Reso13 PC 13-24 2920 PC Reso-Adopt the Intitial Study MND - Undercrossing

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'Envi�rzmental Analysis Management Pracrices fox fugirive dust as a mitigation measure. See Mitigauon Measure AIR 1. {Less than Significant Impact with Mitigation Incorporation) d)Expose sensitive receptors ta suhstantral pollutant cor2centrations? Diesel-fueled equipment used during construction wouid emit diese�particulate matter (DPM}, a to�c air contasninant (TAC). Based on BAAQNID screening tables for ecaluating toxic emissions during construction (May 2010),a one-acre project needs an offset distance of mo�e t�ian 100 meters (382 feet) to ensu�e that a sensirive receptor would not have a significant health risk. The propased project activities would be more than 400 feet from the closest sensitive receptors. Thus,the diesel emissions from the proposed construcrion activities wauld not result in a significant increase in the risk from TACs. (Less thaa Signi�icant Irnpact) e) Create objectionable odors affeci�.ng a substar�tial rtumber ofpeople? Other than diesel exhaust during constructron,the proposed project would not result in anp objectionable odors. Diesel odors would be undetectable beyond the inunediate construction areas and would not affect the sensitive receptors. The neaxest receptors are appro�mately 400 feet from the project. (L.ess than Significant Impact) 2.4 BIOLOGICAL RESOURCES The Biological Resource 5tudy (BR5) fox the proposed project describes the project area and evaluates project impacts to special-status plant and animal species,habitat,natutal communities, and jurisdictional waters and wetlands regulated by federal,state,and local agencies (see Appendix D for Biological Resouxce Studp). The analysis also contains the results of database searches including the California Narive Plant Society (CNPS), California Natural Diversity Database (CNDDB), Wildlife Habitat Relation System, and the United States Fish and Wildlife Service (USFWS) online database {WRECO,2013). WRECO bioiogists conducted a vegetation survey and reconnaissance level wildlife habitat assessment of tl�e praposed project site and suYrouncrting studp area on February 22,2013. Most of the stud�area consists of native and non-native ruderal vegetation adjacent to an existing footpath along the creek bank. �f the approxirriately one acre that would be disturbed by the p�oject consttuction,0.3 acres is barxen due to frequent disturbance,xight-af-way maintenance,and highly compacted soils. Soil types are urban land-Orthents,reclaimed corr�plex,with 0 to 2 percent slopes, hydric soils typically faund along tidal flats throughaut fhe San Francisco Bay. Adjacent areas include grasslands and salt marsh along the eastern and western banks of the cxeek. The project area is appro�tnately 0.25 miles from the Don Edwards San Francisco Bay National Wildlife Refuge {DESFNWR} on Bair Island. The DESFNWR consists o£23,Od0 ac�es of open bap, salt matshes,vernal pools,and mud flats. It is home to a variety of migratory birds and endangered species (City of Redurood City,2011). 2-13 US ]09 Pede.rtrian Usadercrossirag r�nd Bair Island Kaad Storna Drain Paemj�Stataon Prajec•t