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t <br /> Quarterly Report - Septemiber 1999 <br />' SIERRA LUMBER <br /> 375 West Hazelton Avenue, Stockton, California <br /> I <br /> I <br /> 1.0. INTRODUCTION <br /> Advanced GeoEnvironmental, Inc (AGE)has prepared this Quarterly Report for 375 West Hazelton <br /> Avenue, Stockton, California The site setting is illustrated on Figure 1 Site structures and <br />' monitoring well locations are depicted on Figure 2 <br /> H <br /> The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground <br />' water and to characterize ground water flow 'direction and gradient on the site This report is <br /> prepared in accordance with guidelines established by the San Joaquin County Public Health <br /> Services - Environmental Health Division (PHS-EHD) and by the Central Valley Regional Water <br /> Quality Control Board (CVRWQCB) for investigation of underground storage tank (UST) sites A <br /> summary of previous investigations at the site was included in Report 4" Quarterly Monitoring, <br /> dated 21 November 1997, prepared by John P Cummings & Associates Analytical data acquired <br /> to date is included in this report <br /> lie 2.0. QUARTERLY MONITORING AND SAMPLING PROCEDURES <br /> On 10 September 1999, ground water monitonng and sampling was performed on wells MW-1 <br /> I through MW-8 Ground water monitoring and sampling procedures for the site were outlined in <br /> Remedial InvestigationlFeasiblllity Study Work Plan, dated 02 March 1999 prepared by AGE and <br /> approved by the PHS-EHD by letter dated 07 April 1999 <br />' 21 MONITORING WELL PURGE PROCEDURES <br /> Depths to ground water were'measured from the top of each well casing at the site to the nearest 0 01 <br /> foot utilizing a Solinst water level meter Ground water elevations in each well at the site were <br /> calculated'by subtracting-the measured-depth to ground water from surveyed-casing elevations - <br /> (Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) <br /> After water levels were measured, approximately six to twelve gallons of ground water(a minimum <br /> I of three well-volumes per well) were removed from wells MW-1 through MW-8 utilizing a <br /> submersible two-stage pump, ground water evacuation (purging)was initiated at the top of the water <br /> column and the pump was slowly lowered to total depth to purge ground water within the entire well <br /> casing Temperature, pH and conductivity were measured for stabilization at regular purge-volume <br /> intervals from each well using an ICM Model 52200 water analyzer Field data and logs are in <br /> IAdvanced GeoEnvironmental,Inc <br /> s - <br />