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Quarterly Inspection Report -Refuse Pile December 7, 2018 <br />Twentymile Coal Company-Poidel Creek Mine <br />Job No ' 99-3983 Pam 2 of2 <br />will be monitored during future inspections and noted in our inspection reports. Photographs of the seepage <br />area taken at the time of our inspection on December 28, 2018 are attached. <br />Based on our observations, the surface drainage conditions, generally appeared to be adequate across the <br />top and sides of the pile. Based on our observations, we did not observe any signs of instability, structural <br />weakness or hazardous conditions at the refuse pile. <br />We were advised that the wash plant had produced approximately 117,202 tons of waste coal during the <br />month of October 2018: approximately 174,349 tons during November 2018: and approximately 155,008 <br />tons during December 2018. It is our understanding that the fines being produced at the wash plant, which <br />consists of approximately 10 to 20 percent of the total materials being produced, are being pumped <br />underground into the mine. <br />We were previously informed by Brian Watterson of Peabody that all of the original monitor wells installed <br />in the Refuse Pile were destroyed in July 2012. Two new monitor wells were constructed in Area 1 of the <br />Refuse Pile in December 2013. NWCC was provided monthly monitor well readings for this quarter by <br />Miller Water Monitor Service, Inc. The water level in the western monitor well (RW91) was measured at <br />57.02 feet below the existing ground surface (bgs) on October 21 ", at 57.10 feet bgs on November 41" and at <br />57.14 feet bgs on December 16", of 2018. The water level in the eastern monitor well (RW#2) was <br />measured at 56.21 feet bgs on October 21", at 56.21 feet bgs on November 4a' and at 56.19 feet bgs on <br />December 16°i of 2018. An additional monitor well (RW#3) was constructed at the southeast end of the I" <br />bench in new Expansion Area in June of 2014. The water level in the expansion area monitor well (RW#3) <br />was dry when checked on October 21", November 4°i and December 16°' of 2018. <br />Based on our observations, it appears that the refuse pile is currently being constructed and maintained in <br />general accordance with the project specifications and plans submitted under 2.05.3(8) and that the <br />potential hazard to human life and property at the site in its present condition is minimal. This report fulfills <br />the quarterly inspection requirements as specified by Rules 4.09.1(11)(a), 4.09.1(11)(b), 4.10.2(2)(a) and <br />4.10.2(2)(b). <br />If you have any questions regarding this report or our observations, please contact this office. <br />Sincerely, <br />NWCC, INC., <br />Timothy S. Tray' <br />Sr. Project <br />c ' <br />cc: Tabetha 4;�,„tV?Ii i(jj'�YaI Protection Specialist - CDRM&S <br />NWCC, Inc. <br />