BEN SCHOEMAN DOCK BERTH DEEPENING Specialist ... - Transnet

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Coast, where the entire population occupies the mid to upper intertidal (De Villiers 1975, Donn 1990, Farquhar 1995). A large population of D. serra occurs at Bloubergstrand (Big Bay) just north of the rocky shores at Blouberg. A survey in 1994/1995 revealed average densities of adult mussels (>50mm) of 68 animals/m 2 or 2.0 x 10 6 /km of shoreline. This was considerably lower than for example at Yzerfontein (97/m 2 or 2.9 x 10 6 /km) or at Elands Bay (156/m 2 or 4.7 x 10 6 /km) (Farquhar 1995). Including recruits (
150000 125000 100000 Kg 75000 50000 25000 0 Jan Feb Mar April May Month June July Aug Sept Hottentot Snoek Other Oct Nov Dec Figure 6: Average monthly landings of line fish caught between Llandudno and Koeberg for the period 2000 – 2005. Long fin tuna dominate the 'other' category, comprising 70% - 80% by mass. Data provided by Line Fish Section, DEAT/MCM) The number of boats involved in the fishery is relatively large with up to 100 boats on the water at any one time during snoek 'runs'. The area around Robben Island is important for this species. Hottentot are most regularly fished in deeper reefs 3.5 – 5.5km offshore located south of Mouille Point. 5.1.5 Biogeography and Unique Biodiversity Resources. The South African coastline can be divided into three biogeographic provinces, the cold temperate West Coast, the warm temperate South Coast and the subtropical East Coast. Table Bay falls within the cold temperate West Coast province. A study by Bolton and Stegenga (2002) on the diversity of seaweeds along the South African coast (divided into contiguous 50km coastal sections) has shown that the number of species occurring in the Table Bay area is typical for the West Coast, thus not separating this area from the rest of the West Coast. Another survey done by Emanuel et al. (1992) on the zoogeographic patterns of intertidal marine invertebrates around the South African coast also groups Table Bay within the West Coast province, not showing significant differences between rocky shore communities along the West Coast other than related to physical factors such as wave action for example. Their survey, however, was done on a relatively broad scale (coast divided into 100km stretches), but comparisons of data from various studies on rocky shore communities (or specific organisms within these communities) in the Table Bay area show similar species compositions as is found on other west coast areas (McQuaid & Branch 1984, McQuaid et al. 1985, Van Erkom Schurink & Griffiths 1990, Bustamante & Branch 1996a, Kruger & Griffiths 1998, Harris et al. 1998). Similarly, the sandy beach fauna is remarkably consistent in the entire Benguela region from the Cape Peninsula all the way up the West Coast to northern Namibia (Field & Griffiths 1991), which also includes the Table Bay area. This suggests that the communities in Table Bay are typical for the West Coast and not unique to Table Bay. The only exception to this - though not in terms of species uniqueness but rather in terms of high density and thus importance - is the white mussel (D. serra) population at 26
Page 1 and 2: BEN SCHOEMAN DOCK BERTH DEEPENING S
Page 3 and 4: the test organisms. The EC 5 is usu
Page 5 and 6: Turbidity Upwelling Vulnerable Wrac
Page 7 and 8: Another important issue is the poss
Page 9 and 10: 6.2.1.3 Settlement of material susp
Page 11 and 12: 2 METHODOLOGY For the assessment tw
Page 13 and 14: The proposed deepening of the Ben S
Page 15 and 16: 4.3 Cumulative effects Table Bay re
Page 17 and 18: undetectable in 80% of the measurem
Page 19 and 20: 5.1.3 Biological communities The ma
Page 21 and 22: Supralittoral fringe (Littorina zon
Page 23 and 24: Niambia sp. Coleoptera Diptera Tylo
Page 25 and 26: Midlittoral zone - The intertidal o
Page 27 and 28: Fish - Nearshore and in the sandy b
Page 29 and 30: 2000 at Robben Island revealed furt
Page 31 and 32: Table 2: Common whales and dolphins
Page 33: Table 3: Site, time, mean count (co
Page 37 and 38: sensitive because of its conservati
Page 39 and 40: Schoeman Dock occurred in 1971 (Pro
Page 41 and 42: Table 7: Hydrocarbon distributions
Page 43 and 44: care concentration ranges for cadmi
Page 45 and 46: SS mg/l Boxplot for TSS 80 60 40 20
Page 47 and 48: The mean values calculated above ar
Page 49 and 50: o o possibility of the dredge spoil
Page 51 and 52: The gravel sized component of the s
Page 53 and 54: Table 12a: London Convention Annex
Page 55 and 56: Benthos distributions in Block #1 -
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Page 59 and 60: 2 Cluster Dendrogram and MDS ordina
Page 61 and 62: the well developed ripples in the c
Page 63 and 64: 6 IMPACT IDENTIFICATION AND ASSESSM
Page 65 and 66: Accordingly the potential environme
Page 67 and 68: Impact Assessment Table No Mitigati
Page 69 and 70: are summarised in the table and it
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Page 73 and 74: considered to be low. Further, the
Page 75 and 76: A A B B B Figure 23a and b: Predict
Page 77 and 78: dependent on these include the harm
Page 79 and 80: structures. The apparent lack of su
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Figure 25 depicts the simulation mo
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6.2.3.2 Alteration of benthic biolo
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Impact Assessment Table No Mitigati
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Nature of impact - Turbid plumes of
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Figure 26b: Predicted worst case ex
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Figure 27b: Predicted worst case ex
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suspended sediment concentrations i
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Figure 28a: Dredge spoil dump site
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6.2.3.6 Elevated water column turbi
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The evaluation with mitigation is:
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Figure 29a: Predicted exceedance in
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6.3 Cumulative Impacts The proposed
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Impact summary Table (cont.) Impact
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Impact summary Table (cont.) Impact
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mitigated by ensuring that the Cutt
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operations at Coega Port. Prepared
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Glassom D., K. Prochazka and G.M. B
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Protekon 2006. Port of Cape Town co
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