Sections 34A-6-1.7, 34A-6-1.9, and 34A-6-1.17 do not apply to existing facilities or to any new facility which handles less than twenty-five thousand tons per annum, unless required by federal law or regulation or unless the department can affirmatively demonstrate in a specific case that groundwater contamination is actually occurring.
SDCL 34A-6-1.18