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Report:Groundwater-quality Monitoring—Jul y 29,2002: 7500 West Eleventh Streel, Tracy, CA. Page 2 ' 1.3 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. (Note: Since it was last issued in April 2002, the base map for Figure 2 has been modified to show the location of a new water-supply well on the property at 7601 West Eleventh Street that was completed on August 2, 2002.) 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 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. 2001 d). The restaurant on the property remains in operation and is leased from the Navarras by Able Manzilla Mendoza and Guadeloupe Contrecias et ux (t he Me ndozas ) 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 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. 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. At the same time that the tanks were removed from the site, soil heavily affected by fuel hydrocarbons was excavated from beneath the pump island area and 521.25 tons of that material was 3 disposed off-site at a permitted facility (Dietz Irrigation 1999a). In addition, some 2,000 gallons of floating product and affected groundwater were removed from the subsurface by pumping from a tank pit into a vacuum truck which was used to transport it to a permitted recycling facility. An initial phase of site characterization work was completed in May 2000. It included the i installation of 7 groundwater-quality monitoring wells (Nos. MW-1 through MW-7) at 1 sic