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Colowyo Coal Company L.P. <br />Permit No. C-1981-019 <br />Quarterly Stock Pond Inspections <br />Third Quarter 2017 <br />* Moment in time measurement of the elevation of the top of the captured pool of water within the pond. <br />**Impoundments volumes are estimated from pre-existing as -built surveys and estimates of accumlated sediment. <br />I am a Licensed Professional Engineer in the State of Colorado. The information contained in this 47031— : E <br />document was provided by Colowyo Coal L.P. Being familiar with the Colowyo operation, and relying t' <br />on the information provided to me by Colowyo Personnel, the information contained herein is <br />reasonable and correct to the best of my knowledge and experience. <br />q-26-1-7 <br />Inspection Date: <br />9/26/2017 <br />9/26/2017 <br />9/26/2017 <br />9/26/2017 <br />9/26/2017 <br />9/26/2017 <br />9/26/2017 <br />9/26/2017 <br />Inspector: <br />Lee Sampson <br />Lee Sampson <br />Lee Sampson <br />Lee Sampson <br />Lee Sampson <br />Lee Sampson <br />Lee Sampson <br />Lee Sampson <br />Rule 4.05.9 (15)(a) <br />Does the pond exhibit <br />erosion, instability, <br />structural weakness, or <br />s <br />No <br />No <br />No <br />No <br />No <br />No <br />No <br />No <br />other hazardous <br />Rule 4.05.9(15)(b) <br />Existing and required <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly Inspection <br />monitoring rocedures. <br />Inspection <br />Inspection <br />Inspection <br />Inspection <br />Inspection <br />Inspection <br />Inspection <br />Rule 4.05.9(15)(b) <br />Required Instrumentation <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />Rule 4.05.9(15)(c) <br />Depth of Impounded <br />4.0 <br />4.0 <br />4.0 <br />0.0 <br />8.0 <br />1.0 <br />6.0 <br />1.0 <br />Water (ft)* <br />Rule 4.05.9(15)(c) <br />Elevation of Impounded <br />7352.0 <br />7560.0 <br />7382.0 <br />Mud <br />7492.0 <br />7284.0 <br />7449.0 <br />7284.0 <br />Water (ft)* <br />Rule 4.05.9(15)(d) <br />Existing Storage Capacity <br />0.97 <br />1.49 <br />2.02 <br />1.24 <br />2.18 <br />0.73 <br />2.32 <br />0.91 <br />ac -ft ** <br />Rule 4.05.9(15)(e) <br />Any additional items <br />effecting stability or <br />None <br />None <br />None <br />None <br />None <br />None <br />None <br />None <br />maintenance items <br />* Moment in time measurement of the elevation of the top of the captured pool of water within the pond. <br />**Impoundments volumes are estimated from pre-existing as -built surveys and estimates of accumlated sediment. <br />I am a Licensed Professional Engineer in the State of Colorado. The information contained in this 47031— : E <br />document was provided by Colowyo Coal L.P. Being familiar with the Colowyo operation, and relying t' <br />on the information provided to me by Colowyo Personnel, the information contained herein is <br />reasonable and correct to the best of my knowledge and experience. <br />q-26-1-7 <br />