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HAZARD (physical release or contaminant) <br />Volume (m <br /><20] <br />20 -400 <br />Sediments: <br />Basis <br />negligible <br />very low <br />low <br />400 -2,000 <br />medium <br />2,00- 12,000 <br />high <br />>12,000 <br />Basis <br />Concentration (mg /1) <br />negligible <br /><5 <br />very low <br />5 -100 <br />low <br />100 -1,000 <br />medium <br />1,000 - 50,000 <br />high <br />>50,000 <br />Physical: <br />Basis <br />Slope failure (tonnes) <br />negligible <br /><50 <br />very low <br />50 -1,000 <br />low <br />1,000- 10,000 <br />medium <br />10,000- 100,000 <br />high <br />>100,000 <br />ARD: <br />Basis <br />pH <br />negligible <br />6.5 -9.0 <br />very low <br />4.2 -6.4 <br />low <br />3.8 -4.2 <br />medium <br />3.4 -3.8 <br />high <br /><3.4 <br />Metals: <br />Basis <br />Copper (mg /1) <br />negligible <br /><0.002 <br />very low <br />0.002 -0.05 <br />low <br />0.05 -1 <br />medium <br />1 -10 <br />high <br />>10 <br />Mercury: <br />Basis <br />Mercury (total in ug /l) <br />negligible <br /><0.1 <br />very low <br />0.1 -0.5 <br />low <br />0.5 -1 <br />medium <br />1 -20 <br />high <br />>20 <br />Total Cyanide: <br />Basis <br />Cyanide (mg /1) <br />negligible <br /><0.005 <br />very low <br />0.005 -0.01 <br />low <br />0.01 -0.02 <br />medium <br />0.02 -0.02 <br />high <br />>0.05 <br />Fuel and Lubricants: <br />Basis <br />Fuel or lubricant (liters) <br />negligible <br /><50 <br />very low <br />50 -500 <br />low <br />500 -5,000 <br />medium <br />5,000 - 50,000 <br />high <br />>50,000 <br />1 <br />• <br />26 RISK ASSESSMENT /MANAGEMENT <br />TABLE 2 <br />SUMMARY OF DESCRIPTORS DEVELOPED <br />FOR QUALITATIVE HAZARD ASSESSMENT <br />• <br />