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970-249-6828 ■ 800-865-9847 (fax) ■ 222 South Park ■ Montrose, Colorado 81401 ■ www.dowl.com <br />Alaska ■ Arizona ■ Colorado ■ Montana ■ North Dakota ■ Oregon ■ Washington ■ Wyoming <br />Bowie CWDA #3 Q4 2017 VWP Report.docxBowie CWDA #3 Q4 2017 VWP Report.docx <br />Project #7131.74699.01 <br />Page 1 of 2 <br />December 22, 2017 <br /> <br />Mike Berry <br />Huddleston-Berry Engineering and Testing, LLC <br />640 White Avenue <br />Grand Junction, CO 81501 <br /> <br /> <br />SUBJECT: Summary Report, 4th Quarter 2017, Vibrating Wire Piezometers <br />through December 2017, Bowie Mine #2, Coal Waste Disposal Area <br />(CWDA) #3 <br /> <br /> <br />Dear Mr. Berry, <br /> <br />DOWL conducted quarterly monitoring of installed vibrating wire piezometers at Coal Waste <br />Disposal Area #3 (CWDA #3), Bowie Resources, LLC. This report is intended to cover the time <br />period of October through December 2017. VWP data was recorded on 12/20/17. Per CDRMS <br />and your instructions, vibrating wire piezometer readings for all active piezometers are taken <br />quarterly. <br /> <br />A graph of measured pore pressures is presented on the attached Figure 1 and numerically in <br />Table 1 below. Table 1 summarizes the initial, prior and current readings and the difference in <br />individual pore pressures since installation and previous quarterly readings. <br /> <br /> <br />Table 1. Summary of Pore Pressure Readings <br />VWP ID # <br />Initial <br />Pore <br />Pressure <br />10/31/14 <br />(psi) <br />9/20/17 <br />Pore <br />Pressure <br />(psi) <br />12/20/17 <br />Pore <br />Pressure <br />(psi) <br />Difference <br />Since <br />Installation <br />(psi) <br />Difference <br />Since Last <br />Quarter <br />(psi) <br />VWP-A Deep 10.4 4.3 3.9 -6.5 -0.4 <br />VWP-A Shallow 4.7 3.9 3.8 -0.9 -0.1 <br />VWP-B Deep 0.2 0.3 0.1 -0.1 -0.2 <br />VWP-B Shallow 13.9 12.0 11.8 -2.1 -0.2 <br />VWP-D 7.1 7.0 6.3 -0.8 -0.7 <br /> <br />