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970-249-6828 ■ 800-860-9847 (fax) ■ 222 South Park ■ Montrose, Colorado 81401 ■ WM clowl.corn <br />O`A, L Alaska ■ Arizona ■ Colorado ■ Montana ■ North Dakota ■ Oregon ■ Washington ■ Wyoming <br />September 26, 2017 <br />Mike Berry <br />Huddleston -Berry Engineering and Testing, LLC <br />640 White Avenue <br />Grand Junction, CO 81501 <br />SUBJECT: Summary Report, 3rd Quarter 2017, Inclinometer and Active Vibrating <br />Wire Piezometer Data July — Sept 2017, Bowie Mine #2, Coal Waste <br />Disposal Area (CWDA) #2 <br />Dear Mr. Berry: <br />DOWL conducted quarterly monitoring of inclinometers and vibrating wire piezometers (VWP) at <br />Coal Waste Disposal Area #2 (CWDA #2), Bowie Resources, LLC. This report is intended to <br />cover the time period of July through September 2017. VWP and inclinometer data was <br />recorded on 9/20/17. Per CDRMS and your instructions, vibrating wire piezometer readings for <br />all active piezometers are taken quarterly along with inclinometers. <br />Vibrating Wire Piezometers <br />The physical locations of the piezometers are shown on the attached Instrumentation Site Plan <br />(Map 1). As seen from this map, five of the original VWP's were damaged and some were <br />replaced. Currently, there are five active VWP's and three of them are associated with the three <br />inclinometers on this CDWA. The graph of historical data from 5/16/05 through 5/21/14 is <br />presented for reference as Figure 1. A graph of measured pore pressures of only active <br />piezometers is presented on the attached Figure 2 and is presented numerically in Table 1 <br />below. <br />Table 1. Summary of VWP Pore Pressure Readings <br />Bowie CWDA #2 Q3 2017 VWP & Inclinometer report.docx <br />Project #7131.74699.01 <br />Page 1 of 2 <br />Initial <br />6/26/17 <br />9/20/17 <br />Difference <br />Difference <br />Pore <br />Pore <br />Pore <br />Since <br />Since Last <br />VWP ID # <br />Pressure <br />Pressure <br />Pressure <br />Installation <br />Quarter <br />(Psi) <br />(Psi) <br />(Psi) <br />(psi) <br />(Psi) <br />VWP-05 <br />6.8 <br />1.9 <br />2.2 <br />-4.6 <br />+0.3 <br />VWP-06 <br />11.3 <br />13.3 <br />13.2 <br />+1.9 <br />-0.1 <br />VWP-08 <br />8.2 <br />9.7 <br />9.6 <br />+1.4 <br />-0.1 <br />VWP-09 <br />2.8 <br />2.9 <br />2.8 <br />0.0 <br />-0.1 <br />VWP-10 <br />-1.9 <br />-1.7 <br />-1.8 <br />+0.1 <br />-0.1 <br />Bowie CWDA #2 Q3 2017 VWP & Inclinometer report.docx <br />Project #7131.74699.01 <br />Page 1 of 2 <br />