11/28/2001 Environmental Board Minutes

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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 wal ultimately increase erosion. Trehus inquired about a reduced slope on the driveways. Pow 11 re;onaed the City would consider shorter driveways, but not crowned beat , taiiveways were over 10% and most were between 4-8%. Staff explained the difference between urban and ralrroadsi fd noted that rural roads were being used in a new subdivision. The `W['atershedDistrict recommends storm sewer inlets to be set back from the curbsw storm sewers have the inlets in the curbs. would have an effect on infiltration. The road going into ditches on both sides. Grundhofer posed the question if Powell stated that in an urban seth right-of-way with ditches. to make the ditch narrower` the parts of the City with nogconvinced that this item sections of the City had a crowned Trehus inquired about indicated that the Ci needed to be in then ":i=ii Grundhofer pointe curb-t$;.�c,, to freezeran difficult scauld'incorporate more curbless streets. curbless streets consume too much of the a slope of 3:1, the slope can be slightly changed pint ` l e right-of-way. Chair Kuko>4equestioned 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. ave the ditch in the right-of-way. Powell %control the ditch to maintain it, so the ditch vay otan easement. at a rural road used less right-of-way space than the st"ted;.that the rural road works well in the township, but due wnsilam, sitting water made the ditches and culverts ain. He added that there were no dry swales in the City. 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,