LAC 33:III.2160. Procedures

A. Except as provided in Subsection C of this Section, the regulations at 40 CFR 51, appendix M, July 1, 2025, are hereby incorporated by reference. B. The volumes containing those federal regulations listed in Subsection A of this Section may be obtained from the Superintendent of Documents, United States Government Printing Office, Washington, DC 20402. C. Modifications and Exceptions. The following modifications and exceptions are made to the incorporated federal standards. 1. Method 204C, section 8.2.3.1. A sampling point shall be centrally located outside of the temporary total enclosure (TTE) at four equivalent diameters from each natural draft opening (NDO), if possible. 2. Other NDOs a. This step is optional. Determine the exhaust flow rate, including that of the control device, from the enclosure and the intake air flow rate. If the exhaust flow rate divided by the intake air flow rate is greater than 1.1, then all other NDOs are not considered to be significant exhaust points. b. If the option above is not taken, identify all other NDOs and other potential points through which fugitive emissions may escape the enclosure. Then use the following criteria to determine whether flow rates and VOC concentrations need to be measured. i. Using the appropriate flow direction indicator, determine the flow direction. An NDO with zero or inward flow is not an exhaust point. ii. Measure the outward volumetric flow rate from the remainder of the NDOs. If the collective flow rate is 2 percent, or less, of the flow rate from 40 CFR Part 51, Appendix M, Method 204E, Section 8.1.1, then these NDOs, except those within two equivalent diameters (based on NDO opening) from VOC sources, may be considered to be nonexhaust points. iii. If the percentage calculated in Clause C.2.b.ii of this Section is greater than 2 percent, those NDOs (except those within two equivalent diameters from VOC sources) whose volumetric flow rate totals 2 percent of the flow rate from 40 CFR Part 51, Appendix M, Method 204E, Section 8.1.1 may be considered as nonexhaust points. All remaining NDOs shall be measured for volumetric flow rate and VOC concentrations during the capture efficiency (CE) test. iv. The tester may choose to measure VOC concentrations at the forced exhaust points and the NDOs. If the total VOC emissions from the NDOs are less than 2 percent of the emissions from the forced draft and roof NDOs, then these NDOs may be eliminated from further consideration.