This new 12,000 SF deicing collection and water treatment facility processes storm water run-off from ramps and runways which, in the winter, is contaminated with deicing chemicals. The enhanced system expands the existing system’s ability to capture a greater amount of storm water run-off which effectively doubled the capacity.
The environmentally-friendly system is one of three in the United States and reduces the level of effluent discharge so there are no significant impacts to endangered salmon in the Columbia or Willamette river systems. The project includes five pump stations (three new and two renovated and upgraded), 3,700 LF HDPVC (3/4 of a mile) installed by boring 70’ below the surface under aircraft aprons, taxi ways, and very busy streets. The pipe was pre- assembled with fusion welding before it was pulled through the hole.
The processing of deicing fluid is through an anaerobic digestive closed system. Two dilute storage tanks (runway run-off and drainage basin) adjacent to the treatment building hold 6.5 million gallons each. The processing system is designed to treat the concentrated and dilute storm water before discharging under the Marine Drive dike into the Columbia River outfall structure.