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r r r r r r r r r r r r r r t t r r r 5.Mitigation Monitoring and Reporting Program TABLE 5-1 MITIGATION MONITORING AND REPORTING PROGRAM CEMEX VERNALIS QUARRY PROJECT Mitigation Measure Responsible Monitor Timing Sign Off Party • 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 4.8.1a: Excavation/Groundwater Separation.The project applicant,shall,at no time,extend the depth of Applicant RWQCB Ongoing 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 ensure that the Applicant RWQCB October—April:Bimonthly vertical separation between the nearest groundwater surface and the lowest point of the active excavation and and within a week of a major reclaimed phases is maintained as required by the California-certified hydrogeologist and at no less than five feet. rain event. The groundwater levels shall be monitored on-site prior to and during all phases of excavation,prior to the May—September:Monthly. initiation of excavation for each phase,and in the reclaimed phases. Groundwater shall be continually monitored Reclaimed Phases:Monthly in the active mining area on a bimonthly basis,within a week following each large rainstorm from October through April,and monthly during the remainder of the year. Reclaimed phases shall be monitored once 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 comprehensive well Applicant Health Prior to Phase I survey to locate,identify,and confirm all existing groundwater wells on the project site.Information for well Departmen (improvement plan approval locations shall be obtained,if available,from DWR, San Joaquin County Environmental Health Department, t(San or mining activity,whichever Stanislaus County,and the former property owners.Groundwater wells that will not remain in operation shall be Joaquin or occurs first) properly destroyed and removed in accordance with the DWR Well Standards,depending on location,under Stanislaus, permit and inspection from either the Stanislaus County Department of Environmental Health or San Joaquin as County as per the San Joaquin County Development Title,Section 9-1115.5(e).The well destruction shall be appropriate designed to create a sanitary seal that would not conduct vertical water flow in the event that the well is truncated ) or damaged during mining operations. 4.8.6:The applicant shall implement the Mining Plan Option 1 as described in Chapter 3.0, Project Description, Applicant CDD Prior to approval of and shown graphically in Figure 3-3.Mining Plan Option 1 requires the applicant to leave Hospital Creek in place, improvement plans mining both sides with a 100-foot setback from the centerline of the creek to the top of the mining slope. Cemex Vernalis Quarry Mining and Reclamation Project 5-7 ESA 1203015 Final Environmental Impact Repor[ June 2008