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Draft Supplemental Environmental Impact Report Page IV.0-9 Forward Inc. Landfill 2018 Expansion Project The revised project includes the development of expansion areas within the permitted landfill boundary,but does not include the previously proposed horizontal expansion onto the adjoining 184- acre Brocchini property. Eliminating the 184-acre expansion area would reduce construction noise impacts by eliminating noisy construction activities on this property compared with the 2013 project. Construction noise impacts of the revised project would remain less than significant. Impact C.2. Truck Traffic Noise Impacts (Revises 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 slightly decreased levels of traffic noise impacts compared to those described in the 2013 EIR(due to refinements in modeling and truck-size assumptions). In addition,traffic noise impacts would occur for a shorter duration because the revised landfill closure date is 2036 instead of 2039. The 2018 modeled noise levels along the five roadway segments are presented in Table IV.0-4. The ambient conditions along all these road segments currently exceed 67 dBA, and the increases of 2.6 to 3.9 dBA that would be attributable to the project (at maximum permitted daily trips)would be considered significant along all segments except French Camp Road west of Austin Road. Therefore, impacts associated with project-generated traffic noise increases would be significant. The following measure was 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 would remain 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 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 shall 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.