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Quarterly Report - Third Quarter 2000 SIERRA LUMBER I375 West Hazelton Avenue, Stockton, California 1.0. INTRODUCTION Advanced GeoEnvironmental, Inc (AGE)has prepared this Quarterly Report for 375 West Hazelton Avenue, Stockton, California The site setting is Illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground water and to characterize ground water flow direction and gradient on the site This report is prepared I in accordance with guidelines established by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and by the Central Valley Regional Water Quality Control Board(CVRWQCB) 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 I 2000 Analytical data acquired to date is included in this report ' 2.0. QUARTERLY MONITORING AND SAMPLING PROCEDURES On 03 August 2000,ground water monitoring and sampling were performed on wells MW-2,MW-3, MW-4A, MW-4B, and MW-6 Ground water monitoring and sampling procedures for the site were outlined in Remedial Investigation/Feasibility Study Work Plan, dated 02 March 1999, prepared by IAGE and approved by the PHS-EHD by letter dated 07 April 1999 f21 MONITORING WELL PURGE PROCEDURES I Depths to ground water were measured in each well from the tops of the well casings at the site to the nearest 0 01 foot utilizing a Solinst water level meter The ground water elevation in each well at the site was calculated by subtracting the measured depth to ground water from the surveyed I casing elevation(Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) I After water levels were measured, approximately 8 to 15 gallons of ground water (a minimum of three casing-water volumes per well) were removed from wells MW-2, MW-3, MW-4A, MW-413, and MW-6 utilizing a submersible pump Temperature, pH and conductivity were measured for stabilization at regular purge-volume intervals from each well using a Hydac water analyzer Field data and logs are included with Appendix A Purged ground water was containerized in 55-gallon drums and was stored on-site In an area lacking general public access Advanced GeoEnvironmental,Inc I ,