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f„r Work Plan for Refined Plume Definition and Management of Floating Product-7500 W I1 th St., Tracy, CA. Page 2 2.0 BACKGROUND The history of ownership of the 7500 West Eleventh Street property, including a record of the owners and operators of the truck fueling station formerly located on the site, together with a description of the events that lead to discovery of an unauthorized release of fuel hydrocarbons to the subsurface and the subsequent phases of remediation that have been ,.� completed to date are summarized below. 2.1 Ownership History of Site and Fueling Station The property at 7500 West Eleventh Street was used as a fueling station for trucks and other vehicles from circa 1930 until 1998. Over that period, the station was owned and operated .,• by a number of entities. Mr. Carl B. Navarra and Mrs. Annamae F. Navarra, et ux (the Navarras) purchased the property on October 31, 1979 from Ms. Meridall Sue Tiago, the widow of Joseph L. Tiago, Jr. In 1980, Jack Anastasio and Jim Meservy leased the property. For the following two years it was leased from the Navarras by Charles L. Profito (d.b.a. C & M Truck Service). Jeri Fisher (d.b.a. Tracy Auto/Truck Plaza) leased the property from January 1, 1983 until January 31, 1992. Starting on February 15, 1992, the property was leased by Mel Bokides Petroleum, Inc. (Bokides), and was subleased to Mr. Jodha Singh Gill and Mrs. Tirath Kaur Gill, et ux (the Gills) who operated the Olympian Service Station on the site. That lease and sublease were relinquished by Bokides and the Gills, respectively, in late 1998, .and the j Olympian station ceased operation. No fuel dispensing or service station operations have been conducted on the site since that time(The San Joaquin Company Inc. 2001g). The property is now the site of a restaurant and a disused public truck scale. The locations of the fueling station infrastructure, the restaurant, and the truck scale are shown on Figure 2. The restaurant on the property remained in operation until it was damaged by fire in June 2003. It is leased from the Navarras by Able Manzilla Mendoza and Guadeloupe Contrecias, et ux, (the Mendozas) who do business as the Casa Mendoza restaurant. In 2000, the Mendozas leased the rest of the site and plan to expand their business on the property. The restaurant is currently being reconstructed. 2.2 Removal of Underground Fuel Storage Tanks On December 9, 1998, eight underground fuel storage tanks and 6,000 linear feet of associated piping were removed from the property under the permit and oversight of the SJCEHD (Dietz Irrigation 1999a). The former locations of the fuel tanks are shown on Figure 2. 2.3 Completed Phases of Soil Remediation and Floating Product Removal When the underground fuel storage tanks were exhumed, it was found that fuel hydrocarbons had leaked from underground piping beneath the fuel pump islands of the former fueling station. The former locations of the fuel pump islands are shown on Figures 2 and 3. At the sic