The GIWW West Closure Complex is a $1 billion hurricane storm surge (flood) protection facility for the city of New Orleans and surrounding areas. This Early Contractor Involvement (ECI) contract included one of the world’s largest interior drainage pump stations and one of the nation’s largest navigable floodgates (225 feet). The pump station has 11 units and is capable of discharging storm water at a rate of 19,140 cubic feet per second.
The scope of work included demolition of the existing hopper bottom, metal roofed reservoir, the construction of a new 20 MG cast-in-place reservoir, installation of chemical feed piping, level sensors, transmitters and associated conduits and control wiring.
Kiewit was selected by the City of Somerton for the expansion of their Sequential Batch Reactor (SBR) Wastewater Treatment Plant (WWTP). Prior to the design commencing, Kiewit performed cost modeling and constructability reviews to aid in the determination if a Biological Nutrient Removal Process (BNR) design would be more beneficial than the original concept. Kiewit provided anticipated construction costs and schedules for the conversion of the existing SBRs to a BNR. Kiewit performed the same analysis in developing the cost and schedule for the construction of additional SBRs. These side by side comparisons allowed the selection of the best value expansion approach for the WWTP. The BNR approach was selected and increased the current .8 MGD to 1.8 MGD for an addition of .6 MGD in capacity from the original concept.
The Union Hills Water Treatment Plant Rehabilitation project involved the complete replacement and upgrade of half of the plant’s 5kV electrical feed, including construction of a new electrical building expansion and 2,500+ LF of new ductbank installation amidst numerous existing utilities. New electrical switchgear and motor control equipment were furnished to upgrade the plant’s finished water pump systems.
A Kiewit-led joint venture excavated over 40,000 ft. of an 18- and 25-ft.-dia. tunnel to develop the Exploratory Studies Facility (ESF). The ESF was constructed to determine the suitability of storing high-level nuclear waste. A unique feature of the project was the use of a "mapping gantry" to provide safe access for project geologists and scientists during excavation.
By partnering with the U.S. Army Corps of Engineers, Kiewit finished this project four months ahead of schedule. Phase I involved excavating, blasting and preparing the spillway's foundation. Because blasting occurred beside the existing dam and near a heavily-traveled highway, expertise in controlled blasting and seismic monitoring was essential.
Working at a depth of 80 feet, crews from Kiewit Pacific Co. pumped groundwater from the excavation site at a rate of 14 million gallons per day to construct New Natomas and South River Pumping Stations. The scope of work at each site involves excavation support, dewatering, constructing new below-grade and at-grade concrete structures and installing mechanical equipment.
East Dam is one of three dams constructed for the Metropolitan Water District of Southern California's Eastside Reservoir program. Holding more than 260 billion gallons of water, the reservoir doubles Southern California's surface storage capacity. At 180 feet high and 1,200 feet wide at the base, East Dam is the longest of the three dams.