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San Joaquin County Community Environmental Setting,Impacts,and Mitigation Measures Development Department Air Quality diesel powered equipment(i.e., equipment used in quarry excavation, haul trucks, stationary equipment). At a minimum,the project applicant shall ensure that particulate filters are installed in all off-road diesel powered equipment. Appendix L contains control technology that may be implemented to control emissions from diesel-powered equipment. Impact AIR-5: Generation Elevated Emissions of Particulate Matter (Less Than Significant) As indicated in Table 3.0-5,the proposed Project would generate emissions of PM10 between 31 and 38 tons per year. The proposed plant facility would be required to comply with existing the SJVAPCD regulations,including Regulation VIll and stationary source permitting requirements. However,the SJVAPCD has not established significance thresholds for PM10. In addition,the Applicant has committed to the installation of a baghouse system that would minimize emissions of fugitive dust,as well as the use of water and seeding topsoil storage berms with a mixture of grass seed and/or mulch to minimize erosion. Consequently,the project's fugitive dust emissions will be tightly controlled and are considered to be less than significant. Impact AIR-6: Exposure of Sensitive Receptors to an Increased Health Risk from Exposure to Diesel Exhaust from Facility Operations (Less than Significant) Even though fugitive dust emissions would be tightly controlled,the Project would generate exhaust emissions of diesel particulates from the operation of off- and on-road diesel equipment. These emissions have been evaluated to determine their potential health risk. To estimate potential health risks associated �. with operation of these equipment pieces,a health risk analysis was conducted using the EPA's ISCST model. The modeling results indicated that the project would result in a health risk in excess of 6 cases of cancer per million at the nearest sensitive receptor located near the project entrance and at the migrant housing along the proposed project's western boundary along the Delta-Mendota Canal for year 2007 conditions. For 2037 conditions,the health risk be less than .. one case of cancer per million due to decreases in equipment emission rates associated with improved equipment technology and regulatory requirement. Modeling indicates that the predominant source of emissions contributing to the cancer risks is equipment used in overburden removal/mining activities located in the pits. These cases of cancer are below the SJVAPCD's significance threshold of 10 in one million. Implementation of Mitigation Measures AIR-4a and AIR- 4b above would help to reduce emissions of DPM further. Because cancer risks -� are not anticipated to exceed the SJVAPCD's significance threshold of 10 in one million, this impact is considered less than significant. DeSilva Gates Quarry Project Draft Environmental Impact Report 3.0-17 JSS 05105.05