Extractable soil cadmium 3.3.3 Cadmium in plants 3.3 Lead in soils and plants 3.3.1 Lead literature review 3.3.2 Lead in soils 3.3.2.1 Total lead in soils 3.3.2.2 Extractable soil lead 3.3.3 Lead in plants 3.4 Zinc in soils and plants 3.4.1 Zinc literature review 3.4.2 Zinc in soils 3.4.2.1 Total zinc in soils 3.4.2.2 Extractable soil zinc 3.4.3 Zinc in plants 4.0 Hazard Levels for Water 4.1 Water Quality Levels for Livestock 4.2 Water Quality Levels for Irrigation 136 5.0 Regulatory Criteria From Other Technologies 138 5.1 Criteria from Land Application of Sewage Sludge 138 5.2 Criteria from Coal Overburden Suitability for Root Zone Material 143 5.3 Criteria for Defining Hazardous Wastes 143 5.4