02-17-1998 Planning Packet - Laserfiche WebLink

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Bonesrroo. Roicne. Andcrtik AaoctMcs. Inc if Affirm^ive Acfon, Bqu.V Opportunity Employer Principals Olio G BoncstfOO. PE • Joseph C Anderlik. PE . M^rvm L Sorv.iM. PE . Turner. PE • Glenn R Cook. PE • Robert G Schumchi. PE • Jerry A Bourdon, PE • PE €?nd bus^n M Eberltn. C PA . Senior Consulldnts Richard E Robert W Rosene Associate Principals Howard A Sanford. PE • Keith A Gordon, PE • Robert R Pfefferlc. PE • Richard W Foster. PE • David O Loskoia. PE. • Robert C Russek. Al A . Mark A Hanson. PE Michael T Rautmann. PE • Ted K Field PE • Kenneth P Ande»^son. PE • Mark R Rolfs. RE. • Sidney P Williamson. PE . L S • Robert F Koismith Offices. St Paul. Rochester. Wiilmar and St Cloud. MN • Milwaukee Wi Bonestroo Rosene Anderlik & Associates Engineers & Architects January 12. 1998 Mr. Michael P. Gaffron, Senior Planning Coordinator City of Orono Post Office Box 66 Crystal Bay, Minnesota 55323 Re: Orono Development, L.L.C. File No. 139-2327 Dear Mike, We have reviewed the site plan for the proposed commercial development located on the east side of Shadywood Road (CSAH 19). north of Navarre Lane and Shoreline Drive (CSAH 15) in Navarre. The development includes a full service bank with drive-up auto tellers and a single story retail office complex. There are several engineering issues that will need to be addressed as part of the plan review process. f • Traffic. The site plan shows two accesses onto Shadywood Road. The south access is very close to the signalized intersection. This access will create problems with traffic on the county roads and we would recommend that the site be served with only one access at a location further north of the intersection. As a minimum we would suggest that the south access be restricted to only right-turn in/right-tum out movements. Left turn movements should only be made at the north access. Hennepin County traffic engineers should review the site plan to determine the traffic impacts on CSAH 19. Their review should include the proposed access locations, work within the existing right-of-way. and whether or not additional right-of-way is needed in this vicinity. The proposed signing along CSAH 19 may create sight restrictions for traffic leaving the site. Details should be provided for pylon signs and entrance monuments. 2. Grading: It appears that the design grades at the northerly access and in several areas within the parking lot meet or exceed 5 percent which may create problems. We would recommend that access and parking lot grades not exceed 4 percent. Slopes along the north and west sides of the site are shown as steep as 1.5.1. Maintenance may be difficult if slopes are steeper than 3:1. Fiber blanket or comparable erosion control material should be used untii vegetation is established. The proposed retaining wall is over 10 leet tall in some locations. Retaining wall design and details should be provided for review. Fencing will likely be required above the wall for safety purposes. 3. Drainage: The NURP pond expansion should provide a 10:1 bench at the NWL around the entire pond to promote the establishment of aquatic vegetation. T.ie 12 inch storm sewer at 13.8 percent grade outletting to the pond create an erosion problem. We recommend less grade on the pipe so that velocides do not exceed 12 feet per second or the installation of a surge basin. Storm sewer and ponding calculations should be provided for our review. The plans should be submitted to the Minnehaha Creek Watershed District for their review and approval. 4. Utilities: The existing sanitary sewer and water main to serv'e this property are located within the right- of-way for Navarre Lane. Plans and specifications should be prepared for the service line connections, with as-built plans provided to the City upon completion. 2335 West Highway 36 ■ St. Paul, MN 55113 ■ 612-636*4600 • Fax; 612-636-1311