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I EXECUTIVE SUMMARY TABLE 2-1 (Continued) SUMMARY OF IMPACTS AND MITIGATION MEASURES LEVEL OF ENVIRONMENTAL IMPACT MITIGATION MEASURES SIGNIFICANCE AFTER MITIGATION 4.6.6 Project DPM Impact of Haul Trucks. Traffic generated 4.6.6 Project DPM Impact of Haul Trucks. Retrofit non-road Less-than-Significant by the project would have the potential to affect DPM equipment engines with CARB-certified DPM filters and concentrations along surface streets and near stagnation catalysts while using ULSD,when available. This would points such as major highways and heavily traveled and reduce DPM emissions from equipment by 85 percent. congested roadways. This impact is significant. Implementation of ULSD and DPM filters on all haul trucks would reduce the carcinogenic risk to an estimated 9.72 and 4.13 cancers per million for Haul Route Options I and 2, respectively. GEOLOGY AND SOILS/SEISMICITY 4.7.1 The steepness of temporary excavation slopes proposed 4.7.1a Site-Specific Geotechnical/Slope Stability Investigation Less-than-Significant during active mining could reach s/4:1 (Horizontal to Vertical)and therefore could be subjected to instability Prior to implementation of the proposed mining project,the under certain static conditions or during an earthquake. applicant shall conduct a site-specific geotechnical/slope Failure of temporary slopes in an active mining stability investigation to verify and update findings in the environment could cause landslides and subject a preliminary study prepared by Geomatrix in 2002. The limited number of workers to injury and could result in geotechnical/soil stability investigation shall include some equipment damage. The proposed permanent appropriate,site-specific geologic exploration and engineering 2:l(H:V)slopes could fail during moderate and strong soil testing to adequately assess the soil properties and the soil earthquake ground shaking. Failure of the permanent strength characteristics beneath the proposed site. The 2:1(H:V)during an earthquake slopes could hamper geotechnical/slope stability investigation shall use soil data future,post-mining reclamation efforts by increasing the collected on the proposed site from the proposed mining area to potential for long term slope instability. This would be perform a slope stability analysis. The slope analysis shall a potentially significant impact without mitigation. consider the stability of the proposed temporary and permanent RMC Pacific Vemalis Quaay Muting and Reclamation Project 2-13 ESA/203015 AdminislmOarc ve Dma Eat March 2004