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4. ENVIRONMENTAL ANALYSIS 4.6 AIR QUAt.TTY -- Mitigation Measure 4.6.2: Project Operational-Phase Emissions Impact _ While several emission reducing measures are currently available,the extent that quantification of these reductions can be conducted at this time is uncertain. These operational impacts are a significant and unavoidable impact of the Proposed Project. The Proposed Project proposes to operate using new equipment,both on-site nonroad equipment and haul trucks. This provides the best available operating efficiency for this equipment. Currently,additional retrofits would be cost prohibitive to reduce NOx emissions below acceptable emission standards. Particulate Filters and catalysts and the use of ultra low sulfur fuels does not greatly reduce NOx emissions. Significance after Mitigation: Mitigation measures for NOx impacts are not be feasible and/or technically possible,thus impacts are significant and unavoidable. Impact 4.63: Project Odor Impact Though offensive odors from stationary sources rarely cause any physical harm,they still-remain unpleasant and can lead to public distress generating citizen complaints to local governments. The occurrence and severity of odor impacts depend on the nature,frequency and intensity of the source; wind speed and direction; and the sensitivity of receptors. The CEQA Guidelines,as amended recommend that odor impacts be considered for any proposed new odor sources located near existing receptors,as well as any new sensitive receptors located near existing odor sources. Generally, increasing the distance between the receptor and the source will mitigate odor impacts. The SJVAPCD has determined some comment types of facilities that have been known to produce odors. For an asphalt batch plant,this distance is one mile. The Proposed Project will locate the asphalt batch plant at a distance greater than one mile to the nearest sensitive receptor. Therefore,the impact of odors from the project would be less-than-significant. Mitigation Measure: No mitigation required. Impact 4.6A: Project DPM Impact of On-site Equipment. Implementation of the Proposed Project may lead to increases in chronic exposure of nearby sensitive receptors to certain toxic air contaminants from various stationary and mobile sources. This impact is significant and unavoidable. — TAC emissions would be released from the asphalt batch plant, on-site equipment, and haul trucks associated with the Proposed Project. The CARB has declared that DPM from diesel — engine exhaust is a TAC. Additionally,the California Office of Environmental Health Hazard Assessment(OEHHA)has determined that chronic exposure to DPM can cause carcinogenic and RMC Facfic vemaGs Quarry Mining aad Re Il fim Project 4.6-24 FSA/203015 Admiois we Draft Eat M=h 2004