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• Additional information collected on the volcanic diatreme confirms previous geochemical chazacterizations and indicates that water infiltrating through the diatreme will contact up to 2,000 feet of neutralizing rock before reaching the ground water system that eventually flows to the Cazlton Tunnel; and • Amendment No. 8 activities aze not expected to have a substantial effect on zinc concentrations in the Cazlton Tunnel. Additional work has been completed for proposed TR 43 by ABC. The full report titled Hydrogeochemistry of the East Cresson Mine Extension and dated May 18, 2004 is contained within Appendix 1 to this application. A total of 2,137 samples were collected from 88 drill holes in the proposed ECME and analyzed for acid/base accounting determined through carbon and sulfur analyses. The conclusions of the geochemical work in this report are: As with Amendment Nos. 7 and 8, surface mining- activities in the ECME aze not expected to result in detectable impacts on the quantity or quality of the Carlton Tunnel flows. ^ The results of the Carlton Tunnel water quality sampling indicate there has been no significant change in water flow or quality as a result of surface mining activities to date in the District. ^ The ECME will not cause any incremental increase in infiltration or any incremental increase in pazameter concentrations of water entering the diatreme. ^ The scale of mining activities already undertaken at the site is considerably greater than those proposed in conjunction with the ECME. The fundamental conclusion is that there will be no measurable effect on ground water quality or flow resulting from the proposed ECME. 4.6 Environmental Setting The environmental setting for the Cresson Project is fully described in the Amendment No. 8 application in the Volume I, Project Description, Section 4.6. The supporting information for threatened, and endangered species, vegetation, soils, and wildlife, compiled by Greystone Environmental Consults Inc., is contained in Volume III, Appendix 2 of the Amendment No. 8 application. The proposed ECME is within the Amendment No. 8 area and hence is included in the environmental study azeas defined above. Nevertheless, CC&V provides the following discussion for reference purposes. 4.6.1 Hydrology The hydrology of the Cresson Project, as described in the Amendment No. 8 application, has not changed.