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i MOUNTAIN HOUSE NEIGHBORHOODS K AND L INITIAL STUDY 5.ENVIRONMENTAL CHECKLIST 11. NOISE } For the Neighborhoods K and L project,the main concern would be potential exposure of project residents to noise levels that exceed applicable standards. Non-residential uses proposed by the project(e.g., commercial uses, schools, �. parks)would be unlikely to be exposed to excessive noise. The Neighborhoods K and L project plans include berms and sound walls to 1 maintain noise levels at or below an Ldn of 65 dB in primary outdoor use areas of _ future residential development,as described below. Byron Road/Union Pacific Railroad. Table 5.11-2 shows existing and future noise levels along road segments in the project site vicinity. Noise levels along the Byron Road/Union Pacific Railroad corridor are expected to increase. Future I traffic volumes on Byron Road are expected to increase from 7,105 average daily M vehicles(existing)to 34,865 average daily vehicles(2035 plus Project). Speeds would likely be reduced as compared to the existing speed on the road due to stop lights and signage,and the overall truck percentage would be slightly lower than it is today. While the resulting noise level is expected to be higher than what exists today, Fi the Ldp in the yards of the closest proposed homes would be less than 65 Ldp without mitigation. Neighborhood L would include a sound wall along the future Mountain House Parkway at the entrance to the neighborhood. The wall would be approximately 7 feet high relative to the rear yards of the closest homes(see Figure 5.11-1). Trains on the Union Pacific Railroad do not currently represent a noise problem. There is only about one train per year on the track and there are no plans for a significant change in the use of the tracks. The rail might be used in the future { for a commuter-type operation similar to the Ace Train with up to four trains per I day. If the Ldp associated with this activity would be above 65 dB outside of the closest homes, additional mitigation would need to be incorporated at the time the new train service is proposed. Future development on the north side of Byron Road would be consistent with the guidelines of the Master Plan. Future noise levels outside of the closest residential units on the north side of Byron Road would be as high as an Ldp of 62 dB but below the 65 dB threshold. Additionally,the transit station and community commercial development may block the view and result in increased attenuation from traffic noise to the outdoor activity use areas of the closest sensitive receptors. Farther east along Byron Road,there are one or two homes on the south side of Byron Road(outside the project site)that may be affected by increased traffic. Specific Plan II (SPII)indicates that noise mitigation for these homes will be addressed at the time of the proposed road widening for Byron Road. Project-Proposed Road Improvements. Roadway improvements for the proposed project are expected to include the following: Central Parkway would be extended north to Old River, Mountain House Parkway would extend north to Fi (snn 11 5-139 ! i