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' GROUNDWATER MONITORING REPORT <br /> April 1993 <br /> Babka Distributing <br />' 1149 West Weber Avenue <br /> Stockton, California <br />' 1. 0 INTRODUCTION <br /> In accordance with a request from the Bank of Stockton, owner of <br />' the site, personnel from Geological Audit Services, Inc. (GeoAudit) <br /> have performed quarterly groundwater monitoring procedures at 1149 <br /> West Weber Avenue in Stockton, California (the site) for the first <br /> quarter 1993 . The project background, procedures, findings and <br /> conclusions are presented in the following sections. The site <br /> location is presented in Figure 1. A plan of the site is presented <br /> in Figure 2 . <br /> 2 .0 BACKGROUND <br />' 2.1 Site Location <br />' The site is located in a flat industrial area in the Port of <br /> Stockton (Figure 1) . There is a large warehouse, a small metal <br /> storage unit, a large asphalt-paved parking area, and a rail spur <br /> on the property. The property was the site of Babka Distributing, <br />' a beer distributorship, until 1989 and was vacant from 1989 to <br /> 1992 . The property is currently used by the World Wildlife Museum <br /> for storage. <br />' 2.2 Site History <br />' One 10, 000 gallon gasoline tank and one 3 , 000 gallon diesel tank <br /> were installed at the site in 1972 . The tanks were used to fuel <br /> delivery trucks. Both underground storage tanks were removed from <br /> the site by Jim Thorpe Oil Company in April 1991. Diesel and <br />' gasoline contamination were detected in soil samples collected <br /> beneath the tanks. The Bank of Stockton was directed by San <br /> Joaquin County Public Health Services - Environmental Health <br />' Division (PHS/EHD) to perform an assessment of the lateral and <br /> vertical extent of the contamination. <br /> Falcon Energy Associates, Inc. was retained to excavate the <br />' contaminated soil, and GeoAudit, was contracted to supervise the <br /> excavation and collect soil samples. A Site Contamination workplan <br /> to excavate the contaminated soil and install groundwater <br /> monitoring wells was submitted in December 1991, and excavation <br /> began in January 1992 . The excavation covered an area of <br /> approximately 55 feet by 17 feet and extended to a depth of 14 <br />' feet. Groundwater entered the excavation during soil removal, and <br /> stabilized at a depth of approximately 12 feet. Soil samples were <br /> 1 <br /> 1 <br />