It would be an internal preview.
Internal previews are referred to be the kind of connectives that follow a transition and are generally used to inform the audience or readers about the primary issue that will be discussed next. Usually, the main claim is followed by a collection of supporting arguments.
Given that it is a brief statement that anticipates the next section of the speech ("the two types of solving the problem of groundwater contamination"), the given statement would be categorised as a "internal preview" type of connective.
It aids in keeping the discourse in order for better comprehension and in preparing the audience for the subsequent theme.
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