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Quarterly Report - Third Quarter 2003 PACIFIC PRIDE - SOUTH EL DORADO STREET ' 3147 South El Dorado Street, Stockton, California ' 1.0. INTRODUCTION Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for 3147 South El ' Dorado Street(the site),Stockton,California The scope of work included performance of a quarterly ground water monitoring event and preparation of this report The objectives were to monitor ' concentrations of petroleum hydrocarbons in ground water and to characterize ground water flow direction and gradient at the site The site setting is illustrated in Figure 1 Site structures and monitoring well locations are depicted in Figure 2 ' This report is prepared in accordance with guidelines issued by the California Regional Water Quality Control Board-Central Valley Region(RWQCB)for investigation of underground storage ' tank (UST) sites Background information is summarized in the AGE-prepared Prehminary Investigation and Evaluation Report-June 1999, dated 26 July 1999 ' Previous soil characteristics data obtained by a CPT investigation enabled AGE to define four informal hydrogeologic units(CPTSiteInvestigation-Third Quarter 2001,dated 25 October 200 1) The informal hydrogeologic units were defined as First Water Zone(35-55 feet bsg),Second Water ' Zone(60-80 feet bsg), Third Water Zone(90-100 feet bsg) and Fourth Water Zone (I 10 to at least 125 feet bsg) 2.0. PROCEDURES tOn 19 September 2003,ground water monitoring and sampling were performed at the site on wells MW-1 through MW-12, as-built monitoring well construction details are summarized in Table 1 ' Ground Water monitonng procedures for the site were outlined in the AGE-prepared Monitoring Well Installation Work Plan - September 1999, dated 01 September 1999, and approved by San Joaquin County Environmental Health Department (SJCEHD) letter dated 23 September 1999 2 1 WELL MONITORING AND PURGING Depth to ground water was measured in each well from the top of the well casing to the nearest 0 01-foot utilizing a Sohnst water level meter The ground water elevation in each well was 1 calculated by subtracting the measured depth to ground water from the surveyed casing elevation (Table 2),First Water Zone ground water elevations were plotted and contoured on a scaled site map (Figure 3) ' tAfter water levels were measured, approximately 3 to 28 gallons of ground water (a minimum of three casing-water volumes per well) were purged from single-completed wells MW-1 through Advanced GeoEnvironmental,Inc