Agenda - Council - 08/24/2010 - Laserfiche WebLink

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Land Alteration Grading, Fill, & Within the Shore Impact Zone (SIZ), grading and filling of >10 cubic yards of material and an area >250 square feet is Disturbance permitted only if a plan for erosion control, storm water management, and shoreline buffer restoration is approved by the within the Shore LGU and effectively implemented. Impact Zone (SIZ) Grading, Fill, & Fill, excavations, grading, and other land disturbing activities shall be prohibited in slope preservation zones with specified Disturbance exceptions.* prohibited in Slope Preservation Zone (SPZ) Erosion and sediment control technologies shall be required for any land disturbing activity that disturbs a total land surface area of 3,000 sq ft or more. Erosion & All technologies deployed shall be consistent with the latest Protecting Water Quality in Urban Areas Manual. Sediment . Temporary and permanent erosion and sediment control is required. Control Required * Development must be planned and conducted in a manner that will minimize the extent of disturbed areas, runoff velocities, erosion potential, and reduce and delay runoff volumes. Placement of rip rap, retaining walls, and sand blankets below the OHWL requires a DNR permit, and must comply with MN Rules 6115.0211, Subp. 5. Above the OHWL, placement or replacement of retaining walls, rip rap, or other impervious cover requires a permit from Rock Riprap & the LGU and must meet design, construction, and maintenance standards. LGU permit issuance is contingent upon the Retaining Walls existing or expected erosion problems precluding the use of bioengineering techniques. Rock riprap, boulder walls and retaining walls within the SIZ and SPZ shall only be used for the correction of an established erosion problem (as determined by a PE, and/or person with certification in erosion control) that cannot be controlled through the use of vegetation, slope stabilization using mulch, biomat, or similar bioengineered means. Riverbank No person shall install an improvement to prevent erosion or alteration of the riverbank of the Mississippi River, including Stabilization/ but not limited to a bioengineered installation, riprap, a retaining wall, a sand -blanket or a boat ramp, without first Alteration securing a permit. (Below the OHWL a DNR permit is required; above the OHWL a permit is required from the LGU.) Planting of vegetation does not require a permit. * Exceptions: extractive uses pursuant to part 6120.3300, subp. 9, and placement of stairways, chair lifts, and associated landings Shore Impact Zone (SIZ) = land located between the OHWL and a line parallel to it as % the required structure setback from the OHWL, but not less than 50'. The SIZ is 50' landward of the OHWL in agricultural areas. Slope Preservation Zones (SPZ) = land on and within 20 feet of bluffs and very steep slopes.