09/14/2005 P&Z Packet - 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 Calculation Review City of Lino Lakes, Minnesota From: Connie J. Taillon, P.E. Proj. No.: 13265.002 Date: August 5, 2005 Routing: 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: 01. 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. 2. 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. 3. 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. 4. 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. 5. Based on current HydroCAD model results, lot 33, block 1 has a low floor elevation less than 2 feet above the 100 -year elevation for Pond #3. Please clarify. 6. Based on current HydroCAD model results, lots 13, 16, and 18, block 1 have low floor elevations less than 2 feet above the 100 -year elevation for Infiltration Pond #4. Please clarify. 7. Based on current HydroCAD model results, lots 3 -6, block 3 have low floor elevations less than 2 feet above the 100 -year elevation for Pond #6. Please clarify. 8. Based on current HydroCAD model results, lots 1 -9, block 4 have low floor elevations less than 2 • feet above the 100 -year elevation for Infiltration Pond #7. Please clarify. 9. Determine the 100 -year elevation for the low area upstream of the culvert draining subcatchment P 1- OFF. An Employee Owned Company Promoting Affirmative Action and Equal Opportunity