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`1Woodward-Clyde <br /> 6r <br /> Ms. Linda Turkatte <br /> Lr <br /> San Joaquin County Environmental Health Division <br /> August 5, 1996 <br /> ,r Page 2 <br /> V <br /> Geomorphic Province. This geomorphic province is characterized by a network of alluvial fans <br /> that form a relatively flat basin. <br /> Lr <br /> Tank Removal Activities <br /> On November 12, 1993, one UST which formerly contained diesel fuel, was removed from the <br /> KJAX site. The 1000-gallon steel UST installed in 1964 was approximately 4-feet in diameter <br /> and 11-feet in length. The UST had been out of service since the mid 1980s. Upon the <br /> 6' removal of the UST, one small hole was observed on the bottom of the tank beneath the fill end <br /> (north end). Approximately 18 cubic yards of diesel contaminated soil were excavated during <br /> the tank removal and were transported to Forward Incorporated Landfill of Manteca, California <br /> 6m under non-hazardous waste profile #493701. Confirmatory soil samples were collected from <br /> the excavation below the tank and piping areas. <br /> The excavation was lined with a polyethylene sheeting, placed on the floor of the excavation <br /> pit. The lined UST excavation was backfilled with imported sand and pea gravel, and clean <br /> 60 excavated material. The imported backfill materials were placed above the polyethylene <br /> sheeting to approximately 10-inches bgs. The excavation was completed to surface grade with <br /> clean excavated soil. <br /> V <br /> Analytical results of the confirmatory soil samples indicated that the south end of the excavation <br /> and piping areas were free of contamination. The sample collected from the north end of the <br /> excavation, at approximately 18 feet bgs, contained detectable concentrations of total petroleum <br /> hydrocarbons (TPH) as diesel at 9,000 mg/Kg. An "Analytical Results Report" describing the <br /> removal of the FEMA-owned UST at the KJAX site was prepared by WCFS in May, 1994. A <br /> site characterization was conducted in response to a letter to FEMA from SJCEHD dated <br /> December 27, 1993. <br /> y Site Characterization Activities <br /> Site characterization activities were conducted from May 25 through June 22, 1995 to assess the <br /> lateral and vertical extent of diesel contaminated soil in the vicinity of the former UST. <br /> , <br /> Investigative activities included advancing seven soil borings. Five soil borings (B-1, B-2, 13- <br /> 6w <br /> V <br /> V <br />