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• Quarterly Report - Fourth Quarter 2002 ' SIERRA LUMBER 375 West Hazelton Avenue, Stockton, California I1.0. INTRODUCTION ' At the request of Mr Bob Long,Advanced GeoEnvironmental, Inc (AGE)has prepared this report of environmental activities conducted at 375 West Hazelton Avenue(the site),Stockton,California The objectives of the activities were to monitor dissolved petroleum hydrocarbon concentrations in ' ground water,to characterize ground water flow direction and gradient, and to monitor the progress and effectiveness of soil vapor extraction (SVE) and In-situ air sparging (IAS) remediation at the site The site setting is illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 ' This report has been prepared in accordance wl th guidelines issued by the California Regional Water Quality Control Board-Central Valley Region(RWQCB) for investigation of underground storage tank(UST)sites A summary of previous investigations at the site was included in Corrects ve Action Plan, dated 15 February 2000 Analytical data for ground water acquired to date 7s included in this report lie 2.0. GROUND WATER MONITORING AND SAMPLING PROCEDURES On 03 December 2002,groundwater monitoring and sampling were performed at the site on selected wells Ground water monitoring and sampling procedures fo- the site were outlined in Remedial InvestigationlEeasibility Study Work Plan, dated 02 March 1999, prepared by AGE and approved by the San Joaquin County Environmental Health Department (SJCEHD) by letter dated 07 April 1999 As-built monitoring well construction details also are summarized in Table 1 I2 1 WELL MONITORING AND EVACUATION ' Depth to ground water was measured to monitoring wells MW-1 through MW-8 from the top of the well casing to the nearest 0 01-foot utilizing a Solinst water level meter The ground water elevation in each well was calculated by subtracting the measured depth to ground water from the surveyed casing elevation(Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) After water levels were measured, approximately 8 to 15 gallons of ground water (a minimum of three casing-water volumes per well)were evacuated(purged) from wells MW-1, MW-2,MW-4A, MW-4B,MW-5 and MW-8 utilizing a Watera-Hydro-Lift II pump equipped with a mechanical arm and polyethylene tubing Temperature, pH and conductivity were measured for stabilization at • ' Advanced GcoEnvironmental,Inc