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free of limiting factors must be provided for a replacement <br /> standard soil treatment system for each sewage system. <br /> (2) Conservation subdivisions shall be connected to publicly <br /> owned water supply and sewer systems, if available.Where <br /> publicly owned water supply and sewer systems are not <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 faust be eenneete <br /> te publiely e%med water supply and sewer systems, whe <br /> Vie. <br /> (2) Ott site water supply and sew-age treatment systems must <br /> (3) On-site sew-age—treatment-systems must be 1,.,.ate <br /> suitable area of the develepment, and suffleient lawn are-e <br /> seil treatment system for eaeh sew-age 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 /> (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 />