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• <br /> INTERIM WORK PLAN <br /> FOR MONITORING "ELL INSTALLATION <br /> Cal-West Concrete Cutting <br /> 1153 Vanderbilt Circle <br /> Manteca, California <br /> January 1995 <br /> 1.0 INTRODUCTION <br /> In accordance with a request from Mr. Brick Joseph of Cai-West Concrete Cutting, <br /> Geological Audit Services, Inc (GeoAudit) has prepared this Intenm Work Plan for the <br /> installation of two groundw,iter monitoring wells at 1153 Vanderbilt Circle in Manteca, <br /> California (the site) The location of the site is illustrated on Figure 1 A plan of the site <br /> is illustrated on Figure 2 <br /> 2.0 BACKGROUND <br /> 2.1 Site Location <br />. Cal-West Concrete Cutting is located in a business/industrial park area of Manteca, <br /> California (Figure 1). The site is occupied by a single warehouse-type building and several <br /> other small storage sheds A municipal well is located on the property immediately west of <br /> the site. <br /> 2.2 Underground Storage Tank Removal <br /> It is our understanding that two underground storage tanks (USTs) were removed from the <br /> site on March 7, 1991- one 10,000-gallon diesel UST and one 5,000-gallon gasoline UST <br /> Four soil samples were collected from beneath the UST., at the Mime of removal The soil <br /> samples were analyzed for total petroleum hydrocarbons (TPH as gasoline and diesel) and <br /> purgeable aromatics (BTE&X) Analytical results of the soil samples indicated that an <br /> unauthorized release of both diesel and gasoline had occurred at the site. Additional soil <br /> was removed from the former UST excavation in 1991. However, analytical results (if any) <br /> from the overexcavation were not made available to GeoAudit <br /> 23 Monitoring Well Installation <br /> In a letter dated October 2, 1994, the San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS/EHD) stated that a groundwater investigation of the <br />