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incorporated into,the project that substantially lessen the potentially significant effect as identified in the Final EIR. Brief Explanation of the Rationale for the Finding CEQA requires that all feasible and reasonable mitigation be applied to the project to reduce the impacts from ozone precursor emissions(NOx,VOC)on air quality. Implementation of Mitigation Measures 4.1- 1, 4.1-2, 4.1-3,4.1-4, and 4.1-5 and 4.1-7 would reduce the emissions of criteria pollutants(NOx,VOC). No other reasonable or feasible mitigation has been identified that will reduce impacts to air quality for the project. Potential Significant Effect The project could have significant cumulative impacts on air quality from fugitive dust particulate matter emissions. Description of Specific Impact Travel on unpaved surfaces, such as haul roads typically account for about 80% of the fugitive PMIo emissions. Emissions from other activities such as aggregate handling(loading and unloading of trucks) and wind erosion of storage piles and open surfaces, contribute the remainder of the fugitive dust emissions. The unmitigated mining project fugitive dust particulate matter emissions of PMIo are 147.47 tpy, and the unmitigated emissions of PM2.5 are 27.25 tpy. The unmitigated San Joaquin Composting Lost Hills Facility project fugitive dust particulate matter emissions of PMIo are 4.6405 tpy, and the unmitigated emissions of PM2.5 are 4.5935 tpy. The unmitigated Kern County Lost Hills Sanitary Landfill project fugitive dust particulate matter emissions of PMIo are 84.90 tpy, and the unmitigated emissions of PM2.5 are 25.27 tpy. The total cumulative fugitive dust particulate matter emissions from existing and proposed projects in the planning area are summarized below. Note that the contribution of the H. M.Holloway landfill activities emissions represents the total emissions that would occur, as opposed to the incremental increase from the baseline. Note that two sets of emissions are provided; one for the near term period until 2027; and one for the long term period 2027 and beyond. The near term unmitigated fugitive dust particulate matter emissions of PMIo are 297.3381 tpy, and the near term unmitigated emissions of PM2.5 are 56.5011 tpy. The long term unmitigated fugitive dust particulate matter emissions of PMIo are 382.2381 tpy, and the long term unmitigated emissions of PM2.5 are 81.7711 tpy. Cumulative emissions, both near term, and long term, of I'M 10 will continue to exceed specified significance threshold levels of fifteen tons per year from projects located within the designated planning area. The resulting reductions in particulate matter emissions from Mitigation Measure 4.1-6 are provided below as the net emissions increase. Wet suppression of unpaved road dust in conjunction with other types of dust control measures required SJVAPCD Regulation - VIII is expected to reduce fugitive dust emission by about 50% (per URBEMIS 2002 assumptions). The near term mitigated fugitive dust particulate matter emissions of PMIo are 233.0881 tpy, and the near term mitigated emissions of PM2.5 are 45.6561 tpy. The long term mitigated fugitive dust particulate matter emissions of PMIo are 317.9881 tpy, and the long term mitigated emissions of PM2.5 are 71.9211 tpy. Nevertheless, the cumulative fugitive dust air quality impacts of PMIo emissions will remain significant and unavoidable. ................... -----._.. -- .._..-.....---- - ...__.__.....-- Findings of Fact—Section 15091 March 15,2016 H. M. Holloway Landfill Modification Project Final Board of Supervisors 16