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Subsurface Investigation Report,Tosco(Former BP) Service StahonNo 11192 <br /> June 8 2001 <br /> southeast portions of the site and offsite to the south Based on these results, GR will propose the <br /> installation of additional groundwater monitoring wells in the vicinity of the site In addition, GR <br /> recommends that joint groundwater monitoring and sampling be conducted with the former Shell <br /> site to utilize data from their existing monitoring well network to the east of the Tosco site <br /> The highest concentration of MTBE found during this investigation was to the grab groundwater <br /> sample collected at 75 feet bgs to CPT-1 Despite precautions used in advancing CPT-1, cross- <br /> contamination from shallow MTBE-impacted groundwater may be the source of the MTBE <br /> concentrations observed in CPT-1 In addition, grab groundwater sample results may not be <br /> representative of actual groundwater conditions Therefore, GR will propose the installation of one <br /> deep groundwater monitoring well in the vicinity of CPT-1 to further assess the groundwater <br /> conditions at the depth of 75 feet near CPT-1 A work plan for the deep monitoring well, and the <br /> aforementioned shallow monitoring wells will be submitted to the PHS-EHD within 30 days of the <br /> date of this report <br /> x <br /> 140245 03 3 <br /> 7 <br />