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r e' a '• 1 pr � -C� . '� � ;I` � ,.' ° _ ,N � ;�1 � � '?.'r.�� ��tti�-fir i <br /> F <br /> P yG <br /> iF <br /> KLEINFELDER <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 oil tank was removed for one excavation <br /> and two 1,000 gallon fuel tanks (regular and unleaded gasoline) were excavated from an <br /> adjacent excavation. The tank reported to store unleaded gasoline may have held <br /> kerosene. Analytical results of soil samples collected beneath the tanks indicated that <br /> petroleum hydrocarbons and gasoline related constituents were present in the soil beneath <br /> the two 1,000 gallon tanks. Constituents were detected below levels of concern in the <br /> sample collected bene-7th the waste oil tank. Results of this investigation were presented in <br /> a Kleinfelder report dated September 22, 1988. <br /> On November 9, 1958 additional soil was removed from the fuel tank excavation to further <br /> assess the extent of petroleum contamination. One section of the excavation bottom was <br /> advanced from a depth of 11 feet to 19 feet. Soil samples were qualitatively screened in the <br /> field with an organic vapor detector. Organic vapor readings were detected at 408 parts <br /> per million by volume (ppmv) from a sample collected at a depth of 19 feet within the <br /> excavation and 740 ppmv from a sample collected at a depth of 16 feet, 10 feet away from <br /> the excavation. <br /> Based on the organic vapor screening results, Nomellini Construction decided to further <br /> assess the lateral and vertical extent of contamination with a soil boring program. In May <br /> 1989 soil samples were collected for laboratory analysis from nine borings drilled in the <br /> vicinity of the former tank excavation. High concentrations of petroleum hydrocarbons <br /> were detected in the shallow soil near the former tanks and near the ground water surface <br /> in several of the borings. Findings of the soil boring assessment are presented in <br /> Kleinfelder's report "Nomellini Construction, Preliminary Soil Assessment Report, <br /> Stockton,California"Oated June 14, 1990. <br /> F13-90-66 2 <br />