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a) If grading or construction activities occur only during the nonbreeding season, between August 31 and February 1, no surveys shall be required. b) Pruning and removal of trees and other vegetation, including grading of grasslands, should occur whenever feasible, outside the breeding season (February 1 through August 31). c) During the breeding bird season (February 1 through August 31) a qualified biologist shall survey activity sites for nesting raptors and passerine birds not more than 14 days prior to any ground - disturbing activity or vegetation removal. Surveys shall include all line -of -sight trees within 500 feet (for raptors) and all vegetation (including bare ground) within 250 feet for all other species. d) Based on the results of the surveys, avoidance procedures shall be adopted, if necessary, on a case -by -case basis. These may include construction buffer areas (up to several hundred feet in the case of raptors) or seasonal avoidance. e) Bird nests initiated during construction are presumed to be unaffected, and no buffer is necessary except to avoid direct destruction of a nest or mortality of nestlings. f) If preconstruction surveys indicate that nests are inactive or potential habitat is unoccupied during the construction period, no further mitigation is required. Trees and shrubs that have been determined to be unoccupied by nesting or other special - status birds may be pruned or removed. 30. Pre - construction Bat Surveys: Prior to issuance of a building or grading permit, a qualified biologist shall conduct a pre- construction special status bat survey when large trees are to be removed or underutilized or vacant buildings are to be demolished. If active day or night roosts are found, the bat biologist shall take actions to make such roosts unsuitable habitat prior to tree removal or building demolition. A no- disturbance buffer of 100 feet shall be created around active bat roosts being used for maternity or hibernation purposes. Bat roosts initiated during construction are presumed to be unaffected, and no buffer is necessary. 31. No new grading or development shall be allowed within 20 feet of the edge of riparian vegetation or top of bank of Arroyo Mocho, whichever is further from the creek centerline, as delineated by a qualified, City- approved biologist that shall be hired by the applicant/developer. Prior to issuance of a building or grading permit, the biologist shall certify in writing to the Director of Community Development that the project is in compliance with this condition. 32. In the event that paleontological resources are encountered during the course of development, all construction activity must temporarily cease in the affected area(s) until the uncovered fossils are properly assessed by a qualified paleontologist and subsequent recommendations for appropriate documentation and conservation are evaluated and approved by the City of Pleasanton. Excavation or disturbance may continue in other areas of the site that are not reasonably suspected to overlie adjacent or additional paleontological resources. 5 of 28