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iii. Require criteria for wet detention basin minimum pollutant removal <br /> efficiency to protect and improve stormwater runoff quality. Best <br /> management practices for development and redevelopment should result in <br /> TSS and TP reductions (suggested guidance - Minnesota Stormwater <br /> Manual). <br /> iv. Require infiltration of the first '/z inch of runoff from the impervious areas <br /> created by new projects where there are A and B soils. Use of infiltration <br /> techniques is prohibited in some potential stormwater hotspot areas, e.g. <br /> vehicle fueling areas (suggested guidance - Minnesota Stormwater Manual). <br /> v. Recommend adding a soil amendment and requiring soil ripping 1 '/z-2 feet <br /> after mass grading is complete for all soil types. <br /> vi. Require infiltration in wellhead protections areas to be based on the <br /> community's wellhead protection plan and at the discretion of the local <br /> government. � <br /> vii. Require pretreatment of stormwater prior to discharge into all lakes and <br /> streams. <br /> B. Rural planning area communities, excluding MS4 communities, need to provide <br /> information on how they intend to mana�e stormwater: <br /> i. Include an erosion and sediment control ordinance consistent with NPDES <br /> Construction Stormwater permit requirements <br /> ii. Identify ways to control runoff rates so that land-altering activities do not <br /> increase peak stormwater flow from the site for a 24-hour precipitation event <br /> with a return frequency of l or 2 years <br /> iii. Require criteria for wet detention basin minimum pollutant removal <br /> efficiency to protect and improve stormwater runoff quality for areas where <br /> development is occurring. Best management practices for redevelopment <br /> (suggested guidance - Minnesota Stormwater Manual) should result in TSS <br /> and TP reductions. <br /> C. All communities with designated trout streams must identify actions in their plan <br /> to address the thermal pollution effects from development. <br /> D. All communi�ies with special waters, such as outstanding resource value waters, <br /> need to meet state requirements for development near these waters (see Appendix <br /> A part B.1-8 of the Minnesota Construction General Permit for a list of these <br /> waters and Appendix A part C.1-5 for specific requirements). � <br /> E. All communities need to consider the use of stormwater practices that promote <br /> infiltration/filtration and decrease impervious areas (better site design and <br /> integrated stormwater management), where practical. <br /> F. All communities need to include information on the types of best management <br /> practices to be used to improve stormwater quality and quantity and the <br /> maintenance schedule for the best management practices. <br /> G. All communities need to include a wetland manabement plan or a process and <br /> timeline to prepare a plan. At a minimum, the wetland management plan should <br /> incorporate a function and value assessment for wetlands. Other items to address in <br /> the plan include the pretreatment of stonnwater prior to discharge into all wetland <br /> types, and the use of native vegetation as buffers for high quality wetlands. Buffers <br /> should be consistent with the functions and values identified in the plan. <br /> 86 <br />