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640 White Avenue <br /> Grand Junction, Colorado 81501 <br /> Phone: 970-255-8005 <br /> Fax: 970-255-6818 <br /> Info@huddlestonberry.com <br /> <br /> January 8, 2018 <br /> Project#01349-0001 <br /> <br />Bowie Resources, LLC <br />43659 Bowie Road <br />Paonia, Colorado 81428 <br /> <br />Attention: Mr. Bill Bear <br /> <br />Subject: Summary of Instrumentation Monitoring <br /> 4th Quarter 2017 <br /> Bowie Coal Waste Disposal Area No. 3 <br /> Paonia, Colorado <br /> <br />Reference: Summary of Instrumentation Monitoring, 3rd Quarter 2017, Bowie Coal Waste <br />Disposal Area No. 3, Paonia, Colorado by Huddleston-Berry Engineering & <br />Testing, LLC for Bowie Resources, LLC, October 11, 2017. <br /> <br />Stability Evaluation, Gob Pile #3, Bowie No. 2 Mine by Huddleston-Berry <br />Engineering & Testing, LLC for Bowie Resources, LLC, July 15, 2014. <br /> <br />Dear Mr. Bear, <br /> <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 quarterly <br />monitoring of vibrating wire piezometers at Coal Waste Disposal Area No. 3 (CWDA No. 3) 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 />Vibrating Wire Piezometers <br />Five vibrating wire piezometers were installed in CWDA No. 3 in October 2014. The <br />piezometers were installed at three locations within the footprint of the gob pile. Monitoring of <br />the functioning piezometers was completed by DOWL on December 20th, 2017. The attached <br />monitoring report prepared by DOWL includes the piezometer monitoring data and the data is <br />summarized in the following table. <br /> <br />VWP ID Initial Pore <br />Pressure <br />10/31/14 <br />(psi) <br />09/20/17 Pore <br />Pressure <br />(psi) <br />12/20/17 Pore <br />Pressure <br />(psi) <br />Difference Since <br />Installation <br />(psi) <br />Difference Since <br />Last Reading <br />(psi) <br />VWP-A Deep 10.4 4.3 3.9 -6.5 -0.4 <br />VWP-A Shallow 4.7 3.9 3.8 -0.9 -0.1 <br />VWP-B Deep 0.2 0.3 0.1 -0.1 -0.2 <br />VWP-B Shallow 13.9 12.0 11.8 -2.1 -0.2 <br />VWP-D 7.1 7.0 6.3 -0.8 -0.7