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Vista Charter Public Schools District Office and Outdoor Space Project <br />CEQA Exemption 15183 <br />CRITERIA AIR POLLUTANTS <br />Construction Impacts <br />The project proposes to remodel and reoccupy an existing building to use as an office building for <br />Vista Charter Public Schools and is not expected to involve any major construction activities. The <br />project would be constructed over approximately eight months. Earthwork would be balanced on - <br />site and would not require soil import or export. Exhaust emission factors for typical diesel - <br />powered heavy equipment are based on the California Emissions Estimator Model version 2022.1 <br />(CaIEEMod) program defaults. Variables factored into estimating the total construction emissions <br />include the level of activity, length of construction period, number of pieces and types of <br />equipment in use, site characteristics, weather conditions, number of construction personnel, and <br />the amount of materials to be transported on- or off -site. The analysis of daily construction <br />emissions has been prepared utilizing CaIEEMod. Refer to Attachment A for the CaIEEMod <br />outputs and results. Fugitive dust emissions are associated with land clearing, ground excavation, <br />cut -and -fill, and truck travel on unpaved roadways (including demolition as well as construction <br />activities). Exhaust emissions from construction activities include emissions associated with the <br />transport of machinery and supplies to and from the project site, employee commutes to the <br />project site, emissions produced on -site as the equipment is used, and emissions from trucks <br />transporting materials to/from the site. In addition to gaseous and particulate emissions, the <br />application of asphalt and surface coatings creates ROG emissions, which are 03 precursors. <br />Table 1, Proiect-Generated Construction Emissions, presents the anticipated daily short-term <br />construction emissions. <br />Table 1 <br />Project -Generated Construction Emissions <br />Emissions Source <br />Pollutant (poundslda#,' <br />ROG <br />NOx <br />c0 <br />S02 <br />PM10 <br />Year 1 Construction Emissions2 <br />0.59 <br />5.98 <br />7.14 <br />0.01 <br />0.32 <br />0.27 <br />Year 2 Construction Emissions2 <br />0.89 <br />5.65 <br />7.11 <br />0.01 <br />0.44 <br />0.25 <br />Maximum Daily Emissions <br />0.89 <br />5.98 <br />7.14 <br />0.01 <br />0.44 <br />0.27 <br />SCAQMD Regional Thresholds <br />75 <br />100 <br />550 <br />150 <br />150 <br />55 <br />Threshold Exceeded? <br />No <br />No <br />No <br />No <br />No <br />No <br />Notes: <br />1. Emissions were calculated using CaIEEMod version 2022.1. <br />2. Modeling assumptions include compliance with SCAQMD Rule 403 which requires: properly maintain mobile and other construction <br />equipment; replace ground cover in disturbed areas quickly; water exposed surfaces three times daily; cover stockpiles with tarps; water <br />all haul roads twice daily; and limit speeds on unpaved roads to 15 miles per hour. <br />Source: Refer to Attachment A for assumptions used in this analysis. <br />Construction Emissions Conclusion <br />With the implementation of RR AQ-2 and AQ-3, criteria pollutant emissions during construction of <br />the proposed project would not exceed the SCAQMD significance thresholds; refer to Table 1. <br />Thus, total construction related air emissions would be less than significant. <br />Operational Impacts <br />Long-term operational air quality impacts consist of mobile source emissions generated from <br />project -related traffic and emissions from stationary area and energy sources. It should be noted <br />that emission reductions from the existing uses are not taken into account as they are currently <br />vacant. Area source emissions include those generated by architectural coatings, consumer <br />Dec i y ouncil 26 — 74 1/16/20'2 e 14 <br />