Manly Lagoon Dredging Project - Manly Council - NSW Government

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Manly Lagoon Dredging Project – Review of Environmental FactorsPrepared for Manly and Warringah CouncilsEnvironmental Factors (State Legislation)f. Any impact on the habitat of any protected fauna (within the meaning of theNational Parks and Wildlife Act 1974)?Two colonies of Little Pied Cormorants (Phalacrocorax melanoleucos), were identifiedto be nesting at separate sites in Manly Lagoon in November 2009 (Appendix L). Thisspecies is listed as Protected under the National Parks and Wildlife Act 1974 (NPWAct).ImpactsNilIf all mitigation measures specified are adhered to during the dredging works, then nonegative impacts on this species or their habitat are anticipated. If breeding activity isapparent at the commencement of works, then the progression of dredging activitieswill be scheduled such that disturbance of breeding/nesting activities is minimised.g. Any endangering of any species of animal, plant or other form of life, whetherliving on land, in water or in the air?The proposed works will remove a number of benthic organisms from the lagoon bedwith the dredged sediment, however only limited benthic fauna are present in the areato be dredged and recovery is expected following the cessation of works.Minor -veThe proposed works are not expected to endanger any other species of animal, plant orother form of life.h. Any long-term effects on the environment?It is hoped that long term effects on the environment will include increased water andsediment quality within the lagoon, and that this will promote aquatic flora and increasebenthic fauna within the lagoon.+vei. Any degradation of the quality of the environment?If appropriately implemented, the environmental safeguards summarised in Section 6.1of this REF will ensure that there will be no degradation of the quality of theenvironment.+veIn the long term an improvement in the quality of the aquatic environment of ManlyLagoon is expected.j. Any risk to the safety of the environment?Mitigation measures discussed in Section 6.1 should negate any risk to the safety ofthe environment.k. Any reduction in the range of beneficial uses of the environment?NoNilNill. Any pollution of the environment?There will be minor atmospheric pollution in the form of exhaust emissions, associatedwith the operation of machinery. However, this will have no significant impact on theenvironment.Minorshort term–veAll other potential pollution, such as downstream movement of disturbed sediments2 July 2010 Cardno (NSW/ACT) Pty Ltd 126H:\Doc\2010\Reports.2010\Rep2580v4.doc
Manly Lagoon Dredging Project – Review of Environmental FactorsPrepared for Manly and Warringah CouncilsEnvironmental Factors (State Legislation)within the lagoon, will be managed by a range of mitigation measures and variousManagement Plans as part of the CEMP (Section 6.1).Impactsm. Any environmental problems associated with the disposal of waste?The dredging process has been designed to avoid the need for disposal of dredge spoilto landfill by proposing its beneficial reuse. Disposal of bulk items removed from thelagoon, such as shopping trolleys, may require disposal to landfill. If the dredge spoil isdetermined to be unsuitable for beneficial reuse then the material will be disposed ofsafely to an appropriate landfill site.NilRunoff water from the dewatering process not suitable for return to the lagoon mayrequire disposal offsite i.e. into the Sydney Water sewer system pending approval.n. Any increased demands on resources, natural or otherwise which are, or arelikely to become in short supply?The proposed works will not increase demands on any resources which are likely tobecome short in supply.o. Any cumulative environmental effect with other existing or likely futureactivities?NilNilNo.7.2 ConclusionThe project is expected to result in long term positive benefits including removal of theoverall contaminant load from the lagoon, improved visual amenity, improved water quality,mixing and exchange, and the maintenance of an open water area in the lagoon.Execution of the project will assist with meeting the objectives of the Manly Lagoon EstuaryManagement Plan (Manly Council and Warringah Council, 1998).The proposed works are unlikely to have any significant or long term negative environmentalimpacts providing the appropriate mitigation measures and Management Plans outlined inthis REF are implemented during the works.It is considered that the processes and mitigation measures described in this reportrepresent an appropriate scope of works to dredge the subject section of the lagoon whilstminimising the risk to the environment.2 July 2010 Cardno (NSW/ACT) Pty Ltd 127H:\Doc\2010\Reports.2010\Rep2580v4.doc
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Manly Lagoon Dredging Project - Manly Council - NSW Government

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