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I <br /> Quarterly Report - Second Quarter 2001 <br />' Jimco Truck Plaza <br /> 22502 South Highway 99,Ripon, California <br />' 1.0. INTRODUCTION <br /> At the request of Mr Rusty Firenze of Olympian Oil Company, Advanced GeoEnvironmental, Inc <br />' (AGE)has prepared this quarterly report for the Janco Truck Plaza, located at 22502 South Highway <br /> 99, Ripon, California(the site) <br />' The scope of work included groundwater monitoring and sampling of eight monitoring wells and <br /> one domestic well located on the site The location of the site with respect to its surroundings is <br /> illustrated on Figure 1 Buildings and monitoring well locations on the site are depicted on Figure 2 <br />' Background information, including details of previous site assessment work, was presented in <br /> AGE's report titled Preliminary Investigation and Evaluation Report (PIER), dated 13 <br />' December 1999 <br />' 2.0 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 Field work and report <br /> preparation were conducted in accordance with guidelines established by the San Joaquin County <br />' Public Health Services - Environmental Health Division (PHS-EHD) and by the Central Valley <br /> Regional Water Quality Control Board (CVRWQCB) for the investigation of underground storage <br /> tank (UST) sites <br /> I � , <br /> 2 1 MONITORING WELL PURGE PROCEDURES <br />' On 10 April 2001, a Sohnst water level meter was used to measure the depth to ground water from <br /> the well casing tops in wells MW-1 through MW-8 The depths to ground water are summarized in <br />' Table 1 <br /> After water levels were gauged, a pre-cleaned submersible pump was used to purge each monitoring <br />' well of a minimum of three casing-water volumes (approximately 6 gallons) of ground water <br /> Temperature,pH, and conductivity were measured at approximately one to one and one-half-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 dnu is <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 />