2012-04-27_REPORT - C2009087 (2)

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15.59 inches, which was 6.84 inches (78 %) above the 1971 -2000 average, 8.75 inches. Ground Water Water Levels Water level data are presented in Appendix B. The table of contents of Appendix B indicates which wells carry PS.CM monitoring requirements (all other wells were required by the old Seneca II Mine permit). Water level reports for data collected since 2000 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 clearly 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 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, water levels at all wells fell within their historic ranges, with the following exceptions. Wadge Underburden Well SWU8P1 continues with a long -term decrease in water levels. Lower Grassy Creek Alluvial Well SGAL70 displayed its lowest water levels on record in September of both 2010 and 2011. Beaver dams (or lack thereof) affect ground water levels in this stretch. Wadge Underburden Well SWU6 displays an increasing trend. Spoil Well SSP61 exhibited its highest water level on record in May. CR