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Evaluation of Natural Attenuation: 7500 West Eleventh.Street, Tracy, C,4. Page 2 The restaurant on the property remained in operation until it was damaged by fire in June 2003, but it was restored and by June 2004, it had reopened for business. The restaurant is leased from the Navarras by Able Manilla 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 fueling station that had been located on the site ceased operation in 1998 and on December 9th of that year, 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 l 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 disposed ofd site at a permitted facility. 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(Dietz Irrigation 1999a). 1.3.1 Site Characterization Studies An initial site characterization investigation was completed in May 2000 that included installation of seven groundwater-quality monitoring wells, MW-1 through MW-7 (The r.-y San Joaquin Company 2001d). A second phase of site characterization was conducted in March and April 2002, during which eight additional groundwater-quality monitoring wells, numbered MW-3A, MW-313, MW-8 through MW-12, and MW-12A were installed 4 a (The San Joaquin Company 2002c). A third phase of site characterization was conducted in April 2004, during which seven additional groundwater-quality monitoring wells, numbered MW-13 through MW-19, and five floating product monitoring wells (MWFP- 1 through MWFP-5) were installed (The San Joaquin Company 20044). A total of 22 groundwater-quality and five floating product monitoring wells are currently extant at the site. 1.3.2 Groundwater-quality Monitoring The first round of groundwater-quality sampling and analysis at the Navarra Site was conducted on May 11, 2000, in association with the initial phase of site characterization (The San Joaquin Company 2001d). That sampling round used the seven wells that were initially installed on the site. Ten additional rounds of sampling and analysis were conducted between that date and July 30, 2003, with the rounds conducted in April, July and October 2002, and in January and April 2003, involving recovery of groundwater samples from all 15 wells that had been installed at the site by that time (The San Joaquin Company 2001c, 2001b, 2001a, 20024, 2002c, 2002b, 2002a, 2003e and 2003d). The sic