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Site Reclamation Activity <br /> April 1997 - March 1998 <br /> Page 8 <br /> the upstream and downstream monitoring points during the <br /> spring sampling event. Summer or fall sampling events show <br /> smaller or no significant change between these same points as <br /> observed from the July, 1996 and October, 1996 sample results <br /> and May, 1997 and September, 1997 sample results. Sunnyside <br /> plans to take at least one additional set of samples from the <br /> Animas River in 1998 to confirm this occurs annually. <br /> As mentioned in the 1995 and 1996 reports, Sunnyside has <br /> sampled groundwater springs behind and above Pond No.4 and one <br /> surfacing in the vicinity of the Engineering Office Site <br /> buildings. The toe drain seeps behind Pond No. 4 were also <br /> sampled in 1997 . These seeps indicate that background <br /> groundwater quality varies and can contain significant <br /> levels of Fe, Mn and Zn. Sunnyside will collect additional <br /> information on these sites in 1998 . <br /> Other surface and groundwater sample results in the Mayflower <br /> Mill area (Pond No. 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 through the end of April, in 1996 and 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. <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 behind the bulkheads. <br /> The Terry Tunnel water quality is probably still influenced by <br /> alkaline injection whereas the American Tunnel water quality <br /> reflects a pH drop observed in the monitoring program. <br />