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D. Using sediment traps, vegetated buffer strips or other appropriate techniques; 679 <br />E. Stabilizing altered areas to acceptable erosion control standards consistent with the 680 <br />field office technical guides of the soil and water conservation district; 681 <br />F. Not placing fill or excavated material in a manner that creates unstable slopes. Plans 682 <br />to place fill or excavated material on steep slopes must be reviewed by qualified 683 <br />professionals for continued slope stability and must not create finished slopes of 30 684 <br />percent or greater; 685 <br />G. Fill or excavated material must not be placed in bluff impact zones; 686 <br />H. Any alterations below the ordinary high water level of public waters must first be 687 <br />authorized by the commissioner under Minnesota Statutes, Section 103G; 688 <br />I. Alterations of topography are only allowed if they are accessory to permitted or 689 <br />conditional uses and do not adversely affect adjacent or nearby properties; and 690 <br />J. Placement of natural rock riprap, including associated grading of the shoreline and 691 <br />placement of a filter blanket, is permitted if: 692 <br />a. the finished slope does not exceed three feet horizontal to one-foot vertical; 693 <br />b. the landward extent of the riprap is within ten feet of the ordinary high water 694 <br />level; and 695 <br />c. the height of the riprap above the ordinary high water level does not exceed three 696 <br />feet (see Figure 1012-9). 697 <br />Figure 1012-9: Riprap Guidelines 698 <br />d. Connections to public waters. Excavations to connect boat slips, canals, lagoons, and harbors 699 <br />to public waters require a public waters permit and must comply with Minnesota Rules, 700 <br />Chapter 6115. 701 <br />RCA Attachment A <br />Page 24 of 32