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 |
||||||
|
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.
(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.