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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 and <br />Wolf Creek coal seams in the II-W South Expansion area. No changes on the Surface Water portion <br />of Table 1 were made. In the Springs portion of Table 1, Spring S-49 was deleted since that spring <br />was mined out in 2001. In addition, Spring S-41, located in the northeast quarter of Section 22, has <br />been removed from the monitoring program since it no longer exists after mining in that area in 1998. <br />Also, three spoil springs located in the north and central mining areas have been added to the <br />monitoring program. <br />Five new wells have been added to the monitoring program. These wells are WSOV-24 (Sage Creek <br />coal overburden), WSC-24 (Sage Creek coal), WWCOV-24 (Wolf Creek coal overburden), WWC-24 <br />(Wolf Creek coal), and WWCU-24 (Wolf Creek coal underburden). The wells were drilled and <br />completed in August and September of 2001. The five wells will be monitored for water levels and <br />quality once per calendar quarter until the second quarter of 2002, at which time they will be <br />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 program. <br />In this appendix, Table 1, monitoring at Site SW-S2W-SG17 will be discontinued. It was the baseline <br />site for Pond 017, which is now built. Monitoring at Site SW-S2W-SG7 will be changed from monthly <br />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 three <br />times at this site. <br />Monitoring at Spring S-1 (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 and <br />E-106) indicate that mining has had very little impact on this stream. Electrical conductivity values <br />peaked in 1998 (1060 NS) and have decreased since then. Total dissolved solids values peaked in <br />1997 (680 mg/I) and have decreased since then. <br />Monitoring at Spring S-45 (Olson Ranch) will also be discontinued. This "spring" is actually a three- <br />foot diameter culvert clearwell placed in the alluvium of Dry Creek. Since a well was drilled on the <br />Olson Ranch in 1980, this "spring" has never been put to use. <br />TR-58 15-3a-2 Revised 04/07