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*^' -~_., Cotter C~•~><•.ation • I i - General Office August 5, 1933 D. !" ]D]. IL-IIIIIIIIIIIIIIII 9]~~'N ES- ALAMEDAi 999 LAKEW000. GOLOI'iADO BOiAe ~.UG 1 0 1983 Mr. .filbert J. Hazle, Director Radiation Control Division Colo~O©rANDq~CLAM,aTr Colorado Department of Health p olNatural ~N 4210 East 11th Avenue Resource Denver, CO 80220 RE: P.a;iioactive Materials License No. CO 369-035 Dear Mr. Hazie: This is written to inform the Division of a proposed revision to Item 3 in Cotter's April 6, 1983, letter prepared pursuant to License Condition 13.2.5 of the above-captioned license. This revision relaxes to the proposed methodology to be employed to protect the ore and sorter reject pads at the ore sorter from a 100 year flood event. Ttre April 6, 1983, proposal involved raising the elevation of the ore pact approximately six and one half feet. UHOn further evaluation, howevE:r, Cotter has determined that the proposal ''ascribed below and shown on the attached drawing will provide flood protection equally effective as that earlier proposed, will be more cost effective and less disruF~- tive to current operations. specifically, the revised met~iod of flood protection at the ore and sorter reject pads will entail the construction of a wall eight feet in height, which will be constructed of lagging supported by vertical 1-beams adjacent to the pad. The design specifications for this wall, described on the attached drawing. will ensure adequate protection from the water force exerted by the 100 year event. The location of the proposed wall is depicted on the attached drawing. P1easF~ note that the previously proposed elevated pad alternative also 's shown on this drawing, but, the final pad elevation for this revised proposal will not be as indicated on the drawing. The final pad e~evation for this proposal will be at existing grade, approximately si.r and one half feet below the elevation. shown on this drawing.