Albany Park Stormwater Diversion Tunnel

Public Meeting April 2, 2015

Albany Park Stormwater Diversion Tunnel

Agenda

Introduction and Flooding History Alternatives Considered Proposed Project Construction Potential Impacts Questions

Albany Park Stormwater Diversion Tunnel

Previous Meetings •

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May 29 2013: Albany Park Flood Workshop. Attended by: Alderman Laurino, the City of Chicago Department of Water Management, IEMA, FEMA, IDNR, and Representative John D'Amico's staff. April 1 2014: North River Commission. CDOT presented the tunnel concept and a tentative Project schedule. October 30, 2014: NGO Meeting. Attended by: Friends of the Chicago River, Metropolitan Planning Commission, and Sierra Club.

Outreach for today’s meetings included: 39th Ward Alderman Margaret Laurino. 33rd Ward Alderman Deb Mell 40th Ward Alderman Patrick O’Connor 47th Ward Alderman Ameya Pawar

Eugene Field Advisory Council Albany Park Neighbors Association Gompers Park Advisory Council North River Commission North Mayfair Improvement.

Albany Park Stormwater Diversion Tunnel

Introduction - Flooding

NBCR = North Branch of Chicago River NSC = North Shore Channel Albany Avenue Stream Gauge on NBCR exceeded flood stage: • September 2008* • July 2010 • April 2013* *Significant Flooding Events

Introduction – 1% Annual Chance Flood Event

Albany Park Stormwater Diversion Tunnel

Source of Flood Boundary: Detailed Watershed Plan (January 2011) Note: 336 structures impacted in Albany Park neighborhood

Albany Park Stormwater Diversion Tunnel

Introduction - 2013 Flood

Introduction – Overbank Flooding in Introduction - Flooding Albany Park Neighborhood The purpose of this project is to alleviate overbank flooding along the NBCR in the Albany Park neighborhood.

Albany Park Stormwater Diversion Tunnel

Albany Park Stormwater Diversion Tunnel

Alternatives Considered Alternatives Considered But Dismissed • Remove North Branch Dam • Modify Ridgeway Bridge (Eugene Field Park) • Add Upstream Storage Alternatives Analyzed • Floodwall (DWP) • Buyouts • Floodproofing Structures • Diversion Tunnel

Alternatives Considered – Introduction - Flooding Floodwall or Buyouts

Albany Park Stormwater Diversion Tunnel

Alternatives Considered – Introduction - Flooding Floodproof Structures •

Install wall or berm surrounding the structure with sliding gates or stoplogs at access points

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Reinforce basement windows

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Install gates in exterior doorframes

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Install pumps

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Add backflow protection.

Albany Park Stormwater Diversion Tunnel

Proposed Project – Introduction - Flooding Plan View

Albany Park Stormwater Diversion Tunnel

Proposed Project – Introduction - Flooding Profile View

Albany Park Stormwater Diversion Tunnel

Proposed Project – Introduction - Flooding Inlet Plan View

Albany Park Stormwater Diversion Tunnel

Proposed Project – Introduction - Flooding Inlet Cross Section View

Albany Park Stormwater Diversion Tunnel

Proposed Project – Introduction - Flooding Inlet 3-D Model (no water)

Albany Park Stormwater Diversion Tunnel

Proposed Project – Introduction - Flooding Inlet 3-D Model (1% Annual Chance Flood)

Albany Park Stormwater Diversion Tunnel

*Roughly 45/55% Split Between River and  Diversion Tunnel for the 1% Annual Chance Flood

To Diversion  Tunnel

Proposed Project – Introduction - Flooding Outlet Plan View

Albany Park Stormwater Diversion Tunnel

Proposed Project – Introduction - Flooding Outlet Cross Section View

Albany Park Stormwater Diversion Tunnel

Proposed Project – Introduction - Flooding Outlet 3-D Model (no water)

Albany Park Stormwater Diversion Tunnel

Proposed Project – Outlet 3-D Model Introduction - Flooding (1% Annual Chance Flood)

From  Diversion  Tunnel

Albany Park Stormwater Diversion Tunnel

Proposed Project – Hydraulic Profile of Introduction - Flooding NBCR Upstream of Dam (1% Annual Chance Flood)

Albany Park Stormwater Diversion Tunnel

Proposed Project – Hydraulic Profile of Introduction - Flooding NBCR and NSC Below Dam (1% Annual Chance Flood)

Albany Park Stormwater Diversion Tunnel

Proposed Project – Introduction - Flooding Outlet Control Building

Albany Park Stormwater Diversion Tunnel

Construction – General Sequence Part 1 (Site Preparation) SITE PREPARATION • Mobilize • Traffic control • Construction fencing • Re-route pedestrian pathways • Water treatment system • Utilities • Signage • Erosion control • Protect existing trees • Clear and grub

Albany Park Stormwater Diversion Tunnel

Construction – General Sequence Part 1 Bike Path Detour

Albany Park Stormwater Diversion Tunnel

Construction – General Sequence Part 2 (Tunnel Construction) 1. 2. 3. 4. 5. 6. 7. 8.

TUNNEL CONSTRUCTION Excavate starter shaft at Outlet site (River Park) Excavate starter tunnel Set up tunnel boring machine (TBM) Excavate rock tunnel with TBM Excavate shaft at Inlet site Complete tunnel and remove TBM Clean tunnel Install tunnel liner

Albany Park Stormwater Diversion Tunnel

Construction – General Sequence Part 2 (Tunnel Construction)

Albany Park Stormwater Diversion Tunnel

Construction – General Sequence Part 3 INLET AND OUTLET STRUCTURES and SITE RESTORATION • Install sheet pile at the Inlet site • Excavate inlet structure • Construct inlet structure • Excavate outlet structure • Construct outlet structure • Install pumps and controls • Restore Site (planting, seeding, trails, lights, ball fields, etc.) • Demobilize

Albany Park Stormwater Diversion Tunnel

Potential Impacts & Permits •

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Albany Park Stormwater Diversion Tunnel

Joint Permit Application – Section 404 and Section 10 – United States Army Corps of Engineers – Floodplain – Illinois Department of Natural Resources – Section 401 Water Quality Certification – Illinois Environmental Protection Agency – State-protected species - IDNR EcoCAT query – Soil Erosion and Sedimentation Control – Soil and Water Conservation District – Federally protected species – United States Fish and Wildlife Service – Historic and Archaeological Resources – Illinois Historic Preservation Agency – Boater Safety – United States Coast Guard MWRD Facility Connection Permit City of Chicago – Stormwater – Harbor Permit – Office of Underground Construction Non-Governmental Organizations

Potential Impacts & Permits – Priority Topics

Albany Park Stormwater Diversion Tunnel

Dissolved Oxygen (mg/L)

1. Aquatic Resources Fish Impacts – impingement and entrainment Fish Populations – historically limited, but recently improving Banded killifish present downstream of dam CDOT is updating a fisheries impact analysis at the request of IDNR 2. Water Quality Dissolved oxygen DO Sag Curve ‐ Albany Park Tunnel 10 IEPA Section 401 WQC - ongoing 9 8 3. Archaeological Resources 7 6 Phase I survey this spring 5 4 3 4. Recreation 2 1 Adaptive management plan 0 0 1 2 3 4 5 6 7 8 9 10 Boater safety time (days)

Potential Impacts & Permits Temporary Construction Impacts

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Soil Erosion and Sedimentation Control Water treatment plant Traffic Noise Pathway rerouting Use of Chicago Park District land Hours of operation Schedule

Albany Park Stormwater Diversion Tunnel

Questions and Discussion

Questions? Vasile Jurca, CDOT [email protected]

Albany Park Stormwater Diversion Tunnel

Albany Park Stormwater Diversion Tunnel

Albany Park Stormwater Diversion Tunnel

BACKUP HYDRAULIC SLIDES

Albany Park Stormwater Diversion Tunnel

Proposed Project - Hydraulics

4

INLET

1

OUTLET

2 3

5 6

Albany Park Stormwater Diversion Tunnel

Proposed Project - Hydraulics

Albany Park Stormwater Diversion Tunnel

Proposed Project - Hydraulics JB

Slide 39 JB3

Add NBCR to legend for with and without project and combined flow cuves Justin Bartels, 3/31/2015

Albany Park Stormwater Diversion Tunnel

Proposed Project - Hydraulics

Inlet Location

Outlet Location