Reso PC16-23 PC 0116 Reso CEQA - Sandpiper

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Section 4.0—Environmental Setting and Discussion oflmpacts Toxic Air Contaminants According to the BAAQMD CEQA Air Quality Guidelines, a project is considered to have a significant TAC impact if it generates an increased cancer risk of greater than 10.0 in one million, an increased non -cancer risk with a hazard index that is greater than 1.0 (chronic or acute), and/or an ambient PM2.5 increase of greater than 0.3 micrograms per meter (µg/m) annual average. Construction Toxic Air Contaminants Construction is considered to have a significant TAC impact if construction activities generate an increased cancer risk of greater than 10.0 in one million, an increased non -cancer hazard risk that is greater than 1.0 (chronic or acute), and/or an ambient PM2.5 increase of greater than 0.3 micrograms per meter (l.tg/m3) annual average. Carbon Monoxide Congested intersections with large volumes of traffic have the greatest potential to cause high - localized concentrations of carbon monoxide. Per the BAAQMD CEQA Air Quality Guidelines, a project would not have a significant carbon monoxide impact if the hourly volumes at the intersections affected by the proposed project remain below 44,000 vehicle trips per hour. Odor Odor screening distances are recommended by BAAQMD for various land uses including wastewater treatment plants, sanitary landfills, etc. It is recommended that odor parameters and complaint history also be considered when determining a significant odor impact. The BAAQMD CEQA Air Quality Guidelines require that locations of all odor sources be identified within a project area. An odor is considered significant if there are five confirmed complaints per year averaged over three years. 4.3.3.2 Clean Air Plan Consistency (Checklist Questions 1) The most recent clean air plan is the Bay Area 2010 Clean Air Plan that was adopted by BAAQMD in September 2010. The project would not conflict with the latest Clean Air planning efforts since, 1) the proposed project is below the BAAQMD construction and operational screening levels as identified in Section 4.3.3.1 above, 2) the project would be considered infill development or a redevelopment as discussed in Section 3. 0, Project Description, and 3) development would be near existing transit as discussed in Section 4.1 G, Transportation. The project is too small to exceed any of the significance thresholds and, thus, is not required to incorporate project -specific transportation control measures listed in the latest Clean Air Plan. (Less Than Significant Impact) City of Redwood City 24 Initial Study/Mitigated Negative Declaration Sandpiper Elementary School Facilities Expansion November 2016