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Cole Creek CSO 204 Sewer Separation Phase 2 preliminary and final design began in September 2015. Design continued into 2017 when escalating construction cost estimates and additional construction risks raised concerns about the current design concept. The project was placed on indefinite hold while other options are evaluated. The City/Program Management Team began design of Cole Creek CSO 204 Phase 3 to continue progress in this basin while the Phase 2 concept is re-evaluated.
The specific project area for Cole Creek CSO 204 Phase 2 is bounded roughly by Spaulding Street on the north, 60th Street on the east, Maple Street on the south, and 63rd Street on the west.
The Phase 2 project includes a new sanitary sewer along 63rd Street from Spaulding Street to Bedford Avenue and on 61st Street from Bedford Avenue to 40 feet south of NW Radial Hwy which will enable separation of the main combined sewer in the area. This sewer will connect to the new sanitary sewer built under Phase 1 construction (2015-2016).
Evans Street, Pinkney Street, Emmet Street, Spencer Street, and Bedford Avenue between 61st Street and 63rd Street will also have new sanitary sewer installed to tie into the new line along 63rd Street.
The Cole Creek 204 Sewer Separation project is a multi-phase project located in a 522 acre basin referred to as Cole Creek CSO 204. It is bordered on the north by Brown Street, on the east by 52nd Street, on the south by Northwest Radial Highway, and on the west by Cole Creek.
The Phase 2 preliminary design includes a new sanitary sewer along 63rd Street from Spaulding to Bedford Streets. This sewer will connect to the sanitary sewer built under Phase 1 construction (2015-2016). Evans Street, Pinkney Street, Emmet Street, and Bedford Street between 61st Street and 63rd Street will also have some new sanitary sewer installed that connects to the 63rd Street sanitary system.
Specifically, Phase 2 currently includes approximately 5,200 linear feet of 8-inch diameter sanitary sewer and 2,100 linear feet of 10-inch diameter sanitary sewer to increase capacity and separate the combined sewers on 63rd Street and east branching side streets. Storm sewer construction will primarily consist of re-routing inlets and addressing some street flooding issues by constructing approximately 2,300 linear feet of 15 to 21-inch storm sewer.
This project is Phase 2 of approximately six planned phases that will convert the existing combined sewers to either storm or sanitary sewer plus providing additional capacity with new sewers. It will ultimately result in reduced sewer backups into area homes and reductions in combined sewer overflow volume and flowrate to Cole Creek.
The current design for Phase 2 construction includes:
Project Number: OPW 52814
LTCP Project Name: Cole Creek CSO 204 Sewer Separation Phase 2