11/28/2005 Council Packet (2) - Laserfiche WebLink

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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: James E. Studenski, P.E. Reference: Pine Glen Copies To: Drainage Review Responses City of Lino Lakes, Minnesota From: Connie J. Taillon, P.E. Proj. No.: 13265.002 Date: November, 8, 2005 Routing: Remarks in bold are based on responses submitted by LSJ Engineering, Inc. dated October 21, 2005 and the following submittals: 1. Pine Glen Preliminary Plans as submitted by LSJ Engineering, Inc. dated October 18, 2005 and stamped received in Lino Lakes on October 25, 2005. 2 Pine Glen Runoff Calculations as submitted by LSJ Engineering, Inc. dated October 17, 2005 and stamped received in Lino Lakes on October 25, 2005. The following drainage review is based on these submittals: 1. Pine Glen Preliminary Plans as submitted by LSJ Engineering. Stamped received in Lino Lakes on July 7, 2005. 2. Pine Glen Runoff Calculations as submitted by LSJ Engineering, Inc. Stamped received in Lino Lakes on July 7, 2005. Drainage Review Comments: 1. Include the existing wetland to the east of the site in the HydroCAD models and indicate the 100 -year elevation and emergency overflow elevation on the plans. The low floor elevation of the adjacent houses is required to be a minimum of 2 feet above the 100 -year elevation and 4 feet above the ground water table. The low opening of the adjacent houses is required to be a minimum of 1 foot above the emergency overflow. It is recommended that Lots 4 and 5, Block 5 low floor elevations be a minimum of 2 feet above the positive overflow elevation of the wetland (the 100 -year high water level of the wetland is not known). 2. Provide low opening elevation designations for all lots. 3. Provide emergency overflows for all ponds and label the locations and elevations on the plan. Low openings for adjacent buildings are required to be a minimum of 1 foot above the emergency overflow. Label the positive overflow elevation for infiltration area #2 and pond #6 on the grading plan. 4. Based on current HydroCAD model results, lots 27 and 28, block 4 have low floor elevations less than 2 feet above the 100 -year elevation for Pond #1. Please clarify. 5. Based on current HydroCAD model results, lots 16 -21, block 4 have low floor elevations less than 2 feet above the 100 -year elevation for Infiltration Pond #2. Please clarify. An Employee Owned Company Promoting Affirmative Action and Equal Opportunity - 4 7 -