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' Quarterly Report - March 1999 <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 <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 <br /> 2.0. NIT UARTERLY MONITORING O ORING AND SAMPLING PROCEDURES <br />� . On 15 March 1999, ground water monitoring and sampling was performed at wells MW-I through <br /> MW-7 Ground water monitoring procedures for the site were outlined in Work Plan Addendum - <br />' May 1998, dated 05 May 1998 and approved by the PHS-EHD by a letter on 22 May 1998 <br />' 21 MONITORING WELL PURGE PROCEDURES <br /> Depth to ground water was measured at each monitoring well from the tops of the well casings at <br />' the site to the nearest 0 01 foot utilizing a Solinst water level meter Ground water elevations in each <br /> well at the site were calculated by subtracting the measured depth to ground water from surveyed <br />' casing elevations(Table 1) Ground water elevations were plotted and contoured on a scaled site map <br /> (Figure 3) <br />' After water levels were measured, approximately 9 to 15 gallons of ground water (a minimum of <br /> three well-volumes per well) were removed from wells MW-i through MW-7 utilizing a two-stage <br /> submersible pump Temperature, pH and conductivity were measured for stabilization at regular <br />' purge-volume intervals from each well using an ICM Model 52200 water analyzer Field data and <br /> logs are included with Appendix A Purged ground water was containerized in 55-gallon drums and <br /> was stored on-site in an area lacking general public access <br /> I <br /> i <br />' Advanced GeoEn%kronmental,Inc <br />