1. The Department shall classify the chemical status of surface water bodies in accordance with the following steps:
(a)Estimate from monitoring or modelling results the concentrations in the surface water body of appropriate priority substances and other dangerous substances listed in Schedule 1 of these Regulations. The appropriate substances shall include those likely to be in the surface water body in quantities that could cause a failure of the corresponding environmental quality standard.
(b)Compare the values of the appropriate substances estimated from monitoring or modelling with the applicable standards in Schedule 1.
(c)Classify the chemical status of the surface water body as good unless the standard for one or more priority substances or other dangerous substances is failed. If one or more is failed, classify as failing to achieve good chemical status.