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Metropolitan Tunnel Redundancy Program Update

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Presentation on theme: "Metropolitan Tunnel Redundancy Program Update"— Presentation transcript:

1 Metropolitan Tunnel Redundancy Program Update
Kathy Murtagh Director, Tunnel Redundancy June 4, 2019

2 Pressure Aqueduct/Tunnel System (1939- 1976)
Weston Aqueduct Cochituate Sudbury Reservoir Chestnut Hill Quabbin City Tunnel Extension Dorchester Wachusett Chicopee Valley Carrol WTP Quabbin Aqueduct Metropolitan Tunnel System Hultman Aqueduct Chicopee Valley Aqueduct Cosgrove Tunnel

3 MetroWest Water Supply Tunnel (2003)
Weston Aqueduct Cochituate Sudbury Reservoir Chestnut Hill Quabbin Aqueduct Quabbin Hultman Tunnel City Extension Dorchester Wachusett Cosgrove Chicopee Valley 17.6 mile, 12 to 14 foot diameter, deep rock pressure tunnel was brought on-line in November 2003 Provides Redundancy to the Hultman Aqueduct Carrol WTP MetroWest Tunnel

4 Metropolitan Tunnel System
Carroll Water Treatment Plant Dorchester Tunnel Shaft 7 City Tunnel Extension City Tunnel Shaft 5/5A No Redundancy East of Shaft 5 Norumbega Tank

5 Condition of the Metropolitan Tunnel System
Concrete-lined deep rock pressure tunnels Steel and concrete lined vertical shafts Surface pipe, valves and appurtenances Little maintenance required for tunnels and shafts. Little risk of failure Pipe, valves and appurtenances need maintenance, rehabilitation, replacement

6 Valve Reliability Concern
Valves that don’t work Valves we can’t operate Shaft 8 Shaft 8 Shaft 8 PRV Chamber

7 The Great Water Main Break of May 2010
Small pipe failures can lead to big problems < 1” 250 MGD flow at Shaft 5 break…. …came from a small gap in the pipe

8 Economic Impact of Water Supply Loss
The estimated economic loss of water supply within the Boston Metropolitan area is: ~$208 million per day to businesses ~$102 million per day residents total economic impact of ~ $310 M per day If we do nothing, another failure will eventually occur We Need Redundancy!

9 Recommended Alternative
Two Tunnels Tunnels begin at Mass Pike/Route 128 Northern Tunnel miles, connects to mid-point of WASM 3 in Waltham/Belmont area Southern Tunnel miles, connects to Shaft 7C and southern surface mains 10’ finished diameter pressure tunnel 200’ – 500’ deep (rock) Mined using TBMs Number and locations of shafts TBD No consent decree (this is a water distribution redundancy program) WASM 3 Proposed 10-ft Northern Tunnel Proposed 10-ft Southern Tunnel Southern Spine Surface Mains

10 Hydraulic Objectives for Proposed Tunnel
Provides redundancy for entire metropolitan tunnel system Provides normal water service and fire protection if existing tunnel system is out of service Designed to meet high day demand. No seasonal restrictions Provides ability to perform maintenance on existing tunnels year-round Avoids activation of emergency reservoirs No boil order! Proposed 10-ft Northern Tunnel WASM 3 Southern Spine Surface Mains Proposed 10-ft Southern Tunnel

11 Project Costs Midpoint of construction – Northern Tunnel: $472 million Midpoint of construction – Southern Tunnel: $1,003 million Midpoint of construction – both tunnels is $1,475 million Estimated time to completion of 17 – 23 years 30% contingency and 4% annual construction cost escalation

12 Metropolitan Tunnel Redundancy Program Outlook
The Program is managed by the MWRA Tunnel Redundancy Department (similar to PMD for BHP) The Program is funded in our Capital Improvement Plan DRAFT FY20 CIP Budget includes…. Program-Wide Support Services Preliminary Design/Phase 1 Geotech/MEPA Review Final Design(s) Construction Management(s) Tunnel Constructions Surface Connections Constructions Administration, Legal and Public Outreach

13 Program Organization

14 Preliminary Design Engineering
Preliminary geotechnical investigation, route and shaft site evaluations, identify environmental permits needed and prepare required MEPA review Produce significant project documents Preliminary Geotechnical Data & Design Report Environmental Impact Reports Alternatives Evaluation & Preliminary Design Report Preliminary Design Drawings It is expected this work can be accomplished within 3 – 3.5 years

15  Planned Schedule Program Support Services Awarded in March 2019
Preliminary Design/Phase 1 Geotech/MEPA Review Issue RFQ: Summer/Fall 2019 Notice to Proceed: first half of 2020 Estimate Completed: late 2023 Final Design Start 2024-ish Construction Start 2027-ish (D-B-B)

16 The Metropolitan Tunnel Redundancy Program
Thank You!

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