As a subconsultant to CKL Engineers, Ltd., INTERRA provides Materials Coordination, Quality Assurance Materials Testing, and Construction Inspection services as requested for the contract and its associated tasks.

RR-20-4532: Deerpath Road and Bridge Reconstruction – This project removed/replaced the Deerpath Road Bridge over the Reagan Memorial Tollway (I‐88) to extend the life of the local crossroad bridge carrying traffic over the Tollway. The new bridge provides two 13‐foot lanes of traffic and 5‐foot shoulders on Deerpath Road. In addition, the existing four‐span structure was replaced with a two‐span bridge.

RR-20-4544: I-88 M-8 WB Access (MP 117.4 to MP 117.5) – This project included the construction of a Tollway maintenance vehicle access ramp, installation of new retaining wall, lighting, and drainage improvements, earthwork, and landscaping/erosion control.

RR-21-4580: I-88 M-8 EB Access (MP 117.7 to MP 117.9) – This project included the reconstruction of the Toll Plaza 61 parking lot, lighting and drainage improvements, earthwork, and associated landscaping/erosion control.

RR-21-4591: Systemwide Sign Structure & Improvements (I-88, I-355 & I-90) – This project included the removal and relocation of existing signing, installation of proposed overhead signing and ground mounted signs, erosion control measures and landscape restoration, dynamic message sign (DMS) improvements, and the maintenance of traffic.