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<br /> <br /> <br />Memorandum <br />March 25, 2025 <br />Page 15 <br />21202-23 North County Landfill_AQ_0307 <br />The estimated health risks at the MEIR due to DPM emissions from project operation are <br />summarized and compared to the Valley Air District’s thresholds of significance in Table 4. The <br />estimated cancer risk and chronic HI for DPM at the MEIR were below the Valley Air District’s <br />thresholds. Therefore, the project would not expose sensitive receptors to substantial pollutant <br />concentrations. The impact would be less than significant. <br />Table 4. Health Risks during Project Operation <br />Emissions Scenario Receptor <br />Diesel Particulate Matter <br />Cancer Risk <br />(per million) <br />Chronic <br />Hazard Index <br />Baseline Condition Haul Route <br />MEIR <br />0.8 <0.01 <br />Project Condition 1.5 <0.01 <br />Net Difference 0.7 <0.01 <br />Thresholds of Significance 10 1.0 <br />Exceed Threshold? No No <br />Source: Attachment C. <br />Exposure to Carbon Monoxide Emissions <br />The source of local carbon monoxide concentrations is often associated with heavy traffic <br />congestion at nearby intersections. According to the Transportation Impact Analysis for the <br />project,10 the project would generate 461 trips per day in average. The studied intersections <br />and road segments would operate acceptably at LOS C or better under existing and future <br />volumes without or with the addition of project-generated trips. Since the project would not <br />reduce LOS on streets or intersections in the project vicinity to LOS E or F, the project does not <br />meet the Valley Air District’s screening level for potentially significant carbon monoxide <br />impacts. Therefore, the project would not result in a net increase in the potential exposure of <br />existing sensitive receptors to carbon monoxide concentrations from project-generated traffic <br />and this impact would be less than significant. <br />Odor <br />Landfills have the potential to produce odors that could adversely affect area receptors. Odors <br />are generated at the landfill working face due to tipping and dumping putrescible waste. The <br />main method for controlling odor at the landfill working face is by applying cover material. In <br />addition, fugitive LFG that escape through the LFG collection and control system can contribute <br />to odors. According to the applicant, no complaints have been received for the North County <br />Landfill over the past three years. Since the project would not change the odor control method <br /> <br />10 W-Trans, 2025. Draft Transportation Impact Analysis for the North County Recycling Center and Sanitary Landfill <br />Project. January 23.