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December 23. 1999 <br />Page 1-! <br />• During the baseline neriod, all Piceance Site monitoring wells that are completed in zones <br />above the Dissolution Surface (including in-panel and out-of--panel wells) will be sampled <br />monthly for water quality. The monthly water quality samples from wells completed above the <br />Dissolution Surface will be analyzed for the parameters on the WQ2 list. All Dissolution Surface <br />wells (in-panel and out-of-panel) will be monitored monthly for water level, conductivity, and <br />temperature. This baseline sampling frequency exceeds the CDMG requirement for the collection <br />of eight baseline measurements in a 5-quarter period. <br />During the operations neriod, Piceance Site in Hanel wells completed in zones above the <br />Dissolution Surface will be monitored monthly for water quality. The monthly water quality <br />samples from these in-panel wells will be analyzed for WQ 1 parameters monthly and WQ2 <br />parameters quarterly. Orrt-of--panel wells completed in zones above the Dissolution Surface will <br />be monitored quarterly. Water quality samples from these opt-of--panel wells will be analyzed for <br />WQ2 parameters. All Dissolution Surface wells (in-panel and out-of-panel) will be monitored <br />weekly for water level, conductivity, and temperature. <br />• At the Parachute Site, the alluvial monitoring well will be sampled for water quality on a <br />monthly basis. Samples will most likely be analyzed for WQ I parameters and/or other parameters <br />that are applicable [o the site characteristics and the processes in operation at the Parachute <br />facility. <br />Available domestic wells will be sampled for water quality on a quarterly basis during <br />both the baseline period and the operations period. Samples will be analyzed for WQ1 parameters <br />on a monthly basis. <br />Groundwater Quality Sampling Procedures <br />Groundwater samples will be collected according to the procedures outlined in <br />Appendix C. Sampling equipment will be decontaminated as described in Appendix D. <br />At the Piceance Site, American Soda has used EPA-approved, dedicated micropurge <br />systems, when possible, for water quality sample collection during the test mine phase. <br />Conventional water sampling techniques are not appropriate because of the significant depth of <br />most of the Piceance Site monitoring wells. The large volume of water in the well casing renders <br />purging tlvee casing volumes impractical. Therefore, American Soda will use dedicated <br />• micropurge systems in the collection of samples from monitoring wells at the Piceance Site. <br />Agapito Associates, Inc. <br />