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Q <br /> Geofogica:: (Technics inc. <br /> 2741'River Rand <br /> Mo koo,Cetfomia 95351 <br /> L (209)538-6424/$X1#53&5852 <br /> P <br /> Re p ort <br /> . <br /> Soil Investigation <br /> Arctic )lee <br /> 36 North'D Street <br /> Stockton, CA <br /> Project No. 691.2 <br /> December'10, 1998 <br /> 1.0 INTRODUCTION <br /> In'August 1998, Geological Technics Inc. performed Phase I Environmental Site Assessment . <br /> on'this property. During this assessment, it was discovered;that two underground storage <br /> tanks were located on this property that Arctic:Ice did not know about. It was recommended <br /> L <br /> that these tankg be removed under County supervision and permit. <br /> y <br /> On October 15; 1998, Geological Technics inc: and Del-Tech Geotechnical Support Services <br /> performed tank closure, removal and soil sample collection. work. Soil samples were <br /> L collected under the two underground storage tanks as directed by Letitia Briggs, RENS, the <br /> County inspector. The tests results show the following: <br /> 1. FUEL TANK — Located near the west entrance of the Quonset but building, TEPH-Diesel <br /> was found fat a depth of 10 feet bgs under the north end of the fuel tank at a concentration <br /> of 3300 mg/kg. TPH-G, BTEX, and the Oxygenated fuel compounds were not detected <br />! and lead was within expected concentrations for native soils of this region. <br /> L112.; WASTE OIL TANK — No contamination was found under the small'waste oil tank located <br /> 41 <br /> south Quoriset but and east of the fence/gate area. <br /> On December.;1, 1998, Geological Technics Inc.'and V&W.Drilling installed three boreholes <br /> to'a depth of 41 feet. Soil samples were collected and tested for TEPH-diesel at Sherwood <br /> labs. The enclosed report summarizes the work performed and the test results. <br /> 2.0 SOIL INVESTIGATION <br /> To investigate the vertical and lateral extent;of soil impacted with diesel range petroleum <br /> hydrocarbons discovered during closure of the diesel tank, Geological Technics Inc. drilled <br /> three boreholes to a depth of 41.5 feet below ground surface. These boreholes were located <br /> near the former diesel tank removed on October 15, 1998, on the northwest side of the <br /> L property. Refer to Figure.2: Site Map for well locations. One borehole was drilled near the <br /> 4 ' <br />