(c) Prior to revising the best available control technology guideline for a source category to establish an emission limit that is more stringent than the existing best available control technology guideline for that source category, the south coast district shall do all of the following:

1. (1) Identify one or more potential control alternatives that may constitute the best available control technology, as defined in Section 40405.
2. (2) Determine that the proposed emission limitation has been met by production equipment, control equipment, or a process that is commercially available for sale, and has achieved the best available control technology in practice on a comparable commercial operation for at least one year, or a period longer than one year if a longer period is reasonably necessary to demonstrate the operating and maintenance reliability, and costs, for an operating cycle of the production or control equipment or process.
3. (3) Review the information developed to assess the cost-effectiveness of each potential control alternative. For purposes of this paragraph, “cost-effectiveness” means the annual cost, in dollars, of the control alternative, divided by the annual emission reduction potential, in tons, of the control alternative.
4. (4) Calculate the incremental cost-effectiveness for each potential control option. To determine the incremental cost-effectiveness under this paragraph, the district shall calculate the difference in the annual dollar costs, divided by the difference in the annual emission reduction between each progressively more stringent control alternative, as compared either to the next less expensive control alternative, or to the current best available control technology, whichever is applicable.
5. (5) Place the best available control technology revision for a source category proposed under this subdivision on the calendar of a regular meeting agenda of the south coast district board, for its acceptance or further action, as the board determines.