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<br />R. G. OTTO & ASSOCIATES <br />r <br />variability in the two data sets are sufficie~it <br />to preclude nay positive conclusion regarding a change <br />is uranium concentration. However, it is cer~~ain that <br />the cross-pile change, if any, is very small relative <br />to natural, background fluctuations and that ~iranium <br />levels is Ralston Creek below the waste rock ~~ile are <br />consistently well below the Colorado Water Quality <br />Standard of 59 uqm/1 (40 pCi/1). <br />III. Necessity for Runoff Control Alternatives. <br />The Colorado State Dischazg• Permit (Page 15) requires that <br />runoff control alternatives be considered }~ the Waste <br />Rock Pile Studp demonstrates that elevated coaceat:ratioas <br />in excess of effluent limitations occur as a consequence <br />of runoff or seepage from the waste rock piles. T'he absence <br />of such elevations in stream concentrations for all measured <br />parameters eliminates the necessity for any further <br />consideration of such alternatives. <br />L~J <br />44 <br />