Okla. Admin. Code § 252:606-6-84 – Criteria long-term averages for the implementation of mineral constituent criteria to protect the Agriculture beneficial use

(a) LTA_YMS. LTA_YMS = WLA_YMS. See Equation N-3.
(b) LTA_SS. LTA_SS is calculated using a 99% probability basis according to Equation N-4. A CV value of 0.6 is assumed in determining LTA_SS unless a CV was determined from effluent data in accordance with OAC 252:606-6-7.
(c) Limiting LTAs. LTA_YMS and LTA_SS are compared with each other for each mineral constituent, and the more stringent of the two LTAs is the limiting LTA for that mineral constituent, as described in Equations N-5, N-6, and N-7.

Added at 41 Ok Reg, Number 23, effective 9-15-24