Laserfiche WebLink
all eight borings drilled for this assessment Toluene, ethyl benzene, total <br /> xylenes and MTBE concentrations also exceeded DHS MCLs for drinking <br /> water in groundwater samples collected from several of the borings <br /> Based on the groundwater flow direction at neighboring properties, the <br /> groundwater flow direction at the site is likely to the northwest <br /> In December 1998, three 8,000-gallon gasoline USTs and their associated <br /> dispensers and piping were removed from the site Approximately 300 <br /> tons of contaminated soil were excavated in the process and later <br /> disposed of off-site at the Forward Landfill During the UST removal <br /> operations, samples were collected from the excavation, pipe trenches, <br /> stockpiles and water within the pit Soil samples collected within the <br /> excavation contained up to 33 ppm TPH-G, 0 076 ppm benzene, 0 72 p p m <br /> toluene, 0 52 ppm ethyl benzene, 3 ppm xylenes and 0 71 ppm MTBE Soil <br /> samples collected within the piping trenches contained up to 160 p p m <br /> TPH-G, 0 6 ppm benzene, 1 ppm toluene, 22 ppm ethyl benzene, 220 p p in <br /> xylenes and 2 5 ppm MTBE Soil samples collected from the stockpiles <br /> contained up to 470 ppm TPH-G, 0 75 ppm benzene, 21 ppm toluene, 7 1 <br /> ppm ethyl benzene, 44 ppm xylenes, 10 ppm MTBE and 6 5 ppm tertiary <br /> butanol (TBA) The groundwater sample collected from the UST <br /> excavation contained 66,000 ppb TPH-G, 2,700 ppb benzene, 10,000 p p b <br /> toluene, 720 ppb ethyl benzene, 12,000 ppb xylenes and 28,000 p p b <br /> MTBE <br /> y <br /> In early 1999, two 10,000 gallon USTs were installed at the site in a <br /> different location on the property from the previous USTs New lines and <br /> dispensers were also installed The site is currently operating as a Unocal <br /> 76 Station <br /> 3 . 0 PROPOSED SCOPE OF WORK (SOW) <br /> Based on the site history and discussions with Mr Harlin Knoll of the San <br /> Joaquin County PHS-EHD, ASE has developed the following scope of work <br /> to provide necessary data for the site assessment The proposed SOW is as <br /> follows <br /> 1 } Prepare a workplan for review and approval from the San Joaquin <br /> County PHS-EHD <br /> 2 ) Obtain the necessary drilling permit from the San Joaquin County <br /> PHS-EHD <br /> i <br /> 574 West Grant Line Road Report — October 2000 <br /> -2 <br />