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

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List of FiguresFigure 1.1 Dredge areas, reclaimed area, and offshore disposal area used duringProject works ........................................................................................................ 3Figure 3.1 Depths of disposal area after deposition of dredged material inDecember 2010 ...................................................................................................10Figure 3.2 Differences in bathymetry from post disposal December 2010 toDecember 2011 ...................................................................................................11Figure 3.3 Depths of the Offshore Disposal Area, one year after deposition of dredgedmaterials (December 2011) ..................................................................................12Figure 3.4 Wave heights at the Rottnest Waverider (November 2010 to August 2012) .........13List of TablesTable 1.1 Key elements of the Project .................................................................................. 1Table 2.1 Action implementation status (as defined by DEC 2009) ....................................... 4Table 2.2 Audit table ............................................................................................................. 5Table 5.1 Summary of relevant actions completed for the 2011 - 2012 monitoringperiod ...................................................................................................................17List of AppendicesAppendix A Ministerial Statement 801Appendix B Surface to surface volume reportAppendix C Supplementary Benthic Primary Producer Habitat Monitoringii Oceanica: Fremantle Ports: Fremantle Port Inner Harbour and Channel Deepening, Compliance Assessment Report 2012
Executive SummaryProject StatusFremantle Ports’ Inner Harbour Deepening Project (the Project) involved the dredging ofapproximately 3.1 million m 3 of consolidated and unconsolidated material using acombination of a Trailing Suction Hopper Dredge (TSHD) and a Cutter Suction Dredge (CSD).The dredged material was then used either to reclaim an area of seabed at Rous Head orplaced at an offshore spoil disposal area. The dredging was undertaken to deepen the DeepWater Channel, Entrance Channel and Inner Harbour to allow larger ships to utilise theFremantle Inner Harbour.The dredging and reclamation works were undertaken in two phases. Phase 1 involved an11-week dredging program to remove sand from the Inner Harbour, Entrance Channel andDeep Water Channel, with all of the sand placed into reclamation at Rous Head. This initialphase of dredging and reclamation commenced on 6 January 2010 and was completed on21 March 2010. Phase 2 of dredging was undertaken over a 12-week period between9 August and 31 October 2010 and involved the removal of rock from the Inner Harbour andthe Deep Water Channel and placement of this rock into the offshore disposal area. Phase 2included minor backhoe works carried out to remove a small amount of sediment(approximately 0.1% of the entire Project dredge volume) from some berth pockets of theInner Harbour between 13 December 2010 to 7 January 2011, and 25 March to12 April 2011.All works were completed by 13 April 2011.This report - Purpose and ScopeAs a requirement of Ministerial Statement 801 (WA Minister for Environment, 18 August2009), a Compliance Assessment Plan (CAP) for the Project was prepared to the satisfactionof the Chief Executive Officer (CEO) of the Office of the Environmental Protection Authority(OEPA), including an agreed audit table. Utilising the CAP and audit table as a basis forassessment, this Compliance Assessment Report documents the compliance status since thecompletion of Project works, in accordance with Condition 4.6 of the MinisterialStatement 801. Previous Compliance Assessment Reports covered Phase 1 (Oceanica 2010b)and Phase 2 (Oceanica 2011) of Project works. Copies of the Compliance Assessment Planand previous Compliance Assessment Reports can be found on Fremantle Ports website.It is noted that subsequent to approval of the CAP, Fremantle Ports received two separateapprovals under Section 45C of the Environmental Protection Act 1986 to: (i) re-orientate theoffshore disposal area; and (ii) amend the duration of dredging works from “20-26 weeks” to“up to 30 weeks in aggregate” to incorporate the period of minor backhoe works(EPA 2011a,b). The EPA considered that these changes would “not result in a significant,detrimental, environmental effect in addition to, or different from, the effect of the originalproposal” (EPA 2011b); such that the CAP remains a valid basis for compliance assessment.Compliance SummaryA summary of the compliance status of audit elements defined by the CAP are provided in thecompleted audit table of this report (Table 2.1). Few action items remain which are stillrelevant for compliance reporting during this monitoring period. Only one item requiredactive monitoring the "Annual survey footprint of the offshore disposal grounds" (801:M5.5).There were zero non-compliance issues with the conditions of Ministerial Statement 801during the post Project works period of August 2011 - August 2012.Oceanica: Fremantle Ports: Fremantle Port Inner Harbour and Channel Deepening, Compliance Assessment Report 2012iii
Page 1: Fremantle Port Inner Harbour and Ch
Page 5 and 6: Client: Fremantle PortsDocument his
Page 7: ContentsExecutive Summary .........
Page 11 and 12: 1. Introduction1.1 Background and p
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
Page 19 and 20: 3. Annual Survey Footprint of Offsh
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
Page 29: 6. ReferencesDEC (2009) Guidelines
Page 33 and 34: STATUS OF THIS DOCUMENTThis documen
Page 35 and 36: Report shall be 15 months from the
Page 37 and 38: 6-3 If the Water Quality Monitoring
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Page 47: Fremantle Ports1 Cliff StreetFREMAN
Page 51: Fremantle Ports - Gage RoadsOffshor
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Figure 1.1Figure 1.2Figure 1.3Figur
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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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