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COMMUNITYGROWTH ary,f <br /> n <br /> I N S T I T U T E 1 equait_ <br /> Expert, iri Snrall Town Plarrrrirris Lakes` <br /> available, conservation subdivisions shall either establish <br /> \.. dedicated areas for individual sewage treatment systems or <br /> establish centralized water supply and sewage treatment <br /> systems to serve the entire subdivision. <br /> (i) Residential planned unit developments must be eenneete <br /> te puWiely eymed ivater supply and sewer systems, when <br /> available. <br /> (2) On site water supply and sew-age treatment systems mus <br /> ef Health and the Minnesota Pollution Gentrel Ageney. <br /> (3) On site sew-age <br /> F. Erosion control and Stormwater Management. Erosion control <br /> and stormwater management for developments must meet the <br /> standards in Section 17-8.2(3)(F). For planned unit <br /> developments,the impervious surface coverage shall not exceed 15 <br /> percent in either the total project area or the first tier. For <br /> conservation subdivisions, the impervious surface coverage for <br /> lots must meet the standards in 17-8.2(3)(F). Erosion control and <br /> stormwater management shall be designed by certified personnel <br /> in erosion and sediment control using the best management <br /> practices found in the latest Pollution Control Agency's <br /> stormwater best management practices manual, approved by the <br /> local government,and effectively implemented. <br /> (1) For post construction stormwater management, when <br /> possible, existing natural drainage ways, wetlands, and <br /> vegetated soil surfaces must be used to convey, store,filter, <br /> and retain stormwater runoff before discharge to public <br /> waters. When development density, topographic features, <br /> and soil and vegetation conditions are not sufficient to <br /> adequately handle stormwater runoff using natural <br /> features and vegetation, various types of constructed <br /> facilities such as diversions, settling basins, skimming <br /> devices, dikes, waterways, and ponds may be used. <br /> Preference must be given to designs using surface <br /> drainage, vegetated filter strips, bioretention areas, <br /> rainwater gardens, enhanced swales, off-line retention <br /> areas, and natural depressions for infiltration rather than <br /> buried pipes and human-made materials and facilities. <br /> (2) Development must be planned and conducted in a manner <br /> that will minimize the extent of disturbed areas, runoff <br /> velocities, erosion potential, and reduce and delay runoff <br /> Pequot Lakes Staff Report 4(b)-6 <br /> January 15,2009 <br />