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' Quarterly Report - Third Quarter 2002 <br /> JIMCO TRUCK PLAZA <br />' 22502 South Highway 99, Ripon, California <br />' 1.0. INTRODUCTION <br /> At the request of Mr Dan Koch of Olympian Oil Company, Advanced GeoEnvironmental, Inc <br />' (AGE)has prepared this quarterly report for the Jimco Truck Plaza,located at 22502 South Highway <br /> 99,Ripon, California(the site) The scope of work included quarterly ground water monitoring and <br />' preparation of this report The location of the site and the immediately surrounding area are <br /> illustrated on Figure 1, structures and boring and monitoring well locations on the site are illustrated <br /> 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, was presented in AGE's report titled Preliminary Investigation and Evaluation <br /> Report(PIER), dated 13 December 1999 <br /> I <br /> 2.0 PROCEDURES <br /> lie Field work was conducted in accordance with guidelines established by the CVRWQCB for the <br /> investigation of UST sites and the San Joaquin County Environmental Health Department (EHD) <br />' for sampling of ground water monitoring wells <br />' 2 1 WELL MONITORING AND EVACUATION <br /> On 19 September 2002, a Sohnst water level meter was used to measure the depth to ground water <br /> Ifrom the well casing tops in wells MW-1 through MW-8 The depths to ground water are <br /> summarized in Table 1 <br />' After water levels were gauged, disposable plastic bailers were used to purge the monitoring wells <br /> of a minimum of three casing-water volumes (approximately 4 to 6 gallons) of ground water <br />' Temperature, pH, and conductivity were measured at approximately two-gallon intervals using an <br /> Oakton Water Analyzer The field data sheets are included in Appendix A Purged water was stored <br /> on site in 55-gallon drums <br /> I <br /> 2 2 GROUND WATER SAMPLE COLLECTION <br />' Prior to the collection of ground water samples, the depth to ground water was re-measured in each <br /> . well to ensure that a minimum of 80% of the initial water volume had recharged Water samples <br /> I <br /> I <br />