09-15-1997 Planning Packet - Laserfiche WebLink

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Bone^rroo Rosene AnaerUk ATKJ AsfOciAret. tnc >s An Affirmative Action. BcfuAf Opportunity Bmptoyer PrincipAh Otto G Bon^stroo PE • Joseph C Anderlik. PF • M^^vin L Sorv.^M PP • Richard E Turner P£ • G'cnn R Cook PE • Robert G Schuncht. ®E • Jerry A Bourdon. PE • RoOert W Rosene PE and Susan M EDerim. C PA. Senior Consultants Asiociare PrincipAti Howard A Sanford PE • Keith A Gordon PE • Robert R Pfefferie. PE • Richard W Foster PE • David O Loskota. PE • Potert C Russes A ! A • Mark A Hanson. PE • Michael T Rautmann PE • Ted K F.eld PE • Kenneth P Anderson. PE • Mark R Rolfl. PE • Sidrscy P 'Viiiiamson. PE . L S • Robert F Rotsmitn Offices St Paul Rochester. Wiiimar and St Cloud mn • Milwaukee Wl 1/1 Bonestroo Rosene Anderlik & Associates Engineers & Architects September 8. 1997 Mr. Michael P. Gaffron Assistant Building and Zoning Administrator City of Orono Post Office Box 66 Crystal Bay, Minnesota 55323 Re: Garden Lane Site Plat File No. 139-2294 Dear Mike. We have reviewed the preliminary plat prepared for LGA Investment Group on the proposed Garden Lane Site, a seven- lot subdivision of Lot 2, Block 1, Heathercroft and Lot 90. Tonkaview Gardens, located west of Wildhurst Trail in the west half of Section 7. There are several issues that need to be addressed relative to engineering matters and included with the plan. 1. Utilities: The proposed sanitary sewer design appears acceptable hrom an engineering standpoint. Final plans should show service locations and elevations. The sanitary sewer along the west side of Wildhurst Trail will be difficult to construct due to the steep bank along the roadway. The sewer may be easier to install down the center of the roadway, and replace that section of pavement. 2. Streets: The proposed street location appears acceptable. Final plans should include horizontal and vertical curve data to verify the streets meet the requir^ 30-MPH design speed and 275-foot centerline radius. Final plans should also include a typical street section based on a geotechnical analysis of the site. The temporary cul-de-sac should be constructed as part of this project. A portion of this cul-de-sac is on City property. The City should determine if this is appropriate. We usually discourage islands in cul-de-sacs. A minimum of a 45-foot radius to the face of curb and 110 feet of right-of-way should be provided if islands are used. 3. Grading: Additional erosion control measures should be included between Lots 3 and 4, Block 2 for the sanitary sewer construction. All erosion control measures must be in place prior to any site grading. 4. Drainage: The outlet structure in the storm water basin should be sized to provide rate control so that post development flows do not exceed pre-development flows. Storm sewer and ponding calculations should be provided with the final plans. Final plans should be submitted to the Minnesota DNR and Minnehaha Creek Watershed District for their review and approval. 5. Easements: Easements should be provided for any existing utilities within the area to be vacated. 6. Financial Guarantee: We have attached an estimate of the cost for the site improvements and the amount of the required financial guarantee. Please contact me at this office if you have any questions regarding this matter. Yours very truly, BONESTROO. ROSENE. ANDERLIK & ASSOCIATES. INC. /<>yr7 F Tom Kellogg Cc: Greg Gappa, City of Orono 2335 West Highway 36 - St. Paul, MM 55113 ■ 612-636-4600 ■ Fax; 612-636-1311