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Screening Health Risk Assessment for 3370 Hopyard Road Project The numerical thresholds above are consistent with the project-level and cumulative health risk threshold included in BAAQMDs CEQA Thresholds Options and Justification Report(BAAQMD 2009). Toxic Air Contaminants/Health Risk Calculation Results As discussed previously,the BAAQMD's set of screening analysis tools was used to identify off-site sources of TACs.The Stationary Source Screening Analysis Tool(BAAQMD 2012b)indicates several permitted TAC sources in the area,but none located are within 1,000 feet of the Project Site boundary. Figure 1 shows the location of the Project Site and a 1,000-foot radius around the Project Site. As shown,there are no stationary sources within 1,000 feet of the Project Site boundary. Therefore, stationary sources would not contribute substantially to the Project Site's health risk impact. The Roadway Screening Analysis Calculator(BAAQMD 2015)was used to evaluate health risks from Hopyard Road. ADT values along the segment of Hopyard Road adjacent to the Project Site were obtained from the City's Circulation Element of the General Plan(City of Pleasanton 2005).According to Table 3-6 of the Circulation Element, Hopyard Road south of W Las Positas Boulevard has estimated peak hour volumes of 4,470 under existing(i.e.,2005)conditions and 5,400 under 2025 future buildout conditions.According to the Federal Highway Administration(FHWA), daily trips are typically estimated from peak hour volumes general assumption that peak-hour trips represent approximately 10 percent of daily trip volumes(FHWA 2017). Therefore,the ADT would be 44,700 under existing(i.e., 2005)conditions and 54,000 under 2025 future buildout conditions. The results of this screening health risk assessment are shown in Table 1,which summarizes the carcinogenic risk and PM2.5 impacts for the maximally impacted Project Site sensitive receptor from combined sources of TAC emissions within 1,000 feet of the Project Site, including cumulative traffic along Hopyard Road. Health risk impact values are provided as a range to represent 2005 and 2025 ADTs along Hopyard Road. Health risk calculations are provided in Appendix A of this memorandum. TABLE 1 MAXIMUM UNMITIGATED HEALTH RISK IMPACTS FROM COMBINED OFF-SITE SOURCES OF TACS Project Sensitive Receptor Cancer Risk Maximum Impacts (#in one million) Max Annual PM2.5(pg/m') Operational Cumulative Impacts Combined Sources within 1,000 Feet of Project Site Stationary Sources Neg. Neg. Hopyard Road 22.05 to 24.79 0.392 to 0.440 Combined Maximum Total 24.79 0.440 BAAQMD Significance Threshold 100 0.8 Exceeds Threshold? No No SOURCES:BAAQMD 2017;ESA 2017. CWIN\53247\1016910.1/Yountville Hill Winery Project 4 ESA/MSRGOO1AQ