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• • • Draft Supplemental Environmental Impact Report Page IV.0-10 • Forward Inc. Landfill 2018 Expansion Project 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. Significance After Mitigation: Mitigation Measure C.2 could reduce the impact of increased truck noise but not to a level that would 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 Impacts (Revises 2013 EIR Impact C.3.) 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 2013 EIR, refuse disposal equipment would not change measurably in terms of its equipment type, . manner of operation or amount of equipment used and any possible operational equipment noise • difference would be almost exclusively due to the changed location of the disposal equipment under the lateral expansion during the life of the landfill. The revised project would not include the previously proposed horizontal expansion of landfilling operations onto the adjoining 184-acre Brocchini property, therefore eliminating noise impacts that would occur from landfill equipment on . that parcel. The revised project includes changes to the landfill footprint in the northeast and southeast of the site (see Chapter II, Project Description). These two areas would be the location of noise from new landfill • equipment operations. A residence along Austin Road is approximately 1,300 feet south-southeast of • the northeast expansion area. The County noise ordinance restricts the noise level at any noise- sensitive receiving property to an Lmax of 65 dBA between 10:00 p.m. and 7:00 a.m. and 70 dBA between 7:00 a.m. and 10:00 p.m. If the location of any outdoor activity area is unknown, the "default' analysis location is the property line of the receiving use. The operation of heavy equipment at the • northeast expansion area could result in Lmax noise levels up to 67 dBA at the nearest residence, which • would result in a potentially significant impact.