The soil borings and wells were installed using direct push methods. Twenty-six test pits were also installed throughout the site to evaluate soil quality. Groundwater samples were collected from the installed monitoring wells and private water supply wells in the vicinity. Select soil and groundwater samples were analyzed for one or more of the following: volatile organic compounds, semi-volatile organic compounds, priority pollutant metals, polychlorinated biphenyls, gasoline range organics, and diesel range organics.
The primary contaminants of concern that were detected at the site included gasoline range organics and diesel range organics in soil, and tetrachloroethane and diesel range organics in groundwater. Semi-volatile and volatile organic compounds, and polychlorinated biphenyls detected in soil do not appear to pose a threat to human health or the environment. Metals detected in soil and groundwater were either within site background levels or below regulatory standards and were also not considered a threat to human health or the environment.
Recommendations following the investigations included restricting the use of groundwater onsite for drinking water, addressing proper closure of an inactive deep supply well onsite, continued monitoring of groundwater for any concentration trends, and characterizing and properly disposing of any debris encountered during excavation for any future development of the property.