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SPECIFICATION - 391-6 <br />Buffer vegetation may help stabilize <br />concentrated flow erosion but <br />additional up-gradient treatment <br />is necessary <br />Erosion must be controlled in <br />the area up-gradient <br />from Zone 2 <br />Concentrated <br />Flow Erosion <br />Zone 2 <br />Zone 3 <br />Figure 3. Control of concentrated flow erosion <br />Additional Requirements To Provide Habitat For Aquatic Organisms And Terrestrial Wildlife <br />The width of Zone 1 and/or Zone 2 will be expanded to meet the minimum requirements of the wildlife <br />or aquatic species and associated communities of concern according to the following: <br />Species <br />Desired Width in Feet <br />Bald eagle, cavity nesting ducks, heron rookery, <br />sandhill crane 600 <br />Swainson's thrush, yellow-billed cuckoo 450 <br />Beaver, dabbling ducks, mink, salmonids 300 <br />Deer 200 <br />Frog, salamander 100 <br />A buffer for lowering warm-season water temperatures shall consist of at least zone 1 for water course <br />reaches or water bodies less than or equal to 30 feet in width or water bodies greater than 30 feet <br />wide but less than 1 acre. To lower water temperatures, buffers shall be established or maintained on <br />south and west sides of water courses and bodies as practical. The buffer canopy will be established <br />to achieve at least 50 percent crown cover with average canopy heights equal to or greater than the <br />width of the water course or 30 feet for water bodies. See figure 4. <br />NRCS,CO <br />AUGUST, 2006