Manly Lagoon Dredging Project - Manly Council - NSW Government

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Manly Lagoon Dredging Project – Review of Environmental FactorsPrepared for Manly and Warringah CouncilsTable of ContentsExecutive Summary ............................................................................................................................. iiiGlossary and Abbreviations ............................................................................................................... ix1 Introduction ................................................................................................................................... 11.1 Purpose of the Report ............................................................................................................. 11.2 Background ............................................................................................................................. 21.3 Assessment Methodology ....................................................................................................... 52 The Proposal.................................................................................................................................. 72.1 Need for the Proposed Works ................................................................................................. 72.2 Previous and Ongoing Rehabilitation Works .......................................................................... 72.3 Objectives of the Proposed Works .......................................................................................... 82.4 Description of the Existing Environment ................................................................................. 82.5 Proposal Description ............................................................................................................... 92.5.1 Methodology for Proposed Works ................................................................................. 112.5.2 Proposal Timing ............................................................................................................ 132.5.3 Geotextile Products for Dewatering .............................................................................. 132.6 Calibration Period .................................................................................................................. 143 Specialist Studies, Stakeholder Consultation and Trials ....................................................... 163.1 Specialist Studies .................................................................................................................. 163.2 Stakeholder Consultation ...................................................................................................... 183.3 Trial Dredging ........................................................................................................................ 243.3.1 Testing of Treated and Untreated Sediments and ASS ................................................ 253.3.2 Testing of Runoff Water ................................................................................................ 263.3.3 Trial Dredging Results ................................................................................................... 264 Statutory and Planning Framework .......................................................................................... 294.1 State Environmental Planning Policies ................................................................................. 294.2 Pollution Control Legislation .................................................................................................. 314.3 Terrestrial Ecology Legislation .............................................................................................. 324.4 Aquatic Ecology Legislation .................................................................................................. 334.5 Water Legislation .................................................................................................................. 344.6 Heritage Legislation .............................................................................................................. 344.7 Geology and Soil Legislation ................................................................................................. 354.8 Waste and Hazards Legislation ............................................................................................ 354.9 Regional Environmental Plans (REPs) ................................................................................. 364.10 Local Environmental Plans (LEPs) ....................................................................................... 364.11 Summary of Permits, Approvals and Licences ..................................................................... 375 Environmental Assessment ....................................................................................................... 405.1 Topography, Geology and Soils ............................................................................................ 415.2 Climate and Air Quality ......................................................................................................... 515.3 Water Quality and Hydrology ................................................................................................ 575.3.1 Measurement of Turbidity ............................................................................................. 692 July 2010 Cardno (NSW/ACT) Pty Ltd vH:\Doc\2010\Reports.2010\Rep2580v4.doc
Manly Lagoon Dredging Project – Review of Environmental FactorsPrepared for Manly and Warringah Councils5.4 Biodiversity ............................................................................................................................ 705.4.1 Flora .............................................................................................................................. 715.4.2 Fauna ............................................................................................................................ 795.5 Heritage ................................................................................................................................. 975.5.1 Aboriginal Heritage ........................................................................................................ 975.5.2 Non-Aboriginal Heritage ................................................................................................ 995.6 Noise and Vibration ............................................................................................................. 1015.7 Traffic and Access ............................................................................................................... 1055.8 Utilities and Services ........................................................................................................... 1085.9 Visual Amenity and Aesthetics ............................................................................................ 1095.10 Hazards and Waste ............................................................................................................. 1115.11 Socio-Economic Factors ..................................................................................................... 1145.12 Cumulative Environmental Impacts .................................................................................... 1146 Environmental Management .................................................................................................... 1156.1 Summary of Mitigation Measures........................................................................................ 1156.2 Environmental Management Plans ..................................................................................... 1226.3 Contractor Control ............................................................................................................... 1226.4 Licensing and Approvals ..................................................................................................... 1237 Conclusions ............................................................................................................................... 1247.1 Summary of Consideration of Environmental Factors ........................................................ 1247.2 Conclusion ........................................................................................................................... 1278 Qualifications............................................................................................................................. 1289 References ................................................................................................................................. 129List of TablesTable 3.1: Summary of Issues Raised and Responses of Consultation ............................................... 19Table 3.2: Summary of Responses to Second Round of Consultation ................................................ 24Table 4.1: Summary of Requirements for Approvals, Licences and Permits ....................................... 37Table 5.1: Soil Landscapes for Proposed Works Area (After: Chapman and Murphy, 1989) .............. 41Table 5.2: Textural Properties of Sediment Samples from Vibrocores from within Manly Lagoon (After:PBP, 2002) ............................................................................................................................................ 43Table 5.3: Contaminants Present at the Former Landfill Site Adjacent to Manly Lagoon (After: EPA,2004) ..................................................................................................................................................... 45Table 5.4: Mean Values for Water Quality Parameters Throughout Manly Lagoon 1994-2002 (After:PBP, 2003a*) ........................................................................................................................................ 58Table 5.5: 1% AEP Flood Levels in Manly Lagoon (After: PBP, 2003a) .............................................. 62Table 5.6: Potential Threatened Flora at Manly Lagoon (Sources: NPWS Wildlife Atlas; BioNet; EPBCDatabase) .............................................................................................................................................. 73Table 5.7: Fish and Mobile Invertebrates (Prawns and Crabs) Caught in Manly Lagoon by TheEcology Lab^ ......................................................................................................................................... 80Table 5.8: Bird Species Recorded at Manly Lagoon by Warringah Council on 4 January 2010 (After:Warringah Council, 2010) ..................................................................................................................... 822 July 2010 Cardno (NSW/ACT) Pty Ltd viH:\Doc\2010\Reports.2010\Rep2580v4.doc
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Manly Lagoon Dredging Project - Manly Council - NSW Government

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