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Report: Groundwater-quality Monitoring—April 15,2003: 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 t;? conducted in March and Aril 2002 during which eight additional April g gh 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). Eight additional rounds of sampling and analysis were conducted between that date and late January 2003, with the rounds conducted in April, July and _ October 2002 and January 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, 2001 a, 2002d, 2002c, 2002b, 2002a, and 2003). This r resents the results of report P the tenth sampling round, which was conducted on April 15, 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. 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 Inforrnation Management System: T0607700606 f 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 �j established the following identifier for the subject site: Site Code: 1392 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 sic 1