SU0007861 - Laserfiche WebLink

Home Browse Search

Draft Environmental Impact Report Page IV.0-15 Forward Inc. Landfill Expansion The noise analysis found that the noise level increases attributed to the project would exceed the he roadway segments,including: Austin Road, south of Arch Road; Arch significance criteria at several of t Road,west of Austin Road;and Austin Road,north of the project driveway(see Table IV.0-4 column identified as "Change Existing+Project from Existing"). There are several residential sensitive receptors along Austin Road in this area that would be adversely affected by the noise levels associated with the proposed increase in daily truck traffic to the landfill. Therefore,impacts associated with project- 3 generated traffic noise increases would be potentially significant. �! f Mitigation Measure C.2. No mitigations are available for this impact other than reducing project operations. Such a reduction is a substantial change to the proposed project and therefore is addressed as a component of Alternative 2 (Reduced Project Alternative) in Chapter V. Therefore this impact is considered significant-and-unmttigable. Impact C.3. On-Site Landfill Equipment Noise Refuse disposal equipment would not change measurably in terms of its equipment type, manner of operation or amount of-equipment-used: 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 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 is unknown, the "default" analysis location is the property line of the receiving use. The FEIR for the Austin Road Landfill Expansion(1994)showed that landfill heavy equipment generates noise levels of up to 95 dBA Lmax at 50 feet from the source. The proposed Phase 1 lateral expansion is the closest expansion area to a sensitive receptor. A residence along Austin Road is approximately 1,300 feet south-southeast of the Phase 1 expansion area. Operation of heavy equipment at the Phase 1 expansion area could result in Lmax noise levels of up to 67 dBA at the nearest residence, which would result in a potentially significant noise impact. Mitigation Measure C.3. Two options exist to mitigate the project's potentially significant impact from equipment operations, as follows: (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. Implementation of one or more of these mitigation measures would reduce this impact to a less than significant level. Impact C.4. Cumulative Noise Impacts Traffic noise levels were modeled for two cumulative scenarios, including a near-term scenario that considers projects in the study area(i.e.,California Health Care Facility, Northern California Re-Entry Facility, and the Arch Road Industrial Project) that have already been approved but are not yet generating traffic and the 2035 scenario,which is based on the findings of the study of the proposed Mariposa Lakes development. The cumulative noise analysis found that the near-term and 2035 noise level increases attributed to the project would exceed the significance criteria at many of the roadway segments(see Table IV.0-4 columns