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GIN EE- <br />i Huddlestan -Berry <br />1 �1Y tingineering & "Testing, LLC <br />Bowie Resources, LLC <br />43659 Bowie Road <br />Paonia, Colorado 81428 <br />Attention: Mr. Bill Bear <br />Subject: October 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 -6868 <br />HuddlestoaiBerry C� hi•esnan,n4t <br />www.HBET -W.com <br />November 14, 2014 <br />Project #01349 -0001 <br />Reference: Stability, Ewthiation, Technical Revi.ssion 985, Gob Pile #2 Dlyying Area, Borl'ie <br />No. 2 Iline by I-Iuddleston -Berry Engineering & Testing;, LLC for Bowie <br />Resources, LLC, Tune 3, 2014. <br />Dear MT. Bear, <br />At the request of the Colorado Division of Reclamation, Mining and Safety (DBMS), <br />Huddleston -Berry Engineering & Testing, LLC (HBET) prepared this Ietter regarding monthly <br />monitoring; of vibrating wire piezomcters 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 />Monitoriit� <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. However, only VWP -06 and VWP - <br />09 are required to be monitored on a monthly basis. <br />Monitoring; of VWP -06 and VWP -08 was completed by Buckhorn Geotech, Inc. (BGI) on <br />October 3151, 2014. The monitoring report prepared by BGI is attached and the data is <br />summarized in the following table. <br />VWP ID <br />Initial Pore <br />9/24/14 Pore <br />10/31/14 Pore <br />Difference Since <br />Difference Since <br />Pressure <br />Pressure <br />Pressure <br />Installation <br />Last Reading <br />(psi) <br />(psi.) <br />-(Psi) <br />(psi) <br />{ si <br />VWP -06 <br />11.3 <br />17. <br />17.0 <br />+53 <br />-0.1 <br />VWP -08 <br />8.2 <br />9.7 <br />9.7 <br />+1.5 <br />0.0 <br />