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825 1. Purpose. To establish standards that protect water quality from pollutant loadings of sediment, <br />826 nutrients, bacteria, and other contaminants; and maintain stability of bluffs, shorelines, and other areas <br />827 prone to erosion. <br />828 2. Land alteration permit. <br />829 a. Within the bluff impact zone, land alteration is prohibited, except for the following which are <br />830 allowed by permit. <br />831 (1) Erosion control consistent with Section 117-148(j)6 (Conditions of land alteration permit <br />832 approval); <br />833 (2) The minimum necessary for development that is allowed as an exception under Section 117- <br />834 148(I) (Exemptions); and <br />835 (3) Repair and maintenance of existing buildings and facilities. <br />836 b. Within the water quality impact zone, land alteration that involves more than ten cubic yards of <br />837 material or affects an area greater than 1,000 square feet requires a permit. <br />838 3. Rock riprap, retaining walls, and other erosion control structures. <br />839 a. Construction, repair, or replacement of rock riprap, retaining walls, and other erosion control <br />840 structures located at or below the OHWL must comply with Minnesota Rules, chapters <br />841 6115.0215, subpart 4, item E, and 6115.0216, subpart 2. Work must not proceed until approved <br />842 by the commissioner. See Figure 8. <br />843 <br />844 Figure 8. Riprap Guidelines <br />845 <br />846 <br />847 <br />848 <br />849 <br />850 <br />851 <br />852 <br />853 <br />Riprap Guidelines <br />Above OHWL: get local Below OHWL: get DNR <br />government unit permit permit or permission <br />Regulatory -- - - - - - - - - - - -- <br />--------------- - <br />flood OHWL <br />protection <br />elevation - - - - - - -,•���� � �� <br />River <br />Filter ~ V - <br />1 <br />3 <br />Finished slope below OHWL mint <br />be less than a 1:3 ratio <br />b. Construction or replacement of rock riprap, retaining walls, and other erosion control structures <br />within the bluff impact zone and the water quality impact zone are allowed with a permit <br />consistent with provisions of Section 117-148(j)6 (Conditions of land alteration permit approval) <br />provided that: <br />(1) If the project includes work at or below the OHWL, the commissioner has already approved <br />or permitted the project. <br />(2) The structures are used only to correct an established erosion problem as determined by the <br />City of Ramsey. <br />24 12/30/2020 <br />