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791 c. A certificate of compliance will be issued after the vegetation restoration plan requirements have <br />792 been satisfied. <br />793 <br />794 (j) LAND ALTERATION STANDARDS AND STORMWATER MANAGEMENT <br />795 1. Purpose. To establish standards that protect water quality from pollutant loadings of sediment, <br />796 nutrients, bacteria, and other contaminants; and maintain stability of bluffs, shorelines, and other areas <br />797 prone to erosion. <br />798 2. Land alteration permit. <br />799 a. Within the bluff impact zone, land alteration is prohibited, except for the following which are <br />800 allowed by permit. <br />801 (1) Erosion control consistent with Section 117-148(j)6 (Conditions of land alteration permit <br />802 approval); <br />803 (2) The minimum necessary for development that is allowed as an exception under Section 117- <br />804 148(1) (Exemptions); and <br />805 (3) Repair and maintenance of existing buildings and facilities. <br />806 b. Within the water quality impact zone, land alteration that involves more than ten cubic yards of <br />807 material or affects an area greater than 1,000 square feet requires a permit. <br />808 3. Rock riprap, retaining walls, and other erosion control structures. <br />809 <br />810 <br />811 <br />812 <br />813 <br />814 <br />815 <br />816 b. Construction or replacement of rock riprap, retaining walls, and other erosion control structures <br />817 within the bluff impact zone and the water quality impact zone are allowed with a permit <br />818 consistent with provisions of Section 117-148(j)6 (Conditions of land alteration permit approval) <br />819 provided that: <br />a. Construction, repair, or replacement of rock riprap, retaining walls, and other erosion control <br />structures located at or below the OHWL must comply with Minnesota Rules, chapters <br />6115.0215, subpart 4, item E, and 6115.0216, subpart 2. Work must not proceed until approved <br />by the commissioner. See Figure 8. <br />Figure 8. Riprap Guidelines <br />Riprap Guidelines <br />Above OHWL: get Local Below OHWL: get DNR <br />government unit permit permit or permission <br />Regulatory <br />flood <br />protection <br />elevation <br />OHWL <br />River <br />Filter <br />1 <br />3 <br />Finished slope below OHWL must <br />be less than a 1:3 ratio <br />23 <br />