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I ' <br /> Quarterly Report - Second Quarter 2002 <br />' JIMCO TRUCK PLAZA <br /> 22502 South Highway 99, Ripon, Califomia <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 Junco 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 ofthis report The location of the site and the immediately surrounding area are illustrated <br /> on Figure 1, structures and boring and monitoring well locations on the site are illustrated on <br /> IFigure 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 underground <br /> storage tank(UST)sites Background information,including details ofprevious site assessment work, <br /> was presented inAGE's report titled Preliminary Investigation and Evaluation Report(PIER),dated <br />' 13 December 1999 <br />' . 2.0 PROCEDURES <br /> 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)for <br /> sampling of ground water monitoring wells <br /> I <br /> 2 1 WELL MONITORING AND EVACUATION <br />' On 20 June 2002, a Solinst water level meter was used to measure the depth to giound water from <br /> the well casing tops in wells MW-1 thi ough MW-8 The depths to ground water are summarized in <br />' Table 1 <br /> After water levels were gauged, a pre-cleaned„ dedicated disposable bailer was used to purge each <br /> I monitoring well of a rrunimurn of three casing-water volumes (approximately 4 to 5 gallons) of <br /> ground water Temperature, pH, and conductivity were measured at approximately one-gallon <br /> intervals using a Hydac Water Analyzer The field data sheets are included in Appendix A Purged <br />' water was stored on site in 55-gallon dru-rns <br />' 22 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 90%of the initial water volume had i echarged Watei samples were <br />