CCP 05-12-1997 - Laserfiche WebLink

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I I., adjacent to West Round Lake Road. I The storm water detention requirements for the public right -of-way drainage areas were based I upon the lOO-year, 5-inch rainfall; while water quality requirements are based upon a 2-inch rainfall. These storm designs result in approximately 1.35 acre-feet of storage required for water quality purposes and 3.44 acre-feet of storage for rate control. A total pond volume of I approximately 3.5 acre-feet could be accommodated within the I -acre area presented on Exhibit 7. A more cost-effective alternate for the City of Arden Hills would be to accommodate all, or a I portion of, the storm runoff from the roadways within the individual site ponding requirements. According to the District's storm drainage requirements, individual parcels must provide adequate I storm water detention volume to meet both storm water quality and rate control requirements. Additional volume available within these sites could feasibly reduce the City's overall I requirements for the 3.5 acre-feet of storage. I Project costs associated with the recommended storm drainage requirements are estimated at $347,000, as presented in the cost section of this report. The cost could be reduced by up to .e $60,000 through the consolidation of storm water treatment/storage areas within individual parcels, thereby reducing the City's pending requirements and pipe sizes necessary to carry higher flows. I Commercial Roadways I It has been proposed by City staff to provide an enhanced entry into the Gateway Business District I with some form of upgraded roadway and/or "boulevard" style design. As a result of those concepts, this section of the report outlines two alternates for the roadway design. As presented I on Exhibit 8, it is proposed to construct the segment of West Round Lake Road from Highway 96 to 13th Street NE as a Municipal State Aid Street, possibly utilizing MSAS funds. The I proposed roadway along the Minnesota Transfer rail spur would be constructed as a typical commercial street, designed in accordance with Arden Hills design standards. I Traffic counts were obtained at the north end of West Round Lake Road during the first week of I May, 1997. The two-day, 24-hour counts resulted in average daily traffic (ADT) volumes of 2,400 vehicles per day, and showed a large volume of high capacity trips as well. Additionally, .- the traffic generation volumes presented by the developer will be used to project the ultimate development's trip generation for use in the final pavement design. Those volumes are in the I range of _ to _ vehicles per day. Using MnDOT's guidelines for MSAS road design, -7- FEAS-520,089 520-089-10