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1 1 t I t 1 I 1 I 1 ( I f f f i fi C 1 2. EXECUTIVE SUMMARY TABLE 2-1 (Continued) SUMMARY OF IMPACTS AND MITIGATION MEASURES LEVEL OF ENVIRONMENTAL IMPACT MITIGATION MEASURES SIGNIFICANCE AFTER MMGATION 4.8.1b Maintaining Excavation/Groundwater Separation In the event that the water table level increases unexpectedly over a short period of time or an increase occurs that is not identified through monitoring(see Mitigation Measure 4.8.1c) and the water table rises to an elevation less than the required separation distance,the applicant shall cease vertical excavation in the affected area and place surface fill on the basal mining surface to establish the required separation. Fill placement shall be supervised by a California-certified engineering geologist and be engineered by a California-registered civil engineer to adequately support heavy equipment. 4.8.1c Groundwater Elevation Monitoring Schedule Less-than-Significant The applicant shall monitor groundwater to ensure that the vertical separation between the nearest groundwater surface and the lowest point of the active excavation and reclaimed phases is maintained as required by the California-certified hydrogeologist or at no less than 5 feet. The groundwater levels shall be monitored onsite prior to and during all phases of excavation,prior to the initiation of excavation for each phase, and in the reclaimed phases. Groundwater shall be continually 7 mor n +n rhe anti ve mininc area on a bi-monthl basis and within a week followini;each lazeyrainstorm from Octo Tr through April,and on a monthly basis 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. RMC Pack Vemaas Quarry Mining end Rede don Project 2-19 ESA/203015 Administrative Dmn FIR Mmsh 2004