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Contact Information:
Monterey Bay Unified APCD
24580 Silver Cloud Ct.
Monterey, CA 93940-6536
(831) 647-9411
Or view the Department's
Website
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Monterey Bay Unified Air Pollution Control District-CALIFORNIA
DE MINIMIS EXEMPTIONS (Must Meet 1298):
Units smaller than 100 hp are exempt from permitting.
MINOR SOURCE PERMITTING:
All sources must meet a 20% opacity limit. If a single unit has the potential to emit 25 pounds per day or more
of NOx or VOCs the unit must install state BACT. Facility-wide the BACT trigger is 150 pounds per day of NOx or
VOC. The air district does not have additional requirements for SO2, PM or CO. 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 |
The entire permitting process may take up to 180 days, but is generally completed more quickly.
TREATMENT OF EMERGENCY ENGINES:
Case-by-case exemptions are available from the permitting agency. Units that are not exempted must obtain a permit.
Emergency engines will generally be limited to 60 hours per year for maintenance and testing and may only operate
otherwise during actual emergencies.
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