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Report:Groundwater-quality Monitoring—July 27,2004: 7500 West Eleventh Street, Tracy, CA. Page I <br /> 1.0 INTRODUCTION <br /> This groundwater-quality monitoring report has been prepared for the site of a former <br /> fueling station at 7500 West Eleventh Street, Tracy, California (Navarra Site). The <br /> fueling station ceased operation in 1998 and, in December of that year, eight underground <br /> ' fuel tanks were removed from the property. At that time, it was found that soil and <br /> groundwater beneath the site were affected by fuel hydrocarbons. A site characterization <br /> investigation completed in May 2000 included installation of seven groundwater-quality <br /> monitoring wells (The San Joaquin Company 2001d). A second phase of site <br /> characterization was conducted in March and April 2002 during eight t additional <br /> � <br /> groundwater-quality monitoring wells were installed (The San Joaquin Company 2002c). <br /> {, 1 A third phase of site characterization was conducted in April 2004, during which seven <br /> additional groundwater-quality monitoring wells and five floating product monitoring <br /> ..; wells were installed(The San Joaquin Company 2004a).. <br /> The first round of groundwater-quality sampling and analysis was conducted on May 11, <br /> 2000, using the seven wells that were initially installed on the site (The San Joaquin <br /> Company 2001d). Ten additional rounds of sampling and analysis were conducted <br /> between that date and July 30, 2003, with the rounds conducted in April, July and' <br /> October 2002, and in January and April 2003, involving recovery of groundwater <br /> samples from all 15 wells that had been installed at the site by that time(The San Joaquin <br /> Company 2001c, 2001b, 2001a, 2002d, 2002c, 2002b, 2002x, 2003e and 2003d). The <br /> r July 2003, October 2003 and January 2004 sampling rounds (The San Joaquin Company <br /> 2004c, 2003c, 2003b) were reduced at the direction of the San Joaquin County <br /> Environmental Health Division(SJCERD)to the sampling of seven, ten and seven of the <br /> 15 groundwater-quality monitoring wells, respectively. The fourteenth monitoring round <br /> f_ was conducted on April 21, 22 and 30, 2004, when groundwater samples were recovered <br /> from the 15 pre-existing wells together with data from the seven new groundwater- <br /> quality monitoring wells installed in that month. <br /> This report documents the fifteenth monitoring round, which was conducted at the 7500 <br /> West Eleventh Street site on July 26 and 27, 2004. It includes a compilation of the data <br /> ;JJ obtained from all earlier rounds of groundwater-quality monitoring. <br /> In April, 2004, a program of testing the quality of water recovered from potable water <br /> supply wells in the neighborhood of the Navarra Site was initiated. This report includes <br /> the results of the second monitoring round of that program, which was conducted on July <br /> _. 27, 2004. This report also includes records from a program of monitoring the thickness of <br /> light non-aqueous phase liquid (LNAPL), present as floating product, in an array of five <br /> floating product monitoring wells and three selected groundwater-quality monitoring <br /> wells. <br /> 1.1 Site Location <br /> The subject property is situated at 7500 West Eleventh Street, Tracy, California, at the <br /> intersection of Chrisman Road and West Eleventh Street. That location is shown on <br /> i <br /> sic <br /> i_=J - <br />