Our solution provided the client more than $50M in savings with an innovative design
With an approaching EPA consent decree, the Northeast Ohio Regional Sewer District (NEORSD) began a $3B Combined Sewer Overflow (CSO) Plan Improvements Program to better control sewer overflows in its easterly sector. The Easterly Tunnel Dewatering Pump Station project is one of the largest CSO pump station projects in the US and a critical component of the overall program.
The pump station is housed 240 feet below ground in a cavern, and will pump 160 MGD to entirely dewater the storage tunnels and convey flow to the Easterly Interceptor for transport to the Easterly Wastewater Treatment Plant within a 24-hour timeframe. The main shaft is 45 feet in diameter and contains an elevator, main stairwell, and equipment removal shaft. An auxiliary shaft, 40 feet in diameter, houses the auxiliary stairwell pump discharge piping and HVAC ductwork. Two service shafts are approximately 40 feet in diameter and contain an elevator, main stairwell, and equipment removal apparatus.
The pump station, equipped with nine pumps, enables the Euclid Creek and Dugway storage tunnels to capture flows in a controlled fashion that would have otherwise been discharged into surface waters, causing urban flooding and discharges of sanitary sewage to the surrounding environment. We anticipate the pumps will be activated about 80 times per year and completely fill about four times per year. We also anticipate the pumps will operate on average 340 hours per year, greatly reducing the discharge into surface waters due to overflow.
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