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r r t r r r r r r r r r r r r r r r r <br /> 2.Executive Summary <br /> TABLE 2.1 (CONTINUED) <br /> SUMMARY OF IMPACTS AND MITIGATION MEASURES <br /> Environmental Impact Mitigation Measures Level of Significance <br /> (Level of Significance Prior to Mitigation) After Mitigation <br /> 4.6.6 Project DPM Impact of Haul Trucks.Traffic generated by 4.6.6 No mitigation is required. <br /> the project would have the potential to affect DPM <br /> concentrations along surface streets and near stagnation <br /> points such as major highways and heavily traveled and <br /> congested roadways.This impact is a less-than- <br /> significant impact. (LS) <br /> 4.6.7 Project TACs Impact from Asphalt operations. No mitigation is required. <br /> Implementation of the Proposed Project may lead to <br /> increases in chronic exposure of nearby sensitive <br /> receptors to certain toxic air contaminants from the <br /> asphalt batching operations.This impact is less than <br /> significant. <br /> Geology,Soils,And Seismicity <br /> 4.7.1 The steepness of temporary excavation slopes proposed No mitigation is required.. <br /> during active mining could reach%:1 Horizontal to <br /> Vertical(H:V)and therefore could be subject to instability <br /> under certain static conditions or during an earthquake. <br /> The proposed permanent 2:1 (H:V)slopes could fail <br /> during moderate and strong earthquake ground shaking. <br /> Failure of the permanent 2:1 (H:V)during an earthquake <br /> slopes could hamper future,post-mining reclamation <br /> efforts by increasing the potential for long-tens slope <br /> instability.These effects would be less than significant. <br /> (LS) <br /> 4.7.2 Activities related to quarry operations that cause No mitigation is required. <br /> disturbance of surface soils would expose loose soil <br /> materials.Exposure of these soils to wind,rain,and <br /> concentrated runoff could cause localized erosion that <br /> could eventually damage the engineered earthen <br /> features.Erosion damage to these features could expose <br /> workers to injury and equipment to damage.This would <br /> be a less-than-significant impact.(LS) <br /> RMC Pacific vernalis Quarry Mining and Reclamation Project 2-13 ESA/Project No 203015 <br /> Draft Environmental Impact Report May 2006 <br />