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U• GEOTECH I <br />January 13, 2015 (rev 1- 14 -15) <br />Huddleston -Berry Engineering and Testing, LLC <br />640 White Avenue <br />Grand Junction, CO 81501 <br />Attention: Mike Berry, PE <br />Civil, Structural +& Geotechnical Engineers <br />222 South Park Ave, • Montrose, CO 81401 <br />Fah.. (970) 2496828 -FAX (970) 249 -0945 <br />SUBJECT: 41th Quarter Summary of Inclinometer and Vibrating Wire <br />Piezometer Data thru December 2014, Bowie Mine No. 2, Coal <br />Waste Disposal Area No. 2 <br />Dear Mr. Berry, <br />Buckhorn Geotech, Inc. (BGI) conducted quarterly monitoring of inclinometers and <br />vibrating wire piezometers in December 2014 into January 2015 at Coal Waste Disposal <br />Area No. 2 (CWDA No. 2) for Bowie Resources, LLC (Bowie). This report is intended to <br />cover the time period of October through December 2014. Some readings were taken in <br />January 2015 due to access and equipment issues. Per DRMS and your instructions, <br />vibrating wire piezometer readings for all active piezometers are taken quarterly along <br />with inclinometers. <br />Vibratina Wire Line Piezometers <br />Table 1. Summary of VWP Pore Pressures <br />VWP ID # <br />Initial Pore <br />Pressure <br />(psi) <br />9/24/14 Pore <br />Pressure <br />(psi) <br />1/6/15 Pore <br />Pressure <br />(psi) <br />Difference <br />Since <br />Installation <br />(Psi) <br />Difference <br />Since Last <br />Reading <br />(Psi) <br />VWP -05 <br />6.8 <br />2.5 <br />2.3 <br />-4.5 <br />-0.2 <br />VWP -06 <br />11.3 <br />17.1 <br />16.8 <br />+5.5 <br />-0.3 <br />VWP -08 <br />1 8.2 <br />1 9.7 <br />1 9.8 <br />+1.6 <br />1 +0.1 <br />VWP -09 <br />2.8 <br />2.9 <br />3.0 <br />+0.2 <br />+0.1 <br />VWP -10 <br />-1.9 <br />-1.8 <br />-1.7 <br />+0.2 <br />+0.1 <br />The physical locations of the piezometers are shown on the attached Instrumentation <br />Site Plan, Drawing 1. The graph of historical data through 5 -21 -14 is presented for <br />reference as Figure 1. A graph of active piezometers only is presented as Figure 2. <br />Inclinometers <br />Three inclinometers, designated BG05 -04, BG05 -05, and BG05 -07, were installed at <br />CWDA No. 2 in August 2005. The inclinometers were installed through the coal refuse <br />and approximately 20 feet into the native foundation soils. The physical locations of the <br />December 2014 Q4 Instrumentation Report 1 -13 -15 PN #13- 231 -001 <br />Page 1 of 2 <br />