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April 22, /999 ~ • Page 11 <br />developed from discussions with the BLM, the DMG and American Soda, and are in accordance <br />with applicable parameters listed in the Colorado Department of Public Health and <br />Environment-Water Quality Control Commission: Regulation No. 41-Basic Standards for <br />Ground Water and Regulation No. 31-Basic Standards and Methodologies for Surface Water. <br />3.3 Groundwater Quality Sample Collection and Frequency <br />Groundwater sample collection criteria have been established for the baseline data collection <br />period and the commercial mining operations period. These criteria include sampling frequency and <br />groundwater pazameters. The parameters that groundwater samples will be collected for include <br />WQl shown in Table 2 and WQ2 shown in Table 3. Groundwater samples will be collected in <br />accordance with procedures detailed in Appendix C. The groundwater sampling schedule is <br />summarized in Table 4. <br />Table 4. Summary of Groundwater Monitoring Schedule <br />Baseline Period <br />(Five quarters prior to During Commercial <br />Commercial Operations) Operations <br />In-panel Wells <br />Monthly (WQ2) <br />Monthly (WQ 1) <br />Out-of--panel Wells <br />Domestic Wells <br />In-panel Dissolution <br />Surface Water Level <br />Monthly (WQ2) <br />Quarterly (for State drinking <br />water compliance) <br />Monthly (water level only) <br />Quarterly (WQ2) <br />Quarterly (for State drinking <br />water compliance) <br />Continuous (water level only) <br />During the baseline period (five-quarter monitoring period) all available monitoring wells <br />will be sampled on a once per month basis. This schedule exceeds (DMG) requirements of eight <br />baseline measurements in afive-quarter period. During commercial operations, the monitoring <br />wells located within the active mine panel will be sampled monthly. Monitoring wells located <br />outside the active mine panel will be sampled quarterly. <br />The groundwater monitoring wells will be monitored on a once per month basis during the <br />baseline monitoring period. During these monitoring events, the elevation ofthe groundwater level <br />will be measured and the well will be sampled for WQl (Table 2) parameters. Water level <br />Agapito Associates, [nc. <br />