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Anri172. /999 • • Pane 19 Monitoring systems will be in place at the solution well trunk line (upstream of the steam stripper) prior to raising average cavity temperatures above 300°F to provide Basel ine data for carbon dioxide, dissolved organic carbon, BTX (benzene, toluene, xylene), oil and grease, and methane from the process stream. These parameters 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 measuring nitrogen consumption and pressure. 5.2 Solution and Cooling Ponds The solution and cooling ponds associated with the test mine facility (Figure l) 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 freeboard of the dams will also be measured once per day. Daily water level measurements and monthly water quality samples will be collected from the one existing alluvial monitoring well (21-2) and the three proposed monitoring wells (28-1, 21-5, and 19-3). An alluvial monitoring well will be constructed at the Yankee Gulch Lease site, downstream of the proposed pond at the upper plant, to monitor for potential pond leakage. This well will be located and constructed in consultation with the BLM. Several alluvial monitoring wells are in existence at the Parachute Creek plant site. These wells were installed and monitored previously by Unocal as part of their environmental protection program. One or more of these wells will serve as monitoring wells for the planned ponds to be constructed at the Parachute Creek (Unocal) site. American Soda will select wells and/or construct new wells through consultation with the BLM. 5.3 Pipclinc Monitoring The pipeline that recirculates water from the Parachute site to the Yankee Gulch site will be monitored. The parameters and related sampling frequencies are listed in Table 7. Agapito Associates, Inc.