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U• GEOTECH I <br />October 13, 2014 (Revised 10- 20 -14) <br />H udd leston- 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: 3nd Quarter Summary of Inclinometer and Vibrating Wire <br />Piezometer Data September 2014, Bowie Mine No. 2, Coal Waste <br />Disposal Area No. 2 <br />Dear Mr. Berry, <br />Buckhorn Geotech, Inc. (BGI) conducted quarterly monitoring of inclinometers and <br />vibrating wire piezometers on September 24, 2014 at Coal Waste Disposal Area No. 2 <br />(CWDA No. 2) for Bowie Resources, LLC (Bowie). This report covers the time period of <br />July through September 2014. Per DRMS and your instructions last month, vibrating wire <br />piezometer readings are now only requested for VWP -06 and VWP -08 monthly and for all <br />active piezometers quarterly. <br />Vibratina Wire Line Piezometers <br />Table 1. Summary of VWP Pore Pressures <br />VWP ID # <br />Initial Pore <br />Pressure <br />(psi) <br />8/22/14 Pore <br />Pressure <br />(psi) <br />9/24/14 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 />1.9* <br />2.5 <br />-4.3 <br />+0.6 <br />VWP -06 <br />11.3 <br />17.4 <br />17.1 <br />+5.8 <br />-0.3 <br />VWP -08 <br />1 8.2 <br />1 9.6 <br />1 9.7 <br />+1.5 <br />1 +0.1 <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 />*Q2 reading (June 29, 2014) <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 />September 2014 Q3 Instrumentation Report REVISED 10 -20 -14 PN #13 -231 -001 <br />Page 1 of 2 <br />