2017-02-13_REPORT - C1981041 (3)

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2016 AHR Page 5 conducted for the Year. The monitoring wells associated with GWMS01 A&B, GWMS02 A&B, and GWMS03 A&B were plugged and abandoned on August 24, 2016. A copy of the abandonment report is attached. Piezometers CRDA-01 thru 06 at the Cameo Refuse Disposal Areas (CRDA) No. 1 and No. 2 were monitored the first quarter of the 2016 Water Year. Data page GC -25 includes measurements for this Year. A graphical representation of the water level elevations in the CRDA Piezometers is shown on Diagram G16-4. The water levels in CRDA-01 and CRDA-01A were stable this Year. Piezometers CRDA-02, 03, 04, 05 and 06 have been damp to dry for the past five years (2011 — 2015). The water levels in the PZ-# piezometers were all below their critical depths. A graphical representation of the water levels in the nested piezometers is shown on diagrams G16-7, 8, 9 and 10. The monitoring was suspended for these piezometers with the approval of TR67 on February 23, 2016. The piezometers were removed and backfilled in May 2016 as specified on page 14-31 of SCC's permit document. The past results of water level measurements at the unit train loadout are listed on Data page GB -2. Monitoring of these piezometers was discontinued with the approval of SL -7 in April 2011 and the UTL-01, UTL-02, UTL-03 and UTL-04 piezometers were sealed and reclaimed on May 17, 2011. The Well Abandonment Reports were included in DRMS's quarterly report dated July 7, 2011. No monitoring was performed during the Year. A former mine dewatering hole (N-1) located at the North Decline area of the mine is used to monitor the water level in the abandoned portions of the Roadside South Portal. Since discharge point 016 was put into service, the water level in N-1 is virtually constant and it is expected to stay at an elevation of about 4758. The results of monitoring N-1 are presented in Table M16-2. In order to characterize the Rollins Sandstone two surface and two underground wells were installed during June 1997. The surface wells, Rollins -2 and Rollins -3, were installed at the unit train loadout and the north decline respectively. The underground wells, Rollins -1 and Rollins -4, were installed in the North and South Portals respectively. Depth to water ranged from 56.5 feet below grade in the North Decline well to artesian in the North Portal well. Monitoring of these wells was performed in accordance with permit requirements. Prior depth to water data is presented on data page GE -1-1. Rollins -1 was sealed in December 1999 and Rollin -4 was sealed in April 2000. Rollins -2 and 3, with the approval of SL -7, were sealed in May 2011. The Well Abandonment Reports were included in DRMS's quarterly report dated July 7, 2011. No monitoring was performed during the Year. Mine Water There was no annual mine inflow study performed this Year since one was performed during December 1999 and reported in the 1999 report. Since the North and South Portals have been sealed, there will not be any additional mine inflow studies.