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6. OTHER STATUTORY CONSIDERATIONS Yn As shown by Table 4.5-51,in the Noise section,truck haul trips generated by Haul Route Option 1 would not contribute to increased noise levels along Segments 1-5. Under the cumulative scenario for Haul Route Option 1, Segments 6-8 would experience clearly noticeable noise level r increases of more than 5.0 dBA. This would be considered a cumulatively considerable significant impact. As shown in Figure 4.5-2,in the Noise section, there are approximately seven residences located on Segment 6 along a stretch that is approximately 1,500 feet long. Residences along Segment 7 include a cluster of four residences across a 1,000-foot stretch and a cluster of five residences along a 1,200-foot stretch. As mentioned above, three residents are located along a 500-foot stretch of Segment 8. Under Haul Route Option 2, the project would not contribute to increased traffic noise along Segments 1-4. Segments 5-8, however, would experience clearly noticeable noise level increases of more than 5.0 dBA. This would be considered a cumulatively considerable significant impact. Mitigation Measure 4.6.1: Implementation of Mitigation 4.53 would reduce noise levels experienced at residences located along project haul routes to less-than-significant levels. v Solid fences that provide attenuation of at least 7 dBA would adequately minimize truck noise at the affected residences along Segment 5 and Segment 8,reducing the impacts to a less-than- significant level. The minimum attenuation required by the sound barriers differs slightly among the segments r, impacted by the cumulative increase in noise. Under Haul Route Option 1,attenuation of at least 5 dBA would be required at those residences along Segment 6 and Segment 7, and attenuation of at least 7 dBA would be required at those residences along Segment 8. Under Haul Route r Option 2, the sound barrier shall provide a minimum attenuation of 5 dBA at those residences along Segments 6-8, and a minimum of 7 dBA at residences along Segment 5. ` Significance after Mitigation: With implementation of Mitigation Measure 4.6.1,the project's impacts would be mitigated to a less-than-significant level and therefore,the incremental distribution to cumulative impacts is less-than-significant. r GEOLOGY, SOILS,AND SEISMICITY The Proposed Project could result in potential geologic hazard impacts related to slope instability ` and seismic hazards. Similar to the other proposed and existing mining projects,the slope instability hazards would remain specific to the proposed RMC project site and be localized with the active mining area and therefore would not contribute to a region-wide cumulative slope r 1 Traffic volumes shown in Table 4.5-5 were derived from the Traffic Impact Study prepared by Peters Engineering Group,March 2004. RMC Pack Vemalis Quarry Mining and Reclamation Project 6-11 ESA/203015 Administrative Draft©R Mamh 2004