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Site Reclamation Activity <br /> April 1996 - March 1997 <br /> Page 9 <br /> As mentioned in the 1995 report, Sunnyside had sampled <br /> groundwater springs behind and above Pond #4 and one surfacing <br /> in the vicinity of the Engineering Office Site buildings. The <br /> toe drain seeps behind Pond #4 were also sampled in 1997. <br /> These seeps indicate that background groundwater quality <br /> varies and can contain significant levels of Fe, Mn and Zn. <br /> Sunnyside will collect additional information on these sites <br /> in 1997. <br /> Other surface and groundwater sample results in the Mayflower <br /> Mill area (Pond #3 stream SCTP31 and SCTP32 and Wells EOMW1 <br /> and EOMW2) were at or below levels of metals observed in the <br /> past. <br /> 2) American Tunnel area <br /> Cement Creek monitoring reflects some improvement due to <br /> stream treatment. Seeps entering the stream bed between CC1 <br /> and CC2 carry enough metals that CC2 quality is not the same <br /> as treated effluent from the American Tunnel treatment system <br /> even though basically all of the stream flow was treated from <br /> August, 1996 through the end of April, 1997. <br /> The seep ATS2, originally from the toe of the American Tunnel <br /> waste dump, has maintained the level of improvement first seen <br /> after completion of the waste dump reclamation. The seep ATS1 <br /> appears to have disappeared or relocated due to the <br /> reclamation of the waste dump. <br /> 3) Terry Tunnel/Lake Emma <br /> Eureka Creek monitoring above the Terry Tunnel continues to <br /> show the same level of improvement, as compared to previous <br /> years, as observed in 1995. <br /> 4) Mine Pool <br /> The Terry Tunnel and American Tunnel bulkhead mine pool water <br /> quality samples submitted with this report reflect the quality <br /> of water as a result of alkaline injection and in the case of <br /> the American Tunnel October sample, either the displacement of <br /> alkaline water by lower quality mine water or quality change <br /> as a result of the observed pH drop. <br /> MONITORING - Settling, phreatic water levels and bulkhead <br /> inspections <br /> Included in Appendix A are settlement monitoring data for Tailings <br /> Pond #4, phreatic water level monitoring for Tailings Pond #4 and <br /> American tunnel pressure gage readings indicating depth of mine <br /> pool . <br /> Tailings Pond #4 settling and phreatic level monitoring does not <br /> reveal any adverse trends. The phreatic level has dropped to the <br /> lowest level observed in recent years. This was the expected <br /> result of pond reduction through reclamation. and 1996 monitoring <br /> confirms the lowering of the phreatic surface. <br />