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Additional Site Assessment Report 2 . The Southland Corporation,Store#1'7334,4501 North Pershing Avenue,Stockton,CA January 15, 1998 e From the samples collected from the borings drilled on February 20, 1997, benzene was detected In soil sample GP-4-17'at a concentration of 0 0095 milligrams per kilogram (mg/kg) Total petroleum hydrocarbons as gasoline(TPH-G)was not detected in any of the soil samples collected The highest methyl-tert-butyl ether(MTBE) concentration was reported in sample GP-1-15'at 0 76 mg/kg Presence of MTBE was confirmed by EPA method 8260 in the same sample at 0 91 mg/kg The highest dissolved benzene, MTBE, and TPH-G concentrations in groundwater samples collected February 20, 1997,were reported In sample GP-4 at 9,100 micrograms per liter(pg/L), 100,000 pg/L, and 150,000 pg/L, respectively Presence of MTBE was confirmed by EPA method 8260 in the same sample at 84,000 pg/L(Table 2) 3 0 SOIL AND GROUNDWATER ASSESSMENT WORK 3.1 Penn Min g/Site-Specific Health and Safety Plan Fluor Daniel GTI conducted a technical review of all relevant Information provided before proceeding wrth sde assessment work Permits for the on-site sod bonngs were not required by the SJCPHS for the Installation of the four on-site groundwater monitoring wells since permrts had already been Issued for the Initial site Investigation conducted on February 20, 1997, however a permit was required and obtained from the SJCPHS for the one off-site boring In addition, a Revocable Permit and an Encroachment Permit for the installation of the off-site groundwater monitoring well (MW-4)were obtained from the City of Stockton Public Works Department(Appendix A) Following a complete review of site conditions, Fluor Daniel GTI revised the wasting sde-specific Health and Safety Plan as required by the Occupational Safety and Health Administration (OSHA)Standard "Hazardous Waste Operations and Emergency Response"guidelines (29 CFR 1910 120) The document was reviewed and signed by all Fluor Daniel GTI personnel and subcontractors prior to commencement of work at the site 3.2 Soil Borings On September 23 and 24,and November 25 and 26, 1997, Fluor Daniel GTI supervised the drilling of one off-site and four on-site soil bonngs to depths ranging from 35 to 40 feet below ground surface (BGS) utilizing a truck-mounted drill ng equipped with 8-inch outside-diameter(O D) hollow-stem augers All drilling equipment was steam cleaned prior to drilling each boring,and sampling equipment was washed in an Alconox(detergent)solution and rinsed with water between sampling intervals All sod and steam-clean water generated during the drilling was placed in labeled Department of Transportation (DOT)-approved 55-gallon drums and left on site pending transportation and disposal . 173+ar rpt FLUOR DANIEL GTI