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Sacramento Metro AQMD |
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Severe nonattainment in all areas under the 8-hr ozone standard. Moderate nonattainment for PM-10 in Sacramento County(The AQMD is all or parts of El Dorado, Placer, Sacramento, Solano, Sutter, and Yolo Counties) |
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25 tons of NOx or VOC; 100 tons per year of SO2, PM10, or CO triggers NSR |
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Equipment that emits less than 2 lbs/day |
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BACT |
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Maxiumum allowed operating hours for maintenance purposes will be 50 hrs/yr. Total operation, maintenance and emergency, will be limited to 200 hours/year. |
DE MINIMIS EXEMPTIONS (Must meet 1298)
Emissions units that emit no more than 0.5 tons/yr of HAPs and no more than 2 tons per year of criteria pollutants are considered insignificant activities. The following combustion and heat transfer equipment are exempt:- Internal combustion engines with a manufacturer's maximum continuous rating of 50 bhp or less or gas turbine engines with a maximum heat input rate of 3 MMBtu/hr or less at ISO standard dry conditions.
- Any combustion equipment that has a maximum heat input of less than 1 MMBtu/hr (gross) and is equipped to be fired exclusively with natural gas, liquefied petroleum gas, or any combination thereof.
* The ratings of all equipment used in the same process will be accumulated to determine whether these exemptions apply.
BACT is required for units with a potential to emit more than 10lbs/day of any criteria pollutant. The District’s Stationary Internal Combustion Engine Policy Overview provides a good overview of applicable District and state standards that would apply. Sample BACT for control of NOx from turbines and internal combustion engines is as follows:
Example BACT Gas Turbine Limits
Requirement |
Hours of Operation (hr/yr) |
Unit Size Rating (MW) |
NOx Emission Limit (ppmv) |
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Gaseous Fuel at 15% O2 |
Liquid Fuel at 15% O2 |
RACT |
Any |
greater than or equal to 0.3 |
42.0 |
65.0 |
BARCT |
Any |
greater than or equal to 0.3 to less than 2.9 |
42.0 |
65.0 |
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less than 877 |
greater than or equal to 2.9 |
42.0 |
65.0 |
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greater than or equal to 877 |
greater than or equal to 2.9 to less than 10 |
25.0 |
65.0 |
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greater than or equal to 877 |
greater than or equal to 10.0 (no SCR) |
15.0 |
42.0 |
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greater than or equal to 877 |
greater than or equal to 10.0 (w SCR) |
9.0 |
25.0 |
Example Internal Combustion EnginesEmission Limitations/BACT
Fuel Type |
Engine Type |
Emission Factor (g/hp-hr) |
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NOx |
CO |
VOC |
SOx |
PM-10 |
Diesel |
Up to 600 hp |
14.06 |
3.0 |
1.14 |
0.1645 |
1.00 |
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Greater than 600 hp |
10.86 |
2.5 |
0.32 |
0.1645 |
0.318 |
Gasoline |
All |
4.99 |
199.13 |
9.79 |
0.1645 |
0.327 |
Natural Gas |
2-Cycle Lean Burn |
10.89 |
1.5 |
0.43 |
0.002 |
0.152 |
<> |
4-Cycle Lean Burn |
11.79 |
1.6 |
0.721 |
0.002 |
0.152 |
<> |
4-Cycle Rich Burn |
9.98 |
8.62 |
0.14 |
0.002 |
0.152 |
Sulfur Content of Fuels
A person shall not burn any gaseous fuel containing sulfur compounds in excess of 1.14 grams per cubic meter (50 grains per 100 cubic feet) of gaseous fuel, calculated as hydrogen sulfide at standards conditions, or any liquid fuel or solid fuel having a sulfur content in excess of 0.5% by weight.
TREATMENT OF EMERGENCY ENGINES
The Airborne Toxic Control Measure for Stationary Compression Engines amendments were finalized on 9/21/05, emergency generators (specifically compression ignition engines) fall under these limitations.
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