RJN Group’s West Park Wet-Weather Storage Facility project was selected by the APWA (American Public Works Association) as a Public Works Project of the Year in the Structures category, $5 Million to $25 Million. Congratulations to all involved in making this such a fine success!
The Village of Wilmette experienced numerous reoccurring basement backups during major rain events over the last decade. To solve this problem, the West Park Wet-Weather Storage Facility, a 5.5 million gallon, concrete, underground storage tank located below a multi-use public recreation facility on the west side of the Village of Wilmette, Illinois, was designed and constructed. The tank access structure is the only component of the tank that is not underground:
The tank provides needed collection system capacity during wet-weather events. Designed and constructed under a joint-venture design-build partnership between RJN Group, Inc., and Boller Construction Company, the West Park Wet-Weather Storage Facility project was impressively completed in a little more than a year. This complex project was completed using an alternate design-build delivery method, requiring extensive communication, public outreach, and coordination with multiple stakeholders and regulators.
Additional Information about the Project
In addition to the 5.5 million gallon underground concrete storage tank, the facility also includes a three-pump lift station that pumps flow back into the system, recirculates flow in the tank, and flushes and cleans the tank as well as an odor control system.
The West Park lift station has a unique, innovative design that enables efficient, multifunction capabilities. With three pumps, each dedicated to a specific purpose, the lift station design provided significant cost savings to the Village of Wilmette. Here is a look at the construction of this lift station:
The way the single set of pumps performs all three O&M processes not only saves money but also facilitates ease and efficiencies during ongoing maintenance. In addition, it is environmentally friendly in that it minimizes potable water usage.
Project Statistics—At a Glance
- 5.5 million gallon concrete storage tank—310 feet long by 168 feet wide by 22 feet high
- 20,000 tons of concrete (1,200 truckloads)
- 1,200 tons of steel
- 98 columns (at right) in three components – 26 inches in diameter – poured on site to support the tank ceiling
- 90,000 cubic yards of dirt excavated