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Quarterly Inspection Report -Refuse Pile October 9, 2018 <br />Twentymile Coal Company-Foidel Creek Mine <br />Job No 99-3983 Page 2 of 2 <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 September 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 155,219 tons of waste coal during the <br />month of July 2018: approximately 138,614 tons during August 2018: and approximately 138,250 tons <br />during September 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 (RW#1) was measured at <br />57.08 feet below the existing ground surface (bgs) on July 801, at 56.96 feet bgs on August 26d, and at 56.93 <br />feet bgs on September 22nd of 2018. The water level in the eastern monitor well (RW#2) was measured at <br />56.34 feet bgs on July 81', at 56.14 feet bgs on August 20 and at 56.10 feet bgs on September 22nd of <br />2018. An additional monitor well (RW#3) was constructed at the southeast end of the lst bench in new <br />Expansion Area in June of 2014. The water level in the expansion area monitor well (RW#3) was dry when <br />checked on July 81`, August 26h and September 22"d of 2018. <br />Based on our observations, it appears that the pile is currently being constructed and maintained in general <br />accordance with the project specifications and plans submitted under 2.05.3(8) and that the potential hazard <br />to human life and property at the site in its present condition is minimal. This report fulfills the quarterly <br />inspection requirements as specified by Rules 4.09.1(11)(a), 4.09.l(11)(b), 4.10.2(2)(a) and 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. Travis, P <br />Sr. Project En ' 0LSC <br />PN ,, <br />Reviewed barh4i D. <br />Principal' <br />cc: Tabetha Lynch NOP, 'l Protection Specialist - CDRM&S <br />NWCC, Inc. <br />