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I � <br /> 1, _ <br /> 1 <br /> Quarterly Report - Fourth Quarter 2000 <br />' Bogetti's Orchard Service Station <br /> 2393 East Highway 132, Vernalis, California <br />' 1.0. INTRODUCTION <br /> At your request Advanced GeoEnvironmental, Inc (AGE) has prepared Quarterly Report-Fourth <br /> Quarter 20000 for the Bogetti's Orchard Service Station site located at 2393 East Highway 132, <br />' Vernalis, California (site) The location of the site is illustrated on Figure 1 A plan of the site is <br /> illustrated on Figure 2 The scope ofwork included conducting aground water monitoring event and <br /> Iobtaining laboratory analysis of ground water samples <br /> This report is prepared in accordance with guidelines established by the Central Valley Regional <br /> Water Quality Control Board (CVRWQCB) - Appendix A of the Tri-Regional Recommendations <br /> related to the subsurface investigation of the former underground storage tank(UST) ,system on the <br /> site <br /> I Background information and previous site invests ation activities, aloe with distribution of <br /> g g <br /> petroleum-impacted soil and ground water were presented in Preliminary Site Assessment Report- <br />' February 2000, prepared by AGE, dated 26 April 2000 <br />�. 2.0. PROCEDURES <br /> I Ground water monitoring activities were performed in accordance with guidelines established by the <br /> San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and <br /> Central Valley Regional Water Quality Control Board (CVRWQCB) and were performed in <br /> accordance with the approved work plan dated 15 April 1999 <br /> I21 GROUND WATER DEPTH MEASUREMENT AND PURGING <br /> On 13 November 2000, a Sohnst water level meter was used to measure the depth to ground water <br /> I in each well relative to the top of the well casing After ground water depth measurements were <br /> collected, monitoring wells were purged using a pre-cleaned, two-stage, PCV submersible pump <br /> I <br />' Eight to nine gallons of water (a minimum of 3 casing-water volumes) were evacuated from <br /> wells MW-1 through MW-5 Temperature, pH and conductivity of the purged water were measured <br /> at regular purge-volume intervals in all wells with a Hydac water analyzer Logs of the field data are <br /> Iincluded in Appendix A Purged water was stored on-site in labeled 55-gallon drums <br /> II <br /> I <br />