2017-07-20_REPORT - C1996083 (2)

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970-249-6828 ■ 800-860-9847 (fax) ■ 222 South Park ■ Montrose, Colorado 81401 ■ WM doW.00rn O`A, L Alaska ■ Arizona ■ Colorado ■ Montana ■ North Dakota ■ Oregon ■ Washington ■ Wyoming July 18, 2017 Mike Berry Huddleston -Berry Engineering and Testing, LLC 640 White Avenue Grand Junction, CO 81501 SUBJECT: Summary Report, First Quarter 2017, Vibrating Wire Piezometers through March 2017, Bowie Mine #2, Coal Waste Disposal Area (CWDA) #3 Dear Mr. Berry, DOWL conducted quarterly monitoring of installed vibrating wire piezometers at Coal Waste Disposal Area #3 (CWDA #3), Bowie Resources, LLC. This report is intended to cover the time period of April through June 2017. VWP data was recorded on 6/26/17. Per CDRMS and your instructions, vibrating wire piezometer readings for all active piezometers are taken quarterly. A graph of measured pore pressures is presented on the attached Figure 1 and numerically in Table 1 below. Table 1 summarizes the initial, prior and current readings and the difference in individual pore pressures since installation and previous quarterly readings. Table 1. Summary of Pore Pressure Readings Bowie CWDA #3 Q2 2017 VWP Report.docx Project #7131.74699.01 Page 1 of 2 Initial 3/10/17 6/26/17 Difference Difference Pore Pore Pore Since Since Last VWP ID # Pressure Pressure Pressure Installation Quarter 10/31/14 (psi) (psi) (psi) (psi) (psi) VWP-A Deep 10.4 5.0 4.4 -4.0 -0.6 VWP-A Shallow 4.7 4.1 3.9 -0.8 -0.2 VWP-13 Deep 0.2 0.0 0.3 +0.1 +0.3 VWP-13 Shallow 13.9 12.0 12.1 -1.8 +0.1 VWP-D 7.1 5.5 5.3 -1.8 -0.2 Bowie CWDA #3 Q2 2017 VWP Report.docx Project #7131.74699.01 Page 1 of 2