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Colowyo Coal Company L.P. <br />Permit No. C-1981-019 <br />Quarterly Impoundment Inspections <br />Second 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 document was provided by Colowyo Coal L.P. Being familiar with the <br />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 <br />knowledge and experience. <br />- 47031 <br />Streeter Pond <br />Work Area Pond <br />Gossard Pond <br />Gulch A Pond <br />Stoker Siding Pond <br />Rail Loop Pond <br />Prospect Pond <br />West Pit Pond <br />Section 16 Pond <br />East Taylor Pond <br />West Taylor Pond <br />Section 28 Pond <br />Inspection Date: <br />6/21/2018 <br />6/13/2018 <br />6/21/2018 <br />6/21/2018 <br />6/21/2018 <br />6/21/2018 <br />6/21/2018 <br />6/13/2018 <br />6/13/2018 <br />6/13/2018 <br />6/13/2018 <br />6/21/2018 <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 />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, structural <br />No <br />No <br />No <br />No <br />No <br />No <br />No <br />No <br />No <br />No <br />No <br />No <br />weakness, or other hazardous <br />conditions? <br />Rule 4.05.9(15)(b) <br />Existing and required <br />Quarterly Inspection <br />Quarterly Inspection <br />Quarterly Inspection <br />Quarterly Inspection <br />Quarterly Inspection <br />Quarterly Inspection <br />Quarterly Inspection <br />Quarterly Inspection <br />Quarterly Inspection <br />Quarterly Inspection <br />Quarterly Inspection <br />Quarterly Inspection <br />monitoring procedures. <br />Parshall Flume In <br />Parshall Flume In <br />Parshall Flume In <br />Parshall Flume In <br />Parshall Flume In <br />Parshall Flume In <br />Parshall Flume In <br />Parshall Flume In <br />Parshall Flume In <br />Parshall Flume In <br />Parshall Flume In <br />Parshall Flume In <br />Rule 4.05.9(15)(b) <br />Place and <br />Place and <br />Place and <br />Place and <br />Place and <br />Place and <br />Place and <br />Place and <br />Place and <br />Place and <br />Place and <br />Place and <br />Required Instrumentation <br />Functioning <br />Functioning <br />Functioning <br />Functioning <br />Functioning <br />FunctioningFunctioning <br />Functioning <br />Functioning <br />Functioning <br />Functioning <br />Functionin <br />Rule 4.05.9(15)(c) <br />Depth of Impounded Water <br />5.0 <br />7.0 <br />4.3 <br />Dry <br />3.0 <br />5.5 <br />8.0 <br />Dry <br />4.0 <br />22.0 <br />13.0 <br />Dry <br />(ft)* <br />Rule 4.05.9(15)(c) <br />Elevation of Impounded <br />6583.0 <br />7153.0 <br />6388.3 <br />Dry <br />6325.0 <br />6349.5 <br />6742.0 <br />Dry <br />7744.0 <br />6952.0 <br />7468.0 <br />Dry <br />Water (ft)* <br />Rule 4.05.9(15)(d) Existing <br />3.11 <br />9.71 <br />2.29 <br />3.70 <br />0.35 <br />1.01 <br />1.34 <br />4.35 <br />0.57 <br />1.75 <br />1.40 <br />1.67 <br />Storage Capacity (ac -ft)** <br />Rule 4.05.9(15)(e) <br />Any additional items effecting <br />None <br />None <br />None <br />None <br />None <br />None <br />None <br />None <br />None <br />None <br />None <br />None <br />stability or maintenance <br />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 document was provided by Colowyo Coal L.P. Being familiar with the <br />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 <br />knowledge and experience. <br />- 47031 <br />