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Oklahoma Administrative Code (Last Updated: March 11, 2021) |
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TITLE 252. Department of Environmental Quality |
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Chapter 515. Management of Solid Waste |
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Subchapter 9. Groundwater Monitoring/Corrective Action |
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Part 9. ASSESSMENT MONITORING |
SECTION 252:515-9-96. Groundwater protection standard
Latest version.
- (a) MCL established. The maximum contaminant level (MCL) promulgated under the Safe Drinking Water Act shall be the groundwater protection standard for each Appendix A and C constituent detected in the groundwater.(b) MCL not established. If MCL has not been established under the Safe Drinking Water Act for a particular constituent, the background level of the constituent shall be the groundwater protection standard.(c) Background above MCL. If background level of a particular constituent is above the established MCL, or appropriate health-based levels if no MCL has been established, the background level shall be the groundwater protection standard.(1) Published health-based level. For the purposes of this Subsection, the health-based level is a concentration that would result in an increased risk no of greater than 1 x 10-5 for carcinogens or a Hazard Index of < 1 for non-carcinogens as calculated by procedures specified in EPA 540/R-95/128, Methods for Estimation of Contaminants in Groundwater That Can Migrate to a Receptor Point.(2) Health-based level not listed. The DEQ shall be consulted if a health-based level is not listed for a particular constituent.