1. (1) Applicability. This regulation applies to facilities that handle natural gas or refinery gas that contains more than 0.10 grain of hydrogen sulfide per standard cubic foot (SCF).
2. (2) No person shall cause or permit the emission of a process gas stream containing more than 0.10 grain of hydrogen sulfide per SCF into the atmosphere unless it is properly burned to maintain the ground level concentrations of hydrogen sulfide to less than twenty (20) parts per billion beyond plant property limits, averaged over a thirty (30) minute period.

3. (3) No person shall cause or permit the sulfur oxide emission from any facility designed to dispose of or process natural gas or refinery gas containing more than 0.10 grain of hydrogen sulfide per standard cubic foot to exceed the following:

   1. (a) The allowable emissions of sulfur dioxide are increased as follows to allow for dry acid gas streams containing less than 60 percent hydrogen sulfide:

      Mole Percent of Hydrogen Sulfide In Dry Acid Gas	Additional SO2 Emissions Allowed
      50% but less than 60%	0.02 lbs. SO2/lb. S processed
      40% but less than 50%	0.04 lbs. SO2/lb. S processed
      30% but less than 40%	0.06 lbs. SO2/lb. S processed
      20% but less than 30%	0.10 lbs. SO2/lb. S processed
      Less than 20%	Must utilize the best available control technology, with consideration to the technical practicability and economic reasonableness of reducing or eliminating the emissions from the facility.

   Category I Counties

   Available Sulfer (Long Tons/Day)	Permitted Emissions of Sulfur Dioxide
   Up to 5	No Limit
   5 to 35	373 lbs/hour
   35 to 75	0.10 lbs. SO2/lb. S processed
   Over 75	0.08 lbs. SO2/lb. S processed

   Category II Counties

   Available Sulfer (Long Tons/Day)	Permitted Emissions of Sulfur Dioxide
   Up to 10	No Limit
   10 to 50	560 lbs/hour
   50 to 100	0.10 lbs. SO2/lb. S processed
   Over 100	0.08 lbs. SO2/lb. S processed

4. (4) Applicability. In addition to the requirements of paragraph (3) of this Rule, the provisions of this paragraph apply to all natural gas processing facilities in Escambia County with capacities greater than 50 million standard cubic feet of sour gas per day.

   1. (a) No person shall cause or permit the emissions of total sulfur compounds, measured as sulfur dioxide, from any affected facility to exceed the following:

      Available Sulfer (Long Tons/Day)	Permitted Emissions of Sulfur Dioxide
      Up to 575	0.140 pounds of total sulphur compounds per pound of available sulfur
      575 to 1031	Pounds of total sulfur compounds per pound of available sulfur = 0.186 - 8.57 x 10^-7S Where S = lb/hr of available sulfur
      Over 1031	10,008 lb/hr

   2. (b) Compliance with subparagraph (a) of this paragraph shall be determined continuously by monitors which measure the total sulfur compounds, measured as sulfur dioxide, emitted by the facility and total available sulfur to the facility or by other equivalent methods approved by the Director.
5. (5) For purposes of this Rule, the following counties are classified as Category I Counties: Jackson, Jefferson, and Mobile. The remaining counties in the state are classified as Category II Counties.
6. (6) Compliance with this Rule shall be determined by both material balances and stack sampling. New plants are required either to install monitors to continuously determine the sulfur oxide emissions in terms of mass per unit of time or to determine the sulfur oxide emissions by other means approved by the Director.
7. (7) In calculating the ground level concentration that results from short-term waste gas or emergency flaring, it shall be assumed that only seventy-five percent (75%) of the heat of combustion is used to heat the products of combustion.
8. (8) Air Quality Demonstration. In addition to the requirements of paragraph (3) of this Rule, every owner or operator of a facility covered by Rule 335-3-5-.03 shall demonstrate, to the satisfaction of the Director, that the sulfur oxides emitted, either along or in conjunction with other sources, will not interfere with attainment and maintenance of any primary or secondary ambient air quality standard.
9. (9) To ensure that ambient air quality standards are met, an annual review of Sulfur Dioxide Category I and II Counties will be made by the staff. Initial Sulfur Dioxide Category Classifications and any subsequent changes to Sulfur Dioxide Category Classifications will be the subject of a public hearing.

Author: James W. Cooper, John E. Daniel

Statutory Authority: Code of Ala. 1975, §§22-28-14, 22-22A-5, 22-22A-6, 22-22A-8.

History: Effective Date: January 18, 1972. Amended: May 29, 1973; May 25, 1976; August 10, 1987. Amended: Filed October 17, 1996; effective November 21, 1996. Amended: Filed August 3, 2000; effective September 7, 2000.