05-20-2013 Planning Commission Packet

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,�, . , . 1972 Ordinance No. I38 added lan�age that required all perniits to be compatible with the LMCD's"Storm Water Runoff and Shoreland Guidelines Policy Sta.tement". 1974 Ordinance No. I67 established that a conditional use permit was required for filling or grading within the City. 1974 The City's 1974 Storm Water Management Plan documented the work done in the late 1960's and early 1970's to establish that phosphorus from stormwater runoff is the most significant limiting factor in the water quality of Lake Minnetonka, and established that Orono's wetlands have a high potential to remove phosphorus from runoff before it reaches the lake. However, on a net overall basis Orono was shown to not have enough wetlands to assimilate the phosphorus load from urban development density, and this � resulted in the citywide rezoning of 1975 which placed 80% of Orono's land areas in rural density 2-acre and 5-acre zones. 1975 In June 1975 the City accepted the Wetlands Inventory and Classification aerial plat map overlays completed by the Hennepin Soil and Water Conservation District. 1975 Ordinance No. I79 added language that prohibited "filling, grading, dredging, � _ excavation, hazdcover, temporary or permanent structures, or coristruction" within the - Flood Plain and Wetlands Conservation Area or within 26' of that Area, as well as on . lands subject to conservation easements. In 1975 major portions of Orono were rezoned to low-density residential. Hardcover Ordinance was adopted. `� 1976 �MnDNRPublic Waters Inventory completed. 1978 Ordinance No. 213 was a complete update of the Flood Plain and Wetlands Management sections of the City Code. It included numerous defuutions; it esta.blished the Floodway, Flood Fringe and General Flood Plain Districts; it referenced a number of maps (the USGS quads; the City's 1975 Wetlands Inventory and Classification Maps; and the FEMA Flood Insurance Rate Maps dated October 17, 1978). It incorporated standards for permitted and conditional uses within the Floodway and Flood Fringe Districts, and established procedures for review of CUP's. It esta.blished more detailed and restrictive standards regarding the calculation of minimum lot areas for properties having wetlands. It established additional requirements required by FEMA in regards to flood plain management. What Ordinance No. 213 was lacking, however, was (perhaps by design) a set of criteria for mitigation when.wetland alterations�were allowed by variance or CUP. Only a few wetland alteration pernuts were granted each year after 1978, most for opening up a pond within an existing wetland, but some that involved filling, usually to create access to property otherwise not accessible. The lack of a mitigation requirement has been seen by staff as problematic through the years... 1980 Orono's I980 Community Management Plan reinforced the basis for protection of wetlands as the primary natural filter for stormwater runoff. ' Page 2