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5. All instream work should ba performed during low water <br />periods and the use of heavy equipment, especially in flowing <br />waters, shall be conducted in a manner to prevent pollution and <br />release of contaminants, and to minimize turbidity and <br />sedimentation. The permittee is cautioned that excessively <br />turbid waters emanating from the excavation site may impact <br />aquatic life and downstream users. <br />6. An activity may not substantially disrupt the movement of <br />those species of aquatic life indigenous to the water body, <br />including those species which normally migrate through the area. <br />7. Unless otherwise authorized by the Corps of Engineers, all <br />dredged or excavated material from waters of the II.S. shall be <br />placed in an upland contained disposal site sufficiently removed <br />from waters of the United States to prevent re-entry of the <br />material to waters of the United States. <br />e. An activity into breeding areas for migratory waterfowl must <br />be avoided to the maximum extent practicable. <br />9. An excavation or dredging activity in waters of the United <br />States must be minimized or avoided to the maximum extent <br />practicable unless the District Engineer had approved a <br />compensation mitigation plan Por the specific regulated activity. <br />10. Destruction of riparian vegetation, especially mature <br />cottonwoods, and discharges into breeding areas !or migratory <br />waterfowl shall be avoided to the maximum extent practicable. <br />The permittee is cautioned that cottonwoods may be locally very <br />important for bald eagles which are protected by the Endangered <br />Species Act (refer to general condition number it below). <br />li. Any activity authorized under this permit shall not <br />jeopardize a listed species as identified under the Endangered <br />Species. Act, or destroy or adversely modify the critical habitat <br />of such species. The Corps of Engineers will contact the U.S. <br />Fish and Wildlife Service on specific requests to perform work <br />under this permit when a project "may affect" a threatened or <br />endangered species or their critical habitat. The U.S. Fish and <br />Wildlife Service will, in turn, develop a biological opinion <br />stating reasonable and prudent alternatives which avoid jeopardy <br />or adverse modification. For example, the following rivers in <br />western Colorado are designated as critical habitat for several <br />fish species protected by the Endangered Species Act: <br />a. The Yampa Siver from the Green River confluence to <br />Craig, Colorado; <br />r~ <br />LJ <br />6 <br />