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SAN LEANDRO SHORELINE DEVELOPMENT DRAFT EIR <br />CITY OF SAN LEANDRO <br />AIR QUALITY <br />nonattainment designations of the Air Basin and impacts would be less than significant with <br />mitigation. <br />AIR -5 Construction of the Project could expose sensitive receptors to <br />substantial concentrations of air pollution. <br />On -Site and Off -Site Community Risk and Hazards During Construction <br />The Project would elevate concentrations of TACs and PM2.5 in the vicinity of sensitive land uses during <br />construction activities. Construction activities could occur proximate to sensitive receptors both on-site <br />and off-site. Additional sensitive receptors would be the on-site residents living in the North Residential <br />Apartments or the South Mixed -Use Condos/Apartments during the second phase of construction. <br />Consequently, a full health risk assessment (HRA) of TACs and PM2,5 is warranted. <br />Sources evaluated in the HRA include off-road construction equipment and heavy-duty diesel trucks along <br />the truck route. The US EPA ISCST3 dispersion modeling program was used to estimate excess lifetime <br />cancer risks and acute and chronic non -cancer hazard indexes at the nearest sensitive receptors. Results <br />of the analysis are shown in Table 4.2-8. <br />TABLE 4.2-8 CONSTRUCTION RISK SUMMARY <br />Project Level Risk <br />Cancer Risk—Adult Cancer Risk—Child Chronic <br />Receptor (per million) (per million) Hazards PM2.5 <br />Off -Site Resident 8.3 44 0.22 0.68 <br />On -Site Residenta <br />2.6 <br />14 0.07 0.22 <br />Threshold 10 10 1.0 0.3 µg/m3 <br />Exceeds Threshold No Yes No Yes <br />a. On-site residents (living in the North Residential Apartments or the South Mixed -Use Condos/Apartments) would only be exposed to construction <br />emissions during the second phase of construction. Off-site residents would be exposed to construction emissions for all construction phases. <br />Source: Lakes AERMOD View, 8.7, 2014. <br />The results of the HRA are based on the maximum receptor concentration over a 5 -year construction <br />exposure period for off-site receptors and 1.5 -year construction period for on-site receptors, assuming <br />24-hour outdoor exposure, and averaged over a 70 -year lifetime. The results of the HRA indicate that the <br />incremental cancer risk for off-site residents proximate to the site during the construction period is 8.3 <br />per million for the adult -scenario, which would not exceed the cancer risk threshold; and 44 per million <br />for the child scenario, which would exceed the cancer risk threshold. The results of the HRA indicate that <br />the incremental cancer risk for on-site residents proximate to the site during the second phase of <br />construction is 2.6 per million for the adult -scenario, which would not exceed the threshold; and 14 per <br />million for the child scenario, which would exceed the cancer risk threshold. For non -carcinogenic effects, <br />the hazard index identified for each toxicological endpoint totaled less than one for both off-site and on- <br />site residents. Therefore, chronic non -carcinogenic hazards are within acceptable limits. In addition, PM2.5 <br />annual concentrations would exceed the BAAQMD significance thresholds for off-site residents. <br />PLACEWORKS 4.2-29 <br />