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Jonathan Hayes - Greystar Updated March 15, 2017 - Page 11 cancer health risks were calculated using the DPM model results and the methods recommended by the BAAQMD, as described in Attachment 1. As shown in Table 2 the increased lifetime cancer risk would be below the BAAQMD significance threshold of a cancer risk greater than 10.0 in one million and would be considered a less than significant impact. Potential non-cancer health effects due to chronic exposure to DPM were computed as a HI of less than 0.01. The location of maximum cancer risk is shown on Figure 2. Details of the emission calculations, dispersion modeling and cancer risk calculations are contained in Attachment 2. Table 2 Health Risk Impacts from Caltrain Rail Line Distance Cancer Risk (per million) Annual PM2.5 (µg/m3) Hazard Index Caltrain at assuming electrification 4.2 0.02 <0.01 Caltrain with no electrification 9.6 0.02 <0.01 BAAQMD Thresholds 10.0 0.3 1.0 BAAQMD-Permitted Stationary Sources BAAQMD’s Stationary Source Screening Analysis Tool was used to identify stationary sources that may affect future residential development at the site. This is a Google Earth map tool used to identify BAAQMD permitted stationary sources. The linked database includes the associated estimated cancer risk and hazard impacts predicted by BAAQMD. Two sources affecting the site were identified: Plant 17462 is a generator located at 1017 Middlefield Road belonging to the City o f Redwood City (#5546). The BAAQMD Google Earth Tool provides screening community risk levels that are adjusted for distance (i.e., 900 feet) using their diesel engine multiplier tool. Plant 13509 is a generator located at 1121 Jefferson Avenue belonging to AT&T Corporation (formally permitted to PacBell). Screening community risk levels were computed to exceed the significance thresholds; therefore, BAAQMD was contacted to obtain equipment and emissions information to conduct dispersion modeling using the EPA’s ISCST3 model to assess the effects of this generator on the project site. BAAQMD provided average daily and annual emissions along with a brief description of the equipment. The generator was modeled using stack parameters for the Caterpillar 3512A engine-generator since the BAAQMD permit information indicates a Caterpillar 1,489 hp generator, which is about 1,100 kW. The model 3512A is the closest match to this older generator. The modeling assumed a 45 foot building height and a 50 foot stack height adjacent to the building. The modeling with ISCST3 included building downwash effects. The same meteorological data, receptor grid and cancer risk calculations used to predict impacts from the rail line were used to compute these generator impacts. Modeling information is contained in Attachment 2. The maximum cancer risk from the generator is 3.0 in one million and the annual PM2.5 concentration is 0.004ug/m3. This maximum occurs adjacent to the southwestern boundary of the residential area, while the maximum risk from the rail line occurred near the northeast corner. Figure 2 shows the location of maximum impact at the project site from the generator. Stationary sources within 1,000 feet and their associated TAC impacts are as follows: 8.A. - Page 94