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(Phoenix canariensis) in total (including one in Lakeside Crescent) and one mature CabbageTree Palm (Livistona australis) likely planted in the 1930s.The secondary site access to Manly Lagoon via Riverview Parade may increase the numberof heavy vehicle movements and potential dust/exhaust pollution in this area may impact thestreet trees (heritage item) via an increase in airborne pollution. There is also the potentialfor passenger and utility vehicles accessing the site via Riverview Parade to damage thestreet trees via impact or collision.The two sites listed on the RNE (Manly Beach and Surrounds and Queenscliff Rock Pool)are proximal to the works site, but are not expected to be impacted upon by the proposedworks. Both of these heritage items could potentially be impacted upon by the proposedworks if mitigation measures such as the silt curtains fail. For example, during a significantlyhigh rainfall or flood event disturbed sediments may be carried downstream and out to theocean. However these events are considered unlikely. As the proposed works will improvethe water quality and ecological diversity of the lagoon it is anticipated that in the long termthe works will enhance the recreational and ecological values of Manly Beach andSurrounds.Mitigation MeasuresThe Street Trees on Riverview Parade will be identified to all staff contracted to undertakethe sediment removal and transport works so that any damage to these items is avoided. Ifdeemed necessary, appropriate protective fencing should be erected around the street treesin order to minimise the possibility of damage from machinery or heavy vehicles during theproposed works.The contractors and all staff undertaking the proposed works would need to be informed andmade aware of their responsibilities under the Heritage Act 1977 in the event of theidentification of a heritage item or relic.Should any item be encountered which is suspected to be a relic of heritage value, all worksthat may affect the item are to cease and the item is to be protected from damage ordisturbance. Manly and Warringah Councils should be notified immediately, and then anofficer from the NSW Heritage Office should be consulted on the course of action required.2 July 2010 Cardno (NSW/ACT) Pty Ltd 100H:\Doc\2010\Reports.2010\Rep2580v4.doc
Manly Lagoon Dredging Project – Review of Environmental FactorsPrepared for Manly and Warringah Councils5.6 Noise and VibrationExisting EnvironmentThe land surrounding the proposed works is predominately open space and low to mediumdensity residential areas, mainly comprised of single dwellings. Residences in closeproximity to the site are located primarily on Riverview Parade, in Warringah LGA, on theeastern foreshore of Manly Lagoon. Manly Golf Course is located on the south banks of theLagoon, opposite the end of Riverview Parade. There are also residences located on thewestern side of Addiscombe Road, proximal to the proposed works in Burnt Bridge Creek(Figure 1.2).On the western bank of Manly Lagoon there is a light industrial area, adjacent to MackellarGirls High School, located at the end of Campbell Parade, and adjacent to the proposeddredge area. Passmore and Nolan Reserves are located on the upper western and uppereastern banks, respectively, adjacent to the proposed dredge area (Figure 1.2).The primary existing background noise and vibration source at the proposed site is fromheavy traffic travelling north and southbound along Condamine Street/Pittwater Road(Metroad 10), which is the largest arterial road in the area, comprising of six lanes (threelanes bound in each direction). Metroad 10, which is a State Road, is located to the west ofthe works site. Pittwater Road (prior to its connection to Metroad 10) is also a six lanearterial road servicing the area, located to the north-east of the proposed works site. Othernoteworthy background noise includes traffic on local roads, such as Riverview Parade,Campbell Parade and Addiscombe Road, and from the light industrial area on CampbellParade.Impact AssessmentFor the proposed dredging works, noise and vibration is anticipated to have a short termimpact on surrounding residential receptors in the vicinity. Once works are complete noiseand vibration levels will revert to existing levels.NoiseWhen assessing the impact of noise generated by the proposed works, consideration of thefollowing factors is required:Existing land uses and ambient noise levels;Noise source level, mode of operation and duration of operation;Location of noise receptors in relation to works and the presence of noise softeningmeasures (e.g. barriers in the form of buildings or variations in topography) betweenthe source and receptor; andSensitivity of the receiving environment.The closest noise receptors to the dredging operations are residences located on RiverviewParade. There are approximately 28 residences located along Riverview Parade, adjacent to2 July 2010 Cardno (NSW/ACT) Pty Ltd 101H:\Doc\2010\Reports.2010\Rep2580v4.doc
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Manly Lagoon Dredging Project - Manly Council - NSW Government

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