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. DESCRIPTION OF THE HYDROLOGIC MONITORING PROGRAM The hydrologic program followed for the Carbon Junction Mine for the 1997 water year is described below. With the approval of Technical Revision 03 in April 1997, the hydrologic monitoring program was modified. Technical Revision 03 modified the sampling frequency for springs and groundwater wells to semi-annual, with the exception of groundwater well 95-1, which was to be sampled quarterly in 1997, and semi-annually thereafter. The springs to be monitored were identified as I, 2, and 4. The groundwater wells to be monitored were 17-B, 82-1, 82-4, and 95-1. During the review of Technical Revision 08 in 1997, an in-depth analysis of the hydrologic monitoring program was undertaken. It was acknowledged that several springs and groundwater wells had been either mis-identified or identified with multiple designations. The hydrologic monitoring program was modified in the permit text to clearly identify the springs and groundwater wells to be sampled. The springs which were sampled in Water Year 1997 were Spring l (Upper Carbon Junction Canyon), Spring 3 (REA Spring #3), and Spring 4 (CJ-LO-SPG #4). These springs will continue to be sampled on asemi-annual schedule when flowing. The groundwater wells which were monitored pursuant to Technical Revision 08 in Water Year 1997 were 17-B (upgradient of the mine), 94-1 (located mid-mine), and • 95-1 (located downgradient of the mine). Well 95-1 was monitored on a quarterly basis in calendar year 1997. Well 95-1 will be monitored on a semi-annual basis thereafter. Wells 17-B and 94-1 were monitored on a semi-annual basis during Water Year 1997. Wiring Monitoring Spring 1 (C.J. Canyon Up) did not flow during Water Year 1997. This spring has been dry since the early 1980's. Spring 3 (REA SPG #3) and Spring 4 (CJ-LO-SPG #4) were monitored semi-annually during calendar year 1997 and a total of three times during Water Year 1997. When flow occurred, monitoring included afull-suite laboratory analysis as well as field parameters of pH, conductivity, temperature, and flow. Well Monitorine Wells 17-B, 94-1, and 95-1 were monitored semi-annually during calendar year 1997 and a total of three times during Water Year 1997. A full-suite analysis of parameters was conducted along with a field analysis of pH, temperature, depth to water, and electrical conductivity. • -2-