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I h <br />' Quarterly Report ort - First Quarter 2003 <br />' SIERRA LUMBER <br /> 375 West Hazelton Avenue, Stockton, California <br />' 1.0. INTRODUCTION <br />' At the request of Mr Bob Long of Sierra Lumber, Advanced GeoEnvironmental, Inc (AGE) has <br /> prepared this report of environmental activities conducted at 375 West Hazelton Avenue(the site), <br /> Stockton, California The objectives of the activities were to monitor dissolved petroleum <br />' hydrocarbon concentrations in ground water, to characterize ground water flow direction and <br /> gradient,and to monitor the progress and effectiveness of soil vapor extraction(SVE)and in-situ air <br /> sparging(LAS)remediation at the site The site setting is illustrated on Figure 1 Site structures and <br />' monitoring well locations are depicted on Figure 2 <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 A summary of previous investigations at the site was included in the AGE prepared <br /> Corrective Action Plan, dated 15 February 2000 Analytical data for ground water acquired to date <br /> is included in this report <br /> 2.0. GROUND WATER MONITORING AND SAMPLING PROCEDURES <br /> On 20 March 2003, ground water monitoring and sampling were performed at the site on selected <br /> groundwater monitoring wells Groundwater monitoring and sampling procedures for the site were <br /> outlined in Remediallnvestigatcon/Feasibility Study Work Plan, dated 02 March 1999,prepared by <br /> AGE and approved by the San Joaquin County Environmental Health Department (SJCEHD) by <br /> letter dated 07 April 1999 As-built monitoring well construction details are also summarized in <br /> Table 1 <br /> I <br /> 2 1 WELL MONITORING AND EVACUATION <br /> Depth to ground water was measured in monitoring wells MW-1 through MW-8 from the tops of <br /> the well casings to the nearest 0 01-foot utilizing a Solinst water level meter The ground water <br /> elevation in each well was calculated by subtracting the measured depth to ground water from the <br /> surveyed casing elevation(Table 1) Ground water elevations were plotted and contoured on a scaled <br /> site map (Figure 3) <br /> After water levels were measured, approximately 8 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-413, <br /> Iand MW-6 utilizing a polyethylene disposable bailer Due to an abundance of sediment accumulation <br /> Advanced Geo Environmental,Inc <br /> I j <br />