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TKDA • ENGINEERS • ARCHITECTS • PLANNERS MEMORANDUM 1500 Piper Jaffray Plaza 444 Cedar Street Saint Paul, MN 55101 -2140 (651) 292 -4400 (651) 292 -0083 Fax www.tkda.com To: Thomas D. Prew, P.E. Reference: The Preserve Development Drainage Review Copies To: James E. Studenski, P.E. City of Lino Lakes, Minnesota From: Connie J. Taillon, P.E. (, 1 1 Proj. No.: 13604.009 Date: July 25, 2006 Routing: The following review is based on these submittals: 1. Responses to drainage review comments submitted by McCombs Frank Roos Associates, Inc., dated June 12, 2006. 2. Grading and Erosion Control Plan, submitted by McCombs Frank Roos Associates, Inc., dated April 10, 2006, and revised July 12, 2006. 3. Grading and Erosion Control Notes, submitted by McCombs Frank Roos Associates, Inc., dated • April 10, 2006. 4. Storm Sewer Plan and Profile, submitted by McCombs Frank Roos Associates, Inc., dated July 6, 2006. 5. Geotechnical Report submitted by Interstate Geotechnical Engineering, Inc., dated May 24, 2006. The following comments are from TKDA's previous memos. New comments are in bold and identify items that need to be addressed. Drainage Review Comments: 1. The preliminary geotechnical report concludes that ground water is found between 0' to 8.4' and has potential to fluctuate upward as much as 3.5' to 4.25'. It may be difficult to maintain groundwater separation from the storm sewer. Alternative solutions must be provided to maintain groundwater separation. 06/02/06 Provide an anticipated high ground water elevation. Low floor elevations shall be 4' above the anticipated high ground water elevation. NPDES standards require 3' of separation between the bottom of infiltration basin 4P and seasonally saturated soils. 7/25/06 The lowest floor elevation shall be 4 feet above the highest anticipated water table which is identified as mottled soils or the seasonally high water mark. An Employee Owned Company Promoting Affirmative Action and Equal Opportunity