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Huddleston -Berry <br />Engineering & Testing, LLC <br />- co <br />Bowie Resources, LLC <br />43659 Bowie Road <br />Paonia, Colorado 81428 <br />Attention: Mr, Bill Bear <br />Subject: Vibrating Wire Piezometer Monitoring <br />Bowie Coal Waste Disposal Area No. 2 <br />Paonia, Colorado <br />640 White Avenue <br />Grand hinclton, CO 81501 <br />Phone: 970 - 255 -8005 <br />Fax: 970- 255 -6818 <br />HuddlestonBerryCC?bresnn.nel <br />www.HBET- GJ.com <br />June 11, 2014 <br />Project #01349 -0001 <br />Reference: Stability) &alualion, Technical Revision #85, Gob Pile #2 Djying fI1•ea, Bowie <br />No. 2 kline by Huddleston -Berry Engineering & Testing, LLC for Bowie <br />Resources, LLC, June 3, 2014. <br />Dear Mr. Bear, <br />At the request of the Colorado Division of Reclamation, Mining and Safety (DRMS), <br />Huddleston -Berry Engineering & Testing, LLC (HBET) prepared this letter regarding monthly <br />monitoring of vibrating wire piezometers at Coal Waste Disposal Area No. 2 (CWDA No. 2) at <br />the Bowie mine near Paonia, Colorado, The intent of the monitoring was to detect significant <br />changes in the pore water pressures within the coal waste which may impact the stability of the <br />waste pile. <br />Monitoring <br />Between 2005 and 2012, a total of ten vibrating wire piezometers were installed in CWDA No. <br />2. However, several of the piezometers have been damaged or have otherwise ceased to <br />function. Currently, five of the piezometers are functional. <br />Monitoring of the functioning piezometers was completed by Buckhorn Geotech, Inc. (BGI) on <br />May 21st, 2014. In addition, during a quality control review of the piezometer data, BGI <br />identified an error in the pore pressure calculations for VWP -08, VWP -09, and VWP -10. BGI <br />determined that the mathematical error resulted in higher pore pressures in these piezometers. <br />Tile actual pore pressures were lower than previously reported. <br />