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ITEM 1: HISTORY OF SPILLS <br />amz <br />No spills have occurred in the three years preceeding the <br />effective date of this permit at JD -7. <br />It is extremely unlikely that a spill from the JD -7 would impact <br />surface waters of the State. This assertion stems from the fact <br />that East Paradox Creek (an intermittent stream) is more than two <br />(2) miles from JD -7 and the Dolores River is yet another 4.5 <br />miles removed from the site. With respect to whether any spills <br />at the JD -7 could impact ground waters of the State, the material <br />spilled would have to saturate the ground and begin to infiltrate <br />into and be absorbed by the soils formed from the Brushy Basin <br />Member of the Morrison Formation.' The Brushy Basin Member is a <br />variegated bentonitic mudstone containing interbedded sandstone <br />and conglomeratic sandstone lenses with the bentonitic mudstone <br />forming three - fourths of the member. Infiltration through the <br />soils and mudstone is slow, on the order of fractions of feet per <br />day. Because the Western Slope Operations Environmental <br />Technician makes three site visits per week , any spills would be <br />identified, and cleanup begun before the spilled material could <br />impact ground waters of the State. <br />' Beard, H.R., Nichols, I.L., and Seidel, D.C., Absorption <br />of Radium and Thorium from Wyoming and Utah Uranium Mill <br />Tailings Solutions, Bureau of Mines Report of <br />Investigations, 1979. Number 8396, Untied States <br />Department of the Interior. <br />2 Shawe, D.R., Simmons, G.C., and Archbold, <br />N.L., "Stratigraphy of Slick Rock District and Vicinity, <br />San Miguel and Dolores Counties, Colorado," Geological <br />Survey Professions Paper 576 -A, United States Government <br />Printing Office, Washington, 1968. <br />Materials Containment Plan - Page 2 <br />