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The Acid Base Potential tests conducted on the trench rock proved <br /> that it has a net neutralization potential . Approximately 25, 000 <br /> cubic yards of this rock were excavated and stockpiled during <br /> construction of the Diversion Trench in 1981 . <br /> As illustrated on the typical fill cross-section, a French Drain <br /> composed of trench rock will be constructed on the accessible <br /> perimeter of the lake hole . The purpose of this French Drain is <br /> to divert subsurface water away from the waste inside its <br /> perimeter. <br /> The bottom of the French Drain will be in the throat of the 2580 <br /> stope. Directly below the French Drain a buffer zone will be <br /> constructed . The buffer zone will be approximately 20 feet thick <br /> and will also be composed of trench rock. <br /> The space inside the French Drain is to contain waste. As <br /> depicted on the attached cross-section, its volume is about <br /> 64 , 000 cubic yards. It is not possible to decrease this volume <br /> and still maintain a three percent grade for drainage. It is <br /> possible to raise the entire grade if more volume is needed for <br /> waste storage. <br /> The waste will probably be deposited by end dumping, dozing, or a <br /> combination of both. Little effort will be made at compaction <br /> since the waste is primarily shot rock and is susceptible to very <br /> little compaction or subsidence. <br /> - 8 - <br />