02/27/2002 Env Bd Packet - Laserfiche WebLink

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• • ENVIRONMENTAL BOARD MEETING NOVEMBER 28, 2001 compaction would be different with the imported and the native soil. He pointed out ideally the soil should be moved around on site. Asleson added that once the developer had finished establishing the soil, no heavy machinery should be used on site, or different, smaller machinery could be used. Powell described that the Watershed District wanted short crowned driveways to increase infiltration. The City required a 30 -foot setback from the right -of -way according to the Zoning Ordinance, and allowed 46 -foot long driveways to reduce the concentrated flow on the sides of the driveway which would ultimately increase erosion. Trehus inquired about a reduced slope on the driveways. Powell responded the City would consider shorter driveways, but not crowned because no driveways were over 10% and most were between 4 -8 %. Staff explained the difference between urban and rural roads and noted that rural roads were being used in a new subdivision. The W ed District recommends storm sewer inlets to be set back from the curbs, w + he parts of the City with storm sewers have the inlets in the curbs. Staff no vinced that this item would have an effect on infiltration. The rur sec • ns o e City had a crowned road going into ditches on both sides. Grundhofer posed the question if the Ci Powell stated that in an urban setting cur right -of -way with ditches. W. to make the ditch narrower Trehus inquired abou indicated that the City needed to be in the right- orporate more curbless streets. eets consume too much of the • 1, the slope can be slightly changed right -of -way. e the ditch in the right -of -way. Powell control the ditch to maintain it, so the ditch or an easement. Grundhofer pointed out that a rural road used less right -of -way space than the curb -to -curb. Powell stated that the rural road works well in the township, but due to freeze and thaw downstream, sitting water made the ditches and culverts difficult to maintain. He added that there were no dry swales in the City. Chair Kukonen questioned the pros and cons of swales as an outlot. Powell admitted that it would need to be wide enough, and that an alley would probably form behind fences in the backyards. He agreed it would be an upfront way to deal with drainage and would ensure against surprises for residents. Powell indicated that some have an easement for drainage or ponding. Trehus inquired about what was presently being done, and expressed the desire to exceed the requirements of the Watershed District. Powell responded that infiltration galleries are being used in Bluebill Ponds with capped,12 -inch tubes,