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I <br />gNVIRQNMENTAL JUNE, 1980 <br />15. EROSION CONTROL PLANS AND PROGRAMS WILL BE REQUIRED IN ALL LAND <br />ALTERATION PROJECTS. Each contractor will be required to minimize <br />the probability of soil erosion on site and/or siltation damage <br />downstream. The smallest amount of bare ground shall be exposed <br />for as short a time as possible. Temporary ground cover will be <br />required until permanent cover is provided. Sediment traps will be <br />required on slopes and between construction sites and public roadways <br />Fill must be compacted and stabilized for permanence. <br />URBAN AREA POLICIES FOR NATURAL RPSQURCE MANAGEMENT <br />1. <br />3. <br />4. <br />5. <br />LAND USE STANDARDS WILL LIMIT THE IMPACT OF URBAN ENCROACHMENT ON <br />LAKE MINNETONKA. Minimum lot widths will space out docks and <br />structural encroachments while increasing areas of natural vegetation <br />Lake use regulations will limit the number of boats per property and <br />the amount of public waters available for private docking and boat <br />storage. <br />RETENTION OF NATURAL VEGETATION WILL LIMIT THE IMPACT OF URBANIZATION <br />AS VISIBLE FROM THE LAKE. Building heights will be limited to less <br />than the typical tree height. Minimum green belts will be provided <br />with prohibitions against clearcutting or excessive thinning of <br />vegetation. Natural vegetation will be preserved on slopes. Retaining <br />walls will be discouraged except when absolutely necessary to prevent <br />erosion, in which case they will be screened with natural vegetation. <br />I <br />I <br />I <br />i <br />I <br />i <br />I <br />DIRECT RUNOFF INTO THE LAKE WILL BE MINIMIZED. Standards will be <br />and maintained to limit the amount of impervious hardcover <br />in proportion to closeness of the shoreline. Maximum hardcover will <br />be limited to 30% of each parcel within 1,000 feet of the shoreline <br />pursuant to Mn. DNR recommended shoreline practices. <br />ALL EXISTING URBAN WETLANDS WILL BE MAINTAINED AND PROTECTED FOR <br />SURFACE WATER RETENTION AND FILTRATION. The existing urban runoff <br />exceeds the capacity of the urban marshes to assimilate all nutrients, <br />^^®^®^®^® ®<Jditional pollution hazards would be created if any wetlands <br />would be lost. Additional steps to improve nutrient assimilation <br />include on~site retention on all new developments and storm water <br />recycling through the existing marshes. <br />CITY MAINTENANCE PRACTICES WILL BE DESIGNED TO IMPROVE STORM WATER <br />QUALITY. Salt use for winter street treatment will be minimized. <br />Snow removal practices will locate temporary storage sites where they <br />will not overload the natural drainage system or where foreign matter, <br />especially salt, will not directly enter a marsh or lake. Spring <br />cleanup will promptly remove road sands and salts before environmental <br />damage occurs. <br />i <br />I <br />i <br />i <br />i <br />i <br />I <br />CMP 3-22 I