14 ATTACHMENT 6 - Appendix A - E

59 To avoid impacts to active burrowing owl nests, a qualified biologist should conduct pre- construction surveys for burrowing owls within the construction footprint and within 250 ft. of the footprint no more than 30 days prior to the onset of ground disturbance. These surveys should be conducted in a manner consistent with accepted burrowing owl survey protocols. If pre-construction surveys determine that burrowing owls occupy the site during the non-breeding season (September 1 through January 31), then a passive relocation effort (e.g., blocking burrows with one-way doors and leaving them in place for a minimum of three days) may be necessary to ensure that the owls are not harmed or injured during construction. Once it has been determined that owls have vacated the site, the burrows can be collapsed, and ground disturbance can proceed. If burrowing owls are detected within the construction footprint or immediately adjacent lands (i.e., within 250 feet of the footprint) during the breeding season (February 1 through August 31), a construction-free buffer of 250 ft. should be established around all active owl nests. The buffer area should be enclosed with temporary fencing, and construction equipment and workers should not enter the enclosed setback areas. Buffers should remain in place for the duration of the breeding season or until it has been confirmed by a qualified biologist that all chicks have fledged and are independent of their parents. After the breeding season, passive relocation of any remaining owls may take place as described above. 3.3.5 Potential Impacts to Callippe Silverspot Butterflies Potential Impact. A focused survey for the Callippe silverspot butterfly larval host plant, viola, was conducted on the proposed development area, slope stabilization areas and a minimum 75- foot buffer and none were detected. Further, these areas of the site do not support significant populations of nectar plants for the butterfly. Therefore, habitat for this species is considered absent from all areas that are proposed to be impacted by the project and the project is expected to have no impact on this species or its habitat. Mitigation. None required. 3.3.6 Disturbance to Nesting Raptors and Nesting Migratory Birds Potential Impact. Although no trees occur within the areas that will be impacted by the project or by slope stabilization activities, and therefore, the project would not be expected to result in impacts to tree-nesting raptors or other tree-nesting birds, the grassland habitats of the site