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Using water quality data collected at the Canadian Strip Mine, it is not thought that the <br />spoil recharge will adversely effect the quality of either the coal, underburden or <br />overburden. Based upon total dissolved solids (TDS) concentrations measured at Well <br />No. 7, a spoils monitoring well completed in the north pit area, and compared to TDS <br />concentrations measured in underburden, coal and overburden wells, the spoil aquifer <br />quality is equal to or better than that of the other three units. Then, it is estimated that <br />the quantity of spoils water that will rechazge these units, due to the limited area of <br />impact, will be insignificant. <br />As spoil aquifer development is expected [o be limited, it is thought that the potential for <br />future surface discharges is slight. If surface discharge as springs or seeps do occur in <br />the future, the quantity of the discharge should be limited and the quality acceptable for <br />livestock use. If a discharge is to occur in the future, it will be into the drainage <br />established per the proposed reclamation plan. <br />B. Water Monitoring <br />The applicant will conduct monitoring of groundwater in a manner approved by the <br />Division (4.05.13(1)). The currently approved monitoring plan requires the applicant to <br />monitor water levels in spoil well No.7. Water levels will be monitored yearly to <br />observe aquifer development. Surface water monitoring was terminated September 25, <br />1996, due to the termination of Colorado Department of Health Permit to Discharge <br />(COG-850014). <br />Information on surface water hydrology may be found in Appendix C, Volumes I and II <br />of the permit application. The operation is in compliance with the requirements of this <br />section. <br />IV. Topsoil <br />Sixty-four thousand bank cubic yards of topsoil was stripped from the Pit 1 area. The <br />recommended stripping depths for the Forelle, Manburn, Satanka, and Blackburn soil <br />series were followed. An additional 8,000 bank cubic yards was salvaged during the <br />drainage corridor construction and reduction of highwalls. This 8,000 cubic yards was <br />stripped from the Manburn soil series to a depth of 1.25 feet. Areas to be topsoiled were <br />ripped prior to topsoil placement. <br />The total of 72,000 cubic yards was spread over 81 acres. Topsoil depths were <br />confirmed during a Phase II Bond release inspection conducted by the Division on <br />October 1, 1990. Topsoil replacement thickness ranged from 6 inches to 18 inches, with <br />an average of 11 inches. The petmit commits to topsoil replacement depth of thickness <br />Canadian Strip Mine, C-81-026 22 December 5, 1996 <br />