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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-g. <br />NPDES Sites. SCC maintains a Colorado Discharge Permit (Permit No. CO-0000221) that authorizes <br />discharges into State waters. Oudng the first five-year permit period, the Yoast Mine discharged info <br />Annand Draw from the NPDESIO pond and into Grassy Creek from the NPDES11 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 potnfs 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 <br />Frequencies, was revised to indicate those wells which exist in mining areas that would be mined <br />out at some point in time. Well YSAL10 was abandoned, since it was often flowing and was <br />suspected of contaminating adjacent alluvial wells with highly saline water. Monitoring at Wells <br />YWi4 and YOV15 was discontinued since they existed in an isolated black of coal that will not be <br />mined. Finally, Table 15-9, Surface Water Monitoring Frequencies, was revised. Monitoring at Site <br />YSSF2 has been discontinued. This site was the baseline site for the 012 Pond. It became <br />unnecessary upon completion of that pond. <br />Technical Revision 22 (2002) <br />Monitor wells YWC31 and YWCU31 had [o be abandoned in 2001 since they were about [o be buried <br />in spoils. Wells YWC33 and YWCU33 were completed in 2002 to replace these two wells. This <br />revision adds these two new wells to the monitoring program. <br />Technical Revision 28 120051 <br />In this revision, Spoil Spring #1 (YSSPGI), located above Pond 010, was added to the monitoring <br />program. Monitoring at Site YSSF3 (Sage Creek above mining) was changed from monthly (March- <br />October) to triannually (Spring, Summer and Fall). It is SCC's belief that triannual monitoring is <br />sufficient to determine the hydrological characteristics of upstream sites. Likewise, monitoring at <br />Site YSGFS (Upper Grassy Creek) was changed from monthly to triannually. <br />`.J <br />TR-28 25 Revised 03/05 <br />