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Spoil springs will eventually develop as mine pits in the lower lying areas are backfilled and subsequently <br />resaturate. They will be monitored semiannually and for the same parameters as the existing springs as <br />stated in Table 15 -9. <br />NPDES Sites SCC maintains a Colorado Discharge Permit (Permit No. CO -0000221) that authorizes <br />discharges into State waters. During the first five -year permit period, the Yoast Mine discharged into <br />Annand Draw from the NPDES10 pond and into Grassy Creek from the NPDESII pond. NPDES Ponds <br />12, 13 and 14 are in the Sage Creek basin and were constructed in 1999, 2003 and 2001, respectively. <br />Monitoring of NPDES discharge points will be conducted in accordance with the NPDES permit which may <br />be found in Appendix 15 -1. <br />Hydrologic Monitor Program Revisions <br />Technical Revision 16 (2001) <br />In this revision, the following changes were made. Table 15 -8, Ground Water Monitoring Frequencies, was <br />revised to indicate those wells which exist in mining areas that would be mined out at some point in time. <br />Well YSAL10 was abandoned, since it was often flowing and was suspected of contaminating adjacent <br />alluvial wells with highly saline water. Monitoring at Wells YW14 and YOV15 was discontinued since they <br />existed in an isolated block of coal that will not be mined. Finally, Table 15 -9, Surface Water Monitoring <br />Frequencies, was revised. Monitoring at Site YSSF2 has been discontinued. This site was the baseline <br />site for the 012 Pond. It became unnecessary upon completion of that pond. <br />Technical Revision 22 (2002) <br />Monitor wells YWC31 and YWCU31 had to be abandoned in 2001 since they were about to be buried in <br />spoils. Wells YWC33 and YWCU33 were completed in 2002 to replace these two wells. This revision adds <br />these two new wells to the monitoring program. <br />Technical Revision 28 (2005) <br />In this revision, Spoil Spring #1 (YSSPGI), located above Pond 010, was added to the monitoring program. <br />Monitoring at Site YSSF3 (Sage Creek above mining) was changed from monthly (March- October) to <br />triannually (Spring, Summer and Fall). It is SCC's belief that triannual monitoring is sufficient to determine <br />the hydrological characteristics of upstream sites. Likewise, monitoring at Site YSGF5 (Upper Grassy <br />Creek) was changed from monthly to triannually. <br />0 <br />TR -28 29 Revised 03/05 <br />