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Notification #1600- 2013- 0356•R3 Streambed Alteration Agreement Page 9 of 23 Exhibit A -1 diverted through a suitably sized pipe, from upstream of the upstream coffer dam and discharged downstream of the downstream coffer dam, Coffer dams shall be constructed of a non - erodible material which does not contain soil or fine sediment. Coffer dams and the stream diversion system shall remain in place and functional throughout the construction period. If, the coffer dams or stream diversion fail, they shall be repaired immediately. Normal flow shall be restored to the affected stream immediately upon completion of work at that location. 2.15 Water Surface Elevation. Flows to downstream reaches shall mimic natural flow patterns. Said flows shall be of sufficient quality and quantity and appropriate temperature to support fish and other aquatic life both above and below the diversion structure. During dewatering of the channel, the decrease in water surface elevation (WSE) shall be controlled such that WSE does not change at a rate that increases turbidity to the creek that could be deleterious to aquatic life and the likelihood of stranding aquatic life up- and downstream of the creek. 2.16 Check for Stranded Aquatic Life. The biological monitor shall check daily for stranded aquatic life as the water level in the dewatering area drops. All reasonable efforts shall be made to capture and move all stranded aquatic life observed in the dewatered areas. Capture methods may include fish landing nets, dip nets, buckets and by hand. Captured aquatic life shall be released immediately in the closest body of water adjacent to the work site. This measure does not allow for the take or disturbance of any State or federally listed species. 2.17 Designation of Work Area. Prior to project activities, a biological monitor shall clearly mark/flag or erect temporary construction fencing to designate the work area and to delineate the areas that shall be avoided. The biological monitor shall clearly mark/flag all trees within the designated work area that shall be avoided. Flagging and or temporary construction fencing shall be removed immediately after the completion of construction work. 2.18 Trimming of Vegetation. Trimming is defined herein as the removal of vegetation to the extent necessary to allow a specific level of access and for specific types of equipment (e.g. crane, clambucket) or to restore normal streamflow. There shall be no vegetation removal in excess of what is necessary to allow the level of access needed or to restore normal streamflow. Trees, shrubs and emergent wetland plants may be removed from natural channels if they are below ordinary high water (OHW) and are restricting the Page 18 of 34 ATTY /AGR /2018.243/CITY OF MENLO PARK_ATHERTON CHANNEL GSA