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=~--F_ ,BOGIES IrJC . T~303-79?-56~~ Ma~2 9^ i? ~ ~ i No . 003 ~P~t= <br />---- <br />18. TABLE 5: Would bismuth nitrate be better than cadmium nitrate if -~ --- <br />sulfide is present? Both nitrate and nitrite aze interfereats in the cyanide _ <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 resulu? ___ __ <br />19. The general description of the QA/QC protocol as descn'bed seems r <br />_ _ reasonable and the caanide analysis methods proposed have worlaed for <br />EPA water and waste water samples. Since there will be a major g4antity <br />of paperwork created in the course of the analyses, I would suggest an on- <br />going trend report for the constituents of major concern (cyanide and <br />specific metals) on a biweekly or monthly basis so that the trends ale not <br />lost sight of in the mass of results. These trend analyses shot}ld be <br />distnbuted as are the analytical resulu themselves. <br />_ 2Q With respect to tht caanide analyses, it is prudent to con ue to <br />monitor for both free and compiez cyanides so that there is an oppty <br />_ to check mass balancx relationships for total and wmplexed ryani es as <br />an internal check on analytical validity. It may also be appropri to to <br />consider analysis for the cyanides not amenable to chlorination (CN TC) <br />as a species of posstble future concern. <br />21. It would be valuable to Nava access to some meteorological data itaken <br />in concert with the sampling program to correlate such factors as ice cover --- --- <br />and temperature with any observed excursions in caanide levels ip the <br />impoundments. -_- - - - - - - - - - - - <br />3 __ ~" - -_ - ---- - <br />