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• <br />9. There is no supported indication that pollutants in substantive levels or concentrations <br />exceeding water quality standards will be released from the proposed Line Camp <br />operation to either surface or groundwater. <br />10. There is nothing about the composition of the materials to be mined that would lead <br />one to suspect that injurious levels of pollutants will be generated or released. <br />11. There is nothing notable about the mechanical means of mining proposed that would <br />produce pollutant levels of concern. <br />12. The listed chemical of concern represent a geologically unusual, perhaps <br />unprecedented, suite of elements uncharacteristic of the local rocks and mineral <br />deposit that are proposed for mining and that are present in the Dolores river valley. <br />That notwithstanding, there are no evident segregating or concentrating mechanisms <br />that would elevate any component to adverse levels, other than sediment. <br />13. Sediment discharges would be regulated by other agencies. <br />14. The notion that radon in air concentrations will increase as a result of mining is <br />without merit. <br />15. Mercury is not considered indigenous to the proposed alluvial deposit. A mechanism <br />for concentrating mercury in the local alluvium is not know. Without mercury <br />present, there is thus no mechanism for increasing river concentrations through <br />discharges from the proposed operation. <br />16. Without the presence of acid or toxic-forming substances on site, there is not <br />justification for designating this operation. <br />REFERENCES <br />Carpenter, Alden B., 1978, Origin and Chemical Evolution of Brines in Sedimentary <br />Basins, Okla. Geol. Surf. Circ. 79, p. 60-77.. <br />CDPHE-WQCC Basic Standards and Methodologies for Ground Water. <br />Hanor, Jeffrey Sl, 1987, Origin and Migration of Subsurface Sedimentary Brines, Lecture <br />Notes for Short Course No. 21, Society of Economic Paleontologists and <br />Mineralogists, 247, p. <br />Hem, John D., 1992, Study and Interpretation of the chemical Characteristics of natural <br />Water; USGS Water Supply Paper 2254, 263 p. <br />US Bureau of Reclamation (ca. 1993), Dolores River Basin Water Quality Study; <br />Prepared by USDI, Bureau of Reclamation Technical Service Center, Denver, CO, <br />and Durango Projects Office, Durango, CO. 57 p. with appendices. <br />Unattributed, (post-1975), Compilation of surface water quality data collected between <br />1969 and 1975. <br />is <br />