Table 3.
Excavation/disposal volumes (m3), Pb concentrations (mg/kg), and total Pb (kg) by phase.
| Area | Phase I | Phase II | Phase III | Total disposed | ||||
|---|---|---|---|---|---|---|---|---|
| Vol (m3) | Pb conc (mg/kg) | Vol (m3) | Pb conc (mg/kg) | Vol (m3) | Pb conc (mg/kg) | Vol (m3) | Pb (kg) | |
| Compounds | 2,602 | 3,863 | 5,183 | 1,029 | 3,343 | 670 | 11,128 | 21,502 |
| Common areas | 417 | 2,649 | 2,418 | 2,688 | 1,747 | 560 | 4,582 | 10,471 |
| Ponds/reservoirs | 600 | 11,280 | 1,380 | 13,100 | 700 | 8,000 | 2,680 | 37,144 |
| Process waste | 300 | 32,000 | N/A | N/A | 8,700 | 10,000 | 9,000 | 117,852 |
| Total | 3,919 | 8,981 | 14,490 | 27,390 | 186,969 | |||
| Abbreviations: conc, concentration; Pb, lead; vol, volume. Calculation uses soil bulk density of 1,600 kg/m3 with 30% bulking factor (http://www.engineeringtoolbox.com/soil-rock-bulking-factor-d_1557.html). | ||||||||