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4 4.)IN . UST and Product Line Replacement-Tosco 76 Branded Facility No 11193,Stockton,CA nl 12,1999 bgs Per the direction of Ms Lagono, four additional soil samples, labeled D1-2-10 5 through D4-2- 10 5, were collected from the base of over-excavated areas at approximate depths of 10 5 feet bgs Native soil consisted primarily of sand and silty sand Moisture was observed in soil sample D3-2- 105 The four soil samples were analyzed for TPHg, BTEX and MtBE TPHg was not detected in three of four soil samples, and was detected in sample 133-2-10 5 at a concentration of 29,600 ppm MtBE (EPA 8020) was not detected in sample D3-2-10 5, and was detected In the other soil samples at concentrations ranging between 0 172 and 5 09 ppm Stockpile Sampling On December 11, 1998, five composite soil samples (CompA through CompE) were collected for disposal characterization from approximately 500 cubic yards of stockpiled soil generated from the gasoline UST excavation On December 22, 1998, one composite soil sample (Comp-PT) was collected from approximately 90 cubic yards of stockpiled soil generated from the piping trenches On December 29, 1998, one additional composite soil sample (SSPT1-A,B,C,D) was collected from approximately 100 cubic yards of stockpiled soil generated from the product piping trenches during over-excavation activities • All composite soil samples were analyzed for TPHg, BTEX, MtBE, and total lead The analytical results of the composite soil samples were within limits acceptable to the landfill Analytical results are summarized in Table 1 SOIL DISPOSAL On December 16, 1998, and January 4, 1999, Manley & Sons Trucking, Inc of Sacramento, California, removed soil stockpiles (represented by samples CompA through CompE, Comp-PT, and SSPT1-A,B,C,D) from the site and transported a total of 1073 52 tons of soil to the Forward, Inc disposal facility in Manteca, California Copies of soil disposal documentation are attached WATER DISPOSAL On December 7, 1998, one composite groundwater sample was collected from two groundwater monitoring wells (MW-1 and MW-2) adjacent to the gasoline UST pit The water sample was collected to characterize water to be pumped from the UST pit to depress the water table during the installation of new USTs The sample was analyzed to satisfy acceptance requirements for water treatment at the Tosco Refinery in Rodeo, California The sample was analyzed for static hazardous abbreviated screen bioassay (fish bioassay), Organochlorine Pesticides and PCBs (OP&PCBs), Volatile Organic Compounds (VOCs), reactivity, corrosivlty, lgnitabllity (RCI), total sulfides, total 14020502 4