WASTEWATER

WATER/WASTEWATER

Yucca Mountain

Nye County, Nev.

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.

24th Street Water Treatment Plant Rehabilitation

Phoenix, Arizona

Originally constructed in the 1950's, the 24th Street Water Treatment Plant is a conventional water treatment facility that has the capacity to treat 140 MGD per day. This project rehabilitated the flocculation basins, sedimentation basins, filter valves, raw water inlet pipe, sludge blowdown pipeline inspection, main switchgear, and other electrical equipment.

Raw Water Pump Station and Pipeline from Union Hills Water Treatment Plant to Cave Creek Water Reclamation Plant

Phoenix, Arizona

This project provided the ability to supply untreated Central Arizona Project (CAP) water from the Union Hills Water Treatment Plant to the Cave Creek Water Reclamation Plant, utilizing approximately 5,000 LF of 24-inch HDPE pipe.

Magnolia Trunk Sewer Rehabilitation

Orange County, Calif.

This $15 million project will perform condition assessment, design, and construction to rehabilitate a portion of the existing Magnolia Trunk Sewer in the cities of Fountain Valley, Westminster, and Garden Grove, CA.

Bonneville Fish Bypass

North Bonneville, Wash.

This award-winning project allows migrating salmon and steelhead trout to bypass the Bonneville Dam and travel safely through the Columbia River. Kiewit Pacific Co. ultimately constructed a 3,000-ft.-long, high velocity concrete chute with 25-ft.-high walls to transport fish around the dam and through a new channel outfall.

P1-102 Activated Sludge

Fountain Valley, Calif.

This $208 million project involves upgrading the Orange County Wastewater Treatment Plant No. 1 in Fountain Valley, CA. The upgrade, which will add a secondary treatment capacity of 60 MGD, is slated to be complete by 2012.

Sacramento Regional Primary and Grit Handling Areas Rehabilitation

Sacramento, Calif.

Kiewit Pacific Co. was awarded an $18 million contract to rehabilitate 12 rectangular primary sedimentation tanks. Crews will replace grit slurry piping and grit overflow piping in grit handling areas as well as constructing related structural, mechanical and electrical work.

Everglades Pump Stations G-404 and G-409

Broward, Fla.

Kiewit Southern Co. was awarded this $6.5 million contract for Pump Stations G-404 and G-409 as part of the South Florida Water Management District's goal of restoring the Everglades to its previously ecologically balanced condition.

Everglades Pump Station G-337

Palm Beach County, Fla.

Part of restoring the Everglades to an ecologically balanced condition by reducing levels of phosphorous in the water created from farmland storm water run-off, the $2.3 million project included installing a new intake and pump station in Palm Beach County, Fla. Due to the remote location in the Everglades, Gilbert Southern Corp. maintained an on-site office throughout construction.

Somerton Wastewater Treatment Plant Expansion

Somerton, Ariz.

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.