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TKDA • ENGINEERS • ARCHITECTS • PLANNERS MEMORANDUM 1500 Piper Jattray Plaza 444 Cedar Street Saint Paul, MN 55101 -2140 (651) 292-4400 (651) 292-0083 Fax www.tkda.com To: James E. Studenski, P.E. Reference: Pheasant Stroll Estates Copies To: Drainage Review City of Lino Lakes, Minnesota From: Connie J. TailIon, P.E. Proj. No.: 13604.007 Date: March 22, 2006 Routing: The following drainage review is based on these submittals: 1. Pheasant Stroll Estates Preliminary Grading, Utility, and Erosion Control Plans submitted by Plowe Engineering, Inc., dated January 30, 2006. Pheasant Stroll Estates preliminary drainage calculations submitted by Plowe Engineering, Inc., dated January 27, 2006. 3. Pheasant Stroll Estates Geotechnical Evaluation Report submitted by Braun Intertec Corporation, dated January 17, 2006. 111 4. Pheasant Stroll Estates Wetland Delineation Report submitted by Earth Science Associates, Inc., dated December 15, 2005. Drainage Review Comments: 1. A 16.5 foot minimum wetland buffer of native wetland or prairie vegetation is required from..the delineated edge of wetland to the lawn areas. A sedimentation forebay or grit chamber should be provided at the inlet of the proposed infiltration basin to prevent accelerated decay of the infiltration capacity of the basin due to clogging. 3. If the street will be City owned and maintained, then the curb cut for the infiltration area is not allowed. Consider installing slot drains in the curb. 4: Please justify the existing conditions curve number for the pervious areas. The wooded areas do not appear to be included in the calculation. 5. The existing wetland 4 invert elevation indicated in the HydroCAD model appears to be off by a factor of 100. 6. Provide adequate inlet capacity for CB -1 and CB -2 in order to maintain the equivalent of one 12 foot lane in the event that the low point becomes flooded. 7. The pond outlets pipes will need to be designed so that pipe full velocities are between 4 and 6 fps. 8. City of Lino Lakes standard details for catch basins and catch basin/manholes call for a minimum cover of 4 feet from top of pipe to gutter, unless a perforated drain is added. The minimum cover for a manhole with a perforated drain is 2' -6" from top of pipe to gutter. • 9. Include a `rip rap at RCP outlet' detail in the plans. An Employee Owned Company Promoting Affirmative Action and Equal Opportunity