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ground-level concentrations of non-carcinogenic toxic air contaminants that exceed a Hazard Index greater than 1 for the Maximally Exposed Individual. A less-than-significant impact would occur. Operational activities that require the use of diesel-fueled vehicles for extended periods, such as commercial trucking facilities or delivery/distribution areas,may generate diesel PM emissions that could exceed the SJVAPCD's significance thresholds. Although the specific commercial and industrial uses to be developed under College Park would be identified at a later stage of planning,the College Park project would permit commercial uses that would require large delivery and shipping trucks that use diesel fuel. The diesel PM emissions generated by these uses would be generated primarily at single locations on a regular basis. Idling trucks,including transport refrigeration units,would increase diesel PM levels at these locations. Diesel PM emissions could be blown to nearby sensitive receptors. This impact is considered significant because it is unknown whether the concentration of diesel PM at any sensitive receptor locations might exceed the threshold for acceptable cancer risk for the Maximally Exposed Individual. It is also unclear what effect the ARB's new diesel engine emission standards and diesel PM regulations would have on the level of emissions from any one facility. Moreover,the combined effects of TACs from all stationary sources developed under the proposed project,in addition to mobile sources of TACs, are unknown and could exceed the threshold for acceptable cancer risk for the Maximally — Exposed Individual. A significant and unavoidable impact could occur. Mitigation Measure 4.12-2: Air Quality—Potential Generation of Toxic Air Contaminants Asbestos The College Park developers shall implement Mitigation Measure 4.9-1. Implementation of the above mitigation measure would reduce potential TAC impacts associated with asbestos to a less-than-significant level. Mobile-Source TAC Emissions The College Park for industrial or commercial land uses shall coordinate with the SJVAPCD to assess situations in which toxic risk from diesel PM may occur and to review methodologies that may become available to estimate the risk. The developers shall implement any project-level measures adopted by the SJVAPCD to reduce mobile- _ source TACs emissions. Implementation of the above mitigation measure would remain significant and unavoidable because,as indicated in the impact discussion,the proposed project would result in a potentially significant increase in mobile-source TAC emissions, associated primarily with diesel trucks operating on commercial and industrial land. Mobile-source TACs are a relatively new concern for the ARB. No specific guidelines and practices regarding assessing impacts and providing mitigation are available. It is also unclear what effects the ARB's new — diesel-engine emission standards and diesel particulate-matter regulations would have on the level of impact and the necessity for,or type of,mitigation. Therefore,the specific conditions of mobile-source TAC impacts cannot be determined at this time. The only available mitigation,completely separating emission sources(diesel - vehicles)from all sensitive receptors,is not a feasible mitigation measure for a mixed use project such as College Park. This conclusion could change in the future if effective, statewide regulatory controls are implemented. IMPACT Air Quality—Possible Temporary and Occasional Exposure of New Sensitive Uses to Odors. The 4.12-3 proposed project would not include the types of land uses that would generate objectionable odors that could adversely affect either existing or proposed sensitive land uses. However, the proposed project could result in the development of n9w sensitive land uses(residential)adjacent to two existing on-site dairies. This could expose the new sensitive uses to objectionable odors from these dairies on a temporary basis until these dairies are replaced with urban development under the proposed project. A significant impact could occur. — EDAW College Park at Mountain House Specific Plan 111 Draft EIR Air Quality 4.12-22 San Joaquin County