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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What Paula says is right all turquoise has to be stabilized as the stone is soft and brittle. stabilizing is accepted and does not interfere with the cost. Enhancement though is a different story because if the stone is actually dyed than it is no longer natural. You have to find out what kind of enhancement has been done.