Cal. Code Regs. tit. 23 § 3939.9
On March 4, 2004 the Los Angeles Regional Water Quality Control Board (Regional Board), adopted Resolution No. 2004-022 amending the Water Quality Control Plan for the Los Angeles Region (Basin Plan). The amendment revised the Basin Plan by updating the ammonia objectives for inland surface waters not characteristic of freshwater such that they are consistent with the U.S. EPA "Ambient Water Quality Criteria for Ammonia (Saltwater)-1989." The amendment revised the regulatory provisions of the Basin Plan by adding language to Chapter 3 "Water Quality Objectives."
For inland surface waters not characteristic of freshwater, the proposed objectives are a 4-day average concentration of un-ionized ammonia of 0.035 mg/L and a one-hour average concentration of un-ionized ammonia of 0.233 mg/L. The proposed objectives are fixed concentrations of un-ionized ammonia, independent of pH, temperature, or salinity. The proposed amendment includes an implementation procedure to convert un-ionized ammonia objectives to total ammonia effluent limits. The proposed amendment also simplifies the implementation procedures for translating ammonia objectives into effluent limits in situations where a mixing zone has been authorized by the Regional Board. Finally, the proposed amendment revises the implementation procedure for determining saltwater, brackish or freshwater conditions, to be consistent with the proposed objectives. The proposed objectives will apply only to inland surface waters not characteristic of freshwater (including enclosed bays, estuaries and wetlands) and do not impact the Ammonia Water Quality Objectives for ocean waters contained in the California Ocean Plan.
Cal. Code Regs. Tit. 23, § 3939.9