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Chevron Products Company 2 <br /> Chevron Service Station#9-2033 508 West Charter Way Stockton CA March 5 2002 <br /> On September 9, 1996, Touchstone Developments oversaw the excavation and removal <br /> of three USTs, three hydraulic hoists, product dispensers, and associated product lines <br /> Soil samples collected from beneath the former USTs, hydraulic hoists, product piping, <br /> and dispenser locations were analyzed for TPHg and BTEX Hydrocarbon <br /> concentrations reported for soil samples collected from beneath the former southern <br /> product island (P6) were 3,000 mg/kg TPHg, and 2 6, 20, 47, and 240 mg/kg BTEX <br /> components, respectively, at 3 5 feet bgs On September 11, 1996, soils near the former <br /> locations of the USTs, product dispensers, and product lines associated with these test <br /> results were removed by excavation Results for additional samples collected and <br /> analyzed following soil excavation suggest remnant hydrocarbon concentrations <br /> underlying the former southern product island of 1,700 ppm TPHg and 3 2 ppm benzene <br /> at 6 feet bgs, and 1,300 ppm TPHg and 14 ppm benzene at 7 feet bgs west of the <br /> southern product island <br /> Data collected during the previous investigations suggests a complex sequence of <br /> interbedded fine-grained and sandy layers comprise the top 95 feet of the soils and <br /> unconsolidated sediments beneath the site Groundwater appears to be present in two to <br /> three water-bearing zones underlying the site The upper water-bearing zone suggests <br /> the groundwater flows to the east—northeast under a hydraulic gradient of 0 005 ft/ft <br /> Groundwater in the uppermost water-bearing zone appears confined or semi-confined <br /> by overlying fined-grained mixtures Field observations suggest groundwater rose up to <br /> . 25-feet above the level encountered in borings <br /> 11Chevron1920331REPORTSI9-2033 SA CPT WPFA doc <br />