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.1 GO!)t;~~ . c. The smallest practical increment of land shall be exposed at anyone time during development; d. When soil is exposed, the exposure shall be for the shortest feasible period of time; e. Where the topsoil is removed, sufficient aerable soil shall be set aside for respreading over the developed area. The soil shall be restored to a quality at least equal to the soil quality prior to development; f. Critical erosion areas exposed during construction shall be protected with temporary vegetation, mulching or other acceptable means; g. Sediment basins (debris basins, desilting basins, or silt traps) shall be installed and maintained to remove sediment from runoff waters from land subject to earth disturbance activities; h. Diversions shall be installed to divert surface water runoff from slopes of ten percent (10%) or steeper; i. Provisions shall be made to effectively accommodate increased runoff caused by changed soil and surface conditions during and after development; j. Cut and fill slopes shall not be steeper than three feet horizontal to one foot vertical (3:1) unless stabilized by a retaining wall, riprap, or other acceptable means; and . k. During grading operations, necessary measures for dust control, as required by the City, shall be implemented. 9. Drainage. The natural drainage system shall be used to the maximum extent feasible for the storage and flow of runoff. The design of the drainage system shall conform to the City's overall storm water management plan. The following requirements shall also apply: a. Proposed drainage facilities shall have adequate capacity to accommodate potential runoff from their entire upstream drainage area, whether within or without the subdivision. The effect of the subdivision on existing downstream drainage areas outside the subdivision shall be considered in evaluating the adequacy of the storm water management plan; b. Storm water runoff shall be discharged to marsh lands, swamps, retention basins or other treatment facilities. Marsh lands and swamps used for storm water shall provide for natural or artificial water level control; c. No existing ditch, stream, drain or drainage canal shall be deepened, widened, rerouted or filled without review and approval by the City; . d. Where artificial channels must be constructed to augment the natural drainage system, such channels as well as the natural drainage ways may be planned as part of a recreational trail system. Channels shall be designed to be aesthetically compatible for recreational trail use; e. Quality of storm water runoff and water infiltrated to the water table 18.