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D. Using sediment traps vegetated buffer strips or other appropriate techniques; E. Stabilizing altered areas to acceptable erosion control standards consistent with the field office technical guides of the soil and water conservation district; F. Not placing fill or excavated material in a manner that creates unstable slopes Plans to place fill or excavated material on steep slopes must be reviewed by qualified professionals for continued slope stability and must not create fmished slopes of 30 percent or greater; G. Fill or excavated material must not be placed in bluff impact zones,• H. Any alterations below the ordinary high water level of public waters must first be authorized by the commissioner under Minnesota Statutes, Section 103G• I. Alterations of topoogrraphy are only allowed if they are accessory to permitted or conditional uses and do not adversely affect adjacent or nearby properties; and J. Placement of natural rock riprap, including associated grading of the shoreline and placement of a filter blanket, is permitted if a. the finished slope does not exceed three feet horizontal to one -foot vertical; b. the landward extent of the riprap is within ten feet of the ordinary high water level; and c. the height of the riprap above the ordinaa high water level does not exceed three feet (see Figure 1012-9). Figure 1012-9: Riprap Guidelines <3 ft above OHWL Riprap Guidelines Above OHWL: get local government unit permit <10 ft horizontal distance from OHWL Below OHWL: get DNR permit or permission OHWL _..._ _ Water Filter�;- 1 :3 Finished slope below OHWL ITIM he less than a 1:3 ratio d. Connections to public waters. Excavations to connect boat slips canals lagoons and harbors to public waters require a public waters permit and must comply with Minnesota Rules Chapter 6115.