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Jonathan Hayes - Greystar Updated March 15, 2017 - Page 2 with and without electrification. Changes to the scenario of the Caltrain analysis that does not assume Caltrain electrification include the following: 1. A new scenario that assumes only diesel train use the rail line for the next 30 years; 2. An increase in the number of passenger trains, although it is unlikely that Caltrain would increase service with additional diesel trains due to peak-hour capacity issues; and 3. Modification of train speeds in the area due to crossing information obtained from the Federal Rail Administration. Significance Thresholds Mitigation Measure 12-1 requires projects that contain sensitive receptors (e.g., residents) proposed within 500 feet of high volume roadways to include an analysis of the potential health risks that comply with adopted standards of the BAAQMD. This measure also applies to land uses proposed within 500 feet of El Camino Real, Caltrain (until electrification is completed). The BAAQMD provides guidance in assessing impacts to lead agencies in the Bay Area. In May 2011, BAAQMD adopted new California Environmental Quality Act (CEQA) Air Quality Guidelines that included thresholds of significance to assist in the review of projects under CEQA. These thresholds were designed to establish the level at which BAAQMD believed air pollution emissions would cause significant environmental impacts under CEQA and were posted on BAAQMD’s website and included in the Air District's updated CEQA Guidelines.1 The BAAQMD CEQA Air Quality Guidelines consider exposure of sensitive receptors to air pollutant levels that result in an unacceptable cancer risk or hazard, to be significant. For cancer risk, which is a concern with diesel particulate matter (DPM) and other mobile-source TACs, the BAAQMD considers an increased risk of contracting cancer that is 10 in one million chances or greater, to be significant risk for a single source. The BAAQMD CEQA Guidelines also consider single-source TAC exposure to be significant if annual PM2.5 concentrations exceed 0.3 micrograms per cubic meter (µg/m3) or if the computed hazard index (HI) is greater than 1.0 for non-cancer risk hazards. Cumulative exposure is assessed by combining the risks and annual PM2.5 concentrations for all sources within 1,000 feet of a project. The thresholds for cumulative exposure are an excess cancer risk of 100 in one million, annual PM2.5 concentrations of 0.8 µg/m3, and a HI greater than 10.0. Attachment 1 includes a description of how community risk impacts were computed. It is noted that in a direct challenge to the BAAQMD CEQA Air Quality Guidelines, the California Supreme Court held that CEQA does not require the analysis of the environment on future residents of a project. (California Building Industry Assn. v. Bay Area Air Quality Management Dist. (2015) 62 Cal.4th 369.) While the analysis of the exposure of sensitive receptors to air pollutant levels falls directly within the category of the environment’s effect on future residents, the analysis of the exposure of sensitive receptors to air pollutant levels has been conducted for informational purposes and in relation to Mitigation Measure 12-1. TAC Impacts 1 Bay Area Air Quality Management District. 2011. BAAQMD CEQA Air Quality Guidelines. May. 8.A. - Page 85