COMPLIANCE INFO_FINAL INITIAL STUDY/MITIGATED NEGATIVE DECLARATION 5/25

Home Browse Search

North County Recycling Center and Sanitary Landfill Permit Revision Project Final Initial Study/Mitigated Negative Declaration · San Joaquin County | May 2025 25 The estimated health risks at the MEIR due to DPM emissions from project operation are summarized and compared to the Valley Air District’s thresholds of significance in Table 4. The estimated cancer risk and chronic hazard index for DPM at the MEIR were below the Valley Air District’s thresholds of significance. Therefore, the project would not expose sensitive receptors to substantial pollutant concentrations. The impact would be less than significant. Table 4. Health Risks During Project Operation EMISSIONS SCENARIO RECEPTOR DIESEL PARTICULATE MATTER Cancer Risk (per million) Chronic Hazard Index Baseline Condition Haul Route MEIR 0.8 <0.01 Project Condition 1.5 <0.01 Net Difference 0.7 <0.01 Thresholds of Significance 10 1.0 Exceed Threshold? No No Source: Appendix A, Attachment C Exposure to Carbon Monoxide Emissions Heavy traffic congestion at intersections can be local hotspots of carbon monoxide emissions. Although the project would increase truck trips associated with operation of the landfill, as discussed in Section 4.2.17, Transportation, the project would not cause any intersection to operate at LOS E or F. Therefore, the project would not conflict with the Valley Air District’s thresholds of significance related to carbon monoxide hotspots, nor would it result in a net increase in the potential exposure of existing sensitive receptors to carbon monoxide concentrations from project-generated truck trips. The impact would be less than significant. d) Result in other emissions (such as those leading to odors) adversely affecting a substantial number of people? Less-than-Significant Impact Landfills are known to produce odors that could adversely affect area receptors. Odors are currently generated at the landfill working face due to tipping and dumping putrescible waste. The main method for controlling odor at the landfill working face is by applying cover material. In addition, fugitive LFG that escape through the LFG collection and control system can contribute to odors. As explained in the Methodology section above, the Valley Air District has identified that a project would have a significant impact related to odors if it would generate more than one confirmed complaint per year averaged over a three-year period, or three or more unconfirmed complaints per year averaged over a three-year period. According to the applicant, no complaints have been received for the North County Landfill over the past three years. Since the project would not change the odor control method or the LFG collection and control system, the increase in maximum allowed daily refuse disposal is not expected to substantially increase odor generation. Therefore, the project’s odor impact would be less than significant.