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2,000 TPD Case(Offroad Equipment) Exhaust emissions from offroad disposal equipment are unaffected by the type of material disposed of but are directly proportional to waste disposal rates. This is due to the fact that the proposed Project's operations will not significantly differ from those of the historical disposal operations. It is expected that similar waste stream handling and disposal operations will continue with the proposed Project. Consequently, for the 2,000 tpd disposal case, exhaust emissions from offroad mobile source equipment were calculated by prorating exhaust emissions that occur from equipment at the baseline disposal rate of 425 tpd. Baseline emissions were prorated using a factor equal to 4.7026(or 2,000 tpd/425.3 tpd). Baseline Case(Offroad Equipment) Exhaust emissions from nonroad (offroad) equipment were calculated from engine horsepower, and operating hours for EPA/CARB "Tier-0"(i.e. uncontrolled)nonroad engine factors. 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. Mitigation will be provided for ozone precursor emissions of NOx and VOC. Exhaust emissions from offroad mobile source equipment jointly used for mining and disposal activities will be reduced by replacing existing jointly used EPA/CARB Tier-0 engines with new engines meeting EPA/CARB Tier-11 emission standards. These engine retrofits were selected based on the historical baseline offroad equipment use hours that were dedicated to joint use. The new engines will significantly reduce exhaust emissions. Reduction in these emissions will help mitigate emission increases caused by the Project. 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 the following mitigation measure will reduce the potential impact of this significant effect to a less than significant level: MM 4.1-1. Twelve EPA/CARB Tier-0 diesel engines used in existing shared of-road equipment for adjacent mining operations and disposal operations shall be replaced with new less polluting EPA/CARB certified Tier-II engines. Written evidence of completion shall be submitted to the Kern County Planning Department. Potential Significant Effect Without proper mitigation, the project has the potential to significantly impact air quality through violations of Air Quality Standards or by contributing substantially to existing or projected air quality violations. Description of Specific Impact Increases in ambient concentrations were predicted using the refined model AERMOD with regulatory default options. The air modeling analysis was conducted using one year of surface meteorological data obtained from the National Weather Service(NWS) Station at Bakersfield Meadows Field Airport,for the ------ -- -------- .._..-............_..._....._...... _ _-- -..._._._.._............ --- - .....- - - -.._........__..-..... - -- —--- _ - - Findings of Fact—Section 15091 March 15,2016 H.M. Holloway Landfill Modification Project Final Board of Supervisors 3