05-18-1998 Planning Packet - Laserfiche WebLink

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1/ i Bonestroo Rosene Anderlik & Associates Engineers & Architects May 15, 1998 Mr. Michael P. Gaffron Senior Planning Coordinator City of Orono Post Office Box 66 Crystal Bay, MN 55323 Re: Waade Subdivision File No. 139-2340 C-l Bonestroo. Rosene. Anderlik jnd Assoc/^tes. irc is AffirivMive Action Equ,v Opportunity Employer Principals Otto G Bonestroo, PE • Joseph C Anderlik. PE • Marvin l Sorvala. PE • Richard E Turner. PE • Glenn R CooV. PE • RcDerf G Schunicht, PE • Jerry A Bourdon. PE • Rouert W Rosene. PE and Susan M EDerlm, C PA Senior Cor»sui!ants Assccicfte Principals Howard A Sanford. PE • Kenn A Gordon. PE • Robert R. Pfcfferle. PE • Richard W Foster. PE • David O Loskota. PE • Robert C Russek. A IA • .Mark A Hanson. PE • Michael T Rautmann. PE • Ted K Field PE • Ker'neth P Anderson. PE • Mark R Rolfs. PE • Sidney P Williamson. PE, L S • Robert F Kotsmith • Agnes M Ring • Michael P Rau. PE • Allan RiCk Schmidt. PE Offices St Paul. Rochester. Willmar and St Cloud MN • Milwaukee. W' WePsite WWW bonestroo com Dear Mike: We have reviewed the revised plat, revised grading plan and drainage calculations for the proposed two lot Waade subdivision. The site is located at 3280 and 3290 Northshore Drive (C.R. 51) east of Tonkawa Road (C.R. 135) in the southeast quarter of Section 8. We have the following comments in regards to engineering matters. 1. Access: Ple.ise see our M ch 19, 1998 comments as they still apply. 2. Utilities: Please see our March 19. 1998 comments as they still apply. 3. Grading r.nd Drainage: The revised grading plan shows a proposed 932.0 contour along the east lot line of the property northeast of the future twinhome. If the pond renebes the overflow elevation of 932.5 shown on the grading plan, storm water will be routed through this low area towards the existing properties located east of the site. We 'ecotnmend that the giading plan be revised so that flow': are directed northerly towards the lake away from the existing ho:r.:s. ’I he drainage area map indicates that approximately 0.5 acres of the site that previously drained easterly will t»ow flow noitherly to the lake. This will reduce off-site flows onto the properties to the cast but may compound any existing drainage problems east of the site. Storm water to the east of the site may reach greater deptits because there will be less area to pond after a rainfall. The City should review any existing drainage problems east of the subject property as the proposed site grading may limit or restrict any future drainage solutions. A recently submitted revised plat does show the access road shifted westerly away from the existing home as previously reouested. A revised grading plan showing proposed grading along the existing home and street should be submitted for review. The drainage calculations appear acceptable. The pond outlet should provide 1 foot of skimming for watei quality purposes. An cutlet structure detail should be provided for review. It is assumed that both homes will be slab-op-grade construction so that the proposed lowest floor elevations (935.0) will be more than •he ieuu;re<l iTi'nitnuni of 2 feet above the pond HWL (931.66). 4. o'W'mciits: Tlie recently submitted revised plat appears to correctly show the 20 foot utility easement along the exisiir.g sanitary scv.er on the west side of the lot. 5. Finunciat Guarantee: V/ben the olans have been completed we will prepare an estimate of the total cost for the site improvsir.enti to determine the amount of the financial guarantee required. Please contact me at (604-4863) if you have any questions regarding this matter. Yours very truly, BONESTROO. ROSENE. ANDERLIK & ASSOCIATES, INC. r-.n, V.ll-.nnTom Kellogg Cc: Greg Gappa. City of Orono 2335 West Highway 36 - St. Paul, MN 55113 ■ 612-636-4600 • Fax; 612-636-1311