08-24-1998 Council Packet - Laserfiche WebLink

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Bonestroo Rosene Anderlik & Associates Bon^iiroo Rosene. Anderhk ^nd Assocuires. Inc is an Aff^rr-arive Act.on, Equal Opportunity Employer Principals Otto G Bonestroo. P£ • Joseph C. A.-!Cerif< P£ • Vjrvn L SorvaM. P£ • Pichard E Turner. PE. • Gfenn R Coox. PE • RotJert G Schu'^icnt. PE • Jerry A Bourdon. PE. • Rotiert W Rosene. PE and Susan M Eoerlm. C PA . Sertor Consultants Associate Principals Howard A Sanford. PE • Ke't.h A Gcrion. PE • Robe^’f R P'efferlc. PE. • Richard W Foster. PE. • David O Loskota. P£ • RoDe't C Pussex. A IA • Mark A. Hanson. PE. • Michael T. Rauimann. PE • Ted K.Fieid. PE • Kenneth P Anderson. PE • Mark R. Rolfs. PE. • Sidney P Williamson. PE. L S • Robert F Kotsmitn • Agnes M Ring • Michael P Rau, PE. • Allan Rick Schmidt. PE Engineers & Architects August 24,1998 Offices: St Paul. Rochester. Wiiimar and St Cloud. M\' • v»iwauXee. Wi Wedstte WWW bonestroo com Honorable Mayor and City Council City of Orono PO Box 66 Crystal Bay MN 55323-0066 Re: Feasibility Report Head Property Sanitary Sewer FUe No. 139-GEN Dear Mayor and Council: As directed by City staff, we have reviewed tht existing conditions and the possible sanitary sewer service to the Head property in Orono. The property is located on Crystal Bay, north of Minnetonka Beach and west of C.R. 15 (Shoreline Drive) near the Areola bridge as shown on Figure 1. Most of the property is relatively flat, elevated just one to two feet above the NWL (929.6) of the lake. There are two existing residences located on the property. Both residences are served by on-site septic systems. The systems are currently non-conforming and no alternate septic sites exist on the property. It is proposed that sewer improvements to the Head property include the installation of a residential grinder station and forcemain as shown on Figure 2. As part of the project, a 4-inch HDPE pipe would be directionally bored southerly under the lake to an existing gravity manhole at the intersection of Shoreline I^ve and Beach Lane in Mirmetonka Beach. The 4-inch pipe would serve as a conduit for a 2-inch forcemain that would carry flows from the Head property to the existing manhole. The conduit would provide a margin of safety against forcemain leaks and allow for future forcemain maintenance without re-boring the line. Beach Lane will be excavated around the existing manhole to make the forcemain connection. The street would be restored to its original grade and section. Disturbed lawns would be regraded and restored with sod. The project will require the approval of the Minnesota Department of Natural Resources (MN DNR). Permits will be requir^ from Hennepin County, Minnesota Pollution Control Agency and the MN DNR. The construction of the sanitary sewer to serve the Head property is feasible from an engineering standpoint. The project is necessary because of the non-conforming septic systems and potential pollution problems. The capital cost as well as operation and maintenance costs have been considered in determining that the project is cost effective. The cost of these improvements are interrelated and should be assigned to the Head property. The following recommendations are presented for consideration by the Orono City Council: 2335 West Highway 36 • St. Paul. MN 55113 - 612-636-4600 • Fax: 612-636-1311