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08? Finding The following measure has been incorporated into the project which, if properly implemented, will avoid or substantially lessen potential effects on the floodplains and floodway within the project area, to a level of insignificance. Routine construction procedures will be implemented to minimize impacts to the floodplains. With regard to the bridge over Santiago Creek, the design will consider the possibility of the creek overtopping its banks and will be designed in accordance with Federal Emergency Management Agency requirements to withstand such an episode. Rationale The risks associated with the Santa Ana River floodplain at the southerly periphery of the project area and the Santiago Creek are minimal. The widening of the Santiago Creek Bridge would entail very minor encroachments into the creek, which will not affect the floodway as long as the existing bridge elevation is maintained. The proposed project would not be a longitudinal encroachment into either of the two floodplains and would not contribute to incompatible floodplain developmentl and would have no significant impacts on natural and beneficial floodplain values, including biological resources. P. Streambed Modification Significant Effects Construction of a widened bridge section within Santiago Creek, could result in the removal of several ornamental trees found along the roadway shoulders, adjacent to the bridge. No wetlands resources are found within the streambed. Some disturbance of non-significant streambed vegetation and wildlife may occur and vegetation/wildlife supporting water flow could be interrupted. Finding The following measures have be[n incorporated into the project which, if properly implemented, would avoid or substantially lessen streambed modification effects to a level of insignificance. Replacement of trees will occur on those roadway shoulders without surviving trees.