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2 Environments 7.B. - Page 53 <br /> Management Practices for fugitive dust as a mitigation measure. See Mitigation Measure AIR 1. <br /> (Less than Significant Impact with Mitigation Incorporation) <br /> d)Expose sensitive receptors to substantial pollutant concentrations? <br /> Diesel-fueled equipment used during construction would emit diesel particulate matter (DPM),a <br /> toxic air contaminant (TAC). Based on BAAQMD screening tables for evaluating toxic emissions <br /> during construction (May 2010), a one-acre project needs an offset distance of more than 100 meters <br /> (382 feet) to ensure that a sensitive receptor would not have a significant health risk. The proposed <br /> project activities would be more than 400 feet from the closest sensitive receptors. Thus,the diesel <br /> emissions from the proposed construction activities would not result in a significant increase in the <br /> risk from TACs. (Less than Significant Impact) <br /> e) Create objectionable odors affecting a substantial number of people? <br /> Other than diesel exhaust during construction,the proposed project would not result in any <br /> objectionable odors. Diesel odors would be undetectable beyond the immediate construction areas <br /> and would not affect the sensitive receptors. The nearest receptors are approximately 400 feet from <br /> the project. (Less than Significant Impact) <br /> 2.4 BIOLOGICAL RESOURCES <br /> The Biological Resource Study (BRS) for the proposed project describes the project area and <br /> evaluates project impacts to special-status plant and animal species,habitat, natural communities, <br /> and jurisdictional waters and wetlands regulated by federal, state,and local agencies (see Appendix D <br /> for Biological Resource Study). The analysis also contains the results of database searches including <br /> the California Native Plant Society (CNPS), California Natural Diversity Database (CNDDB), <br /> Wildlife Habitat Relation System,and the United States Fish and Wildlife Service (USFWS) online <br /> database (WRECO,2013). WRECO biologists conducted a vegetation survey and reconnaissance <br /> level wildlife habitat assessment of the proposed project site and surrounding study area on <br /> February 22,2013. <br /> Most of the study area consists of native and non-native ruderal vegetation adjacent to an existing <br /> footpath along the creek bank. Of the approximately one acre that would be disturbed by the project <br /> construction,0.3 acres is barren due to frequent disturbance, right-of-way maintenance,and highly <br /> compacted soils. Soil types are urban land-Orthents,reclaimed complex,with 0 to 2 percent slopes, <br /> hydric soils typically found along tidal flats throughout the San Francisco Bay. Adjacent areas include <br /> grasslands and salt marsh along the eastern and western banks of the creek. <br /> The project area is approximately 0.25 miles from the Don Edwards San Francisco Bay National <br /> Wildlife Refuge (DESFNWR) on Bair Island. The DESFNWR consists of 23,000 acres of open bay, <br /> salt marshes,vernal pools, and mud flats. It is home to a variety of migratory birds and endangered <br /> species (City of Redwood City,2011). <br /> 2-13 US 101 Pedestrian Undercrossing and Bair <br /> Island Road Storm Drain Pump Station Project <br />