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Meteorological Data <br />Data from the National Climatic Data Center's Hayden Station is used <br />here to evaluate the precipitation trend. These data are provided in <br />Appendix Al. Precipitation data is summarized on Table 2. For this year, <br />21.25 inches of precipitation was measured, which is 3.13 inches (17 %) <br />above the 1981 -2013 average, 18.12 inches. All months except December, <br />February, April, June and September were above average. Snowpack runoff, <br />as estimated by totaling November through March precipitation values, <br />was 7.93 inches, which was 0.63 inches (8.6 %) above the 1981 -2013 <br />average, 7.30 inches. <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 ten 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, except for well YOV30. Overburden Well <br />YOV30 exhibited its lowest water level this year with a value of 129.26 <br />feet. All alluvial wells are showing distinct seasonal water level <br />fluctuations in response to periods of precipitation recharge or the <br />lack of precipitation. Overburden and coal well water levels are <br />fluctuating in response to the precipitation recharge, induced ground <br />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 />2 <br />