WS-6343_23942_CA_HRE_20230314_HRE-wsw-2-DavenportEnergy

March 14, 2023 Davenport Energy 10969 US Hwy 158 West Ruffin, NC 27326 Re: Health Risk Evaluation of Water Supply Tracking ID: 23942 Dear Madam/Sir: A water sample was collected from your well, identified as wsw-2, located at 10969 US Hwy 158, West, Ruffin, Caswell County on October 20, 2022. The sample was collected
and analyzed as part of the investigation of a petroleum release in the vicinity. Because contaminants were detected in the water sample, a Health Risk Evaluation of the
water supply was performed by an environmental toxicologist in the Division of Waste Management. The Health Risk Evaluation, which is attached, compares the detected concentration of contaminants to acceptable concentrations and provides a recommendation for safe use of the water. If you have any questions, please contact Dave Lilley at [phone] or contact me at the address or telephone number below. Sincerely,
Linda Estkowski Hydrogeologist Winston-Salem Regional Office UST Section, Division of Waste Management, NCDEQ
Attachments: Health Risk Evaluation Laboratory Results cc: WSRO
Donnie Powell, Caswell County Health Dept., via email [e-mail] Wayne Watterson, S&ME, via email [e-mail]

March 14, 2023
TO: Linda Estkowski
Winston-Salem Regional Office NC UST Section RE: Health Risk Evaluation
Incident # 23942
Davenport Energy Well Sampling Results 10969 US Hwy 158 West Ruffin, NC
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)
92632314017 Diisopropyl ether 2.0 70
Methyl-tert-butyl ether 4.1 20
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