OMAHA, NE Gonzalez was hired to prepare preliminary and final design for separation of an existing combined sewer into separate sanitary and storm sewer systems in the City of Omaha. The project is located in the area surrounding the 42nd Street and Q Street intersection, and is part of the City of Omaha’s Long Term Control Plan (LTCP). The sewer separation project eliminated CSOs 207 and 208, two outfalls into Blood Creek.
The preliminary design was on a short schedule, to accommodate the 42nd & Q St. bridge project design underway in the center of the CSO area. The Gonzalez/CSO project recommendations were incorporated into the bridge project design. Gonzalez was then retained by the City of Omaha for completion of final design in the remaining CSO area.
The Gonzalez team evaluated the existing system conditions and developed four separation alternatives for a Basis of Design Report. The chosen alternative for construction includes: 7,270 linear feet of new storm sewer; 840 linear feet of new sanitary sewer; a bioretention system in Hitchcock Park; a storm sewer tunneling installation beneath a railroad; a sanitary sewer tunneling installation beneath Q Street; and existing street and sidewalk removal and replacement.
Geotechnical services provided include:
Geotechnical desktop survey of existing soils information to evaluate conceptual design of project components
Preparation of geotechnical desktop survey report
Geotechnical subsurface investigation and laboratory testing
Preparation of Geotechnical Report
Preparation of Specifications for tunneling construction
