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San Joaquin Valley Air Pollution Control District District Reference No. 20201050 January 4, 2020 Page 2 Other potential significant air quality impacts related to Toxic Air Contaminants (see information below under Health Risk Assessment), Ambient Air Quality Standards, Hazards and Odors, may require assessments and mitigation. More information can be found in the District's Guidance for Assessing and Mitigating Air Quality Impacts at: https://www.valleyair.org/transportation/GAMAQI 12-26-19.pdf The District offers the following comments: 1) Proiect Related Criteria Pollutant Emissions 1 a) Construction Emissions: Although the construction-related emissions are expected to have a less than significant impact, the District suggests that the County advise project proponents with construction-related exhaust emissions and activities resulting in less than significant impact on air quality to utilize the cleanest reasonably available off-road construction fleets and practices (i.e. eliminating unnecessary idling) to further reduce impacts from construction-related exhaust emissions and activities. 1 b) Recommended Model: Project related criteria pollutant emissions from construction and operational sources should be identified and quantified. Emissions analysis should be performed using CalEEMod (California Emission Estimator Model), which uses the most recent approved version of relevant Air Resources Board (ARB) emissions models and emission factors. CalEEMod is available to the public and can be downloaded from the CalEEMod website at: www.caleemod.com. 1 c) Electric On-Site Off-Road and On-Road Equipment Since the Project consists of a warehouse and storage facility, it may have the potential to result in increased use of off-road equipment (i.e. forklifts) and/or on-road equipment (i.e. mobile yard trucks with the ability to move materials). The District recommends the County advice the project proponent to utilize electric or zero emission off-road and on-road equipment used on-site for this Project. 1 d) Health Risk Screening/Assessment Located directly south west of the Project, there are sensitive receptors such as single family residential units. The Health Risk Assessment should evaluate the risk associated with sensitive receptors in the area and mitigate any potentially significant risk to help limit emission exposure to sensitive receptors.