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n. Conceptual Basis for Hardcover Limits on Individual <br />Properties <br />Limiting the extent of impervious surfaces near the lakeshore is but one <br />pan of Orono's overall plan for environmental protection, as outlined <br />m the 23-page Environmental Protection Plan element of the 1980 <br />urono Community Management Plan (CMP). <br />Prima^ environmental protection goal is to preserve the <br />quality of Lake Minnetonka. This 10th largest lake in Minnesota is the <br />smgle most significant natural feature of western Hennepin County. It <br />has substanu^ public value as a recreational asset, as an environmental <br />resouTM, Md as a setting for private residential development. Lake <br />Minnetonka is dependent upon wratershed runoff for replenishment. <br />“ '“''y susceptible to pollution <br />Wds. The combinauon of a single-source local ivater supply <br />relatively small watershed area, many channel restrictions betw^ <br />^te bays, and a single outlet, result in an extremely long 25-year <br />t change. Once pollutants enter the <br />Lake, they tend to remain a long time and are not easily diluted. <br />M^ement of aomiwater runoff is essential for the protection of the <br />water quali^ of Lake Minnetonka. Urbanization of the lakeshore, due <br />0 an ever-increasing demand for residential development near the <br />^ non-point source pollution from stoimwater <br />runoff. The pnmary water quality problems occurring as a result of <br />runoff Ufe oajmed by accummulation of pollutants and/or by <br />result in immediate water quality <br />effects. National studies have repeatedly shown that urban non-poim <br />mputs are a significant part of total water pollution loading. <br />The primani pollutants moved by urban stoimwater runoff are <br />sediment, oxypn-demanding substances, nutrients, heavy metals <br />bactena, chlondes bom road salt, oil and grease, pesticides iL PCB's’ <br />nartf^ ‘i—1" Pollntants tend to adsorb onto fine soil <br />Percies limiting the transport of pollutant-laden sediments into the <br />Ae « of pnme importance. One positive way of accomplishing this <br />to maximize the area in which runoff can be absorbed or filtered by <br />limiting the percentage of hardsurface on properties near the lake. <br />Minnetonka's 125 mile shoreline lies within the <br />City of Orono, and a large proportion of Orono's shoreline is urban