BAY AREA AIR QUALITY MANAGEMENT DISTRICT
Best Available Control Technology (BACT) Guideline

Source Category

Source: IC Engine - Compression Ignition Revision: 5
Document #: 96.1.1
Class: < 175 horsepower output rating Date: 01/11/02

Determination

POLLUTANT

 BACT
1. Technologically Feasible/ Cost Effective
2. Achieved in Practice
3. TBACT		 TYPICAL TECHNOLOGY
POC 1.  1.1 g/bhp-hr [216 ppmvd @ 15% O2] a,b


2.  1.5 g/bhp-hr [309 ppmvd @ 15% O2] b,c

 1. Catalytic Oxidation and/or CARB or EPA (or equivalent) low-total hydrocarbon emitting certified engine a,b
 2.  CARB or EPA (or equivalent) low-total hydrocarbon emitting certified engine b,c
NOx 1.  1.5 g/bhp-hr [107 ppmvd @ 15% O2] a,b

2.  6.9 g/bhp-hr [490 ppmvd @ 15% O2] a,b,c
3. 6.9 g/bhp-hr [490 ppmvd @ 15 % O2] d		 1.  Selective Catalytic Reduction (SCR) + Timing Retard + Turbocharger w/ Intercooler a,b
2.  Timing Retard < 4o + Turbocharger w/ Intercooler a,b,c
 3. Timing Retard < 4o + Turbocharger w/Intercooler
SO2 1. n/d
2.  If practical, gas-fueled engine or electric motor.  If not, "California Diesel Fuel"( fuel oil < 0.05% by weight sulfur) a,b		 1. n/d
2.  Fuel Selection a,b
CO 1.  n/s
2.  2.75 g/bhp-hr [319 ppmvd @ 15% O2] b,c		 1.  Catalytic Oxidationb
2.  CARB or EPA (or equivalent) low-CO emitting certified engine b,c
PM10 1. n/d
2.  If practical, gas-fueled engine or electric motor.  If not, "California Diesel Fuel" ( fuel oil w/ < 0.05% by weight sulfur and < 20% by volume aromatic hydrocarbons) b
 3. 0.1 grams/bhp-hr 		1. Catalyst Guard Bed a,b
2.  Fuel Selection b


3. CARB or EPA (or equivalent) low-particulate matter emitting certified engine, or particulate filter

NPOC 1. n/a
2. n/a		 1.  n/a
2. n/a

References

a.  CARB/CAPCOA Clearinghouse
b.  BAAQMD, NOTE:  IC Engine BACT and TBACT is a low emitting, spark-ignited, gas-fueled engine with lean burn combustion or rich burn with non-selective catalytic reduction, or electric motor. A diesel engine will be permitted only if a gas-fueled engine, or electric motor, is not practical (e.g., a remote location without natural gas availability or electric power, or only a diesel engine will meet the portability and/or power/torque/rpm requirements of the application under review, or the engine is used exclusively for emergency use during involuntary loss of power).
c.  Timing retard, etc. controls alone may be acceptable only in very limited situations for temporary sources.