NORTH COAST UNIFIED AIR QUALITY MANAGEMENT DISTRICT

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

    1. 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.

    2. 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

    1. 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

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

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 The requirements of Rule 420 (d)(1-3) are applicable unless superseded by any more restrictive NSPS, BACT, or permit conditions.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

Process Weight Rate

Rate of Emission

 

Process Weight Rate

Rate of Emission

Lb/Hr

Kg/Hr

Lb/Hr

 

Lb/Hr

Kg/Hr

Lb/Hr

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

5.38

 

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.