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At such time as the Yankee Gulch Project may permanently suspend commercial operations, there may be a need for continued monitoring of the surface water system beyond shut-down of the plant and well field. In the event that the project permanently suspends commercial operations, American Soda will continue to provide support to the USGS to monitor the surface water system for a time period as required to complete monitoring. American Soda will consult with the BLM and CDMG to determine the extent and time frame for post closure hydrologic monitoring. 5.0 Process Monitoring The solution mining process will be monitored according to the schedule and criteria presented in this section. All process monitoring data will be included in monitoring reports that will be submitted monthly to the regulatory agencies (described in Section 6.0). Details of the process monitoring schedule and criteria aze presented in Table 5. Parameter 0 Monitoring Recording Frequency In'ectionPressure Automatic-Per Well ]Ominuie In'ection Tem mture Automatic -Per Well 10 minute In'ection Densi Automatic -Per Well 10 minute In'ection Flow Rate Automatic -Per Well 10 minute Production Pressure Automatic-Per Well 10 minute Production Tem rature Automatic -Per Well 10 minute Production Densi Automatic -Per Well 10 minute Production Flow Raze Automatic -Per Well ] 0 minute Nitro enConsu tion Manual-Per Well Dail Nitrogen Pressure Automatic -Per Well 10 minute U er and Lower Production Stream an d In'ection Stream Water uali CP List Manual uarterl Carbon Dioxide Manual Monthl when o eratin Methane Manual Monthl when o eratin BTEX Manual Monthl when o eratrn Oil and Grease Manual Monthl when o ratin TCLP Parameters and pH Manual After Start-up or when significant rocess condition than a occurs 5.1 Solution Mining Wells Since no solution mining wells will be in operation during a temporary suspension period, it will not be possible to monitor pertinent parameters in association with the mining. Observations will be made of production flow and pressure monitors periodically to confirm temporary suspension status for regulatory compliance and reporting. Once commercial production resumes, solution mining wells will be monitored for pressure, temperature, flow rate, and density of inflow and outflow at 10-minute intervals. The data will be recorded at 10-minute intervals and recorded in a central control system. Operational samples will be collected for cazbon dioxide, dissolved organic carbon, BTEX (benzene, toluene, ethyl benzene, and xylenes), oil and grease, and methane from the process Draft Modification No. 9 LTIC Area Permit No. C030858-00000 Page 33 of 44