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Draft Supplemental Environmental Impact Report Page VIII-94 Forward Inc.Landfill 2018 Expansion Project The following text on page on Page IV.0-10 of the DSEIR has been revised as follows (additions underlined, deletions in strip): 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, 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=herefore this impact is considered significant and unavoidable. Also, the last paragraph on page IV.0-11 has been revised as follows (additions underlined, deletions in ): As stated in the 2013 FEIR Summary of Impacts and Mitigation Measures Table, ' no feasible mitigation measures are available to reduce the projects contribution to cumulative noise impacts. It should be noted that sound barriers are not ' feasible in the semi-rural areas that would be affected by cumulative 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.would minimize noise increases (for residences that implement the soundproofing),however 44ttts,no mitigations guarantee •,`ble 1 reducing all noise increases for this cumulative impact other than reducing project operations. Such a reduction 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 FEIR(see Alternative 6). Therefore, the project's noise increment is considered to be cumulatively considerable and the cumulative traffic noise impact is considered significant and unavoidable. L-11. The comment asserts that the contaminated groundwater plume is not controlled. See responses to comments J1 and J2, above;the area of uncontrolled groundwater is ' well north of the proposed expansion areas,which are located downgradient of the extraction wells and Groundwater Treatment System.The proposed infill areas would not measurably affect that with implementation of the mitigation measures identified in this SEIR. L-12. Please see response to comment J-15, above. '