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R�solution No. /G'�7 � Page 7 , 6 . A 1971 PCA study by Narza Engineering Company, Barr Engineering Company, Eugene Hickock and Associates, and the University of Minnesota Limnological Research Center concluded ." that Lake rSinnetonka was being subject to accelerated eutrophication caused by existing and increasing urbanization of the watershed and consequent increasing inputs of nutrient elements including phosphorus and nitrogen. 7 . Orono Ordinance No. 213, The Flood Plain and Wetlands Ma�agement Ordinance, adopted October 26, 1978, references and adopts the October 17, 1978 HUD Flood Insurance Study which had been ongoing since rlarch, 1974. This study and Ordinance identifies the following in regards to Stubbs Bay (see Exhibit F) . � . -Ordinary high water elevation: . 929 . 4 ft. MSL -Regulatory flood protection elevation: 932 . 5 ft. MSL -Special flood hazard areas caused by tributary � . to Stubbs Bay (includes Marina property) : Flood hazard zone A-2 (below) 931. 0 ft. MSL • Sheet flow area ( lft, depth) zone A-0 (below) 935. 0 ft. MSL -Regulatory flood protection elevation: �1 ft, above ground � level but not less than 932.5 ft. MSL B. NATURAL LAND FEATURES - . 1. The Study Area topography is of two basic types . The land near the Bay is relatively flat including some marshland and flood prone areas . T'he flat areas extend from the shoreline � back several hundred feet in some areas , notably the large marsh . along the northwest tributary- to the bay. The remaining land is gently rolling to steep slopes rising 30 to 40 feet above lake _ level. Slopes range above 100% along the northeast tributary creek, 50-100% between West Lake S_treet and Tonkawa Road and 5-20% t�ihere most of the residencest'are constructed. 2. The Study Area soils range from Marsh, Lake Beaches and ' Hamel loams in the marshy areas to Kilkenny and Lerdahl loams on. the slopes . All of these soils have generally high ground water elevations (6" to 3 ' ) . The Kilkenny soils have generally high (slow) percolation rates . The Marsh and Lake Beach soils � • perc fast but fail to clean nutrients or bacteria before exposure ` � to groundwater. Consequently, none of these soils is considered suitable for standard on-site sewage treatment systems by the HSWCD, � PCA, M�'WD, MHD, or City. Given suitable slopes , the Kilkenny loams will support mound type sewage treatment systems.