I-270 North Project Facilitates Partnerships to Address Environmental Risks

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CONTENT EXPIRES: December 31, 2024

The I-270 North Design-Build Project is Missouri Department of Transportation’s (MODOT) largest project in the past decade. The project is reconstructing eight miles of Interstate 270 in St. Louis County. Within the project limits, soil contaminated with radioactive waste generated from the Manhattan Project presented a major environmental risk to the project scope and schedule. The I-270 North Design-Build Team partnered with US Army Corps of Engineers FUSRAP division (Formerly Utilized Sites Remedial Action Program), early in the development of the bridging documents to identify the soil contamination and establish parameters for construction activities within the contaminated areas. During procurement MoDOT developed a flexible RFP to allow proposing teams multiple pathways for its interactions with FUSRAP. Facilitated meetings between Design-Build Teams and FUSRAP built a partnering relationship between all entities, allowing teams to confidentially propose construction methods and schedules and ultimately reduce risk to the Design-Build Team’s project schedule and scope. The close collaboration between entities continues through construction and has resulted in thousands of cubic yards of contaminated soil being remediated, benefitting all partners and the community, without impacting the I-270 North Project schedule. 

Four Objectives  

1. Analyze opportunities with Public Entities to reduce risk for Design-Build Teams.  

2. Define best practices for introducing Design-Build Teams to potential environmental risks before and during procurement.  

3. Develop flexible contracting language to increase contractor engagement in project scope.  

4. Facilitate collaborative relationships between owners, teams, and external partners for project success

Tabitha Locke, P.E.

Assistant to the Resident Engineer

Missouri Department of Transportation

Tabitha Locke, P.E., graduated from Missouri University of Science and Technology with a B.S. in Civil Engineering. After graduation she began her career with MODOT as a Construction Inspector in the St. Louis metro area. In 2018, she began working on the I-270 North Design-Build Project during the contract writing and procurement phase. She is now the Assistant to the Resident Engineer in the Chesterfield Project Office in MODOT's St Louis District

Michael Crutcher, P.G., P.E.

Principal Environmental Engineer

HydroGeologic, Inc

Michael Crutcher, Principal Environmental Engineer for HydroGeologic, Inc., has over 30 years of experience as an environmental consultant. He currently prepares remedial designs for low level radiologically contamination for the USACE FUSRAP in St. Louis County, Missouri. A 1984 graduate of University of Missouri – Rolla (B.S. Geological Engineering) and a 1990 graduate of Vanderbilt University (M.S. Environmental Engineering), he is a Professional Geologist and Professional Engineer licensed in both Missouri and Illinois.

Brett Lennon, P.M.

Project Manager


Brett Lennon graduated with a Bachelor of Science in Construction Science and Management from Kansas State University in 2008. After graduation he went to work for Fred Weber, Inc., where he had previously completed a summer internship. He has remained with the company, now Millstone Weber, following a merger with Millstone Bangert in 2014. He is currently the Construction Manager for Millstone Weber managing their $251 Million MODOT I-270 North Design-Build project.


I-270 North Project Facilitates Partnerships to Address Environmental Risks
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Certificate of Completion
1.00 CEU credit  |  Certificate available
1.00 CEU credit  |  Certificate available