| (B) The storage tank, transport vessel, or marine vessel can be vented to the atmosphere without control for the remainder of the degassing operation and no further VOC measurements are required if the VOC concentration inside the tank or vessel is less than 6,800 ppmv expressed as methane or 10% of the LEL before the owner or operator stops routing the VOC vapors to a control device in accordance with §115.541 of this title (relating to Emission Specifications) and §115.542 of this title. (5) Minor modifications to the monitoring methods specified in this section may be approved by the executive director. Monitoring methods other than those specified in this section may be used if approved by the executive director and validated by 40 CFR Part 63, Appendix A, Method 301. (6) The sampling location for monitoring the VOC concentration as required by subsection (b)(3) of this section should be immediately before the control device or in the transfer line connecting from the tank or vessel to the control device. The owner or operator may elect to monitor the VOC concentration at a location inside the vapor space of the tank or vessel provided the location is representative of the VOC concentration entering the control device. (c) Testing requirements. The following testing requirements apply to the owner or operator of any storage tank, transport vessel, or marine vessel subject to the requirements in this division if a control device is used to comply with the emission specifications in §115.541 of this title. (1) For a control device used to comply with the requirements in §115.542(a)(1) of this title, an initial control efficiency demonstration must be conducted in accordance with the approved test methods in §115.545 of this title (relating to Approved Test Methods) and the device must be retested after any modification that could reasonably be expected to decrease the efficiency of a control device within 60 days after the modification or before being used to comply with the requirements in §115.542(a)(1) of this title, whichever is longer. (2) For a portable control device used to comply with the requirements in §115.542(a)(1) of this title, a periodic control efficiency demonstration must be conducted at least once every 60 months in accordance with the approved test methods in §115.545 of this title. (3) For a portable thermal oxidizer or vapor combustor used to comply with the requirements in §115.542(a)(1) of this title, the periodic control efficiency demonstration in paragraph (2) of this subsection will not be required if the combustion chamber temperature is at least 1,400 degrees Fahrenheit and the flow rate of the VOC vapors routed to the device is limited to assure at least a 0.5 second combustion chamber residence time at all times when the device is in use. |
| Source Note: The provisions of this §115.544 adopted to be effective December 3, 1993, 18 TexReg 8538; amended to be effective May 27, 1994, 19 TexReg 3703; amended to be effective June 14, 2007, 32 TexReg 3178; amended to be effective February 17, 2011, 36 TexReg 807 |
