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6.Other Statutory Considerations — available to reduce NOx emissions to a less-than-significant level. These operational effects — would remain a significant impact after mitigation. Cumulative air quality impacts are also significant. The project would have a cumulatively — considerable contribution to regional ozone concentrations. In addition, although the impacts of particulate matter(PMio,PM2.5 and DPM[)from the project would be less than significant, when combined with the other projects in the area(including the quarries listed in Table 6-I),the — overall cumulative impact would be significant given the existing and projected near term non- attainment status of the area for PMnt, and PM2.5 standards.The project's contribution to regional air quality impacts would be significant. Hydrology and Water Quality Mining out Hospital Creek and constructing a berm to form a large detention basin (Mining Option 2)would substantially alter the natural hydrology of Hospital Creek. This option would permanently remove surface water flows from the reach of Hospital Creek downstream of the proposed mining operations leading to depletion of flows to downstream receiving water bodies, reduction of surface water available for localized infiltration, or elimination of adequate water _ flow for aquatic and riparian habitats. Removal of Hospital Creek from within the boundaries of the project site could result in adverse impacts to downstream hydrology and recharge and there is uncertainty as to the magnitude of these impacts. If Mining Plan Option 2 is identified as the — preferred approach to mining adjacent to Hospital Creek,then the impacts to hydrology would be significant. 6.4 Significant Irreversible Environmental Changes That Would Result from the Proposed Project - Should It Be Implemented 6.4.1 Introduction The CEQA Section 21100(b)(2)and CEQA Guidelines Section 15126.2(b) require that any significant effect on the environment that would be irreversible if the project is implemented must be identified. Significant irreversible environmental changes include the project's direct and indirect effects that will commit nonrenewable resources to uses that future generations would most likely be unable to reverse. 6.4.2 Significant Irreversible Environmental Changes The primary irreversible changes that would occur as a result of the project include: — • Implementation of the project would require the irreversible commitment of natural resources,the mining and processing of aggregates that would decrease the availability of aggregate resources in the future. RMC Pacific Vernalis Quarry Mining and Reclamation Project 6-18 ESA 1203015 Draft Environmental Impact Report May 2006