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~ ~ <br />n O <br />r ~ <br />~a <br />a ~ <br />o ~" <br />~~ <br />~ O ~ <br />n " <br />a <br />v <br />`:focus is to prevent storm waters from <br />reaching pit area; design of mining is <br />a self-contained area - storm water is <br />trapped and evaporates - letting nothing <br />leave pit. The well-used area between <br />excavation and highway drains into a ditch <br />which carries it for irrigation purposes or <br />delivers it to a reservoir site where any <br />sediment can be deposited. <br />• <br />• <br />y y <br />~ ~ <br />~ ~ <br />~~ <br />