NCUAQMD RULE 1-4-420 PARTICULATE MATTER
LAST REVISED 11/11/11

RULE 420 - PARTICULATE MATTER

(a) General Combustion Sources

A person shall not discharge particulate matter into the atmosphere from any combustion source in excess of 0.46 grams per standard cubic meter (0.20 grains per standard cubic foot)of exhaust gas, calculated to 12 percent carbon dioxide; or in excess of the limitations of NSPS Rule 490, as applicable.

(b) Steam Generating Units

A person shall not discharge particulate matter into the atmosphere from any steam generating unit, installed or modified after July 1, 1976, in excess of 0.23 grams per standard cubic meter (0.10 grains per standard cubic foot) of exhaust gas, calculated to 12 percent carbon dioxide; or in excess of the limitations of NSPS Rule 490.

(c) Steam Generating Utility Power Plants

Effective July 1, 1990, all existing steam generating power plants which produce electric power for sale to any public utility shall not discharge particulate matter into the atmosphere in excess of 0.10 pounds per million BTU heat input or any other specific applicable permit limitation, which ever is the more restrictive emission condition.

(d) Kraft Pulp Mills

(1) Recovery Furnaces

(a) The emissions of particulate matter from any kraft recovery furnace shall not exceed 0.23 grams per standard cubic meter (0.10 grains per standard cubic foot) of exhaust gas corrected to 8 percent oxygen or 4.0 pounds per ton of kraft pulp mill production, whichever is the more restrictive condition.

(b) The emissions of particulate matter from any new or modified Kraft recovery furnace shall not exceed 0.025 grains per standard cubic foot of exhaust gas corrected to 8 percent oxygen.

(2) Lime Kiln

(a) The emissions of particulate matter from any lime kiln shall not exceed 0.46 grams per standard cubic meter (0.20 grains per standard cubic foot) of exhaust gas corrected to 10 percent oxygen or 1.0 pounds per ton of kraft pulp mill production, whichever is the more restrictive condition.

(3) Smelt Dissolvers

(a) The emissions of particulate matter from any smelt dissolving tank shall not exceed 0.5 pounds per ton of Kraft pulp mill production.

(b) The emissions of particulate matter from any new or modified smelt dissolving tank shall not exceed 0.20 pounds per ton of black liquor solids on a dry basis.

(4) The requirements of Rule 420 (d)(1-3) are applicable unless superseded by any more restrictive NSPS, BACT, or permit conditions.

(e) Non-Combustion Sources

A person shall not discharge particulate matter into the atmosphere from any non-combustion source in excess of 0.46 grams per actual cubic meter (0.20 grains per cubic foot) of exhaust gas or in total quantities in excess of the amount shown in Table I, whichever is the more restrictive condition.

(f) Geothermal Well Drilling

Notwithstanding the provisions of Rule 420(d), a person shall not discharge particulate into the atmosphere from any geothermal steam source in excess of the quantity established by the following formula:

Y = .00069X + 1.4

where y is the particulate emission rate limitation in kilograms per hour (averaged over one hour) and X is the steam rate in kilograms per hour passing through a geothermal well drilling operation or any geothermal well being vented for clean out.

TABLE I

ALLOWABLE RATE OF EMISSION BASED ON

PROCESS WEIGHT RATE

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Process Weight Rate of Process Weight Rate of

Rate Emission Rate Emission

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Lb/Hr Kg/Hr Lb/Hr Lb/Hr Kg/Hr Lb/Hr

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100 45 0.55 6,000 2,720 8.6

200 92 0.88 7,000 3,380 9.5

400 183 1.40 8,000 3,680 10.4

400 183 1.40 8,000 3,680 10.4

600 275 1.83 9,000 4,134 11.2

800 377 2.22 10,000 4,540 12.0

1,000 454 2.58 12,000 5,460 13.6

1,500 681 3.38 16,000 7,260 16.5

2,000 920 4.10 18,000 8,220 17.9

2,500 1,147 4.76 20,000 9,070 19.2

3,000 1,362 5.383 30,000 13,600 25.2

3,500 1,690 5.96 40,000 18,100 30.5

4,000 1,840 6.52 50,000 22,700 35.4

5,000 2,300 7.58 60,000 27,200 40.0

or more

Where the process weight per hour is between two listed figures, such process weight and maximum allowable particulate emission per hour shall be interpolated linearly. The total process weight of all similar process operations located at a single plant or of similar multiple plants located on a single premise, shall be used for determining the maximum allowable particulate emission from the combination of such operations.