By Lynda Myer
In order to advance RiverRenew project, AlexRenew, the wastewater treatment provider for Alexandria, Virginia, has taken delivery of a Herrenknecht TBM.
Capturing, storing, and transporting combined sewage to AlexRenew, where it will be purified and returned to the Potomac River, the 3.2km (2 miles) Waterfront Tunnel is going to be excavated using this 4.47m diameter TBM.
Aa the largest infrastructure project in Alexandria’s history, RiverRenew following completion will prevent over 120 million gallons of combined sewage from polluting the Potomac River, Hunting Creek, and Hooffs Run each year, while the determined date for completion of this project is July 2025.
Diversion facilities to direct 130 million gallons of combined sewage into the tunnel system; the 800m-long (half a mile), 1.8m-wide (6ft) Hooffs Run interceptor, pumping stations housed in two large shafts, and a superstructure to house pumping station equipment, will be the other contents of this project along with the construction of the tunnel at a depth of 30m.
The TBM has been named Hazel after Hazel Johnson, one of America’s leading pioneers for environmental justice.
