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Section 780.12(b) Continued. <br />predicted discharge is applied to one of the smallest proposed <br />sedimentation ponds, then this analysis represents a "worst-case" <br />example of pit discharge vs. detention time. Lesser amounts of <br />pumping into larger ponds would result in no effect on sedimentation <br />pond detention time. <br />Water supply for operational needs, such as haul road watering, <br />sanitary facilities, equipment washing, and other commercial and <br />industrial purposes will be obtained from water collected in the pits <br />and from the supply well at the Marr Mine office and shop and will <br />total approximately 2.56 acre-feet per year. The supply well <br />operates under Permit No. 20253-F issued by the Colorado State <br />Engineer for 3 acre-feet per year. <br />In the unlikely event that surface mining activities conducted by <br />Kerr Coal cause either qualitative or quantitative injury to another <br />water user, water legally available to Kerr Coal would be used to <br />mitigate this injury. These water rights are discussed under Section <br />779.17. <br />Monitoring Program <br />Kerr Coal will conduct a comprehensive monitoring program of surface <br />and ground water quality and quantity throughout the term of the <br />proposed mining and reclamation operations. This monitoring program <br />has been in place for the past ten years and, to date, has detected <br />no significant alterations or impacts to the hydrologic regime in the <br />mine plan and adjacent areas. <br />The plan for hydrologic monitoring consists of periodic observation <br />of the various monitoring facilities included in the approved <br />monitoring plan, which is fully described in the monitoring plan <br />section of Exhibit 42, Drainage and Sediment Control Plan. The <br />monitoring stations are shown on Map 23-2, Water Monitoring Sites in <br />Exhibit 42, Drainage and Sediment Control Plan; Map 15a, Kerr Mine <br />Area Ground Water Hydrology; Map 16a, Kerr Mine Area Surface Water <br />780-107 bbR <br />Revised - January, 1991 <br />