This project included the design of drainage improvements and the development of grading plans and construction documents associated with the elimination of select wetlands on Chicago-owned property at O’Hare International Airport. As part of the planning process for the O’Hare Modernization Program (OMP), 154.2 acres of wetlands/Waters of the United States (WUS) were identified as areas that would be directly impacted by construction activities associated with airport modernization. Bensenville Ditch includes approximately 12 acres of jurisdictional wetlands and WUS. To comply with local, state and federal regulations governing wetlands, the City received a comprehensive United States Army Corps of Engineers (USACE) 404 permit allowing any/all identified wetlands/WUS to be impacted and/or eliminated. The construction drawings included site clearing, grubbing and demolition; final grading contours and earthwork analysis, including excavation, fill, removal of unsuitable soils along with analysis of topsoil volumes, and shrinkage and/or swell. In addition, the design included horizontal and vertical alignment of the relocated creek, the structural design of box culverts, walls and retaining structures; topsoil, seed/sod; and other erosion controls as required.
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