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Subsidence and Phreatic Level Monitoring <br />SGC currently monitors subsidence monuments and phreatic well levels on Tailings Pond <br />#4 2-3 times per yeaz. This has been in effect since 1989 when the deposition method <br />was changed to increase the life and total potential height (storage) of the facility. <br />With the current reclaimed status of Tailings Pond #4, SGC believes subsidence <br />monitoring no longer provides any useful purpose and requests that it be eliminated from <br />the permit monitoring requirements. The subsidence monitoring has shown no significant <br />change throughout the monitoring period and it is even less likely it will in the future. <br />Phreatic well levels were being taken for the same reason as subsidence monitoring, to <br />provide design information for the potential to increase the expected life and total <br />potential height (storage) of the facility. Since there is no potential that SGC will need to <br />increase the storage capacity of Tailings Pond #4, SGC requests that this monitoring <br />requirement also be terminated. <br />CN Monitoring <br />SGC currently includes CN as a pazameter in upstream, downstream and site monitoring. <br />Throughout the monitoring history, CN has been non-detect. Since there aze no plans to <br />introduce CN into the system and there is a long history ofnon-detect monitoring as <br />evidence that CN is not a pazameter of concern, SGC requests that CN be eliminated <br />from the required monitoring pazameters. <br />Included with this request for a Technical Revision to the reclamation plan for Tailings <br />Pond #4 is a $150 check for the application fee. Please contact me if you have any <br />questions on this Technical Revision or if this submittal is not approvable as submitted. <br />Sincerely, <br />~~ <br />Larry Perino <br />Reclamation Manager <br />