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San Juan County Mining Venture <br /> Job No. 3121K073 <br /> SCOPE OF SERVICES <br /> The scope of our services was to determine the stability of the <br /> old failure area in its current configuration, provide analysis of <br /> the present stability of Tailings Pond No. 1, and to analyze <br /> stability for the proposed configuration planned during <br /> reclamation. These plans entail reconstruction of the existing <br /> slope on the tailings pond to 2 . 5 : 1 (horizontal to vertical) . <br /> This will be accomplished by flattening the slope, moving material <br /> downhill except where the road is next to the base of the slope. <br /> Next to the road, existing materials will be removed from the face <br /> of the pond to construct the proposed configuration. Tailings <br /> excavated in this manner will be placed on the top surface of the <br /> pond, or at other areas at the base. <br /> The services provided by Western Technologies included: <br /> o Field reconnaissance by engineering staff; <br /> o Drilling and sampling of borings on the site; <br /> o Laboratory testing of subsurface materials; and <br /> o Geotechnical engineering analyses. <br /> Ten borings were drilled at the tailings pond during the field <br /> exploration of the site, to depths of 33 . 5 to 103 . 5 feet at the <br /> approximate locations shown on the site plan. During exploration, <br /> subsoils were visually examined and sampled at selected <br /> intervals . Soil sampling consisted of standard penetration, Dames <br /> and Moore ring samples, shelby tubes and bulk samples . Each test <br /> boring was cased with field slotted 2 inch PVC pipe for <br /> groundwater measurements . <br /> The following laboratory tests were performed on selected soil <br /> samples retrieved during the drilling operations : <br /> -3- <br />