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Soil Investigations for Data Collection in the Delta Initial Study/Proposed Mitigated Negative Declaration viii experience conducting surveys to identify the specific rookery bird species and associated habitat that could occur on site. b. If any active rookeries are identified within or adjacent to an Impact Area, a buffer will be put in place to ensure that the birds are not disturbed during work activities. This buffer will be up to 50 feet, but can be smaller, dependent on-site conditions and at the discretion of the qualified biologist. MM BIO-6: Raptors (excluding Swainson’s Hawk and Burrowing Owl) To minimize and avoid the potential impacts to special-status raptors that may occur within the Study Area the following general measures will be implemented: a. For soil investigation field activities that will occur between February 1 – August 31, a pre-activity survey for actively nesting raptors will be conducted by a qualified biologist a maximum of 72 hours prior to the onset of project activities. The qualified biologist(s) must, at a minimum, have experience conducting surveys to identify the specific species and associated habitat that could occur on site. b. If any active raptor nests are identified within or adjacent to an Impact Area by the pre-action survey, a buffer will be put in place to avoid disturbance to birds during and as a result of work activities. This buffer will be up to 250 feet, but can be smaller, dependent on-site conditions and at the discretion of the qualified biologist. c. Any identified actively nesting raptors will be monitored by a qualified biologist during activity activities for signs of distress or disturbance as a result of field activities. Should the birds show signs of distress, work will cease at that location until the birds have resumed normal behavior and it is determined by the on-site biologist that work can be resumed. MM BIO-7: Tricolored Blackbird To minimize and avoid the potential impacts to Tricolored Blackbird that may occur within the Study Area the following general measures will be implemented: a. For soil investigation field activities that will occur March 15- July 31 in areas with potential breeding habitat for Tricolored Blackbird, a pre-activity survey for breeding colonies will be conducted by a qualified biologist within 1,300 feet of Impact Areas a maximum of 72 hours prior to the onset of soil investigation activities. The qualified biologist(s) must, at a minimum, have experience conducting surveys to identify Tricolored Blackbird and associated habitat that could occur on site. b. For soil investigation field activities that will occur August 1 – March 14 in areas with potential roosting habitat for Tricolored Blackbird, a pre-activity survey for roosting Tricolored Blackbirds will be conducted during the nonbreeding season within 300 feet of Impact Areas a maximum of 72 hours prior to the onset of soil investigation activities by a qualified biologist.