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Bowie No. 2 Mine <br />TR-61 Adequacy Review <br />29 May 2009 <br />Page 2 of 4 <br />NC: Page 14 of the Volume IX text in the application states, in essence, that <br />quarterly inspection reports will provide a summary of instrumentation monitoring on <br />CMWDA2, including a discussion of the vibrating wire piezometer data. This data <br />will determine if the measured pore pressures are relatively stable, and consistent <br />with those incorporated into the TR-56 BGI report. The Operator commits to having <br />a geotechnical engineering firm continue instrumentation monitoring on a quarterly <br />basis. Installation of any additional vibrating wire piezometers is proposed to be at <br />the discretion of the geotechnical engineering firm. <br />While specific details of piezometer location and/or modification have not been <br />provided, the Operator has committed to the utilization of a geotechnical firm for <br />monitoring of the piezometers and for determining the necessity of additional <br />piezometers. In accordance with the recommendations of the BGI TR-56 report, <br />please revise the monitoring frequency to be a minimum of once per quarter. <br />Tn cl i nnm eters <br />OC: Three inclinometers were installed in August 2005, and have been periodically <br />monitored since that time. Data acquired from the instruments indicates no failure <br />planes have developed, nor does down-slope creep appear to be occurring within <br />CMWDA2 <br />Please describe the proposed on-going monitoring plan for use of inclinometers, <br />including the locations of any new inclinometers and the proposed monitoring <br />frequency. <br />NC: Page 14 of the Volume IX text in the application states, in essence, that <br />quarterly inspection reports will provide a summary of instrumentation monitoring on <br />CMWDA2, including a discussion of the inclinometer data. The Operator commits to <br />having a geotechnical engineering firm continue instrumentation monitoring on a <br />quarterly basis. Installation of any additional inclinometers is proposed to be at the <br />discretion of the geotechnical engineering firm. <br />While specific details of inclinometer location have not been provided, the Operator <br />has committed to the utilization of a geotechnical firm for monitoring of the <br />inclinometer and for determining the necessity of additional inclinometers. In <br />accordance with the recommendations of the BGI TR-56 report, please revise the <br />monitoring frequency to be a minimum of once per quarter. <br />Construction <br />OC: Section 6.0 of the BGI report includes specific recommendations regarding <br />placement of coal mine waste in the approved slope configuration of 3H:1 V.