Wat. Code, § 13246

(a) The state board shall act upon any water quality control plan not later than 60 days from the date the regional board submitted the plan to the state board, or 90 days from the date of resubmission of the plan.

(b) When the state board is acting upon a water quality control plan that is being amended solely for an action related to a regional board’s total maximum daily load submittal, not including submittals related to listing, the state board shall not exceed the 60-day timeline, inclusive of the time spent sending the submittal back to the regional board, unless one of the following circumstances exists:

(1) The proposed amendment is for an exceedingly complex total maximum daily load. In order to determine if a total maximum daily load is exceedingly complex, the state board may consider a number of factors including, but not limited to, the volume of the record, the number of pollutants included, the number of dischargers and land uses involved, and the size of the watershed. The reason or reasons that any total maximum daily load is determined to be exceedingly complex shall be provided by the state board to the regional board in writing.

(2) The submittal by the regional board is clearly incomplete.