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Quarterly Report - January 1997 <br /> • RIPON FARM SERVICE <br /> 22871E South Highway 99 <br /> Ripon, California <br /> ' <br /> 10. INTRODUCTION AND SCOPE OF WORK <br /> ' In accordance with a request from Ripon Farm Service (RFS),Advanced GeoEiivironrnental, Inc <br /> (AGE) has prepared this report for ground water monitoring and sampling activities conducted at <br /> 22871 South Highway 99, Ripon, California (the site) The report documents the monitoring and <br /> sampling activities performed at the site on 22 January 1998, and the results of laboratory analysis <br /> of the samples The scope of work was to monitor ground water conditions and concentrations of <br /> ' dissolved petroleum hydrocarbons and selected fuel additives in ground water at the site The <br /> location of the site and its surroundings are illustrated in Figure 1 - Location Map Structures and <br /> monitoring well locations associated with the site are depicted in Figure 2 -Site Plan <br /> Background information, including details of previous site assessment work was presented in the <br /> April 1996 Quarterly Report prepared by AGE, dated 20 June 1996 <br /> Monitoring and sampling activities were conducted in accordance with both the San Joaquin County <br /> Public Health Services - Environmental Health Division (PHS-EHD) and the Central Valley <br /> ' Regional Water Quality Control Board (CVRWQCB) guidelines for the investigation of <br /> underground storage tank (UST) sites <br /> 2.0. PROCEDURES <br /> ' 2 1 MONITORING WELL PURGE PROCEDURES <br /> ' On 22 January 1998, a Solinst water level meter was used to measure the depth to ground water in <br /> wells MW-1 through MW-5 The relative ground water elevation in each well and hydraulic gradient <br /> were calculated from these data The depths to ground water are summarized in Table 1 -Relative <br /> ' Ground Water Elevation Data Each monitoring well was purged of approximately 8 gallons of <br /> water (a minimum of three well volumes) using a pre-cleaned, two-stage, submersible pump <br /> Temperature, pH, and conductivity were measured at approximately one-gallon intervals using an <br /> ICM Water Analyzer Model No 52200 The field data sheets are included in Appendix A Purged <br /> water was stored on-site in 55-gallon drums <br /> 2 2 GROUND WATER SAMPLE COLLECTION <br /> ' After purging of three well-volumes of water form each well, stabilization of ground water pH, <br /> temperature and conductivity readings, and restabilization of ground water elevation,water samples <br />