NORTHERN SONOMA COUNTY AIR POLLUTION CONTROL 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)
Kraft Recovery Furnaces
A person shall not discharge particulate matter into the atmosphere from any kraft recovery furnace 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.

(d)
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 themore restrictive condition.

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