06-08-1998 Council Packet - Laserfiche WebLink

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Bonestroo Rosene Anderlik & Associates Engineers & Architects Mav 26, lyys Bo* uroo. Rosene. Anaerhk jtnd AssocuUes. Inc is ^ Atttrm^i:;\e Action Equ,*t Opportunity Employer Pr pWs Otto G Bonestroo. PE • Joseph C Anderlik. PE. • Mdrvin L Sofv«il«i. PE • RichardE Turre . PE • Glenn R Cook. PE • Robert G Schunicht. PE • Jerry A Bourdon PE • Robert W Rosene, PE ^nd Susan M Eberlm. C PA Senior Consultants Afjoc/Pfe Pr/nr/pa/s Howard A. Sanford. PE • Keith A Gordon. PE • Robert R Pfefferle. PE • Richard W Foster. PE • David O Loskota. PE • Robert C Russek. A I A • Mark A Hanson. PE • M'Chael T Rauimann. PE • Ted K Field. P£ • Kenneth P Anderson. PE • Mark R Rolfs. PE • Sidney P Williamson. PE . I S • Robert F. Kotsmirh • Agnes M Ring • Michael P Rau. PE • Allan Rick Schmidt. PE Offices St Paul. Rochester. Wiiimar and St Cloud. MN • Milwaukee W» Website wwwbonestroo com F Mr. Michael T. Gaffron Ssnior Plannir.c Coordina'or City of Oion.-> Post on ice *3 or. 60 Crvsta* Bay, MN .S5.^23 Re:Render Subdivision File No. 139-2339 Dear Mike: We have reviewed the revised plat and grading plan for the proposed ihrce-Iot .subdivision for James Render. Tlie site IS located at 1365 Tonkawa Drive (C.R.135) north of North Shore Dr:vc (C.R.51) in the southeast quarter of Section 8. We have the following comments in regards to enginceiing matters: The revised plat appears to correctly show all previously requested easements. The grading plan shows a berm along the east side of the pond. The HWL elevation of the pond is shown at 932.5. We recommend that the proposed berm elevation be set at an elevation of 933.0 and include a riprapped emergency spillway at an elevation equal to the HWL (932.5). The plan set should include a detail of the outlet control structurc/baffled weir. The outlet structure should provide one foot of skimming to remove floatables and debris. The proposed road is centered in the right-of-way at the west end and shifted to the southerly edge of the right-of- wa> at the east end. We recommend that the road be centered in the right-of-way for the entire length to provide adequate room for construction a.nd snow storage. The purpose of the pond is to provide water quality for storm drainage from the site, especially drainage due to hardcover. 1 he proposed street section is a rural section with ditches on both sides. It appears that storm drainage oi* the sou<’n of the roadway will shed to the south ditch, travel easterly to the 15-inch CMP, and then flow nordicr’iv to tire l'!ce, completely bypassing the pond. The street should be designed so that, at a minimum, all flows from m:- io?.dv/ay are directed to the pond. A revised drainage area map and drainage calculations should be subir.i:i«*.d fof review. Iiascr.v.T.1 e'e^'eticn? shown on Lots 2 and 3 provide less than the minimum recommended freeboard of 2 feet above tht*. Do.r.d HWL. The Minnehaha Creek Watershed District should review and comment on the proposed grading (;r;ifi;n^ 2 2nd 3 should be revi.sed so that runoff from Lot 3 is directed away from the proposed basement o.n Let 2. We ha ,-.«. Miiis-tc.'. die total cost for site improvements at $43,500. The cost estimate is attached for your review. A tinarciu! su.nr,'’.ntee of 150 percent of the estimate or $65,250 should be provided to the City. Please contact me at 60c-'»a63 if you have any questions. Yours very t.'"jly, BONESTROO. ROSENE, ANDERLIu & ASSOCIATES, INC. CC- Greg Gappa, City of Orcnc 2335 West Highway 36 ■ St. Paul, MN 55113 ■ 612-636-4600 • Fax: 612-636-1311