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Colowyo Coal Company L.P. <br />Permit No. C-1981-019 <br />Quarterly Stock Pond Inspections <br />First Quarter 2018 <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 — <br />document was provided by Colowyo Coal L.P. Being familiar with the Colowyo operation, and relying on <br />the information provided to me by Colowyo Personnel, the information contained herein is reasonable �''•�, ;�t`'� <br />and correct to the best of my knowledge and experience. ��'�''►��������''���� <br />PD1 <br />PD2 <br />NTEP1 <br />EPI <br />EP2 <br />ET1 <br />ET2 <br />ETD1 <br />Inspection Date: <br />3/27/2018 <br />3/27/2018 <br />3/27/2018 <br />3/27/2018 <br />3/27/2018 <br />3/27/2018 <br />3/27/2018 <br />3/27/2018 <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 />No <br />No <br />No <br />No <br />No <br />No <br />No <br />No <br />structural weakness, or <br />other hazardous <br />conditions? <br />Rule 4.05.9(15)(b) <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Quarterly <br />Existing and required <br />Quarterly Inspection <br />Inspection <br />Inspection <br />Inspection <br />Inspection <br />Inspection <br />Inspection <br />Inspection <br />monitoring procedures. <br />Rule 4.05.9(15)(b) <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 />Required Instrumentation <br />Rule 4.05.9(15)(c) <br />Depth of Impounded <br />8.0 <br />5.0 <br />4.0 <br />7.8 <br />11.0 <br />1.0 <br />11.0 <br />5.0 <br />Water (ft)* <br />Rule 4.05.9(15)(c) <br />Elevation of Impounded <br />7356.0 <br />7561.0 <br />7382.0 <br />7377.8 <br />7495.0 <br />7284.0 <br />7454.0 <br />7288.0 <br />Water (ft)* <br />Rule 4.05.9(15)(d) <br />Existing Storage Capacity <br />0.95 <br />1.49 <br />2.02 <br />1.23 <br />2.16 <br />0.72 <br />2.32 <br />0.91 <br />(ac -ft)** <br />Rule 4.05.9(15)(e) <br />Any additional items <br />None <br />None <br />None <br />Pumping <br />Pumping <br />None <br />Pumping <br />Pumping <br />effecting stability or <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 — <br />document was provided by Colowyo Coal L.P. Being familiar with the Colowyo operation, and relying on <br />the information provided to me by Colowyo Personnel, the information contained herein is reasonable �''•�, ;�t`'� <br />and correct to the best of my knowledge and experience. ��'�''►��������''���� <br />