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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That is the basics of turquoise in a very general way. For the past few years, there is all kinds of dyed blue, white, pink, orange, red, etc., stone coming out of China that is labeled as stabilized turquoise.