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09/09/2013 Impact: Impact 8-3: Community Risk and Hazard Impacts. Project development could expose attendees of the on-site child care center to significant levels of PM2.5. Significant impacts from the Tyco Thermal Controls Facility to attendees of the proposed child care facility are anticipated to be significant regardless of where the child care facility is located within the Precise Plan area. Mitigation: Mitigation 8-3. Buffer the child care center from existing and planned emission sources, and include project features to reduce TAC and PM2.5 exposure from air pollutant sources--which include US 101 traffic, the Tyco Thermal Controls facility, and existing and proposed generators--through the following measures: 1. When construction of a child care center is proposed, conduct site-specific detailed analysis to determine the child care center's TAC and PM2,5 exposures. The analysis should be utilized to guide final design and siting of the child care facility and determine the level of ventilation/ filtration necessary to ensure that indoor concentrations will be less-than-significant. 2. Evaluate and appropriately buffer the child care center from existing diesel generators at the Stanford Medicine Outpatient Center and 550 Broadway, and any other sources near the Precise Plan area identified by BAAQMD at the time such analysis is undertaken. 3. Ensure that the ventilation/filtration systems in the child care center result in an indoor cancer risk of less than 10 in one million and annual PM2,5 concentrations of less than 0.3 Ng/m3 from any single source or less than 100 in one million cancer risk and annual PM2.5 concentrations of less than 0.8 Ng/m3 from cumulative resources. 4. Consider tiered plantings of trees between the child care center and air pollutant sources such as the freeway, existing and planned generators, and the Tyco Thermal Controls facility. 5. Avoid location of any truck loading zones near the child care facility. 6. With respect to outdoor use areas for the child care center, impacts from US 101 shall be mitigated by placing the child care center more than 700 feet from the freeway. Based on currently available information, the impact from Tyco Thermal Controls cannot be mitigated to a less-than-significant level because the elevated PM2.5 levels from the facility extend across the entire project development site. If the Tyco Thermal Controls facility remains in operation at the time of construction of the child care center, and if the detailed analysis described above shows PM2.5 levels exceeding the 0.3 Ng/m3 standard throughout the development site, construction and operation of a child care center on the development site shall be prohibited. If the detailed analysis shows that some or all of the development site would be exposed to PM2,5 levels lower than 0.3 Ng/m3, the outdoor use area for the child care center shall be sited in one of those locations. ATTY/RES0.2901/STANFORD EIR CERTIFICATION RESO.#15294 REV:09-10-13 VR MUFF#100 Page 12 of 55