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April 22, 1999 ~ ~ Page /3 <br />measurements will be taken in accordance with procedures detailed in Appendix B. Once per <br />quarter, the water quality parameters list will include the expanded set of parameters listed in WQ2 <br />(Table 3). The water quality samples will be collected in accordance with the procedures detailed <br />in Appendix C. <br />American Soda has used Environmental Protection Agency (EPA) approved, dedicated <br />micropurge systems, when possible, for water quality sample collection during the test mine phase. <br />Conventional water sampling techniques are not applicable because ofthe significant depth of those <br />monitoring wells. The large volume of water in the well casing renders purging three casing <br />volumes impractical. Therefore, American Soda will use dedicated micropurge systems in the <br />proposed monitoring wells. The exception to this sampling method are the monitoring wells <br />completed at the Dissolution Surface. <br />Micropurging has been unsuccessful at monitoring wells completed at the Dissolution <br />Surface because the high total dissolved solids (TDS) concentration promotes mineral precipitation <br />within the bladder pumps. Dedicated down-hole conductivity and temperature monitoring devices <br />will be used to monitor the Dissolution Surface. An approved Dissolution Surface sampling plan <br />will be in place for the baseline monitoring period. <br />3.4 Life-of--Mine Groundwater Monitoring Plan <br />When possible, monitoring and production wells used in the first panel will become <br />functional monitoring wells for subsequent mine panels. New wells will be placed where existing <br />wells do not provide adequate coverage. The monitoring plan proposed for the +5 year phases will <br />be refined in concert with the BLM and DMG based on the groundwater flow chazacteristics defined <br />by the 0-5 year monitoring plan. Up to five production wells will be completed as duel monitoring <br />wells once solution mining has ceased and the cavity has been plugged and sealed. Production wells <br />can be completed in two stratigraphic intervals, to be determined to best meet the long-term <br />monitoring needs. <br />3.5 Monitoring after Cessation of Commercial Operations <br />At such time as the Yankee Gulch Project may permanently cease commercial operations, <br />there may be a need for continued monitoring of the hydrologic system. In the event that the project <br />permanently ceases commercial operations, American Soda will continue to monitor the hydrologic <br />Agapito Associates, Inc. <br />