Okla. Admin. Code § 252:730-5-7
As needed, site-specific criteria may be developed to reflect site-specific waterbody conditions. Site-specific criteria must be based on sound scientific rationale and assure protection of beneficial uses. Site-specific criteria are developed on a case-by-case basis and depending on the particular case there may be various acceptable scientific approaches for developing site-specific criteria. However, in all cases prior to initiating development of a site-specific criteria, a detailed workplan consistent with DEQ or EPA technical guidance, if available, shall be submitted for review and approval by DEQ's Water Quality Division. Prior to the initiation of any work toward development of a site-specific criterion, interested parties shall coordinate with DEQ technical staff. Additional information and site-specific criteria adopted for certain waterbodies and conditions are found in Appendix E.
Okla. Admin. Code § 252:730-5-7