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Mitigation Measure 4.12-1: Air Quallty—Potential Generation of Temporary,Short-Term Construction Emissions of Criteria Air Pollutants The College Park developers shall implement the latest version of the SJVAPCD construction-emissions control measures during construction(see"Regulatory Setting,"above).' Implementation of the above mitigation measure would reduce temporary, short-term impacts associated with fugitive dust and other criteria air pollutants generated by construction activity to a less-than-significant level. IMPACT Air Quality—Potential Generation of Toxic Air Contaminants. The proposed project could include the 4.12-2 demolition or renovation of existing structures that contain asbestos, resulting in an exposure hazard from the airborne entrainment of asbestos. In addition, the proposed project could include the use of diesel-fueled vehicles that could result in the generation of diesel PM emissions that exceed SJVAPCD significance thresholds. A significant and unavoidable impact could occur. The demolition or renovation of existing structures at the project site under the proposed project could result in the airborne entrainment of asbestos resulting from the disturbance of asbestos-containing materials,if such materials are present. Asbestos is listed as a TAC by ARB and as a HAP by EPA. The risk of disease depends on + the intensity and duration of exposure. Asbestos fibers when inhaled may remain in the lungs and are linked to such diseases as asbestosis,lung cancer,and mesothelioma(ARB 2001). The potential impact of the demolition of existing structures that contain asbestos materials is evaluated further in the Section 4.9,"Public Health and Safety" A significant impact could occur. The proposed project could include new research and development and manufacturing facilities that utilize TACs. These could be located in the vicinity of existing and proposed sensitive uses(e.g.,residences, schools, child care facilities,places of worship, hospitals). Pursuant to SJVAPCD Rule 2010,all sources having the potential to emit TACs are required to obtain permits from SJVAPCD. Permits may be granted to these operations if they are constructed and operated in accordance with applicable regulations,including Rule 2201 (New and Modified Stationary Source Review Rule),Rule 4001 (New Source Performance Standards),and Rule 4002(National Emissions Standards for Hazardous Air Pollutants). Given that compliance with applicable standards is required for the development and operation of facilities that may emit TACs,the TAC emissions that could potentially be emitted under the proposed project would be within established standards.Therefore, a less-than-significant impact would occur. Although TAC emission from individual stationary sources would be less than significant,Rules 2201,4001,and 4002 are not applicable to TAC emissions from mobile sources. Particulate exhaust emissions from diesel-fueled engines(diesel PM)were identified as a TAC by the ARB in 1998. Implementation of the proposed project would result in the generation of diesel PM emissions during construction from the use of off-road diesel equipment for site grading and excavation,paving, demolition,and other construction activities,and during project operation from heavy-duty trucks used in commercial and industrial areas(e.g.,delivery trucks). Diesel PM from construction projects typically is generated in a single area for a short period. Although construction associated with the College Park site would occur over an extended period(20 years), activities would be spread over a large area. Use of diesel-powered construction equipment in any one area would be temporary and s episodic and would cease when construction is completed in that area. In addition,the project site is located within an area with strong prevailing winds,thus allowing for constant mixing of air masses. For these reasons, diesel PM generated by project construction, in and of itself,would not be expected to create conditions where the probability is greater than 10 in 1 million of contracting cancer for the Maximally Exposed Individual,or generate ' The latest version of SJVAPCD control measures are included in the Guide for Assessing and Mitigating Air Quality Impacts (SJVAPCD 1998)and repeated in the"Regulatory Setting"subsection. The SJVAPCD periodically revises its control measures. Development under College Park would be required by SJVAPCD to implement the current version of the measures at the time individual development applications are received by the County for development under College Park College Park at Mountain House Specific Plan III Draft EIR EDAW San Joaquin County 4.12-21 Air Quality