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' Battle Mountain Resources, Inc. <br />' 06 July 1993 <br />Page 5 <br />' tend to be influenced predominantly by shear stresses. The <br />importance of element placement therefore is important during <br />the reduction of pore pressure data. <br />Due to the fine grained nature of the tailings, the piezo- <br />element was located behind the tip. <br />' Cone penetration testing was utilized for the project due to <br />the following environmental concerns: <br />- The cone penetrometer and its associated sampling <br />equipment produced its own hole. There were virtually <br />no cuttings or tailings generated at the ground surface <br />requiring disposal. <br />- The cone test was a dry test and there were no <br />contaminated drilling fluids requiring disposal. <br />- The cone and the sounding rods were the only equipment <br />which came in contact with the tailings. <br />' - All sampling was conducted inside an environmentally <br />controlled unit, thereby greatly reducing pea'sonnel <br />exposure. <br />' - Testing was very rapid. <br />The cone penetration tests were conducted in accordance with <br />specifications as outlined in American Standard for Testing <br />Materials (ASTM) Section D-3341. The sounding logs are <br />presented as Appendix A. <br />2.3 Pore Pressure Dissipation Testinv <br />' The piezocone test soundings were also conducted 4or the <br />evaluation of permeability coefficients. Dissipation besting <br />' was conducted at several depths at each location and values <br />of permeability were calculated by measuring the rate of <br />decay of the excess pore pressures generated by pushing the <br />cone through the tailings. This rate of decay is a function <br />' of the permeability of the tailings. <br />' 2.4 Solution Samp ling <br /> Subsequent to the PCPTs, solution sampling was attempted at <br /> one location near PCPT S-O1. An in-situ sampling system <br />' known as the BATR system was utilized. <br /> When sampling with the BATR system, each component of the <br /> system is sealed and hydraulic interconnections between <br />' TERRA TECHNOLOGIES-SOUTHWEST, INC. <br />