Agenda - 10-05-1987 - Laserfiche WebLink

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ORAL AGE COLI'( FT S ION CONTPOL o pIVEE 7 � c. Limit Time of Exposure - all land-disturbing activities are to be ,`�2;j planned and conducted to limit exposure to the shortest feasible time. d. Control Surface Water - surface water runoff originating upgrade of exposed areas should be controlled to reduce erosion and sediment loss during the period of exposure. e. Control Sedimentation - all land-disturbing activities are to be planned and conducted so as to prevent off- site sedimentation damage. f. Manage Storm Water Runoff when the increase in the peak rates and velocity dl storm water runoff resulting from a land-disturbing activity is sufficient to cause accelerated erosion of the receiving watercourse, plans are to include measures to control the velocity and the rate of release at the point of discharge so as to minimize accelerated erosion of the site and increased sedimentation of the stream. Section 8 Mandatory Standards for Land-Disturbing Activity No land-disturbing activity subject to the control of this ordinance shall be undertaken except in accordance with the following mandatory standards: a. Buffer Zone - no land-disturbing activity shall be permitted in proximity to a lake or natural watercourse unless a buffer zone is provided along the margin of the watercourse of sufficient width to confine visible siltation within the twenty-five percent (25%) of the buffer zone nearer the land-disturbing activity, provided that this subsection (a) shall not apply to a land-disturbing activity in connection with the construction of facilities to be located on, over, or under a lake or natural watercourse. b. Graded Slopes and Fills - the angle for graded slopes and fills shall be no greater than the angle which can be retained by vegetative cover or other adequate erosion control devices or structures. In any event, slopes left exposed will within 30 working days of completion of any phase of grading, be planted or otherwise provided with ground cover, devices, or structures sufficient to restrain erosion. c. Ground Cover - whenever land-disturbing activity is undertaken on a tract comprising more than 20,000 square feet, if more than 20,00000 contiguous square feet are uncovered, the person conducting the land disturbing activity shall install such sedimentation and erosion control devices and practices as are sufficient to retain the sediment enerated by the land-disturbing activity within the boundaries of the tract during construction upon and development of said tract? and shall lant or otherwise provide a permanent ground cover sufficient to restrain erosion after completion of construction or development within 30 working days or 120 calendar days following completion, whichever period is shorter. d. Design and Performance of Control Measures - Erosion and sedimentation control measures, structures, and devices shall be so planned, designed and constructed as to provide protection from accelerated erosion and sedimentation from the calculated maximum peak rates of runoff from the ten-year frequency storm. Runoff rates shall be calculated using the procedures in the USDA Soil Conservation Service's "National Engineering Field Manual for Conservation Practices " or other calculation procedures acceptable to the Erosion Control Officer. e. Prior Plan Approval - No person shall initiate any land-disturbing activity if more than 20,000 square feet are to be uncovered unless thirty or more days prior to initiating the activity, an erosion and sedimentation control plan for such activity is filed with, approved by, and a Grading Permit obtained from the County. Section 8.1 Additional Standards for Land-Disturbing Activity in University Lake Watershed The provisions of Section 8 shall apply to land-disturbing activity within the University Lake Watershed. In addition, the design, construction, and maintenance of drainage systems in developments within the University Lake Watershed shall also be consistent with the following standards? and these standards shall control to the extent that they are more restrictive than those set forth in Section 8.