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Draft: March 31, 1999 LJ 1 1 1 1 1 1 Table 4. Process Monitoring Schedule Page I S Parameter Monitoring Recording Frequency Production Well Injection Presswe Automatic 10 minutes Injection Temperatwe Automatic 10 minutes Injection Specific Gravity Automatic 10 minutes Injection Mass Flow Automatic l0 minutes Discharge Presswe Automatic ]0 minutes Dischazge Temperatwe Automatic 10 minutes Discharge Specific Gravity Automatic 10 minutes Dischazge Flow Automatic 10 minutes Nitrogen Consumption Manual daily Nitrogen Presswe Automatic 10 minutes Carbon Dioxide Manual monthly Methane Manual monthly BTX Manual quarterly dioxide, dissolved organic cazbon, BTX (benzene, toluene, xylene), oil and grease, and methane from the process stream. These pazameters will be monitored on a monthly basis during the baseline monitoring period and during mining operations. Potential leakage from a solution cavity will be monitored by instantaneous mass fluid balance calculations and nitrogen consumption, which will be automatically reported to a master control system. The nitrogen gas cap will be monitored daily by measwing nitrogen consumption and presswe. 5.2 Solution and Cooling Ponds The solution and cooling ponds associated with the test mine facility will be protected against leakage by a double geosynthetic liner and geonet leak detection and collection system (LCDS), which will be monitored twice per shift. The freeboazd of the dams will also be measwed once per day. Daily water level measwements and montlily water quality samples will be collected from the one existing alluvial monitoring well, 21-3, and the three proposed monitoring wells, 28-1, 21-5, and 19-3. Agapito Associates, Inc.