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970-249-6828 800-865-9847(fax) 222 South Park Montrose,Colorado 81401 www.dowl.com <br /> ID13WL <br /> HiaSKa ■ Arizona ■ uoioraao ■ iviontana ■ vi 4vasningion ■ vvyoming <br /> October 4, 2019 <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 2019, Inclinometer and Active Vibrating <br /> Wire Piezometer Data July— September 2019, Bowie Mine #2 <br /> Coal Waste 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 period of July through September 2019. VWP and inclinometer data was recorded on <br /> 9/30/19. Per CDRMS and your instructions, vibrating wire piezometer and inclinometer readings <br /> for all active instruments are taken quarterly. <br /> Vibrating Wire Piezometers <br /> The physical locations of the piezometers are shown on the attached Instrumentation Site Plan <br /> (Map 1). As seen on 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 adjacent to the three <br /> inclinometers. The graph of historical data from 5/16/05 through 5/21/14 is presented for <br /> reference as Figure 1. A graph of measured pore pressures of active piezometers is presented <br /> on the attached Figure 2 and is presented numerically in Table 1 below. <br /> Table 1. Summary of VWP Pore Pressure Readings <br /> Installation 6/14/19 9/30/19 Difference Difference <br /> VWP ID # Pore (Q2) Pore (Q3) Pore Since Since Last <br /> Pressure Pressure Pressure Installation Quarter <br /> (psi) (psi) (psi) (psi) (psi) <br /> VWP-05 6.8 1.5 1.9 -4.9 0.4 <br /> VWP-06 11.3 12.2 12.0 0.7 -0.2 <br /> VWP-08 8.2 8.9 8.8 0.6 -0.1 <br /> VWP-09 2.8 2.8 2.8 0.0 0.0 <br /> VWP-10 -1.9 -1.8 -1.8 0.1 0.0 <br /> Bowie CWDA#2 Q3 2019 VWP-Inclinometer report.docx <br /> Project#7131.74699.03 <br /> Page 1 of 2 <br />