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Draft Supplemental Environmental Impact Report Page IV.0-9 Forward Inc. Landfill 2014 Expansion Project Impact C.2. Truck Traffic Noise Impacts (Same as 2013 EIR Impact C.2.) The 2013 EIR determined that noise level increases attributed to the project would exceed the significance criteria at residential properties along each of the five roadway segments throughout the project area where residences would be most affected by the project. The revised project would result in the same level of traffic noise impacts as those described in the 2013 EIR. However traffic noise impacts would occur for a shorter period because the revised landfill closure date is 2031 instead of 2039. The modeled noise levels along the five roadway segments would be the same as modeled levels in the 2013 EIR and are presented in Table IV.0-4. The ambient conditions along these road segments currently exceed 65 dBA, and the increases of 3.6 dB to 4.4 dBA that would be attributable to the project (at maximum permitted daily trips) would be considered significant. The most obtrusive noise would be the morning peak hour trips;the traffic report estimates that approximately 17% of all project trips would occur in the morning peak hour. Therefore,impacts associated with project-generated traffic noise increases would be significant. The Following measure is proposed as part of the project: • As recommended mitigation in the 2000 EIR and implemented by the applicant, the landowner or tenant at 9690 Austin Road shall be provided with the option of requesting a sound wall or — noise barrier to reduce noise exposure both in the front yard and within the home. Additional noise monitoring and measures will be undertaken to demonstrate compliance with Development Title Section 9-1025.9 Transportation Noise Sources in the event noise complaints _ are received. This measure would reduce noise at the applicable house but would not mitigate noise impacts to other residences. Therefore this impact is significant and unavoidable. It should be noted that sound barriers are not feasible in the semi-rural areas that would be affected by truck traffic increases, because the barriers would be far removed from the activity areas of sensitive receptors and the sound barriers would generally be an unnatural barrier not only to noise but also to distant views now possible in these areas. Mitigation Identified in This EIR: Mitigation Measure C.2 (Same as 2013 EIR Mitigation Measure C.2.) To reduce truck traffic noise impacts, the landfill operator shall annually notify truck drives with a flyer that encourages drivers to maintain a steady speed on surface roads leading to the landfill. Drivers should be instructed to eliminate unnecessary noise by staying within the speed limit and travelling at a steady speed, especially for trips during the morning peak hours. Significance After Mitigation: Mitigation Measure C.2 could reduce the impact of increased truck noise but not to a level that would v be less than significant. Other than Mitigation Measure C.2,no additional mitigations are available for this impact other than reducing project operations. Reducing project operations would be a substantial change to the proposed project and therefore is addressed as a component of Alternative 2B (Reduced Size/Reduced Daily Operations Alternative) in Chapter V of the 2013 EIR. Therefore this impact is considered significant and unavoidable. — Impact C.3. On-Site Landfill Equipment Noise The 2013 EIR determined that noise from on-site landfill equipment would result in a potentially significant impact at the sensitive receptor closest to the northeast expansion area. As described in the