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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If I see a strand of beads being sold as North American turquoise and the price is very low, I become very suspect of the true origin. There is turquoise mined in China that is similar in color to some of the North American mines that some vendors attempt to pass off as turquoise from the US.