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1 <br />1 <br />1 <br /> <br />1 <br />1 <br />1 <br /> <br />Draft: March 31, 1999 Page 12 <br />pazameters listed in the Colorado Department of Public Health and Environment-Water Quality <br />Control Commission-Regulation No. 41-Basic Standazds for Ground Water and Regulation <br />No. 31-Basic Standazds and Methodologies for Surface Water. <br />3.4 Life-of--Mine Groundwater Monitoring Plan <br />Monitoring and production wells used in the first panel will become functional monitoring <br />wells for subsequent mine panels. New wells will be placed where existing wells do not provide <br />adequate coverage. The monitoring plan proposed for the +5 year phases will be refined based on <br />the groundwater flow chazacteristics defined by the ~5 yeaz monitoring plan. Up to five production <br />wells will be completed as duel monitoring wells once solution mining has ceased and the cavity has <br />been plugged and sealed. Production wells can be completed in two stratigraphic intervals, [o be <br />determined to best meet the long-tear monitoring needs. <br />' 4.0 SURFACE WATER MOlv1TORING PLAN <br />' The surface water monitoring plan includes monitoring Piceance Creek and monitoring for <br />changes in spring and seep occwrences at the Yankee Gulch Lease (upper plant) site, and Pazachute <br />' Creek at the Parachute Creek (lower plant) site. There are no other sowces of surface water at the <br />Yankee Gulch Lease or Pazachute Creek sites except intermittent streams, which aze not indicators <br />' for any monitoring issues. Rainfall will also be gauged at the Yankee Gulch Lease site since run-off <br />and infiltration contribute to swface water and groundwater, respectively. <br />4.1 Piceance Creek Monitoring <br />Piceance Creek monitoring will include discharge and water quality, a baseline transit study, <br />' and crest stage monitoring. Piceance Creek will be monitored at two existing USGS stream gauging <br />' stations. One of the gauging stations is located downstream of Ryan Gulch and upstream of the <br />Yankee Gulch Lease site. The other gauging station is located on Piceance Creek at the confluence <br />with the White River, downstream of the site. <br />The baseline dischazge and water quality of Piceance Creek, in the vicinity of the site, has <br />' been established by the USGS. The surface water stations will be monitored fow times per yeaz <br />according to the current USGS schedule, dwing the baseline monitoring period and during <br />1 <br />' Agapito Associates, Inc. <br />