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M Bonestroo Rosene Anderlik & Associates Engineers & Architects Decembers, 1999 Pjretroo. ffose^ a-c-"/- n a* e^jiCppcnuntt/ Pnncfp^t: Otto C Bcneitroo. Pt • Jolfph C Antferli*. BS • Varwin l Pf. • C.*e*^h ft. Cook. • acoer: G ScsjaicM. • Jc'ry A iourdcn. • BoO«ft W Be lent. PI. i?icr’A'3 I Tcrrtr. PI, src S^js^n V* Eaerim. CPA. Senior Consultants Aifoc»Afr Pr/ncpair Howard A Sanford. P£. • <e»tfi A Gordon. P.E. • »ooert B. Prcfftrit. PE. • Ricnjrd W. Foster. PE • David O Coikota. PE • desert C. Roisek. A i A • .Mark A. Hanson. PE. • Michael T Raui.-Tiami. FE • Pi • ne-retn P ArdeMon. PS • Mark P Polfs. Pf. • Sidney P WiiiuVhson. PE LS. • Pooert F Kots/ritr • Ajres M. Pmg • Allan Pick Schmidt. PX Of fleet: St- Paul. Pccheste'. Wiiirrar and St Cloud. VN • .Milwaukee. Wi Weoiitc WWW doneit'oo com Honorable Mayor and City Council City of Orono PO Box 66 Crystal Bay MN 55323-0066 Re: Feasibility Report East Long Lake Sanitary Sewer File No. 139-99-105 Dear Mayor and Council: As directed by City staff, we have reviewed the existing conditions and the possible sanitary sewer service to the East Long Lake area in Orono. The properties are located along Old Long Lake Road and East Long Lake Road near the east shore of Long Lake as shown on Figure 1 . The area consists of ten residential units and a City of Orono park. All residences are served by on-site septic systems. The City Park has no sewer system and is currently served by out houses. Current City records indicate the following septic system status for the ten residential units. • 3 units Failing systems • 2 units Non-compliant systems • 4 units Compliant systems • 1 unit Compliance unknown The units with failing systems have no alternate septic sites existing on the property. Two sanitary sewer options were studied as part of this report. The first option is a gravity sewer system as shown on Figure 2. The gravity sewer would be installed in the roadway and will require the complete street reconstruction. Flows will be routed to a lift station that will be constructed on the City Park property near the existing parking lot. Flows would be then be pumped from the lift station to an existing manhole on Old Long Lake Road in the City of Long Lake. The property identified as # 6 on Figure 2 would need to be served by a grinder pump due to the low elevation of the home. All other properties would be served by gravity. The would be restored to its original grade and section. Disturbed lawns would be regraded and restored with sod. The second option is to install a pressure sewer system to serve all eleven properties as shown on Figure 3. With this option a small diameter (2”-3") forcemain would be installed along the edge of the roadways. The forcemain would outlet into an existing manhole on Old Long Lake Road in the City of Long Lake. Individual grinder pumps would be required to serve each of the eleven properties. Services would be extended from the common forcemain to the property lines at a location determined by the property owner. Property owners would be responsible for me cost of the sewer installation between the sewer stub at their property line and their home. Al disturbed areas would be restored as part of the project cost. This option would require minima