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5.Mitigation Monitoring and Reporting Program TABLE 5-1 MITIGATION MONITORING AND REPORTING PROGRAM CEMEX VERNALIS QUARRY PROJECT Mitigation Measure Responsible Party Monitor Timing Sign Off • List of on-site contacts, • Procedures to locate and account for on-site personnel, • List of current phone numbers for San Joaquin County sheriff and fire prevention,and City of Tracy Fire and Rescue,and • Post-earthquake facility structure and quarry pit inspections. The EPRP shall be provided to all employees and a copy shall be provided to local fire and rescue departments as well as to the facility file at the County of San Joaquin Community Development Department, The applicant shall update and redistribute when information changes or revisions are necessary. 4.8 HYDROLOGY AND WATER QUALITY .j x k <p. ". �,KZ '. l; ,n 4.8.1a: Excavation/Groundwater Separation.The project applicant,shall,at no time,extend the Applicant RWQCB Ongoing depth of excavation below the depth of the water table and shall maintain a vertical separation between the water table and the active mining surface. Determination of the water table depth shall be based on historic regional groundwater levels for the unconfined aquifer. The vertical separation shall be determined appropriate by a California-certified hydrogeologist or civil engineer but shall not be less than five feet.. 4.8.1b:Groundwater Elevation Monitoring Schedule.The applicant shall monitor groundwater to Applicant RWQCB October—April: ensure that the vertical separation between the nearest groundwater surface and the lowest point of Bimonthly and the active excavation and reclaimed phases is maintained as required by the California-certified within a week of a hydrogeologisl and at no less than five feet. The groundwater levels shall be monitored on-site prior major rain event. to and during all phases of excavation, prior to the initiation of excavation for each phase,and in the May—September: reclaimed phases. Groundwater shall be continually monitored in the active mining area on a Monthly. bimonthly basis,within a week following each large rainstorm from October through April,and Reclaimed Phases: monthly during the remainder of the year. Reclaimed phases shall be monitored once monthly, Monthly Monitoring technique shall be based on recommendations and approval by a California-certified hydrogeologist 4.8.3: Prior to the commencement of excavations,the project applicant shall conduct a Applicant Health Department Prior to Phase I comprehensive well survey to locate,identify,and confirm all existing groundwater wells on the (San Joaquin or (improvement plan project site.Information for well locations shall be obtained, if available,from DWR,San Joaquin Stanislaus,as approval or mining County Environmental Health Department,Stanislaus County,and the former property owners. appropriate) activity,whichever Groundwater wells that will not remain In operation shall be properly destroyed and removed in occurs first) Cemex Vernalis Quarry Mining and Redamallon Project 5-7 ESP 1203015 Final Environmental Impact Repon June 2000