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w�14m,970 249-6828 waw 800..865. 9847 (frM) a 222 SmAh R' is k e Wlonfs arse, CC, 8 401 �n���tir: akG��d a;vivr <br />f,nfa m Atkzon�' ,, m ,.,Ickra n oumIOx[` 2 0 No'f°m iI,;CEtG,tlr <br />CMO W L <br />January 8, 2016 (revised 1-11-16) <br />Huddleston -Berry Engineering and Testing, LLC <br />640 White Avenue <br />Grand Junction, CO 81501 <br />Attention: Mike Berry, PE <br />SUBJECT: Fourth Quarter 2015 Summary of Inclinometer and Active Vibrating <br />Wire Piezometer Data through December 2015, Bowie Mine No. 2, Coal <br />Waste Disposal Area No. 2 <br />Dear Mr. Berry, <br />DOWL has conducted quarterly monitoring of inclinometers and vibrating wire piezometers at <br />Coal Waste Disposal Area No. 2 (CWDA No. 2) for Bowie Resources, LLC (Bowie). This report is <br />intended to cover the time period of September through December 2015. VWP data was <br />obtained on 12-19-15 and 1-8-16 and inclinometer data was obtained on 12-19-15. Per DRMS <br />and your instructions, vibrating wire piezometer readings for all active piezometers are taken <br />quarterly along with inclinometers. <br />Vibrating Wire Line Piezometers <br />Table 1. Summary of VWP Pore Pressures <br />VWP ID <br /># <br />Initial Pore <br />Pressure <br />(psi) <br />9/26/15 Pore <br />Pressure <br />(psi) <br />12/19/15 <br />Pore 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 />2.2 <br />1.9* <br />-4.9 <br />-0.3 <br />VWP-06 <br />11.3 <br />15.4 <br />15.0 <br />+3.7 <br />-0.4 <br />VWP-08 <br />8.2 <br />9.9 <br />10.0 <br />+1.8 <br />+0.1 <br />VWP-09 <br />2.8 <br />2.9 <br />2.8 <br />0 <br />-0.1 <br />VWP-10 <br />-1.9 <br />-1.8 <br />-1.9 <br />0 <br />-0.1 <br />*Obtained on 1-8-16 <br />The physical locations of the piezometers are shown on the attached Instrumentation Site Plan, <br />Drawing 1. The graph of historical data through 5-21-14 is presented for reference as Figure 1. <br />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 CWDA No. <br />2 in August 2005. The inclinometers were installed through the coal refuse and approximately <br />20 feet into the native foundation soils. The physical locations of the inclinometers are shown <br />on the attached Instrumentation Site Plan, Drawing 1. Baseline readings were taken on <br />8/10/05 and subsequent readings have generally been taken quarterly since that time. <br />Displacement curves for the prior nine month period are presented as attachments to this letter <br />for each inclinometer. Axis "A" reflects deformation with depth in the direction of anticipated <br />Bowie CDWA 2 VWP and Inclinometer Q4 2015 report <br />Project #7131.74111.01 <br />Page 1 of 2 <br />