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Report: Groundwater-quality Monitoring—July 30,2001%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 2002c). 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). Nine additional rounds of sampling and analysis were conducted between that date and mid-April 2003, with the rounds conducted in April, July and October 2002 and 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, 2002d, 2002c, 2002b, 2002a, 2003b and 2003a). This report presents the results of the eleventh sampling round, which was conducted on July 30, 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 issue in April 2003 to: 1) show a change in occupancy of the property at 24195 Chrisman Road from Central Valley Collision to Anthony's Auto Body; 2) remove the truck service bay previously located at the rear of the restaurant at 7500 West Eleventh Street that was destroyed by fire since SJC's last groundwater-quality monitoring report (The San Joaquin Company 2003a), and; 3) note 3 the fact that the Casa Mendoza Restaurant located on the subject property is now, at least temporarily, closed due to fire damage. 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 sic