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Site Reclamation Activity April 2002 - March 2003 Page 8 - Water Quality Included in Appendix A is water quality data for; 1) Mayflower Millsite area a) Animas River above (AR3.5) and below (AR4) complex. b) Boulder Creek above (BC1) and below (BC2) tailings ponds. c) monitoring wells on the banks of the Animas River down gradient from Tailings Pond #3 (EOMW1 and EOMW2) d) diversion ditch flow between Tailings Pond #3 and Tailings Pond #4, up gradient of TP #3, (SCTP3-1) and before entry to the Animas River (SCTP3-2). 2) American Tunnel area a) Cement Creek above (CC1/CC1A/CC1B) and below (CC2) complex. b) Springs in the area of the now reclaimed waste dump (ATS1, ATS2). 3) Eureka Creek between Sunnyside Basin and the Terry Tunnel (ECl). - Discussion of Water Quality Monitoring Results 1) Mayflower Millsite area The Animas River and Boulder Creek monitoring results continue to exhibit increased zinc and manganese concentrations between the upstream and downstream monitoring points during the spring sampling event although the differential appears to have been reduced as a result of the completed diversion projects. Summer or fall sampling events have continued to show smaller or no significant change between these same points. Other surface and groundwater sample results in the Mayflower Mill area (Pond No.3 stream SCTP31 and SCTP32 and Wells EOMW1 and EOMW2) were at or below levels of metals observed in the past. 2) American Tunnel area Cement Creek monitoring reflects some improvement due to stream treatment. Seeps entering the stream bed between CC1 and CC2 carry enough metals that CC2 quality is not the same as treated effluent from the American Tunnel treatment system even though basically all of the stream flow has been treated from August through the end of April, since 1996 (except for June 1999-November 1999 when treatment was temporarily suspended).