Manly Lagoon Dredging Project - Manly Council - NSW Government

Manly Lagoon Dredging Project – Review of Environmental FactorsPrepared for Manly and Warringah CouncilsAny disturbed areas on the lagoon banks should be remediated at the earliest possibleopportunity to minimise loss of soils from exposed areas via erosion. Further issues relatingto erosion and sedimentation are referred to in Section 5.1 and Section 5.3.Care with treated dredge spoil material during transportation and relocation for reuse ordisposal is required to prevent unnecessary dust pollution (e.g. covering loose materialshould any of the geobags become damaged), and the requirements should be specified inthe Dust Management Plan.Since the organic content of the dredge spoil is expected to be low, the potential for odourgeneration is considered to be low to medium. The contractor is required to prepare anOdour Management Plan as a contingency measure in the event that odours are generated.This is expected to include a communication strategy with potentially affected residents, anda range of potential mitigation measures including odour neutralisation, enclosing thegeobags, or relocation of the geobags.It is noted that the addition of lime to mitigate PASS risks is also expected to reduce the riskof odour generation.Regular, subjective monitoring of odour will be undertaken by the site superintendent or anindependent external person. This will consist of daily checks at three local receptorlocations, with the results of all observations being maintained in a log.Prior to the commencement of works, a complaints telephone line dedicated to taking callsfrom the public will be established, and will be advertised to local residents and by the use ofsite signage. These provisions will be advertised to the public via means of the CommunityConsultation Plan, which will be prepared by Manly and Warringah Councils.Overall, it is considered unlikely that the proposed works would have a significantenvironmental impact upon air quality and climate when the mitigation measures outlined inthis section are implemented.2 July 2010 Cardno (NSW/ACT) Pty Ltd 56H:\Doc\2010\Reports.2010\Rep2580v4.doc