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• TKDA ENGINEERS • ARCHITECTS • PLANNERS MEMORANDUM 444 Cedar Street. Suite 150D Saint Paul, MN 55101 -214D (651) 292 -4400 (651) 292 -0093 Fax www.tkda.com To: Matthew Woodruff, P.E. Reference: Main Street Village Copies To: James E. Studenski, P.E. Drainage Review City of Lino Lakes, Minnesota Proj. No.: 13810.011 From: Connie J. Taillon, P.E. Routing: Date: November 19, 2007 The following drainage review is based on these submittals: 1. Main Street Village Preliminary Grading and Erosion Control Plan, and Utility Plan, submitted by Pioneer Engineering, dated September 26, 2007. 2. Main Street Village Stormwater Management Plan submitted by Pioneer Engineering, dated September 25, 2007. New comments are in bold and identify items that need to be addressed. IllThe 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. Clarify if the first floor elevations labeled on the Plans are also the lowest floor elevations. • 11/19/07 This item has been addressed. The following are minor plan, calculations, and drafting corrections that must be addressed prior to final approval: 1. The pond outlet pipes are required to be a minimum of 15 inches in diameter. 11/19/07 This item has been addressed. 2. 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. 11/19/07 Label the overflow location and elevation of biofiltration basin I7 and the wetland mitigation area on the Grading Plan. 3. 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. An Employee Owned Company Promoting Affirmative Action and Equal Opportunity