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SUNDAY MINE COMPLEX-HYDROGEOLOGIC REPORT <br /> The results of the slug test analysis showed low hydraulic conductivity values for the Top Rim <br /> Sandstone of the Salt Wash Member downgradient of the SMC area. Appendix F presents the <br /> slug test data and plotted recovery curves. <br /> 10.2 Water Level Measurement <br /> Water level measurements are collected in the monitoring wells and at selected vent shafts <br /> through the use of a portable water-level indicator tape (sounder) with an audible alarm. <br /> Measurements are made prior to a water quality sampling event and on other occasions as <br /> needed. Multiple measurements are made each time a well is measured to assure an accurate <br /> depth to water is recorded. <br /> 10.2.1 Monitoring Well Water Levels <br /> A compilation of monitoring well water levels are shown in Table 8-1 and plotted against time in <br /> Graphs 8-1 thru 8-3. Water levels have been measured almost exclusively prior to conducting <br /> water quality sampling at the wells. It is noted that water levels amongst the three monitoring <br /> wells are divergent from a uniform trend. A discussion on monitoring well groundwater levels is <br /> provided in Section 11.0, Interpretation. <br /> 10.2.2 Vent Shaft Water Levels <br /> Similar methods are used in measuring water levels at vent shafts. Vent shaft measurements <br /> allow for an assessment of the potentiometric surface within the Salt Wash Member within the <br /> mines, and indicates the location of potential flooded workings. Few vent shaft measurements <br /> were made in the past, but PRM will include vent shaft monitoring measurements on an annual <br /> basis in the future. In October 2019, PRM assessed the vent shafts at the SMC to determine <br /> which shafts could practicably be measured, including the presence of fans, and which shafts <br /> were already known to be flooded or dry. As a result of this assessment, the following vent <br /> shafts were located: <br /> Vent Shaft ID October 2019 Findings <br /> S-8 Measured water level: 508.5 ft below top of cover <br /> S-4 Measured water level: 547.2 ft below top of cover <br /> S-15 Measured water level: 570.75 ft below top of cover <br /> WS-3 Measured water level: dry <br /> Western Water& Land, Inc. 32 <br />