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INI (2) On site water sUpply and sewage treatinefit systems mus <br /> be eentralized and designed and instaRed to meet or emeee <br /> appheable standards or igiles ef the Minnesota Department <br /> of Health and the Minnesota PeRtition Gentrel Ageney. <br /> (3) On site sewage treatment systems be ,,.,,ate <br /> suitable area of the development, and suffleient laym are-a <br /> seil treatment system fer eaeh sewage system. <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 /> (i) 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 /> volumes. Erosion prevention and sediment control <br /> practices must be used to retain sediment on site. <br /> Disturbed soil areas must be stabilized and protected as <br /> soon as possible. The maximum time the soil in a project <br /> area can remain exposed when the area is not actively <br /> being worked is 3 days. Temporary or permanent cover for <br /> the exposed areas is required at that time but should be <br /> installed sooner if possible. All deltas and sediment <br /> CITY OF PEQUOT LAKES I Shoreland Conservation Design Standards Page 6 of 15 <br />