S&S Coatings Inc., of Spokane, WA, has been awarded an $18,271,224 contract to clean and recoat the 28 spillway gates at the Garrison Dam in central North Dakota.
Stacey L. Gerhardt / U.S. Geological Survey
The dam, dedicated by President Dwight Eisenhower in 1953, impounds Lake Sakakawea on the Missouri River between Riverdale and Pick City, ND. The dam is home to a five-turbine power generating facility that provides up to 583,300 kilowatts of hydroelectric power, as well as the Garrison Dam National Fish Hatchery, operated by the U.S. Fish & Wildlife Service.
In June 2011, the U.S. Army Corps of Engineers, Omaha District, raised the dam’s emergency spillway gates for the first time (watch video) due to flooding on the Missouri River and Lake Sakakawea, releasing about 150,000 cubic feet per second down the spillway apron.
About the Project
Each spillway gate is 40 feet x 29 feet, with about 31,360 square feet of surface area. All of the gates will be abrasive blast-cleaned to a White Metal finish (SSPC-SP 5).
The upstream faces will then be coated with two coats of vinyl and two coats of aluminum vinyl; the downstream faces and trunnion arms will be coated with a zinc-rich vinyl primer, a vinyl intermediate, and a two-coat aluminum vinyl finish.
Containment will be required for removing the existing lead-bearing coatings. The contract requires SSPC-QP 1 and QP 2 certifications, and the contractor must employ a NACE- or SSPC-certified inspector to perform coatings inspection services.
The project also includes renewing the sacrificial anode cathodic protection system on the upstream faces of the gates. The contractor will install 13 new 24-pound magnesium anodes and 12 rope socket anodes to each gate.
Reported by Paint BidTracker, a construction reporting service devoted to identifying contracting opportunities for the coatings community. Visit us on Facebook!