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Contact Information:
Great Basin Unified APCD
157 Short Street, Suite 6
Bishop, CA 93514-3537
(760) 872-8211
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Great Basin Unified Air Pollution Control District-CALIFORNIA
DE MINIMIS EXEMPTIONS (Must Meet 1298):
Internal combustion engines with a potential to emit less than 250 pounds per day of all criteria pollutants are
exempt from permitting.
MINOR SOURCE PERMITTING:
Units with a potential to emit 250 pounds per day of a criteria pollutant trigger BACT. The air district follows
CARB's guidance for
permitting of electric generating technologies which is available at. Sample BACT for control of NOx from turbines
and internal combustion engines is as follows:
| Size of Unit |
Level of Control (ppm) |
| >3 MW |
9 |
| 3-12 MW simple cycle |
2.5 |
| 3-12 MW combined cycle |
5 |
| 12-50 MW simple cycle |
2.5 |
| 12-50 MW combined cycle |
5 |
| IC Engines |
9 |
Units that don't trigger BACT may require controls on a case by case basis based on an impact analysis.
The entire permitting process takes less then 6 months.
TREATMENT OF EMERGENCY ENGINES:
Emergency engines must obtain a permit. There are no rules specifically addressing these types of units. The air
district may require timing retardation, a particulate trap on a diesel engine or an hourly limit. Units are allowed
to operate during nonemergency situations as the air district determines.
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