(a) It is the purpose of this article to provide additional and cumulative remedies to address the quality of the groundwater of the state. This article does not alter the authority of any agency with respect to water other than groundwater. Except as expressly stated in this article, it is not the intention of the Legislature in enacting this article to repeal any other provision of this code.
(b) Nothing contained in this article abridges or alters rights of action or remedies now or hereafter existing, nor do any provisions in this article, or any act done by virtue of this article, estop the state, municipalities, public health officers or persons as riparian owners or otherwise, in the exercise of their rights to suppress nuisances or to abate any pollution now or hereafter existing, or to recover damages.
(c) Where a person is operating a source or conducting an activity in compliance with the terms and conditions of a permit, rule, order, directive or other authorization issued by a groundwater regulatory agency pursuant to this article, such person is not subject to criminal prosecution for pollution recognized and authorized by such permit, rule, order, directive or other authorization.