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The project will not significantly impact air quality due to fugitive particulate matter emissions from onroad transport of material. The project will not significantly impact air quality due to particulate matter emissions from employee commute and business travel. The project will not significantly impact air quality from emissions of carbon monoxide during project operation. The project will not create localized carbon monoxide hot spots that may expose sensitive receptors to substantial pollutant concentrations. The project will not significantly impact air quality from emissions of sulfur'dioxide during project operation. The project will not significantly impact visibility in military flight corridors or in Class I Areas within 100 km of the project site. The project will not create significant impacts related to Valley Fever(Coccodiomycosis)exposure. The project will not expose sensitive receptors to health risks from substantial pollutant concentrations. B. Environmental Effects Of The Project That Are Potentially Significant,But That Can Be Mitigated To A Less Than Significant Level. Potential Significant Effect Without proper mitigation, the project has the potential to impact air quality due to emissions of ozone precursors(NOx,_VOC)from project operation of offroad mobile source equipment. Description of Specific Impact Exhaust Emissions from Offroad Equipment Landfilling disposal activities require the use of construction equipment such as scrapers and bulldozers that are powered by nonroad diesel engines. Nonroad (or offroad) diesel engine emissions were calculated from engine horsepower, engine operating hours dedicated to waste disposal and EPA/CARB emission factors for nonroad(or offroad)diesel fueled engines. Findings of Fact—Section 15091 March 15,2016 H.M. Holloway Landfill Modification Project Final Board of Supervisors 2