R315-101-3. Principle of Non-degradation

(a) When closing or managing a contaminated site that has been stabilized in accordance with Section R315-101-2, the responsible party shall, to the extent practicable in accordance with Subsection R315-101-1(c), not allow the mass of contaminants in the source area to increase. Levels of contamination in groundwater, regardless of quality, shall not increase beyond the existing levels of contamination at a site when the responsible party has defined the nature and extent of contamination pursuant to Section R315-101-4. Consideration will be given to naturally occurring variations in groundwater contaminant concentrations, natural groundwater flow, and dispersion. (b) The responsible party shall demonstrate compliance with Subsection R315-101-3(a) by submitting appropriate sampling or other data as may be required by the director. (c) If at any time the level of contamination increases to a significant level, as determined by the director on a case-by-case basis, the responsible party shall take action, as determined by the director, such as source removal or source control, to prevent further degradation of groundwater. A work plan addressing interim action or other corrective action to mitigate the situation shall be submitted to the director for review and approval.