2016-10-24_REPORT - C1994082 - Laserfiche WebLink

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Ground Water Water Levels. Table 3 provides a summary of ground water monitoring sites at the Yoast Mine. Water level data are provided in Appendix B. For each well water level reports for the past ten years are presented immediately after the water level hydrograph of all data since 1991. Water level measurements are collected with an electrical water level indicator or a steel tape. Pressure readings (in psi) obtained from flowing wells with pressure gages are multiplied by 2.31 to obtain head in feet. The current ground water monitoring program is presented in Table 15-8 of the Yoast Mine PAP. Ground Water Level Summary. This year, water levels at all wells fell within their historic ranges, except for wells YSAL3 and YOV30. Overburden Well YOV30 exhibited its lowest water level this year with a value of 133.44 feet to water. YSAL3 exhibited its highest water level this year with a value of 2.04 feet to water. All alluvial wells exhibit distinct seasonal water level fluctuations in response to periods of precipitation recharge or the lack of precipitation. Overburden and coal well water levels are fluctuating in response to the precipitation recharge and induced ground water flow to the reclaimed mine pits. Ground Water Quality. Table 3 provides a summary of ground water monitoring sites at the Yoast Mine. Tables 4a and 4b show the new (2010) ground water parameter lists. Appendix C provides all ground water quality data collected during this year, along with sampling remarks. This is followed by a plot of TDS versus time for the entire period of record. The regression line on this plot is generated by a method known as LOWESS which is an acronym from Locally Weighted Scatter plot Smoothing (Cleveland, 1979). Unless otherwise noted, smoothness factor (SF) of 1 (on a scale of 0 to 1) was used, which gives maximum smoothing. 3