MENDOCINO COUNTY 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) 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 the more 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

Lbr/Hr

Kg/Hr

Lb/Hr

Lb/Hr

Kg/Hr

Lb/Hr

100

200
400

45

92
183

0.55

0.88
1.40

6000

7000
8000

2720

3380
3680

8.6

9.5
104

600

800
1000

275

377
454

1.83

2.22
2.58

9000

10,000
12,000

4134

4540
5460

11.2

12.0
13.6

1500

2000
2500

68`

920
1147

3.38

4.10
4.76

16,000

18,000
20,000

7260

8220
9070

16.5

17.9
19.2

3000

3500
4000
5000

1362

1690
1840
2300

5.38

5.96
6.52
7.58

30,000

40,000
50,000
60,000
or more

13,600

18,100
22,700
27,200

25.2

30.5
35.4
40.0
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.

(e) 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.