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E. Cumulative Environmental Effects Of The Proposed Project That Will Have A Significant Impact On The Environment. Potential Significant Effect The project could have significant cumulative impacts from cumulative ozone precursor emissions(NOx, VOC). Description of Specific Impact The majority of the ozone precursor emissions from the Lost Hills Golden Gyp Mine result from activities that are similar to activities conducted for waste disposal operations. Offroad equipment such as rippers, dozers and scrapers are used for extracting minerals. Diesel trucks are used for onroad transport of gypsum. The unmitigated mining project exhaust emissions of NOx are 58.96 tpy, and the unmitigated emissions of VOC are 3.58 tpy. Ozone precursor emissions from San Joaquin Composting, Lost Hills Facility were calculated using source test information and other data obtained from a variety of sources, such as the SJVAPCD and the Kern County Environmental Health Services Department. The unmitigated composting project emissions of NOx are 144.95 tpy, and the unmitigated emissions of VOC are 572.56 tpy. By the year 2027,the adjacent H. M. Holloway Landfill will be in closure. Thus, the Lost Hills Sanitary Landfill will be opening after the closure of the H. M. Holloway Landfill facility. Annual average estimated unmitigated project emissions from the Kern County Lost Hills Sanitary Landfill project included in the cumulative impact analysis are 34.18 tpy for NOx, and 27.53 tpy for VOC. Summary of Total Unmitigated Ozone Precursors The total cumulative ozone precursor 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 emissions of the Kern County Lost Hills Sanitary Landfill are included in the long term impacts below. The near term unmitigated ozone precursor emissions of NOx are 293.32 tpy, and the near term unmitigated emissions of VOC are 134.74 tpy. The long term unmitigated ozone precursor emissions of NOx are 327.50 tpy, and the long term unmitigated emissions of VOC are 162.27 tpy. Cumulative emissions, both near term, and long term, of NOx and VOC will continue to exceed specified significance threshold levels of ten tons per year from projects located within the designated planning area. The emission reductions from Mitigation Measure 4.1-2 summarized below will mitigate ozone precursor emissions of NOx and VOC. The near term mitigated ozone precursor emissions of NOx are 267.06 tpy, and the near term mitigated emissions of VOC are 132.05 tpy. The long term mitigated ozone precursor emissions of NOx are 301.24 tpy, and the long term mitigated emissions of VOC are 159.58 tpy. The cumulative ozone precursors emissions air quality impact remains significant and unavoidable. Finding The cumulative air quality impact from ozone precursor emissions (NOx, VOC) is considered significant and unavoidable. All feasible and reasonable changes or alterations have been required in, or -------------------. -- -- __ .---- ---- -- Findings of Fact—Section 15091 March 15,2016 H. M.Holloway Landfill Modification Project Final Board of-Supervisors 15