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San Joaqu/n Va//ay Atr Po//utlon Con[ro/O/strict P®ga 2 OlstNcf R¢I¢r¢nc¢No.20201092 January>2 2021 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 Guitlance for Assessing and Mitigating Air Quality Impacts at: htt �//www vallevair ora/t o rt t' /GAMAQI 12-26-19 odf The District offers the following comments: 1) Protect Related Criteria Pollutant Emissions The District recommends that a more detailed preliminary review of the Project be conducted for the Project's construction antl operational emissions. The additional environmental review of the Project's potential impact on air quality should consider the following items: ia) Protect Related Construction Emissions Construction emissions are short-term emissions and should be evaluated separately from operational emissions. Equipment exhaust, as well as fugitive dust emissions should be quantified. For reference, the District's annual criteria thresholds of significance for construction are listed above The District recommends that the County consider the use of the cleanest reasonably available off-road construction practices (i.e. eliminating unnecessary idling) and fleets, as set forth in §2423 of Title 13 of the California Code of Regulations, antl Part 89 of Title 40 Code of Federal Regulations as a mitigation measure to reduce Project related impacts from construction related exhaust emissions. �b) Prosect Related Operational Emissions Emissions from stationary sources and mobile sources should be analyzed separately. For reference, the District's annual criteria thresholds of significance for operational emissions are listed above. 1c) Recommended Model Project related criteria pollutant emissions from construction and operational sources should be identified and quantified. Emissions analysis should be performed using CaIEEMod (California Emission Estimator Modep, which uses the most recent approved version of relevant Air Resources Board (ARB)