06/14/2006 P&Z Packet - Laserfiche WebLink

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• • TKDA ENGINEERS • ARCHITECTS • PLANNERS MEMORANDUM 1500 Piper Jaffrey 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. Proj. No.: 13604.009 Date: June 2, 2006 Routing: The following remarks in bold are based on these submittals: 1. Responses to preliminary drainage review comments submitted by McCombs Frank Roos Associates, Inc. dated May 22, 2006. 2. Preliminary Grading and Erosion Control Plan, submitted by McCombs Frank Roos Associates, Inc. dated April 10, 2006, and revised May 22, 2006. 3. Geotechnical Report submitted by Interstate Geotechnical Engineering, Inc. dated May 24, 2006. 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. A 4' (minimum) separation is provided between the groundwater and the basement floor elevations (Lots located in Block 6 and 7 have been raised to meet this requirement). 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. 1. The City suggests locating roadway low points to provide emergency overflow routes along side property lines. An emergency overflow has been established at the low point on Pheasant Run South and Killdeer Drive. Item has been addressed. An Employee Owned Company Promoting Affirmative Action and Equal Opportunity