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D.1.3. Air Quality Impact 4.6.3 Project Odor Impact. The impact of odors from the project would be less than significant. No mitigation is required. (Draft EIR, pp. 4.6-25 to 4.6-26.) Impact 4.6.5 Project Carbon Monoxide Impact. Traffic generated by the project would have the potential to affect CO concentrations along surface streets and near stagnation points such as major highways and heavily traveled and congested roadways. This increase in traffic would not only add more vehicles on the road but the increased congestion would cause non project traffic to travel at slower speeds, thus increasing CO emissions. This impact less than significant. No mitigation is required. (Draft EIR, pp. 4.6-28 to 4.6-30.) D.1.4. Geology. Soils, and Seismicity Impact 4.7.1 The steepness of temporary excavation slopes proposed during active mining could reach 'y,:1 Horizontal to Vertical(H.V) and therefore could be subject to instability under certain static conditions or during an earthquake. However, any failure of temporary slopes would be limited to the immediate work area. The proposed permanent 2:1 (H.-V) slopes could fail during moderate and strong earthquake ground shaking. Failure of the permanent 2:1 (H.V) during an earthquake slopes could hamper future,post-mining reclamation efforts by increasing the potential for long-term slope instability. However, any future landslide failure ofpermanent slopes would occur within a remote, reclaimed area, and would not expose people or property to substantial adverse effects. In addition, the permanent slope safetyfactor exceeds the minimum factor of safety established by the County. These effects would be less than significant. No mitigation is required. (Draft EIR, pp. 4.7-15 to 4.7-19.) Impact 4.7.2 Activities related to quarry operations that cause disturbance of surface soils would expose loose soil materials. Exposure of these soils to wind, rain, and concentrated runoff could cause localized erosion that could eventually damage the engineered earthen features. Erosion damage to these features could expose workers to injury and equipment to damage. Surface drainage in the mining area will be directed to open mining pits, and the erosion and sediment control plan will ensure that impacts remain less than significant. No mitigation is required. (Draft EIR,pp. 4.7-19 to 4.7-20.) Impact 4.7.3 Permanent reclamation slopes could be subjected to excessive soil erosion, resulting in rilling, gullying, debris flows, and berm damage. This would be a less-than significant impact given the project's erosion control plan. No mitigation is required. (Draft EIR, pp. 4.7-20 to 4.7-21.) 6