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39 <br /> <br />b) If the proposed or existing land use or activity involves the storage of hazardous <br />substances or petroleum facilities, the buffer zone width shall also be adjusted to include an <br />additional one hundred and fifty (150) feet plus any additional distance required based on <br />the Slope-Width Table. <br />c) If the proposed or existing land use or activity involves animal feeding operations, the <br />buffer zone width shall also be adjusted to include an additional two hundred and fifty (250) <br />feet, plus any additional distance required based on the Slope-Width Table. <br />d) If the proposed or existing land use or activity involves solid waste landfills or junkyards, <br />the buffer zone width shall also be adjusted to include an additional three hundred (300) <br />feet, plus any additional distance required based on the Slope-Width Table. <br />4) Management of the vegetative buffer zone includes specific limitations on alteration of the <br />natural conditions pursuant to the minimal and limited disturbance zone setbacks of this <br />Ordinance. <br />5) Stream banks and other areas within the vegetative buffer zone must be left in a stabilized <br />condition upon completion of the development activities. The vegetative condition of the <br />entire streamside vegetative buffer zone must be monitored and landscaping or stabilization <br />performed to repair erosion, damaged or removed vegetation, bare ground, or other <br />problems identified. Only native riparian vegetation may be used in conjunction with <br />stabilization activities. <br />6) All vegetative buffer zones must be protected during development activities. Prior to the <br />initiation of development activities, ensure adequate visibility of the water quality buffer <br />zones by staking and flagging. Vegetative buffer zones, except vegetative buffer zones that are <br />completely within the limited or minimal disturbance zone setbacks, shall be surveyed and <br />iron pins set in the ground on side lots lines. <br />(g) Erosion and Sedimentation Requirements. <br />1) Purpose. In order to minimize erosion and sedimentation, certain requirements shall apply to <br />all sites disturbing one or more acres of land by grading or excavation. The following <br />standards are intended to ensure conformance with requirements established by the ND <br />Department of Environmental Quality. <br />2) No changes shall be made in the contour of the land; no grading, excavating, removal, or <br />destruction of topsoil, trees, or other vegetative cover of the land shall be commenced within <br />a proposed subdivision tract until such time that a plan for minimizing erosion and <br />sedimentation control has been reviewed by the Planning Commission and the County <br />Engineer. <br />3) The following measures are effective in minimizing erosion and sedimentation and shall be <br />included where applicable in the control plan using the ND Department of Transportation <br />Erosion and Sediment Control Handbook, as it presently exists or may hereafter be amended. <br />a) Stripping of vegetation and grading shall be kept to a minimum; <br />b) Development plans shall preserve significant natural features, cut and fill operations shall <br />be kept to a minimum and plans shall conform with the topography so as to create the least <br />erosion potential and adequately handle the volume and velocity of surface water runoff. <br />c) Whenever feasible, natural vegetation shall be retained, protected and supplemented.