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1 t _ n t.. z -•- - v IjL <br /> 1' Quarterly Report - Fourth Quarter 2005 <br /> SIERRA LUMBER MANUFACTURERS (Case #2) <br />' R 375 West Hazelton Avenue, Stockton, California <br />' 1.0. INTRODUCTION <br /> At the request of Mr Bob Long of Sierra Lumber, Advanced GeoEnvironmental, Inc (AGE) has <br /> prepared this quarterly report for the property located at 375 West Hazelton Avenue, Stockton, <br /> California The scope of work Included monitoring and sampling three on-site ground water <br /> monitoring wells,submission of monitoring and analytical data to the State Water Resources Control <br />' Board's GeoTracker Information management system, and preparation of this report The site and <br /> surrounding area are Illustrated on Figure 1 Structures, soil borings, and monitoring well locations <br /> are Illustrated on Figure 2 <br /> This report has been prepared In accordance with guidelines established by the Central Valley <br />' Regional Water Quality Control Board (CVRWQCB) for the subsurface investigation of <br /> underground storage tank (UST) sites Background information, Including details of previous site <br /> assessment work, is presented in Appendix A <br /> 2.0. PROCEDURES <br /> Field work was performed in accordance with guidelines Issued by the CVRWQCB for the <br /> Investigation of underground storage tank(UST)sites and by the San Joaquin County Environmental <br />' Health Department (EHD) for the sampling of ground water monitoring wells Ground water <br /> monitoring and sampling procedures were outlined in the AGE-prepared Preliminary Site <br /> Investigation Work Plan, dated 27 December 2004 and approved by the EHD in a letter dated <br /> 23 February 2005 <br /> I2 1 WELL MONITORING AND EVACUATION <br /> On 23 November 2005,the depths to ground water in monitoring wells MW-9 through MW-11 were <br /> measured from the tops of the well casings to the nearest 0 01-foot utilizing a Solinst water level <br /> meter Ground water elevation in each well was calculated by subtracting the measured depth to <br /> Iground water from the surveyed casing elevation (Table 1) <br /> After water levels were measured,approximately 8 to 9 gallons of water(a minimum of three casing <br /> water volumes per well) were purged from wells MW-9 through MW-11 using a Waterra inertia <br /> pump and dedicated tubing Ground water temperature, pH, and conductivity were measured at <br /> regular intervals for stabilization during purging using an Oakton water analyzer Field sheets and <br /> I data are Included in Appendix B Purged water was stored on-site In properly labeled, Department <br /> of Transportation (DOT)-approved 55-gallon drums pending proper disposal <br /> IAdvanced GeoEnvironmental,Inc <br /> I <br />