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-`-_-_ ..BOGIES INC. Tc~~03-792-E633 May; 93 231 No.003;P:b-s~:i _ <br />- --- - <br />18. TABLE 5: Would bismuth nitrate be better than cadmium nitrate if - <br />sulfide is present? Both nitrate and nitrite are interferenu in the ~anide <br />analysis procedure and will need to be corrected for by the analyst. Will <br />nitrates oxidic any cyanide in the sample leading to low results? _ _ _ <br />19. The general description of the QA/QC protocol as descn'bedseems <br />reasonable and the ryanide analysis methods proposed have worked for <br />EPA water and waste water samples. Since there will be a major glMantity <br />of paperwork created in the course of the analysts, I would suggest ~n on- <br />going trend report for the constituents of major concern (cyanidJe and <br />specific metals) on a biweekly or monthly basis so that the trends axe not <br />lost sight of in the mass of results. These trend analyses should be <br />distnbuted as are the analytical results themselves. <br />_ Zfl With respect to the cyanide analyses, it is prudent to contique to <br />- monitor for both free and complex cyanides so that there is an opportunity <br />to check mass balance relationships for total and complexed cyanides as <br />an internal check on analytical validity. It may also be appmpri~te to <br />consider analysis for the ryanides not ameaable to chlorination (CNATC} <br />as a species of possible future concern <br />21. It would be valuable to have access to some meteorological data taken <br />in conctrt with the sampling program to correlate such factors as ice Cavtr ----- <br />and temperature with any observed excursions in ryanide levels i~ the <br />impoundaments. ~-- -- --- - <br />- ------ - --- --- ----~~~~y+l1~-- <br /> <br />3 <br />