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1 <br /> 1 <br /> Quarterly Report - Third Quarter 2002 <br /> SIERRA LUMBER <br /> 375 West Hazelton Avenue, Stockton, California <br /> 1.0 INTRODUCTION <br /> At the request of Mr Bob Long, Advanced GeoEnviromnental, Inc (AGE) has prepared this <br /> quarterly report for 375 West Hazelton Avenue (the site), Stockton, California The site setting is <br /> illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 <br /> The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground <br /> water, to characterize ground water flow direction and gradient, and to monitor the progress and <br />' effectiveness of soil vapor extraction (SVE) and in-situ air sparging (IAS) remediation at the site <br /> This report has been 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 <br />' A summary of previous investigations at the site was included in Corrective Action Plan, dated <br /> 15 February 2000 Analytical data for ground water acquired to date is included in this report <br />' 2.0. GROUND WATER MONITORING AND SAMPLING PROCEDURES <br />' On 20 August 2002, ground water monitoring and sampling were performed at the site on selected <br /> wells Ground water monitoring and sampling procedures for the site were outlined in Remedial <br /> Investigation/Feasibility Study Work Plan, dated 02 March 1999, prepared by AGE and approved <br />' by the San Joaquin County Environmental Health Department(EHD)by letter dated 07 April 1999 <br /> As-built monitoring well construction details are summarized in Table 1 <br />' 2 1 WELL MONITORING AND EVACUATION <br />' Depth to ground water was measured in monitoring wells MW-1, MW-2, MW-4A, MW-4B, and <br /> MW-5 through MW-8 from the top of the well casing to the nearest 0 01-foot utilizing a Solinst <br /> water level meter The ground water elevation in each well was calculated by subtracting the <br />' measured depth to ground water from the surveyed casing elevation (Table 1) Ground water <br /> elevations were plotted and contoured on a scaled site map (Figure 3) <br /> After water levels were measured,approximately 7%2 to 14 gallons of ground water(a minimum of <br /> three casing-water volumes per well)were evacuated(purged)from wells MW-1,MW-2,MW-4A, <br /> I MW-413, and MW-6 utilizing polyethylene disposable bailers Temperature, pH and conductivity <br /> were measured for stabilization at regular purge-volume intervals from each well utilizing an Oakton <br /> i <br /> IAdvanced GeoE nvi ron mental,Inc <br />