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preservation zone is prohibited except as provided in Table <br />1. <br />B. Permit conditions. Temporary and permanent erosion and <br />sediment control measures must be sufficient to retain <br />sediment onsite consistent with established best management <br />practices. <br />require BMPs for disturbances greater than <br />1,000 square feet within 500 feet of water.) <br />Land disturbance is prohibited in the bluff <br />impact zone and the slope preservation zone, <br />subject to some exceptions (see Table 1). <br />Subpart 8. Rock riprap and retaining walls. <br />A. Within shore impact zones, bluff impact zones, and slope <br />preservation zones, construction or replacement of retaining <br />walls, riprap, or other impervious surfaces, or use of <br />bioengineering techniques must meet the following <br />requirements: <br />(1) except as provided under item B, retaining walls, riprap, or <br />other erosion control structures must only be used for the <br />correction of an established erosion problem that cannot be <br />controlled through the use of vegetation, slope stabilization <br />using mulch, a biomat, or similar bioengineering methods. <br />This determination must be done by a qualified person as <br />determined by the local government; <br />(2) design, construction, and maintenance must be consistent <br />with best management practices in Protecting Water Quality <br />in Urban Areas Manual, incorporated by reference under <br />part 6106.0090, or other appropriate resource agency <br />manual; and <br />(3) placement of riprap or retaining walls below the ordinary <br />high water level requires a permit from the commissioner <br />and must comply with chapter 6115. <br />B. In the CA -UC district, bluffs that have been structurally altered <br />and /or structurally reinforced may continue to be reinforced, <br />consistent with the best management practices specified in item <br />A(2). <br />Item B addresses existing reinforced bluffs in <br />urban areas — i.e., downtown St. Paul. <br />Subpart 9. Development on steep slopes A local government may <br />allow structures, impervious surfaces, land alteration, vegetation <br />removal, or construction activities on steep slopes when the following <br />conditions are met: <br />A. The applicant can demonstrate that the development can be <br />accomplished without increasing erosion or storm water runoff; <br />B. The soil types and geology are suitable for the proposed <br />development; and <br />C. Vegetation is managed according to the requirements of this <br />part. <br />Steep slopes are defined as slopes between <br />12% and 18 %. <br />Vegetation removal standards in this part <br />apply if the steep slopes include native plant <br />communities, tree canopies or significant <br />vegetative stands identified in local <br />governments' adopted plans. <br />Subpart 10. Compliance with other plans and programs. All <br />development must: <br />A. be consistent with Minnesota Statutes, chapter 103B, and local <br />water management plans completed under chapter 8410; <br />Working Draft Rules <br />MRCCA Working Draft Rules — DNR, June 2, 2014 <br />36 <br />Commentary /Rationale for Changes <br />