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y- avHAC~h^[9•~ <br />6:91,'E12 <br />v~~ATE ~S 9~ro E Q <br />9=~G~~TNCt~.S <br />May ao16 <br />b. Final site conditions including stormwater inlets and permanent nonstructural and <br />structural SCMs. Details of SCMs shall be drawn to scale and shall show <br />volumes and sizes of contributing drainage areas. <br />c. Any other structural and/or non-structural SCMs necessary to meet the design <br />criteria in this regulation and any supplemental information requested by the <br />Village Engineer. <br />d. Each SCM shall be designated with an individual identification number. <br />1128.09 PERFORMANCE STANDARDS <br />A. General: The stormwater system, including SCMs for storage, treatment and control, and <br />conveyance facilities, shall be designed to prevent structure flooding during the 100-year, 24-hour <br />storm event; to maintain predevelopment runoff patterns, flows, and volumes; and to meet the <br />following criteria: <br />Irate rg ated practices that address degradation of water resources. The SCMs shall <br />function as an integrated system that controls flooding and minimizes the degradation of <br />the physical, biological, and chemical integrity of the water resources receiving <br />stormwater discharges from the site. Acceptable practices shall: <br />a. Not disturb riparian areas, unless the disturbance is intended to support a <br />watercourse restoration project and complies with Chapter 1127 of the Mayfield <br />Village Codified Ordinances. <br />b. Maintain predevelopment hydrology and groundwater recharge on as much of the site <br />as practicable. <br />c. Only install new impervious surfaces and compact soils where necessary to support <br />the future land use. <br />d. Compensate for increased runoff volumes caused by new impervious surfaces and <br />soil compaction by reducing stormwater peak flows to less than predevelopment <br />levels. <br />e. Be designed according to the methodology included in the most current edition of <br />Rainwater and La~zd De>>elopment or another design manual acceptable for use by the <br />Village of Mayfield and the Ohio EPA. <br />SCMs that meet the criteria in this regulation, and additional criteria required by the <br />Village Engineer, shall comply with this regulation. <br />2. Practices designed for final use: SCMs shall be designed to achieve the stormwater <br />management objectives of this regulation, to be compatible with the proposed post- <br />construction use of the site, to protect the public health, safety, and welfare, and to <br />function safely with routine maintenance. <br />Stormwater management for all lots: Areas developed for a subdivision, as defined in <br />Chapter 1128, as well as pertinent provisions of the Village of Hayfield's Codified <br />15 <br />