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Colowyo Coal Company L.P. Permit No. C-1981-019 Quarterly Impoundment Inspections Third Quarter 2017 * Moment in time measurement of the elevation of the top of the captured pool of water within the pond. **Impoundments volumes are estimated from pre-existing as -built surveys and estimates of accumlated sediment. I am a Licensed Professional Engineer in the State of Colorado. The information contained in this document was provided by Colowyo Coal L.P. Being familiar with the Colowyo operation, and relying on the information provided to me by Colowyo Personnel, the information contained herein is reasonable and correct to the best of my knowledge and experience. Inspection Date: 9/26/2017 9/26/2017 9/26/2017 9/26/2017 9/26/2017 9/26/2017 9/26/2017 Inspector: Lee Sampson Lee Sampson Lee Sampson Lee Sampson Lee Sampson Lee Sampson Lee Sampson Rule 4.05.9 (15)(a) Does the pond exhibit erosion, Pond Not Pond Not Pond Not Pond Not Pond Not instability, structural No No Constructed Constructed Constructed Constructed Constructed weakness, or other hazardous conditions? Rule 4.05.9(15)(b) Existing and required Quarterly Inspection Quarterly Inspection Not Applicable Not Applicable Not Applicable Not Applicable Not Applicable monitoring procedures. Rule 4.05.9(15)(b) Not Applicable - Not Applicable - Required Instrumentation Nondischarging Nondischarging Not Applicable Not Applicable Not Applicable Not Applicable Not Applicable Structure Structure Rule 4.05.9(15)(c) Depth of Impounded Water 0 6.0 Not Applicable Not Applicable Not Applicable Not Applicable Not Applicable ft* Rule 4.05.9(15)(c) Elevation Dry 6413.0 Not Applicable Not Applicable Not Applicable Not Applicable pp Not Applicable pp of Impounded Water (ft)* Rule 4.05.9(15)(d) Existing Storage Capacity (ac- 0.38 3.27 Not Applicable Not Applicable Not Applicable Not Applicable Not Applicable ft)** Rule 4.05.9(15)(e) Any additional items effecting None None Not Applicable Not Applicable Not Applicable Not Applicable Not Applicable stability or maintenance items * Moment in time measurement of the elevation of the top of the captured pool of water within the pond. **Impoundments volumes are estimated from pre-existing as -built surveys and estimates of accumlated sediment. I am a Licensed Professional Engineer in the State of Colorado. The information contained in this document was provided by Colowyo Coal L.P. Being familiar with the Colowyo operation, and relying on the information provided to me by Colowyo Personnel, the information contained herein is reasonable and correct to the best of my knowledge and experience.