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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 a. Construction,repair,or replacement of rock riprap, retaining walls,and other erosion control <br /> 810 structures located at or below the OHWL must comply with Minnesota Rules,chapters <br /> 811 6115.0215,subpart 4,item E,and 6115.0216,subpart 2.Work must not proceed until approved <br /> 812 by the commissioner.See Figure 8. <br /> 813 <br /> 814 Figure 8. Riprap Guidelines <br /> Riprap Guidelines • <br /> Above OHWL get local Below ORWL:gm D R <br /> government unit permit i pergag permission <br /> Regulatory <br /> flood OHM. <br /> protection <br /> elevation —a <br /> Ricer_ <br /> Fitter <br /> 3 <br /> Finished siege below OHWL must <br /> be less than a',:3 ratio <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 /> 23 <br />