Table 2.

Ranges in percentage of water-leachable elemental toxicants measured in different sample types.

Sample type (n samples)	Lead % leached	Mercury % leached (n RL)	Manganese % leached	Arsenic % leached (n RL)	Antimony % leached (n RL)
Processed ores (3)	0.00015–0.018	< 0.1–0.7 (1)	0.09–2.9	< 0.2 (3)	< 0.01 (3)
Washing area soil (1)	0.01	0.1	0.17	< 0.2 (1)	0.03
Sweep samples (3)	0.003–0.008	0.03–0.3	0.06–0.1	< 0.2 (3)	< 0.01–0.01 (2)
Percent leached = 100 × (ppm leached)/(ppm total in solid), where (ppm leached) = (mg/kg leachate) × (20 kg ­leachate/1 kg solid). (n RL) indicates number of samples with concentration below analytical method reporting limit.