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' Tailings Pond N • • <br />Sunnyside Mine <br />' Silverton, Colorado <br />Project No. 3120K114 <br />' Surface soils to depths of 7 to 46 feet in test borings 4, and <br />5 through 9 were found to be sand tailings of loose to medium <br />' density and none to low plasticity. The near surface materials <br />in test borings 3, and 5 through 9 to depths of 9 to 116 feet <br />' were found to be sandy or clayey silt (slimes) of soft to firm <br />consistency and low to medium plasticity. Scattered lenses, or <br />' interfingered sections of sand tailings were encountered in the <br />slime fraction. The material encountered above the natural <br />soils in test borings 3, and 5 through 8 consist of sand. <br />' Natural soils underlying the tailings encountered in the <br />borings, and extending to the full depth of exploration <br />consisted of sandy clays, and/or gravel and cobbles. <br /> Groundwater: During this investigation, groundwater was <br />' encountered in test borings 5, 6, 8 and 9. Perforated PVC open <br /> well piezometers we re placed in all test borings to monitor the <br />' groundwater levels. Groundwater el evations, and the depth of <br /> the groundwater in the piezometers as measured on August 17, <br />' 1990 are presented in the following table: <br />' Piezometer Elevation Depth. Ft.* <br /> 1 9643.6 No Water <br /> 2 9640.2 No Water <br />' 3 9635.4 No water <br /> 4 9641.4 No Water <br />' 5 9636.8 79.3 <br /> 6 9633.9 76.3 <br />' 7 9634.3 No Water <br /> 8 9633.1 91.3 <br /> 9 9631.6 94.8 <br /> *Measured from the surface at each test boring. <br />i~ <br />I 1 <br />-4- <br /> <br />