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MOUNTAIN HOUSE PROPOSED ALTAMONT HEIGHTS TENTATIVE MAP 4. ENviRONMENTAL CHECKLIST 4.3 AIR QUALITY refuse piles are removed. The Altamont Heights project site is over one mile west of the F1abandoned dairies at Mountain House Parkway and Grant Line Road. Development of the proposed project would involve demolition or renovation of existing ri buildings that may contain asbestos. Therefore, the proposed project could contribute to the conditions that make Impact 4.12-2 significant and unavoidable. FIL Development of the proposed project would result in increases in long-term regional emissions, primarily associated with automobile traffic. Therefore, the proposed project Pwould contribute to the conditions that make Impact 4.1.2-5 significant and unavoidable. t t DISCUSSION REGARDING PROPOSED PROJECT a) Conflict with or obstruct implementation of the applicable air quality plan? and b) Violate any air quality standard or contribute substantially to an existing or projected air quality violation? and c) Result in a cumulatively considerable net increase of any criteria pollutant for which the project region is non-attainment under an applicable federal or state ambient air quality standard(including releasing emissions which exceed quantitative thresholds for ozone precursors)? Development of Specific Plan III,of which the proposed project is a part,would generate construction,motor vehicle, and other air emissions (from fireplaces,barbecues, etc). The MEIR calculated the potential air quality impacts associated with these emissions as part of the greater MHMP development and concluded that a significant unavoidable impact would occur(i.e.,conflict with or obstruct implementation of the S3VAPCD Air Quality Attainment Plan) even with implementation of the mitigation measures identified in the MSIR. -F, Development of Specific Plan III could potentially conflict with the Air Quality Attainment Plan,violate air quality standards,contribute substantially to an air quality violation, and/or result in a cumulatively considerable net increase of criteria pollutants for which the region is in non-attainment(EDAW, 2005b). Computer model results resented in the SPIREIR revealed that development of Specific p p Plan III would result in long-term regional emission of approximately 58 tons per year of reactive organic gas(a precursor to the formation of ozone), 38 tons per year of the oxides of nitrogen (principally nitrogen dioxide),and 112 tons per year of PMIo. SJVAPCD's recommended significance threshold for each of these emissions is 10 tons per year. t Therefore, development of Specific Plan III may contribute to concentrations that exceed applicable standards because of current non-attainment conditions (EDAW, 2005b). The resulting impacts would be significant and unavoidable. 4-14