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The proposed project would include the development of a mix of land uses. However,the proposed project would not include new agricultural,dairy,heavy industrial,or manufacturing uses that often are the sources of objectionable odors. Therefore,a less-than-significant impact would occur. The project site contains two dairies. These dairies are located in the eastern portion of the site along Mountain House Parkway(see Figure 4.2-1 in Section 4.2,"Land Use and Agriculture'l,and contain dairy cows,feet lots, waste ponds,and animal refuse piles. The dairies,especially the waste ponds and animal refuse piles, generate objectionable odors. Under the proposed project,new residential land uses would be developed directly west of these existing dairies(see Figure 3-6B in Chapter 3,"Project Description"). This would occur in Phase I(2005- 2008). Therefore,the new residences proposed adjacent to the dairies would be subject to objectionable odors from the dairies on an occasional basis,when west-to-east winds are weak or non-existent,and on a temporary basis until the dairies are replaced with urban development scheduled for Phase III(2012-2015)of the proposed project. A significant impact could occur. ` Mitigation Measure 4.12-3: Air Quality—Possible Temporary and Occasional Exposure of New Sensitive Uses to Odors ` The College Park developers shall not develop any new residential uses within 1,000 feet of the two existing on- site dairies until such time as the diaries cease operation and the dairy waste ponds and animal refuse piles are removed. Implementation of the above mitigation measure would reduce temporary and occasional odor impacts associated with developing new residential uses adjacent to the existing dairies to a less-than-significant level. IMPACT Air Quality--Generation of Local Mobile-Source CO Concentrations. Implementation of the proposed 4.12-4 project would result in the generation of CO at nearby intersections from increased vehicular traffic on the local transportation network. However, the proposed project would not contribute to CO concentrations that exceed the CAAQSs of 9.0 ppm for 8 hours or 20 ppm for 1 hour at these intersections during or at buildout (2025). A less-than-significant impact would occur. The primary mobile-source pollutant of localized concern is CO. Local mobile-source CO emissions near roadway intersections are a direct function of traffic volume, speed,and delay. Transport of CO is extremely limited because it disperses rapidly with distance from the source under normal meteorological conditions. Under specific meteorological conditions,CO concentrations near roadways and/or intersections may reach unhealthy levels with respect to local sensitive land uses, such as residential units,hospitals, schools, and childcare facilities. Modeling of CO concentrations is typically recommended for areas located near signalized roadway intersections that are projected to operate at an unacceptable LOS (i.e.,LOS E or F) (Garza et al. 1997). As indicated in Section 3.12,"Project Phasing,"the phasing plan for the proposed project calls for buildout of the project in year 2025. According to the traffic analysis prepared for the proposed project(Section 4.11, "Transportation'),traffic on the roadway network in 2025 resulting from buildout of the proposed College Park project in combination with areawide growth would not result in LOS E or F conditions at any of the intersections analyzed. Therefore,modeling of CO concentrations for the year 2025 is not necessary. With continued reductions in CO emissions from mobile sources,which is anticipated because of expected technological improvements and regulatory controls,predicted CO concentrations in the year 2025 associated with project traffic would not be anticipated to exceed the NAAQSs/CAAQSs for CO at area intersections. A less-than- a significant impact would occur. Mitigation Measure 4.12-4: Air Quality—Generation of Local Mobile-Source CO Concentrations No mitigation is required. College Park at Mountain House Specific Plan III Draft EIR EDAW San Joaquin County 4.12-23 Air Quality