Under an open-end agreement with Pennsylvania Department of Transportation District 3-0, RETTEW prepared preliminary engineering, final design, and a final cost estimate within 1 percent of the bid for the rehabilitation and replacement of multiple structures along I-80 as part of a larger roadway reconstruction and restoration effort. Our engineering services for this close to 7-mile-long, limited-access highway rehabilitation project involved concrete pavement repairs, portions of roadway reconstruction, guide rail upgrades, and drainage repairs.

Specifically, RETTEW was responsible for two bridge replacements over SR 3003, rehabilitation of two bridges over Mexico Road, and raising the SR 3006 superstructure 5 inches over I-80. The project also involved a superstructure replacement on the eastbound lanes of SR 3007 and rehabilitation of the structure on the westbound lanes over SR 3007. On the environmental side, RETTEW completed aquatic resource identification and reporting for each roadway section, including delineating more than 30 streams and 40 wetlands. We also completed stream design to temporarily relocate a stream during construction and stream restoration design to be completed post-construction.

RETTEW also prepared traffic control plans that required us to maintain four lanes of traffic at all times during the reconstruction phases. Altogether the project encompassed roadway reconstruction, resurfacing, structure replacement, rehabilitation, preservation, lighting, and other miscellaneous construction along these sections of I-80.