Table 2. Port-specific modelling scenarios for dredged material placement campaigns. Port Gladstone Rosslyn Bay Hay Point Abbot Point Townsville Cairns Dredging type Capital Maintenance Capital Capital Maintenance Maintenance Less than 7 (clays) 5 37 15 27 25 60 Per cent 7 to 35 (fine silt) 5 13 10 3 26 11 composition 30 15 10 9 38 11 by particle 35 to 75 (coarse silt) size class 75 to 130 (fine sand) 30 25 10 11 3 13 (µm) Greater than 130 (coarse sand) 30 10 55 50 8 5 Dredged material volume (m3, assumed to be 10 million 40,000 8.5 million 3.5 million 400,000 580,000 in situ volume Duration of disposal campaign (maximum 1 year 3 months 30 weeks 9 weeks 5 weeks 35 days modelling period is one year) Depth of release of material 11 m 2 m Mid-water Mid-water 5 m 11 m Estimated capacity per load (m3) 15,000 400 18,000 18,000 2900 2900 1 TSHD 1 TSHD Number and type of vessels used for disposal 1 TSHD 1 TSHD 1 TSHD 1 TSHD (Brisbane) (Brisbane) Time to release material 20 minutes 2 minutes 13 minutes 13 minutes 35 minutes 8 minutes Number of releases per day 3 1 5 8 3 8 Total Number of releases 667 90 722 167 114 167 Total number of days (assuming continuous 222 90 181 21 38 35 operations) Month of commencement March March April June September August
Table 2. Port-specific modelling scenarios for dredged material placement campaigns. Port Gladstone Rosslyn Bay Hay Point Abbot Point Townsville Cairns Dredging type Capital Maintenance Capital Capital Maintenance Maintenance Per cent composition by particle size class (µm) Less than 7 (clays) 5 37 15 27 25 60 7 to 35 (fine silt) 5 13 10 3 26 11 35 to 75 (coarse silt) 30 15 10 9 38 11 75 to 130 (fine sand) 30 25 10 11 3 13 Greater than 130 (coarse sand) 30 10 55 50 8 5 Dredged material volume (m3, assumed to be in situ volume 10 million 40,000 8.5 million 3.5 million 400,000 580,000 Duration of disposal campaign (maximum modelling period is one year) 1 year 3 months 30 weeks 9 weeks 5 weeks 35 days Depth of release of material 11 m 2 m Mid-water Mid-water 5 m 11 m Estimated capacity per load (m3) 15,000 400 18,000 18,000 2900 2900 Number and type of vessels used for disposal 1 TSHD 1 TSHD 1 TSHD 1 TSHD 1 TSHD (Brisbane) 1 TSHD (Brisbane) Time to release material 20 minutes 2 minutes 13 minutes 13 minutes 35 minutes 8 minutes Number of releases per day 3 1 5 8 3 8 Total Number of releases 667 90 722 167 114 167 Total number of days (assuming continuous operations) 222 90 181 21 38 35 Month of commencement March March April June September August
gbr-dredge-material-management-appendixd.docx