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! � E�h <br />4 <br />Huddleston -Berry <br />y /JCx Fngincering & Tcsfing, LLC <br />Bowie Resources, LLC <br />43659 Bowie Road <br />Paonia, Colorado 81428 <br />Attention: Mr. Bill Bear <br />Subject: August 2014 Vibrating Wire Piezometer 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 />HuddlestoiiBefTy C� bresnan. net <br />www.HBFT GJ.com <br />September 2, 2014 <br />Project #01349 -0001 <br />Reference: Stability Ewilualion, Technicril Revision #RS, Gob Pile 42 Dij,h7g Area, Boit,ie <br />No. 2 Ifine by Huddle ston -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 (DBMS), <br />Huddleston -Berry Engineering & Testing, LLC (I-IBET) 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. However, only VWP -06 and VWP - <br />08 are required to be monitored on a monthly basis. <br />Monitoring of VWP -06 and VWP -08 was completed by Buckhorn Geotcch, Inc. (BGI) on <br />August 22" d, 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 />7/25/14 Pore <br />8/22/14 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 />(psi) <br />VWP -06 <br />11.3 <br />16.8 <br />17.4 <br />+6.1 <br />+0.6 <br />VWP -08 <br />8.2 <br />9.4 <br />9.6 <br />+1.4 <br />+0.2 <br />