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Colowyo Coal Company L.P. <br />Permit No. C-1981-019 <br />Quarterly Impoundment 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 document was provided by Colowyo <br />Coal L.P. Being familiar with the Colowyo operation, and relying on the information provided to me by Colowyo Personnel, the <br />information contained herein is reasonable and correct to the best of my knowledge and experience. <br />- <br />- <br />47031 <br />Temporary <br />Wilson Storage <br />Section 36 Pond <br />Middle Pond <br />Section 25 Pond <br />Sidehill Pond <br />Section 26 Pond <br />Facilities Pond <br />Pond <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 />Inspector: <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 erosion, <br />Pond Not <br />Pond Not <br />Pond Not <br />Pond Not <br />Pond Not <br />instability, structural weakness, <br />No <br />No <br />Constructed <br />Constructed <br />Constructed <br />Constructed <br />Constructed <br />or other hazardous conditions? <br />Rule 4.05.9(15)(b) <br />Existing and required <br />Quarterly Inspection <br />Quarterly Inspection <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />monitoring procedures. <br />Rule 4.05.9(15)(b) <br />Not Applicable - <br />Not Applicable - <br />Required Instrumentation <br />Nondischarging <br />Nondischarging <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />Structure <br />Structure <br />Rule 4.05.9(15)(c) <br />Depth of Impounded Water <br />Mud <br />2.0 <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />(ft)* <br />Rule 4.05.9(15)(c) Elevation <br />of Impounded Water (ft)* <br />6396.0 <br />6409.0 <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />Rule 4.05.9(15)(d) <br />Existing Storage Capacity (ac- <br />0.38 <br />3.27 <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />ft)** <br />Rule 4.05.9(15)(e) <br />Any additional items effecting <br />None <br />None <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />Not Applicable <br />stability or 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 document was provided by Colowyo <br />Coal L.P. Being familiar with the Colowyo operation, and relying on the information provided to me by Colowyo Personnel, the <br />information contained herein is reasonable and correct to the best of my knowledge and experience. <br />- <br />- <br />47031 <br />