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i <br /> It is unknown what was stored in the sheds and transported from the loading terminals. By the <br /> r early 1950s, the Stockton Channel was covered by an aboveground parking lot and by a portion <br /> _ of the former Shell gasoline service station building. The service station was later operated by <br /> the Bridgestone Tire automobile repair facility. <br /> Potential off--site sources identified include: <br /> North of Weber Block <br /> • a former gasoline service station/automobile dealership on the northeast corner of El <br /> Dorado Street and Channel Street; a former insecticide manufacturing facility; two former <br /> automobile repair shops; and.a former machine shop. <br /> South of WeberBlock <br /> • a'former Standard gasoline station; a former print shop; a former fertany; and <br /> ilizer comp <br /> former "industrial tracks" (railroad tracks) on traversing Weber Avenue. <br /> East of WeberBlQck <br /> • former Goodyear Tire and Auto Repair facility. <br />{ <br /> West of Weber Block <br /> • former ARCO gasoline service station., <br /> 2.4 Previous Investigations <br /> t Subsurface soil samples were collected during 1985 as part of the initial investigation of potential <br /> contamination associated with the former Shell gasoline service station. Additional subsurface <br /> soil samples and groundwater samples were collected during several quarterly monitoring events. <br /> Refer to Tables 1 and 2 and Plates 2, 3, and 4 in Appendix E for a summary of previous soil and <br /> groundwater results for the former gasoline service statior.L The areas sampled are limited to the <br /> areas shown by sample locations in Figure 2-3. <br /> One used oil underground storage tank (UST) and four 4,000-gallon steel gasoline USTs were <br /> installed at the site in 1955. In 1963, one 4,000-gallon gasoline UST was removed and two <br /> 7,500-gallon USTs were installed at the site. The remaining USTs (three 4,000-gallon USTs and <br /> two 7,500-gallon USTs) were removed in 1981 and the used oil UST was removed in 1991. <br /> Releases of petroleum hydrocarbon contamination have impacted the soil and groundwater. <br /> Remedial efforts via soil vapor extraction 'and groundwater extraction have occurred on the <br /> northeast portion of the site. In 1992, Shell began soil vapor extraction remediation at the former <br /> service station to remove residual petroleum hydrocarbons from soil and groundwater. In 1993, <br /> { nA362101985APlwebsap2.wp5 WEBER BLOCK (Area 9) Sampling and Analysis Plan 0 <br /> Page 4 <br /> h <br />