The contaminant plume extended beneath a residential neighborhood, posing a potential threat to potable water supply wells in the area and a vapor intrusion risk for nearby residences having a basement or subsurface crawl space. Technical assistance provided by Farallon included development of indoor air sampling procedures and installation of subslab depressurization systems for residences where concentrations of TCE posed a potential health risk. Farallon also attended public neighborhood association meetings where results from the indoor air sampling, investigation, and cleanup activity were presented. Successful negotiation of a settlement on behalf of the insurance carrier was reached.