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U.S. DOE, Office of Environmental Management. 5 Dec 2017

Similar to other legacy facilities, dozens of buildings with old galvanized metal roofs at the Savannah River Site are now leaching zinc that mixes with rain runoff. This runoff presents a potential issue as the rainwater travels from the construction facilities to a roadside drainage ditch leading to a stream. The SRS operations contractor is using oyster shells to address the zinc drainage. Workers piled small rocks and limestone gravel to create check dams that slow the stormwater as it moves through the ditch. They placed a large mound of oyster shells on the upstream side of each dam. The shells draw zinc from the water as it pools before entering the nearby waterway. In another SRS location, the shells have been installed to absorb copper. The installation of four oyster shell check dams at a cost of $7,600 allows the facility to avoid the expense and inconvenience of replacing large portions of structures, including galvanized fencing and metal roofing. https://www.energy.gov/em/articles/zinc-half-shell-srs-puts-old-oysters-new-use

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