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�.1 <br /> Preliminary Report <br /> Underground Fuel Storage Tank Site Investigation <br /> Fu San Joaquin County <br /> Capital Projects Division <br /> Stockton, California <br /> ,,,, <br /> 1.0 INTRODUCTION <br /> The following preliminary report presents a soil and shallow <br /> groundwater investigation program designed by Roy F. Weston, Inc. <br /> �- (WESTON) to assess the extent of hydrocarbon residues at the San <br /> Joaquin County Human Services Agency construction site located at <br /> the intersection of San Joaquin Ave. and Washington Street in <br /> Stockton, California (Figure 1) . San Joaquin county is the owner <br /> of the site and the primary county contact is Mr. Richard <br /> Callistro of the capital projects division. <br /> This preliminary report addresses the installation and sampling <br /> „ of three shallow groundwater monitoring wells and the gathering <br /> and analysis of soil samples from several locations. All of <br /> these activities are to occur within the one block construction <br /> area with focus being on the southeast corner of the site from <br /> which nine fuel tanks were recently removed. All of the work <br /> detailed within this report will be conducted under the supervi- <br /> sion of a registered geologist. <br /> 2.0 BACKGROUND <br /> During the time period of April through May 1968, a total of nine <br /> underground fuel storage tanks were removed from the southeast <br /> corner of the Human Services Agency construction site bounded by <br /> Market, San Joaquin, Sutter and Washington Streets in downtown <br /> Stockton. The nine tanks were residual tanks from a gasoline <br /> service station which had previously been located at the site. <br /> The tanks consisted of two unleaded gasoline tanks, three leaded <br /> gasoline tanks, one waste oil tank and three sand filled aban- <br /> doned tanks (contents unknown) . The locations of these tanks <br /> within the construction site are shown on Figure 2. <br /> After each tank removal, the soils beneath the tank were sampled <br /> and analyzed for various analytical, parameters. Section 4.0 of <br /> r this report provides additional details regarding the tank sizes <br /> and analytical parameters. <br /> The analytical results for the soil samples taken from beneath <br /> the tanks revealed significant concentrations of total petroleum. <br /> hydrocarbons. Additionally, concentrations of certain volatile <br /> compounds (Benzene, Touluene, Xylene) associated with gasoline <br /> where found to be above San Joaquin County Health acceptable <br /> limits. (Table 1) . <br /> kms-f <br /> f <br />