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HomeMy WebLinkAbout5G Accepting Plans and Specs for 2011 Sanitary Sewer ImprovementsPRIG\ U 4646 Dakota Street SE `nvNSSO��' Prior Lake. NIN 55372 CITY COUNCIL AGENDA REPORT MEETING DATE: APRIL 4, 2011 AGENDA #: 5G PREPARED BY: JOE WIITA, STREET AND UTILITIES SUPERVISOR PRESENTER: JOE WIITA AGENDA ITEM: CONSIDER APPROVAL OF A RESOLUTION ACCEPTING PLANS AND SPECIFICATIONS AND AUTHORIZING STAFF TO SOLICIT QUOTES FOR THE 2011 SANITARY SEWER IMPROVEMENTS DISCUSSION: Introduction The purpose of this agenda is for the City Council to consider approval of the plans and specifications and authorize staff to solicit quotes for the 2011 sani- tary sewer improvements. Hi story The City of Prior Lake maintains more than a 100 miles of sanitary sewer mains that collect and convey sewage to the Met Council Sewer Interceptor. This system includes nearly 8,000 sewer services and 39 sanitary sewer lift stations. Annually the City proactively completes improvements to the infra- structure to ensure that it operates efficiently and correctly. Failure to main- tain this infrastructure can result in sewage backups and substantial impacts to private property. The City's annual maintenance program is detailed in the Sanitary Sewer Maintenance Program. This annual maintenance is required to meet the League of Minnesota's insurance requirements and reduces the City's liability. These projects allow the City to minimize and prevent the inflow of ground water into the City's sanitary sewer system and maintain the integrity of the City's sanitary sewer system. By minimizing this inflow the City minimizes sewer treatment costs with the Met Council. The annual improvements include sewer pipe lining, sewer main replacement and lift station improvements. The City previously adopted a Standardized Comprehensive Management and Rehabilitation Plan for the purchase of standardized equipment for Lift Stations. Because the City Maintains 39 lift stations that provide critical sanitary sewer services to property owners. The equipment for these facilities has been standardized to allow for efficient emergency response and maintenance. On February 22, 2011 the City Council authorized staff to prepare plans and specifications for the 2011 Sanitary Sewer Improvements which include the Watersedge lift station and forcemain to be completed in conjunction with the 2011 Street Reconstruction Project. Current Circumstances For 2011 City staff has identified replacement of the existing sewer pipe that runs under the lake between the southern terminus of Watersedge Trail and the northern terminus of Glendale Avenue. This improvement will be com- pleted in conjunction with phase 1 of the Boudin's /Rutgers Neighborhood im- provements. Currently the sewer runs under the lake via an "inverted siphon" sewer main constructed in 1975. This sewer serves more than 300 homes in that area of the City. Over the last several years the City has experienced several sewer back -ups due to the malfunction of the siphon. Siphon's were used in the 1970's as a primary way to cross rivers and streams prior to lift station tech- nology becoming preferred. Due to minimal grades this siphon does not oper- ate efficiently and has very high maintenance costs. Replacing the siphon with a forcemain under the lake will allow the City to lower the existing sewer in the Boudin's /Rustic Neighborhood to provide better flow and protection to residences. This option will also allow the City to preserve the siphon as an emergency forcemain thus providing an emergency alternative for sewer ser- vice that does not currently exist in this area of the City. Conclusion Because the City is reconstructing Watersedge Trail in 2011 it is appropriate to make the improvements to the sanitary sewer lake crossing concurrently to eliminate current sewer back -up issues and provide long term dependable sewer service to this area. If authorized to move forward, staff would solicit quotes and return to Council for approval as quotes are received in order with the project. All work for this project will be completed by September 1, 2011. ISSUES: If the City does not make this upgrade in conjunction with the 2011 Recon- struction Project the City will most likely need to tear up a portion of the re- constructed Watersedge Trail to make repairs in the next 10 years. Without replacing the crossing, the existing sewer grade issues can't be repaired and back up issues will continue. FINANCIAL IM- City staff will act as general contractor and supply all components and equip - PACT: ment based on the Lift Station Standardization process. Contacted services for this project which include directional drilling and lift station excavation are estimated to be less than $100,000 and therefore a minimum of 2 quotes are required. The standardized equipment to be installed by the City includes the prefabricated lift station and piping components. None of the City installed standardized lift station equipment purchases will exceed $100,000 and there- fore will be quoted. The 2011 Budget identifies $150,000 for sanitary sewer system improvements and $60,000 for lift station panel and equipment installation which will not be exceeded with this project. ALTERNATIVES: 1) Approve a resolution accepting plans and specifications and authorizing staff to solicit quotes for work to be completed as part of the 2011 Sanitary Sewer Improvement Project. 2) Table this item for a specific reason and provide staff with direction. 3) Direct Staff not to proceed with the project. RECOMMENDED Alternative No. 1. Br 2 PRip+i' � U � 7C 4646 Dakota Street SE '�OMxcso' N Prior Lake, N 55372 RESOLUTION 11 -xxx A RESOLUTION APPROVING PLANS AND SPECIFICATIONS AND AUTHORIZING STAFF TO SOLICIT QUOTES FOR THE 2011 SANITARY SEWER IMPROVEMENTS Motion By: Second By: WHEREAS, The City of Prior Lake maintains more than 100 miles of sanitary sewer main, nearly 8,000 sewer connections and 39 sanitary sewer lift stations; and WHEREAS, In order to keep the system functioning properly and to meet League of Minnesota Insurance guidelines and Met Council inflow requirements the City annually repairs and replaces sections of its sanitary sewer system: and WHEREAS, Phase 1 of the Boudin /Rutgers Neighborhood reconstruction project requires sewer improvements to the existing sewer running under the lake; and, WHEREAS, City Staff recommends the existing inverted siphon utilized between the southern terminus of Watersedge Trail and Glendale Avenue be replaced in conjunction with those improvements; and WHEREAS, The replacement of this crossing will reduce the potential of sewage backup issues; and eliminate the need for future impacts to reconstructed streets for replacement of the sewer. NOW THEREFORE, BE IT HEREBY RESOLVED BY THE CITY COUNCIL OF PRIOR LAKE, MINNESOTA as follows: 1. The recitals set forth above are incorporated herein. 2. The City Council approves the plans and specifications for the 2011 Sanitary Sewer improvements and authorizes staff to solicit quotes. PASSED AND ADOPTED THIS 4th DAY OF APRIL, 2011. YES NO M ser M ser Erickson Erickson Hedberg Hedber Keeney Keene Soukup Souku Frank Boyles, City Manager