04/10/2002 P&Z Minutes - Laserfiche WebLink

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Planning & Zoning Board April 10, 2002 Page 10 APPROVED MINUTES Staff stated Officer Mike Rumpsa prepared a review on January 21, 2002. He expressed concern with the additional traffic load on Bi rch Street, particularly with morning rush hour traffic. Staff stated a landscaping plan for screen ing along Birch Street had been submitted as required. The plan consisted of a combina tion of deciduous and coniferous trees. The City’s Environmental Specialist was recommending replacement of the proposed Colorado Spruce with White Spruce. Staff indicated the City’s Environmental Board reviewed the request on March 27, 2002, and recommended denial of th e request citing the need to submit plans to the St. Paul Regional Water Utility and the Vadnais Lakes Watershed District. They also submitted recommendation to consider if the proposal was approved. Staff stated the developer had made applic ation to the RCWD for approval of a Land Development Plan and a Wetland Alteration Pl an. The application was scheduled for review by the District on April 24, 2002. It wa s City policy to withhold any development approvals until the RCWD has approved, at a minimum, a TWAFAA (Tabled with Authorization for Administrative Action). Staff indicated the County was preparing comments with regard to the proposed subdivision and impact on Birch Street. It was staff’s recommendation that improvements to Birch Street, adjacent to the project site, might be required by the County. Staff stated they had received by fax t oday a letter from Anoka County Highway Department expressing their concern with th e safety issues that may occur on CSAH 10 as a result of this development. Staff stated a preliminary review by the City Engineer indicated the final construction plans would need to be designed to City St andards. City Standards for storm sewer, sanitary sewer, and watermain would need to be shown in the plans. The detail for the outlet control structure called for a treated lumber weir. The weir would need to be concrete. The City’s design standards for storm sewer were minimum full velocity – 3 fps; minimum mainline storm sewer size – 15” RC pipe; minimum culvert size – 15” RC pipe. The submitted design seemed to use a minimum full velocity of 2.5 fps and minimum pipe size of 12” RC pipe. The City ’s Local Water Management Plan called for ponds to be built with a 15 foot, 10:1 side slope bench. The pond detail submitted showed a 10-foot, 10:1 side slope bench. This detail would need to be corrected and the proposed pond adjusted to a 15-foot wide be nch. Supporting information regarding soil types and land uses used to determine the curve numbers would need to be submitted. An SCS TR-55 method should be used to dete rmine the Time of C oncentrations, not the Lag method. Pond 6 was landlocked, according to the model. The 100-year floor elevation for the pond would need to be de termined allowing for a 100-year snowmelt, 10-day runoff of 7.2 inches and a Curve Number of 100. Groundwater information was not provided. The City’s Local Water Mana gement plan called for the minimum floor elevation, including basement to be 4 f eet above the groundwater, 4 feet above the normal water level, or 2 feet above the 100-year flood elevation, whichever was greatest.