1 / 7

City of Minneapolis I-35W North & South Storm Tunnel S.F. 194

City of Minneapolis I-35W North & South Storm Tunnel S.F. 194. 35W North Tunnel Outfall. 35W South Tunnel Outfall. 35W North Tunnel Constructed in 1965 Material – concrete (not reinforced) 8 – 14 foot diameter 9,415 feet / 1.8 miles in length Roughly 80 – 100 feet below the surface

jaegar
Download Presentation

City of Minneapolis I-35W North & South Storm Tunnel S.F. 194

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. City of MinneapolisI-35W North & South Storm TunnelS.F. 194 35W North Tunnel Outfall 35W South Tunnel Outfall

  2. 35W North Tunnel Constructed in 1965 Material – concrete (not reinforced) 8 – 14 foot diameter 9,415 feet / 1.8 miles in length Roughly 80 – 100 feet below the surface 62% Minneapolis Flow / 38% MnDOT Flow Funding need $5.5 million 35W South Tunnel Constructed 1961 to 1964 Material – concrete (not reinforced) 8 – 14 foot diameter 24,540 feet / 4.7 miles in length Roughly 80 – 100 feet below the surface 85% Minneapolis Flow / 15% MnDOT Flow Funding need - $14 million

  3. 35W North Tunnel Tunnel built to accommodate city storm water that was originally draining to the sanitary system and freeway drainage Agreements between the City of Minneapolis and MnDOT regarding the tunnel construction and maintenance 35W South Tunnel Original flow - west to east to the Mississippi River Freeway bisected the original flow pattern Tunnel built to accommodate city and freeway drainage Agreements between the City of Minneapolis and MnDOT regarding the tunnel construction and maintenance

  4. Current Bonding Request 2013 $4.5 million State, $4.5 million Local Current Bonding Request 2012 $4.5 million State, $4.5 million Local * Request based on 2006 Tunnel Condition Assessment Report which identified segments of the tunnel and cost estimates.

  5. Groundwater Longitudinal Cracks Groundwater Longitudinal Cracks Holes in the Liner Holes in the Liner Deficiencies to be Addressed Voids outside the tunnel Voids outside the tunnel Liner Failure Liner Failure

  6. Solutions • Removing sedimentation and debris from the tunnel • Sealing open joints, fractures, and cracks • Repairing holes and erosion in the tunnel liner • Grouting voids outside of the liner City of MinneapolisI-35W North & South Storm Tunnel Solutions Removing sedimentation and debris from the tunnel Sealing open joints, fractures, and cracks Repairing holes and erosion in the tunnel liner Grouting voids outside of the liner

  7. Need to manage the condition before it becomes a safety issue • The City of Minneapolis needs to continue to take rain water out of the sanitary system and into the storm water system to avoid Combined Sewer Overflows (CSO) and to meet the requirements of the Metropolitan Council Environmental Services (MCES) Inflow and Infiltration (I/I) Program • MnDOT supports this work and funding request City of MinneapolisI-35W North & South Storm Tunnel Need to manage the condition before it becomes a safety issue The City of Minneapolis needs to continue to take rain water out of the sanitary system and into the storm water system to avoid Combined Sewer Overflows (CSO) and to meet the requirements of the Metropolitan Council Environmental Services (MCES) Inflow and Infiltration (I/I) Program MnDOT supports this work and funding request

More Related