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4.12.4 IMPACT ANALYSIS ANALYSIS METHODOLOGY The evaluation of short-term construction emission of criteria air pollutants is based on whether appropriate, feasible construction control measures are incorporated into the project. Increases in TACs are qualitatively discussed because specific development proposals regarding the types of land uses that could generate TACs (limited industrial and commercial uses)will not be known until a later stage of planning. Potential odor nuisances are evaluated based on existing odor sources, a review of records of any complaints, and the proximity of proposed sensitive uses to existing odor sources. Local mobile-source CO concentrations are modeled at signalized roadway intersections that are projected to operate at an unacceptable LOS by the traffic analysis using the CALINE4 model as recommended by the SJVAPCD. Long-term increases in regional emission of criteria pollutants are quantified using the ARB-approved URBEMIS2002 computer program. IMPACTS AND MITIGATION MEASURES IMPACT Air Quality—Potential Generation of Temporary,Short-Term Construction Emissions of Criteria Air 4.12.1 Pollutants. Construction activity under the proposed project would generate temporary emissions of criteria pollutants that could interfere with the attainment of ambient air quality standards,and would generate fugitive dust that could adversely affect adjacent agricultural crops.Although the MHMP requires compliance with SJVAPCD control measures designed to mitigate construction emission impacts of new development it does not identify the specific control measures or guarantee that the latest version of the control measures would be implemented. A significant impact could occur. The proposed project would be developed in four phases over 20 years; construction would begin in 2005 and end in — 2025. Construction-generated emissions are short-term and of temporary duration,lasting only as long as construction activities occur,but possess the potential to represent a significant air quality impact. The construction and development of residential,commercial,industrial,and public uses on the 815-acre project site would result in _ the temporary generation of NOx,ROG,and PMrp emissions resulting from site grading and excavation,road paving,the application of architectural coatings,motor vehicle exhaust associated with construction equipment and worker trips,and the movement of construction equipment,especially on unpaved surfaces. The SJVAPCD _ emphasizes implementation of effective and comprehensive control measures,rather than requiring a detailed quantification of construction emissions. The SJVAPCD Guide for Assessing and Mitigating Air Quality Impacts requires that all feasible control measures,which are dependent on the size of the construction area and the nature of the construction operations involved,be incorporated and implemented,and considers projects where these measures are implemented to have a less-than-significant construction-emissions impact. Section 10.5(a)of the MIIMP requires that construction practices comply with the control measures of the SJVAPCD,but does not identify the specific control measures or recognize that these control measures are periodically revised by the SJVAPCD. Therefore,a significant impact could occur. Emission of fugitive dust generated during construction of the proposed project could result in the transmission of _ dust to nearby agricultural crops. The accumulation of dust on the leaves of nearby agricultural plants could potentially result in reduced crop yields resulting from decreased rates of plant photosynthesis. In addition, repeated or long-term accumulation of dust on the leaves of plants could encourage the development or increased _ activity of spider mites. A report entitled Evaluation of Potential Effects of the Carmel River Dam and Reservoir Project on Cachagua Valley Vineyards(Ballanti&Kasimatis 1997),prepared for the Monterey Peninsula Water Management District analyzed dust impacts to vineyards. The report found that increased spider mite activity is _ most noticeable within approximately 100 feet downwind of dust-generating activities. Because the proposed project would implement the dust-suppression measures required by SJVAPCD as required by Section 10.5A of the MI-IMP,the generation of fugitive dust that could adversely affect adjacent crops would be limited. Therefore, a less-than-significant impact would occur. EDAW College Park at Mountain House Specific Plan III Draft EIR — Air Quality 4.12-20 San Joaquin County