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� s �- .� �", �, wF•.. � y"�" -4 .was/a, � r w' „� b . <br /> k4iI:LEINFELDER <br /> �. 2 BACKGROUND <br /> The Nomellini Construction facility is at 1045 West Charter Way, Stockton, California <br /> (Plate 1). On August 25, 1988, a 550-gallon waste eil tank was excavated and two 1,000 <br /> gallon fuel tanks (containing regular and unleaded gasoline) were excavated from a <br /> separate site. The tank reported to ,store unleaded gasoline may also have held kerosene. <br /> Analytical results of soil samples collected beneath the tanks indicated that petroleum <br /> hydrocarbons and gasoline related constituents were present in the soil beneath the two <br /> 1,000 gallon tanks. Constituents were detected below levels of concern in the sample <br /> collected beneath the waste oil tank. Results of this investigation were presented ;n a <br /> Kleinfelder report dated September 22, 1988. <br /> On November 9, 1988 additional soil was removed from the fuel tanks;excavation to further <br /> assess the extent of petroleum hydrocarbon. contamination. One section of the excavation <br /> bottom was advanced from a depth of 11 feet to 19 feet below the ground surface. Soil <br /> samples were qualitatively screened in the field with an organic vapor detector. Organic <br /> _ vapor readings were detected at 408 parts per million by volume (ppmv) from a sample <br /> collected at a depth of 19 feet within the excavation and 740 ppmv from a sample collected . <br /> 10 feet away from the excavation at a depth of 16 feet. Based on the positive organic vapor <br /> truction decided to backfill the excavation and further <br /> screening results, Nomellir i Cons <br /> assess the extent of contamination with a soil boring program. <br /> Nomellini Construction authorized Kleinfelder to conduct a preliminary investigation to <br /> assess the lateral and vertical extent of contamination in the vicinity of the removed storage <br /> tanks. A work plan to conduct the assessment was submitted to the SMID in November <br /> _ of 1988, and an approved boring permit was received from the SJLHD on January,26, 1989 <br /> {Appendix A). This report describes the field activities and analytical results associated <br /> with the preliminary soil investigation. <br /> 188-89-960 2 <br />