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1 , <br /> Quarterly Report - Fourth Quarter 2001 EN IRONMEMT <br />' Jimco Truck Plaza Ue ERM!7'ISF 41C 5 LTl~f <br /> 22502 South Highway 99, Ripon, California <br />' = f <br /> 10, INTRODUCTION 1U01 <br /> E ' +H <br /> At the request of Mr Rusty Firenze of Olympian Oil Company, Advanced GeoEnvironnaen'ta1,Uic <br />' (AGE)has prepared this quarterly report for the Jimco Truck Plaza,located at 22502 South Highway <br /> 99, Ripon, Cala forma (the site) <br />' The scope of work included groundwater monitoring and sampling of eight monitoring wells located <br /> on the site The location of the site with respect to its surroundings is illustrated on Figure 1 <br />' Buildings and monitoring well locations on the site are depicted on Figure 2 <br /> Background information,including details ofprevious site assessment work,was presented in AGE's <br />' report titled Preliminary Investigation and Evaluation Report (PIER), dated 13 December 1999 <br /> This report has been prepared in accordance with guidelines established by the Central Valley <br /> Regional Water QualityControl Board(CVRWQCB)forthe subsurface investigationof underground <br /> Istorage tank (UST) sites <br /> r <br /> pe 20 PROCEDURES <br /> The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground <br /> water and characterize ground water flow direction and gradient on the site <br /> Field work was conducted in accordance with guidelines established by the San Joaquin County <br /> IPublic Health Services -Environmental Health Division(PHS-EHD) for sampling of ground water <br /> monitoring wells and CVRWQCB for the investigation of UST sites <br /> 2 1 MONITORING WELL PURGE G PROCEDURES <br /> lOn 05 October 2001, a Solinst water level meter was used to measure the depth to ground water <br /> from the well casing tops in wells MW-i through MW-8 The depths to ground water are summarized <br /> in 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 minimum of three casing-water volumes (approximately 3 to 5 gallons) of <br /> ground water Temperature, pH,, and conductivity were measured at approximately <br /> three-quarter-gallon and one-gallon intervals using an Oakton Water Analyzer The field data sheets <br /> Iare included in Appendix A Purged water was stored on site in 55-gallon drums <br /> I <br />