Subclause (3) provides that if an objective is not specified in this Policy, for the protection of aquaculture and the human consumption of aquatic foods, the objective specified for the protection of aquatic ecosystems becomes the objective to be applied. Subclause (4) provides that where multiple beneficial uses overlap in a water environment, and where different objectives for a particular indicator exist, the most protective limit applies. This ensures that all beneficial uses in an area are protected. 5. Weight of evidence objectives (1) To protect aquatic ecosystems, the objectives for sediment toxicity in rivers and streams, wetlands, estuaries and marine waters in Table 12 is for a low risk of adverse outcomes as set out in 1 low column of that Table. ‘Ranking – risk’ (2) For the purposes of Sediment and / or in Table 12, the values identified ‘Toxicity: Water’ are: (a) default effect size values and need to be significantly different to the control. (b) smaller effect sizes may be used when multiple references sites and a synthetic sediment control is used. (3) For the purposes of of evidence in Table 12, further information on ‘Weight assessment’ calculations for the weight-of-evidence approach will be provided in guidance developed by the Authority. Explanatory Notes: Weight of evidence objectives have been set to protect water dependent ecosystems and species in rivers and streams, wetlands, estuaries and marine waters. These objectives are intended to guide water managers and the Authority on the impairment of aquatic ecosystem beneficial uses in ambient waters from toxicants. The assessment of sediment and water toxicity indicators is based on a assessment.
Subclause (3) provides that if an objective is not specified in this Policy, for the protection of aquaculture and the human consumption of aquatic foods, the objective specified for the protection of aquatic ecosystems becomes the objective to be applied. Subclause (4) provides that where multiple beneficial uses overlap in a water environment, and where different objectives for a particular indicator exist, the most protective limit applies. This ensures that all beneficial uses in an area are protected. 5. Weight of evidence objectives (1) To protect aquatic ecosystems, the objectives for sediment toxicity in rivers and streams, wetlands, estuaries and marine waters in Table 12 is for a low risk of adverse outcomes as set out in ‘Ranking 1 – low risk’ column of that Table. (2) For the purposes of ‘Toxicity: Sediment and / or Water’ in Table 12, the values identified are: (a) default effect size values and need to be significantly different to the control. (b) smaller effect sizes may be used when multiple references sites and a synthetic sediment control is used. (3) For the purposes of ‘Weight of evidence assessment’ in Table 12, further information on calculations for the weight-of-evidence approach will be provided in guidance developed by the Authority. Explanatory Notes: Weight of evidence objectives have been set to protect water dependent ecosystems and species in rivers and streams, wetlands, estuaries and marine waters. These objectives are intended to guide water managers and the Authority on the impairment of aquatic ecosystem beneficial uses in ambient waters from toxicants. The assessment of sediment and water toxicity indicators is based on a assessment.