Ever wondered what a gravity thickener looks like at a wastewater treatment plant? This sequence of photos is from early July 2014 through mid-November 2014 as the four gravity thickener tanks  and the elevated slabs for the new pump station (to the left of the tanks in the last photo) at the Rock Creek Advanced Wastewater Treatment Facility are constructed. Over 3,000 cubic yards of concrete were poured to construct these tanks.