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Quarterly Report - Second Quarter 2000 <br /> ' SIERRA LUMBER <br /> 375 West Hazelton Avenue, Stockton, California <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 /> 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 prepared <br /> ' in accordance with guidelines established by the San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS-EHD) and by the Central Valley Regional Water Quality <br /> Control Board (CVRWQCB) for investigation of underground storage tank(UST) sites A summary <br /> of previous investigations at the site was included in Report 4" Quarterly Monitoring, dated 21 <br /> November 1997, prepared by John P Cummings & Associates Analytical data acquired to date is <br /> included in this report <br /> 2.0. QUARTERLY MONITORING AND SAMPLING PROCEDURES <br /> On 28 April 2000, ground water monitoring and sampling were performed on wells MW-1 through <br /> ' MW-8 Ground water monitoring and sampling procedures for the site were outlined in Remedial <br /> Investigation/Feasiblility Study Work Plan, dated 02 March 1999 prepared by AGE and approved <br /> by the PHS-EHD by letter dated 07 April 1999 <br /> 2 1 MONITORING WELL PURGE PROCEDURES <br /> 1 Depths to ground water were measured in each well from the tops of the well casings at the site to <br /> the nearest 0 01 foot utilizing a Solinst water level meter The ground water elevation in each well <br /> ' at the site were calculated by subtracting the measured depth to ground water from the surveyed <br /> casing elevation(Table 1) Ground water elevations were plotted and contoured on a scaled site map <br /> (Figure 3) -. <br /> ' After water levels were measured, approximately 8 to 12 gallons of ground water (a minimum of <br /> three well-volumes per well)were removed from wells MW-1 through MW-8 utilizing a submersible <br />' pump Temperature, pH and conductivity were measured for stabilization at regular purge-volume <br /> intervals from each well using a Hydac water analyzer Field data and logs are included with <br /> ISAppendix A Purged ground water was containerized in 55-gallon drums and was stored on-site in <br /> an area lacking general public access <br /> tAdvanced GeoEnviron mental,Inc <br />