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year 2004. Upper air station data was obtained from the NWS Station at Oakland, California. The meteorological data used in the modeling was provided by the SNAPCD. Modeling runs were conducted using the EPA recommended regulatory default parameters. The air quality impact analyses assumptions utilized the same operational methods described in the Draft EIR for waste streams handling and processing. Emission increases were calculated using a baseline disposal rate of approximately 425 tpd versus the proposed disposal rate of 2,000 tpd. Air quality impacts for criteria pollutant emissions of particulate matter(PMIo)and fine particulate matter (PM2.5) were assessed by adding the modeled increase in ambient concentrations to background concentrations reported by the Bakersfield Golden State Highway Air Monitoring Station(PMIo,PM2.5). PMIo-Ambient Air Ouality Impacts The extent of the impact was characterized by comparing the net increase (the mitigated emissions) in ambient PMIo concentrations predicted to occur at Lost Hills (the sensitive receptor location approximately 4 miles away that had the maximum impact)to the PMIo baseline concentration determined to be representative for the PMIo concentration in the vicinity of the Project. The baseline concentration used in the analysis was obtained from the Bakersfield, Golden State Avenue Air Monitoring Station(the Shafter Station does not monitor PMIo). The Project level effects of PMIo emissions will not violate or contribute significantly to existing or projected air quality violations. The Project level PMIo operational emissions will not exceed NAAQS 24-Hour PMIo standards at the sensitive receptor location that had the maximum impact. PM2.s-Ambient Air Ouality Impacts The extent of the impact from PM2.5 emissions was assessed by comparing the net increase(the mitigated emissions) in the ambient PM2.5 concentrations predicted to occur at Lost Hills (the sensitive receptor location approximately 4 miles away that had the maximum impact) to the PM2.5 baseline concentration determined to be representative for the PM2.5 concentration in the vicinity of the Project. The Shafter Station does not monitor for PM2.5. Consequently,the background concentration used in the analysis was obtained from the Bakersfield, Golden State Avenue Air Monitoring Station. During 2004 and 2005 baseline monitoring showed that the area exceeded the NAAQS 24-Hour PM2.5 standard in the absence of the Project. If the proposed Project had existed in 2004 and 2005, then it would not have significantly contributed to the exceedance. During 2006, baseline monitoring showed the area to be in compliance with the NAAQS 24-Hour PM2.5 standard and modeling has shown that the Project emissions will not cause or contribute to an exceedance of the standard in 2006 and future years. 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 Findings of Fact—Section 15091 March 15,2016 H.M.Holloway Landfill Modification Project Final Board of Supervisors 4