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<br /> <br />STIPUTATION N0, 1 Page 2 <br />4 to 1. The low inslope will not allow the pond water or the slimes- <br />sand contact to progress to close to the berm which might result in <br />seepage or sloughing. If necessary compaction of the berm will be <br />accomplished by using a drum roller of sufficient weight to exert a <br />minimua pressure of 200 pounds per square inch. The starter dams and r <br />berms of the pond extentions will be constructed in the same manner. <br />The water from the slimes will never he permitted to reach an elevation <br />higher than 4 feet below the top of the berm, <br />Most of th.e water in the tailings pond evaporates but when in full <br />operation (500 tons per day mill capacity) water is decanted on the average <br />of twice per year. The quality of this water is governed by Camp bird's <br />NPD$S permit, Tl~e composition of lead-zinc tailings materials in the San Juans <br />contains enough clay which substantially reduces permeability and <br />effectively seats the pond water in. Therefore, by controlling the pond <br />water level by proper decanting the leakage along the sand-slime contact <br />is minimized if not completely eliminated. This may possibly he the <br />reason tce seep water hoe never occurred. Also, this system of proper ~ 'r <br />decanting of the water from the slime-sand contact results in a more <br />stable structure because the phreatic line is near the base of the <br />embanksient, thereby providing the maximum factor of safety. <br />Routine (daily) checks for seepage, piping, sloughing, etc. <br />will be made on f:he pond. At least 1 man is on the pond during milling <br />operations to operate the cyclone truck. <br />If deemed necessary seep water berms will be placed et the toe of the <br />pond extensions Bind wherever possible at the toe of the existing pond. <br />An evaporation pond will also be built to hold all seep water if deeaad <br />necessary. <br />At present Camp Bird Colorado, Inc, is planning to limit its <br />operations to at~~und 250 tons per day production. Since this is half <br />the mill capacity there will he ample time for proper maintenance <br />of the pond area. <br />