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- 4 - <br />temporary storage pile will be maintained until approximately <br />12,000 tons of material accumulate. At this time, the rock will be <br />pneumatically placed into the mine stopes. <br />Storage tanks will be surrounded by earth berms sufficient in <br />height to contain spills. An elastomeric lining material will be <br />utilized on the ground surface below the concrete vats and product <br />tanks. The membrane will also be utilized to line the inside of the <br />concrete vats. <br />If plant operation conditions Change significantly from those <br />described above, we should be notified to re- evaluate the <br />recommendations contained in this report. <br />FIELD INVESTIGATION <br />The field investigation for the project was conducted in <br />December 1979 and January 1980. Field investigation consisted of a <br />reconnaissance of the plant ,site and mine by the project geologist and <br />the project soil engineer, the logging of 10 exploratory test pits by <br />the project soil engineer, conducting six in -situ permeability tests <br />in the mine stopes and measuring ground water levels in the several <br />existing exploratory holes on the JD-5 lease. <br />Exploratory Test Pits: Ten exploratory test pits were excavated in <br />the overburden soils with a tractor -- mounted 1/4 yard backhoe. The <br />locations of the exploratory test pits are shown on Fig. 2. <br />Elevations and coordinates for the test pits were determined by Gates <br />& Fox Company, Inc. <br />Samples of the subsurface materials encountered were obtained by <br />driving a 2 -inch I.D. thin - walled brass sampling tube into the soils <br />