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• and periodic strength tests. Results of the tests and any observed unusual or <br />unexpected conditions will be submitted to the DRMS with the quarterly <br />inspection reports. <br />The quarterly reports will also include a summary of instrumentation monitoring <br />on coal mine waste pile number 2. This report will include a discussion of the <br />inclinometer data and the vibrating wire piezometer data. The inclinometer data <br />will determine if there are indications of deep-seated instability. The vibrating <br />wire piezometer data will determine if the measured pore pressures are relatively <br />stable and consistent with the September 22, 2008 stability analysis performed <br />by Buckhorn Geotech, Inc. <br />The Operator commits to having a geotechnical engineering firm continue <br />instrumentation monitoring, at a minimum, once per quarter. Additional <br />inclinometers and vibrating wire piezometers may be installed at the discretion of <br />the geotechnical engineering firm. <br />In addition to the five piezometers (only three are still in working order) installed <br />• in June of 2005, three additional piezometers were installed during the week of <br />June 7t' 2009. The location of the six working piezometers that will be <br />monitored are shown on Figure 1. <br />0 <br />TR-61 -14- 06/09 <br />6114101