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BACKGROUND INFORMATION Fernando's Place ' 1201 South Center Street, Stockton, California ' The site is located at the intersection of Jackson Street, French Camp Road and South Center Street (Figure 2), and was the former location of a gasoline service station The site is occupied currently by several buildings,including a small-engine repair facility and a single-story,multi-family residence ' PREVIOUS E IOUS SITE ASSESSMENT ' According to Work Plan -Phase 2 Site Investigation, 1201 S Center Street, Stockton, CA, dated 28 May 1999, prepared by Foothill Engineering (FE), two five-hundred gallon and one 8,500-gallon ' gasoline underground storage tanks (UST 1, UST 2 and UST 3, respectively) were removed from the site by Jim Thorpe Oil on 26 October 1994 Ten soil samples were analyzed from the excavation soil stockpile, the UST excavations and the product piping by GeoAnalytical Labs Each sample ' contained detectable concentrations of petroleum hydrocarbon contamination FE reported that the highest concentrations were located near the west end of UST 3 (Figure 2) The excavation was backfilled to surface grade following sample collection ' On 28 April 1998, soil boring PB 1 was advanced near UST 1 and UST 2 to a depth of 30 feet below surface grade(bsg)for the collection of soil samples Analyzed samples contained concentrations of ' total petroleum quantified as gasoline(TPH-g)as high as 14,100 milligrams per kilogram(mg/kg) Additionally, samples were collected from the soil boring for MW-1, installed on 28 April 1998 Analyzed samples from MW-1 contained high concentrations of TPH-g and benzene, toluene, ' ethylbeneze and total xylenes (BTEX) compounds to a depth of approximately fifty feet bsg Four additional ground water monitoring wells were installed by FE between 08 and 12 March 1999 ' Analyzed soil samples collected from monitoring well soil borings contained detectable concentrations of TPH-g to depths as great as 105 feet bsg and BTEX compounds to depths as great as 120 feet bsg Figure 2 illustrates monitoring well and former UST locations ' 1 August 2001 Advanced Geo Environmental Inc AGE advanced six Cone Between 14 and 2 g (AGE) ' Penetrometer Testing(CPT)borings on-and off-site to depths between 122 and 175 feet bsg Based on data collected from the CPT borings, AGE identified four potential hydrogeologic units (First Water Zone, Second Water Zone, Third Water Zone and Fourth Water Zone) Significant ' concentrations of TPH-g, BTEX and 1,2-DCA compounds were detected in grab ground water samples collected from each of the hydrogeologic units ' ADDITIONAL MONITORING WELL INSTALLATION Between, 27 August and 10 October 2002, AGE prepared for and advanced seven soil borings for ' collection of soil samples and/or installation of monitoring wells (MW-4 through MW-9) Screen intervals were installed at the following intervals 20 to 40 feet bsg, 115 to 120 feet bsg, 141 to 146 feet bsg, and 165 to 170 feet bsg Monitoring wells MW-4 and MW-5 were constructed with a fifth 1 r