7200 HARDESON RD 2016-01-01 MF Import

� � � r� � � '' R The construction schedule is presented in Table 1. � � Step 1 w �f { C RII 4�j W �i � � � l�i , ia �9 � � Earthwork would be conducted prior ro October ]997; during that period the channel should be dry. A temporary channel or cvlvert would be provided, as necessary, • o convey stormwater during consttuction of the stream channel. Further, silt fences and other standard erosion protection techniques would be implemented to reduce the potential for sedimentation of the new channel while it is being restored. The stream channel would be excavated from the materials on-site, and topsoil would be added (and other amendments as needed depending on existing soil chemistry), as necessary, to the banks of the channel and the corridor, to provide a more suitable growing medium in reaches determined by the engineer. To require additional streambed stability, the bottom of the channel would be excavated to a depth that allows small gabions, quarry spall, or other erosion control measures to be pla:ed and covered with a natural substrate of stream gravel and cobbles at the appropriate grede. Quarry spall, small gabions, or other erosion control measures would aLso be placed about half way up the sides of the stream banks, as necessary. All areas will be seeded with grasses suitable for erosion control at the rate of 120 lbs/acre (Table 1). A natural 8ber geotextile (made of coir or similar material) would be placed on the upper portion of the side slopes of the channel over the grass seed (Figure 3). Upslope of the co'v fabric installation, jute matting would be placed over straw to provide side-slope stability and erosion protection within the overflow channel. Table 2 presents the treatments proposed for different zones of the cross sections depicted in Figures 3 and 4. Quarry spall, gabions, or other erosion control measures would be used to protect and provide a transition at the upstream and downstream end of the box cviverts. Step 2 �!"� The second step of the project would be to install the bioengineering teatures and add � other vegetation. The primary bioengineering features used for bank protection are expected � to be live stakes and fascines. Live stakes are a cvtHng, typically of willow, that is tamped into the ground in a pattem that creates a dense mat of roots. Live fascines are bundles of cuttings that are placed horizontally in a dug trench next to the stteam. The fascines sprout ' � and form a very dense mat of roots. These types of insWllations are typically conducted � during the fall and winter when the plant materials are in their dormant state. I� i�1 na �e � $