Hazel will dig a 12-foot-wide, 2-mile-long tunnel to divert approximately 120 million gallons of sewage annually away from Alexandria’s waterways.
In the summer of 2022, Treatment Plant Operator first reported on a new 380-ton, 14-foot 8-inch tall tunnel boring machine (TBM) named Hazel that had been unveiled by AlexRenew — Alexandria, Virginia’s wastewater authority — marking a significant milestone in its RiverRenew...
