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I EXECUTIVE SUMMARY TABLE 2-1 (Continued) SUMMARY OF ITVIPACTS AND MITIGATION MEASURES LEVEL OF ENVIRONMENTAL IMPACT MITIGATION MEASURES SIGNIFICANCE AFTER MITIGATION 4.8.2 Accidental spill,leaks,or improper disposal of 4.8.2 Implement Mitigation Measure 4.11.2. Less-than-Significant petroleum fuel would increase the potential for degradation of groundwater quality over the life of the project. This would be a significant impact without mitigation prescribed as part of this EIR. 4.8.3 Excavation that disturbs and/or truncates the existing 4.8.3 Prior to the commencement of excavations,the project applicant Less-than-Significant groundwater well shafts on the project site could shall conduct a comprehensive well survey to locate,identify, increase the potential for contaminants to enter and and confirm all existing groundwater wells on the project site. pollute the groundwater through the wells. This would Information for well locations shall be obtained,if available, be a significant impact without mitigation prescribed as from DWR,San Joaquin County,Stanislaus County,and the part of this EIR. former property owners. Groundwater wells that will not remain in operation shall be properly destroyed and removed in accordance with the DWR Well Standards. The well destruction shall be 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. 4.8.4 Groundwater extraction associated with the proposed 4.8.4a Single Well Pumping Testing Less-than-Significant project could lower groundwater levels in areas beyond the boundaries of the project site resulting in Prior to commencing mining operations,the project applicant groundwater drawdown through the life of the project. ( shall complete a single well E2!�4ng test n those supply wells Excessive groundwater level decline could deplete a intended for extractionunng mining operations. The objective available groundwater resources by lowering local or of this well test is to evaluate the ability of the supply well(s)to regional groundwater levels below the current pumping maintain the discharge rate desired for the proposed operation depths of existing private or municipal groundwater and to determine a time-drawdown relationship. The pumping supply wells. This would be a significant impact tests shall be performed under the temporary and long-term without mitigation prescribed as par of this EIR. pumping scenarios. The aquifer testing shall be completed by a California-certified hydrogeologist with experience with the Sacramento-San Joaquin groundwater system. The test shall RMC Pacific vemelis Qaany Mining and Rectanation Pmiect 2-20 ESA 203015 Administrative Draft Ent March 2004