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Draft: March 31, 1999 3.2 Groundwater Quality Sample Collection 1 LJ 1 Page 11 Groundwater sample collection criteria have been established for the baseline data collection period and the commercial mining operations period. These criteria include sampling frequency and groundwater parameters. The parameters that groundwater samples will be collected for include WQ 1 shown in Table 2 and Water Quality Pazameters list 2 (WQ2) shown in Table 3. Groundwater samples will be collected in accordance with procedures detailed in Appendix C. During the baseline, 13-month monitoring period, all available monitoring wells will be sampled on a once per month basis. This schedule exceeds Colorado Departrnent of Natural Resources, Division of Minerals and Geology (DMG) requvements of eight baseline measurements in afive-quarter period. During commercial operations, the monitoring wells located within the active mine panel will be sampled montlily. Monitoring wells located outside the active mine panel will be sampled quarterly. American Soda has used Environmental Protection Agency (EPA) approved, dedicated micropurge systems for water quality sample collection during the test mine phase. Conventional water sampling techniques are not applicable because of the significant depth of those monitoring wells. The large volume of water in the well casing renders purging three casing volumes impractical. Therefore, American Soda will use dedicated micropurge systems in the proposed monitoring wells. The exception to this sampling method aze the monitoring wells completed at the Dissolution Surface. Micropurging has been unsuccessful at monitoring wells completed at the Dissolution Surface because the high total dissolved solids (TDS) concentration promotes mineral precipitation within the bladder pumps. Dedicated down-hole conductivity and temperature monitoring devices will be used to monitor the Dissolution Surface. An approved Dissolution Surface sampling plan will be in place for the baseline monitoring period. 3.3 Groundwater Quality Analytical Parameters Water quality analyses will be conducted for the parameters listed in WQ1, presented in Table 2 . Water quality analyses will be conducted less frequently for a more comprehensive list of parameters, designated WQ2 (Table 3). These lists of parameters have been developed from discussions with the BLM, the DMG and American Soda, and are in accordance with applicable Agapito Associates, Inc.