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' Quarterly Report - Second Quarter 2002 <br /> SIERRA LUMBER <br />' 375 West Hazelton Avenue, Stockton, California <br /> I1.0. 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 30 May 2002,ground water monitoring and sampling were performed at the site on wells MW-1, <br /> MW-2,MW-4A,MW-413,MW-6 and MW-8,and depth to water was recorded for wells MW-3 and <br /> MW-7, as-built monitoring well construction details are summarized in Table 1 Ground water <br /> monitoring and sampling procedures for the site were outlined in Remediallnvestigation/Feasibility <br /> Study Work Plan, dated 02 March 1999,prepared by AGE and approved by the San Joaquin County <br /> Environmental Health Department (EHD) by letter dated 07 April 1999 <br /> 2 1 WELL MONITORING AND EVACUATION <br /> Depth 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 2 to 101/3 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 /> MW-413, MW-6 and MW-8 utilizing polyethylene disposable bailers or a two-stage pump, <br />' approximately 9 gallons ofwater were purged from MW-4B before being bailed"dry" Temperature, <br />' Advanced GeoE nviron mental,Inc <br />