| Target soil | Gravel soil |
| Metal-insolubilizing material | Metal-insolubilizing materials A and B |
| Addition amount of metal-insolubilizing material | 20, 40, 60, 80 kg/m3 |
| Leaching test method | Soil Contamination Countermeasures Act |
| Environmental quality standards for soil (As) | 0.01 mg/L or less |
| pH test method | Suspension method |
| Curing period of sample | 1 day |
| Acid or alkali addition leaching test | Geo-Environmental Protection Center |
| Regarding acid or alkali addition leaching test, the addition amount is only 20 kg/m3 | |