Agenda - Council - 02/28/1995 - Laserfiche WebLink

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I I I ! I I I I I I I I I I I I I I I in the soutl3ern portion of the plat has been delineated. It appears that construction of Cobalt (cui~,ently shown as 150th) will require placement of the pavement ail on one side of the fight-of-way in the vicinity of the wetland to avoid construction in the wetland. After avoiding that portion of wetland, it appears that the pavement can then swing to the center of the rightlof way again to avoid removal of trees along the front property line of Lot 12, Block 3, Gcrham's Sandy Acres. Barium Street exceeds the 600 foot maximum length for dead-end streets; however, this is to be considered a temporary situation until the property to the north develops. The east/w~st street, which will be 149th, has been proposed with an outlet onto Hwy. #47. In accordance with comments from Mn/DOT, the closing of of the access north of 152nd on t~e west side of Hwy. #47 will be pursued in conjunction with the new outlet onto Hwy.#47 as a result of the development of Willow Ridge. It is Staffs understanding that the developer has applied to Mn/DOT for a fight of access permit. Also in accordance with prelirr~nary comments from Mn/DOT, the developer is proposing to dedicate 50 feet of right-of-/vay from the centerline of Hwy. #47. Drainage: A drainage and grading plan dated January 17, 1995 has been prepared by Ross Abel P.E. ~An area of 4.2 acres located on the northeast portion of the site drains to a proposed w~t pond which would be created in a natural low area on the northeast corner of the site. This area would have an overflow which would discharge to a landlocked natural pond imme~ately adjacent to the eastern boundary of the site. The drainage plan should be amended to !include a high water overflow from this natural pond into a sedimentation basin located on ithe southeast corner of the site which would in mm overflow into DNR Protected Wetland 659. Wetland 659 has an outlet which begins discharging when its water level reaches its ordinary high water (OHW) designation into a storm sewer in 149th Avenue which discharges into the Rum River. A 2.3 acre area which drains Cobalt Street south of Barium Street drains into the man-made sedimentation basin and then to the wetland system described above. The remaining 6.7 acres on the northwest portion of the site drains from a storm sewer system constructed in Barium Street to a man-made sedimentation/detention pond located on the northwestern corner of Wetland 659 and then into the above-mentioned wetland system. Calculations should be submitted to predict what the increased bounce from a 10-year and 100-year storm would have on Wetland 659. .Utilities: The developer is proposing to install the public improvements (streets, storm sewer, sewer and water) with no financial participation on the part of the City. Sanitary sewer shall be extended throughout the plat. A 12-inch interceptor main shall be continued albng Barium Street. All other sanitary sewer mains shall be eight inches. Water service sha~l be extended to the site by extending a 12-inch watermain from where it currently temainates on 149th Lane N.W. 1200 feet east of T.H. #47 to the intersection of Barium and ~i'.H. #47 and then looping this main south along the east side of T.H. #47 into Amber Ridge. The cost of this looping will be credited to the d.~veloper's trunk utilities assessments Water service within the subdivision streets shall be 8-inch mains.