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Meteorological Data <br />No meteorological data is collected at the Yoast Mine. Data from the <br />National Climatic Data Center's Hayden Station is used here to evaluate <br />the precipitation trend. These data are provided in Appendix Al. <br />Precipitation data is summarized on Table 2. For this year, 12.80 inches <br />of precipitation was measured, which is 4.54 inches (26%) below the <br />1971 -2000 average, 17.34 inches. A11 months except November, February, <br />July and September were below average. Snowpack runoff, as estimated by <br />totaling November through March precipitation values, was 5.35 inches, <br />which was 1.83 inches (26 %) below the 1971 -2000 average, 7.18 inches. <br />Ground Water <br />Water Levels. Table 3 provides a summary of ground water monitoring <br />sites at the Yoast Mine. Water level data are provided in Appendix B. <br />Water level reports for the past seven years are presented immediately <br />after the water level hydrograph of all data since 1991. Water level <br />measurements are collected with an electrical water level indicator or a <br />steel tape. Pressure readings (in psi) obtained from flowing wells with <br />pressure gages are multiplied by '2.31 to obtain head in feet. The <br />current ground water monitoring program is presented in Table .15 -8 of <br />the Yoast Mine PAP. <br />Ground Water Level Summary. This year, water levels at all wells fell <br />within their historic ranges. All alluvial wells are showing distinct <br />seasonal water level fluctuations in response to periods of <br />precipitation recharge or the lack of precipitation. Overburden and coal <br />well water levels are fluctuating in response to the precipitation <br />recharge, induced ground water flow to the reclaimed mine pits. <br />Ground Water Quality. Table 3 provides a summary of ground water <br />monitoring sites at the Yoast Mine. Table 4a and 4b show the new (2010) <br />ground water parameter lists. Appendix C provides all ground water <br />quality data collected during the past two years, along with sampling <br />remarks. This is followed by a plot of TDS versus time for the entire <br />2 <br />