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Quarterly Report Second Quarter 2000 Jimco Truck Plaza ' 22502 South Highway 99, Ripon, California r 1.0 INTRODUCTION At the request of Mr Rusty Fii enze of Olympian Oil Company, Advanced GeoEnvironmental, Inc ' (AGE) has prepared the enclosed Quarterly Report for the Jimco Truck Plaza, located at'22502 South Highway 99, Ripon, California(the site) ' The scope ofwoi k included groundwatet monitoring and sampling of eight monitoring wells and one domestic well located on the site The location of the site with respect to its surroundings is illustrated on Figui e 1 Buildings and monitoring well locations on the site are depicted on Figure 2 ' Background information,including details ofprevious site assessment work,was presented in AGE's report titled Preliminary Investigation and Evaluation Report (PIER), dated 13 December 1999 2.0 PROCEDURES ' The objective ofthe work was to monitor dissolved petroleum hydrocarbon concentrations in ground water and characterize ground water flow direction and gradient on the site Field work and report lieprepay ation are in accoi dance with guidelines established by the San Joaquin County Public Health Sei vices - Envii onmental Health Division (PHS-EHD) and by the Central Valley Regional Water ' Quality Control Boar d(CVRWQCB) for the investigation of underground storage tank(UST) sites 2 1 MONITORING WELL PURGE_ PROCEDURES On 02 May 2000, a Solmst water level meter was used to measure the depth to ground water from ' the well casing tops in wells MW-4 through MW-8 The depths to ground water are summarized in Table 1 The ground water was re-gauged on 20 June 2000 ' After water levels were gauged,a submersible pump was used to purge each monitoring well of three well volumes(approximately 6 gallons) of ground water using a pre-cleaned,two-stage submersible pump"Temper atui e,pH,and conductivity were measured at approximately two-gallon intervals using a Hydac Water Analyzer The field data sheets'are included in Appendix A Purged water was stored on site in 55-gallon drums 22 GROUND WATER SAMPLE COLLECTION Prior to the collection of ground water samples, the depth to ground water was re-measured in each • well to ensui e that a minimum of 80%of the initial water volume had recharged Water samples were then collected from each well using a new disposable plastic bailer The water was transferred into I r