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j Huddleston -Berry <br />M Engineering & Testing, LLC <br />-- c <br />Bowie Resources, LLC <br />43659 Bowie Road <br />Paonia, Colorado 81428 <br />Attention: Mr. Bill Bear <br />Subject: Summary of Instrumentation Monitoring <br />1St Quarter 2015 <br />Bowie Coal Waste Disposal Area No. 3 <br />Paonia, Colorado <br />640 White Avenue, Unit B <br />Grand Junction, Colorado 81501 <br />Phone: 970-255-8005 <br />Fax: 970-255-6818 <br />HuddlestonBerry @Bresnannet <br />April 20, 2015 <br />Project #01349 -0001 <br />Reference: Vibrating Wire Piezometer Monitoring, Bowie Coal Waste Disposal Area No. 3, <br />Paonia, Colorado by Huddleston -Berry Engineering & Testing, LLC for Bowie <br />Resources, LLC, February 26, 2015. <br />Stability Evaluation, Gob Pile 93, Bowie No. 2 Mine by Huddleston -Berry <br />Engineering & Testing, LLC for Bowie Resources, LLC, July 15, 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 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 March 11th, 2015. The attached <br />monitoring report prepared by DOWL includes the piezometer monitoring data and the data is <br />summarized in the following table. <br />VWP ID <br />Initial Pore <br />Pressure <br />10/31/14 <br />(psi) <br />2/4/15 Pore <br />Pressure <br />(psi) <br />3111115 Pore <br />Pressure <br />(psi) <br />Difference Since <br />Installation <br />(psi) <br />Difference Since <br />Last Reading <br />(psi) <br />VWP -A Deep <br />10.4 <br />7.7 <br />6.5 <br />-3.9 <br />-1.2 <br />VWP -A Shallow <br />4.7 <br />3.8 <br />4.1 <br />-0.6 <br />+03 <br />VWP -B Deep <br />0.2 <br />-0.1 <br />-0.1 <br />-0.3 <br />0.0 <br />VWP -B Shallow <br />13.9 <br />13.7 <br />13.2 <br />-0.7 <br />+0.5 <br />VWP -D <br />7.1 <br />8.0 <br />7.7 <br />+0.6 <br />-0.3 <br />