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,, <br />fh~~ <br />Fume Scrubber Recirculation Pump (04-PP-22) ~h~" ~~~,~ <br />The Sulfuric Acid Metering Pump stops and the ~H in thE+ pH <br />1 Adjustment Tank increases, preventing further g neration of <br />HCN. Stopping of air flow from the blower prev~nts further <br />stripping of HCN from the slurry. The agitator ontinues to dowh <br />1 run to maintain suspension of the solids. Although no hazard •,,~~ <br />is created, continued operation results in disc}~arge to the t~ <br />tailing impoundment of slurry containing higher than normalY~~~~or,~ <br />1 levels of cyanide. <br />ecrubber Extraction Fan (G4-FA-01) <br />The Sulfuric Acid Metering Pump and pH Adjus ment Blower <br />stop. The pH increases, preventing further g neration of 5v+'^" <br />HCN. Stoppage of the blower prevents further tripping of <br />HCN. The agitator continues to run to prevent settling ofn~{' <br />solids in the tank. The situation does not crea e a hazard. ws <br />Continued operation will result in discharge to he tailings "`'~~ <br />impoundment of slurry containing higher than n rural levels <br />of cyanide. <br />Sodium Hydroxide Metering Pumps (06-PP-35) <br />J The Sulfuric Acid Metering pump stops, interrupt'ng the flow <br />of acid to the pH Adjustment Tank. The slurry H increases <br />and HCN evolution stops. The scrubber continues to operate, ~ ~ W' <br />] to absorb residual HCN. Under normal conditio s, there is ~,.~~ <br />sufficient free NaOH in the circulating scrub er solution <br />to absorb this residual HCN. The agitator continues to run "' ~; <br />to maintain suspension of the solids. Continu d operation Nb' <br />results in discharge to the tailings impoundme t of slurry <br />containing higher than normal levels of cyanid . <br />Sulfuric Acid Metering Pump (06-PP-32) <br />• The flow of sulfuric acid stops and the pH in the pH <br />1 Adjustment Tank increases. HCN evolution ceases The blower Su ,,•~ '` <br />shuts down, stopping further stripping of HCN. he agitator f <br />continues to run to maintain suspension of solids. "' Y <br />Continued operation results in discharge to t e tailings v 5 <br />impoundment of slurry containing higher than n rural levels g bd/'` <br />of cyanide. <br /> <br />pj/1504rp 012591 <br />7-2 <br />1 <br />