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During closure the ur of any pit in which biosolids were used for disposal, an evaluation program will be initiated for proper gas detection, and monitoring if necessary, in accordance with the San Joaquin Valley Air Pollution Control District's Rule 4642, and any other applicable agency regulations and guidelines. In order to provide for the protection of public health and safety and the environment,the operator/owner will also follow the requirement(s) of Title 27, Section 20921 through 20937 pertaining to gas monitoring during closure and post-closure. As discussed in Chapter 4.1,the CIWMB has adopted a new rule which requires the same landfill gas monitoring and control requirements for active disposal sites that were previously only in place for closed disposal sites. When it becomes effective, the Project will be obligated to comply with the new requirements. As required in Mitigation Measure 4.1-4 the monitoring for and control of landfill gas emissions has been required. Impacts of this activity have therefore been evaluated. The air quality calculations for the Project assume worst-case levels of methane (biogas) emissions from the proposed 2,000 tons per day disposal of biosolids. If, in fact, biogas emissions at this level were to occur it would be possible to reduce greenhouse gas emissions, with their attendant indirect health impacts,by collecting and flaring such gasses. Finding Changes or alterations have been required in, or incorporated into the project that substantially lessen the potentially significant effect as identified in the Final EIR, so that environmental effects after such mitigation are reduced to a less than significant level. Brief Explanation of the Rationale for the Finding Pursuant to Public Resources Code Section 21081(a)(1), the Board of Supervisors finds that the project's adherence to Mitigation Measure 4.1-4 will reduce the potential impact of this significant effect to a less than significant level. Potential Significant Effect Without appropriate mitigation, the disposal of biosolids in the Prcject1SWFP area may generate the Y potential for fl generation nand other vector impacts. P fly p Description of Specific Impact The Federal Insecticide,Fungicide and Rodenticide Act(FIFRA)defines the term vector as: "any organism capable of transmitting the causative agent of human disease or capable of producing human discomfort or injury, including mosquitoes, flies, fleas, cockroaches, or other insects and ticks,mites or rats." None of the Project waste streams have an potential for vector generation J y p g ration except the biosolids. The essential habitat for, and the breeding and life cycle/disposal regimens and patterns, of flies, mosquitoes and other potential Project-related vectors will be first discussed. The Project design features related to the above will then be described, and additional mitigation measures, if appropriate,outlined. Findings of Fact—Section 15091 March 15,2016 H.M.Holloway Landfill Modification Project Final Board of Supervisors 34