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1/ J Bonestroo gjj Rosene Anderlik& Ivlf Associates Engineers & Architects December 30,1998 Elizabeth VanZomeren City Planner/Zoning Administrator City of Orono Post Office Box 66 Crystal Bay, MN 55323 Re: Glenn Gronberg Subdivision File No. 139-2450 Bonestroo. Rosene. Andertlk ond Associates, tnc. Is on Affirmstive Action/Equoi Opportunity Employer Principots: Otto G Bonestroo. P.E. • Joiepri C. Anderlik. PE. • Marvin L • •'!. PE. • Richard E. Turner. PE. • Glenn R. Cook. PE. • Robert a Schunicht. PE • M Bourdon. PE. • Robert W. Rosene. P.E. and Susan M. Eberiia C.P.A.. Senior Consuitancs Associste Pnncipols: Howard A. Sanford. P-E. • Keith A. Gordon. PE. • ! ■ . Pfefferie. PE. • Richard W. Poster. PE. • David O. Loskota. RE. • Robert C Russek. A.t J H : A. Hanson. PX • Michael T. Raut-rarn. PE. • Ted K Field. PE. • Kenneth P. Anderson. PE !. RoJfs. PE. • Sidney P Williamson. PJL, LS. • Robert F. Koismith • Agnes M. Ring • Michael R Rau. PE • Allan Rick Schmidt RE Offices: Sf. Paul. Rochester. Wiiimar and St. Cloud. MN • Milwaukee. Wl Wedsite: wwwbonestroo.com Dear Liz: We have reviewed the preliminary plat for the proposed two-lot Gronberg subdivision. The site is located west of Willow Drive and north of Woodhaven Drive in the southeast quarter of Section 33. We have the following comments in regards to engineering matters. 1. Access: Access to the existing home on the property is across a private driveway located on Outlot A between the Gronberg site and Willow Drive. The existing driveway has a gravel surface and serves two other properties north of Outlot A. Access to the proposed Lot 1 would be across the existing driveway. The drawing that was submitted shows the proposed Lot 1 abutting Outlot A at a 25-foot width. To be consistent with City standards we recommend that Outlot A be extended westerly approximately 280 feet at a 50-foot width dong the south side of proposed Lot 2. A cul-de-sac should be constructed at the westerly end of Outlot A to provide room for emergency vehicle turning movements. The private driveway should be reconstructed to a minimum paved width of 24 feet to meet current City standards for a private street serving 3 to 6 units. Plans and specifications for any street improvements should be provided for review. Preliminary plans from MnDOT indicate that this property will be impacted by the proposed T.H. 12 realignment. Plans should be submitted to MnDOT for their review. 2. Grading: A grading and erosion control plan for the entire site should be submitted for review. Erosion control measures should be in place prior to any grading. Additional erosion control will be needed during construction of the house and septic system. 3. Drainage: A drainage area map and drainage calculations for pre and post development conditions should be submitted for review. Phosphorous loadings leaving the site should be limited to a maximum of 0.28 pounds/acre/year. Storm drainage impacts to Uie existing properties south of the site should be reviewed. Ponding does not appear to be practical on this site however, some sort of best management practice (BMP) such as vegetated buffer strips r:.zy be effective in treating runoff leaving the site. Plans should be submitted to the Minnehaha Creek Watershed District for their review 4. Easements: Drainage and utility easements should be provided 5 feet wide along all interior lot lines and 10 feet wide along the roadway right-of -ways. Drainage easements should be provided across any drainage ways. 5. Financial Guarantee: When the plans have been completed we can prepare an estimate of the total cost for the street improvements to determine the amount of the financial guarantee required if the City so desires. Please contact me at (604-4863) if you have any questions regarding this matter. Yours very truly, BONESTROO. ROSENE. ANDERLIK & ASSOCIATES. INC Tom Kellogg Cc: Greg Gaopa. City of Orono 2335 West Highway 36 • St. Paul, MN 55113 ■ 612-636-4600 ■ Fax: 612-636-1311