SU0004098 - Laserfiche WebLink

Home Browse Search

San Joaquin County Community Alternatives Analysis Development Department Aesthetics Under this alternative,a temporary plant would be used while initial mining is — completed in the South Pit,then the permanent plant would be constructed on backfilled area within the pit,probably below grade,reducing visibility of the plant site. Once the permanent plan is constructed within the pit,views from the ground level of plant operations would be substantially reduced. The impact would be less than significant. Air Quality Under this alternative,the processing equipment(crushing and washing), stockpiling,and material production(asphalt and concrete)operations would be located at the southern end of the site. This reconfiguration would lessen the _ distance that equipment and truck would have to travel on site, and would also prevent haul trucks from traveling next to the residence near the eastern border of the property along Koster Road. _ Table 4-1 summarizes emissions associated with operation of the new mitigated design alternative. As indicated in Table 4-1,the primary source contribution to this impact is mobile source emissions from heavy equipment and haul trucks, which are not subject to stationary source permitting rules. This impact is considered significant. Implementation of the Mitigation Measures AIR-4a, Restrict Idling of On-Road Diesel Trucks,and AIR-4b,Implement Emissions Control Technology,will reduce this impact,but not to a less-than-significant level. Consequently,this impact is considered significant and unavoidable. A health risk assessment associated with operation of the mitigated design alternative 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. Modeling indicates that the T predominant source of emissions contributing to the cancer risks is equipment used in overburden removal/mining activities.These cases of cancer are below the SJVAPCD's significance threshold of 10 in one million. Implementation of Mitigation Measures AIR-4a, Restrict Idling of On-Road Diesel Trucks,and AIR-4b,Implement Emissions Control Technology, 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. Noise Relocating the processing equipment operations to the southern end of the site — would increase the distance between aggregate processing equipment and DeSilva Gates Quarry Project Draft Environmental Impact Report 4-6 AS 05105.05