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� � H,� <br /> t" y59y3 <br /> HZM <br /> fC f] <br /> H:pU <br /> � H'i1 <br /> y� � <br /> � � . <br /> O �+ <br /> � �g <br /> �w ��j <br /> ryx ~ <br /> H y The grass lined swales will be constructed after the <br /> � y basic aite grading is completed. These will be incoporated in <br /> �y the same basic locations as the temporary interceptor (SD-1, <br /> SD-3 and SD-5� . <br /> �o� M <br /> That portion of the existing wetland east of Uuilding <br /> AB impacted by necessary clearing to provide construction <br /> room, but not permanently impacted by fill , will be restored <br /> with the same species of wetland plants removed or impacted <br /> '� duriny the building construction. <br /> The elevation 562 through 568 elevation areas be graded <br /> to the grade identified in the initial grading plan. The 561. <br /> area will be over-graded by 6 inches to elevation 560.5 to <br /> .� allow room for replacement soil from the northwest wetland. <br /> The permanent 561 area, after soil replacement will be 0.5 <br /> ( '�' feet above the invert of the ]2 inch C.M.P. pipe that will <br /> act as a metering device to allow the gradual discharge of <br /> I ��' water from the retention area . The emergency overflow <br /> '�' " standpipe will be at elevation 566 . 0 . This creates the <br /> potential of 5 + feet of water in the pond for 5-7 days. This <br /> ��� calculated discharge rate was designed to ( 1) provide the <br /> � necessary flood retention (2) create sediment collection in <br /> ' 1 the pond and (31 remove the water in a timely enough manner to <br /> ���� `" prevent drowning of the existing and created shrub/tree <br /> ' ' wetland components which are primarily facultati��e wet <br /> wetlands. The lowest portion of the wetland i.e. 6] .5 down <br /> � to 59.5 at the existing culvert outlet area will retain water <br /> until it either percolates into the ground or evaporates. ]t <br /> ��� � is anticipated that this time will vary over the first four <br /> �f years with the duration of standing water increasing as the <br /> � pond bottom seals and as the surrounding vegetation starts <br /> �� providing shade. <br /> '�' �� The elevation 564 and 565 areas will be cr.eated to <br /> maximize the conditions necessary for the survival of an <br /> alder/cottonwood tree community within the confines of the <br /> wetter portions of the mitigation area . <br /> `� The northwestern wetland will be excavaled using a front <br /> loader. The material , including plant life and mud sediments, <br /> will be excavated to a deptli of ] foot or to the point where <br /> 4 <br />