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Easterly Tunnel Dewatering Pump Station (TDPS)

Owner/Client:  
Northeast Ohio Regional Sewer District

Location:  
Cleveland, Ohio 

Services Provided: 
Geotechnical Reporting, Geotechnical Drilling, and Laboratory Testing Services
 
Construction Cost: 
$100 million

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9/23/2010 9:21:00 AM
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2/6/2012 4:20:00 PM

The proposed TDPS will pump captured flows from sewer tunnels to the Easterly Main Interceptor for conveyance to the Easterly Wastewater Treatment Plant for treatment after storm events. The TDPS will be a cavern-type deep dewatering pump station that will be able to pump a peak capacity of 160 million gallons per day (MGD). The cavern will be constructed between two deep shafts and will house the pumping equipment including valves, pumps and motors. The cavern will also be constructed in shale bedrock at a depth of approximately 220 feet below ground level. The pump station will include an above-ground pump house facility. The TDPS will also include discharge pipes that connect the pumped flows to the Easterly Main Interceptor via a connection structure conveying flows to the plant.

In collaboration with MWH, Rii provided geotechnical services and prepared preliminary and final geotechnical data reports. Work included determining the parameters of a soil boring program for the project areas, performing the subsurface investigation drilling and sampling, installing monitoring wells, conducting laboratory testing and preparing reporting. The final boring logs included the data gathered in both the field and lab. The logs were incorporated into the final geotechnical data report (GDR), which will be issued with the construction bid documents along with an accompanying geotechnical baseline report (GBR). The boring program consisted of 13 borings at 782 feet of soil drilling and 883 feet of rock coring; piezometer installation and packer testing. The laboratory testing included performing atterberg limits, splitting tensile strength, slake durability, one-dimensional consolidation testing, ultrasonic elastic contents, elastic moduli and direct shear testing. The estimated completion date is 2014.