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TKDA ENGINEERS • ARCHITECTS • PLANNERS MEMORANDUM To: Copies To: James E. Studenski, P.E. 1500 Piper Jatfray Plaza 444 Cedar Street Saint Paul, MN 55101 -2140 (651) 292-4400 (651) 292-0083 Fax www.tkda.com Reference: Pomps Tire Drainage Review City of Lino Lakes, Minnesota From: Connie J. TailIon, P.E. Proj. No.: Date: December 2, 2005 Routing: The following drainage review is based on these submittals: 1. Geotechnical Evaluation Report prepared by Braun Intertec Corporation, dated October 26, 2005. 2. Midstates Tire and Tool, Inc. plan set prepared by Metro Land Surveying & Engineering, dated November 9, 2005. 3. Existing and Proposed HydroCAD models prepared by Metro Land Surveying & Engineering, dated November 2, 2005. 4. 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. 2. Use a curve number of 100 for the dead storage area of the wet pond and wetland in the HydroCAD model. 3. The n value for the existing 24" culvert under 74th street should be increased to 0.024 for corrugated metal pipe. 4. Define infiltration only above the normal water level for the proposed detention pond. 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 6. Update the plans to reflect the sharp- crested vee weir defined in the HydroCAD model for Pond 2P and Pond 3P. 7. Include the sharp- crested vee weir detail in the plans as dimensioned in the proposed conditions HydroCAD model for Pond 2P and Pond 3P. 8. Include details of the pond outlet baffle and bale check in the plan. 9. The high water levels indicated in the grading plan is inconsistent with the high water levels summarized in the HydroCAD model. Update the plan to reflect modeling results. 10. Expand the easement at the south comer of the proposed detention pond and add easement along storm sewer from the cul -de -sac to the proposed detention pond. 11. Submit a copy of the RCWD 05 -117 permit, RCWD 04 -100 permit, and the NPDES permit. An Employee Owned Company Promoting Affirmative Action and Equal Opportunity