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Draft Supplemental Environmental Impact Report Page IV.0-10 Forward Inc. Landfill 2018 Expansion Project 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. Mitigation Measure C.3. (Same as 2013 EIR Mitigation Measure C.3.) The Landfill shall implement one of the following wo options exist to mitigate this potentially significant impact: (a)Heavy equipment operations shall not be conducted within 1,500 feet of any occupied residence after 10 p.m. and before 7 a.m.; or (b)Equipment operations within 1,500 feet of any residence after 10 p.m. or before 7 a.m. shall be fully shielded from the direct line of sight to the residence by an earthen berm whose crown elevation exceeds the elevation of the top of the exhaust stack. Significance After Mitigation: Implementation of one or both of these mitigation measures would reduce this impact to a less than significant level.