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be conducted until after the onset of the rail non~breeding season, which would be from September 1 through January 31. Other construction activities could proceed outside of that window. (c) To avoid impacts to saltmarsh common yellowthroat and Alameda song sparrow, the bike path should be located to avoid disturbance of existing shrub habitat. If avoidance of the shrub habitat is not feasible, construction shall be initiated after the breeding season (March through July) and shrub vegetation shall be removed within the construction footprint during the non-breeding season (August through February). Alternatively, preconstruction breeding bird surveys shall be conducted in the spring. Surveys should be conducted within suitable nesting habitat in tidal vegetation at the upper end of the channel and in shrubs along levees. All active nests identified at that time shall be protected by a 50..Joot radius exclusion zone. The exclusion zone would remain in place until all young have fledged. Since these birds may have three broods, avoidance would possibly extend into August. (d) To avoid potential impacts of pile driving on juvenile salmonids (steelhead or chinook salmon), the pile-driving portion of the project shall be conducted during the steelhead dredging window allowed by NOAA/NMFS (June I-November 30 in south central San Francisco Bay). No work window is given for chinook salmon within the south central Bay; however, in central San Francisco Bay (north of the Bay Bridge), the work window for chinook salmon is also June I-November 30. Informal consultation with NOAA Fisheries should take place to determine project timing and to obtain the latest data on acoustic impacts and mitigation. Incorporation of the mitigation measures above would mitigate potential impacts to biological resources to a less~than-significant level. Potentially Significant Impact Potentially Significant unless Mitigation Incorporated Less than Significant Impact V. CULTURAL RESOURCES - Would the project: a) Cause a substantial adverse change in the significance of a historical resource as defined in ~ l5064.5? b) Cause a substantial adverse change in the significance of an archaeological resource pursuant to 9l5064.5? c) Directly or indirectly destroy a unique paleontological resource or site or unique geologic feature? d) Disturb any human remains, including those interred outside of fonnal cemeteries? o o o o o o o o o o o o DISCUSSION: No Impact ~ ~ ~ ~ An archival and records review was completed by the California Historical Resources Information System, Northwest Information Center, Sonoma State University, Rohnert Park (CHRISINWIC File No. 04-522 dated December 14,2004). Reference material from the Bancroft Library, University of Y4204IS.OO693.doc - 4/5/07 .19~