28-14 Amend Chp. 1339 Storm Water Mgmt

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(3) The construction site conservation plan shall include the scheduling, phasing and coordination of construction operations and erosion and sediment control BMPs, including vegetative plantings and mulch. (4) The construction site conservation plan shall include a description of the stonn water management (SWM) practices to be used on the site. The SWM element of the plan shall include, at a minimum, the follow- ing: A. A map showing the location, drawn to scale, of permanent SWM conveyance, detention and retention structures, other SWM con- trol structures and the SWM easements. B. A general description of the SWM strategy proposed to meet this regulation. C. Design calculations for all permanent SWM conveyance, deten- tion and retention structures, and other SWM control structures. D. Any other SWM related items required by the city engineer. 1339.10 CONSTRUCTION MINIMUM STANDARDS. In order to control sediment pollution of water resources, the owner or person responsible for the development area shall use conservation planning and prac- tices to maintain the level of conservation established in the following standards. The permittee must adhere to all requirements of the EPA construction general permit. In addition, the following items are general guidelines and shall not lim- it the right of the city engineer to impose at any time additional, more stringent requirements, nor shall the guidelines limit the right of the city engineer to waive, in writing, individual requirements. (a) The plan shall include measures that control the flow of runoff from dis- turbed areas so as to prevent soil erosion from occurring. (b) Structural practices shall be used to control erosion and trap sediment from areas remaining disturbed for more than 21 days. (c) Sediment Barriers: Sheet flow runoff from denuded areas shall be intercept- ed by silt fence or diversions to protect adjacent properties and water re- sources from sediment. Where intended to provide sediment control, silt fence shall be placed on a level contour. The relationship between the max- imum drainage areas to silt fence for a particular slope is shown in the table below: Table 1: Silt Fence Applicability Maximum drainage area (in acres) to 100 linear feet of Silt Fence Range of slope for a particular drainage area (in percent) 0.5 <2% 0.25 > 2% but < 20% 0.125 >20% but < 50% 41