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(12) Steep slopes where areas of 12% or more existing over a <br />distance for 50 feet or more. <br />(13) Location of temporary sedimentation basins - If more than <br />10 acres are disturbed and drained to a single point of <br />discharge temporary sediment basins must be installed, <br />however, if the site has sensitive features as determined by <br />the City or the potential of off site impacts, then temporary <br />sediment basins must be installed to protect the resource. <br />This is determined on a site by site basis. When site <br />restrictions do not allow for a temporary sediment basin, <br />equivalent measures such as smaller basins, check dams, <br />and vegetated buffer strips can be included. <br />(14) Location and engineered designs for structural stormwater <br />management practices including stormwater treatment <br />devices that remove oil and floatable material (e.g., basin <br />outlets with submerged entrances). <br />(15) Normal water level, high water level, and emergency <br />overflow elevations for the site. <br />(16) Floodway and flood fringe boundary, if available. <br />d. All proposed stormwater practices, hydrologic models, and design <br />methodologies shall be reviewed by City and certified for <br />compliance by the City in accordance with their plans and <br />specifications. <br />B. stormwater Management Performance Standards and Design Criteria <br />The applicant shall consider reducing the need for stormwater management <br />performance standards by incorporating the use of natural topography and land <br />cover such as natural swales and depressions as they exist before development to <br />the degree that they can accommodate the additional flow of water without <br />compromising the integrity or quality of the receiving waterbody. The <br />development shall minimize impact to significant natural features. Review the <br />site for steep slopes (greater than 12%), wetlands, wooded areas of significance, <br />rare and endangered species habitat, areas designated by the County Biological <br />Survey, metro greenways, or County parks and open space. These areas should <br />not be developed. The development shall limit impervious surface coverage. <br />Impervious surface coverage of a site shall not exceed that allowed by City <br />Ordinance. Proposed design, suggested location and phased implementation of <br />effective, practicable stormwater management measures for• plans shall be <br />designed, engineered and implemented to achieve the following results: <br />Volume Control -Stormwater runoff volume retention shall be achieved <br />onsite in the amount equivalent to the runoff generated from a one inch <br />rainfall over the impervious surfaces of the development for new <br />development and from a half inch rainfall over the impervious surfaces of <br />the development for redevelopment. The required stormwater runoff <br />volume reduction shall be calculated as follows: <br />Stormwater Ordinance 928- 6 <br />