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City of Pleasanton—Villages at the Quarry Project Consistency Checklist 15183 Consistency Checklist 62 student risk calculations utilized a starting exposure age appropriate to the youngest preschool students (18 months) in attendance and a project- specific exposure construction duration of 5.1 years. Cancer risks utilized the 95th percentile 8-hour breathing rates for moderate activity specific to this age range. These breathing rates are documented in Table 5.8 of the OEHHA 2015 guideline document. For ages 0–2 the assessment utilizes a breathing rate of 1200 (L/kg per 8 hours) and for ages 2– 9 years the breathing rate is 640 (L/kg per 8 hours). Similar to the worker scenario, student exposures occur only when the non- continuous construction sources are emitting and thus students similarly inhale air with concentrations that are higher than AERMOD predicted long- term average concentrations. Therefore, the Worker (or Student) Adjustment Factor of 4.2 is also applied to the AERMOD predicted annual concentrations for the evaluation of student cancer risk. Table 3 shows the cancer risk, PM2.5 concentrations, and HI risks at the MEIR, the MEIW, and at the school (student risk). Chronic RELs are used to assess not only residential health impacts but also worker and student health impacts. Potential chronic non-cancer health impacts use the long-term annual average concentration regardless of the emitting facility’s schedule. As per the OEHHA guidance, no adjustment factors were used to adjust this concentration for workers or students. As shown in Table 3, the unmitigated cancer risk, annual PM₂﮳₅ concentration, and HI from construction and operational activities at the MEIR, MEIW, and Student location would not exceed the BAAQMD single source significance thresholds. In this case, additional measures are not required under Housing Element Update FEIR MM AIR-1b to reduce impacts below the thresholds. Table 3: Construction Risk Impacts of the Off-site MEIR, MEIW, or Student Locations Source Cancer Risk (per million) Annual PM2.5 (µg/m³) Hazard Index MEIR Project Construction Unmitigated 4.6 0.01 0.00 MEIW Project Construction Unmitigated 1.2 0.02 0.00 Student Project Construction Unmitigated 4.7 0.01 0.00 BAAQMD Single Source Threshold 10.0 0.3 1.0 Exceeds Threshold? No No No