MEMORANDUM

TO: Docket ID No. EPA-HQ-OAR-2002-0058

FROM: Jim Eddinger, U.S. Environmental Protection Agency, OAQPS

DATE: November 2011

SUBJECT: Revision of Alternat e Equivalent Output-Based Emission Limits for Boilers and Process Heaters located at Major Source Facilities

The purpose of this memorandum is to pr esent the revised methodology used during

reconsideration of the Boiler MACT (40 CFR subpart DDDDDD) and the revised results for the

proposed alternate output-based emission limits that are equivalent to the maximum achievable

control technology (MACT) floor determinations fo r boilers and process heaters at major sources

of hazardous air pollutants (HAP) reported in th e memorandum “Revised MACT Floor Analysis

(November 2011) for the Industria l, Commercial, and Institutiona l Boilers and Process Heaters

National Emission Standards for Hazardous Air Pollutants – Major Source.”

The methodology was modified based on the petition for reconsideration submitted by

the Alliance for Industrial Efficiency and US Clean Heat Power Associ ation. The petitioner

found that EPA’s calculations often resulted in effi ciencies that were unrea listically high, often

above 100%, which is a physical impossibility. The petitioners attributed th is to the fact that

EPA had disregarded feedwater temperature (i ndustry average being 280 degrees F) and if

included would cause the average efficiency ca lculation to drop to more realistic levels.

In addition, Wisconsin Electric Power commente d that the output based standards, in

units of pounds per million Btu steam (lb/MMBtu st eam), punish electric generating units (those

not covered by the utility MACT), by not taking into account turbine efficiencies.Thus, the alternate equivalent output-based em ission limits in the final rule were revised

based on recalculated boiler efficiencies that in cluded the heat (energy) associated with the

feedwater. Also, as described later in th is memorandum, equivalent output-based emission

limits in units of pounds per megawatt-hour (lb/ Mwh) were determined for units generating

electricity only.

Revision of Output-Based Emission Limits in Units of lb/MMBtu steam

In the January 2011 memorandum, the convers ion from the final MACT limits, in pound

per million Btu heat input (lb/MMBtu), to an eq uivalent output basis, lb/MMBtu steam, was

based on the calculated average boiler efficiency of the best performing units. Boiler efficiency,

in that earlier memorandum, was defined as steam (Btu output) divided by the heat or fuel (Btu

input). As the petitioners point out this is not the appropriate appro ach to calculating boiler

efficiencies because it does not account for the energy to heat the feedwater.

The boiler efficiencies of the best perfor ming units for each subcategory were revised

using Equation 1:

Equation 1

The feedwater Btu in was calculated assumi ng the industry average temperature of 280 o F,

resulting in a heat content value of 249.3 Btu /lb feedwater. The steam energy output and the

heat (fuel) input for each best performing unit were the same as previously determined. Even

with this new approach to include the feedwate r heat, the calculated boiler efficiency for some

best performing units were unrealistically high, as high as 110 percent. This, we assumed, wasdue to one of the reported values being inaccura tely reported. Thus, we made the assumption

that a calculated boiler efficiency of greater than 85 percent was an outlier. We then, for each

subcategory, determined the subc ategory-specific average boiler efficiency using all the best

performing units within that pa rticular subcategory having appr opriate boiler efficiencies.

Average boiler efficiencies are specific to a certa in subcategory. Sixteen different subcategories

of existing units were targeted in this analysis , all of which are listed in Table 1. The average

boiler efficiencies in Table 1 were developed base d only on those units that were also identified

as best performing units for the reconsideration proposal.

However, the revised average boiler efficien cies in Table 1 are not the appropriate

conversion factors to convert from fuel (MMBtu/h) in to steam (MMBtu/h) generated. They are

the more appropriate average boiler efficiencies , but as defined, they are not the appropriate

conversion factors to go from heat (fuel) input to total steam ge nerated. The boiler efficiencies

are total steam generated minus steam used for h eating the feedwater divi ded by the heat (fuel)

input. So, the output-based limits (lb/MMBtu st eam) in the proposed rule were developed by

applying the average conversion fa ctor (steam Btu out/fuel Btu in) to the proposed MACT limits

to develop the revised alternate output-based lim its in lb/MMBtu steam. The conversion factor

for each subcategory was calculated by averaging the conversion factor for each best performing

unit having an appropriate boiler efficiency.Table 1 – Conversion Factors for Existing Sources

Subcategory Boiler Efficiency (%) Conversion Factor (Steam Btu Out/ Fuel Btu In) Comment Range Average

Solid 45.5 – 84.9 72.3 0.89 Biomass – Dutch Oven (DO) 53.4 – 60.5 58.2 0.72

Biomass – Fluidized Bed (FB) 62.9 – 67.0 65.0 0.81

Biomass – Fuel Cell (FC) 45.5 – 67.2 56.4 0.37

Biomass – Suspension Burner (Susp.B) 78.4 – 78.4 78.4 0.99 Based on design steam values

Biomass – Suspension Grate (Susp.G) 53.6 – 64.9 57.8 0.80

Biomass – Wet/stoker 60.0 – 81.2 69.5 0.87

Biomass – Dry/stoker No output data on dry/stoker 69.5 0.87 Same as Wet/stoker

Coal - FB 68.1 – 83.6 78.6 0.96 Coal – Pulverized Coal (PC) 60.9 – 84.7 77.9 0.99

Coal - Stoker 58.7 – 84.9 75.9 0.95 Liquid 60.9 – 73.3 67.1 0.80 Liquid - Heavy 73.3 73.3 0.83 Liquid - Light 60.9 60.9 0.77 Based on 1 unit

Non-Continental Liquid No outputdata on NonContinental 73.3 0.83 Assumed same as heavy liquid

Process Gas 50.4 50.4 0.60 Based on 1 unit

Assumption – any unit with a boiler efficien cy of greater than 85% was an outlier.

For each new subcategory, Table 2 lists the boi ler efficiency of the best performing unit

used as the basis of the new source MACT fl oor calculations, having an appropriate boiler

efficiency, for each particular HAP/subcategory. If the best performing unit did not have data

available, data from the next lowest emitting unit in the subcategory were used to fill data gaps.

The conversion factor listed in Table 2 is the unit’s corresponding conversion factor.Table 2 – Conversion Factors for New Sources

Subcategory Best Performing Unit

Comment Facility ID Unit ID Boiler Efficiency (%) Conversion Factor (Steam Btu

Out/Fuel

Btu In) Hg Solid INPurdueUniverisity Boiler 5 76.0 0.92

HCl Solid ARPotlatchForestWa

rren Wellons Boiler 60.5 0.74

Hg Liquid MNGPDuluth EU33 Boiler #3 73.3 0.92

HCl Liquid MNGPDuluth EU33 Boiler #3 73.3 0.92

PM Biomass - DO ARPotlatchForestWa

rren Wellons Boiler 56.1 0.66

PM Biomass - FB ORGeorgiaPacificW aunaMill EU35 67.0 0.82

PM Biomass - FC IDPotlatch PE-1 CE 56.4 0.37

PM Biomass – Susp.B MNAndersonCorpBa yport Boiler 11 EU620 78.4 0.99

PM Biomass – Susp.G FLUSSugarCorp Boiler No.8 57.8 0.80

PM Biomass –

Wet/stoker MSGPNewAugusta AA-015 PB 70.3 0.87

PM Biomass –

Dry/stoker No output data on PM Biomass – Dry/stoker 70.3 0.87 Same as PM Biomass – Wet/stoker

PM Coal - FB IAArchersDanielsMi dlandDesMoines Asea Boiler #1 80.2 0.98

PM Coal - PC IAUofNorthernIowa Boiler #3 81.0 1.01

PM Coal -

Stoker TNCargillMemphis Stoker Boiler 8001 80.9 1.00
PM Liquid

Heavy MNGPDuluth EU33 Boiler #3 73.3 0.92
PM Liquid Light SCGPChemRussellvi lle FO Boiler 60.9 0.77

CO Biomass - DO ARWeyerhaeuserDie rksMill SN-45 53.4 0.67

CO Biomass - FB No output data on CO Biomass - FB 67.0 0.82 Same as PM Biomass - FB CO Biomass - FC IDPotlatch PB-1 CE 45.5 0.57CO Biomass – Susp.B No output data on CO Biomass – Susp.B 78.4 0.99 Same as PM Biomass – Susp.B CO Biomass – Susp.G FLUSSugarCorp Boiler No.7 53.6 0.66

CO Biomass –

Wet/stoker INConsolidatedGrain andBarge P17B 66.1 0.84

CO Biomass –

Dry/stoker No output data on CO Biomass – Dry/stoker 66.1 0.84 Same as CO Biomass – Wet/stoker

CO Coal - FB No output data on CO Coal - FB 80.2 0.98 Same as PM Coal - FB

CO Coal - PC AZCatalystPaperSno wflake PB #2 84.2 1.02

CO Coal -

Stoker WVDuPontWashingt onWorks P05 76.2 0.96

CO Liquid

Heavy ORGeorgiaPacificW aunaMill EU33 0.73 No boiler efficiency available for this unit CO Liquid Light SCGPChemRussellvi lle FO Boiler 60.9 0.77

TSM Biomass - DO WAWeyerhaeuser Raymond Hog Fuel Boiler EU1 59.9 0.75

TSM Biomass - FB NDCargillWestFargo FW Boiler (EU43) 62.9 0.79

TSM Biomass - FC IDPotlatch PB-1 CE 45.5 0.57

TSM Biomass – Susp.B TXDibollTempleInland PB-44 78.4 0.99

TSM Biomass – Susp.G No output data on TSM Biomass – Susp.G 57.8 0.80 Same as PM Biomass – Susp.G

TSM Biomass – Wet/stoker MSGPNewAugusta AA-015 Power Boiler 80.2 0.97

TSM Biomass – Dry/stoker No output data on TSM Biomass – Dry/stoker 80.2 0.97 Same as TSM Biomass – Wet/stoker TSM Coal - FB ILPolyOne B1 68.1 0.86

TSM Coal - PC IDTASCONampa Babcock and Wilcox (B&W) #1 79.6 1.00

TSM Coal - Stoker VAUniversityofVirgi nia 7103-1-01R 58.7 0.74Assumption – any unit with a boiler efficien cy of greater than 85% was an outlier. Conversion factor for Non-continental is the same as for Liquid – Heavy Conversion factor for process ga s same as for existing units

We determined the alternate output-based emission limits (lb/MMBtu steam) for each

MACT emission limit by applying the conversion factor for the subcategory to the values

reported in the MACT Floor Memo using Equation 2:

Equation 2

For CO, the input-based emission limits are in units of parts per million at three percent

oxygen (ppm @ 3% O2). These emission limits were first converted to lb/MMBtu before

calculating an output-based emission limit. Equati on 3 was used to convert ppm @ 3% into units

of lb/MMBtu:

Equation 3

The following F d factors were selected from EPA Me thod 19 for the various fuel types:

 For coal, 9780 dscf/MMBtu (from “Bituminous Coal” in Method 19)

 For biomass, 9240 dscf/MMBtu (from “Wood” in Method 19)

 For all liquids, 9190 dscf/MMBtu (from “Oil” in Method 19)

 For process gas, 8760 dscf/MMBtu (from “Natural Gas” in Method 19)

Finally, if the calculated output -based limit for new sources was less-stringent than the

calculated output-based limit for existing sources for the same subcategory, the existing source

limit was used as the new source limit. This is identical to the methods used to establish inputbased limits for new sources, as described in the memorandum, “Revised MACT Floor Analysis(November 2011) for the Industria l, Commercial, and Institutiona l Boilers and Process Heaters

National Emission Standards for Hazardous Air Pollutants – Major Source” in the docket.

The alternate output-based emission limits (lb/MMBtu steam) are summarized for each

subcategory in Appendix A (exi sting sources) and Appendix B (new sources). Appendix C

presents the list of the best pe rforming units for each of the five HAP categories. Appendix D

presents the boiler efficiency (with feedwater) and conversion factor for each of the best

performing units for which we obtai ned steam output information.

Calculation of Output-Based Emi ssion Limits in Units of lb/Mwh

In response to the comment raised that th e output emission limit format of lb/MMBtu

steam is not appropriate for el ectric generating boilers that ar e subject to the Boiler MACT,

output-based emission limits in the format of lb/Mwh were also developed that are equivalent to

the MACT floor determinations for boilers and pr ocess heaters at major sources of HAP reported

in the memorandum “Revised MACT Floor An alysis (November 2011) for the Industrial,

Commercial, and Institutional Boilers and Pro cess Heaters National Emission Standards for

Hazardous Air Pollutants – Major Source.”

The best performing units that are electr ic generating only were identified by ICF

International. Appendix C contains a column at the end that identifies the unit as CHP, Power

Only, or Possibly Thermal Only. ICF also filled in heat rate info for most of the power only

boilers using information from the Department of Energy, Energy Information Administration

(EIA) Form 923 or eGRID 2010. Table 3 presents the best performing units that are electric

generating only and for which we were able to obtain their heat rate.Table 3 – Heat Rates for Power- Only Best Performing Units Facility ID Combustor ID Fuel Category Heat Rate (Btu/kWh) Source
CACovantaDelano Unit 1 Biomass 13,696 EIA Form 923 MEBoralexStratton Boiler #1 Biomass 12,262 EIA Form 923 MIGenessePowerStation Boiler 01 Biomass 15,808 EIA Form 923NJVinelandMuniElectricHowardDown Unit 9 Oil 15,322 eGRID 2010
NYBlackRiverGen E00001 Coal 14,148 EIA Form 923 NYBlackRiverGen E00002 Coal 13,934 EIA Form 923 NYBlackRiverGen E00003 Coal 13,726 EIA Form 923 MICityofEscanaba EUBOILER#1 Coal 12,957 eGRID 2010 MIConsumerEnergyCo EUKEWANEEBOILER Oil 13,332 EIA Form 923 MIConsumerEnergyCo EUAUXBLR12 Oil 13,332 EIA Form 923

NCEPCORRoxboro 1-A Coal 10,246 EIA Form 923 NCEPCORRoxboro 1-B Coal 10,246 EIA Form 923 NCEPCORRoxboro 1-C Coal 10,246 EIA Form 923 NYConEd59thStStationN ewYork Boiler 118 Oil 13,154 EIA Form 923

The average heat rate for th e various fuel types were:

 For coal, 12,215 Btu/kWh (or 12.2 MMBtu/Mwh), based on 7 units,

 For biomass, 13,922 Btu/kWh (or 13.9 MMBtu/Mwh), based on 3 units,

 For oil, 13,785 Btu/kWh (or 13.8 MMBtu/Mwh), based on 4 units, and

 For solid fuel (coal + biomass), 12,727 Btu/kWh (or 12.7 MMBtu/Mwh), based on 10 units.

None of the best performing units that are gas-fired were identified as power only.

Therefore, for gas-fired units, we used a heat rate of 10,399 Btu/kWh (or 10.4 MMBtu/Mwh)

which is reported as the average heat ra te of gas-fired steam turbine units for 2009. 1

We determined the alternate output-based emission limits (lb/Mwh) to each MACT

emission limit by applying the average heat rate (MMBtu/Mwh) for each fuel subcategory to the

values reported in the MACT Floor Memo using Equation 4:

Equation 4

1 Source: U.S. Energy Information Administration, Form EIA

‐ 860, “Annual Electric Generator Report.”If the calculated output-based limit for new s ources was less-stringent than the calculated

output-based limit for existing sources for the same subcategory, the existing source limit was

used as the new source limit. This is identical to the methods used to establish input-based limits

for new sources, as described in the memorandum , “Revised MACT Floor Analysis (November

2011) for the Industrial, Commer cial, and Institutional Boilers and Process Heaters National

Emission Standards for Hazardous Air Pollutants – Major Source” in the docket. The alternate

output-based emission limits (lb/Mwh) are su mmarized for each subcategory in Appendix A

(existing sources) and Appe ndix B (new sources).

### Appendix A

Output-Based Emission Limits for Exis ting Boilers and Process HeatersSummary of Calculated Output-Based (MACT Fl oor) Emission Limits for Existing Boilers and Process Heaters at Major Sources (Units wi th heat input capacity of 10 million Btu per hour or greater)

Subcategory Pollutant MACT (heat inputbased) proposed

emission limits Outputbased emission

limits ( lb per MMBtu of
steam output) Outputbased emission

limits ( lb per Mwh) 1. Solid fuel HCl 0.022 lb per MMBtu of heat input. 0.025 0.28

Mercury 3.1E-06 lb per MMBtu of heat input. 3.5E-06 4.0E-05

2. Pulverized coal boilers CO 41 ppm corrected to 3 percent oxygen, 3-run average. 0.035 0.42

PM (or TSM) 0.044 lb per MMBtu of heat input; or (5.9E-05 lb per MMBtu of heat input). 0.045 or (6.0E-05) 0.54 or (7.3E-04)

3. Stokers designed to burn coal/solid fossil fuel CO 220 ppm by volume on a dry basis corrected to 3 percent oxygen, 3-run average 0.20 2.3

PM (or TSM) 0.028 lb per MMBtu of heat input; or (8.3E-05 lb per MMBtu of heat input). 0.030 or (8.8E-05) 0.35 or (0.0011)

4. Fluidized bed units designed to burn coal/ solid fossil fuel CO 56 ppm by volume on a dry basis corrected to 3 percent oxygen, 3-run average. 0.049 0.57

PM (or TSM) 0.088 lb per MMBtu of heat input; or (1.7E-05 lb per MMBtu of heat input). 0.092 or (1.8E-05) 1.1 or (2.1E04)

5. Stokers/sloped grate/others designed to burn wet biomass fuel CO 790 ppm by volume on a dry basis corrected to 3 percent oxygen, 3-run average. 0.72 8.7Subcategory Pollutant MACT (heat inputbased) proposed

emission limits Outputbased emission

limits ( lb per MMBtu of
steam output) Outputbased emission

limits ( lb per Mwh) PM (or TSM) 0.029 lb per MMBtu of heat input; or (5.7E-05 lb per MMBtu of heat input). 0.034 or (6.6E-05) 0.41 or (8.0E-04)

6. Stokers/sloped grate/others designed to burn kiln-dried biomass fuel CO 250 ppm by volume on a dry basis corrected to 3 percent oxygen. 0.23 2.8

PM (or TSM) 0.32 lb per MMBtu of heat input; or (4.0E-03 lb per MMBtu of heat input). 0.37; or (0.0046) 4.5 or (0.056)

7. Fluidized bed units designed to burn biomass/bio-based solid CO 370 ppm by volume on a dry basis corrected to 3 percent oxygen, 3-run average. 0.36 4.1

PM (or TSM) 0.11 lb per MMBtu of heat input; or (0.0012 lb per MMBtu of heat input). 0.14 or (0.0015) 1.6 or (0.017)

8. Suspension burners designed to burn biomass/bio-based solid CO 58 ppm by volume on a dry basis corrected to 3 percent oxygen, 3-run average. 0.046 0.64

PM (or TSM) 0.051 lb per MMBtu of heat input; or (0.0011 lb per MMBtu of heat input). 0.052; or (0.0012) 0.71 or (0.016)

9. Dutch Ovens/Pile burners designed to burn biomass/bio-based solid CO 810 ppm by volume on a dry basis corrected to 3 percent oxygen, 3-run average. 0.89 8.9

PM (or TSM) 0.036 lb per MMBtu of heat input; or (2.4E-04 lb per MMBtu of heat input). 0.050 or (3.4E-04) 0.51 or (0.0034)Subcategory Pollutant MACT (heat inputbased) proposed

emission limits Outputbased emission

limits ( lb per MMBtu of
steam output) Outputbased emission

limits ( lb per Mwh) 10. Fuel cell units designed to burn biomass/ bio-based solid CO 1,500 ppm by volume on a dry basis corrected to 3 percent oxygen. 3.2 17

PM (or TSM) 0.033 lb per MMBtu of heat input; or (4.9E-05 lb per MMBtu of heat input). 0.090; or (1.4E-04) 0.46 or (6.9E-04)

11. Hybrid suspension grate units designed to burn biomass/ bio-based solid CO 3,900 ppm by volume on a dry basis corrected to 3 percent oxygen, 3- run average. 3.9 43

PM (or TSM) 0.44 lb per MMBtu of heat input; or (4.9E-04 lb per MMBtu of heat input). 0.55; or (6.2E-04) 6.2 or (0.0069)

12. Units designed to burn liquid fuel HCl 0.0012 lb per MMBtu of heat input. 0.0015 0.017

Mercury 2.6E-05 lb per MMBtu of heat input. 3.3E-05 3.6E-04

13. Units designed to burn heavy liquid fuel CO 10 ppm by volume on a dry basis corrected to 3 percent oxygen, 3-run average. 0.0091 0.11

PM 0.062 lb per MMBtu of heat input. 0.075 0.86

14. Units designed to burn light liquid fuel CO 7 ppm by volume on a dry basis corrected to 3 percent oxygen. 0.0071 0.076

PM 0.0034 lb per MMBtu of heat input. 0.0045 0.047

15. Units designed to burnliquid fuel located in noncontinental States and territories CO 18 ppm by volume on a dry basis corrected to 3 percent oxygen, 3-run average based on stack
test. 0.017 0.20

PM 0.0080 lb per MMBtu of heat input. 0.0097 0.11Subcategory Pollutant MACT (heat inputbased) proposed

emission limits Outputbased emission

limits ( lb per MMBtu of
steam output) Outputbased emission

limits ( lb per Mwh) 16. Units designed to burn gas 2 (other) gases CO 4 ppm corrected to 3 percent oxygen. 0.005 0.031

HCl 0.0017 lb per MMBtu of heat input. 0.0029 0.018

Mercury 7.9E-06 lb per MMBtu of heat input. 1.4E-05 8.3E-05

PM (or TSM) 0.0067 lb per MMBtu of heat input or (2.4E-04 lb per MMBtu of heat input). 0.012; or (4.0E-04) 0.070 or (0.0025)

### Appendix B

Output-Based Emission Limits for New Boilers and Process HeatersSummary of Calculated Output-Based (MACT Floor) Limits for New Boilers and Process Heaters at Major Sources (Units with heat in put capacity of 10 million Btu per hour or greater)

Subcategory Pollutant MACT (heat inputbased) proposed

emission limits Outputbased emission

limits ( lb per MMBtu of
steam output) Outputbased emission

limits ( lb per Mwh) 1. Solid fuel HCl 0.022 lb per MMBtu of heat input. 0.025 A 0.28

Mercury 8.60E-07 lb per MMBtu of heat input. 9.4E-07 1.1 E-05

2. Pulverized coal boilers designed to burn coal/solid fossil fuel CO 9 ppm by volume on a dry basis corrected to 3 percent oxygen, 3-run average. 0.0074 0.092

PM (or TSM) 0.0013 lb per MMBtu of heat input; or (2.8E-05 lb per MMBtu of heat input). 0.0013 or (2.8E-05) 0.016 or (3.5E-04)

3. Stokers designed to burn coal/solid fossil fuel CO 19 ppm by volume on a dry basis corrected to 3 percent oxygen, 3-run average. 0.017 0.20

PM (or TSM) 0.028 lb per MMBtu of heat input; or (2.2E-05 lb per MMBtu of heat input). 0.028; or (3.0E-05) 0.35 or (2.7E-04)

4. Fluidized bed units designed to burn coal/solid fossil fuel CO 17 ppm by volume on a dry basis corrected to 3 percent oxygen, 3-run average. 0.015 0.18

PM (or TSM) 0.0011 lb per MMBtu of heat input; or (1.7E-05 lb per MMBtu of heat input). 0.0012; or (1.8E-05 A ) 0.014 or (2.1E-04)

5. Stokers/sloped grate/others designed to burn wet biomass fuel CO 590 ppm by volume on a dry basis corrected to 3 percent oxygen, 3-run average. 0.56 6.5Subcategory Pollutant MACT (heat inputbased) proposed

emission limits Outputbased emission

limits ( lb per MMBtu of
steam output) Outputbased emission

limits ( lb per Mwh) PM (or TSM) 0.029 lb per MMBtu of heat input; or (2.6E-05 lb per MMBtu of heat input). 0.034; or (2.7E-05) 0.41 or (3.7E-04)

6. Stokers/sloped grate/others designed to burn kiln-dried biomass fuel CO 250 ppm by volume on a dry basis corrected to 3 percent oxygen. 0.23 A 2.8

PM (or TSM) 0.32 lb per MMBtu of heat input; or (4.0E-03 lb per MMBtu of heat input). 0.37; or (0.0042) 4.5 or (0.056)

7. Fluidized bed units designed to burn biomass/bio-based solids CO 230 ppm by volume on a dry basis corrected to 3 percent oxygen, 3-run average. 0.22 2.6

PM (or TSM) 0.0098 lb per MMBtu of heat input; or (4.2E-05 lb per MMBtu of heat input). 0.012; or (5.4E-05) 0.14 or (5.9E-04)

8. Suspension burners designed to burn biomass/bio-based solids CO 58 ppm by volume on a dry basis corrected to 3 percent oxygen, 3-run average. 0.046 0.64

PM (or TSM) 0.051 lb per MMBtu of heat input; or (0.0011 lb per MMBtu of heat input). 0.052; or (0.0012) 0.71 or (0.016)

9. Dutch Ovens/Pile burners designed to burn biomass/bio-based solids CO 810 ppm by volume on a dry basis corrected to 3 percent oxygen, 3-run average. 0.89 A 8.9

PM (or TSM) 0.036 lb per MMBtu of heat input; or (4.1E-05 lb per MMBtu of heat input). 0.050 A ; or (5.5E-05) 0.51 or (5.8E-04)Subcategory Pollutant MACT (heat inputbased) proposed

emission limits Outputbased emission

limits ( lb per MMBtu of
steam output) Outputbased emission

limits ( lb per Mwh) 10. Fuel cell units designed to burn biomass/bio-based solids CO 210 ppm by volume on a dry basis corrected to 3 percent oxygen. 0.29 2.3

PM (or TSM) 0.011 lb per MMBtu of heat input; or (4.9E-05 lb per MMBtu of heat input). 0.03; or (8.6E-05) 0.16 or (6.9E-04)

11. Hybrid suspension grate boiler designed to burn biomass/bio-based solids CO 1,500 ppm by volume on a dry basis corrected to 3 percent oxygen, 3- run average. 1.8 17

PM (or TSM) 0.026 lb per MMBtu of heat input; or (4.9E-04 lb per MMBtu of heat input). 0.033; or (6.2E-04) 0.37 or (0.0069)

12. Units designed to burn liquid fuel HCl 0.0012 lb per MMBtu of heat input. 0.0013 0.017

Mercury 4.9E-07 lb per MMBtu of heat input. 5.4E-07 6.8E-06

13. Units designed to burn heavy liquid fuel CO 10 ppm by volume on a dry basis corrected to 3 percent oxygen, 3-run average; average). 0.0091 A 0.11

PM 0.013 lb per MMBtu of heat input. 0.015 0.18

14. Units designed to burn light liquid fuel CO 3 ppm by volume on a dry basis corrected to 3 percent oxygen. 0.0031 0.033

PM 0.0011 lb per MMBtu of heat input for light liquid. 0.0015 0.016

15. Units designed to burnliquid fuel located in noncontinental States and territories CO 18 ppm by volume on a dry basis corrected to 3 percent oxygen, 3-run average based on stack
test. 0.017 A 0.20

PM 0.0080 lb per MMBtu of heat input. 0.0087 0.11Subcategory Pollutant MACT (heat inputbased) proposed

emission limits Outputbased emission

limits ( lb per MMBtu of
steam output) Outputbased emission

limits ( lb per Mwh) 16. Units designed to burn gas 2 (other) gases CO 4 ppm by volume on a dry basis corrected to 3 percent oxygen. 0.0050 0.031

HCl 0.0017 lb per MMBtu of heat input. 0.0029 0.018

Mercury 7.9E-06 lb per MMBtu of heat input. 1.4E-05 8.3E-05

PM (or TSM) 0.0067 lb per MMBtu of heat input; or (2.4E-04 lb per MMBtu of heat input). 0.012 or (4.0E-04) 0.070 or (0.0025)

A Calculated output-based limit for new sources was less-stringent than output-based limit for existing sources for the same subcategory. Ou tput-based limit was defaulted to the existing source limit.APPENDIX C

BEST PERFORMING UNITS AND HEAT RATE DATA

(See Excel Spreadsheet)APPENDIX D

OUTPUT INFO FOR BEST PERFORMING UNITS

(See Excel Spreadsheet)