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since water level fluctuations are the smallest then. The triannual frequency has been previously <br />approved by the CDMG for SCC's Seneca II and Yoast Mines. This triannual frequency is still <br />sufficient to determine both seasonal and year-to-year water level fluctuations. <br />Permit Revision No. 3 Changes <br />Permit Revision No. 3, which was submitted in 2002, deals with the mining of the Sage Creek <br />and Wolf Creek coal seams in the II-W South Expansion area. No changes on the Surface Water <br />portion of Table 1 were made. In the Springs portion of Table 1, Spring S-49 was deleted since <br />that spring was mined out in 2007. In addition, Spring 5-41, located in the northeast quarter of <br />Section 22, has been removed from the monitoring program since it no longer exists after mining <br />in that area in 1998. Also, three spoil springs located in the north and central mining areas have <br />been added to the monitoring program. <br />Five new wells have been added to the monitoring program. These wells are WSOV-24 (Sage <br />Creek coal overburden), WSC-24 (Sage Creek coal), WWCOV-24 (Wolf Creek coal overburdenl, <br />WWC-24 (Wolf Creek coall, and WWCU-24 (Wolf Creek coal underburdenl. The wells were <br />drilled and completed in August and September of 2001. The five wells will be monitored for <br />water levels and quality once per calendar quarter until the second quarter of 2002, at which <br />time they will be monitored per the sequences stated in Table 1. <br />2005 Technical Revision 52 Changes <br />Technical Revision 52, submitted in 2005, deals with changes to the hydrological monitoring <br />program. In this appendix, Table 1, monitoring at Site SW-S2W-SG17 will be discontinued. It <br />was the baseline site for Pond 017, which is now built. Monitoring at Site SW-S2W-SG7 will be <br />changed from monthly to triannual. <br />In the Springs section of Table 1, monitoring at S-5 (Pond 006 basin) will be discontinued. This <br />'spring" is actually an ephemeral stream channel. Since 1983, flow has been observed only <br />three times at this site. <br />Monitoring at Spring S-7 (Pond 009 basin) will also be discontinued. This "spring" is also an <br />ephemeral stream channel. Water quality data provided in 2004 Seneca II-W AHR (pgs. E-105 <br />and E-106) indicate that mining has had very little impact on this stream. Electrical conductivity <br />values peaked in 1998 (1060 ySl and have decreased since then. Total dissolved solids values <br />peaked in 1997 (680 mg/II and have decreased since then. <br />Monitoring at Spring 5-45 (DISOn Ranch) will also be discontinued. This "spring" is actually a <br />three-foot diameter culvert clearwell placed in the alluvium of Dry Creek. Since a well was <br />drilled on the Olson Ranch in 1980, this "spring" has never been put to use. <br />TR-52 15-3a-2 Revised 03/05 <br />