EEA Database on Distributed Generation – Yolo-Solano Air Quality Management District

AIR EMISSIONS REGULATIONS:

Air Quality Status	Severe nonattainment for ozone (The AQMD is all of Yolo and the eastern portion of Solano counties) EPA's Nonattainment Areas
Major Source Threshold	25 tons of VOC or NOx triggers NSR
Minor Source Permitting Exemption	Less than 50 hp or 3 MMBtu/hr
Minor Source Treatment	BACT
Emergency Generating Limits	200 hrs/year

DE MINIMIS EXEMPTIONS (Must meet 1298)

To be exempted from permitting an engine must be less than 50 hp, turbines must be smaller than 3 MMBtu/hr and any source emitting less than 2 lb per day of each criteria pollutant.

MINOR SOURCE PERMITTING

Sources with a potential to emit more than the following rates must apply BACT:

Pollutant	Emissions Limit (lbs/day)
NOx	10 lbs
SO2	80 lbs
CO	250 lbs
VOC	10 lbs
PM-10	80 lbs
Lead	3.3 lbs

BACT cost thresholds include operating costs and are as follows:

Pollutant	Cost Threshold ($/ton)
NOx	$24,500
SO2	$3,900
CO	$300
VOC	$17,500
PM-10	$5,700

Most sources take a ppm limit in the permit to avoid BACT requirements. Sources that do not trigger BACT must still obtain a permit. There are also fuel-based NOx limits for IC engines. They are:

Engine Type	Level of Control (ppmv)
Rich-burn	NOx: 90 ppmv CO: 2,000 ppmv
Lean-burn >100 hp	NOx: 150 ppmv CO: 2,000 ppmv
Lean-burn <100 hp	NOx: 300 ppmv CO: 2,000 ppmv
Diesel fired	NOx: 600 ppmv CO: 2,000 ppmv

Sources must also obtain emission offsets if they emit more than the following:

Pollutant	Emissions Limit (lbs/quarter)
NOx	7,500 lbs
SO2	13,650 lbs
CO	49,500 lbs
VOC	7,500 lbs
PM-10	13,650 lbs

In addition peaking units must provide offsets if emitting above the following rates:

Pollutant	Emissions Limit (lbs/day)
NOx	150 lbs
SO2	150 lbs
CO	550 lbs
VOC	150 lbs
PM-10	80 lbs

TREATMENT OF EMERGENCY ENGINES

Emergency engines are permitted for 200 hours of operation per year. Up to 50 of those hours can be used for maintenance and testing. Emergency engines are limited to operation during emergencies.

Yolo-Solano Air Quality Management District-CALIFORNIA