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SAN LEANDRO SHORELINE DEVELOPMENT DRAFT EIR <br />CITY OF SAN LEANDRO <br />AIR QUALITY <br />Consequently, the Project would expose sensitive receptors to substantial concentrations of air pollutant <br />emissions during construction, and impacts would be significant. <br />Impact AIR -5: Construction activities of the Project could expose sensitive receptors to substantial <br />concentrations of TAC and PM2.5- <br />Mitigation Measure AIR -5: The construction contractor shall use equipment that meets the United <br />States Environmental Protection Agency (EPA) -Certified Tier 3 emissions standards for off-road diesel - <br />powered construction equipment greater than 50 horsepower. Any emissions control device used by <br />the contractor shall achieve emissions reductions that are no less than what could be achieved by a <br />Level 3 diesel emissions control strategy for a similarly sized engine, as defined by CARB regulations. <br />Prior to construction, the project engineer shall ensure that all demolition and grading plans clearly <br />show the requirement for EPA Tier 3 or higher emissions standards and Level 3 diesel emissions <br />control for construction equipment over 50 horsepower. During construction, the construction <br />contractor shall maintain a list of all operating equipment in use on the Project Site for verification by <br />the City of San Leandro Building Official or their designee. The construction equipment list shall state <br />the makes, models, and numbers of construction equipment on-site. Equipment shall properly service <br />and maintain construction equipment in accordance with the manufacturer's recommendations. <br />Construction contractors shall also ensure that all nonessential idling of construction equipment is <br />restricted to five minutes or less in compliance with California Air Resources Board's Rule 2449. <br />Significance After Mitigation: Less than significant. Mitigation Measures AIR -5 would reduce the <br />Project's localized construction emissions. The mitigated health risk values were calculated and are <br />summarized in Table 4.2-9. The results indicate that with mitigation, the excess cancer risk for the <br />adult and child exposure scenarios would be less than the threshold values. Additionally, the PM2.5 <br />annual concentrations would be below the significance threshold with mitigation. Consequently, the <br />Project would not expose sensitive receptors to substantial concentrations of air pollutant emissions <br />during construction and impacts would be less than significant with mitigation. <br />TABLE 4.2-9 CONSTRUCTION RISK SUMMARY WITH MITIGATION <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 1.4 7.9 0.05 0.24 <br />On -Site Residenta <br />0.3 <br />1.6 <br />0.01 <br />0.08 <br />Threshold <br />10 <br />10 <br />1.0 <br />0.3 µg/m3 <br />Exceeds Threshold <br />No <br />No <br />No <br />No <br />a. On-site residents (living in the North Residential Apartments or the South Mixed -Use Condos/Apartments) would only be exposed to <br />construction emissions during the second phase of construction. Off-site residents would be exposed to construction emissions for all <br />construction phases. <br />Source: Lakes AERMOD View, 8.7, 2014. <br />4.2-30 DECEMBER 2014 <br />