The alternate control requirements for surface coating processes in the Beaumont-Port Arthur, Bexar County, Dallas-Fort Worth, El Paso, and Houston-Galveston-Brazoria areas and in Gregg, Nueces, and Victoria Counties are as follows.(1) Emission calculations for surface coating operations performed to satisfy the conditions of §101.23 of this title (relating to Alternate Emission Reduction ("Bubble") Policy), §115.910 of this title (relating to Availability of Alternate Means of Control), or other demonstrations of equivalency with the specified emission limits in this division must be based on the pounds of volatile organic compounds (VOC) per gallon of solids for all affected coatings. The owner or operator shall use the following equation to convert emission limits from pounds of VOC per gallon of coating to pounds of VOC per gallon of solids:Attached Graphic(2) Any alternate methods of demonstrating and documenting continuous compliance with the applicable control requirements or exemption criteria in this division, such as use of improved transfer efficiency, may be approved by the executive director in accordance with §115.910 of this title if emission reductions are demonstrated to be substantially equivalent.(3) If a vapor control system is used to control emissions from coating operations:(A) the capture and abatement system must be capable of achieving and maintaining emission reductions equivalent to the emission limitations of §115.421 of this title (relating to Emission Specifications) and an overall control efficiency of at least 80% of the VOC emissions from those coatings. The owner or operator shall use the following equation to determine the minimum overall control efficiency necessary to demonstrate equivalency with the emission limitations of §115.421 of this title:Attached Graphic(B) the owner or operator shall submit design data for each capture system and emission control device that is proposed for use to the executive director for approval. In the Beaumont-Port Arthur, Bexar County, Dallas-Fort Worth, El Paso, and Houston-Galveston-Brazoria areas, capture efficiency testing must be performed in accordance with §115.425(4) of this title (relating to Testing Requirements).(4) For any surface coating process or processes at a specific property, the executive director may approve requirements different from those in §115.421(8) of this title based upon his determination that such requirements will result in the lowest emission rate that is technologically and economically reasonable. When such a determination is made, the executive director shall specify the date or dates by which such different requirements must be met and shall specify any requirements to be met in the interim. If the emissions resulting from such different requirements equal or exceed 25 tons a year for a property, the determinations for that property must be reviewed every five years. Executive director approval does not necessarily constitute satisfaction of all federal requirements nor eliminate the need for approval by the United States Environmental Protection Agency in cases where specified criteria for determining equivalency have not been clearly identified in applicable sections of this chapter.