Agenda - Council - 05/22/2007 - Laserfiche WebLink

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Preliminary Plat: GAD's Prairie May 24, 2006 Revised June 23, 2006 Page 2 of6 Trail & Sidewalk: The proposed trail has been revised to indicate a 10-foot wide trail on the east side of the parcel. It should also be noted that a portion .of this tail, the northernmost 100 feet is proposed to be loc.ated within the county highway right of way. Current policy is that trail should be located within the plat boundaries within the proposed plat. Because of the unique width constraints of this parcel, consideration is given to deviating from this protocol. Also, there is no sidewalk proposed along Helium Street. Although Helium Street is a through street, because of its close proximity of the trail consideration should be given to allowing the sidewalk to be eliminated. Grading & Drainage: The plat proposes ponding in the north western comer of the plat to contain runoff from the site. This pond is sufficiently large to nearly contain a 100 year storm event. Once this pond is full, additional runoff will backup and discharge into the county highway ditch and flow northward sheeting onto the adjacent property. Calculations need to be submitted showing the rate and volume of this discharge for the 100 year event are less than current discharge onto this property. Calculations should also show that there is no discharge to this property for the 10 year event. The drainage swale between the rears of Lots 1 through 4 is proposed at a I % grade which is the minimum grade allowable. West of this ditch is a steep slope from the neighboring property. Because of concern that this swale is likely to be filled with snow and ice which would impede swale flow, it is recommended that a storm sewer be installed to prove an additional outlet for melt runoff. Topographic contours should be extended 100 feet beyond the boundaries of the plat. The type, size, invert, and rim elevations of all storm sewers should be added to the grading plan. A permit needs to be obtained from the Lower Rum River Water Management Organization. Utilities: This plat will be served by municipal sanitary sewer and water. Trunk charges will be collected for units in excess of the singe family unit which is currently located on the property and serviced with watermain. Traffic Generation Analysis: This plat is anticipated to generate approximately 70 additional trips per day which will be directed onto CSAH 5. The major mtersections which will be impacted by traffic from this development include; CSAH 5 & Sunwood Drive; CSAH 5 & Alpine Drive; and CSAH 5 & TH 47. Each of these intersections was included in a traffic impact study prepared in November of 2005 for the nearby Meadows Development which was estimated to generate a total of 362 additional trips. In that study it was documented that the current Level of Service at these intersections were at a level C, except for the morning peak hour at Sunwood and CSAH 5 which was determined to be a level D. Level D is considered to be the lowest acceptable level of service. The conclusions of this traffic analysis suggested that by the year 2026 capacity constraints would occur on CSAH 5 which would require the widening of CSAH % from two to four lanes between TH 47 and Alpine Drive. -169-