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swChemicalAssessmentYear - Required.

Provide the year on which the assessment of status is based. This may be the year that the surface water body was monitored. In case of grouping this may be the year in which monitoring took place in the surface water bodies within a group that are used to extrapolate results to non-monitored surface water bodies within the same group. A period is possible (e.g. 2011--2013).