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� �5 <br /> p �C <br /> � Hy <br /> � �� � <br /> 'il H <br /> y� <br /> t+7 O <br /> H <br /> ON <br /> fl <br /> L��C] <br /> � y� � into the existing wetland at its lowest elevation to provide a <br /> Hy � biofiltrat`on/filter area. The areas at tlie outlets of the <br /> t7 y <br /> � y grass line swales will be planted with three-square bulrush <br /> � and spikerush to maximize the biofiltration of the water as it <br /> y enters into the site. <br /> HO� <br /> The entire buffer area will over-seeded with a grass mix <br /> � of redtop, meadow foxtail (native) , and Oregon bentgrass. <br /> This will provide soil stabilization and create a habitat for <br /> i small rodents . Once the area is planted, slips of black <br /> cottonwood and willow will be pluyged in between planted trees <br /> � to insure an increased densit to <br /> � y, provide a secondary tree <br /> age to compensate for trees that will die in the first 2 to 3 <br /> years after construction, and to provide a staggered age class <br /> in the woodlot area. <br /> � <br /> I The planting plan is_included_as L3 Landscape/Wetland <br /> � ' Mitigation Plan Drawing and Table 1. . � � " , , �% <br /> '_' �1' --- - � <br /> ' ' �� 8. Hydrology. � � <br /> The wetland area will receive storm/water runoff froni the J <br /> ��� j majority of the site. The water will be focused through three <br /> '�1 � grass-lined swales which will run along the upper edge of the <br /> mitigation wetland. The grass-lined swalPs will remove a <br /> ��� maj�r portion of any parking lot residues or sedimer,ts before <br /> �1 they enter into the wetland. All waters will pass through oil <br /> � separators prior to entering the grassland swales to reduce <br /> �,' the potential of oil and qrease reaching either the swale or <br /> � the wetlands mitigation area. <br /> � <br /> ' With the berm set at elevation 563 , the waters will enter <br /> the site filling the lower portions in the southern edge of <br /> '� the wetland first. As the water. increases in depth, it will <br /> �' back through and around the elevation 562 area creatinq an <br /> � irrigation system for the periphery of the buffer planting and <br /> for the trees in the elevation 564 and 565 areas. During <br /> periods of heavy rain , the waters will increase to depths <br /> greater than 563 and remain these until the water is metered <br /> o�t through the culvert under Casino Road. With the flooding <br /> and reduced rate of release, any sediments that may reach the <br /> 6 <br />