The Crossfield Taxiway Project is part of LAX’s modernization plan. The project widens and strengthens two existing crossfield taxiways immediately west of the Bradley Terminal. In addition, the project will add or relocate facilities including taxiways and parking areas, add a new service road and utility corridor, and construct a new Aircraft Rescue and Fire Fighting Facility.
The improvements call for a new stormwater treatment system. An underground solution was needed, as a retention pond was not appropriate due to structural issues and concerns with natural based solutions encouraging bird activity. Complicating the matter, the site had problematic hydraulic and HGL issues.
The new system needed to treat a large volume of runoff and handle loading of an Airbus 380, the world’s largest passenger airplane (1,200,000 lbs.), and provide filtration to remove pollutants. In addition, a system that installed rapidly was needed due to the aggressive 14-month schedule for the entire project. The solution they chose was The Stormwater Management StormFilter® housed in a CON/SPAN structure.
CON/SPAN is a modular three-sided concrete structure installed on a cast in place continuous foundation which ensured structural integrity and eliminates differential settlement. The distinctive shape of CON/SPAN consists of an arch top and vertical side walls. CON/SPAN units can be designed for any loading condition, including HS 20-44, HS 25-44, AREMA (railroad), and aircraft loading.
Two separate systems were installed. The first system treats 15 CFS of runoff in three rows of CON/SPAN units 24’ wide x 7’ rise x 56’ 3” long. The second system treats 22 CFS in three rows of CON/SPAN units 24’ wide x 7’ rise’ x 48’ long.
Both systems feature The Stormwater Management StormFilter, which removes the most challenging target pollutants — including soluble, heavy metals, oil, fine solids and total nutrients — using a variety of sustainable media.
Contech’s StormFilter has a proven, two-decade history, and the two-year maintenance cycles mean fewer maintenance events throughout the lifetime of the system. The one-of-akind, self-cleaning hood prolongs cartridge life and promotes long-term performance.
The project was installed over the several months. The slab was poured for the foundation of the CON/SPAN arches, which installed very quckly and easily. Next, the flow kits were installed and then the StormFilter cartridges. Contech’s local Stormwater Design Engineer was able to meet directly with the design engineers to work out design issues face-to-face and was onsite during the installation.
Qantas Airbus A380 weighing more than a million pounds was the first plane to land on the new 3,437-foot Crossfield Taxiway. The upgrading of LAX gives the airport the ability to handle super-jumbo jets such as the Airbus A380 and the Boeing 787 Dreamliner. The project also improved the safety and efficiency of aircraft movements on the ground, reducing aircraft emissions, and alleviating congestion at the existing taxiway.
The CON/SPAN Stormfilter System was determined to be the optimal solution to meet the challenging structural, technical and regulatory requirements of LAX, one of the nation’s busiest airports. Contech’s proven performance is providing a cleaner environment and protecting the local watershed that ultimately drains to the ocean.