Located at the base of the 109-year-old Santa Monica Pier in Southern California, the Deauville Basin can harvest up to 1.6 million gal of storm water runoff from the pier’s downtown drainage basin. From there, storm water runoff is diverted for treatment at the Santa Monica Urban Runoff Recycling Facility and distributed for non-potable uses.
“The project, which bid in May 2017, was originally designed as a modular precast system,” said Shane Strick, project manager for Oldcastle Infrastructure. “After evaluation of the project’s unique design and specification requirements, Oldcastle proposed the use of a precast panel vault system in lieu of a conventional modular system as a value engineered solution.”
Creating the 262-ft long by 78-ft wide by 12-ft tall basin presented unique challenges due to soil and load obstacles. The basin was constructed on sandy soil with a water-table at grade and 15 ft of compacted backfilled soil supporting a surface parking lot over the basin. Additionally, the system needed to be water-tight when filled with up to 1.6 million gal of storm water runoff and pass a mandatory 24-hour leak test.
To meet these challenges, Deauville Basin was designed to withstand hydrostatic loads and hydrodynamic loads without any external support of backfill. The precast panel vault system used 191 precast wall panels and roof slabs.
“Oldcastle Infrastructure’s ability to recognize the need for pursuing an alternative solution that was both practical and economical was key in securing the project,” Strick said. “This successful design-build project was the result of an early and ongoing collaborative effort between the engineer of record, general contractor, [and] Oldcastle sales and engineer group in Southern California.”
Production of the panels and slabs at the Oldcastle plant in Fontana, Calif., began Jan. 30, 2018, and was completed March 26. From there, onsite installation went quickly, with installation beginning March 13 and concluding April 3.