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TKDA ENGINEERS • ARCHITECTS • PLANNERS • MEMORANDUM To: Copies To: James E. Studenski, P.E. From: Connie J. Taillon, P.E. Date: January 23, 2006 Reference: Pomps Tire Proj. No.: Routing: 1500 Piper Jaffray Plaza 444 Cedar Street Saint Paul, MN 55101 -2140 (651) 292-4400 (651) 292 -0083 Fax www.tkda.co.m Drainage Review City of Lino Lakes, Minnesota 13604.006 Remarks in bold are based on responses submitted by Metro Land Surveying & Engineering, dated January 4, 2006, and the following submittals: 1. Midstates Tire and Tool, Inc. plan set prepared by Metro Land Surveying & Engineering, dated January 4, 2006. 2. Existing and Proposed HydroCAD models prepared by Metro Land Surveying & Engineering, dated January 5, 2006. 3. Proposed drainage plan prepared by Metro Land Surveying & Engineering, dated November 2, 2005. • Drainage Review Comments: 1. Include off -site drainage entering the proposed pond via an existing culvert located under Jon Avenue. Include this drainage in the hydrologic analysis of the site. No further comment. 2. Use a curve number of 100 for the dead storage area of the wet pond and wetland in the HydroCAD model. No further comment. 3. The n value for the existing 24" culvert under 74th street should be increased to 0.024 for corrugated metal pipe. No further comment. 4. Define infiltration only above the normal water level for the proposed detention pond. Set the infiltration invert elevation to 898.0 (NWL) for pond 2P. 5. Based on the infiltration guidance document prepared by RCWD, an infiltration rate of 0.25in/hr (.0003472 ft/min) should be used for Type B soils. An infiltration rate of 0.25 in /hr should be used for pond 2P. 6. Update the plans to reflect the sharp- crested vee weir defined in the HydroCAD model for Pond 2P and Pond 3P. An Employee Owned Company Promoting Affirmative Action and Equal Opportunity