Manly Lagoon Dredging Project - Manly Council - NSW Government

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Manly Lagoon Dredging Project – Review of Environmental FactorsPrepared for Manly and Warringah CouncilsFigure 5.2: EPA Contaminated Land Site – Former Landfill, Adjacent to Manly Lagoon (After: ManlyCouncil GIS)Regarding how this EPA notice relates to other regulatory instruments (Section 4), thedeclaration does not affect the provisions of any relevant environmental planning2 July 2010 Cardno (NSW/ACT) Pty Ltd 46H:\Doc\2010\Reports.2010\Rep2580v4.doc
Manly Lagoon Dredging Project – Review of Environmental FactorsPrepared for Manly and Warringah Councilsinstruments which apply to the land or provisions of any other environmental protectionlegislation administered by the EPA.It must be noted that there are limitations to the DECCW Contaminated Land Record andother areas may be contaminated that are not on the record. Landfill and other activities thatoccurred in the vicinity of Manly Lagoon over the past century, as described in Section 2.4,may have resulted in contamination of lands. As such, potential contamination sites may beuncovered during the dredging works. However, it is important to note that the design of thedredging has sought to remove only those sediments that have accumulated in the lagoonsince 1992 (Section 2.5). Nonetheless, the prospect of encountering contaminated landneeds to be considered, particularly as depending on its quality, treated dredge spoil may bereused on parks and open spaces.PBP (2003a) undertook investigations into the chemical contaminants within Manly Lagoonfrom the areas to be dredged; from the footbridge at Nolan Reserve to the end of RiverviewParade. Lagoon sediment samples obtained via vibrocoring in December 2001 wereanalysed for a range of heavy metals, cyanide, fluoride, phenols, polycyclic aromatichydrocarbons (PAH), petroleum hydrocarbons (TPH), monocyclic aromatic hydrocarbons(MAH), organochlorine pesticides (OC pesticides) and polychlorinated biphenyls (PCB). Thefull results of the chemical analysis can be found in PBP (2002).Within the upper portion of dredging works, PBP reported that levels of zinc, lead, mercuryand copper were generally higher in the surface sediment than at depth. Higher levels ofcontamination were also recorded in the mid portion of works, adjacent to T.S. Condaminecompared with the upper portion of works. Levels of zinc exceeded ANZECC ISQG-Lowguideline levels at several sampling sites and exceeded ANZECC ISQG-High guidelines atone sampling site, adjacent to T.S. Condamine (PBP, 2003a). Levels of lead and mercurygenerally exceeded ANZECC ISQG-Low levels throughout the upper and mid portion ofworks, lead exceeded ANZECC ISQG-High levels in the mid portion of works, and elevatedlevels of hydrocarbons were recorded in the mid portion of works, adjacent to T.S.Condamine. Other contaminants (pesticides cyanide, fluoride, phenols, hydrocarbons etc)were generally below ANZECC guidelines (PBP, 2003a).PBP (2003a) suggested that the higher concentrations of contaminants in the sediments inthe vicinity of T.S. Condamine may be associated with the former use of the adjacent land asa tip (the Contaminated Former Landfill Site at the end of Addiscombe Road). It is knownthat elevated levels of PAHs, copper and zinc are contained in the groundwater leaving thecontaminated site (Table 5.3).PBP (2003a) also reported and observed elevated levels of contaminants at or near thesurface within the lagoon at the end of Riverview Parade; the lower portion of works. Inparticular, levels of lead and zinc exceeded ANZECC ISQG-High levels while levels ofmercury and copper exceeded ISQG-Low levels (PBP, 2002). Levels of PAHs andBenzo(a)pyrene in the lower portion of works, at the end of Riverview Parade also generallyexceeded ANZECC ISGC-Low levels (PBP, 2002). These contaminants could have possiblyoriginated from the EPA Contaminated Land Site immediately upstream of this area, which isknown to contain PAHs in groundwater from the site and Benzo(a)pyrene in soil and surface2 July 2010 Cardno (NSW/ACT) Pty Ltd 47H:\Doc\2010\Reports.2010\Rep2580v4.doc
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Manly Lagoon Dredging Project - Manly Council - NSW Government

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