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be set back the following distances if located in an area <br />which has been designated as follows by any local, state or <br />federal regulation. <br />Regulation <br />Recreational development lakes <br />General development lakes and <br />streams <br />$Ptback Distance in Feet <br />75* <br />50* <br />Wild river 150* <br />Scenic river 100* <br />Critical river 100* <br />Designated tributaries of wild, 75* <br />scenic and recreational rivers <br />*Required for new developments and, where practicable, for <br />existing developments. <br />5. Soil treatment areas shall not be placed in flood <br />plains delineated by local ordinances adopted in compliance <br />with the Statewide Standards and Criteria for Management of <br />Flood Plain Areas of Minnesota (Minn. Reg. NE 85 -93), or in <br />areas for which regional flood information is available from <br />the Department of Natural Resources. <br />Design and Construction <br />1. The bottom of trenches and beds shall be at least <br />four (4) feet above the water table or bedrock. <br />2. The trenches shall be not less than eighteen (18) <br />inches, nor more than thirty -six (36) inches wide. Any trench <br />wider than thirty -six (36) inches shall be considered a bed. <br />3. Trenches and beds shall be not more than one hundred <br />(100) feet in length. <br />4. The bottom of the trench or bed excavation shall be <br />level. <br />5. The bottom and sidef the trench or bed excavation to <br />the level of the filter material shall be scarified to remove <br />smears left by the construction equipment and footprints. All <br />loose material shall be removed from the excavation. The <br />bottom of the excavation shall not be driven on or walked on <br />after scarification. <br />6. When the soil percolation rate at the bottom of the <br />trench or bed is slower than fifteen (15) minutes per inch, no <br />