Underground Utility Contractor Midwest REM, based in Melrose Park, Illinois, recently completed casting- in-place a new storm-water pump station at O’Hare International Airport. The new pump station is a sub- project of the multi-year, multi-million dollar O’Hare Modernization Program. The 7,500 gallons per minute structure measured 60 feet wide, 60 feet long, and 35 feet tall. Adding to the excavation project’s already challenging parameters was the fact that the behemoth pump station needed to be tucked-in between an adjacent road and a near- are no overhead obstacles like powerlines, the flying planes are the overhead obstacles,” Murphy said. With an excavation the size needed to form and pour the jumbo concrete structure, shoring options are limited. Tight sheeting is usually the first shoring system considered for such a large excavation, but because of the strict project parameters, sheeting was not going to work. “The height restriction meant we couldn’t drive sheeting to shore the excavation, or we would need to drive the sheets at night,” said Murphy. “But if we tried to open cut and slope, we’d have a hole as big as China.” Midwest REM needed a safe and cost-effective shoring alternative to tight sheeting or open-cut. by active runaway. Surprisingly, however, the limited space around the excavation site was not the biggest challenge facing the contractor. “The biggest challenge on this project was head- space,” said Walter Murphy, Midwest REM’s project superintendent. “Working at one of the busiest airports in the world, the Federal Aviation Admin- istration will only allow you to go so high with your equipment,” explained Murphy. “Even though there With tight sheeting ruled out, Murphy called local shoring equipment distrib- utor Trench Plate Rental to enquire about using an Efficiency Produc- tion manufactured Slide Rail Shoring System. “We chose Slide Rail because it was the only shoring system that would work with the limited space between runaways and roads and flying planes,” said Murphy. Midwest rented enough Slide Rail equipment to install a 63 x 63 x 32 foot shoring system. Slide Rail is installed simultaneously as the trench or pit is excavated by sliding the panels into integrated rails on the posts then pushing the panels and posts incre- mentally down to grade as the pit is dug; a process commonly referred to as a “dig and push” system.