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material and subsequent stability effects, and the problems of <br />ground water contamination associated with the seepage, as well <br />as to comply with upcoming regulatory requirements. These moni- <br />toring plans are discussed in detail in the following recommen- <br />dations. <br />It is recommended that: <br />(1) Homestake Mining Company install their V -notch weir <br />downgradient of the improperly installed U.S. Forest <br />Service V -notch weir, so as to permit careful moni- <br />toring of the rate of seepage from the toe. Consi- <br />deration should be given to the possibility of <br />installation of a continuous stage recorder keyed <br />to the zero point on the V -notch weir, permitting <br />a continuous record of the flow to be maintained. <br />In the absence of this, Homestake Mining Company <br />should read the flow of the V -notch weir preferably <br />daily and no less frequently than every three days, <br />and plot the data to see any upward trend in flow. <br />Homestake should also arrange for bimonthly collec- <br />tion of a sample of the seepage. The samples should <br />be appropriately preserved, in accordance with Table <br />6-4 of "Monitoring Industrial Waste Water" and ana- <br />lyzed for the parameters on the attached Table 1. <br />(2) Homestake Mining Company should proceed as soon as <br />possible with the plans for the peripheral discharge <br />of slimes around the tailings basin. This should <br />lessen the head acting on the seepage channels, and <br />-7- <br />