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1972 Ordinance No. 138 added language that required all permits to be compatible with the <br /> LMCD's "Storm Water Runoff and Shoreland Guidelines Policy Statement". <br /> 1974 Ordinance No. 167 established that a conditional use permit was required for filling or <br /> grading within the City. <br /> 1974 The City's 1974 Storm Water Management Plan documented the work done in the late <br /> 1960's and early 1970's to establish that phosphorus from stormwater runoff is the most <br /> significant limiting factor in the water quality of Lake Minnetonka, and established that <br /> Orono's wetlands have a high potential to remove phosphorus from runoff before it <br /> reaches the lake. However, on a net overall basis Orono was shown to not have enough <br /> wetlands to assimilate the phosphorus load from urban development density, and this <br /> resulted in the citywide rezoning of 1975 which placed 80% of Orono's land areas in <br /> rural density 2-acre and 5-acre zones. <br /> 1975 In June 1975 the City accepted the Wetlands Inventory and Classification aerial plat <br /> map overlays completed by the Hennepin Soil and Water Conservation District. <br /> 1975 Ordinance No. 179 added language that prohibited "filling, grading, dredging, <br /> exca�ation, hardcover, temporary or permanent structures, or construction" within the <br /> Flood Plain and Wetlands Conservation Area or within 26' of that Area, as well as on <br /> lands subject to conservation easements. In 1975 major portions of Orono were rezoned <br /> to low-density residential. Hardcover Ordinance was adopted. <br /> 1976 MnDNR Public Waters Inventory completed. <br /> 1978 Ordinance No. 2l3 was a complete update of the Flood Plain and Wetlands Management <br /> sections of the City Code. It included numerous definitions; it established the Floodway, <br /> Flood Fringe and General Flood Plain Districts; it referenced a number of maps (the <br /> USGS quads; the City's 1975 Wetlands Inventory and Classification Maps; and the <br /> FEMA Flood Insurance Rate Maps dated October 17, 1978). It incorporated standards <br /> for permitted and conditional uses within the Floodway and Flood Fringe Districts, and <br /> established procedures for review of CUP's. It established more detailed and restrictive <br /> standards regarding the calculation of minimum lot areas for properties having wetlands. <br /> It established additional requirements required by FEMA in regards to flood plain <br /> management. <br /> What Ordinance No. 213 was lacking, however, was (perhaps by design) a set of criteria <br /> for mitigation when wetland alterations were allowed by variance or CUP. Only a few <br /> wetland alteration permits were granted each year after 1978, most for opening up a pond <br /> within an existing wetland, but some that involved filling, usually to create access to <br /> property otherwise not accessible. The lack of a mitigation requirement has been seen by <br /> staff as problematic through the years... <br /> 1980 Orono's 1980 Community Management Plan reinforced the basis for protection of <br /> wetlands as the primary natural filter for stormwater runoff. <br /> Page 2 <br />