04-19-1999 Planning Packet - Laserfiche WebLink

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Bonestroo. Roscne. AnderUk jind Associates, me. is an Affirmative Action/Equal Opportunity Employer Principals: Otto G. Bonestroo. PE. • Joseph C Anderhk. PE. • Marvin L Sorvala. PE. • Richard E. TUrner. RE. • Glenn R. Cook. PE. • Robert G. Schunicht. PE. • Jerry A. Bourdon. PE. • Robert W Rosene. RE and Susan M. Eberlln. C PA.. Senior Consultants Associate Principals: Howard A. Sanford. PE. • Keith A. Gordon. PE. • Robert R Pfefferle. PE. • Richard W. Poster. PE. • David O. Lojhc'a. P£ • Robert C Russek. A.I.A. • Mark A. Hanson. PE. • Michael T. Rautmann. PE. • Ted KJleld. PE. • Kersneth P Anderson. PE. • Mark R. Rolfs. PE. • Sidney P. Williamson. PX. LS. • Robert F. Kotsmith • Agnes M. Ring • Michael P Rau. RE. • Allan Rick Schmidt. PE. Offices: St. Paul. Rochester. Wiiimar and St. Cloud, mini • Milwaukee. Wl Website: www bonestroo com APR 0 6 1999 Ci i Y o,- ^ J Bonestroo «?osene Anderlik & j\\\ Associates Engineers & Architects April 5,1999 Elizabeth VanZomeren City Planner/Zoning Administrator City of Orono Post OfQce Box 66 Crystal Bay. MN 55323 Re: Crystal Bay Preserve FDeNo. 139-2477 Dear Liz: We have reviewed the preliminary plat for the proposed Crystal Bay Preserve eight-lot subdivision. The site is located east of Old Crystal Bay Road and north of the Luce Line Trail in the in the northeast quarter of Section 23. We have the following comments in regards to engineering matters. 1. Access: The proposed access location off from Old Crystal Bay Road appears acc^table. Plans should be submitted to Hennepin County for their review. The proposed street section for the roadway will need to be 28 feet in width to meet City standards for a private street serving 7 or more units. The street should be designed so that water from the private road is diverted away from C.R. 84. Final plans should include geotechnical recommendations and street design including horizontal and vertical curve information. 2. Grading: A grading and erosion control plan for the entire site should be submitted for review. It appears that the driveway to serve Lot 3 will need to cross the existing ditch. The ditch serves as a drainage way for an existing pond located north of this site. Driveway co.TStruction to serve this lot should not impede flows through the existing ditch. It is assumed but not stated that the existing buildings in the southwest corner of the site will be removed. Final plans should identify all structures to be removed. Erosion control measures should be in place prior to any gra^ng. particularly along the wetland. Additional erosion control will be needed during construction of the houses and septic systems. 3. Drainage: The draft version of the City ’s’ Comprehensive Storm Water Management Plan (SWMP) shows that the site lies within the French Lake drainage district. The site drains southerly to an existing wetland located along the south edge of the property. Storm water from north of this site also drains to this wetland. These flows from the nor^ are currently routed to the wetland through the existing ditch located along the eastern edge of the property. The ditch section should be evaluated relative to erosion potential. If flows will continue to be routed through the ditch, some type of ditch stabilization may be required to prevent excessive scouring and additional erosion. An alternative to ditch stabilization would be to install storm sewer to convey flows from north of the site to the proposed NURP pond. These flows should be included when sizing the NURP pond. Our records indicate that the southerly outlet for the existing wetland is a 36-inch diameter pipe under the Luce Line Trail. F 2335 West Highway 36 ■ St. Paul, MN 55113 - 651-636-4600 • Fax: 651-636-1311