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Report: Groundwaler-quality Monitoring—January 20,2003: 7500 West Eleventh Street, Tracy, C4. 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 t 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 2002c). F' 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 ka Company 2001d). Seven additional rounds of sampling and analysis were conducted == between that date and late October 2002, with the rounds conducted in April, July and October 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, 200 lb, 2001 a, 2002d, 2002c, 2002b, and 2002a), This report presents the results of the ninth sampling round, which was conducted on January 20, 2003, 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 a newly installed fire suppression tank at 7601 West Eleventh Street. 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 1.3 Background F The property at 7500 West Eleventh Street was used as a fueling station for trucks and sic