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Quarterly Report - March 1997 <br /> RIPON FARM SERVICE <br /> ' 22871 South Highway 99 <br /> Ripon, California <br /> ' 10. INTRODUCTION AND SCOPE OF WORK <br /> ' In accordance with a request from Ripon Farm Service (RFS),Advanced GeoEnvironmental, Inc <br /> (AGE)has prepared thus report for 22871 South Highway 99,Ripon, California(the site) The report <br /> details quarterly monitoring and sampling activities performed at the site in March 1997 The scope <br /> of work was to assess and monitor the lateral extent and concentrations of hydrocarbon-impacted <br /> ground water at the site The location of the site and its surroundings are illustrated in Figure 1 - <br /> ' Location Map Structures and monitoring well locations associated with the site are depicted in <br /> 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 /> ' 20. PROCEDURES <br /> ' 21 MONITORING WELL PURGE PROCEDURES <br /> On 27 March 1997, 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 Elevations Each monitoring well was purged of approximately 10 gallons of water <br /> ' (a minimum of three well volumes)using a pre-cleaned,two-stage,submersible pump Temperature, <br /> pH, and conductivity were measured at approximately one-gallon intervals using an ICM Water <br /> Analyzer Model No 52200 Purge water stabilization data and field data sheets are included in <br /> ' Appendix A Purged water was stored on-site in 55-gallon drums <br /> ' 2 2 GROUND WATER SAMPLE COLLECTION <br />' After stabilization of ground water pH, temperature and conductivity readings and ground water <br /> elevation had stabilized, water samples were collected from each well using new, clean, disposable <br /> plastic bailers The samples were transferred into 40-m1 EPA-approved VOA vials and into 1-liter <br /> 1 <br />