Excavation at Denver’s Union Station will resume Monday after the state granted a new permit for pumping out groundwater on the construction site. From early spring through May, Roger Sherman, spokesman for the Union Station redevelopment project, estimates crews had pumped out and filtered 170 million gallons of water that were then dumped into the South Platte River.
At the start of June, officials decided it would be more efficient to add new filtration units and use a new chemical process to properly filter the water that has a high iron content, instead of wearing down the two units that were working at a slower rate.
Sherman said there is virtually no cost difference for the different filtration process because of the difference in efficiency.
While waiting for the new permit, groundwater was accumulating at an estimated 0.1 inch every two hours.
The permit for using the additional equipment was granted Thursday, and crews worked all day Friday to pump out the remaining water so construction could resume Monday. Yesenia Robles, The Denver Post
