WS-4363_14151_CA_HRE_20161215_Bowman_Prop

PAT MCCRORY Governor DONALD R. VAN DER VAART
Secretary
MICHAEL SCOTT
Director
State of North Carolina | Environmental Quality | Waste Management
1646 Mail Service Center | 217 West Jones Street | Raleigh, NC 27699-1646
919 707 8200 Telephone

December 15, 2016
TO: Herb Berger Central Office NC UST Section

RE: Health Risk Evaluation Incident # 14151 Smiths Grocery Howard Bowman Well Sampling Results, WSW-4
2040 NC 704 Hwy East
Lawsonville, Stokes County During this sampling event, eleven 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 household uses, such as showering, bathing, washing dishes, flushing toilets, and hand washing. The chart
below compares the detected contaminant concentrations with the applicable standard:

Sample ID Contaminant Concentration (µg/l)* MCL (µg/l) 2L (µg/l)
93222014001 Benzene 68.8 5
1,2-Dichloroethane 3.2 5
Diisopropyl ether 138 70
Isopropylbenzene 2.1 70**
Methyl tertiary butyl ether 1.2 20
Naphthalene 7.1 6***
n-Propyl benzene 0.57 70
1,2,4-Trimethylbenzene 27.4 400
1,3,5-Trimethybenzene 4.9 400
m,p-Xylene 27.1 10,000
o-Xylene 22.6 10,000
Shaded boxes indicate a standard has been exceeded.
* The abbreviation µg/l stands for micrograms of contaminant per liter of water and is roughly equivalent to parts per billion.

** This value is based on odor, the health based value is 700 ug/L.
*** This value is based on odor, the health based value is 100 ug/L.
RECOMMENDATION: The benzene and diisopropyl ether concentrations exceed the applicable
standards. In addition, the benzene concentration exceeds the level that would be considered safe for other household uses. Therefore, this water is not recommended for any residential use at this time.

Hanna Assefa, Environmental Toxicologist Division of Waste Management, NCDEQ