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• Appendix A - Historical Background <br /> River City Petroleum and Connell Motor Lift Truck <br /> Page 2 of 13 <br /> SITE OPERATIONS <br /> The site has been utilized as a lift truck(forklift) service facility from 1947 to approximately 1970, <br /> a commercial tire service facility from 1970 to 1988,and a commercial lubrication(oil)service from <br /> 1988 to 1994. Since 1994 the facility has only been used as a as a commercial tire service facility. <br /> The eastern side of the site was formerly a fuel card-lock station,the River City Petroleum Company, <br /> located in the canopy area fronting North Wilson Way.This commercial diesel and gasoline fueling <br /> operation utilized underground storage tanks (USTs) for fuel storage. <br /> HISTORICAL CHEMICAL USAGE <br /> There have been hazardous materials or wastes generated on the property, namely waste oil, <br /> antifreeze, brake solvent, paint and asbestos used in brakes. One large, half-full AST utilized for <br /> waste oil was noted outside on the west side (project area) of the building; this AST was located <br /> within a concrete bunker.Staining was present,surrounding both features.In addition,a set of empty <br /> • aboveground storage tanks(ASTs)utilized for waste oil were noted inside the building;these ASTs <br /> were likely underground storage tanks(USTs)removed from within the warehouse or lube bay area. <br /> Some of the present and former occupants, such as the various trucking/equipment/automotive <br /> companies (petroleum hydrocarbons lubricants and oils) and the paint shops (resins, chlorinated <br /> solvents)may have utilized hazardous materials;however,historical volume and disposal practices <br /> for the hazardous materials or wastes at the site are unknown to AGE. <br /> UST FACILITY <br /> The UST investigation presently being conducted on the eastern portion of the site by Foothill <br /> Engineering (FE) was assigned to the Local Oversight Program (LOP) of San Joaquin County <br /> Environmental Health Department(EHD)for assessment and potential remediation.A history of the <br /> UST removal and investigation is as follows: <br /> • Four 10,000-gallon underground storage tanks of unknown installation dates, UST <br /> Numbers 1 and 2(gasoline),and UST Numbers 3 and 4(diesel),were removed from the site <br /> on 05 October 1986; it was unknown if an unauthorized release of hydrocarbons had <br /> occurred at the site at that time. Three new double-wall, 10,000-gallon USTs with alarm <br /> sensors were installed on 07 November 1986(UST Numbers 5 (diesel),6 and 7(gasoline)). <br /> • UST documentation notes the presence of two 500-gallon waste oil tanks(UST Nos 8 and 9). <br /> • The location of the UST was documented to be at the south and north ends of the truck lube <br /> Advanced GeoEnvironmental,Inc. <br />