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14EEq�� <br />r( I Huddleston -Berry <br />c� <br />Engineering & Testing, LLC <br />Bowie Resources, LLC <br />43659 Bowie Road <br />Paonia, Colorado 81428 <br />Attention: Mr. Bill Bear <br />Subject: July 2014 Vibrating, Wire Piezorneter Monitoring <br />Bowie Coal Waste Disposal Area No. 2 <br />Paonia, Colorado <br />640 White Avenue <br />Grand Junction, CO 81501 <br />Phone; 970- 255 -8005 <br />Fax: 970-255-6818 <br />HuddlestojiBerry(q� bresiran. net <br />www.14BFT- GJ.com <br />August 12, 2014 <br />Project #01349 -0001 <br />Reference: SIabilily E cilualion, Technical Revision #85, Gob Pile #2 Drying Area, Bowie <br />No. 2 -Hine 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 />fiinction. Currently, five of the piezometers are functional. <br />Monitoring of the functioning piezometers was completed by Buckhorn Geotech, Inc. (BGl) on <br />July 25"', 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 />6129/14 Pore <br />Pressure <br />(psi) <br />7/25/14 Pore <br />Pressure <br />(psi) <br />Difference Since <br />Installation <br />(psi) <br />Difference ShIce <br />Last Reading <br />(psi) <br />VWP -05 <br />6.8 <br />2.0 <br />2.1 <br />-4.7 <br />+0. t <br />VWP -06 <br />11.3 <br />16.0 <br />16.8 <br />+5.5 <br />+0.8 <br />VWP -08 <br />8.2 <br />9.2 <br />9.4 <br />+1.2 <br />+0.2 <br />VWP -09 <br />2.8 <br />2.8 <br />2.9 <br />+0.1 <br />+0.1 <br />VWP -10 <br />-1.9 <br />-1.9 <br />-1.8 <br />+0.1 <br />+0.1 <br />