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WASHINGTON. G.C. 20460 <br /> 1 �` 7v1 11 X965 OFFICE OF <br /> SOCIO WASTE A-140 EMERGENCY AESPONS <br /> MEMORANDUM <br /> SUBJECT: Intrim Thresholds for Toxic Gas Generation <br /> -Rea tivity (§261 .23 (a) (5) ) <br /> FROM: Eil en• Claussen, Director <br /> Cha acterization & Assessment Division (WH-5623) <br /> TO: Sold Waste Branch Chiefs, Regions I to X <br /> • Over the ast year, we have received many inquiries about <br /> how to evalua a wastes for reactivity ( §261 .23 (a) (5 ) ) • We have <br /> initiated a nu ber of 'studies in this area, and expect to propose <br /> a cuantitative threshold for toxic gas generation reactivity <br /> in December of this year: On an interin, basis, however, we <br /> feel strongly at wastes releasing -or_ thin the fo:lc%,!4 <br /> .levels of .toxi gas should be regulated as hazardous :was�e,s: <br /> Total vailable Cyanide: '250 mg HCN/Kg waste <br /> Total vailable Sulfide: 500 rag R2S/Kg waste <br /> - - The available yanide or sulfide should be measured using the <br /> attached draft testing methods . Work currently being done on <br /> the agitation d waste introduction steps may result in <br /> significant ch nges in the subsequent proposed test. Howeyer, <br /> pending the co clusion of the investigations, we recommend use <br /> of this draft rocedure. <br /> I have at ached a brief outline of the methodology we have <br /> employed to de ive these interim thresholds. Work on estimating <br /> dispersion fac ors, however, is currently in progress. Any <br /> comments or su gestions you may have with respect to either the <br /> draft test met od or the approach to establishing thresholds <br /> would be appre iated. <br />