(A) Erosion control shall be practiced whenever a parcel is cleared, graded or otherwise disturbed by the movement of earth, regardless of exemptions outlined in § 151.02(B). At a minimum, erosion control standards shall be consistent with the technical requirements set forth in the Ohio EPA NPDES General Stormwater Permit for Construction Activities (OHC000005 or latest version). The following principles are effective in minimizing erosion and sedimentation and shall be included where applicable in the Stormwater Management Plan:
(1) Stripping of vegetation, regrading or other development shall be done in such 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) (a) Provisions shall be utilized in the design to minimize changes to the surface conditions which increase the percentage of impervious surface.
(b) Provisions shall be made to effectively mitigate the increased runoff rates caused by changed soil and surface conditions in addition to addressing water quality measures during and after development. Where necessary, Detention/ Retention Basins shall be provided according to the requirements of this chapter as well as water quality measures.
(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 the Stormwater Management Plan;
(1) All lots, tracts, or parcels shall be graded to provide proper drainage away from the building and dispose of it without ponding. Each lot shall be graded such that water from the lot drains to a natural stream, swale, storm sewers or other watercourse. New stormwater outfalls shall not discharge undetained and/or untreated stormwater into jurisdictional wetlands, aquifers, or sensitive areas.
(2) All drainage provisions shall be of such design to adequately convey quantity and preserve quality of the surface runoff.
(3) Concentration of surface water runoff shall only be permitted in swales or watercourses;
(4) The installation of the specific Stormwater Management Plan measures shall be accomplished in accordance with the standards and specifications contained in the following:
(a) City Regulations;
(b) The latest edition of the ODNR Rainwater and Land Development Manual;
(c) The latest edition of the ODOT Location and Design Manual - Volume 2 - Drainage Design;
(d) The Ohio EPA NPDES General Stormwater Permit for Construction Activities (OHC000005 or latest version).
(5) The installation of post construction best management practices shall be accomplished in accordance with the standards and specifications contained in the City Regulations. Acceptable post construction best management practices are those that are included in the Ohio EPA NPDES General Storm Water Permit for Construction Activities (OHC000005 or latest version).
(6) The Building Department shall enforce compliance with the approved plans.
(C) The approved Stormwater Management Plan required of the landowner or his 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, steep excavations, post construction stormwater quality best management practices, and other protective measures to be constructed in connection with, or as a part of the proposed work;
(8) Provisions for maintenance of control facilities and other measures (including easements) to insure short as well as long term Erosion Prevention, Sediment Control, and general water quality treatment.
(9) Maintenance methods and schedule for post-construction stormwater quality best management practices shall be provided. An Operation and Maintenance Plan shall be submitted outlining a plan for inspection and maintenance of Post-Construction Water Quality BMP(s).
(10) 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 criteria as outlined in this chapter.
(11) The estimated cost of all the required Water Management and Sediment Control items.
(Ord. 25-1987, passed 3-18-87; Am. Ord. 77-1996, passed 10-16-96; Am. Ord. 40-2010, passed 12-15-10; Am. Ord. 29-2012, passed 9-5-12; Am. Ord. 21-2023, passed 4-19-23)