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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 690. Water Quality Standards Implementation |
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Subchapter 3. Point Source Discharges |
SECTION 252:690-3-16. Requirements specific to agriculture criteria
Latest version.
- (a) Historical data. If site-specific background defensible analytical data is not available, the DEQ will use the YMS and SS criteria in OAC 785:45, Appendix F, to determine the background concentrations of the mineral constituents. In the absence of listed YMS and SS criteria specific to the receiving water of interest, the segment averaged YMS and SS criteria are used to establish the background concentrations of the mineral constituents. CB is calculated according to Equation C-11 in Appendix C.(b) Site-specific background data available. Where a site specific background data set of at least 10 data points is available, the DEQ may use the arithmetic average of the site specific background data set instead of a background level determined from the segment-averaged YMS and SS values in OAC 785:45, Appendix F.(c) Background monitoring. Where agriculture criteria-based limitations are established in a permit, the DEQ may require background monitoring of the limited mineral constituent(s) to determine site-specific conditions.