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1 <br /> PRELIMINARY INVESTIGATION AND EVALUATION REPORT <br />' Babka Distributing Co. <br /> 1149 W. Weber Ave. <br />' BACXGROUND <br />' The site is located in a flat industrial area in the Port of <br /> Stockton (Figure i Location Map, 7 . 5 Minute Stockton West <br /> Quadrangle, USGS Topographic Map Series, 1976) . There is a large <br /> warehouse, a small metal storage unit, a large asphalt-paved <br /> parking area, and a rail spur on the property. The property was the <br /> site of Babka Distributing, a beer distributorship, until 1989 . The <br /> property has been vacant since 1989. <br /> One 10, 000 gallon gasoline and one 3 , 000 gallon diesel tank were <br /> installed at the site in 1972 (Figure 2 - Site Plan) . The tanks <br /> were used to fuel the delivery trucks. <br /> Both underground storage tanks were removed from the site by Jim <br /> Thorpe oil Company in April 1991. Diesel and gasoline contamination <br /> were detected in soil samples collected beneath the tanks. The Bank <br /> of Stockton was directed by San Joaquin County Public Health <br /> Services - Environmental Health Division (PHS/EHD) to perform an <br /> Iassessment of the lateral and vertical extent of the contamination. <br /> Falcon Energy Associates, Inc. was retained to excavate the <br /> contaminated soil, and Geological Audit Services (GeoAudit) , Inc. <br />' was contracted to supervise the excavation and collect soil <br /> samples. A Site Contamination Workplan to excavate the contaminated <br /> soil and install groundwater monitoring wells was submitted in <br /> I December 1991, and excavation began in January 1992 . Monitoring <br /> wells were installed in May 1992 . <br /> EXCAVATION & SOIL SAMPLING <br /> Excavation of the contaminated soil took place on 16, 17 and 18 <br /> January and 3 February 1992 . The excavation was preformed by <br /> representatives of Falcon Energy Associates. <br /> An excavator was used to remove approximately 700 - 800 cubic yards <br /> of soil from the former tank cavity. A photo-ionization detector <br /> was used to screen the excavated soil and direct the excavator <br /> (PID: Thermo Environmental 580A, 10. 0 eV, calibrated to <br /> isobutylene) . The soil was then stockpiled on the asphalt ad3acent <br /> to the excavation and covered with plastic. <br /> Soil was excavated to a depth of 14 feet. Groundwater entered the <br /> excavation during soil removal, and stabilized at a depth of <br /> approximately 12 feet. <br /> L <br />