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Draft Supplemental Environmental Impact Report Page IV.0-11 Forward Inc. Landfill 2014 Expansion Project 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 in the proposed new fill areas 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 does however include an 8.72-acre expansion of operations in the northeast area of the landfill and construction of an approximately 30-acre landfill footprint(of which 6.7 acres would be newly permitted) at the southeast corner of the landfill. These two areas include new noise generated by 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.) Two 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. Impact CA. Cumulative Traffic Noise Impacts(Same as 2013 EIR Impact C.4.) In the 2013 EIR, traffic noise levels were modeled for two cumulative scenarios, including a near-term — scenario that considers projects in the study area and the 2035 scenario, which is based on the findings of the study of the proposed Mariposa Lakes development. The cumulative noise analysis in the 2013 EIR found that the near-term and 2035 noise level increases attributed to increased traffic from other planned development and the increased project truck traffic would exceed the significance criteria at many of the roadway segments. As discussed earlier, traffic generated by the revised project remains the same as the traffic in the 2013 EIR, but with Landfill closure in 2031 instead of 2039. The modeled traffic noise levels remain the same,except the 2035 scenario is replaced with a 2031 scenario since the revised project will close before 2035. — Cumulative traffic noise level increases for the revised project are the same as the noise level increases in the 2013 EIR and are shown in Table IV.0-4(columns identified as"Change Existing+Project+Cum from Existing";"Change 2031 Cum NP from Existing NP";and "Change 2031 + Proj from Existing NP"). The table shows that the noise levels would increase in 2031 by a significant amount(compared to the existing levels)before addition of the noise from the increased project truck traffic. The additional truck traffic noise that would be associated with the proposed project would further increase traffic noise and contribute to a significant cumulative noise impact.