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SECTION 1 <br /> IIV 71 R OD UCTION <br /> This document is the workplan for a limited soil and groundwater <br /> investigation of a site located at 1515 West Weber Avenue, Stockton, <br /> San Joaquin Countv, California t1'igure 1-1). <br /> Tank History <br /> The proposed work site consists of a former underground storage <br /> tank that was situated immediately adjacent to a warehouse. <br /> According to presently available records, the fuel tank had a capacity <br /> of 2000 gallons and was used for the storage of gasoline. :age of the <br /> tank is unknown. The tank was reportadly of single wall steel <br /> construction. The tank was removed for Santa Fe Pacific <br /> Franc scow <br /> Company` through their agent EHJ� Construction, <br /> SanCalifornia by North Cal Construction, Stockton, <br /> California in <br /> November 1988. At the time of removal a hole was reported at the <br /> southern end of the tank. There is no information available to <br /> indicate the quantity of product that escaped from the tank. Samples <br /> of soil and water removed from the tank excavation indicated the <br /> presence of gasoline and fuel components benzene, toluene, <br /> ethylbenzenes,and xylenes (Table 1-1). <br /> Resuits of Previous Investigations <br /> Prior work by Meinfelder. Inc. in November 1990, partially <br /> characterized the horizontal <br /> wdepth <br /> Theirextent <br /> warkf the petrolcuI� <br /> also established <br /> products in the soils and groundater <br /> the local groundwater flow direction and gradient, and characterized <br /> the site-specific geology. <br /> i <br /> HIeinfelder conducted their investigation by initially completing a <br /> survey <br /> through 'Tracer Research Corporation. The then--- <br /> was performed by forcing a hollow tube--to-various- ep <br /> withdrawing eitherandsoil-gas <br /> il g s o a on of resultso arenpresented alysislin <br /> sample locations <br /> 11 <br />