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' Quarterly Report - Furst 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 GeoEnvironmental, 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 effectiveness of <br /> soil vapor extraction (SVE) and in-situ air sparging (IAS) remediation at the site This report has <br /> been prepared in accordance with guidelines issued by the California Regional Water Quality <br /> Control Board - Central Valley Region (RWQCB) for investigation of underground storage tank <br /> (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 12 February 2002, ground water monitoring and sampling were performed at the site on wells <br /> MW-1, MW-2, MW-4A, MW-4B and MW-6, as-built monitoring well construction details are <br /> summarized in Table 1 Ground water monitoring and sampling procedures for the site were outlined <br /> in Remedial In Study Work Plan, dated 02 March 1999, prepared by AGE and <br /> approved by the San Joaquin County Environmental Health Department (EHD) by letter dated <br /> 07 April 1999 <br /> 2 1 WELL MONITORING AND EVACUATION <br /> IDepth to ground water was measured in each well from the top of the well casing to the nearest <br /> 0 01-foot utilizing a Solinst water level-meter The ground water elevation"in each well was <br /> calculated by subtracting the measured depth to ground water from the surveyed casing elevation <br /> (Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) <br /> After water levels were measured, approximately 5 to 10% gallons of ground water(a minimum of <br /> three casing-water volumes per well)were evacuated(purged) from the wells utilizing polyethylene <br /> disposable bailers, approximately 11 gallons of water were purged from MW-4B before being bailed <br /> "drys" Temperature, pH and conductivity'were measured for stabilization at regular purge-volume <br /> • <br /> IAdvanced GeoEnvironmental,Inc <br />