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Report:Groundwater-quality Monitoring—October 25, 2002: 7500 West Eleventh,Street, Tracy, CA. Page I 1.0 INTRODUCTION This groundwater-quality monitoring report has been prepared for the site of a former fueling station at 7500 West Eleventh Street, Tracy, California. The fueling station ceased operation in 1998, and, in December of that year, eight underground fuel tanks were removed from the property. At that time, it was found that soil and groundwater beneath the site were affected by fuel hydrocarbons. A site characterization investigation completed in May 2000 included installation of seven groundwater-quality monitoring wells (The 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 were installed(The San Joaquin Company 2002b). The first round of groundwater-quality sampling and analysis was conducted on May 11, 2000 using the seven wells that were initially installed on the site (The San Joaquin Company 2001d)• Six additional rounds of sampling and analysis were conducted between that date and late July 2002, with the rounds conducted in April and July 2002 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, 2002c, 2002b, and a2002a). This report presents the results of an eighth sampling round that was conducted on October 25, 2002, together with. a compilation of the data obtained from the earlier rounds of groundwater-quality monitoring. 1.1 Site Location The subject property is situated at 7500 West Eleventh Street, Tracy, California, at the intersection of Chrisman Road and West Eleventh Street. That location is shown on Figure 1. Its elevation is between 48 and 51 feet above mean sea level (MSL). A map of the site and neighboring areas is presented on Figure 2. (Note. Figure 2 has been updated since it was last issued in October 2002 to show new construction at 7601 West Eleventh Street and the occupancy of the commercial building at 7501 West Eleventh Street by Capitol Furniture. The latter site was previously unoccupied after being vacated by a Fisco Farm and Home Store.) 1.2 Site Codes The California State Water Resources Control Board (SWRCB) has established the following Global ID code for the site under its Geographic Environmental Information Management System: T0607700606 The Regional Water Quality Control Board (RWQCB) — Central Valley Region has established the following Case Number: 390773 The San Joaquin County Public, Environmental Health Department (SJCEHD) has established the following identifier for the subject site: Site Code: 1392 { '4 ,i sic i �