Current through Register Vol. XLI, No. 50, December 13, 2024
Section 45-10-5 - Combustion of Refinery or Process Gas Streams5.1. No person shall cause, suffer, allow or permit the combustion of any refinery process gas stream or any other process gas stream that contains hydrogen sulfide in a concentration greater than 50 grains per 100 cubic feet of gas except in the case of a person operating in compliance with an emission control and mitigation plan approved by the Secretary and U. S. EPA. In certain cases very small units may be considered exempt from this requirement if, in the opinion of the Secretary, compliance would be economically unreasonable and if the contribution of the unit to the surrounding air quality could be considered negligible.5.2. Any owner or operator of a by-product coke production facility in existence on August 31, 2000 who can demonstrate to the Secretary that there is no practical alternative to scheduled maintenance (including shutdown) of desulfurization equipment may request the approval of an enforceable, temporary sulfur dioxide emissions control and mitigation plan for such maintenance period. In order for a plan under this subsection to be approved the plan must meet the following conditions: 5.2.1. Provide that all feasible control measures and process changes will be employed at the coke production facility to reduce emissions of sulfur dioxide (including reduction of coke oven gas generation) during the control system outage.5.2.2. Provide for a definitive reduction in sulfur dioxide emissions by the establishment of unit-specific allowable emission rates for all emissions units of the stationary source sufficient to prevent any violation of federal and state ambient air quality standards or applicable air quality increments for sulfur dioxide.5.2.3. Provide that system down-time and excess sulfur dioxide emissions be reduced to the greatest extent possible by use of increased or contract maintenance personnel, maximized maintenance labor shifts and optimization of available spare parts inventories.5.2.4. Provide for emissions and compliance monitoring as required by the Secretary in the approved plan during the maintenance periods and for the submission of reports of such monitoring and tests within time-frames specified by the Secretary in the approved plan. All approved plans shall require that a certified report of excess sulfur dioxide emissions from the by-product coke production facility and offsetting emission units be submitted to the Secretary within 30 days after the end of the maintenance period.5.2.5. Provide that no maintenance period exceed 14 days in length nor occur more than twice in any calendar year.5.2.6. Provide at least two weeks notice of all scheduled maintenance periods, the anticipated length of the maintenance period, work to be completed, measures to be taken to minimize the length of desulfurization system down-time and such other information as the Secretary may specify.5.2.7. Provide for annual review, if necessary, modification or termination of the plan by the Secretary.5.2.8. Provide that the Secretary may impose limitations on emission units that are more restrictive than those provided for in the plan as necessary to assure attainment of air quality standards for sulfur dioxide in light of data provided pursuant to subdivision 5.2.6, or any other information available to the Secretary.5.3. The Secretary shall, in making a determination concerning plan modification or termination, review the plant's compliance history and records to determine whether the plan has prevented or minimized, to the extent feasible, desulfurization system outages and excess emissions. The initial approval of the plan and any modification of the plan shall be accomplished as a revision to the State Implementation Plan.5.4. Compliance with the allowable hydrogen sulfide concentration limitations for combustion sources set forth in this rule shall be based on a block 3 hour averaging time.