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<br />774-6021 MAIER STEWART ASSOC. <br /> <br />124 P16 <br /> <br />APR 21'93 15:17 <br /> <br />. <br /> <br />8.4 <br /> <br />IrackiM. Each site shall have gravel~d roads, access drives and parking areas <<.')1 :\ull1ci~nl <br />wi..Jth and length to prevent sediment from being tracked onlO public or private ro..cJW3}'S. <br />Any sediment reaching a public or private road shall be removed by streel tlc.millg (nol <br />nushing) before the end of each workday. <br /> <br />8.S Orain inlet orotection. All s,torm drain inlets shall be protected during construed,)n until <br />ennlrol measures are in place with a straw bale, silt fcnce or equivalent barrier meeting <br />acc~pled design criteria, standards and specifications contained in the MPCA puhliC&ltion <br />.Protecting Water Quality in Urban Areas.- <br /> <br />8.6 Site erosion control. The following criteria (a. through d.) apply only to construction <br />activities that result in runoff leaving the site. <br /> <br />a) Channelized runorC Cram adjacent areas passing through the site shall hI.: diverted <br />around disturbed areas. if practical. Otherwise, the channel shall be protected as <br />described below. Sheetfiow runorf from adjacent areas greater than 10.000 SqUilrC feet <br />in area shall also be diverted around disturbed areas, unless shown to have resultant <br />runoff rates or less than 0.5 fL3/sec. across the disturbed area for the one )'Cilr storm. <br />Diverted runoff shall be conveyed in a manner that will not erode the convcymlce and <br />receiving channels. <br /> <br />b) All activities on the site shan be conducted in a logical sequence to minimize the area <br />of bare soil exposed at anyone lime. <br /> <br />. <br /> <br />c) Runoff from the entire disturbed area on the site shall be controUed by meeting either <br />subsections 1 and 2 or 1 and 3. <br /> <br />I} All disturbed ground left inactive (or fourteen or more days shall be st.lhili~cd by <br />seeding or sodding (only available prior to September IS) or by lnull.:hing or <br />covering or other equivalent control measure. <br /> <br />2) For sites with more than ten acres disturbed at one lime. or if a channc1l11 igin<tlcs <br />in the disturbed area, one or more temporary or permanent sedimentalitlll basins <br />shall be constructed. Each sedimentation ba5in shall have a surface area of at <br />least one percent of the area draining to the basin and at Jeast three feet (lC depth <br />and constructed in accordance with aceepled design specifications. Sedinu:nl shall <br />be removed to maintain a depth of three reeL The basin discharge rate shall also <br />be sufficiently low as to not cause erosion along the dischar,e channel or the <br />receiving water. <br /> <br />3) For sites with less than ten acres disturbed at one time. silt fences, straw bales. or <br />equivalent control measures shall be placed along aU sideslopc and downslope <br />sides of the site. If a channel or area of concentrated runoff passes through the <br />site. silt fences shall be placed along the channel edges to reduce sediment <br />reaching the channeL The use or silt fences. straw bales, or equivalent control <br />measures must include a maintenance and inspection schedule. <br /> <br />. <br /> <br />d) Any soil or dirt storage piles containing more than ten cubic yards or maleriul should <br />not be located with a downslope drainage length of less than 2S feet from the toe of <br />the pile to a roadway or drainage channel. If remaining for ,more than seven days, they <br />shall be stabilized by mulching. vegetative cover, larps or other means. Erosion Crom <br />piles which will be in existence for less than seven days shall be controlled hy placing <br />straw bales or silt fence barriers around the pile. In-street utility repair or cOllstruclinn <br />soil or dirt storage piles located 'closer than 25 feet of a roadway or drainage channl.:l <br />must be covered wilh tarps or suitable alternative control, if exposed for mure than <br />