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Environmental Checklist Air Quality Draft Initial Study – Mitigated Negative Declaration 37 6. All excavation, grading, and/or demolition activities shall be suspended when average wind speeds exceed 20 mph. 7. All trucks and equipment, including their tires, shall be washed off prior to leaving the site. 8. Unpaved roads providing access to sites located 100 feet or further from a paved road shall be treated with a 6- to 12-inch compacted layer of wood chips, mulch, or gravel. 9. Publicly visible signs shall be posted with the telephone number and name of the person to contact at the lead agency regarding dust complaints. This person shall respond and take corrective action within 48 hours. The Air District’s General Air Pollution Complaints number shall also be visible to ensure compliance with applicable regulations. LESS THAN SIGNIFICANT WITH MITIGATION INCORPORATED c. Would the project expose sensitive receptors to substantial pollutant concentrations? Certain population groups, such as children, the elderly, and people with health problems, are particularly sensitive to air pollution. Therefore, the majority of sensitive receptor locations are schools, hospitals, and residences. Sensitive receptors in the project vicinity include single- and multi-family residences located 500 feet south of the project site. The following four criteria based on BAAQMD health risk and hazard significance thresholds were applied to determine if the proposed project would significantly impact the exposure of sensitive receptors to project emissions (Appendix B). The project would have a significant impact if: ▪ Construction of the project would generate toxic air contaminants (TACs) that exceed health risk significance thresholds; ▪ The cumulative health impact would exceed cumulative health risk significance thresholds; ▪ Operation of the project would result in an exceedance of the health risk significance thresholds; ▪ A carbon monoxide (CO) hotspot assessment demonstrates that the project would result in a CO hotspot which would exceed ambient air quality standards. These criteria are discussed in the following subsections. Project Construction TACs FirstCarbon Solutions conducted an assessment of potential health impacts to surrounding sensitive receptors resulting from construction TAC emissions, using the methodology described under Methodology in this section. The detailed assessment is provided in Appendix B. Diesel particulate matter (DPM) has been identified by CARB as a carcinogenic substance. Major sources of DPM include off-road construction equipment and heavy-duty trucks used for construction. For the purposes of this analysis, DPM is represented as exhaust emissions of PM2.5. Generation of DPM from construction projects typically occurs in a single area for a short period. BAAQMD developed a set of guidelines and thresholds for estimating health risks resulting from exposure to TACs at the Maximally Impacted Receptor (MIR). For the proposed project, the MIR includes single family residences located approximately 500 feet southwest of the project site on Monogram Street. Table 10 below summarizes PM2.5 exhaust emissions generated during project construction.