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7.B. - Page 79 Redwood City Chapter 4.Environmental Impact Analysis meteorological conditions.Typical winds during late spring through summer are from the north or northwest.Nearby land uses,especially those residences located to the south could be adversely affected by dust generated during construction activities.The BAAQMD CEQA Air Quality Guidelines consider the dust impacts to be less than significant if BMPs are employed to reduce these emissions. Implementation of fugitive dust control mitigation measures identified in Standard Condition 4.5-1 and Mitigation Measure 4.5-1 above (Standard Condition 4.5-1 and Mitigation Measure 4.5-1 of the 2007 FEIR [page 4.5-10]) would be consistent with Policy PS-1.5 in the General Plan and would reduce construction-related fugitive dust emissions to less than significant. Construction Toxic Air Contaminants Less-than-Significant New Impact.As discussed below,health risk impacts associated with operation of the project plus proposed modifications would be less than significant.As shown in Tables 4.4-4 and 4.4-5,the proposed modifications would generate fewer daily exhaust PM10 emissions during construction than during operation.Furthermore,project construction would only last 7 weeks.Therefore,it is concluded that health risk impacts associated with construction of the proposed modifications would be less than significant. Operation Toxic Air Contaminants Less-than-Significant New Impact.In February 2008,the BAAQMD conducted a health risk screening analysis,using dispersion modeling,to evaluate the potential health risks associated with the Costco fueling center(Bay Area Air Quality Management District 2008).The analysis assumed a gasoline throughput of 29.8 million gallons per year(the maximum allowable throughput without requiring emission offsets under the BAAQMD's New Source Review Rule). In May 2011,the BAAQMD issued new health risk modeling guidance,recommending application of the following Age Sensitivity Factors (ASFs) to account for the increased susceptibility of infants and children to carcinogens. • Residential receptors: 1.7. • Employee receptors: 1.0. • Student receptors: 3.0. The factors were incorporated to the BAAQMD estimated excess cancer risks. Table 4.4-8 summarizes the excess cancer risks with the ASFs and the BAAQMD estimated chronic non-cancer hazard indices.Additional documentation is provided in Appendix A.Health risks associated with PM2.5 emissions were not evaluated because gasoline dispensing facilities do not emit PM2.5 emissions.The table shows that the project-level health risk impacts associated with operation of original project plus the proposed modifications would be less than significant. Table 4.4-8. Project-Level Health Risk Analysis for Original Project Plus the Proposed Modifications Excess Cancer Risk Chronic Non-cancer Receptor (per million) Health Index Resident 2.1 0.0007 Worker 1.6 0.0047 Student(Hoover Elementary School) 0.1 0.0004 BAAQMD Thresholds > 10 > 1.0 Addendum No.2 to the Environmental Impact Report for 4-34 September 2012 the Redwood City Costco Wholesale Project ICF 00154.12