Reso PC16-23 PC 0116 Reso CEQA - Sandpiper

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Section 4.0— Environmental Setting and Discarssion ofhnpacts 4.3.3.3 Long -Teri Operational Air Quality Impacts from the Proposed Project (Checklist Questions 2-5) Operational emissions typically represent the majority of a project's air quality impacts. After a project is built, operational etnissions, including mobile and area sources, are anticipated to occur continuously throughout the project's lifetime. Operational Criteria Air Pollutants Operational activities, including increased vehicle trips to and from the school and building maintenance, generate criteria air pollutant emissions. The BAAQMD screening level for elementary school -related operational criteria pollutant emissions is 271,000 sf or 2,747 students. The proposed project includes the addition of approximately 17,200 sf of building space and would increase student capacity at the school by 220 students. Therefore, the proposed project is below the BAAQMD screening levels and would result in a less than significant long-term operational air quality impact. (Less Than Significant Impact) Toxic Air Contaminants Operational activities at the project site do not include the operation of diesel equipment or other substantial sources of TAC emissions, Per Section 21151.8 of the PRC, a letter was sent to BAAQMD requesting the locations of permitted and non -permitted facilities within one-quarter mile of the campus that might reasonably be anticipated to emit hazardous emissions. At this time no response from BAAQMD has been received. Additionally, Sandpiper Elementary School is approximately 9,800 feet northeast of the closest freeway traffic lane (US Route 101). For these reasons, operation of the proposed project would not expose sensitive receptors to substantial TAG concentrations. (Less Than Significant Impact) 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 volumes at the intersections affected by the proposed project remain below 44,000 vehicle trips per hour. The project will generate 286 new/additional vehicle trips during the AM peak hour of traffic and existing intersection volumes in the project area are approximately 4,500 trips during the AM peak hour. Additionally, the Traffic Impact Analysis completed by Hexagon Transportation Consultants for the project identifies the Marlin Drive and Redwood Shores Parkway intersection to have the greatest AM peak hour intersection volume with 1,032 AM peak hour trips under the Cumulative Plus Project Condition. Therefore, intersection volumes in the project area with the proposed project would remain below 44,000 vehicle trips per hour, and the proposed project would not cause or contribute to a violation of the ambient air quality standard for carbon monoxide. (Less Than Significant Impact) City of Redwood City 25 Initial Study/Mitigated Negative Declaration Sandpiper Elementary School Facilities Expansion November 2016