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

Source Category

Source: Boiler Revision: 3
Document #: 17.2.1
Class: >33.5 MMBtu/hr to <50 MMBtu/hr Heat Input Date: 05/13/98

Determination

POLLUTANT

 BACT
1. Technologically Feasible/ Cost Effective
2. Achieved in Practice		 TYPICAL TECHNOLOGY
POC 1. n/d
2. n/s		 1.  n/d
2. Good Combustion Practicea
NOx 1. 9 ppmv @ 3% O2 Dry a,b,c

2. 25 ppmv @ 3% O2 Dry a,b,c		 1. Low NOx Burners + Flue Gas Recirculation + Selective Catalytic Reductiona
2. Low NOx Burners + Flue Gas Recirculationa
SO2 1. Natural Gas or Treated Refinery Gas Fuel w/ <.50 ppmv Hydrogen Sulfide and <100 ppmv Total Reduced Sulfur a,b
2. Natural Gas or Treated Refinery Gas Fuel w/ <100 ppmv Total Reduced Sulfur a,c		 1. Fuel Selection a,b


2. Fuel Selection a,b
CO 1. n/d
2. 100 ppmv @ 3% O2 Dry a,d		 1. n/d
2. Good Combustion Practicea
PM10 1. n/d
2.  Natural Gas or Treated Refinery Gas Fuel a,b		 1.  n/d
2. Fuel Section a,b
NPOC 1. n/a
2. n/a		 1.  n/a
2. n/a

References

a. BAAQMD
b. BACT is 20/25 ppmvd NOx @ 3% O2 and 100 ppmvd CO @ 3 % O2 regardless of fuel.  However, emergency backup fuel oil w/ < 0.05 wt. % sulfur may be permitted to emit up to 60 NOx  ppmvd @ 3% O2 and 100 ppmvd CO @ 3 % O2 during natural gas curtailment.
c. NOx  determination by BAAQMD Source Test Method ST-13A or B (average of three 30-minute sampling runs); or Continuous Emission Monitor (3-hour average);  or  BAAQMD approved equivalent.
d.  CO determination by BAAQMD Source Test Method ST-6 (average of three 30 minute sampling runs); or Continuous Emission Monitor (3-hour average), or  BAAQMD approved equivalent.