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Quarterly Report - Second Quarter 2002 CHARLIE'S DAY AND NITE 706 North'EI Dorado Street, Stockton, California I1.0. INTRODUCTION ' At the request of Mr Charles Skobrak of Charlie's Day and Nite,Advanced GeoEnvironmental,Inc (AGE) has prepared this quarterly report for the property located at 706 North El Dorado Street, 'S Stockton, California Quarterly ground water monitoring was conducted on 10 May,2002 The site location and the surrounding area are illustrated in Figure 1 Structures as well as boring and monitoring well locations are illustrated on Figure 2 Background information was summarized in the AGE-prepared Prehminary Investigation and Evaluation Report-March 1999,dated 26 March ' 1999 2.0. BACKGROUND Following is a brief outline of site assessment activities performed at the site to date • Two 4,000-gallon underground storage tanks (USTs) were removed from the southeastern • portion of the site on 10 June 1997, reportedly, the USTs had not been in operation since at least 1978 Petroleum hydrocarbons were detected In the sample collected beneath the western end of the southern UST • Between October and November 1998,six soil probe bonngs were advanced at the site Total petroleum hydrocarbons quantified as gasoline(TPH-g), toluene, ethylbenzene and xylenes were detected in soil samples collected from boring B3 TPH-g was detected in grab water samples collected from bonngs B1, B3 and B5 Benzene, toluene, ethylbenzene_and total xylenes (BTEX) were detected in the grab water sample collected from boring B 1 Ethylbenzene and xylenes were detected In the water sample collected from boring B3 • On 19 October 1999, three monitoring wells (MW1, MW2 and MW3) were installed to a depth of 35 feet below surface grade(bsg)at the site TPH-g,ethylbenzene and xylenes were detected in the soil sample collected from boring MW2 at a depth of 20 feet bsg TPH-g and BTEX compounds were detected in soil samples collected from boring MW3 at depths of 20 and 25 feet bsg • On 18 September 2001, monitoring wells MW4 and MW5 were installed at the site Petroleum hydrocarbons were not detected in any ofthe analyzed soil samples collected from ' the two pilot borings • Between 01 and 03 October 2001, three soil probe borings were advanced at the site to collect soil and grab ground water samples to define the vertical extent of hydrocarbon- Impact in the two media Petroleum hydrocarbons were not detected in the analyzed soil samples collected from the probe borings However, low concentrations of BTEX Advanced GeoEnvironmental,Inc