2019-03-11_REPORT - C2009087 (2)

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Ground Water Water Levels. Water level data are presented in Appendix B. The table of contents of Appendix B indicates wells with PSCM monitoring requirements (all other wells were required by the old Seneca II Mine permit). Water level reports for data collected since 2006 are presented immediately after the water level hydrograph of all historic data for each respective well. By presenting all historic data, trends related to seasonal and annual variability and possible mining -related impacts are more evident. Table 3 (Summary of Ground Water Monitoring Wells) is presented as a reference for the reader. No monitor wells were completed or abandoned this year. The ground water monitoring program is presented on pages 7- 341/342 of the Seneca II PAP and on Table 2.04.7-T9, page 2.04-104 (Vol. 1) of the PSCM PAP. Water level measurements obtained in non -flowing wells are taken with a water level indicator, or in the case of a few shallow alluvial wells, directly from a steel tape. Pressure readings (in psi) obtained from flowing wells with pressure gages are multiplied by 2.31 to obtain head in feet. For the sake of brevity, the prefix that precedes all well names will be dropped throughout this report (except in the case of nested wells with a similar number). As an example, Well SCAL46 may be referred to as Well 46. Ground Water Level Summary. This year, all seven monitoring wells exhibited water levels within their historical ranges. All alluvial wells show distinct seasonal water level fluctuations in response to periods of precipitation recharge or the lack of precipitation. Overburden and coal well water levels display fluctuation in response to precipitation recharge, induced ground water flow to the reclaimed mine pits, and in some cases, changes in reservoir water levels. Spoil well water levels still indicate that only the furthest downslope highwall portions of the spoil exhibit significant amounts of saturation. 5