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Extended Site CliaracterizaHOK Report: 7500 West Eleventh Street, Tracy, CA. Page 2 2.0 BACKGROUND 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. The property is also 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. 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 a 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 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. 2001f). The restaurant on the property remains in operation and is leased from the Navarras by Able Manzilla Mendoza and Guadeloupe Contrecias, et ux, (the Mentdozas) 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. ` - On December 9, 1998, eight underground fuel storage tanks and six thousand linear feet of associated piping were removed from the property under the permit and oversight of the SJCEHD (Dietz Irrigation 1999). The former locations of the fuel tanks are shown on Figure 2. When the tanks were removed, 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 also shown on Figure 2. Figure 3 shows the location of pits at the former sites of the underground tanks and excavations that were _? made to remove piping from the ground, excavate affected soil from beneath the former location of the fueling station's pump islands and remove floating product that had flowed from that area into one of the tank pits. Following removal of the tanks and piping, The San Joaquin Company Inc. (SJC) E prepared a site characterization work plan (The San Joaquin Company Inc. 1999) and submitted to the SJCEHD for review. The planned scope of the site characterization was, unfortunately, limited in its aerial extent and in other respects by restrictions imposed by the SJCEHD and the California Underground Storage Tank CIeanup Fund (USTCF) I (California Underground Storage Tank Cleanup Fund 2000)• Consequently, important elements the site characterization work, including the drilling of exploratory borings and i SJC f k