(a) The following principles are effective in minimizing erosion and sedimentation and shall be included where applicable in the Water Management and Sediment Control Plan:
(1) Stripping of vegetation, regrading or other development shall be done in a way that will minimize erosion. Whenever feasible, natural vegetation shall be retained, protected and supplemented;
(2) Development plans shall preserve salient natural features, keep cut-fill operations to a minimum, and ensure conformity with topography so as to create the least erosion potential;
(3) The smallest practical area of land shall be exposed at any one time and the duration of exposure shall be kept to a practical minimum. The topsoil shall be preserved and returned to the surface of areas to be revegetated, or new topsoil will be provided, or the surface shall be covered with sod;
(4) Disturbed soils shall be stabilized as quickly as practical with temporary vegetation or mulching to protect exposed critical areas during development;
(5) The permanent final vegetation and structural erosion control and drainage measures shall be installed as soon as practical in the development;
(6) Provisions shall be made to effectively accommodate the increased runoff caused by changed soil and surface conditions during and after development. Where necessary, detention/retention basins shall be provided according to the requirements of this chapter; and
(7) Sediment in the runoff water shall be trapped by the use of debris basins, sediment basins, silt traps or similar measures until the disturbed area is stabilized.
(b) The following standards shall be followed in preparing Water Management and Sediment Control Plans:
(1) All lots, tracts or parcels shall be graded to provide proper drainage away from the building and dispose of it without ponding except as provided herein. Each lot shall be graded so that water from the lot drains to a natural stream, swale, storm sewers or other watercourse;
(2) All drainage provisions shall be of the design to adequately handle the surface runoff;
(3) Concentration of surface water runoff shall only be permitted in swales or watercourses;
(4) The installation of the specific water management and sediment control measures shall be accomplished in accordance with the standards and specifications contained in the and the current edition of the Stormwater Manual and the SWCD;
(5) During the construction phase, further consultive technical assistance will be furnished, if necessary by the City Engineer or by the SWCD; and
(6) The Building Department shall enforce compliance with the approved plans.
(c) The approved Water Management and Sediment Control Plan required of the landowner or his or her agent shall include, but not be restricted to the following:
(1) A vicinity sketch and boundary line survey of the project area;
(2) Location of all existing buildings, structures, utilities, storm and sanitary sewers and waterlines in the project area;
(3) Location of all trees with a trunk diameter of greater than six inches measured at a point five feet from the ground or a report on the trees in a form acceptable to the city from an arboriculturist certified by the city. If there are no trees, a note so stating shall be placed on the plans;
(4) Location of any building or structure, on land of adjacent property owners, within 100 feet of the project area;
(5) Elevations, contours, dimensions, locations and extent of all work proposed to be done within and outside the project area, the existing elevations and contours of the land all in increments of two feet, and soil type and proposed ground cover for areas not covered by buildings, structures or pavement;
(6) A certification of the quantity of cut and fill involved;
(7) Detailed plans of all proposed stormwater provisions, retaining walls, vegetative practices, erosion and sediment control measures, location of fences around sediment basins, detention/retention basins or steep excavations and other protective devices to be constructed in connection with, or as a part of the proposed work;
(8) Provisions for maintenance of control facilities including easements to ensure short as well as long term erosion and sediment control;
(9) A map showing the drainage area of land tributary to the project area and estimated runoff of the area served by any drainage structure or watercourse, computed in accordance with the current edition of the Mason Stormwater Manual;
(10) The estimated cost of all the required water management and sediment control items.
(Ord. 99-207, passed 1-10-2000)