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10/17/2007 14:37 FAX 2094683'R3 SJC_COMM_OEV Z 011/013 \W Ry' Response to Comment 12 San Joaquin County has approved several Conditional Use Permits for aggregate mining and/or reclamation in the same area as the Proposed Project,Detailed analysis of groundwater conditions, including the site-specific and cumulative impacts of groundwater pumping for quarry use,were including in the EIRs for the Granite Construction quarry and the AMC Pacific quant'.In particular,the RMC Pacific E1R notes that pumping rates of up to 1,000 gpm will have less than normal seasonal ation on the ater levels in nearby wells based on the seasonal fluctuations he lam fwtl only be approxiva Gates mately 200 20..to 40y gp� p bstantially demands,In contrast the water ss thanfor the plumping raQu� evaluated in the RMC Pacific Elk,H dro ahs of wells in the area indicate that,while water levels have fluctuated somewhat over the last 45 years,there has not been a substantial declining trend or cumulative impact on groundwater levels in the vicinity of the proposed project. The CEOA criterion for impacts to groundwater supplies states that the impact is significant when "_`the prndttcti0n_rate of Pre-existing nearby wells would drogta,�ley_el that would not support existing land uses or planned uses for which Permits have been granted" The mitigation options presented in Micigation Measure GW-3 on pns,:3-H.10 provides the County with a range of alternatives that can be implemented as part of an adaptive management strategy, including"other measures" as aonc'fiad in the last bullet of this mideation measureThese measures are adequate to protect the neiglibpT from actual physical or economic impayc_a that _would occur of significant reductions in water levels occur due to the Proiect. Response to Comment 13 Commencer references only portions of Mitigation Measure GW-3,"Monitor and Report Groundwater Levels;Implement Measures t0 Maintain Groundwater Levels as Necessary,"on page 3.H-7 of the Draft EIR. The full text of this measure reiterates the requirement for the applicant to establish a network of on-site sentinel and off-site monitoring wells to monitor baseline,or background,water level characteristics to detect any groundwater level impacts caused by the Project. The sentinel wells would be located on the project parcel and would be designed to detect impacts before they spread beyond the parcel boundaries. Off-site monitoring wells,which may include existing water supply wells,would be used to provide an ongoing,continuous baseline record to complement the monitoring at the sentinel sites. As further noted in the measure, if the groundwater monitoring resulted in a determination that the Project was adversely affecting groundwater levels,by reducing them such that local well owners were affected by a reduction in well production,the following measures would be implemented, listed in general order of implementation: Limit the depth of excavation,as determined by San Joaquin County,until corrective measures are approved by San Joaquin County and implemented by the Operator.