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7/29/2019 35W Tunnel Presentation - Bonding Request
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City of MinneapolisI-35W North & South Storm Tunnel
S.F. 194
35W South Tunnel Outfall 35W North Tunnel Outfall
7/29/2019 35W Tunnel Presentation - Bonding Request
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35W North TunnelConstructed 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 TunnelConstructed 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
7/29/2019 35W Tunnel Presentation - Bonding Request
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35W North Tunnel Tunnel built to accommodate citystorm water that was originally draining
to the sanitary system and freewaydrainage Agreements between the City ofMinneapolis and MnDOT regarding thetunnel construction and maintenance
35W South Tunnel Original flow - west to east to theMississippi River Freeway bisected the original flowpattern Tunnel built to accommodate city andfreeway drainage Agreements between the City ofMinneapolis and MnDOT regarding thetunnel construction and maintenance
7/29/2019 35W Tunnel Presentation - Bonding Request
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Current Bonding Request2012 $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.
Current Bonding Request2013 $4.5 million State, $4.5 million Local
7/29/2019 35W Tunnel Presentation - Bonding Request
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Deficiencies to beAddressed
Groundwater Longitudinal Cracks
Liner FailureVoids outside the tunnel
Holes in the Liner
Groundwater Longitudinal Cracks
Liner FailureVoids outside the tunnel
Holes in the Liner
7/29/2019 35W Tunnel Presentation - Bonding Request
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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
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
7/29/2019 35W Tunnel Presentation - Bonding Request
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City of MinneapolisI-35W North & South Storm Tunnel
Need to manage the condition before it becomes asafety issue
The City of Minneapolis needs to continue to takerain water out of the sanitary system and into thestorm water system to avoid Combined SewerOverflows (CSO) and to meet the requirements ofthe Metropolitan Council Environmental Services(MCES) Inflow and Infiltration (I/I) Program
MnDOT supports this work and funding request
Need to manage the condition before it becomes asafety issue
The City of Minneapolis needs to continue to takerain water out of the sanitary system and into thestorm water system to avoid Combined SewerOverflows (CSO) and to meet the requirements ofthe Metropolitan Council Environmental Services(MCES) Inflow and Infiltration (I/I) Program
MnDOT supports this work and funding request