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Mica Dam
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BC Hydro Mica Station

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Revelstoke, BC

Client: BC Hydro

Discharge Point: 1) Plant drainage system - Columbia River.

  2) Ground

BC Hydro’s Mica Dam 150 km north of Revelstoke is the first dam on the Columbia River and one of the largest earthfill dams in the world. The Generating Station was originally constructed to hold six generating units, however only four units were installed at the time of construction in 1973. BC Hydro is installing two new 500 megawatt generating units, with construction to be completed by early 2016.

Stormtec was contracted to assist BC Hydro with site water management during the construction. In early 2015 Stormtec installed a modular water treatment system consisting of pH adjustment, filtration, liquid phase GAC adsorption and cation exchange units designed to bring pH to an acceptable range and to reduce concentrations of metals and hydrocarbons. During the first phase of the project Stormtec treated water to meet BC Water Quality Guidelines for the Protection of Freshwater Aquatic Life. The water was first discharged into a plant drainage system containing an oil-water separator and sediment knock-out chamber, then into the Columbia River.

At a later stage of the project, Stormtec upgraded the system with additional adsorption and ion exchange units due to high fluctuations in construction water quality. The upgraded system discharged the treated water to the ground rather than into the plant-drainage system to reduce the cost of the monitoring program. The project was successfully completed in July 2015.

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