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1 <br />' inch PVC pipe. The hole is monitored on a monthly basis. No water has been detected in RM-1 <br />to date. If detected, the water level will be measured and samples collected quarterly to be <br />analyzed for the parameters listed in Table 2-1. <br />' During October 1984, the Taylor Draw Reservoir facilities were completed and the reservoir <br />began filling with water. The area around the alluvial groundwater holes has become a shallow <br />water mud flat area with the deposition of mud, silt and sand at high reservoir levels. As a result, <br />' alluvial groundwater monitoring holes Qal-1, Qal-2, Qal-3, Qal-4 and Oal-6 have been <br />destroyed and are no longer available for monitoring. Alluvial hole Oal-5 is still being monitored. <br />' During May 1987, Iongwall panel 1 was mined past the location of 2-12U. The location was <br />subsided and the monitoring hole could no longer provide usable data. Accordingly, Western <br />' Fuels submitted an application Tor a Technical Revision on 617/88 to eliminate groundwater <br />monitoring at 2-12U. The Technical Revision has subsequently been approved. <br />' 2.2 Summary and Analysis of Deserado Mine Hydrology Data <br />' Data collected during this water year (Oct. 1, 1990 to September 30, 1991) have been <br />summarized and compared with the data from the baseline hydrology inventory. Surface water <br />and ground water discussions are presented separately in the following sections. <br />2.2.1 Surface Water Data Surface water data has been collected from five (5) stations in the <br />Deserado Mine area. The locations of these stations are shown on Plate 1 in the pocket of this <br />report. With the exception of the White River, stream flow in the Deserado Mine area is <br />' ephemeral with flows occurring only in response to rapid snow melt or during heavy thunder- <br />storms. Gaging stream flow and collecting water samples is therefore dependent upon being able <br />to collect samples and gauge flow while the flow event is occurring. Heavy thunderstorms can <br />' result in flash floods which destroy the sampling and gauging stations. Station SW24-1 has been <br />destroyed twice, the last time in the Spring of 1983. Up until July 1986, this station was a 'grab <br />' sample' location where samples were taken as soon as possible after significant thunderstorms <br />and during snow melt run off. Anew single stage sampler was installed in July 1986. Other <br />stations have been plagued with problems such as the samplers silting in and the gauging <br />' apparatus silting in. These problems are corrected as soon as possible but there is no guarantee <br />that the next flow event will not also plug the sampling and gauging apparatus. <br />' The data collected from the surface water monitoring program during the hydrology reporting year <br />is contained in Appendix B. The statistical summary of the data is also included in Appendix B. <br /> <br /> <br />5 <br /> <br />