01/12/2005 P&Z Packet - Laserfiche WebLink

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Engineering Review of New Brighton Page 2 January 6, 2005 Kingdom Hall Jehovah's Witnesses 7. "Drainage Computations using HydroCAD" stormwater runoff, routing and ponding computer modeling for 2 -Year, 10 -Year, and 100 -Year design rainfall events as provided by Pioneer Engineering (Rodney Gordon, P.E.) dated October 4, 2004, stamped received in Lino Lakes City offices on December 17, 2004 (19 pages). 8. Site Plan Sheets for "New Brighton Kingdome Hall" as provided by Pioneer Engineering and signed by Rodney Gordon, P.E.: a. Drainage Plan (1 plan sheet) dated December 17, 2004. b. Attachment "A" (1 plan sheet) dated December 17, 2004. c. Erosion Control Plan (1 plan sheet) dated December 17, 2004. d. Grading Plan (1 plan sheet) dated December 22, 2004. e. Site Plan (1 plan sheet) dated December 17, 2004. All of the above plan sheets were stamped received at the City of Lino Lakes offices on December 17, 2004, except for the Grading Plan which was stamped received on December 22, 2004. Engineering Review Comments: Easement Issues: • The submitted easements are to be described by their function or type. Show and/or label the easement(s) on the grading, site, drainage, and erosion control plans. • As a minimum, a ten (10) -foot wide easement (D & U) parallel and along the Lake Drive right - of -way will be required. Also, a five (5) foot wide easement will (D & U) along the side lot lines of the parcel will be required. 2. Provide the Lino Lakes City Engineer with a copy of the requirements with approvals from the Anoka County Highway Access Permit process for driveway access onto a County road. The City will need to review the Anoka County requirements and may have further requirements. 3. Stormwater System Issues: The stormwater drainage calculations are generally the same documents that were previously reviewed as part of a Lino Lakes engineering review(s) from November 1 and 4, 2004. In general, the plans with the revised stormwater system do not coincide with the HydroCAD storm modeling report. The flood/peak elevations in the HydroCAD report do not match the pond elevations as shown on the plans. Storm piping is calculated in the HydroCAD model, but none is shown on the plans. That is, the plans and the HydroCAD calculations must be reconciled using the following requirements: a. The drainage divide area map for existing and proposed conditions must be labeled to coincide with the HydroCAD storm modeling calculations for the 2 -Year, 10 -Year, and 100 -Year design rainfall events. 411 b. While using NRCS type "A" soils for the pre - development (existing) conditions is acceptable, it is required that NRSC type `B" soils are used for the proposed development conditions.