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program, a voluntary program that encourages local governments to adopt higher development <br />standards for storm water management. <br />• "Storm water management facility" is any facility that collects, conveys, treats or disposes of <br />storm water. This definition is consistent with the Minnesota Stormwater Manual. <br />Subpart3. Land alteration. Because of the importance and sensitivity of both the bluff impact zone and <br />the water quality impact zone, this subpart establishes standards for their ongoing protection. <br />Bluff Impact Zones. Bluffs are especially susceptible to erosion and potential failure (see pages 22 <br />to 28 on bluffs). Prohibiting land alteration activities that could destabilize bluffs reduces erosion <br />risks and helps protects public bluffs from slumping or failure. Thus, Supb. 3.A. prohibits all land <br />alteration activity in the bluff impact zone except as authorized by local permit. Permissible <br />exceptions are limited to those activities, approved by local government or the appropriate resource <br />agency, necessary for erosion control management or for the repair and maintenance of existing <br />structures. <br />Water Quality Impact Zones. Land alterations, as defined, particularly within the water quality <br />impact zone, have the potential to increase sedimentation and nutrient pollution in adjacent water <br />bodies. This subpart is intended to prevent or decrease sediment and nutrient pollution within the <br />MRCCA due to land alteration by using a permitting process and best management practices. <br />Subpart 3.B. requires a local permit for activities in the water quality impact zone involving the <br />alteration of more than 10 cubic yards of materials or an alteration of an area greater than 1,000 <br />square feet. Activities in the water quality impact zone within the MRCCA are not currently <br />regulated by most local governments. This permit requirement gives local government oversight <br />over alteration activities, requires the use of best management practices, and thus reduces risks of <br />erosion and water pollution. The 1,000 square foot threshold adopted in the rule is consistent with <br />standards applied by the Capitol Region Watershed District. <br />Subpart 4. Rock riprap, retaining walls, and other erosion control structures. In -stream and <br />streambank erosion control structures such as riprap and retaining walls can positively reduce the <br />impacts of erosion, but these structures may also negatively impact stream and bank habitat in certain <br />situations. Therefore, subpart 4 allows these structures in the bluff impact and water quality impact <br />zones only with a permit issued by a local government and with DNR approval for work in public waters <br />as set forth in Minn. R. 6115.0190 through 6115.0255 (2015). This subpart further specifies that these <br />structures may only be used to correct an existing erosion problem and limits the size of the structures <br />to the minimum needed to correct the problem. Structures larger than the specified dimensional limits <br />are allowed only if an engineer determines that a larger structure is needed to correct the erosion <br />problem. This issue drew extensive public comments, especially in the Coon Rapids Pool area. These <br />standards acknowledge a need for riprap to address erosion in this area but places limits on the size of <br />structures. <br />Subpart 5. Permit process. This subpart sets out procedures for obtaining a local permit for erosion <br />control structures that local governments are required to adopt. The process parallels the process for <br />obtaining a vegetation management permit set forth in proposed Minn. R. 6106.0150, subp. 4. <br />60 <br />