PURPOSE: This regulation establishes emission limits for batchtype charcoal kilns based on operational parameters that reflect the Best Available Control Technology (BACT) for this industry as of August 20, 1997.

1. (1) Applicability.

   1. (A) This regulation applies to all batch-type charcoal kilns throughout the entire state of Missouri.
   2. (B) In the event that other rules in the Code of State Regulations are also applicable to batch-type charcoal kilns, the more stringent rule requirement applies.

2. (2) Definitions.

   1. (A) Batch-type charcoal kiln—Charcoal kilns that manufacture charcoal with a batch process rather than a continuous process. The batch-type charcoal kiln process typically includes loading wood, sealing the kiln, igniting the wood, and controlled burning of the wood to produce charcoal which is unloaded.
   2. (B) Burn cycle—The burn cycle for a charcoal kiln begins at the time that a batch of wood is initially lit and ends when the burn for that batch is completed and the kiln is sealed. The burn cycle does not include cool down time.
   3. (C) Charcoal kiln—Any closed structure used to produce charcoal by controlled burning (pyrolysis) of wood. Retorts and furnaces used for charcoal production are not charcoal kilns.
   4. (D) Charcoal kiln control system—A combination of an emission control device and connected charcoal kiln(s).
   5. (E) Emission control device—Any device used to reduce contaminant emissions into the air. Thermal oxidizers or afterburners are often used on charcoal kilns for burning exhaust gases to reduce particulate matter, carbon monoxide, and volatile organic compound emissions.
   6. (F) Fill capacity—The maximum amount of wood that can be properly loaded into a charcoal kiln prior to the burn cycle.
   7. (G) Installation—All source operations including activities that result in fugitive emissions, that belong to the same industrial grouping (that have the same two (2)-digit code as described in the Standard Industrial Classification Manual, 1987), and any marine vessels while docked at the installation, located on one (1) or more contiguous or adjacent properties and under the control of the same person (or persons under common control).
   8. (H) Opacity—The extent to which airborne material obstructs the transmission of incident light and obscures the visual background. Opacity is stated as a percentage of light obstructed and can be measured by a continuous opacity monitoring system or a trained observer. An opacity of one hundred percent (100%) represents a condition in which no light is transmitted and the background is completely obscured.
   9. (I) Particulate matter—Particulate matter emissions from charcoal kilns and charcoal kiln control systems consists of all particulate matter including condensables.
   10. (J) Residence time—Period of time in which gas in a thermal oxidizer, incinerator, or afterburner is exposed to heat and oxygen at a specified temperature in order to destroy pollutants present in the gas.
   11. (K) Treated wood—Wood that has been subjected to a chemical process or application.
   12. (L) Volatile organic compounds (VOCs)—See definition in 10 CSR 10-6.020.

3. (3) General Provisions.

   1. (A) Restriction of Emissions.

      1. 1. No charcoal kiln control system shall emit visible

emissions greater than ten percent (10%) opacity.

1. 2. No charcoal kiln control system shall emit more than the

following emissions:

1. A. 1.5 pounds per hour of particulate matter;
2. B. Either 0.24 pounds per hour volatile organic

compounds (VOCs) or the emission rate equivalent to ninetynine percent (99%) VOC control efficiency, whichever results in a lower emission rate; and

1. C. 1.75 pounds per hour of carbon monoxide (CO).
2. 3. Charcoal kiln control systems shall be maintained to

assure that no visible fugitive emissions result from equipment cracks or door seals.

1. (B) Operating Requirements.

   1. 1. No charcoal kiln shall be operated without an emission

control device installed and operated to meet the requirements of this rule and other applicable state and federal rules.

1. 2. Each emission control device shall have a sight glass or

other viewing portal installed in the burning chamber such that the burn can be visually monitored.

1. 3. All charcoal kiln emissions shall be ducted to an

operating emission control device throughout the entire burn cycle.

1. 4. Emission control devices shall be equipped with

automatic temperature control systems which are set such that gas streams are heated and maintained according to one (1) of the following sets of conditions:

1. A. At a nominal operating temperature of sixteen

hundred degrees Fahrenheit (1600 °F), with a fifteen hundred twenty degree Fahrenheit (1520 °F) minimum temperature allowed, for a minimum residence time of 1.7 seconds; or

1. B. At an alternative operating temperature and residence

time determined by performance testing, during which the following conditions are met:

1. (I) All emission limit requirements of paragraphs (3)

(A)1. and 2. of this rule are met;

1. (II) The CO control efficiency is greater than or equal

to ninety-nine percent (99%); and

1. (III) The department has validated the performance

test results that the alternative operating temperature and residence time are based on. The operating requirements in subparagraph (3)(B)4.A. of this rule apply until these performance test results have been validated.

1. 5. All charcoal kiln control systems shall be operated using

the same fuel(s) as used during performance testing.

1. 6. No charcoal kiln shall burn treated wood at any time.
2. 7. Rule 10 CSR 10-6.050 Start-up, Shutdown, and Malfunction

Conditions shall only be applicable to charcoal kiln control systems with regard to the malfunction provision, and not with regard to start-up and shutdown.

1. 8. All charcoal kiln control systems shall be operated and

maintained in accordance with the department approved standard operating procedures manual described in subsection (3)(D) of this rule and the department approved maintenance practices manual described in subsection (3)(E) of this rule.

1. 9. All charcoal kiln control systems that have been

performance tested shall continuously display and record the emission control device operating temperature with the permanently installed temperature recording device at all times of operation.

1. (C) Each charcoal kiln shall have a unique identification number permanently affixed to the exterior of the charcoal kiln structure.

2. (D) The owner or operator of charcoal kilns at charcoal manufacturing installations shall develop, submit for department approval, and establish a standard operating procedures manual for each charcoal manufacturing installation. At a minimum, this manual shall describe—

   1. 1. Safe charcoal kiln operation;
   2. 2. Bundle stacking (including adequate platform of logs to

enhance combustion);

1. 3. Use of properly seasoned wood (cover mixing of wood

species, if applicable);

1. 4. Control of fugitive emissions from each charcoal kiln

(e.g. “mudding” cracks and doors) and each emission control device; and

1. 5. Methods of reporting and recordkeeping under section

1. (4) of this rule.

   1. (E) The owner or operator of charcoal kilns shall develop, submit for department approval, and establish a maintenance practices manual for each charcoal kiln control system. This manual shall be maintained at each site for the specific emission control device(s) installed at the site. At a minimum, this manual shall include:

      1. 1. Maintenance of all equipment (e.g. proper cleaning of

inlet ports);

1. 2. Measures taken in the event of emission control device

failure to minimize emissions (e.g. opening kiln caps and air vents to allow kiln wood to burn down to minimize smoking conditions or shutting all kiln inlets and outlets until all combustion in the chamber is extinguished);

1. 3. Inspections performed and frequency (e.g. daily burner

operation); and

1. 4. Methods of reporting and recordkeeping under section

1. (4) of this rule.

   1. (F) Performance Testing and Compliance Determinations.

      1. 1. For compliance determination, each charcoal kiln

control system shall be evaluated as a unit and performance tested for compliance with the emission limit requirements of paragraphs (3)(A)1. and 2. of this rule.

1. 2. All charcoal kiln control system performance tests shall

be conducted with each charcoal kiln of the system filled to at least ninety percent (90%) of fill capacity and at the midpoint of burn cycle unless otherwise noted. The midpoint of each charcoal kiln burn cycle shall be no less than forty percent (40%), and no more than sixty percent (60%) of the total burn cycle.

1. 3. Emission control device fuel type(s) and quantity(ies)

used during the performance test shall be recorded.

1. 4. All performance test operating temperatures shall be

recorded with a continuous recording device that is permanently installed, and the temperature shall be continuously displayed and recorded throughout the entire performance test.

1. 5. Each performance test shall consist of a minimum of

three (3) runs for each pollutant specified in paragraph (3)(A)2. of this rule and conducted using the test methods specified in section (5) of this rule. The duration of each test run shall be one (1) hour unless the test method requires a longer duration. Compliance shall not be considered demonstrated until the department has validated performance test results.

1. 6. Compliance determinations for visible fugitive emission

requirements of this rule shall use the test method specified in subsection (5)(E) of this rule.

1. 7. The director may allow similar charcoal kiln control

system units to operate without the individual performance tests required by paragraph (3)(F)1. if the following conditions are met:

1. A. Similar units have the same number of charcoal kilns,

similar construction, capacities within ten percent (10%) of each other, and similar design;

1. B. Similar units are controlled by emission control

devices with the same construction, the same size, and the same design; and

1. C. Three (3) separate similar units have successfully

demonstrated compliance with the emission limit requirements of paragraphs (3)(A)1. and 2. of this rule.

1. 8. Control efficiency (CE) shall be calculated from

performance test data using the following calculation:

Outlet Emission Rate

Inlet Emission Rate CE = ( 1 - ) × 100

1. 9. Any existing charcoal kiln that has been inactive for sixty

1. (60) months or longer shall comply with all federal and state rules, and obtain a construction permit prior to reactivation.

2. (4) Reporting and Record Keeping.

   1. (A) Owners or operators of all charcoal kilns shall maintain a file on each active charcoal kiln with the following information for a minimum of five (5) years from the date the data was collected:

      1. 1. Average annual production (tons of charcoal per charcoal

manufacturing installation per year divided by the number of charcoal kilns at the charcoal manufacturing installation);

1. 2. Start-up time (hour and minute) for each burn cycle;
2. 3. Emission control device temperature (in degrees

Fahrenheit) throughout each burn cycle shall be measured at a point in the emission control device where gas residence time is no less than the applicable residence time under paragraph (3)(B)4. of this rule;

1. 4. The emission control device temperature shall be

continuously displayed and recorded by a continuous recording device;

1. 5. Daily log for each charcoal kiln control system that

includes start-up time(s), cool-down time(s), re-light time(s), and inspections performed (e.g. burn chamber);

1. 6. Monthly log for each charcoal kiln control system that

includes fuel usage and, where more than one (1) type of fuel is used, fuel types and times of usage;

1. 7. Malfunction log for each charcoal manufacturing

installation that includes a description of each malfunction cause, duration, and actions taken to remedy the malfunction; and

1. 8. Performance test reports for all emission control devices

tested.

1. (B) Owners or operators of all charcoal kilns shall provide the department with a list of the identification numbers of active charcoal kilns at each location. If the active status of any charcoal kiln changes, including the construction of new charcoal kilns, the owner or operator shall provide an updated list to the department no later than thirty (30) days after the status change.
2. (C) All information maintained in the charcoal kiln file shall be made immediately available to Missouri Department of Natural Resources representatives upon request.

1. (5) Test Methods.

   1. (A) Particulate matter emission level testing shall include condensables and use the following methods:

      1. 1. Method 1—Sample and Velocity Traverses for Stationary

Sources under 40 CFR 60, Appendix A as specified in 10 CSR 10-6.030(22);

1. 2. Method 2—Determination of Stack Gas Velocity and

Volumetric Flow Rate (Type S Pitot Tube) under 40 CFR 60, Appendix A as specified in 10 CSR 10-6.030(22);

1. 3. Method 3—Gas Analysis for the Determination of Dry

Molecular Weight under 40 CFR 60, Appendix A as specified in 10 CSR 10-6.030(22);

1. 4. Method 4—Determination of Moisture Content in Stack

Gases under 40 CFR 60, Appendix A as specified in 10 CSR 10- 6.030(22);

1. 5. Method 5—Determination of Particulate Matter

Emissions from Stationary Sources under 40 CFR 60, Appendix A as specified in 10 CSR 10-6.030(22); and

1. 6. Method 202—Dry Impinger Method for Determining

Condensable Particulate Emissions from Stationary Sources under 40 CFR 51, Appendix M as specified in 10 CSR 10-6.030(21).

1. (B) VOC emission level testing shall use one (1) of the following methods under 40 CFR 60, Appendix A as specified in 10 CSR 10-6.030(22):

   1. 1. Method 18—Measurement of Gaseous Organic

Compound Emissions by Gas Chromatography; or

1. 2. Method 25A—Determination of Total Gaseous Organic

Concentration Using a Flame Ionization Analyzer.

1. (C) CO emission level testing shall use Method 10— Determination of Carbon Monoxide Emissions from Stationary Sources under 40 CFR 60, Appendix A as specified in 10 CSR 10-6.030(22).
2. (D) Emissions percent opacity testing shall use Method 9—Visual Determination of the Opacity of Emissions from Stationary Sources under 40 CFR 60, Appendix A as specified in 10 CSR 10-6.030(22).
3. (E) Visible fugitive emissions testing shall use Method 22— Visual Determination of Fugitive Emissions from Material Sources and Smoke Emissions from Flares under 40 CFR 60, Appendix A as specified in 10 CSR 10-6.030(22).

AUTHORITY: sections 643.030, 643.050, 643.075, and 643.078, RSMo 2016.* Original rule filed Nov. 25, 1997, effective July 30, 1998. Amended: Filed June 21, 2018, effective March 30, 2019. Amended: Filed Aug. 9, 2019, effective May 30, 2020. *Original authority: 643.030, RSMo 1965; 643.050, RSMo 1965, amended 1972, 1992, 1993, 1995, 2011; 643.075, RSMo 1972, amended 1988, 1992, 2015; and 643.078, RSMo 1992, amended 2015.