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' Draft: March 2~F, 1999 • • Page 10 ' wells will be completed as duel monitoring wells once solution mining has ceased and the cavity has ' been plugged and sealed. Production wells can be completed in two stratigraphic intervals, to be determined to best meet the long-term monitoring needs. ' 3.0 SURFACE WATER MONITORING PLAN The surface water monitoring plan includes monitoring Piceance Creek and monitoring for ' changes in spring and seep occurrence at the site. There are no other sources of surface water on the Yankee Gulch lease site except intermittent streams, which are not indicators for any monitoring issues. 3.1 Piceance Creek Monitoring ' Piceance Creek will be monitored at two existing U.S. Geological Survey (USGS) stream ' gauging stations. One of the gauging stations is located downstream of Ryan Gulch and upstream of the Yankee Gulch Lease site. The other gauging station is located on Piceance Creek at the ' confluence with the White River, downstream of the site. The baseline dischazge and water quality of Piceance Creek, in the vicinity of the site, will be established for approximately 1 yeaz prior to the start of commercial solution mining operations. The surface water stations will be monitored on a once per month basis. During these monitoring ' events, the discharge will be measured and Piceance Creek will be sampled for the water quality parameters listed in Table 2. Once per annual quarter, the water quality pazameters list will include the expanded set of pazameters listed in Table 3. The water quality samples will be collected according to EPA approved procedures. ' 3.2 Spring and Seep Monitoring Springs and seeps will be monitored for flow rate and water quality. A Spring season ' baseline spring and seep survey will be conducted during the peak flow period in late spring of 1999. A second spring and seep survey will be conducted prior to commercial operations in the fall of 1999 ' to document low flow conditions. The spring locations will be determined by map and compass ' methods, and the locations will be documented on a base map. The flow rate will be measured by direct measurement where sufficient flow rates exist and by visual estimation where direct ' measurement is not practical due to low flow or an obstructed source. A feature having a flow rate Agapito Associates, Inc.