08/08/2007 P&Z Packet - Laserfiche WebLink

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TKDA • ENGINEERS • ARCHITEC I S • PLANNERS • MEMORANDUM To: Thomas D. Prew, P.E. Reference: Main Street Village 444 Cedar Street, Suite 1500 Saint Paul, MN 55101 -2140 (651) 292 -4400 (651) 292 -0083 Fax www.tkda.com Copies To: James E. Studenski, P.E. Drainage Review Proj. No.: From: Connie J. Taillon, P.E. Routing: Date: July 17, 2007 The following drainage review is based on these submittals: City of Lino Lakes, Minnesota 13810.011 1. Main Street Village Preliminary Grading and Erosion Control Plan, and Utility Plan, submitted by Pioneer Engineering, dated May 3, 2007. 2. Main Street Village Stormwater Management Plan submitted by Pioneer Engineering, dated July 10, 2007. New comments are in bold and identify items that need to be addressed. The following are significant issues that must be addressed prior to Preliminary Plat approval: 1. The Geotechnical Report does not indicate the seasonal high ground water elevations for the site, which is identified as the mottled soils or highest anticipated ground table. Provide documentation indicating the highest anticipated groundwater elevation. The lowest floor elevations are required to be 4 feet above the seasonal high groundwater elevation. 2. Clarify if the first floor elevations labeled on the Plans are also the lowest floor elevations. The following are minor plan, calculations, and drafting corrections that must be addressed prior to final approval: 1. Provide 1 foot contour intervals on the Grading Plan as required in the I -35E Corridor AUAR. 07/17/07 This item has been addressed. 2. Update the infiltration rate for Pond W 1: West Wetland in the existing conditions model. 07/17/07 This item has been addressed. 3. The pond outlet pipes are required to be a minimum of 15 inches in diameter. 4. Indicate the overland overflow elevations for all infiltration basins, ponds, and low points in the parking areas on the Grading Plan. Low openings are required to be 1 foot above the overflow elevations. Many of the infiltration basins have multiple overflows (storm sewer inlets) as shown on the Plans; however, the infiltration basins are modeled as having only one primary outlet. For example, infiltration basin IA5 appears to have two overflows (catch basins), yet the infiltration basin is modeled as having only 1 primary outlet (1.50'x1' horizontal orifice /grate). Please clarify. 05 An Empioyee Owned Company Promoting Affirmative Action and Equal Opportunity