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z EIYginrcring E4=_ Testing, LEE <br />Bowie Resources, LLC <br />43659 Bowie Road <br />Paonia, Colorado 81428 <br />Attention: Mr. Bill Dear <br />640 White AvcilLJC <br />Gnmid.function, CO 81501 <br />Phone; 970 -255 -8005 <br />Fax: 970-255-6818 <br />1'11.1dd 10s'( (jiff c1.)'y 1 rc, "U bt[l.I W'r <br />tvwvv,f- BET -GJx( in <br />May 7, 2014 <br />Project 401 349 -0001 <br />Subject: Vibrating Wire Piezonieter Monitoring <br />Bowie Coal Waste Disposal Area No. 2 <br />Paonia, Colorado <br />Reference: Stability Evaluation, Technical Revision #85, Gob Pile #2 Dying Area, Boivie <br />No, 2 Uine by I-Iudd test on-Berry Engineering & Testing, LLC for Bowie <br />Resources, LLC, April 4, 2014, <br />Dear Mr, Bear, <br />At the request of the Colorado Division of Reclamation, Mining; and Safety (DBMS), <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 Bucichorn Geotech, Inc. (BGI) on <br />April 21 ", 2014. The monitoring report prepared by BGI is attached and the data is summarized <br />in the following table, <br />VWP ID <br />Initial Pore <br />Pressure <br />--(Psi) <br />3/17/14 Pore <br />Pressure <br />(psi) <br />4 /21t14.Pore <br />Pressure <br />1si) <br />Difference Since <br />installation <br />Difference Since <br />Last Reading <br />(isi) <br />VWP -05 <br />6,8 <br />2.0 <br />1,9 <br />-4.9 <br />-0.1 <br />VWP -06 <br />11.3 <br />.14.8 <br />14.6 <br />-4 -3.3 <br />-0.2 <br />VWP -08 <br />12.2 <br />116 <br />12,6 <br />+0.4 <br />OA <br />VWP -09 <br />1.S <br />1.4 <br />1.6 <br />+0.1 <br />+0.2 <br />VWP -10 <br />0.6 <br />0.5 <br />0.7 <br />+0.1 <br />+0.2 <br />