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Modjeski and Masters is pleased to announce the acquisition of structural engineering firm Summit Engineering Group, Inc. Our combined engineering prowess and respective technical skillsets will enable us to provide streamlined design and construction solutions to best meet client needs.

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I-395 Tunnel at Mt. Vernon Place Vulnerability Study

| View Projects: Washington, DC

  • Client:

    District Department of Transportation
  • Service:

    Highways & Other
  • Status:

    Completed
  • Overview

    The threat of terrorism against American citizens and assets is very real. September 11th, 2001 changed the way Americans think and live. Because the goal of a terrorist attack is to inflict substantial human casualties and negatively impact the region’s economy, transportation and related assets make an attractive target. Their accessibility and potential impact on human lives and economic activity is not lost on terrorist groups. As a result of the 9/11 attack, the PATH commuter rail line and station, which carried 67,000 passengers each weekday to Lower Manhattan, was closed for about two years. With a proposal to construct an eight story office building above the I-395 tunnel in Washington, DC, the District Department of Transportation (DDOT) and the Federal Highway Administration required the completion of a security assessment of the existing facility before and after the building’s construction.
     
    Our recent participation on the FHWA/AASHTO Blue Ribbon Panel on Bridge and Tunnel Security helped convince DDOT and the FHWA that the best bridge engineering firm for the job: was Modjeski and Masters. We completed a rigorous study, utilizing our transportation experience and the AASHTO Guide to Highway Vulnerability Assessment for Critical Asset Identification and Protection.  Our team used methodology outlined in the guide to evaluate potential vulnerabilities for pre- and post-construction conditions.  We compared before and after “scores” to determine whether the proposed structure had a net positive or negative impact on the tunnel’s security. To assess security during the construction phase of the project, Modjeski and Masters utilized a NIST document entitled Best Practices for Project Security. Our study concluded the proposed structure would not negatively impact the security of the I-395 tunnel.  Characteristic of our desire to exceed client expectations, we went one step further and provided our client with a list of recommendations to improve the security of the I-395 tunnel facility.
     
    Modjeski and Masters continues to provide engineering services to DDOT through a variety of current or recently-completed projects, including:
    • The Citywide Bridge Inspection Program,
    • The rehabilitation of the 14th Street Bridge, and 
    • The redesign of the 16th Street Bridge over Military Road.
  • Description

    Tasks Performed
    • Bridge Security
    Tunnel Geometry
    • Length of Tunnel - 390 feet
    • Lanes in Tunnel - two lanes in each direction
  • Testimonial

    We completed a rigorous study, utilizing our transportation experience and the AASHTO Guide to Highway Vulnerability Assessment for Critical Asset Identification and Protection.
  • Credits

    Dr. John M. Kulicki, PE, SE (Principal In Charge)
    Chad M. Clancy, PE (Project Manager)