Manly Lagoon Dredging Project - Manly Council - NSW Government

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Manly Lagoon Dredging Project – Review of Environmental FactorsPrepared for Manly and Warringah CouncilsStakeholderDPI(Fisheries)(now I&INSW)Issues Raised/CommentsMatters to be Addressed:Maps and plans of the study area must be provided, withlocation of affected areas, location of aquatic and riparianvegetation in the area and a description of these habitats;Description of dredging activities must be provided in full,noting that DPI prefers cutter suction dredging to most othermethods;Sediments to be extracted should be tested for contaminantsprior to any works;Environmental safeguards to be used during and after worksmust be described, noting that silt curtains should beinspected daily and maintained;The BioNet database is a resource which may assist indesktop review of aquatic fauna and habitat assessment;It may be determined from the desktop review that a detailedaquatic survey may be required. As advantage of detailedsurveys (before and after dredging) is that they provide anopportunity for Council to monitor the effectiveness of theproposal with respect to changes in fish andmacroinvertebrate assemblages, water and sedimentchemistry and other environmental indicators; andList threatened species, endangered populations andendangered ecological communities likely to occur in thestudy area, and describing migratory fish migration patterns.Assessment of Likely ImpactsIndicate the location, nature and extent of habitat removal ormodification which may result from the proposal, and discussthe potential impacts;Describe the species whose migratory or general patterns ofmovement could be affected in the event that the proposalrepresents a barrier to fish passage; andDescribe and discuss any other potential impacts of theproposal on fish or their habitat.Ameliorative MeasuresConsider how the proposal has been or may be modified andmanaged to conserve fisheries habitat on the subject siteand in the study area; andAny proposed pre-construction monitoring plans or on-goingmonitoring of the effectiveness of the mitigation measuresmust be outlined in detail.In the event of a request for concurrence with the Director-General ofI&I NSW please ensure that one hard copy is forwarded to I&I NSW’spostal address and that one electronic copy is forwarded to MarcelGreen’s email address (marcel.green@dpi.nsw.gov.au) in order forthe request to be processed.Addressedin REFFigure 2.1(study area),Section5.3.1, andFigure 5.9(seagrass)Section 2.5.1Section 3.3andAppendix CSection 6.1Section 5.3.1Section 5.3.1andAppendix FSection 5.3.1Section 5.3.1Section 5.4.2Section 5.3.1Section 5.3.1Section 5.3.1andAppendicesF, G and HSection 4.112 July 2010 Cardno (NSW/ACT) Pty Ltd 22H:\Doc\2010\Reports.2010\Rep2580v4.doc
Manly Lagoon Dredging Project – Review of Environmental FactorsPrepared for Manly and Warringah CouncilsNo initial response to the consultation was received from the Metropolitan Local AboriginalLand Council; however follow up phone calls and correspondence was undertaken inAugust/September 2009 regarding Aboriginal Land Claim and Native Title issues withinManly Lagoon (Section 5.5.1).No formal response to the consultation was received from Warringah Council. However, as aproject partner, Warringah Council have dedicated significant resources to the project.Specific input from Warringah Council has included: Identifying flooding related impacts (considered in Section 5.3); Input into the licensing and approvals process; Consideration of how to minimise environmental impact through appropriate projectdesign; and Undertaking flora and fauna surveys and completing Seven Part Test assessmentsfor identified threatened species which may potentially occur in the works area.No response to the consultation was received from DWE (now DECCW), the RTA or theCMA.At the time of the consultation described above, the proposed disposal method of the dredgespoil was disposal at a suitable landfill site, and for insitu drainage from floating barges to theLagoon. Following this initial consultation, the proposal was changed to allow for dewatering,and rather than assuming disposal of the dredge spoil to landfill, allow for potential beneficialreuse of the material. However, if the treated material is not suitable for reuse, then disposalto landfill will take place as the contingency measure.Trial dredging, dewatering and testing (Section 3.3) of a limited amount of sedimentoccurred in July and August 2009. The results indicated that reuse was feasible and that theoverburden water could be returned to the Lagoon without identifiable environmental harm.In light of these changes, and the positive results from the dredging trials, Cardno advisedthe stakeholders of the changes and the associated practical implications on 24 September2009. Table 3.2 identifies additional comments received from the LPMA, and where theseare addressed in the REF.I&I NSW, LPMA, Manly Council and Cardno met on 14 October 2009 to discuss some of thepractical implications of the changes to the proposal, including, at the request of I&I NSW,the criteria for defining first and second flush water. The meeting, and further discussion on15 October 2009 satisfactorily resolved the outstanding issues.All stakeholders, with the exception of the RTA and Warringah Council, were formerlycontacted by telephone on 9 October 2009. All consultees noted the update to the scope ofthe dredging project, however only LPMA provided formal further comments forconsideration in the REF as detailed in Table 3.2.The communication teams in both Manly and Warringah Councils will develop a strategy fora Community Consultation Plan, as a means to inform the community of the project andprovide ongoing information to the public for the duration of the project.2 July 2010 Cardno (NSW/ACT) Pty Ltd 23H:\Doc\2010\Reports.2010\Rep2580v4.doc
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Manly Lagoon Dredging Project - Manly Council - NSW Government

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