Material Characteristics OPTIONS Grain size Geotechnical conditions Volume of material Chemical contamination and ASS Gravel, rock, sand or a mixture Geotechnical characteristics Direct function of area to be Can accommodate LAND RECLAMATION suitable for load bearing must suit end use (e.g. load reclaimed. Depth of contaminated material with (sub-tidal creation of (construction). Clays and silts bearing). reclamation limited to ~1 m for treatment/capping/lining. ASS land) potentially suitable for creation silt/clay material due to drying material requires of parks/recreation areas. time. management. Any material potentially Geotechnical characteristics Large areas of land are Can accommodate CONSTRUCTION FILL suitable depending on end must suit end use (e.g. load required for drying sites for contaminated material with (supra-tidal) use. Silt and clays can take bearing). silt/clay material. Only small treatment/capping/lining. ASS years to dry out and may need volumes of dredge spoil can material requires further treatment to quicken be dried, processed and management. the process. Material needs to transported at any one time be dried to approximately due to land space availability per cent moisture content and infrastructure required. to enable re-handling with machinery. Any material can be suitable. Material must be of Large areas of land are Yes. Contaminated dredge MINE REHABILITATION Silt and clays can take years geotechnical characteristics required for drying sites to spoil can be mixed with to dry out and may need for end use e.g. engineering fill accommodate spoil. Only chemicals for binding further treatment to quicken if roads are going to be built small volumes of dredge spoil purposes (e.g. ash) to form the process. Material needs to on land needs to have load can be dried, processed and engineered fill with low be dried to approximately bearing geotechnical transported at any one time permeability for use in strip per cent moisture content properties. due to land space availability mines. Treatment may be to enable re-handling with required for ASS's with lime to
OPTIONS Material Characteristics Grain size Geotechnical conditions Volume of material Chemical contamination and ASS LAND RECLAMATION (sub-tidal creation of land) Gravel, rock, sand or a mixture suitable for load bearing (construction). Clays and silts potentially suitable for creation of parks/recreation areas. Geotechnical characteristics must suit end use (e.g. load bearing). Direct function of area to be reclaimed. Depth of reclamation limited to ~1 m for silt/clay material due to drying time. Can accommodate contaminated material with treatment/capping/lining. ASS material requires management. CONSTRUCTION FILL (supra-tidal) Any material potentially suitable depending on end use. Silt and clays can take years to dry out and may need further treatment to quicken the process. Material needs to be dried to approximately per cent moisture content to enable re-handling with machinery. Geotechnical characteristics must suit end use (e.g. load bearing). Large areas of land are required for drying sites for silt/clay material. Only small volumes of dredge spoil can be dried, processed and transported at any one time due to land space availability and infrastructure required. Can accommodate contaminated material with treatment/capping/lining. ASS material requires management. MINE REHABILITATION Any material can be suitable. Silt and clays can take years to dry out and may need further treatment to quicken the process. Material needs to be dried to approximately per cent moisture content to enable re-handling with Material must be of geotechnical characteristics for end use e.g. engineering fill if roads are going to be built on land needs to have load bearing geotechnical properties. Large areas of land are required for drying sites to accommodate spoil. Only small volumes of dredge spoil can be dried, processed and transported at any one time due to land space availability Yes. Contaminated dredge spoil can be mixed with chemicals for binding purposes (e.g. ash) to form engineered fill with low permeability for use in strip mines. Treatment may be required for ASS's with lime to
gbr-dredge-material-management-appendixa.docx