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' Draft Supplemental Environmental Impact Report Page IV.0-9 Forward Inc. Landfill 2018 Expansion Project 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. (Revises Same as 2013 EIR Mitigation Measure C.2.) (a)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. (b) For sections of Austin Road north of the landfill to Arch Road and south of the landfill to French ' Camp Road and Arch Road immediately west of Austin Road, residences within 100 feet of the centerline of Austin Road shall be provided with the option of requesting funds for installation of a sound barrier and/or additional insulation ' Significance After Mitigation: Mitigation Measure C.2 could reduce the impact of increased truck noise but nat to a level that would be less than significant, if residences request funding and implement the soundproofing measures. Other than Mitigation Measure C.2,no additional mitigations are available for this impact other than reducing project operations(Project Alternative 6). 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. Because the soundproofing is by request and may not be implemented by all residences that qualify, T -this impact is considered significant and unavoidable.