Transcript Force main
Metropolitan Council Public Information Meeting Hopkins – St. Louis Park – Minneapolis Regional Sanitary Sewer Improvements Draft Facility Plan January 20, 2010 Bill Moeller – MCES Assistant General Manager Bill Cook – MCES Engineering Services Manager Scott Dentz – MCES Interceptor Engineering Manager Adam Gordon – MCES Project Manager Tim O’Donnell – MCES Senior Information Coordinator Bill Lueck – Project Manager, CDM consulting engineers Jodi Polzin – Project Manager, CDM consulting engineers 1. Overview of Regional Wastewater System 2. Overview of Project Facility Plan Existing Facilities and Conditions Alternatives Recommendations and Schedule Public Participation 3. Question & Answer/Open House Anoka Washington Hennepin St. Croix Valley Ramsey Metro Blue Lake Seneca Carver Eagles Point Hastings Empire Scott Dakota Conveyance – Facilities used to move wastewater (includes pumps, pipes and sewers) Force main – A pressure pipe in which wastewater is conveyed with the use of pumps (pump station) Gravity sewer – A pipe that is constructed with a continuous drop in elevation to convey flow Temporary conveyance – A temporary wastewater conveyance pipe typically run above ground and permits the existing pipe to be drained, cleaned, inspected, and repaired Interceptor – A force main or gravity sewer that intercepts wastewater from multiple communities and conveys it to one of the regional wastewater treatment plants. Increase pumping station capacity to accommodate growth and improve efficiency Correct known problems Construct redundant facilities to allow condition assessment and repair MCES L27 Pump Station ◦ Constructed in 1971 ◦ Receives all wastewater generated in Hopkins MCES 7026 Sanitary Force Main ◦ Five mile long force main between L27 and 27th Street and Humboldt Avenue South in Minneapolis City Pump Stations ◦ Three pump stations serving nearly 20% of St. Louis Park ◦ One pump station serving an area near Lake of the Isles in Minneapolis Current Average, mgd Ultimate Peak, mgd Average, mgd Peak, mgd Hopkins (L-27) 1.6 4.6 2.3 6.3 St. Louis Park (LS1, LS19, LS2) 1.0 3.2 1.4 4.2 0.01 0.04 0.01 0.04 2.6 7.0 3.7 9.3 Minneapolis (L-5) Total The L-27 lift station has reached its useful life expectancy and maintenance issues in conjunction with the need to increase its capacity warrant consideration of replacement. Age, operating conditions, unknown pipe condition, and previous repairs warrant improvements to force main 7026. Facility Plan Goals Recommend Interceptor Sewer Corridor Identify Type of Interceptor Sewer Facilities (Pumping/Gravity) Evaluate Alternative Sites for Pump Station Location Develop a Plan for Interceptor Sewer Construction 3) To 1-MN-341 via Force Main Insufficient Capacity Not Considered Further 2) To 1-MN-344 via Force Main Third Highest Cost To Blue Lake WWTP 1-MN-344 1) To Blue Lake WWTP via Force Main Second Highest Cost Capacity Reserved for Existing Service Area 5) To 1-MN-330 via Force Main Lowest Cost Least Disruption No Redirection of Local Connections 4) To 1-MN-330 via Gravity Highest Cost Most Disruption Most Difficult Construction No Redirection of Local Connections To Blue Lake WWTP 1-MN-344 Alternative Phase 1 Phase 2 1 Rehabilitate existing force main w/ temporary conveyance Construct parallel, redundant force main 2 Construct parallel, redundant force main w/ temporary conveyance Rehabilitate existing force main 3 Construct dual pipe force main w/ temporary conveyance Abandon existing force main Provide short term assurance that the interceptor system is providing reliable service Replace previously repaired sections of force main Relocate inaccessible force main Reline remaining force main Install a redundant force main New Force Main Install New Force Main Rehabilitated Force Main Abandoned Force Main Abandon Force Main Reline Remaining Force Main New Force Main Existing Force Main Cost Effective Available Property Site Compatibility ◦ Land Use ◦ Adjacent Land Use Environmental Issues ◦ Flood Plain and Wetland Proximity ◦ Environmental Contamination Recreational Impact Transportation Disruption Lowest Cost for Full Replacement Options Existing Infrastructure Conveys Hopkins Wastewater to this Location MCES Currently Owns and Operates Existing Site as a Pump Station City Suggested Site For L-27 Head House Wet Well Tunnel Project Construction Schedule 2010 2010-2011 Minnehaha Creek 2010-2012 Minneapolis – Phase 1 2011-2014 L-27 Reconstruction 2011-2015 Hopkins/Saint Louis Park – Phase 1 2011-2015 Highway 100 – Phase 1&2 As Required Hopkins/Saint Louis Park – Phase 2 As Required Minneapolis – Phase 2 2011 2012 2013 2014 2015 2016 through 2020 Lift Station/Force Main Segment Capital Cost L-27 $9,700,000 West Saint Louis Park Highway 100 $14,100,000 $4,700,000 East Saint Louis Park $11,100,000 Minneapolis $24,000,000 Total Estimated Cost $63,600,000 The estimated cost includes construction cost, design and administration, land acquisition, and contingencies. Metropolitan Council projects are funded by bonds and Public Facilities Authority Loans, which are paid by regional sewer connection fees & user charges. One-time increase of $150.01 per unit for new connection to sewer system (SAC) $1.35 increase per year per household regionwide for 20 years (based on average annual water usage) No assessment by Metropolitan Council Copies of Draft Facility Plan available for review Hopkins City Hall Hopkins Library St. Louis Park City Hall St. Louis Park Library Kenwood Community Center Metropolitan Council’s Data Center Three Public Information Meetings Public Hearing Comments will be incorporated into the Final Facility Plan. Facility Plan Schedule Written comments 02/08/2010 due no later than Full Metropolitan Council 02/24/2010 Approval Submit Facility Plan to MPCA 03/01/2010 MPCA Public Notice of EAW to follow Facility Plan Approval Public Comments Submit comments no later than February 8, 2010. Submit comments to Tim O’Donnell, MCES Senior Information Coordinator, by: Email comments to: [email protected] Send written comments to: Tim O’Donnell at Metropolitan Council Environmental Services, 390 Robert Street North, St. Paul, MN 55101 Fax comments to Tim O’Donnell at 651-6021477 Record comments on Metropolitan Council Public Comment Line at 651-602-1500 Send TTY comments to 651-291-0904