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Recommended Wetland Management Standards Minnesota Routine Assessment Method for Evaluating Wetland Functions, Version 3.0 Management Class Management Strategy Stormwater T reatment Buffer1 Mitigation Standard Hydrologic Guidelines AtPreserve Maintain wetland and Avoid conve)led flows where ~50 feet for WCA minimum or greater replacement ratio with Bounce (10 yr): Existing existing functions , values 12rudent and feasible . water quality documented replacement of functions/values . Inundation (1 & 2 yr): Existing and wildlife habitat. Upstream sediment and ~ 100 feet for Consider requiring buffer replacement. (10 yr): Existing Possible need for active nutrient pretreatment wildlife Runout Contro/:3 No Change management of wetland to reguired to maintain habitat.2 Maintain existing hydrology . protect unique background loading rates . Require Encourage infiltration and -vaftle&features . Apply mGFe Maintain existing monuments reduced impervious BMPs . strict avoidance aA4 hydrology flessil:Jly divert to mark Conduct water budget analysis. seqlleAs iAg standards . increased flows . Avoid buffer edge . S1,1ggest graAtiAgMall be concentrating fl ows . a1212ro12riate to develo12 a conservation easement. B--Manage 1 Maintain wetland aA4 IJflslreaFA seeimeAt aAe WCA minimum or greater replacement ratio. Bounce (10 yr): Existing + 0 .5 ft without degrading existing RYlfieflt 35-50 feet Replacement of functions and values on site or in Inundation (1 & 2 yr): Existing functions , values and flFetreatmeAt.Pretreat location specified in plan for drain/fill/~ plus 1 day wildlife habitat . Apply WCA conve)led flows to maintain Require excavation impacts . fJ.Q...rr1. Existing + 7 days sequencing process . background loading rates . monuments Runout Contro/:2 No Change to mark In com12liance with Ch . 7050 the entire area Maintain existing hydrology . buffer edge . affected blr'. storm water or other wastewater flows Encourage infiltration and must be avoided , minimized and re12laced at a reduced impervious BMPs . re12lacement ratio of 1: 1 for all changes in wetland !YQg. C--Manage 2 Maintain wetland footprint. IJflstream seeimeAt l:JasiA WCA minimum replacement of acreage and Bounce (10 yr): Existing + 1 .0 ft Improve wetland biological treatmeAt.Pretreat all 25-35 feet functions/values on site or in location specified in Inundation (1 & 2 yr): Existing and 12lant communitll conve)led discharges to Require plan for drain/fill/excavation im12acts plus 2 days diversity/integrity or remove all heavll particles monuments fJ.Q...rr1. Existing + 14 days enhance other functions if and maximize removal of to mark In com12liance with Ch . 7050 the entire area Runout Control: 2 0 to 1. 0 ft possible . _Apply WCA fine grained sediment 12rior buffer edge . affected blr'. storm water or other wastewater flows above existing runout sequencing process. to discharging to the must be avoided , minimized and re12laced at a ' Consider for restoration . wetland re12lacement ratio of 1: 1 for all changes in wetland !YQg.c D--Manage 3 Allow for relaxed IJflslreaFA seeimeAt WCA allows mitigation flexibilitlr'. with minimum Bounce (10 yr): sequencing and reme>1al.Pretreat all 25 feet standards required in the plan area , see M.R. No Limit replacement plan flexibility. conve)led flows to remove 8420.0650, Inundation (4-1 & 2 yr): Consider for all medium grained and Existing plus 7 days restoration/enhancement . larger sediments . In com12liance with Ch . 7050 the entire area fJ.Q...rr1. Existing + 21 days affected blr'. storm water or other wastewater flows Runout Contro/:2 O to 4 .0 fl must be avoided , minimized and re12laced at a above existing runout re12lacement ratio of 1 :1 for all changes in wetland !YQg.lAJGI>, miAim1,1m FefllasemeAt er as Sflesifiee l:Jy lesal wetlaAe maAagemeAt fllaA. Refllase lest fllAStieRS .