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Stability Analysis <br />See various Buckhorn Geotech's Stability Evaluation of Proposed Coal Waste <br />Pile No. 3, following this section. <br />Buckhorn Geotech's report dated October 26, 2006 provided a preliminary <br />stability analysis for gob pile #3 based on geotechnical investigation performed <br />by Lambert in 2001 and recent field and laboratory experience at gob pile #2. <br />This report concluded the gob pile will be stable at a maximum height of 90' with <br />3HA V side slopes. <br />Buckhorn Geotech's report dated March 29, 2007 revised the previously <br />submitted stability analysis with site specific conditions based on in -depth field <br />testing. This report evaluated numerous gob pile configurations and found <br />various configurations to be considered stable. Please see the report following <br />this section for configuration specifics. The maximum pile height of 115' with <br />3H:1 V side slopes would be considered stable. <br />Buckhorn Geotech's report dated October 15, 2013 revised the previously <br />submitted stability analysis to steepen the slope angle from 3H:1 V to 2.5H:1 V. <br />The maximum pile height of 110' with 2.5H:1 V side slopes is considered stable. <br />The Operator commits to having a qualified third party geotechnical firm perform <br />monitoring and testing. Monitoring will consist of observations of the <br />geotechnical aspects of the construction to determine if any unusual or <br />unexpected conditions are encountered. Testing will include compaction tests <br />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 />Volume XI <br />TR -84 - 11 - 12/13 <br />