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<br />Letter to Ken Kluksdahl, BMRI <br />Technical Adequacy of TR-O11 <br />page 2 <br />(4> Please provide design details concerning the floor slab and curbing <br />proposed to provide containment for the new flo-bin Storage area. Does <br />the slab incorporate a sealing membrane or compacted barrier? How high <br />is the curb at its lowest point? <br />(5> Is there a housekeeping plan to periodically flush the containment slab <br />within the flo-bin storage area? <br />(6) The TR-Oll application appears to address only the vertical release of <br />powdered powered sodium cyanide (NaCN) or contaminated liquid to the <br />underlying containment pad. What techniques will be applied to control <br />dispersion of powdered NaCN by moving air? <br />(7) Please describe how BMRI believes the reported release of cyanide from <br />the flo-bin storage area occurred. Is there a flaw in the design of the <br />flo-bin containers, or in BMRI's current housekeeping methods? Is there <br />an additional apparatus available which could preclude the loss of <br />cyanide to the environment, such as a cover for the cyanide flo-bin <br />port? If so, please include appropriate modifications wit~iin the <br />application. <br />(8) BMRI reported that it pumped 2500 gallons of contaminated water to the <br />leach circuit and treated the affected "area" with sodium hypochlorite to <br />neutralize env remaining cyanide. BMRI also stated that "the mud was <br />scraped from the area and placed in the tailings ponds". '.Jhat steps did <br />BMR: take to de :ermine ~.vhether the yard surfacing or subgr.ade materials <br />in the affected ar=.a had been contaminated? If any subgrade materials <br />sampling ~.+as completed, what were the results? Was any sudgrage soil <br />clean uq completed or contemplated? <br />I prepared the Division's technical adequacy comments, in c:,nsultaticn with <br />Larry Oehler and Dr. Harry Posey of the Division's mineral program. No <br />comme-:s have been received from the parties. <br />If you have env questions regarginq the at:ached adequacy commer:s glease <br />contact me, Larry Oenier, or Dr. Posey, at your convenience. <br />Sincere'i curs. <br />,lames A. endleton, PhD. <br />Technical ~ Scientific Cccrdinator <br />