1. Cheshire Groundwater Contamination

State: CT

Site Lead: State

Date Deleted from NPL: July 2, 1997

Date of Last Five-Year Review: N/A

COCs: Many VOCs including trichloroethane (TCA), dichloroethene (DCE), tetrachloroethene (PCE), and xylenes

RAOs: Protection of human health and the environment; risk assessment results found risk was acceptable, between 1:10,000 and 1:1 million, and the hazard quotient was sufficiently low.

Technologies Applied: Soil excavation

Reported Results: Trichloroethane 3 µg/L, dichloroethane 14 µg/L, dichloroethene 0.9 µg/L, bis(2-ethylhexyl)phthalate 15 µg/L, bromodichloromethane 0.6 µg/L, dichlorobenzene 1 µg/L, dibromochloromethane 0.6 µg/L, tetrahydrofuran 5.2 µg/L, and toluene 1.4 µg/L. Concentrations greater than 10,000 µg/L for PCE, 3,500 µg/L for trichloroethene (TCE), and 5,000 µg/L for chloroform have been found in groundwater from location OW-1 at various times from June 1989 to February 1991.

MCLs Achieved? Yes

ICs in Place? None listed

Vapor Intrusion: Unclear. Soil vapor sampling was performed by a third party but results were inconclusive. Risk assessment for inhalation pathway of some contaminants found negligible risk.

Long-Term Monitoring? No


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