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requirement of SCC to account for water used for mining-related purposes. Also, any releases of <br />water that will be required in the future to replace "out-of-priority" depletions caused by SCC 's water <br />usage must also be accounted for. A discussion of SCC's water rights and the approved plan for <br />augmentation is contained in Tab 16, Protection of the Hydrologic Balance. Appendix 16-1 of Tab 16 <br />presents a summary of monitoring required by the Colorado State Engineer's Office (Division of <br />Natural Resources) to ensure SCC's compliance with the approved plan for augmentation. <br />1991 Surface Water Monitoring Prooram. This monitoring program is contained in Appendix 15-3. <br />Upon approval of Permit Revision Number 1 (PR1) in October, 1991, Peabody incorporated the <br />monitoring program detailed in Appendix 15-3. This revision basically added two surface water sites <br />and changed some monitoring frequencies. <br />Permit Renewal 2 (November, 1995) modified the ground water monitoring program. No changes <br />were made to the surface water monitoring program. <br />Monitoring at five spring sites will continue on asemi-annual basis for field parameters and according <br />to the surface water parameter long list. Spoil springs will be incorporated into the ongoing spring <br />monitoring program as they develop. SCC will conduct a survey each year following the snowmelt and <br />record the locations of all spoil springs with discharges of at least 5 GPM. Locations will be reported <br />to the Division in the next successive AHR. During high flow season, monthly field parameters will be <br />• measured and one full suite laboratory sample will be collected at spoil springs. During the low flow <br />season, field parameters will be measured once, and one full suite laboratory analysis will be <br />conducted. <br />Current Surface Water Monitoring Program. The 1998 monitoring program (Appendix 15-3A) was <br />instituted upon the approval of Permit Revision 2 (II-W South Expansion, submitted 1998). The <br />details of changes made to the monitoring program may be found in the introduction to Appendix 15- <br />3A. <br />Changes to the monitoring program were made as a result of Permit Revision 3 (Sage <br />Creek/Wolf Creek coal mining) submitted in 2002. Changes are detailed in a section titled <br />"Permit Revision No. 3 Changes" in Appendix 15-3A. <br />Additional changes to the monitoring program were made as a result of Technical Revision 52 <br />submitted in 2005. Changes are detailed in a section titled "2005 Technical Revision Changes" <br />in Appendix 15-3A. <br />NPDES Monitorino. Six NPDES sites exist at the Seneca tl-W Mine, and monitoring at these sites <br />will be conducted in accordance with the requirements <br />TR-52 9 Revised 03105 <br />