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ripgut brome (Bromus diandrus), and milk thistle(Silybum marianum). Older deposition areas are dominated shrub/tree species such as Coyote bush (Baccharis pilularis), tree tobacco (Nicotiana glauca),Fremont's cottonwood, and willows. Sensitive Species Visual surveys were conducted for all wildlife throughout the island on December 15, 16, and 17, 2004. Visual surveys resulted in observations of California Black Rail (Laterallus jamaicensis coturiculus)individuals and a Great Blue Heron (Ardea herodias)rookery. Other incidental observations included a potential Red-tailed Hawk (Buteo jamaicensis)nest and scattered Elderberry shrubs (host plant of the valley elderberry longhorn beetle, a federally listed threatened species). Minimization and avoidance measures for these species are described below. California Black Rail. The presence of California black rail within the project area will likely require the project proponent to either restrict the contractor to conducting work during the rail non-breeding season (August to March), or conduct a pre-construction rail nest survey before March 1. Any active rail nests found during the survey should be protected until the young birds have fledged the site. If possible, the contractor should be prohibited from conducting work within 500 feet of the active nest until after the young have fledged. These minimization and avoidance measures are based upon other projects with potential impacts to California black rail. Based upon recent conversations with CDFG,there are no standard minimization and avoidance measures for potential impacts to California black rail. Consultation with the California Department of Fish and Game (CDFG) would be necessary to determine the appropriate minimization and avoidance measures for this project. Great Blue Heron rookery. The presence of a great blue heron rookery within the project area would likely restrict construction and recreational activity within 600 feet of the rookery during the nesting season(March to August). These minimization and avoidance measures are based upon other projects with potential impacts to great blue heron rookeries. Based upon recent conversations with CDFG, there are no standard minimization and avoidance measures for potential impacts to great blue heron rookeries. Project specific consultation with CDFG would be necessary to determine the appropriate minimization and avoidance measures for this project. Raptor species. The potential presence of raptor nests within the project area will require the project proponent to conduct preconstruction raptor nest surveys prior to the start of active construction within the general nesting season (March through mid August). The presence of active raptor nests often prohibits construction activities within 200 feet of an active raptor nest until the young birds have fledged. Construction buffers for nesting raptors vary depending upon the location of the nest and the nature of the project. Consultation with the California Department of Fish and Game would be necessary to determine the appropriate minimization and avoidance measures for this project.