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Storm Water Management 114 <br /> <br /> <br />(E) Drain inlet protection. All storm drain inlets shall be protected during construction until <br />control measures are in place with a straw bale, silt fence, or equivalent barrier meeting accepted design <br />criteria, standards, and specifications contained in the Minnesota Pollution Control Agency publication <br />Protecting Water Quality in Urban Areas. <br /> <br />(F) Site erosion control. The requirements of this division (F) apply only to construction activities <br />that result in runoff leaving the site. <br /> <br />(1) Channelized runoff from adjacent areas passing through the site shall be diverted around <br />disturbed areas, if practical. Otherwise, the channel shall be protected as described below. Sheetflow <br />runoff from adjacent areas greater than 10,000 square feet in area shall also be diverted around disturbed <br />areas, unless shown to have resultant runoff velocity of less than 0.5 ft./sec. across the disturbed area for <br />the 1-year storm. Diverted runoff shall be conveyed in a manner that will not erode the conveyance and <br />receiving channels. <br /> <br />(2) All activities on the site shall be conducted in a logical sequence to minimize the area of <br />bare soil exposed at any 1 time. <br /> <br />(3) Runoff from the entire disturbed area on the site shall be controlled by meeting either <br />divisions (F)(3)(a) and (F)(3)(b) or divisions (F)(3)(a) and (F)(3)(c). <br /> <br />(a) All disturbed ground left inactive for 14 or more days shall be stabilized by seeding or <br />sodding (only available prior to September 15) or by mulching or covering or other equivalent control <br />measure. <br /> <br />(b) For sites with more than 3 acres disturbed at 1 time, or if a channel originates in the <br />disturbed area, 1 or more temporary or permanent sedimentation basins shall be constructed. Each <br />sedimentation basin shall have a surface area of at least 1% of the area draining to the basin and at least 3 <br />feet of depth and constructed in accordance with accepted design specifications. Sediment shall be <br />removed to maintain a depth of 3 feet. The basin discharge rate shall also be sufficiently low as to not <br />cause erosion along the discharge channel or the receiving water. <br /> <br />(c) For sites with less than 10 acres disturbed at 1 time, silt fences, straw bales, or <br />equivalent control measure shall be placed along all side slope and downslope sides of the site. If a <br />channel or area of concentrated runoff passes through the site, silt fences shall be placed along the <br />channel edges to reduce sediment reaching the channel. The use of silt fences, straw bales, or equivalent <br />control measure must include a maintenance and inspection schedule. <br /> <br />(4) If remaining for more than 7 days, they shall be stabilized by mulching, vegetative cover, <br />tarps or other means. Erosion from piles which will be in existence for less than 7 days shall be <br />controlled by placing straw bales or silt fence barriers around the pile. In-street utility repair or <br />construction soil or dirt storage piles located closer than 25 feet of a roadway or drainage channel must be <br />covered with tarps or suitable alternative control, if exposed for more than 7 days, and the storm drain <br />inlets must be protected with straw bale or other appropriate filtering barriers.