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.'. -4- 19. The operator will submit to the Office the results of leach tests for WAD cyanide and metals and acid generation for Pad 2 material proposed for use as liner material (Section 4.7, March 8 Adequacy Response letter) prior to pad application, 20. The operator will provide adequate heap leach detoxification which will be determined according to the following manner. la) Pregnant pond solutions will have maintained WAD cyanide concentrations of 0.2mg/L or less for at least two full years following completion of cyanide detoxification. (b) After the determinations set forth in item (a) above have been made and compliance has been met, successful detoxification of the heap leach pad will be verified via drilling of the heap leach pad. Drilling shall be conducted at a spacing demonstrated by the company to be statistically valid to represent the leachable water quality regulatable components of the heap leach pad. Drill samples shall be analyzed for all water quality-regulated components, said analyses consisting of at least one full analytical suite per drill hole. (c) Provided successful detoxification is not met according to items (al and (bl above, the heap leach pad shall be rinsed and re-sampled until successful detoxification is met. (d) Upon successful detoxification of the heap leach pad, as described in items (a) and Ib) above, the pad liners shall be perforated by the operator but not until written permission is provided by the Office. Following perforation of the liners, surface water and groundwater shall be monitored for a minimum of five years. Provided any monitoring sample shows exceedences of water quality parameters, monitoring shall continue for five years following report of said exceedance. (el No part of the reclamation bond shall be released until the operator demonstrates successful pad detoxification and that applicable water quality standards can be met at Arequa Gulch monitoring point 1.5, and groundwater monitoring compliance points in Arequa Gulch and Wilson Creek. 21. All applicable stipulations (as determined by the Office) approved in Amendment No. 5 are fully enforceable. 22. The operator will not disturb areas proposed in Amendment No. 6 until clearance is given by the Bureau of Land Management. A copy of such clearance must be provided to the Office prior to disturbance. 23. The operator shall sample and test at a frequency adequate to characterize the metals and acid generating potential of any final pit floor or bench rock within 20 days after initial exposure if that rock contains greater than .5 percent sulfides. Testing methods will be approved by the Office. The operator will forward the results of tests to the Office within ten working days of receipt of the results. If the Office determines that the generation and release of acid and/or metals has the potential to violate applicable water quality standards