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• 1997 Annual hydrologic Report <br />Page 6 <br />elevations in these piezometers. Table G97-3 was prepared to show statistics on these <br />water levels corresponding to high and low flows in the adjacent river. UTL-01, -02 and <br />-03 water levels were higher than the average for the site. UTL-04 showed a lower <br />than normal water levels except the July measurement which was above average. <br />These averages may not be a true representation of the statistics for the sites due to <br />the sharp change in water level measurements before and after the end of 1986 when <br />monitoring personnel changed. Data page GD-12 contains the result of full suite water <br />analysis done on UTL-02 and 04 during the Year. Diagrams G97-11 and 12 are <br />trilinear representations of these water analysis. The circles' size on the Trilinear <br />diagrams indicate a relative amount of TDS, the larger the circle the higher the TDS. <br />Both sites showed about a 5°l° increase in TDS concentration this Year. <br />A former mine dewatering hole located at the North Decline area of the mine is now <br />being used to monitor the water level in the abandoned portions of the Roadside South <br />Portal. It is monitored primarily to keep it within a 10' zone between the bottom of the <br />siphon for outfall 002 and the reclaimed Northwest Intake Portal. The results of <br />monitoring are included in the Mine Water section, Table M97-3. <br />In order to characterize the Rollins Sandstone two surface and two underground wells <br />were installed during June 1997. The surface wells were installed at the north decline <br />and the unit train loadout. The underground wells were installed in the North and <br />South Portals. Depth to water ranged from 56.5 feet below grade in the North Decline <br />well to artesian in the North Portal well. Monitoring of these wells will continue in <br />accordance with permit requirements. Depth to water data is presented on data page <br />GE-1. Quality information is presented on pages GE-2 through GE-5. <br />The Rollins Sandstone wells are numbered Rollins 1, 2, 3 & 4 on data page GE-1. <br />Rollins-1 is an underground well located in the North Portal and is under artesian <br />conditions. Rollins-2 is located at the unit train loadout. Rollins-3 is located at the <br />north decline. Rollins-4 is an underground well located in the South Portal. <br />I~ <br />