11 Miss. Code. R. 2-1.2 - Definitions

The terms used in the regulations shall, unless the context otherwise requires, have the following meanings:

A. "Air cleaning device." Any method, process or equipment which removes, reduces or renders less noxious air contaminants discharged into the atmosphere. This term is synonymous with air pollution control device.

B. "Air contaminant." Particulate matter, dust, fumes, gas, mist, smoke, or vapor, or any combination thereof produced by processes other than natural.

C. "Air contamination." The presence in the outdoor ambient air of one or more air contaminants which contribute to a condition of air pollution.

D. "Air contamination source." Any source at, from, or by reason of which there is emitted into the ambient air any air contaminant, regardless of who the person may be who owns or operates the building, premises, or other property in, at, or on which such source is located, or the facility, equipment or other property by which the emission is caused or from which the emission comes.

E. "Air contaminant point source." Any single point of emissions of any air contaminant such as from an individual machine or combustion device.

F. "Air pollution." The presence in the outdoor ambient air of one or more air contaminants in quantities, of characteristic, and of a duration which are materially injurious or can be reasonably expected to become materially injurious to human, plant, or animal life or to property, or which unreasonably interfere with enjoyment of life or use of property throughout the State or throughout such area of the State as shall be affected thereby.

G. "Air Quality Action Day." A day(s) the Executive Director determines that the air quality data within a specifically named area within the state may reach levels at or above the national ambient air quality standard for a specific pollutant

H. "Ambient air." The encompassing atmosphere existing in the matter of space and to which life of this earth is adapted. For the purposes of these regulations, that portion of the atmosphere outside of buildings, stacks, and ducts.

I. "Atmosphere." The air that envelopes or surrounds the earth. This term is synonymous with ambient air.

J. "Commission." The Mississippi Commission on Environmental Quality.

K. "Excess (or excessive) emission." The operation of a facility in which the emission of one or more pollutants exceeds the applicable limit(s).

L. "Fly ash." Particulate matter capable of being gasborne or airborne or carried in the gas stream and consisting essentially of ash, fused ash, and/or unburned material.

M. "Ground level." Unless otherwise specified in sampling techniques, will be considered to be in the range of one to twenty (20) feet of ground level. For ambient sampling, it shall also be outside the boundaries of the property which contains the air pollution source.

N. "Incinerator." A combustion device specifically designed for the destruction by high temperature burning of solid, semi-solid, liquid or gaseous combustible wastes and from which the solid residues contain little or no combustibles.

O. "Modification." Any physical change in, or change in the method of operation of, an affected facility which increases the amount of any air pollutant emitted by such facility or which results in the emission of any air pollutant not previously emitted, except that:

(1) Routine maintenance, repair and replacement shall not be considered physical changes, and

(2) An increase in the production rate or hours of operation shall not be considered a change in the method of operation, unless it is prohibited by a permit.

P. "Multiple chamber incinerator." Any article, machine, equipment, contrivance, structure, or any part thereof used to dispose of combustible refuse by burning, which consists of three or more refractory walls, interconnected by gas passage points or ducts and employing adequate design parameters necessary for maximum combustion of the material to be burned.

Q. "Opacity." The degree to which emissions reduce the transmission of light and obscure the background.

R. "Open burning." The combustion of solid waste without (1) control of combustion air to maintain adequate temperature for efficient combustion, (2) containment of the combustion reaction in an enclosed device to provide sufficient residence time and mixing for complete combustion, and (3) control of the emission of the combustion products.

S. "Ozone Action Day." A day(s) occurring between March 1 and October 31 of each year which the Executive Director has designated as being conducive to high rates of ozone formation for a named county(ies) among DeSoto, Hancock, Harrison, and Jackson Counties.

T. "Particulate matter." Any airborne finely divided solid or liquid material with an aerodynamic diameter smaller than 100 micrometers.

U. "Particulate matter emissions." All finely divided solid or liquid material, other than uncombined water, emitted to the ambient air as measured by an applicable EPA Test Method, an equivalent or alternative method specified by the EPA, or by a test method specified in the approved State Implementation Plan.

V. "Person." The State or other agency, or institution thereof, any municipality, political subdivision, public or private corporation, individual, partnership, association, or other entity, and includes any officer or governing or managing body of any municipality, political subdivision, or public or private corporation, or the United States or any officer or employee thereof.

W. "PM2.5" Particulate matter with an aerodynamic diameter less than or equal to a nominal 2.5 micrometers as measured by a reference method based on Appendix L of 40 CFR 50 and designated in accordance with 40 CFR 53 or by an equivalent method designated in accordance with 40 CFR Part 53.

X. "PM2.5 emissions." Finely divided solid or liquid material, with an aerodynamic diameter less than or equal to a nominal 2.5 micrometers, emitted to the ambient air as measured by an applicable EPA Test Method, an equivalent or alternate method specified by the EPA, or by a test method specified in the approved State Implementation Plan.

Y. "PM10." Particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometers as measured by a reference method based on Appendix J of 40 CFR 50 and designated in accordance with 40 CFR 53 or by an equivalent method designated in accordance with 40 CFR Part 53.

Z. "PM10 emissions." Finely divided solid or liquid material, with an aerodynamic diameter less than or equal to a nominal 10 micrometers, emitted to the ambient air as measured by an applicable EPA Test Method, an equivalent or alternate method specified by the EPA, or by a test method specified in the approved State Implementation Plan.

AA. "Process weight." The total weight of all materials introduced into a source operation including solid fuels and water. Excluded materials are as follows: Liquids and gases used solely as fuels or as a means of conveyance, liquids used as a pollutant removal medium, recycled process materials counted at initial introduction, and air introduced for purposes of combustion.

BB. "Recreational area." Recreational area means:

(1) a national, state, county, or city designated park; or

(2) an outdoor recreational area, such as a golf course or swimming pool, owned by a city, county, or other public agency.

CC. "Residential area." Residential area means:

(1) a group of 20 or more single family dwelling units on contiguous property and having an average density of two or more units per acre, or

(2) a group of 40 or more single family dwelling units on contiguous property and having an average density of one or more units per acre, or

(3) a subdivision containing at least 20 constructed houses, in which the subdivision plat is recorded in the chancery clerk's office of the appropriate county.

DD. "Shutdown." The termination of operation of equipment. Relative to fuel-burning equipment, a shutdown shall be construed to occur only when a unit is taken from a fired to a non-fired state.

EE. "Smoke." Small gasborne particles resulting from incomplete combustion and consisting predominantly, but not exclusively, of carbon, ash, and other combustible material.

FF. "Soot." Aggregated particles consisting mainly of carbonaceous material.

GG. "Soot blowing." The removal by mechanical means of accumulated carbon and/or ash from heat transfer surfaces of an operating fuel-burning unit.

HH. "Standard conditions." Standard conditions for gas measurement and calculation will be a temperature of 60 degrees Fahrenheit and a pressure of 14.7 pounds per square inch absolute except where set by Applicable Rules and Regulations.

II. "Startup." The bringing into operation from a non-operative condition. Relative to fuel-burning equipment, a startup shall be construed to occur only when a unit is taken from a non-fired to a fired state.

JJ. "Total reduced sulfur, (TRS)" means hydrogen sulfide, mercaptans, dimethyl sulfide, and any other organic sulfides present.

KK. "Total suspended particulate." Particulate matter as measured by the method described in Appendix B of 40 CFR 50.

LL. "Upset." An unexpected and unplanned condition of operation of the facility in which equipment operates outside of the normal and planned parameters. An upset shall not include a condition of operation caused by improperly designed equipment, lack of preventive maintenance, careless or improper operation, operator error, or an intentional startup or shutdown of equipment.

Notes

11 Miss. Code. R. 2-1.2

Miss. Code Ann . §§ 49-2-9(1)(b), 49-2-1, et seq., 49-17-17 and 49-17-1, et seq.

Amended 12/20/2014 Amended 12/10/2016 Amended 6/24/2018