Oklahoma Administrative Code › Title 785 - Oklahoma Water Resources Board › Chapter 46 - Implementation of Oklahoma's Water Quality Standards › Subchapter 15 - Use Support Assessment Protocols › Section 785:46-15-8 - Assessment of Agriculture support

Current through Vol. 41, No. 20, July 1, 2024
(a)
Scope.
The provisions of this
										Section shall be used to determine whether the beneficial use of Agriculture designated in OAC 785:45 for a
										waterbody is supported.
(b)
General support tests for
										chlorides, sulfates and TDS.
(1) The Agriculture beneficial use
										designated for a waterbody shall be deemed to be fully supported with respect to chloride if the mean of all
										chloride sample concentrations from that waterbody do not exceed the yearly mean standard prescribed in
										Appendix F or site specific criteria promulgated in Appendix E of OAC 785:45 and no more than 10% of the
										sample concentrations from that waterbody exceed the sample standard prescribed in Appendix F or site
										specific criteria promulgated in Appendix E of OAC 785:45.
(2)
										The Agriculture beneficial use designated for a waterbody shall be deemed to be not supported with respect to
										chloride if the mean of all chloride sample concentrations from that waterbody exceeds the yearly mean
										standard prescribed in Appendix F or site specific criteria promulgated in Appendix E of OAC 785:45, or
										greater than 10% of the sample concentrations from that waterbody exceed the sample standard prescribed in
										Appendix F or site specific criteria promulgated in Appendix E of OAC 785:45. Provided, if the chloride
										sample concentrations are each less than 250 mg/L, then the Agriculture beneficial use shall be deemed to be
										fully supported with respect to chloride.
(3) The Agriculture
										beneficial use designated for a waterbody shall be deemed to be fully supported with respect to sulfate if
										the mean of all sulfate sample concentrations from that waterbody do not exceed the yearly mean standard
										prescribed in Appendix F or site specific criteria promulgated in Appendix E of OAC 785:45 and no more than
										10% of the sample concentrations from that waterbody exceed the sample standard prescribed in Appendix F or
										site specific criteria promulgated in Appendix E of OAC 785:45.
(4) The Agriculture beneficial use designated for a waterbody shall be
										deemed to be not supported with respect to sulfate if the mean of all sulfate sample concentrations from that
										waterbody exceeds the yearly mean standard prescribed in Appendix F or site specific criteria promulgated in
										Appendix E of OAC 785:45, or greater than 10% of the sample concentrations from that waterbody exceed the
										sample standard prescribed in Appendix F or site specific criteria promulgated in Appendix E of OAC 785:45.
										Provided, if the sulfate sample concentrations are each less than 250 mg/L, then the Agriculture beneficial
										use shall be deemed to be fully supported with respect to sulfate.
(5) The Agriculture beneficial use designated for a waterbody shall be
										deemed to be fully supported with respect to TDS if the mean of all TDS sample concentrations from that
										waterbody do not exceed the yearly mean standard prescribed in Appendix F or site specific criteria
										promulgated in Appendix E of OAC 785:45 and no more than 10% of the sample concentrations from that waterbody
										exceed the sample standard prescribed in Appendix F or site specific criteria promulgated in Appendix E of
										OAC 785:45.
(6) The Agriculture beneficial use designated for a
										waterbody shall be deemed to be not supported with respect to TDS if the mean of all TDS sample
										concentrations from that waterbody exceeds the yearly mean standard prescribed in Appendix F or site specific
										criteria promulgated in Appendix E of OAC 785:45, or greater than 10% of the sample concentrations from that
										waterbody exceed the sample standard prescribed in Appendix F or site specific criteria promulgated in
										Appendix E of OAC 785:45. Provided, if the TDS sample concentrations are each less than 700 mg/L, then the
										Agriculture beneficial use shall be deemed to be fully supported with respect to TDS.