1983-06-03_REVISION - M1977285 (2)

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43.90(1) • • (i) Seepage Control Systems. Technical specifications shall be prepared for installation of seepage control systems. A quality assurance, testing, and inspection program, which includes supervision by a • qualified engineer or scientist, shall be established to assure that specifications are met. If adverse groundwater impacts or conditions conducive to adverse groundwater impacts occur due to seepage, action shall be taken to alleviate the impacts or conditions and restore groundwater quality to levels consistent with those before operations began. The specific seepage control and groundwater protection method, or combination of methods, to be used shall be worked out on a site-specific basis. (j) Tailings Disposal System. In support of a tailings disposal system proposal, the applican~licenaee shall supply the following informa- tion: (1) the chemical and radioactive characteristics of the waste solu- tions; C2) the characteristics of the underlying soil and geologic forma- tions particularly as they will control transport of contaminants and solutions. This shall include detailed information concerning extent, thickness, uniformity, shape, and orientation of underlying strata. Hydraulic gradients and conductivities of the various formations shall be determined. This information shall be gathered by borings and field. survey methods taken within the proposed impoundment area and in surrounding areas where contaminants might migrate to groundwater, The information • gathered on boreholes shall include both geologic and geophysical logs in sufficient number and degree of sophistication to allow determining significant discontinuities, fractures, and channeled deposits of high hydraulic conductivity. If field survey methods are used, they should be in addition to and calibrated with borehole logging. Hydrologic parameters such as permeabil- ity shall not be determined on the basis of laboratory analysis of samples alone. A sufficient amaunt of field testing (e.g., pump tests) shall be conducted to assure actual field properties are adequately understood. Testing shall be conducted to make possible estimates of chemisorption attenuation properties of underlying soil and rock; and (3) location, extent, quality, capacity, and current uses of any groundwater at and near the site. (k) If ore is stockpiled, methods shall be rased to minimize penetration of radionuclides and other substances into underlying soils. (1) Disposal Area Cover and Closure (1) In disposing of byproduct material, licensees shall place an _ earthen cover over tailings or wastes at the end of the uranium recovery facility's operations and shall close the waste disposal area in accordance with a design which provides reasonable assurance of control of radiological hazards to: • 43 - 22 (April 1990)