The city constructed the Alder Pump Station at SE Water Avenue and SE Alder Street in 1952. This upgrade project will improve reliability, increase pumping capacity and help prevent sewage releases to protect public health, water quality and the environment.
Construction is anticipated to begin early summer 2017 and take two years to complete.
The Alder Pump Station pumps sewage and stormwater from central eastside Portland to the Columbia Boulevard Wastewater Treatment Plant in north Portland.
The pump station service area contains 88 acres of industrial and commercial properties and city right-of-way. The combined sewer system in this area conveys both sanitary sewage and stormwater runoff in the same pipes. During very heavy rain storms, stormwater runoff can fill the system to capacity and cause a combined sewer overflow to the Willamette River. Heavy rain and an overloaded sewer system have caused 11 sewage releases in the Alder Pump Station service area since 2005.
Pump Station Improvements
Environmental Services will demolish the existing above-ground pump station and construct a temporary pumping system that will be removed once the new system is operational:
- Demolish the existing station and above-ground reinforced concrete circular building
- Retain the below-ground portion of the building as a structural shoring system for construction of a new wet well
- Replace existing pumps and equipment with two submersible pumping systems in a common wet well and make the new structure more earthquake resistant
- Replace outdated mechanical, electrical and control equipment and systems
- Upgrade heating, ventilation and air conditioning systems
- Provide a drive-through with access from both SE Water Avenue and SE Alder Street
- Install security fencing with gates at each end of the access drive-through
- Install screen walls, retaining walls and a loading dock area
- Construct an ecoroof and stormwater facility incorporated into a ramp structure
- Install a new, standby diesel-engine generator
- Upgrade the pump station’s exterior appearance