A bund consists of: an impervious bund wall or embankment surrounding the facility or tanks. an impervious floor within the bunded area. any joints in the floor or the wall, or between the floor and the wall.
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The finest turquoise is now located in a part of the mine so difficult, that it is almost unattainable. The turquoise is a good quality stone of high blue color with an intermittent black or brown, non-webbed matrix. The high-grade Candelaria is a translucent dark blue with a redish brown spiderweb matrix.