the contaminant levels exceed the applicable regulatory values, the level of trichloroethene in this well exceeds 1 µg/L, the value recommended by the North Carolina Department of Health and Human Services (DHHS). The well user may want to contact the Private Well and Health
program at (919) 707- 5900 for more information.

David Lilley, Environmental Toxicologist
Division of Waste Management, NCDEQ

July 22, 2022

TO: Dan Bowser Mooresville Regional Office NC UST Section
RE: Health Risk Evaluation Incident # 47256 Kwik Mart Well Sampling Results WSW-5

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 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)
V 93998 Bromodichloromethane 13.6 80*
Chlorodibromomethane 3.83 80*
Chloroform 46.5 80*
µg/L – Micrograms of contaminant per liter of water, roughly equivalent to parts per billion. * As total trihalomethanes.
RECOMMENDATION: None of the contaminants detected exceed the applicable water standards. Therefore, no restrictions on the use of this water are recommended at this time. Although none of the contaminant levels exceed the applicable regulatory values, the levels of
bromodichloromethane and chlorodibromomethane in this well exceed the values recommended by the
North Carolina Department of Health and Human Services (DHHS) of 0.6 µg/L and 0.5 µg/L, respectively. The well user may want to contact the Private Well and Health program at (919) 707- 5900 for more information.

David Lilley, Environmental Toxicologist
Division of Waste Management, NCDEQ