PaintSquare.com
Follow us on Twitter Follow us on LinkedIn Like us on Facebook Follow us on Instagram Visit the TPC Store
Search the site

 

Advertisement

PaintSquare


Coatings Industry News

Main News Page


CA Awards $274M Contract for Dam Repairs

Wednesday, April 19, 2017

More items for Program/Project Management
More items from North America

Comment | More

Repairs to the damaged Oroville Dam in California will cost more than $275 million, according to the contract awarded to a major American infrastructure contractor.

Kiewit Corp., based in Omaha, submitted the low bid of $275.4 million for the reconstruction of the dam’s main spillway, where major concrete erosion triggered emergency measures in February in the midst of heavy rains. The bid shattered state officials’ estimates, which had put the job at about $220 million. The state announced Monday (April 17) that it had awarded the contract to Kiewit.

Oroville damage
Images: Kelly M. Grow / California Department of Water Resources

The $275 million contract includes repairs to both the main spillway—which revealed a crater nearly as long as a football field in early February and was shut down—and the auxiliary spillway.

Higher bids came from Barnard Construction Co., ($277 million) and a Teichert Construction-Granite Construction joint venture ($344.1 million), according to the Sacramento Bee.

The contract includes repairs to both the main spillway—which revealed a crater nearly as long as a football field in early February and was shut down—and the auxiliary spillway, which was employed for the first time, and sustained erosion that threatened the stability of a concrete weir.

Officials ordered the evacuation of about 188,000 people for nearly two days in mid-February amid concerns that the weir could give way, sending a wall of water rushing downstream.

Work Schedule

The California Department of Water Resources, which oversees the dam and awarded the repair contract, says “no regrets work,” including road construction and slope stabilization, has already begun, and Kiewit has been given a notice to begin work. Work will take place in multiple phases, the DWR says, and details will not be disclosed to the public for security reasons.

Auxiliary spillway damage

The use of the auxiliary spillway, which had never been put into service before, caused erosion on the hillside extending down from the lake.

The goal is to have the work complete by Nov. 1, ahead of California’s rainy season.

Water has flowed on and off down the main spillway since the original shutdown. Most recently, it was put back into action April 14 with limited flows to relieve the rain-swollen Lake Oroville.

The DWR says as of April 17, 1.6 million cubic yards of debris had been removed from the debris pile at the bottom of the main spillway.

New Failure Analysis

On Tuesday (April 18), the Los Angeles Times reported on a new independent failure analysis asserting that flaws in the original design of the dam left it vulnerable to structural problems. The review, issued by University of California Berkeley’s civil engineering professor emeritus Robert Bea, says that the concrete floor of the spillway was not made thick enough, and did not call for continuous steel reinforcement.

Oroville spillway damage

UC Berkeley professor emeritus Robert Bea says the failure occurred at the spillway's "weakest point."

According to the Times, Bea says the spillway failed “at its weakest point," an area over a clay drain pipe where the concrete floor is just 4-6 inches thick. Bea says the drain pipe itself was likely clogged by tree roots, causing an uplifting force exerted on the concrete above it.

Bea recommends taking a hard look at similar dams throughout the state and beyond to assess whether unforeseen issues like those at Oroville could be looming.

“This is not an Oroville problem,” he told the Times. "It is a state problem and a national problem.”

   

Tagged categories: concrete; Contractors; Failure analysis; Government contracts; Infrastructure; Locks and dams

Comment Join the Conversation:

Sign in to our community to add your comments.

Advertisements
 
Waterjet Technology Association (WJTA)
 
Click to register today!
 
See the latest automated and handheld UHP waterblasting tools/systems/products. Exhibits, live demos, educational sessions, waterjet short course, networking.
 

 
SAFE Systems, Inc.
 
SAFE Systems'
Blast Lights &
Deadman Switches
 
Halogen or LED blast lights available with our NEW urethane bumper. Switches available in many colors for color coding your hoses.
 

 
Tarps manufacturing, Inc.
 
QUALITY MADE IN AMERICA —Available near you!
 
CLICK to get a behind-the-scenes look at how Tarps Manufacturing makes the highest-quality tarps right here in the USA — available nationwide.
 

 
SABRE Autonomous Solutions
 
Quality
 
The ALPHA1 provides a consistent finish day-in
day-out; job to job.
 

 
W Abrasives
 
Optimize your blasting process and operations!
 
Blasting is a complex process that goes above and beyond the simple question of the shot used, no matter how innovative and efficient it is. W Abrasives is there to help.
 

 
Detail Masters
 
Overspray Removal
 
We offer professional, turnkey service and unparalleled quality!
Our process can save hundreds— even thousands of dollars. It's fast, environmentally safe and 100% guaranteed.
 

 
Clemco Industries Corp.
 
Maximum Dust Suppression Systems Start at $14,950
 
The system comprises proven technology and equipment with user-friendly flexibility in mind. See it in action.
 

 
SSPC: The Society for Protective Coatings
 
http://www.sspc.org/
 
Join SSPC and Enhance
Your Career !
 

 
Monti Tools, Inc.
 
BRISTLE BLASTER® – THE ORIGINAL ONE
 
  • Abrasive blast with a power tool
  • Remove corrosion, mill scale and coatings
  • Cleans & roughens
  • Meets SSPC-SP 10 / NACE No. 2
  • Profile up to 4.7 mils
  • ATEX Zone 1
  •  

     
    Aggreko
     
    Dehumidification, Power and Temperature Control Rentals
     
    Aggreko offers rental solutions for your painting/coating project. Dehumidifiers, cooling, heating, power and 24/7 service, nationwide.
    844-433-9802
     

     
     
     

    Technology Publishing Co., 1501 Reedsdale Street, Suite 2008, Pittsburgh, PA 15233

    TEL 1-412-431-8300  • FAX  1-412-431-5428  •  EMAIL webmaster@paintsquare.com


    The Technology Publishing Network

    Durability + Design PaintSquare the Journal of Protective Coatings & Linings Paint BidTracker

     
    EXPLORE:      JPCL   |   PaintSquare News   |   Interact   |   Buying Guides   |   Webinars   |   Resources   |   Classifieds
    REGISTER AND SUBSCRIBE:      Free PaintSquare Registration   |   Subscribe to JPCL   |   Subscribe to PaintSquare News
    MORE:      About PaintSquare.com   |   Privacy policy   |   Terms & conditions   |   Site Map   |   Search   |   Contact Us