| This document provides a detailed report about a field study conducted by EQM/URS on behalf of EPA's National Risk Management Research Laboratory to characterize the subsurface contamination of volatile organic compounds (VOCs) at a Brownfield commercial site. The Triad approach was implemented to characterize the extent of soil, groundwater, and soil gas contamination. These data were used to assess impact on indoor air due to vapor intrusion. Seventy-seven soil samples, twenty-eight groundwater samples, and ten soil-gas samples were collected from Geoprobe(TM) borings and analyzed on-site by USEPA Method SW-846 8265 direct sampling ion trap mass spectrometry (DSTIMS). Additional SW-8260b and TO-15 analyses were performed on approximately 10% of the samples by off-site laboratories. Tetrachloroethylene (PCE), trichloroethylene (TCE) and cis-1,2-dichloroethylene (DCE) were detected in all media with PCE as the prevalent compound. |