PURPOSE: This rule restricts the emission of particulate matter from fuel burning equipment used for indirect heating except where 10 CSR 10-6.070 would be applied.

1. (1) Application. This rule shall apply throughout Missouri except in the City of St. Louis and St. Charles, St. Louis, Jefferson, Franklin, Clay, Cass, Buchanan, Ray, Jackson, Platte and Greene Counties.
2. (2) Definitions of terms specified in this rule may be found in 10 CSR 10-6.020.

3. (3) General Provisions.

   1. (A) This rule applies to installations in which fuel is burned for the primary purpose of producing steam, hot water or hot air or other indirect heating of liquids, gases or solids and in the course of doing so, the products of combustion do not come into direct contact with process materials. Fuels may include for example coal, coke, lignite, coke breeze, gas, fuel oil and wood, but do not include refuse. When any products or byproducts of a manufacturing process are burned for the same purpose or in conjunction with any fuel, the same maximum emission limitations shall apply.
   2. (B) The heat content of solid fuels shall be determined as specified in 10 CSR 10- 6.040(2). The heat content of liquid hydrocarbon fuels shall be determined as specified in 10 CSR 10-6.040(3).
   3. (C) For purposes of this rule, the heat input shall be the aggregate heat content of all fuels whose products of combustion pass through a stack(s). The heat input value used shall be the equipment manufacturer’s or designer’s guaranteed maximum input, whichever is greater, except in the case of boilers of ten (10) million British thermal units (Btu) or less the heat input can also be determined by the higher heating value

4. (HHV) of the fuel used at maximum operating conditions. The total heat input of all fuel burning units at a plant or on a premises shall be used for determining the maximum allowable amount of particulate matter which may be emitted.

   1. (D) The amount of particulate matter emitted shall be determined as specified in 10 CSR 10-6.030(5). Any other method which is in accordance with good professional practice may be used with the consent of the staff director.
   2. (E) This rule shall not apply to indirect heating sources subject to the provisions of 10 CSR 10-6.070. However, indirect heat input values from sources that are subject to New Source Performance Standards shall be used in the calculation of Q (the installation’s total heat input).
   3. (F) Indirect heating sources requiring permits under 10 CSR 10-6.060 that in turn may require particular air pollution control measures to meet more stringent emission limitations than in this rule shall meet the requirements of 10 CSR 10-6.060 Permits Required.

5. (4) Emission Limitations for Existing Indirect Heating Sources.

   1. (A) No person may cause, allow or permit the emission of particulate matter from existing indirect heating sources in excess of that specified in the following schedule:

      1. 1. If the total equipment heat input has a

capacity rating of ten (10) million Btu or less, 0.60 pounds for each million Btu per hour input; or

1. 2. If the total equipment heat input has a

capacity rating of ten thousand (10,000) million Btu or more, 0.18 pounds for each million Btu per hour input.

1. (B) The amount of particulate matter which may be emitted from fuel burning equipment having an intermediate capacity rating between ten (10) million and ten thousand (10,000) million Btu shall be determined by use of the following equation:

   E = 0.90(Q)-0.174

where E = the maximum allowable particulate emission rate in pounds per million Btu of heat input, rounded off to two

1. (2) decimal places; and

Q = the installation heat input in millions of Btu per hour.

1. (5) Emission Limitation for New Indirect Heating Sources.

   1. (A) No person may cause, allow or permit the emission of particulate matter in excess of that specified in the following schedule:

      1. 1. If the total equipment heat input has a

capacity rating of ten (10) million Btu or less, 0.60 pounds for each million Btu per hour input; or

1. 2. If the total equipment heat input has a

capacity rating of two thousand (2,000) million Btu or more, 0.10 pounds for each million Btu per hour input.

1. (B) The amount of particulate matter which may be emitted from fuel burning equipment having an intermediate capacity rating between ten (10) million and two thousand (2,000) million Btu shall be determined by use of the following equation:

   E = 1.31(Q)-0.338

where E = the maximum allowable particulate emission rate in pounds per million Btu of heat input, rounded off to two

1. (2) decimal places; and

Q = the installation heat input in millions of Btu per hour.

1. (6) Compliance Schedule for Existing Sources. Existing burning equipment used for indirect heating shall be modified or rebuilt in compliance with section (4) in accordance with the following schedule: rated capacity—ten thousand (10,000) million or greater Btu heat input per hour; latest date for compliance; January 1, 1972; and rated capacity—ten (10) million to nine thousand nine hundred ninetynine (9,999) million Btu heat input per hour; latest date for compliance, January 1, 1973.

AUTHORITY: section 643.050, RSMo 1986.* Original rule filed March 24, 1971, effective April 3, 1971. Amended: Filed Jan. 31, 1972, effective Feb. 10, 1972. Amended: Filed June 30, 1975, effective July 10, 1975. Amended: Filed Aug. 16, 1977, effective Feb. 11, 1978. Amended: Filed March 15, 1979, effective Nov. 11, 1979. Amended: Filed Oct. 13, 1983, effective March 12, 1984. Amended: Filed March 14, 1984, effective Sept. 14, 1984. Amended: Filed April 1, 2002, effective Nov. 30, 2002. *Original authority: 643.050, RSMo 1965, amended 1972, 1992.