07/25/2001 Env Bd Packet - Laserfiche WebLink

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additional benefits to the community in terns of increased wildlife habitat, public safety, lessen maintenance costs, and enhance the efficiency of the treatment of stone water runoff. 1. Provision for splitting the pond into one or more cells if the site conditions allow for such partitioning 2 Provision for a protective vegetative buffer strip above and surrounding the permanent pool that is at least 16.5 feet wide (I rod). 3. Provision for a skimming device at the outlet that prevents floatable materials from discharging from the pond. - 4. Provision for a forebay area or sump at each inlet to trap course sediments to allow for easier partial maintenance operations to extend the sediment storage design life of the basin. Subpart 2. - Alternative Methods of Storm Water Retention When the local governmental unit (LGU) has determined that Subpart 1 is not applicable, alternative methods of meeting the storm water retention requirement may be allowed by the LGU. These methods include the following alternative& a. Natural wetlands may only be used as an alternative method of retention if: 1. all necessary permits are received from the Department of Natural Resources if the impacted wetland is a public water, 2. the wetland is designated as a water quality treatment area in a BWSR approved water management plan or the practice is specified as a permitted practice in a BWSR approved water management plan and the local governmental unit is abiding by the provisions of the 1991 Wetland Conservation Act (WCA) ; a sediment trapping device or area is installed prior to discharge into the wetland that is designed to trap sediments 0.05 millimeters in size or greater with a trap volume size based upon a prescribed maintenance schedule; an easement is provided to the LGU to allow for proper - -- maintenance of the sediment trap and any outlet control device; a maintenance plan is in place that defines the frequency of maintenance, who is responsible for the maintenance and how the work will be accomplished and recorded with the property, if the property is not in public ownership; the natural outlet control elevation of the wetland, if it is not a public water, is not changed except when either a) the outlet is intended to restore the wetland to its original elevation, b) the wetland basin is landlocked and the artificial outlet control is placed 8/25/93 Version 7