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951 <br />952 <br />953 <br />954 <br />955 <br />956 <br />957 <br />958 <br />959 <br />960 <br />961 <br />962 <br />963 <br />964 <br />965 <br />966 <br />967 <br />968 <br />969 <br />970 <br />971 <br />972 <br />973 <br />974 <br />975 <br />976 <br />977 <br />978 <br />979 <br />980 <br />981 <br />982 <br />983 <br />984 <br />985 <br />986 <br />987 <br />988 <br />989 <br />990 <br />{4}d. Stormwatermanagement. The following general and specific standards shall <br />apply: <br />a1. General standards: <br />1-i. When possible, existing natural drainageways, wetlands, and <br />vegetated soil surfaces must be used to convey, store, filter, <br />and retain stormwater runoff before discharge to public <br />waters. <br />2ii. 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. Disturbed areas must be stabilized and protected as <br />soon as possible and facilities or methods used to retain <br />sediment on the site. <br />3iii. When development density, topographic features, and soil <br />and vegetation conditions are not sufficient to adequately <br />handle stormwater runoff using natural features and <br />vegetation, various types of constructed facilities such as <br />diversions, settling basins, skimming devices, dikes, <br />waterways, and ponds may be used. Preference must be <br />given to designs using surface drainage, vegetation, and <br />infiltration rather than buried pipes and manmade materials <br />and facilities. <br />4a2. Specific standards: <br />4-i. Impervious surface coverage of lots must not exceed 25 <br />percent of the lot area. <br />2ii. When constructed facilities are used for stormwater <br />management, documentation must be provided by a qualified <br />individual that they are designed and installed consistent with <br />the field office technical guide of the local soil and water <br />conservation districts. <br />3iii. New constructed stormwater outfalls to public waters must <br />provide for filtering or settling of suspended solids and <br />skimming of surface debris before discharge. <br />Special provisions for commercial, industrial, public/semipublic, agricultural, <br />forestry and extractive uses and mining of metallic minerals and peat. <br />a1. Standards for commercial, industrial, public, and semipublic uses. <br />4-i. Surface water -oriented commercial uses and industrial, <br />public, or semipublic uses with similar needs to have access <br />to and use of public waters may be located on parcels or lots <br />27 <br />