Manly Lagoon Dredging Project - Manly Council - NSW Government

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Manly Lagoon Dredging Project – Review of Environmental FactorsPrepared for Manly and Warringah Councils UTS Freshwater Ecology Report 2003: Community Guided Research Focusing onthe Manly Lagoon Catchment undertaken by UTS (2004).The recent study (undertaken in July 2009) indicates that no seagrass beds exist in the areawhere proposed dredging works are to take place. The results of this study are discussedfurther in Section 5.4.1.Trial Dredging MethodologyAssessment of the proposed dredging methodology for Manly Lagoon is contained in thefollowing specialist studies: Results of Trial Dredging 2 – Manly Lagoon Dredging Project undertaken by CardnoEcology Lab (2009c) for this REF (contained in Appendix C).This study indicates that the proposed dredging methodology, using the polymer ULTIMER7757, is suitable and feasible. The results and implications of this study are discussed inSection 3.3.Water QualityInformation on water quality within Manly Lagoon is contained in the following specialiststudies: Draft Manly Lagoon Rehabilitation Works, Sediment Removal from Sites 1 and 2,Statement of Environmental Effects, involving further reporting of sediment samplingundertaken by PBP (2003a); and Manly Lagoon Dredging Project – Water Quality Monitoring Program, ProgressReport 1 – Before Dredging undertaken by Cardno Ecology Lab (2010) andcontained in Appendix H.The results of these studies are discussed further in Section 5.3.3.2 Stakeholder ConsultationExtensive stakeholder consultation, including formal communication, meetings and informaldialogue has been carried out in support of the REF. None of the consultee responses haveidentified any significant barriers to the project, however, a number of the mitigationmeasures proposed in Sections 5 and 6 have been directly developed to manage issuesidentified during the consultation process.The following agencies and groups were consulted regarding the proposal: Department of Environment and Climate Change (DECC) (now Department ofEnvironment, Climate Change and Water (DECCW)); Department of Lands (DoL) (now Land and Property Management Authority (LPMA)); Department of Planning (DoP); Department of Primary Industries (DPI) (now I&I NSW);2 July 2010 Cardno (NSW/ACT) Pty Ltd 18H:\Doc\2010\Reports.2010\Rep2580v4.doc
Manly Lagoon Dredging Project – Review of Environmental FactorsPrepared for Manly and Warringah Councils Department of Water and Energy (DWE) (now DECCW for Water and I&I NSW forEnergy); Metropolitan Local Aboriginal Land Council (MLALC); Roads and Traffic Authority (RTA); Sydney Metropolitan Catchment Management Authority (CMA); and Warringah Council.The agencies were notified via post on 28 May 2009 and asked to provide comments on theproposals (dredging and dredge spoil disposal methods) as they stood at that time. Thevarious issues raised are outlined Table 3.1. A copy of the stakeholder responses receivedis provided in Appendix B.Table 3.1: Summary of Issues Raised and Responses of ConsultationStakeholderDECC (nowDECCW)Issues Raised/CommentsThe project is not considered to be a “scheduled activity” and doesnot require an Environmental Protection Licence under theProtection of the Environment Operations Act 1997 (PoEO Act).DECC (now DECCW) will be the appropriate regulatory authority toManly Council and may wish to monitor works as they areundertaken.DECC (now DECCW) considers the following issues regarding theproposal will have potential environmental impacts that could breachsections of the PoEO Act:2 July 2010 Cardno (NSW/ACT) Pty Ltd 19H:\Doc\2010\Reports.2010\Rep2580v4.docProposed method of dredging and water quality:oooooUsing an amphibious dredger will cause high disturbanceto the water column and highly turbid water in the worksarea;The silt curtains should not be raised until the totalsuspended solids (TSS) in the works area is less than50mg/litre to prevent fine silt water pollution downstream;A water quality monitoring program needs to be in placeduring the proposed dredging works to determine thetime at which silt curtains can be raised to preventpollution of waters;The water quality monitoring program should monitorTSS, a suite of metals and nutrients and the presence ofpesticides and hydrocarbons;Results of TCLP testing are required for the waterdrained from the dredged material to determine whetherthis water is contaminated and if so it cannot be allowedto return to the lagoon.Other environmental issues:oA comprehensive Environmental Management Plan(EMP) should be prepared to address the followingissues:Addressedin REFSection 4.2NotedSection 2.5.1and Section5.3For Summaryof EMPs seeSection 6.2• Noise and vibration impacts; Section 5.6• Contamination; Section 5.1• Water management; Section 5.3• Waste management; Section 5.10
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Manly Lagoon Dredging Project - Manly Council - NSW Government

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