Manly Lagoon Dredging Project - Manly Council - NSW Government
Manly Lagoon Dredging Project - Manly Council - NSW Government Manly Lagoon Dredging Project - Manly Council - NSW Government
Manly Lagoon Dredging Project – Review of Environmental FactorsPrepared for Manly and Warringah CouncilsKey:Proposed Dredging AreasFigure 5.1: Acid Sulfate Soils Risk Map for Proposed Works Site (After: Natural Resource Atlas, 2009)The sediment sampling undertaken by PBP in 2001 indicated the following results withregards to the proposed dredging areas within the Lagoon (PBP, 2002):Sediment found at the downstream end of Burnt Bridge Creek (near the confluencewith the Lagoon) poses a low acid sulfate soil risk;Sediment found in the upper portion of dredging works within the Lagoon poses a lowto very high acid sulfate soil risk; andSediment found at the lower portion of dredging works within the Lagoon poses a lowto very high acid sulfate soil risk.The proposed dredging works will be undertaken in an area identified as Class 1 AcidSulfate Soils according to Manly and Warringah’s Acid Sulfate Soil Maps contained inCouncil’s respective LEP’s (1988 and 2000, respectively). The relevant provisions of theLEPs apply to any works to be undertaken in Class 1 areas.Contaminated LandsA search of the DECCW Contaminated Land Record on 15 July 2009 for the Manly andWarringah LGAs identified four contaminated land sites; two within Manly LGA and twowithin Warringah LGA. The only Environment Protection Authority (EPA) declared2 July 2010 Cardno (NSW/ACT) Pty Ltd 44H:\Doc\2010\Reports.2010\Rep2580v4.doc
Manly Lagoon Dredging Project – Review of Environmental FactorsPrepared for Manly and Warringah Councilscontaminated site (under the Contaminated Land Management Act, 1997) of relevance tothe proposed works is the following:Addiscombe Road, Manly Vale (Manly LGA) – Former Landfill.The location of this contaminated former landfill site adjacent to Manly Lagoon is shown inFigure 5.2. It is noted that the contaminated site does not encompass any sediments on thebed of the lagoon, and is confined to the land based site as indicated in Figure 5.2.Further details of the current Environment Protection Authority (EPA) Notice for thiscontaminated lands site are contained in Appendix D. The Former Landfill site has beendeclared by the EPA as a remediation site under Section 21 of the Contaminated LandManagement Act 1997.The EPA has found that the site is contaminated with the substances listed in Table 5.3, andanalysis of sediment and water samples by both PBP (2003a) and Cardno (2009c) hasfound elevated levels of some of these contaminants in the lagoon.Table 5.3: Contaminants Present at the Former Landfill Site Adjacent to Manly Lagoon (After: EPA, 2004)ContaminantsAsbestosPolycyclic AromaticHydrocarbons (PAHs)Benzo(a)pyreneLeadCadmiumCopperZincPresence on the SitePieces of asbestos sheeting and loose asbestos fibres are present in soil,including in surface layers.Significantly elevated levels are present in soil, including in surface layers, atconcentrations exceeding the relevant health-based criteria for open spaceuse.In groundwater at concentrations exceeding criteria for the protection ofaquatic ecosystemsSignificantly elevated levels are present in soil, including in surface layers, atconcentrations exceeding the relevant health based criteria for open spaceuse.Significantly elevated levels are present in soil, including in surface layers, atconcentrations exceeding the relevant health based criteria for open spaceuse.Elevated levels are present in soil, including in surface layers.Significantly elevated levels are present in groundwater.Significantly elevated levels are present in groundwater.2 July 2010 Cardno (NSW/ACT) Pty Ltd 45H:\Doc\2010\Reports.2010\Rep2580v4.doc
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<strong>Manly</strong> <strong>Lagoon</strong> <strong>Dredging</strong> <strong>Project</strong> – Review of Environmental FactorsPrepared for <strong>Manly</strong> and Warringah <strong>Council</strong>scontaminated site (under the Contaminated Land Management Act, 1997) of relevance tothe proposed works is the following:Addiscombe Road, <strong>Manly</strong> Vale (<strong>Manly</strong> LGA) – Former Landfill.The location of this contaminated former landfill site adjacent to <strong>Manly</strong> <strong>Lagoon</strong> is shown inFigure 5.2. It is noted that the contaminated site does not encompass any sediments on thebed of the lagoon, and is confined to the land based site as indicated in Figure 5.2.Further details of the current Environment Protection Authority (EPA) Notice for thiscontaminated lands site are contained in Appendix D. The Former Landfill site has beendeclared by the EPA as a remediation site under Section 21 of the Contaminated LandManagement Act 1997.The EPA has found that the site is contaminated with the substances listed in Table 5.3, andanalysis of sediment and water samples by both PBP (2003a) and Cardno (2009c) hasfound elevated levels of some of these contaminants in the lagoon.Table 5.3: Contaminants Present at the Former Landfill Site Adjacent to <strong>Manly</strong> <strong>Lagoon</strong> (After: EPA, 2004)ContaminantsAsbestosPolycyclic AromaticHydrocarbons (PAHs)Benzo(a)pyreneLeadCadmiumCopperZincPresence on the SitePieces of asbestos sheeting and loose asbestos fibres are present in soil,including in surface layers.Significantly elevated levels are present in soil, including in surface layers, atconcentrations exceeding the relevant health-based criteria for open spaceuse.In groundwater at concentrations exceeding criteria for the protection ofaquatic ecosystemsSignificantly elevated levels are present in soil, including in surface layers, atconcentrations exceeding the relevant health based criteria for open spaceuse.Significantly elevated levels are present in soil, including in surface layers, atconcentrations exceeding the relevant health based criteria for open spaceuse.Elevated levels are present in soil, including in surface layers.Significantly elevated levels are present in groundwater.Significantly elevated levels are present in groundwater.2 July 2010 Cardno (<strong>NSW</strong>/ACT) Pty Ltd 45H:\Doc\2010\Reports.2010\Rep2580v4.doc
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