Laserfiche WebLink
Technical Revision 58(2007)Monitoring Program Changes <br /> Due to the closing of the Seneca IIW Mine, SCC has requested a reduction in monitoring frequencies of <br /> streams, springs and wells. These reduced monitoring frequencies will be continued until a year or two <br /> before final bond release, at which time monitoring frequencies will be increased.Table 1, Current Hydrologic <br /> Monitoring Program (pages 15-3a-4 to 6), has been revised to reflect these changes. The details of the <br /> changes are provided below. <br /> For ground water monitoring wells, the frequency of water level measurements has been changed from tri- <br /> annual to semi-annual (May/June and September/October).Water quality sampling of alluvial well GW-S2W- <br /> 21A(Sage Creek)will be changed from triannual to semi-annual. Water quality sampling of all other alluvial <br /> wells will remain unchanged (semi-annual, or in some cases, triannual). Water quality sampling of bedrock <br /> wells will change from semi-annual to annual (May/June), since the bedrock wells are subject to less change <br /> in water quality than the alluvium. <br /> Water quality sampling will be discontinued at wells GW-S2W-16OV and 16W. This set of wells exists <br /> between the A/B and C/D pit areas in the north area. Well 16OV often does not have enough water in it to <br /> sample. Well 16W often does not have enough water in it to sample, or is dry. Better monitor wells exists <br /> below the A/B pit (#17 series) and C/D pit (#14 series). These wells will remain open for sampling, if <br /> necessary, prior to bond release. <br /> For stream sites, monitoring at SW-S2W-SG5(Dry Creek), SW-S2W-FG1 (lower Hubberson Gulch)and SW- <br /> S2W-FG4 (Sage Creek) have been changed from monthly to tri-annual (spring runoff, post-runoff and <br /> baseflow). For springs and spoil springs, monitoring has been changed from semi-annual to annual (May to <br /> July). <br /> All monitoring at Spring S-23 will be discontinued. This spring is located in a stream channel in an <br /> undisturbed area above Pond 006. It has an average flow of 1.15 gpm and a maximum flow of 10.3 gpm. <br /> Electrical conductivity and TDS values at this spring exhibit a stable trend. <br /> All monitoring at Spring S-48 will be discontinued. This spring is located in an undisturbed area above Pond <br /> 009. It has an average flow of 2.66 gpm and a maximum flow of 6 gpm. Electrical conductivity values at this <br /> spring exhibit a stable trend. <br /> Technical Revision 62(2008)Mid-Term Review <br /> Monitoring of Spring S-50 (french drain at abandoned W-24 well site above Pond 016) and Spoil Spring 5 <br /> (above Pond 016A)will commence at the same frequency as other springs. <br /> Technical Revision 63(2009)Ground Water Points of Compliance <br /> This technical revision assigned ground water points of compliance for the Seneca II-W Mine. Details for this <br /> revision are found in Appendix 15-313. <br /> TR-63 15-3a-13 Revised 1/09 <br />