Project At-a-Glance
- Consent Decree driven wet weather project with 5.8 million gallons of CSO storage capacity
- High chloride content of ground water resulted in the design of “bathtub” consisting of diaphragm wall around the perimeter with a jet-grout base
- Construction methods included: slurry wall and jet grout, microtunneling and conventional cut-and-cover
- Geotechnical instrumentation included piezometers, inclinometers and seismographs
- Urban center project location bounded by Onondaga Creek
- Visit Onondaga County’s Save The Rain website for more details about the Clinton CSO Storage Facility
Project Narrative
This project, undertaken by the Onondaga County Department of Water Environment Protection (County/Owner), was one of many to comply with a Consent Decree with USEPA and New York State Department of Environmental Conservation to mitigate untreated wet weather related discharges to Onondaga Creek and Onondaga Lake.
Subsurface conditions at the site consist of glaciofluvial gravel laden strata and glaciolacustrine clay. The project includes new gravity conveyance sewer pipes which range in diameter from 36 inches to 96 inches that connect existing combined sewer lines to the new Storage Facility. Additionally, a 16-inch diameter force main was constructed to convey stored effluent to the main interceptor sewer.
The combined storage capacity for the facility is approximately 5.8 million gallons. Storage Tunnels consist of three parallel 15-ft wide by 19-ft high box tunnels each being approximately 850-ft in length. The three storage tunnels were constructed within a groundwater management system consisting of the slurry wall (diaphragm wall construction) along the perimeter and a jet grouted base that formed a bathtub.
Brierley Associates was retained by the joint venture project designers, EEA, to provide a full array of underground engineering and field services during geotechnical construction.
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