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<br /> <br /> <br />1 <br /> <br /> <br /> <br />1 <br /> <br />1 <br />1 <br />1 <br /> <br /> <br /> <br /> <br />1 <br /> <br />Draft: March 24, 1999 • ~ Page 11 <br />of less than I gpm will be designated a seep. A feature with a flow rate of greater than or equal to <br />1 gpm will be designated a spring. <br />The baseline flow rates and water quality of springs and seeps within the lease boundary wi II <br />be established for approximately 1 yeaz prior to the start of commercial solution mining operations. <br />The springs and seeps will be monitored on a twice per year basis, in the spring and fall of each yeaz, <br />corresponding to high flow and low flow conditions. During these monitoring events, the tlow rate <br />will be measured, and features having sufficient flow and access will be sampled for the water <br />quality parameters listed in Table 3. The water quality samples will be collected according to EPA <br />approved procedures. The occurrence of springs and seeps that were not documented in the baseline <br />surveys will be documented during subsequent surveys. <br />4.0 PROCESS MONITORING <br />The solution mine process plant, solution mining wells, and associated plumbing will be <br />monitored according to the schedule and criteria presented in this section. All process monitoring <br />data will be included in monitoring reports that will be submitted monthly to the BLM. Details of <br />the process monitoring schedule and criteria are presented in Table 4. <br />Solution mining wells will be monitored for pressure, temperature, flow rate, and density of <br />inflow and outflow at 10-minute intervals. The data will be recorded at 10-minute intervals and <br />reported to a central alarm system. <br />Potential leakage from a solution cavity will be monitored by instantaneous mass fluid <br />balance calculations which will be automatically reported to a master computer located in the control <br />room. This procedure is also used to predict cavity growth. Cavity growth will be controlled <br />vertically by a nitrogen gas cap. The nitrogen gas cap will be monitored daily by measuring nitrogen <br />consumption. <br />The solution and cooling ponds will be protected against leakage by a double geosynthetic <br />liner and geonet leak detection and collection system (LCDS), which will be monitored twice per <br />shift. The freeboazd of the dams will be measured twice per shift. Daily water level measurements <br />and monthly water quality samples will be collected from the one existing alluvial monitoring well, <br />21-3, and the two proposed monitoring wells, 28-1 and 21-5. <br />Agapito Associates, Inc. <br /> <br />