7200 HARDESON RD 2016-01-01 MF Import

y' C: I-1 �m� Qz� �� �� �g� G� Mo• Zy � M � M �� �� � C� �. � adequate root development, as is the case with revegetation. Bank stabiliry is accomplished by placing plant materials in a co�guration whereby the stems and trunks of cuttings '°' provide protection from erosion for streambanks and slopes. For this project, further short- term stabiliry (5 to 10 yeus) will be provided by the namral geotextile fabricx that have been included in the design. For more information on the proposed geutextile, see " Appendix B. Stream restoralion activities would be conducted in two phases. Each phase would "' be conducted in a two-step process. ,�. Phase „y During Phase 1 approximately 1,800 feet of the southernmost portion of the stream would be restored and relocated to a 60-foot corridor adjacent tu Hardeson Road. '�� Generally, this stream section would be moved only slightly from its present location. The ,,, project would extend slightly south of the property line to incorporate protection of the sewer line that has been exposed. In adJition, a temporary rock channel or culvert would � be built connecting the stream to an existing culvert at the upstream end of Phase 2. The �-. e�cisting culvert would be shortened by about ]00 feet to ease the angle with which the Phase , 1 rostoration meets the culvert. �+ The stream channel would be 10 feet wide and 2 feet deep and meander very slightly , within a zone IS feet in width (Figure 3). The overtlow channel varies in width depending upon the location within the project area. Figure 3 presents conditions typical for Phase 1 + of the project and Figure 4 shows conditions rypical in Phase 2. Portions of the channel in �� Phase 1 would be closer to Figure 4 in conGguration than Figure 3. t-t The corridor would be vegetated to form a thick stand of native vegetation that �� shades the stream, provides wildlife habitat, and mitigates wetland impacts. Trees, rather than shrubs are emphasized in the planting efforts to reduce the potential for decreazing � � channel conveyance capaciry. �� The channel gradient would be approximately 0.9 percent. Ncar the south property ' i line, the sewer line will be protected by placement of rock or construction of a structure. "� Wilsey & Ham will develop a design for that location. If the banks in this short reach are i to be lined with rock to resist erosion, joint planting with live stakes would be incorporated to establish vegetation (Figure 5). w � Step 1. Earthwork would be conducted prior to October 1990, during that period the channel should be dry. However, a temporary channel or culvert would be provided to �' convey stormwater during construction. Further, silt fences and other standard erosion , protection techniques would be implemented to reduce the potential for sedimentation of ,,� the new channel while restoration i� proceeding. �. �. , , .; ' o,;�� � c . ' _ �=%i��'. � s y ;;��-��'�� � ;._' j4��7�� . ;: ��::. ...