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Slope Stability Analysis <br />A slope stability analysis of the proposed West Waste Bank was performed using GALENA — <br />Slope Stability Analysis System (Galena). Material properties and parameters used in the stability <br />analysis were taken from laboratory results from on-site samples as reported in Trauatner's Report. <br />The profile was mapped in Galena using the proposed Map King I -016A profile "A". For a <br />conservative approach, groundwater was included in the analysis at a level which is highly unlikely. <br />As noted in the Report, "Based on information obtained from our test boring advanced for this <br />project as well as several previous studies near the NKC 1 portal we do not feel that shallow <br />subsurface water exists at the proposed West Bank mine waste deposit site." Results of the Galena <br />stability analysis was a factor of safety of 1.83 (attached) which exceeds the minimum requirements <br />of Rule 4.09.2(2). Factor of safety results from Trautner's Report ranged from 1.87 — 2.60. 1 have no <br />comments regarding the geotechnical design of the proposed West Waste Bank. <br />This concludes my review of King Coal Mine's TR -20. If you have questions or need additional <br />information, please contact me. <br />Sincerely, <br />Zach T. Trujillo <br />Environmental Protection Specialist <br />C -MR -13 <br />