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Colowyo Coal Company Stockpond Inspections <br />5731 State Highway 13 <br />Meeker, CO 81641 <br />First Quarter 2016 <br />Notes: <br />- Impoundment volumes(d) are estimated from pre-existing as -built surveys, and estimates of accumulated <br />sediment. <br />I am a Licensed Professional Engineer in the State of Colorado The information contained in this document <br />was provided by Colowyo Coal L.P. Being familiar with the Colowyo operation, and relying on the information <br />provided to me by Colowyo Personnel, the information contained herein is reasonable and correct to the best <br />of my knowledge and experience. <br />E Pit Stockpond Insp-1 st_Qtr_2016.xis <br />PD1 <br />PD2 <br />NTEP1 <br />EPI <br />EP2 <br />ETI <br />ET2 <br />ETD1 <br />Inspection Date: <br />3128/2016 <br />3/28/2016 <br />3/28/2016 <br />3/28/2016 <br />3/28/2016 <br />3/28/2016 <br />3/28/2016 <br />3/28/2016 <br />Inspector: <br />Kurt Blunt <br />Kurt Blunt <br />Kurt Blunt <br />Kurt Blunt <br />Kurt Blunt <br />Kurt Blunt <br />Kurt Blunt <br />Kurt Blunt <br />Steve Weist <br />Steve Weist <br />Steve Waist <br />Steve Waist <br />Steve Waist <br />Steve Weist <br />Steve Weist <br />Steve Weist <br />Rule 4.05.9 (151 <br />(a) <br />Does pond exhibit <br />None <br />None <br />None <br />None <br />None <br />None <br />None <br />None <br />structural weakness, <br />erosion, or other <br />hazardous conditions? <br />I b I <br />Quarterly/ <br />Quarterly/ <br />Quarterly/ <br />Quarterly/ <br />Quarterly/ <br />Quarterly/ <br />Quarterly/ <br />Quarterly/ <br />Monitoring Procedures <br />Annual <br />Annual <br />Annual <br />Annual <br />Annual <br />Annual <br />Annual <br />Annual <br />and Instrumentation <br />Inspections <br />Inspections <br />Inspections <br />Inspections <br />Inspections <br />Inspections <br />Inspections <br />Inspections <br />C) <br />Elevation A As -built <br />7355.0 <br />7559.5 <br />7382.0 <br />7374.8 <br />7494.0 <br />7284.0 <br />74490 <br />7284.0 <br />Depth Water Level <br />(d) <br />Existing Storage <br />1.08 ac -ft. <br />1.49 ac -ft. <br />2.02 ac -ft. <br />1.25 ac -ft. <br />2.39 ac -ft. <br />0.737 ac -ft <br />2.33 ac -ft <br />0.915 ac -ft <br />Capacity <br />L1 <br />Design storage below <br />1.10 ac -ft. <br />1.49 ac -ft. <br />2.03 ac -ft. <br />1.29 ac -ft. <br />2.43 ac -ft <br />0.737 ac -ft <br />2.33 ac -ft <br />0.915 ac -ft <br />weep holes/primary <br />discharge (ac -ft.) <br />Lf1 <br />Pumping <br />None <br />None <br />None <br />Pumping <br />None <br />None <br />None <br />Maintenance Items <br />Notes: <br />- Impoundment volumes(d) are estimated from pre-existing as -built surveys, and estimates of accumulated <br />sediment. <br />I am a Licensed Professional Engineer in the State of Colorado The information contained in this document <br />was provided by Colowyo Coal L.P. Being familiar with the Colowyo operation, and relying on the information <br />provided to me by Colowyo Personnel, the information contained herein is reasonable and correct to the best <br />of my knowledge and experience. <br />E Pit Stockpond Insp-1 st_Qtr_2016.xis <br />