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(12) Establishment of Permanent Vegetation. A permanent <br />vegetation cover shall be established on denuded areas <br />not otherwise permanently stabilized. <br />Permanent vegetation shall not be considered established <br />until ground cover is achieved which, in the opinion of <br />the City Engineer, provides adequate cover and is mature <br />enough to control soil erosion satisfactorily and to <br />survive adverse weather conditions. <br />(13) Disposition of Temporary Practices. All temporary and <br />permanent erosion and sediment control practices shall be <br />disposed of within thirty (30) days after final site <br />stabilization is achieved or after the temporary practices <br />are no longer needed, unless otherwise authorized by the <br />Engineering Division. Trapped sediment shall be <br />permanently stabilized to prevent further erosion. <br />(14) Maintenance. All temporary and permanent erosion and <br />sediment control practices and facilities shall be <br />maintained and repaired by the owner or person in charge <br />of the parcel of land on which such facilities are located <br />as needed to assure continued performance of their <br />intended function. <br />(15) Special Provision. Standard Number (5), Storm Sewer <br />Inlet Protection, and Standard Number (7), Construction <br />Access Routes, apply to all earth-disturbing-activity <br />regardless of lot size. <br />927.06 STORMWATER CHANNEL EROSION CONTROL STANDARDS <br />(a) In order to control channel erosion caused by increased <br />stormwater runoff rates and volumes, stormwater runoff from development <br />areas shall be restricted. This provision shall apply to all new <br />construction and redevelopment on lots larger than 8,000 square feet, <br />and for all additions on lots larger than one-half acre. <br />(b) The peak rates of runoff after development shall be no greater <br />than ninety (90%) percent of the peak rates of runoff occurring before <br />any development for all twenty-four hour storms from one to one hundred <br />year frequency. If this requirement is satisfied for the one, two, <br />five, ten, twenty-five, fifty and one hundred year frequency storms, all <br />storms from one to one hundred year frequency may be assumed to satisfy <br />this requirement. <br />Page-17- <br />