Improvements Project Hopkinton-Westborough- Southborough December, - - PowerPoint PPT Presentation

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I-90 / I-495 Interchange Improvements Project Hopkinton-Westborough- Southborough December, 2014 Introduction / Welcome Paul Matthews, Executive Director, 495 MetroWest Partnership Renata Welch, MassDOT Project Manager Jonathan

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I-90 / I-495 Interchange Improvements Project Hopkinton-Westborough- Southborough

December, 2014

SLIDE 2

Paul Matthews, Executive Director, 495 MetroWest

Partnership

Renata Welch, MassDOT Project Manager
Jonathan Gulliver, MassDOT District Highway Director

Introduction / Welcome

SLIDE 3

Historic congestion at interchange associated with toll

plaza

MassDOT planning study (2012-2013) identified

deficiencies and need for improvements

Implementation of All Electronic Toll System (AETS)

July 15, 2016

Subsequent elimination of toll plaza will not eliminate

congestion and safety issues Background

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Project Area

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Immediate Study Area

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Based upon 2035 Priority

Development Areas scenario

Weekday AM and PM peak

hours

2035 Design Volumes

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Previous Concept from Planning Study

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Safety and Operational Issues

Substandard geometry
Magnitude of passenger vehicle traffic
Magnitude of truck traffic
Vehicle conflicts (weaving sections) within interchange

area Background

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Advocacy

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Advocacy

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Advocacy

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Advocacy

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What Are We Trying to Do

Eliminate Weaving Movement Conflicts
Improve Interstate-to-Interstate Design
Reduce Congestion and Travel Time
Minimize Resource Impacts

Project Goals

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Existing Conditions

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Environmental Concerns

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Environmental Concerns

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Environmental Concerns

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Environmental Concerns

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Environmental Concerns

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MassDOT internal working group started with a blank

slate to envision new interchange configurations

New interchange configurations were then modified

while still maintaining appropriate design speeds and geometry

All design standards are met
New ramp designs to provide direct connections and

eliminate weaves

Concept Development

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DIRECTIONAL (60MPH)

Concept Development

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FULL CLOVERLEAF

Concept Development

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Design/Operations

Eliminate weaves
Direct connections
Ramp geometry
Reduce congestion
Stormwater BMPs

Cost/Construction

Construction cost
Mitigation cost
Bridge maintenance
Phasing
Maintaining traffic

Environmental

Wetlands
Flood zone
Habitat
ACEC
Open space
Riverfront area
Historic /

Archaeological

Hazardous materials
Air quality
Water quality

Socioeconomic

Noise / distance

from residences

Neighborhood

impacts

Visual impacts
Environmental justice
ROW impacts

Regulatory

Meets Purpose &

Need

Permit requirements
Mitigation needs

Screening Categories and Considerations

SLIDE 24

Initial Screening

Concept Development

Concept 22-3
Concept 14-5
Concept 14-4

Eight Initial Concepts 30+ Variations of Initial Concepts

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Concept 22-3

Existing Ramp to Remain (with Modifications)

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Concept 22-3

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Concept 14-5

Existing Ramps to Remain (with Modifications) Existing Ramp to Remain (with Modifications)

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Concept 14-5

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Concept 14-4

Existing Ramps to Remain (with Modifications) Existing Ramp to Remain (with Modifications) Existing Ramps to Remain (with Modifications)

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Concept 14-4

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Based upon 2035 Priority

Development Areas scenario

Baseline (No Build)

represents conditions with toll plazas removed

Weekday AM and PM peak

hours analyzed

All three concepts provide

acceptable operations and address weaving and congestion concerns

Preliminary Traffic Modeling

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Insert video clip 2035 No Build PM

Future PM Peak Hour Conditions (2035) –No Build

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Future PM Peak Hour Conditions (2035) – Concept 14-4

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2035 Operational Benefits

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Resource Impacts

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Concept 22-3 $285,400,000*
Concept 14-5 $215,800,000*
Concept 14-4 $162,000,000*

note: does not include engineering, mitigation or ROW costs

* 2014 Dollars

Conceptual Cost Estimates

SLIDE 37

Project has historically been included in Central Mass

MPO / CMRPC Long Range Transportation Plan (LRTP) but not fully funded

Project has been included by reference in Boston MPO

LRTP

Need to continue efforts to include in both plans and

eventual Transportation Improvement Program (TIP)

Funding expected to include Western Turnpike funds

Programming

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November 18th – initial discussion with FHWA

environmental and programming staff

December 2nd – initial discussion with State and

Federal environmental agencies

December 18th – initial discussion with 495 MetroWest

Partnership, local and regional officials and stakeholders

Outreach

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Overall Project Schedule

1 2 3 4 5 6

Planning Study Feasibility Study/ Conceptual Design EA / EIR / 25% Design Final Design and Permitting Early Action Construction Construction Complete

Current Stage

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Next Steps

Continue to refine concepts and impact calculations
Prepare ENF for Winter 2015 filing
Work with MPOs (Boston, Central Mass) to include

project in Long Range Plans

Procure consultant services for environmental

documentation / 25% / permitting

Prepare Environmental Assessment / Environmental

Impact Report for NEPA and MEPA and obtain permits

Design and Construction

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