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Quarterly Report - Fourth Quarter 2003 <br /> PACIFIC PRIDE - SOUTH EL DORADO STREET <br /> ' 3147 South El Dorado Street, Stockton, California <br /> ' 1.0. INTRODUCTION <br /> Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for 3147 South El <br /> Dorado Street(the site),Stockton,California The scope of work Included performance of a quarterly <br /> ground water monitoring event and preparation of flus report The objectives were to monitor <br /> ' concentrations of petroleum hydrocarbons In ground water and to characterize ground water flow <br /> direction and gradient at the site The site setting Is Illustrated in Figure 1 Site structures and <br /> monitoring well locations are depicted in Figure 2 <br /> ' This report is prepared in accordance with guidelines Issued by the California Regional Water <br /> Quality Control Board-Central Valley Region(RWQCB)for investigation of underground storage <br /> ' tank (UST) sites Background information is summarized in the AGE-prepared Preliminary <br /> Investigation and Evaluation Report-June 1999, dated 26 July 1999 <br /> ' Previous soil characteristics data obtained by a CPT investigation enabled AGE to define four <br /> informal hydrogeologic units(CPT Site Investigation-Third Quarter 2001,dated 25 October 2001) <br /> The informal hydrogeologic units were defined as First Water Zone(35-55 feet bsg),Second Water <br /> ' Zone(60-80 feet bsg), Third Water Zone(90-100 feet bsg) and Fourth Water Zone(I 10 to at least <br /> 125 feet bsg) <br /> ' 2.0. PROCEDURES <br /> ' On 12 November 2003, ground water monitoring and sampling were performed at the site on wells <br /> MW-1, MW-2 and MW-5 through MW-12, as-built monitoring well construction details are <br /> ' summarized In Table 1 Due to a field technician over-sight, wells MW-3 and MW-4 were not <br /> monitored or sampled during this monitoring event Groundwater monitoring procedures for the site <br /> were outlined in the AGE-prepared Monitoring Well Installation Work Plan-September 1999, dated <br /> ' 01 September 1999, and approved by San Joaquin County Environmental Health Department <br /> (SJCEHD) letter dated 23 September 1999 <br /> G <br /> 2 1 WELL MONITORING AND PURGING ���, 't� <br /> ' Depth to groundwater was measured in wells MW-1,MW-2 and MW-5 through MW-12 from the 1'.i i <br /> top of the well casing to the nearest 0 01-foot utilizing a Solinst water level meter Due to a field -\k, <br /> technician over-sight, wells MW-3 and MW-4 from the CallformaTank Line Inc (3105 South El <br /> Dorado Street) site were mistakenly monitored Instead of the Pacific Pride- South El Dorado wells 'V <br /> MW-3 and MW-4(Figure 2) As a result, AGE contacted Cal Tech Environmental Laboratories to l <br /> omit the MW-3 and MW-4 results from the laboratory report � <br /> Advanced GeoEnvironmentsl,Inc <br />