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1 <br />' With the exception of the earthwork, all contractors were responsible for QC of their work. SRK <br />was contracted to provide support services for construction management performed by BMG, QA <br />' for the earthworks, and QA and QC for the liner installation. <br />Russell Engineering was contracted to supply survey sews and equipment for the tailings disposal <br />' area facilities and data for the as•bui(t drawings. <br />1 MINPROC was responsible for the design at interfaces to the mill facilities, including power supply <br />to the collection pond and sputter embanlmtent, the sputter embankment return water pumping <br />system, and the tailings delivery line outlet from the mill. All work designed by Minproc was <br />' performed by other subcontractors or BMG. <br />' Battle Mountain Gold took responsibility for pumping and dewatering in the area and assembly and <br />installation of the tailings delivery line and water return lines. <br />' Throughout the work, SRK maintained detailed records of the construction including daily activity <br />reports, liner subgrade acceptance forms, geosynthetic panel acceptance forms, laboratory test data, <br />and general construction related data. These files are on record with BMG at the project and in <br />SRK's Denver office. <br />' 2.0 IMPOUNDMENT EXCAVATIONS <br />' The majority of the tailings impoundment foundation was established in cut. Only several localized <br />arroyos were filled to establish the final grade within the impoundment. These fill areas are located <br />in the upper reaches of the lower impoundment along the north side of the impoundment. The <br />' tailings impoundment was constructed and shaped using a balanced cut and fill concept. The <br />impoundment foundations were cut below natural ground and excavated materials were used to <br />construct the embartlattents, the liner foundation, and the earthen drain blanket. <br />In general, the exposed geology of the tailing impoundment foundation consisted of the Santa Fe <br />formation, i.e., dense sands and gravels, with an alluvial plain located in the valley floor. The alluvial <br />materials in the valley floor were clean sands and gravels. The exposed horizons within the <br />' excavations indicated the water channels within the impoundment had changed location frequently <br />during the alluvial deposition. Very localized beds of clean sands and clean gravels were <br />encountered throughout the alluvial deposits. These materials generally fit within the Type 1 or <br />' Type 2 gradation limits. Many of the samples gradations fit within both the Type 1 and Type 2 <br />gradation limits. <br />' 3 <br /> <br />