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I Quarterly Report - Second°4)uEar€er M12 �1 SIERRA LUMBER- 375 West Hazelton Avenue, Stockton, California 1.0. INTRODUCTION IAdvanced GeoEnvironmental Inc (AGE)has prepared this quarterly report for 375 West Hazelton I Avenue(the site), Stockton, California The site setting is illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 I The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground water,to characterize ground water flow direction and gradient and to monitor the effectiveness of soil vapor extraction (SVE) and in-situ air sparging (IAS) remediation at the site This report has I been prepared in accordance with guidelines established by the California Regional Water Quality Control Board - Central Valley Division (CRWQCB) for investigation of underground storage tank (UST) sites A summary of previous investigations at the site was included in Corrective Action Plan, dated 15 February 2000 Analytical data for ground water acquired to date is included in this report I • 2.0. GROUND WATER MONITORING AND SAMPLING PROCEDURES IOn 23 April 2001, ground water monitoring and sampling were performed at the site on wells MW-1, MW-2, MW-4A, MW-4B and MW-6 Ground water monitoring and sampling procedures Ifor the site were outlined in Remedial Investigation/Feasibility Study Work Plan, dated 02 March 1999, prepared by AGE and approved by the PHS-EHD by letter dated 07 April 1999 21 MONITORING WELL PURGE PROCEDURES IDepths to ground water were measured in each well from the tops of the well casings to the nearest 0 01-foot utilizing a Solinst water level meter Ground water elevation in each well at the site was I calculated by subtracting the measured depth to ground water from the surveyed casing elevations (Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) I After water levels were measured, approximately 7 to 15 gallons of ground water (a minimum of three casing-water volumes per well) were removed from wells MW-1, MW-2, MW-4A, MW-4B and MW-6 utilizing a two-stage submersible pump or a disposable polyethylene batter Temperature, pH and conductivity were measured for stabilization at regular purge-volume intervals from each well using either an ICM water analyzer or an Oakton water analyzer Field data and logs are in Appendix A Purged ground water was containerized in 55-gallon drums and was stored on-site in an area lacking general public access IAdvanced GeoEnvironmental,Inc I