Client: Altoona Water Authority, Blair County, PA
Project Cost: $10,000,000
To address sewer overflows and surcharging in the Westerly Altoona conveyance system, Gwin, Dobson & Foreman designed a comprehensive capacity system solution for the Altoona Water Authority. The project involved the replacement of a gravity interceptor sewer and installation of a wet weather wastewater lift station and force main.
After an extensive sewer monitoring and modeling effort, GD&F designed a system that maximized use of the existing system while providing additional capacity through larger diameter sewers and a wet-weather lift station as follows:
- Installation of 5,500 LF of 30 and 36-inch diameter polypropylene interceptor sewer pipe extending from Morningside and Milton Avenues to Cayuga Avenue and Pleasant Valley Boulevard.
- Installation of 4,000 LF of 16-inch diameter of AWWA C-905 PVC pipe on Pleasant Valley Boulevard from Cayuga Avenue to the lift station at 22nd Street and Valley View Boulevard.
- Horizontal borings for 24 to 54-inch diameter steel casing pipe (325 LF) for major stream and highway crossings.
- New wet-weather wastewater lift station with a capacity of 10 MGD employing four (4) self-priming, Gorman-Rupp pumps. A diversion structure directs flow to the lift station when the capacity of the existing 21-inch sewer is exceeded.
- Cleaning and removal of 4,000 CY of material from the Tuckahoe Park and Bellwood Avenue combined sewer overflow storage facilities. CSO work included refurbishing the coarse screens, control valves and various HVAC/electrical components.
- Slip-lining of a portion of the Westerly Outfall Sewer consisting of 6,000 LF of 27-inch diameter terra-cotta pipe. This $1 million project was partially funded through $0.5 million in project savings.
- A $1.7 million capacity-related project with 4,620 LF of 12 to 30-inch sewer pipe replacement on the South Altoona outfall and 58th Street interceptor sewers.
The project was funded by a $6.1 million, low interest (1%, 20 years) Pennvest loan, a $2 million Pennworks grant from the Commonwealth Financing Agency and $1.9 million in Authority funds.