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Mr. Bob Oswald • June 29, 1999 Page 2 of 4 4. The mine site soil conditions are described and contained in File M-77-287; soil is approximately 50% Pinion soils and 35% Torriorthents, 5% Clovis soils, 5% unnamed 30 soils and about 5% rock outcrop. 5. All structures at the mine site are owned by IUSA or IUC Colorado Plateau and will be removed during the reclamation process. Each structure was photographed, reviewed, described, measured and recorded by CDMG representative, Mr. Bob Oswald, during the January 13, 1999 pre-operation and new permit application site inspection. 6. The mine site (disturbed area) is relatively flay laying and surface water (rainfall and snowmelt) will be contained within the permit area. Shallow drainage control ditches are constntcted around the site and designed to direct any up gradient runoff around or away from the permit area. (Review CDMG January 13, 1999, site inspection report). 7. The side slope gradient of the waste rock pad during mining will be approximately 1.5:1 and set back approximately 10 feet from the perimeter of the permit boundary. 8. This response addresses both the CDMG question asking for a description of how fuel, tube, antifreeze, etc. are to be stored at the site, as well as Montrose County's question as to whether (I) designated chemicals, acid or toxic-forming chemicals would be used on the site; (2) whether or not mining could result in uncontrolled radioactive contamination that could be a potential public health risk; and (3) whether the site should be a DMO. Section 34-32-112.5(2) of the Colorado Mines Land Reclamation act provides that the Board shall exempt operations from designation (as Designated Mining Operations, or "DMO") if "acid- or toxic-producing materials will not be used, stored, or disturbed in grrarrlilies sr fficienl !n ndrersely cffecl nny perswr, cury pr•nperly, or the enviraunen! ". The definition of acid producing or toxic producing materials in Rule I relates to materials that contain "detrimental amounts of chemical constituents such as acids, bases or metallic compounds". Acid or toxic-forming materials are not exposed or disturbed at the Van 4 Mine properties in quantities sufficient to adversely affect human Health, property, or the environment. in terms of potential acid generation concerns, the host rock for ore at the mines is primarily sandstones of the Salt Wash member of the Morrison formation. These sandstones are not acid formers. Accordingly, any small volumes of waste rock left from development and mining operations will also consist of sandstone with little, if any, concentrations of the various types of sulfur or other constituents associated with acid rock generation. Further, there is no drainage of water to the surface from the mines, and the disturbed area is only 8.4 acres, an area exempt from DMO designation. Finally, those limited quantities of diesel fuel, oil,