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' • INTRODUCTION • <br />This report contains the results of our geotechnical <br />engineering evaluation of the northeast slope for the existing <br />Tailings Pond No. 2 at the Sunnyside Mine, located <br />' approximately 1 mile north of Silverton, Colorado. The purpose <br />of these services is to: <br />' Provide results of field and laboratory testing; <br />Determine the possibility of a slope failure of the <br />tailings into Boulder Creek; <br />Determine the stability of the slope if reconstructed <br />to a 2:1 (horizontal to vertical); <br />' Determine the ability of the tailings pond to support <br />additional fill during reclamation; and <br />Evaluate the stability of the pond under pseudo-static <br />' (seismic) considerations. <br />' EXISTING CONSTRUCTION <br /> The existing tailings pond is approximately 600 by 600 feet in <br />' plan dimension at the top of the embankment with a maximum <br /> existing height of approximately 120 feet on the so utheast <br />' side. The bottom of the pond is approximately 850 by 850 <br /> feet. Existing slopes are on the order of 1.2 to 1 (horizontal <br />' to vertical). <br /> The north side of the pond, at the base of the steep slope is <br />' bound by Boulder Creek. The south and southeast base of the <br /> pond is bound by existing dirt roads. The northwest side of <br />1 the pond abuts against the mountain to the north. The Animas <br /> River is located several hundred feet southeast of the existing <br />' pond. <br />' SITE CONDITIONS <br /> The exterior surface of the tailings pond primarily consists of <br />' sands, and the interior at the surface consists of clayey silts <br />1 <br />' <br />~ <br />