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_ San Joaquin County Community Alternatives Analysis Development Department concrete plant,recycling plant and aggregate handling and storage piles,would also not occur. Implementation of Mitigation Measure AIR-4a: Restrict Idling of On-Road Diesel Trucks and Mitigation Measure AIR41b: Implement Emissions Control Technology would reduce this impact. However,total emissions of ROG and NOx associated with excavation of the quarry and hauling of materials would still be in excess of SJVAPCD thresholds. This impact on air quality would remain significant and unavoidable. Diesel exposure from vehicles accessing the facility and operation of on-site ` diesel equipment can create an elevated cancer risk. However, assuming the closest sensitive receptor would be located more than 300 feet from the access points and operation areas for such vehicles under this alternative,the cancer risk �- would be below threshold levels and this impact on air quality could be mitigated to a less-than-significant level. Transportation and Traffic The number of truck trips from the project site would remain the same as the proposed Project as trucks would be used to haul unprocessed excavated material off site to the processing plant. Recyclable material would be brought directly to i the existing off-site plant,reducing inbound truck trips at the project site,but increasing truck trips to the off-site facility. This alternative would require additional miles of truck travel to deliver unprocessed material to the off-site processing plant and then deliver processed material to the final user. This has the potential to cause significant impacts attributable to changes in LOS and increased structural roadway damage on routes required to access the off-site facility. In addition,the changes in LOS on segments of SR 132 and structural damage that potentially would occur under the proposed action also would occur under this alternative. Mitigation to reduce the ` structural roadway damage to less-than-significant levels would be similar to mitigation proposed for the proposed Project. However,as described in section 3.L, "Transportation and Traffic,"no mitigation is available to reduce impacts of changes in LOS on SR 132. This impact on transportation would be significant and unavoidable. Mitigated Design Alternative The impacts of this alternative would be similar to the proposed Project for all resource areas except aesthetics, air quality,noise, and transportation and traffic, which are discussed below. r. DeSilva Gates Quarry Project Draft Environmental Impact Report 4-5 J85 05105.05