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<br />0324iJ8 <br /> <br />116/27/96 <br /> <br />16:27 <br /> <br />'lr303 866 4474 <br /> <br />CWCB <br /> <br />;.. AG OFFICE <br /> <br />re'J 004/008 <br /> <br />the construction of the uranium mill. Approximately 200,000 cubic yards of slag remain on <br />the site, covered by 18 to 24 inches of clean backfill and 6 inches of topsoil. The location of <br />the slag is shown on the attached figure. The slag was not removed during remedial action <br />bel;lluse the material was not included under the UMTRA authority (it did not meet the <br />definition of residual radioactive material). <br /> <br />The EPA regulations also allow for contaminated materials to be left in place where removal <br />would pose a clear and present risk of injury to workers or would produce environmental <br />harm that is excessive compared to the health benefit achieved. These cases arc called <br />Supplemental Standards. Supplemental standards were applied to areas on the slope of <br />Smelter MOlllltain, the banks of the Animas River, and to an area beneath the lead slag. The <br />Supplemental Standards areas are identified on the attached map. <br /> <br />The groundwater beneath both parcels remains contaminated and will be a'tldressed during <br />Phase II of the uranium mill tailings remedial action project. Several groundwater monitor <br />wells are present on each parcel and will remain in place until the U.S. Department of Energy <br />determines that they can be removed. <br /> <br />Additional information concerning the remedial action, groundwater conditions, lead smelter <br />slag and supplemental standards is available from the Colorado Department of Public Health <br />and Envirorunent, Hazardous Materials and Waste Management Division. <br />