Fremantle Port Inner Harbour and Channel ... - Fremantle Ports

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Annual Survey Footprint of Offshore Disposal GroundIn accordance with Condition 5.5 of the Ministerial Conditions an annual survey of theoffshore spoil ground was conducted in December 2011. The post-dredging bathymetry datafor December 2010 showed an Offshore Disposal Area with relatively low relief (16-20 m)throughout the area and the December 2011 map was showed very similar bathymetry. Adifference in bathymetry map showed that some settling or redistribution of sedimentsoccurred from high spots to lower spots, but no significant excavation of disposed materialsoccurred out of the disposal ground. A one in five year storm event did not occur during thismonitoring period.Benthic Primary Producer Habitat Supplementary MonitoringSupplementary benthic primary producer habitat monitoring occurred at sites adjacent to theGage Roads Offshore Disposal Area during October to December 2011. This monitoringproject is entitled "Gage Roads Offshore Disposal Area Seagrass Recovery Project"(Appendix C). The purpose of the supplementary monitoring is to investigate the rate andcontrolling mechanisms of Posidonia angustifolia (Cambridge and Kuo) seagrass recoverywithin and surrounding the Gage Roads Offshore Disposal Area, subsequent to the InnerHarbour and Channel Deepening (IHD) Project. Thus far, the baseline data has beencollected for the project with additional survey scheduled for November 2012.iv Oceanica: Fremantle Ports: Fremantle Port Inner Harbour and Channel Deepening, Compliance Assessment Report 2012
1. Introduction1.1 Background and project statusFremantle Ports’ Inner Harbour Deepening Project (the Project) involved the dredging ofapproximately 3.1 million m 3 of consolidated and unconsolidated material and its disposal atan offshore spoil disposal area or its reuse in land reclamation (Table 1.1, Figure 1.1).Dredging was undertaken to deepen the Deep Water Channel, Entrance Channel and InnerHarbour to allow larger ships to utilise the Fremantle Inner Harbour. An area of seabed atRous Head has also been reclaimed using dredged material. A combination of a TrailingSuction Hopper Dredge (TSHD) Cutter Suction Dredge (CSD) was used.The dredging and reclamation works were undertaken in two main phases and a backhoedredge (BHD). Phase 1 involved an 11-week dredging program to remove sand from theInner Harbour, Entrance Channel and Deep Water Channel, with all of the sand placed intoreclamation at Rous Head. This initial phase of dredging and reclamation commenced on6 January 2010 and was completed on 21 March 2010.Phase 2 dredging was undertaken over a 12-week period between 9 August and31 October 2010 and involved the removal of rock from the Inner Harbour and the DeepWater Channel and placement of this rock into the Offshore Disposal Area. Minor backhoeworks were also carried out within Inner Harbour berth pockets between 13 December 2010and 7 January 2010 and 25 March and 12 April 2011.The key elements of the Project are provided in Table 1.1. A detailed description of theProposal is provided in Section 2 of the Public Environmental Review document (SKM 2009).Table 1.1 Key elements of the ProjectElementConstruction of a sea wallReclamationDredgingRelocation of dredged materialsDescription1000 m longApproximately 27 ha at Rous Head Inner Harbour, from a depth of RL –13.0 m to a depth of RL -15.0 m Low Water Mark Fremantle (LWMF). Entrance Channel from depths of RL -13.2 m to -13.4 m todepths between RL -16.0 m (LWMF) and RL -16.8 m (LWMF) toprovide adequate depth for turning ships. Deep Water Channel to a depth of RL -16.5 m (LWMF) onstraight sections and RL -18.0 m (LWMF) on bends, within anarea of approximately 169 ha. From the Inner Harbour (approximately 0.9 million m 3 ) and theinner section of Entrance Channel (approximately1.1 million m 3 ) to Rous Head. From the Deep Water Channel (approximately 1.1 million m 3 )to a proposed spoil ground located at Gage Roads (placementof approximately 1.45 million m 3 within an area ofapproximately 150 ha). From the Inner Harbour approximately 4,200 m 3(i.e. 0.0042 million m 3 ) of consolidated limestone will beexcavated and disposed of within the Inner Harbour.Timing Dredging of dredging works up to 30 weeks in aggregate1.2 ScopeOn 18 August 2009, the West Australian Minister for Environment granted environmentalapproval of the Project under the Environmental Protection Act 1986 (MinisterialStatement 801). In fulfilment of Conditions 4.1 and 4.2 of Ministerial Statement 801(Appendix A), a Compliance Assessment Plan (CAP) (Oceanica 2010a) was prepared to thesatisfaction of the Chief Executive Officer (CEO) of the Office of the Environmental ProtectionAuthority (OEPA), with a letter of acceptance of the CAP received 18 March 2010. An agreedaudit table comprises the key component of the CAP.Oceanica: Fremantle Ports: Fremantle Port Inner Harbour and Channel Deepening, Compliance Assessment Report 2012 1
Page 1: Fremantle Port Inner Harbour and Ch
Page 5 and 6: Client: Fremantle PortsDocument his
Page 7 and 8: ContentsExecutive Summary .........
Page 9: Executive SummaryProject StatusFrem
Page 13 and 14: Figure 1.1Dredge areas, reclaimed a
Page 15 and 16: Table 2.2 Audit tableAuditCode801:M
Page 17 and 18: AuditCodeSubject Action How Evidenc
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Page 21 and 22: Figure 3.2 Differences in bathymetr
Page 23: A one in five year storm event (as
Page 26 and 27: 5. SummaryThere were zero non-compl
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Page 33 and 34: STATUS OF THIS DOCUMENTThis documen
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Page 37 and 38: 6-3 If the Water Quality Monitoring
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Page 47: Fremantle Ports1 Cliff StreetFREMAN
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Executive SummaryOceanica Consultin
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1. Introduction1.1 BackgroundThe Ga
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Figure 1.2Gage Roads habitat map in
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Figure 1.3Bathymetry for Gage Roads
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Figure 1.4 Benthic habitat within G
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2. Methods2.1 Benthic habitat surve
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2.2 Seagrass recovery2.2.1 Permanen
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Table 2.1Seagrass sites, zone desig
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Table 2.3Limits of Reporting (LOR)
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Sediment nutrients and metalsNutrie
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3. Results3.1 Benthic habitat mapA
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Figure 3.2 Benthic habitat post dis
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3.2 Seagrass recovery3.2.1 Seagrass
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Table 3.4PERMANOVA table of results
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Table 3.7Data ranges and detection
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The bathymetry data for December 20
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Bathymetry data from December 2011
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4. DiscussionWithin the Offshore Di
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6. AcknowledgementsThis report was
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Appendix AGeo Oceans Report
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Benthic Habitat AssessmentTowed Vid
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1. IntroductionGeo Oceans was commi
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Table 2 Tide predictions for the Po
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Figure 1 Substrate and biota habita
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Figure 2 Depth data collected durin
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Appendix 1: Video analysis biologic
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Appendix BGeoImage Report
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Table of ContentsIntroduction......
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Figure 1: Study site overview for s
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Project 1Project 1 aimed to generat
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Figure 2: Tier 1 classification res
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Limitations and assumptionsA number
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Appendix CSeagrass Monitoring Site
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Appendix ESeagrass Shoot Count Data
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Appendix GSediment Field Log
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Appendix INutrient and Metals Data
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MarineandFreshwaterResearchLaborato
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