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Site Reclamation Activity <br /> April 1998 - March 1999 <br /> Page 9 <br /> MONITORING - Settling, phreatic water levels and bulkhead <br /> inspections <br /> Included in Appendix A are settlement monitoring data for Tailings <br /> Pond No. 4, phreatic water level monitoring for Tailings Pond No.4 <br /> and American tunnel pressure gage readings indicating depth of mine <br /> pool. <br /> Tailings Pond No.4 settling and phreatic level monitoring does not <br /> reveal any adverse trends. The phreatic level remained low since <br /> pond reduction occurred. <br /> Monitoring of the bulkhead pressure gage in the American Tunnel was <br /> performed more often than required by TR-14. As of March 30, 1999, <br /> the pressure was 371 psi which reflects a pool surface elevation of <br /> 11, 506 feet MSL. During each monitoring visit, the tunnel and <br /> bulkhead are inspected for changes. No changes have been noted to- <br /> date. <br /> The Terry Tunnel bulkhead was inspected in July, 1998 to sample and <br /> inspect for performance according to the design. Bulkhead pressure <br /> will be constant until the mine pool rises above 11, 600 feet MSL. <br /> No problems were observed at this bulkhead. <br />