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y 6P l 2.0 INTRODUCTION 2.1 Background and Previous.Investigations The ST&E site is located at a street address of 2582 Shaw Road and is located outside the city limits of Stockton. This site is located within the San Joaquin River Basin as depicted on Figure 1. The site is contained within the Eastern San Joaquin groundwater subbasin(Figure 2). The Site is located immediately adjacent to the east side of the city of Stockton within the unincorporated portion of San Joaquin County(Figure 3). A topographic map of the site is depicted as Figure 3. The site is.located within the Stockton East Water District service area The ST&E was established in 1908 as a railroad that served the cities of Stockton and Linden, California. SME is currently identified as a public utility serving twenty five rail customers in Stockton, California. The ST&E locomotive shop is located at 1282 North Shaw Road and was constructed in 1973Fi e. ) plans 4 . 'The ST&E: on continuing tooperate from this location for ( 1�' the foreseable future. k In November 1998, one 10,000 gallon diesel underground storage tank was removed from the locomotive shop by Bowen Construction(Figure 5). During the tank removal, contaminated soil E was observed at the base of the tank excavation, and diesel hydrocarbons were reportedly detected in soil samples collected from the UST excavation floor(Figure 5). The tank was 'E reportedly disposed of at the Erickson, Inc. facility located in Richmond, California. E I In order to support the UST removal and subsequent minor over-excavation to collect bottom samples at the former UST pit a reported 78 cubic yards of petroleum hydrocarbon contaminated i soil was excavated. This soil was reportedly stockpiled into two stockpiles adjacent to the E former UST pit(Figure 5). t i MainlDTnvironmenLa1115TE\WorkplanSWorkp Pan l 1192007.wpd 5 i 1 i