7.7. SR 12-18-1995 - Laserfiche WebLink

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DEC-15-95 F R I 6:12 M S A ST PAUL- Mr. Steve Ach December 15, 1995 Page Two P - 0 3 Also shown on the Plan are some areas proposed to be used as stormwater treatment ponds. No calculations are shown on the Plan referencing the design of these ponds. We would recommend the City request complete calculations for these ponding areas, including stormwater inflow and outflow information, as well as high -water levels. ■ The Plan still lacks catch basin design and pipe diameters. • The west end of 199th Avenue and the south end of Troy Street need to be provided with temporary cul -de -sacs for the turning of maintenance vehicles, school buses, and other types of large vehicles. ■ The Grading Plan does not show the proposed contours for the street construction. It only shows proposed centerline grades. These proposed contours are necessary to demonstrate the limits of construction and how this will affect the existing drainage and wetlands. For an example, the cul-de -sac at the east end of 198th Avenue is proposed to be filled and would be approximately 8 to 10 feet above the existing wetland to the north. Based on the City standard design for a cul -de -sac with side slopes, the proposed construction would impact the wetland. The final plat is missing several drainage easements for wetlands, treatment pond areas, and drainage swales. These are as follows: Block 1: • Lot 2: Treatment pond and drainage swale for pond. • Lot 5: Alternate mitigation site. • Lot 6: Alternate mitigation site. # Block 2: • Lot 1: Small wetland along east lot line. Block 3: • Lot 1: Weiland along street on north- (remainder of wetland being mitigated). • Lot 3: Treatment pond and drainage swale for pond. • Lot 5: Mitigation area. • Lot 7: Small wetland along the south lot line.