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Ground Water <br />Water Levels. <br />Table 3 provides a summary of ground water monitoring sites at the Yoast <br />Mine. Water level data are provided in Appendix B. For each well water <br />level reports for the past ten years are presented immediately after the <br />water level hydrograph of all data since 1991. Water level measurements <br />are collected with an electrical water level indicator or a steel tape. <br />Pressure readings (in psi) obtained from flowing wells with pressure gages <br />are multiplied by 2.31 to obtain head in feet. The current ground water <br />monitoring program is presented in Table 15-8 of the Yoast Mine PAP. <br />Ground Water Level Summary. <br />This year, water levels at all wells were within their historic ranges, <br />except for wells YOV30 and YW30. Well YOV30 exhibited a historic water <br />level low this year with a value of 133.64 feet to water. Well YW30 <br />exhibited a historic water level high this year with a value of 136.12 <br />feet to water. All alluvial wells exhibit distinct seasonal water level <br />fluctuations in response to periods of precipitation recharge or the lack <br />of precipitation. Overburden and coal well water levels are fluctuating <br />in response to the precipitation recharge and induced ground water flow <br />to the reclaimed mine pits. <br />Ground Water Quality. <br />Table 3 provides a summary of ground water monitoring sites at the Yoast <br />Mine. Tables 4a and 4b show the ground water parameter lists. Appendix C <br />provides all ground water quality data collected during this year, along <br />with sampling remarks. This is followed by a plot of TDS versus time for <br />the entire period of record. The regression line on this plot is generated <br />by a method known as LOWESS which is an acronym from Locally Weighted <br />Scatter plot Smoothing (Cleveland, 1979). Unless otherwise noted, <br />smoothness factor (SF) of 1 (on a scale of 0 to 1) was used, which gives <br />maximum smoothing. <br />3 <br />