13.2 The Wallis Lake Estuary Management Committee - Great Lakes ...

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Wallis Lake Estuary Management Plan Strategy/Outcome Actions Monitoring and performance indicator Data interpretation Target Comments Progress Minimise point source chemical pollutant inputs to the Wallis Lake estuary NSW Food Authority conducts shellfish testing for pesticides and metals on an annual basis in the island/entrance area of the lake. Time series analysis of data. TBD W.3.1, W.3.2, W.3.3, W.3.4 Review of this program should analyse trends in the pesticide and metal concentrations of shellfish and set realistic targets for reducing the input of these pollutants. Strategy/Outcome Actions Monitoring and performance indicator Data interpretation Target Comments Progress Reduce the leaching of ASS products to the Wallis Lake estuary W.4.1, W.4.2, W.4.3 Compliance rates with ASS provisions of LEPs, DCPs and other relevant Environmental Planning Instruments. GLC SoE reporting. 100% DCP to be gazetted Rehabilitate Darawakh/Frogalla Swamp wetland to reduce acid products entering the Wallamba River W.4.1 Follow up survey of fish and aquatic invertebrates of Darawakh Creek (see Curlew Biological Services, 2000). Comparison of before and after rehabilitation data for abundances and biodiversity of fish and aquatic invertebrates. TBD Review of this program should analyse the fish and aquatic invertebrate survey conducted prior to rehabilitation and set realistic targets for increased abundances and biodiversity of organisms. Water sampling (pH in particular) in Darawakh Creek could be used by GLC as a more regular, inexpensive assessment of rehabilitation. 102
Wallis Lake Estuary Management Plan Strategy/Outcome Actions Monitoring and performance indicator Data interpretation Target Comments Progress Reduce the risk of septic W.5.1 Compliance rates from inspections conducted GLC SoE reporting. 100% waste from entering the under the Septic√Safe program. Wallis Lake estuary W.5.2 Results of MidCoastWater stormwater monitoring at Coomba Park (see comment for Strategy W.5). TBD TBD Monitoring was developed and coordinated by MidCoastWater. Review of this Sampling has begun. W.10.1, W.10.3 NSW Food Authority conducts monthly water sampling for faecal coliforms in the island/entrance area of the lake (Fig. 4.4). Time series analysis of data. TBD program should Faecal coliform data is an indication of effluent contamination. However, it is not specific to human effluent. To complement this data water should be sampled for faecal sterols, which specifically indicate human effluent. This additional sampling should include sites outside of the island/entrance area. 103
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