This was a 4-phase sewer replacement project across a suburban office park situated on a 62.5 acre, 23 building campus in St. Louis. It included installing 120,000 square feet of StormTrap underground water retentions cells for rainwater runoff storage during heavy rain events under a parking lot. This same parking lot was outfitted with solar powered street lights in line with the “green building” directive. A second smaller 1,200 square foot retention StormTrap cell structure was also installed during the project. Tens of thousands of sewer pipe was installed to split the sanitary lines from the storm lines across the campus. Asphalt roads and sidewalks were reinstalled as well as landscaping after the pipes were installed.