Clean Air Act: Acid rain program— Continuous emission monitoring; sulfur dioxide, nitrogen oxide, and carbon dioxide emissions monitoring and reporting provisions,

[Federal Register: May 26, 1999 (Volume 64, Number 101)]

[Rules and Regulations]

[Page 28663-28672]

From the Federal Register Online via GPO Access [wais.access.gpo.gov]

[DOCID:fr26my99-21]

[[pp. 28663-28672]] Acid Rain Program; Continuous Emission Monitoring Rule Revisions

[[Continued from page 28662]]

[[Page 28663]]

results of a required sample of sulfur content, GCV or density is missing or invalid in the current calendar year. The substitute data value(s) shall be used until the next valid sample for the missing parameter(s) is obtained. Note that only actual sample results shall be used to determine the ``highest value from the previous year'' when that reporting option is used; missing data values shall not be used in the determination.

Table D-6.--Missing Data Substitution Procedures for Sulfur, Density, and Gross Calorific Value Data

Missing data substitution maximum Parameter

potential value

Oil Sulfur Content........... 3.5 percent for residual oil, or 1.0 percent for diesel fuel. Oil Density.................. 8.5 lb/gal for residual oil, or 7.4 lb/gal for diesel fuel. Oil GCV...................... 19,500 Btu/lb for residual oil, or 20,000 Btu/lb for diesel fuel. Gas Sulfur Content........... 0.3 gr/100 scf for pipeline natural gas, or 1.0 gr/100 scf for natural gas, or Twice the highest total sulfur content value recorded in the previous 30 days when sampling gaseous fuel daily or hourly. Gas GCV/Heat Content......... 1100 Btu/scf for pipeline natural gas, natural gas or landfill gas, or 1500 for butane or refinery gas. 2100 Btu/scf for propane or any other gaseous fuel.

2.4.2 Whenever data are missing from any fuel flowmeter that is part of an excepted monitoring system under appendix D or E to this part, where the fuel flowmeter data are required to determine the amount of fuel combusted by the unit, use the procedures in sections 2.4.2.2 and 2.4.2.3 of this appendix to account for the flow rate of fuel combusted at the unit for each hour during the missing data period. In addition, a fuel flowmeter used for measuring fuel combusted by a peaking unit may use the simplified fuel flow missing data procedure in section 2.4.2.1 of this appendix.

2.4.2.1 Simplified Fuel Flow Missing Data for Peaking Units

If no fuel flow rate data are available for a fuel flowmeter system installed on a peaking unit (as defined in Sec. 72.2 of this chapter), then substitute for each hour of missing data using the maximum potential fuel flow rate. The maximum potential fuel flow rate is the lesser of the following:

(a) The maximum fuel flow rate the unit is capable of combusting or (b) the maximum flow rate that the flowmeter can measure (i.e, upper range value of flowmeter leading to a unit).

2.4.2.2 * * *

2.4.2.3 For hours where two or more fuels are combusted, substitute the maximum hourly fuel flow rate measured and recorded by the flowmeter (or flowmeters, where fuel is recirculated) for the fuel for which data are missing at the corresponding load range recorded for each missing hour during the previous 720 hours when the unit combusted that fuel with any other fuel. For hours where no previous recorded fuel flow rate data are available for that fuel during the missing data period, calculate and substitute the maximum potential flow rate of that fuel for the unit as defined in section 2.4.2.2 of this appendix.

2.4.3 * * *

66. Appendix D to part 75 is further amended by:

    1. Revising sections 3 through 3.2.1 and 3.2.3;

    2. Removing section 3.2.4;

    3. Revising sections 3.3 through 3.3.3;

    4. Redesignating section 3.4 as 3.6 and revising the first sentence; and

    5. Adding new sections 3.4 through 3.4.3 and sections 3.5 through 3.5.6 to read as follows:

3. Calculations

   Calculate hourly SO‹INF›2‹/INF› mass emission rate from combustion of oil fuel using the procedures in section 3.1 of this appendix. Calculate hourly SO‹INF›2‹/INF› mass emission rate from combustion of gaseous fuel using the procedures in section 3.3 of this appendix. (Note: the SO‹INF›2‹/INF› mass emission rates in sections 3.1 and 3.3 are calculated such that the rate, when multiplied by unit operating time, yields the hourly SO‹INF›2‹/INF› mass emissions for a particular fuel for the unit.) Calculate hourly heat input rate for both oil and gaseous fuels using the procedures in section 3.4 of this appendix. Calculate total SO‹INF›2‹/INF› mass emissions and heat input for each hour, each quarter and the year to date using the procedures under section 3.5 of this appendix. Where an oil flowmeter records volumetric flow rate, use the calculation procedures in section 3.2 of this appendix to calculate the mass flow rate of oil.

   3.1 SO‹INF›2‹/INF› Mass Emission Rate Calculation for Oil

   3.1.1 Use Equation D-2 to calculate SO‹INF›2‹/INF› mass emission rate per hour (lb/hr):

   [GRAPHIC] [TIFF OMITTED] TR26MY99.021

   Where:

   SO‹INF›2rate-oil‹/INF› = Hourly mass emission rate of SO‹INF›2‹/INF› emitted from combustion of oil, lb/hr.

   OIL‹INF›rate‹/INF› = Mass rate of oil consumed per hr during combustion, lb/hr.

   %S‹INF›oil‹/INF› = Percentage of sulfur by weight measured in the sample.

   2.0 = Ratio of lb SO ‹INF›2‹/INF›/lb S.

   3.1.2 Record the SO‹INF›2‹/INF› mass emission rate from oil for each hour that oil is combusted.

   3.2 Mass Flow Rate Calculation for Volumetric Oil Flowmeters

   3.2.1 Where the oil flowmeter records volumetric flow rate rather than mass flow rate, calculate and record the oil mass flow rate for each hourly period using hourly oil flow rate measurements and the density or specific gravity of the oil sample. * * * * *

   3.2.3 Where density of the oil is determined by the applicable ASTM procedures from section 2.2.6 of this appendix, use Equation D- 3 to calculate the rate of the mass of oil consumed (in lb/hr):

   [GRAPHIC] [TIFF OMITTED] TR26MY99.022

   Where:

   OIL‹INF›rate‹/INF› = Mass rate of oil consumed per hr, lb/hr.

   V‹INF›oil-rate‹/INF› = Volume rate of oil consumed per hr, measured in scf/hr, gal/hr, barrels/hr, or m \3\/hr. D‹INF›oil‹/INF› = Density of oil, measured in lb/scf, lb/gal, lb/ barrel, or lb/m‹SUP›3‹/SUP›.

   3.3 SO‹INF›2‹/INF› Mass Emission Rate Calculation for Gaseous Fuels

   3.3.1 Use Equation D-4 to calculate the SO‹INF›2‹/INF› mass emission rate when using the optional gas sampling and analysis procedures in sections 2.3.1 and 2.3.2 of this appendix, or the required gas sampling and analysis procedures in section 2.3.3 of this appendix. Total sulfur content of a fuel must be determined using the procedures of 2.3.3.1.2 of this appendix:

   [[Page 28664]]

   [GRAPHIC] [TIFF OMITTED] TR26MY99.023

   Where:

   SO‹INF›2‹/INF›‹INF›rate-gas‹/INF› = Hourly mass rate of SO‹INF›2‹/INF› emitted due to combustion of gaseous fuel, lb/hr. GAS‹INF›rate‹/INF› = Hourly metered flow rate of gaseous fuel combusted, 100 scf/hr. S‹INF›gas‹/INF› = Sulfur content of gaseous fuel, in grain/100 scf. 2.0 = Ratio of lb SO‹INF›2‹/INF›/lb S. 7000 = Conversion of grains/100 scf to lb/100 scf.

   3.3.2 Use Equation D-5 to calculate the SO‹INF›2‹/INF› mass emission rate when using a default emission rate from section 2.3.1.1 or 2.3.2.1.1 of this appendix:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.024

   where:

   SO‹INF›2‹/INF›‹INF›rate‹/INF› = Hourly mass emission rate of SO‹INF›2‹/INF› from combustion of a gaseous fuel, lb/hr. ER = SO‹INF›2‹/INF› emission rate from section 2.3.1.1 or 2.3.2.1.1, of this appendix, lb/mmBtu. HI‹INF›rate‹/INF› = Hourly heat input rate of a gaseous fuel, calculated using procedures in section 3.4.1 of this appendix, in mmBtu/hr.

   3.3.3 Record the SO‹INF›2‹/INF› mass emission rate for each hour when the unit combusts a gaseous fuel.

   3.4 Calculation of Heat Input Rate

   3.4.1 Heat Input Rate for Gaseous Fuels

   (a) Determine total hourly gas flow or average hourly gas flow rate with a fuel flowmeter in accordance with the requirements of section 2.1 of this appendix and the fuel GCV in accordance with the requirements of section 2.3.4 of this appendix. If necessary perform the 720-hour test under section 2.3.5 to determine the appropriate fuel GCV sampling frequency.

   (b) Then, use Equation D-6 to calculate heat input rate from gaseous fuels for each hour.

   [GRAPHIC] [TIFF OMITTED] TR26MY99.025

   Where:

   HI‹INF›rate-gas ‹/INF›= Hourly heat input rate from combustion of the gaseous fuel, mmBtu/hr. GAS‹INF›rate‹/INF› = Average volumetric flow rate of fuel, for the portion of the hour in which the unit operated, 100 scf/hr. GCV‹INF›gas‹/INF› = Gross calorific value of gaseous fuel, Btu/hr. 10 \6\ = Conversion of Btu to mmBtu.

   (c) Note that when fuel flow is measured on an hourly totalized basis (e.g. a fuel flowmeter reports totalized fuel flow for each hour), before Equation D-6 can be used, the total hourly fuel usage must be converted from units of 100 scf to units of 100 scf/hr using Equation D-7:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.026

   Where:

   GAS‹INF›rate‹/INF› = Average volumetric flow rate of fuel for the portion of the hour in which the unit operated, 100 scf/hr. GAS‹INF›unit‹/INF› = Total fuel combusted during the hour, 100 scf. t = Unit operating time, hour or fraction of an hour (in equal increments that can range from one hundredth to one quarter of an hour, at the option of the owner or operator).

   3.4.2 Heat Input Rate From the Combustion of Oil

   (a) Determine total hourly oil flow or average hourly oil flow rate with a fuel flowmeter, in accordance with the requirements of section 2.1 of this appendix. Determine oil GCV according to the requirements of section 2.2 of this appendix.

   Then, use Equation D-8 to calculate hourly heat input rate from oil for each hour:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.027

   Where:

   HI‹INF›rate-oil‹/INF› = Hourly heat input rate from combustion of oil, mmBtu/hr. OIL‹INF›rate‹/INF› = Mass rate of oil consumed per hour, as determined using procedures in section 3.2.3 of this appendix, in lb/hr, tons/hr, or kg/hr. GCV‹INF›oil‹/INF› = Gross calorific value of oil, Btu/lb, Btu/ton, Btu/kg. 10‹SUP›6‹/SUP› = Conversion of Btu to mmBtu.

   (b) Note that when fuel flow is measured on an hourly totalized basis (e.g., a fuel flowmeter reports totalized fuel flow for each hour), before equation D-8 can be used, the total hourly fuel usage must be converted from units of lb to units of lb/hr, using equation D-9:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.028

   Where:

   OIL‹INF›rate‹/INF› = Average fuel flow rate for the portion of the hour which the unit operated in lb/hr.

   OIL‹INF›unit‹/INF› = Total fuel combusted during the hour, lb. t = Unit operating time, hour or fraction of an hour (in equal increments that can range from one hundredth to one quarter of an hour, at the option of the owner or operator).

   3.4.3 Apportioning Heat Input Rate to Multiple Units

   (a) Use the procedure in this section to apportion hourly heat input rate to two or more units using a single fuel flowmeter which supplies fuel to the units. (This procedure is not applicable to units calculating NO‹INF›X‹/INF› mass emissions using the provisions of subpart H of this part.) The designated representative may also petition the Administrator under Sec. 75.66 to use this apportionment procedure to calculate SO‹INF›2‹/INF› and CO‹INF›2‹/INF› mass emissions.

   (b) Determine total hourly fuel flow or flow rate through the fuel flowmeter supplying gas or oil fuel to the units. Convert fuel flow rates to units of 100 scf for gaseous fuels or to lb for oil, using the procedures of this appendix. Apportion the fuel to each unit separately based on hourly output of the unit in MW‹INF›e‹/INF› or 1000 lb of steam/hr (klb/hr) using Equation D-10 or D-11, as applicable:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.029

   Where:

   GAS‹INF›unit‹/INF› = Gas flow apportioned to a unit, 100 scf. GAS‹INF›meter‹/INF› = Total gas flow through the fuel flowmeter, 100 scf. U‹INF›output‹/INF› = Total unit output, MW or klb/hr.

   [[Page 28665]]

   [GRAPHIC] [TIFF OMITTED] TR26MY99.030

   Where:

   OIL‹INF›unit‹/INF› = Oil flow apportioned to a unit, lb. OIL‹INF›meter‹/INF› = Total oil flow through the fuel flowmeter, lb. U‹INF›output‹/INF› = Total unit output in either MW‹INF›e‹/INF› or klb/hr.

   (c) Use the total apportioned fuel flow calculated from Equation D-10 or D-11 to calculate the hourly unit heat input rate, using Equations D-6 and D-7 (for gas) or Equations D-8 and D-9 (for oil).

   3.5 Conversion of Hourly Rates to Hourly, Quarterly and Year to Date Totals

   3.5.1 Hourly SO‹INF›2‹/INF› Mass Emissions From the Combustion of All Fuels

   Determine the total mass emissions for each hour from the combustion of all fuels using Equation D-12:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.031

   Where:

   M‹INF›SO2-hr‹/INF› = Total mass of SO‹INF›2‹/INF› emissions from all fuels combusted during the hour, lb. SO‹INF›2rate-i‹/INF› = SO‹INF›2‹/INF› mass emission rate for each type of gas or oil fuel combusted during the hour, lb/hr. t‹INF›i‹/INF› = Time each gas or oil fuel was combusted for the hour (fuel usage time), fraction of an hour (in equal increments that can range from one hundredth to one quarter of an hour, at the option of the owner or operator).

   3.5.2 Quarterly Total SO‹INF›2‹/INF› Mass Emissions

   Sum the hourly SO‹INF›2‹/INF› mass emissions in lb as determined from Equation D-12 for all hours in a quarter using Equation D-13:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.032

   Where:

   M‹INF›SO2-qtr‹/INF› = Total mass of SO‹INF›2‹/INF› emissions from all fuels combusted during the quarter, tons. M‹INF›SO2-hr‹/INF› = Hourly SO‹INF›2‹/INF› mass emissions determined using Equation D-12, lb. 2000= Conversion factor from lb to tons.

   3.5.3 Year to Date SO‹INF›2‹/INF› Mass Emissions

   Calculate and record SO‹INF›2‹/INF› mass emissions in the year to date using Equation D-14:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.033

   Where:

   M‹INF›SO2-YTD‹/INF› = Total SO‹INF›2‹/INF› mass emissions for the year to date, tons. M‹INF›SO2-qtr‹/INF› = Total SO‹INF›2‹/INF› mass emissions for the quarter, tons.

   3.5.4 Hourly Total Heat Input from the Combustion of all Fuels

   Determine the total heat input in mmBtu for each hour from the combustion of all fuels using Equation D-15:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.034

   Where:

   HI‹INF›hr‹/INF› = Total heat input from all fuels combusted during the hour, mmBtu. HI‹INF›rate-i‹/INF› =Heat input rate for each type of gas or oil combusted during the hour, mmBtu/hr. t‹INF›i‹/INF› = Time each gas or oil fuel was combusted for the hour (fuel usage time), fraction of an hour (in equal increments that can range from one hundredth to one quarter of an hour, at the option of the owner or operator).

   3.5.5 Quarterly Heat Input

   Sum the hourly heat input values determined from equation D-15 for all hours in a quarter using Equation D-16:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.035

   Where:

   HI‹INF›qtr‹/INF› = Total heat input from all fuels combusted during the quarter, mmBtu. HI‹INF›hr‹/INF› = Hourly heat input determined using Equation D-15, mmBtu.

   3.5.6 Year-to-Date Heat Input

   Calculate and record the total heat input in the year to date using Equation D-17.

   [GRAPHIC] [TIFF OMITTED] TR26MY99.036

   HI‹INF›YTD‹/INF› = Total heat input for the year to date, mmBtu. HI‹INF›qtr‹/INF› = Total heat input for the quarter, mmBtu.

   3.6 Records and Reports

   Calculate and record quarterly and cumulative SO‹INF›2‹/INF› mass emissions and heat input for each calendar quarter using the procedures and equations of section 3.5 of this appendix. * * *

67. Appendix E to part 75 is amended by revising sections 2.4.2, 2.4.3, 2.4.4, 2.5.4 and 2.5.5 to read as follows:

    Appendix E to Part 75--Optional NO‹INF›X‹/INF› Emissions Estimation Protocol for Gas-Fired Peaking Units and Oil-Fired Peaking Units

    * * * * *

2. Procedure

   * * * * *

   2.4 Procedures for Determining Hourly NO‹INF›X‹/INF› Emission Rate

   * * * * *

   2.4.2 Use the graph of the baseline correlation results (appropriate for the fuel or fuel combination) to determine the NO‹INF›X‹/INF› emissions rate (lb/mmBtu) corresponding to the heat input rate (mmBtu/hr). Input this correlation into the data acquisition and handling system for the unit. Linearly interpolate to 0.1 mmBtu/hr heat input rate and 0.01 lb/mmBtu NO‹INF›X‹/INF› (0.001 lb/mmBtu NO‹INF›X‹/INF› after April 1, 2000). For each type of fuel, calculate NO‹INF›X‹/INF› emission rate using the baseline correlation results from the most recent test with that fuel, beginning with the date and hour of the completion of the most recent test.

   2.4.3 To determine the NO‹INF›X‹/INF› emission rate for a unit co-firing fuels that has not been tested for that combination of fuels, interpolate between the NO‹INF›X‹/INF› emission rate for each fuel as follows. Determine the heat input rate for the hour (in mmBtu/hr) for each fuel and select the corresponding NO‹INF›X‹/INF› emission rate for each fuel on the appropriate graph. (When a fuel is combusted for a partial

   [[Page 28666]]

   hour, determine the fuel usage time for each fuel and determine the heat input rate from each fuel as if that fuel were combusted at that rate for the entire hour in order to select the corresponding NO‹INF›X‹/INF› emission rate.) Calculate the total heat input to the unit in mmBtu for the hour from all fuel combusted using Equation E- 1. Calculate a Btu-weighted average of the emission rates for all fuels using Equation E-2 of this appendix. For each type of fuel, calculate NO‹INF›X‹/INF› emission rate using the baseline correlation results from the most recent test with that fuel, beginning with the date and hour of the completion of the most recent test.

   2.4.4 For each hour, record the critical quality assurance parameters, as identified in the monitoring plan, and as required by section 2.3 of this appendix from the date and hour of the completion of the most recent test for each type of fuel.

   2.5 Missing Data Procedures

   * * * * *

   2.5.4 Substitute missing data from a fuel flowmeter using the procedures in section 2.4.2 of appendix D to this part.

   2.5.5 Substitute missing data for gross calorific value of fuel using the procedures in sections 2.4.1 of appendix D to this part.

68. Appendix E to part 75 is further amended by revising sections 3.1, 3.3.1, and 3.3.4 to read as follows:

3. Calculations

   3.1 Heat Input

   Calculate the total heat input by summing the product of heat input rate and fuel usage time of each fuel, as in the following equation:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.037

   Where:

   H‹INF›T‹/INF› = Total heat input of fuel flow or a combination of fuel flows to a unit, mmBtu. HI‹INF›fuel 1,2,3,...last‹/INF› = Heat input rate from each fuel, in mmBtu/hr as determined using Equation F-19 or F-20 in section 5.5 of appendix F to this part, mmBtu/hr. t‹INF›1,2,3....last‹/INF› = Fuel usage time for each fuel (rounded up to the nearest fraction of an hour (in equal increments that can range from one hundredth to one quarter of an hour, at the option of the owner or operator)). * * * * *

   3.3 * * *

   3.3.1 Conversion from Concentration to Emission Rate

   Convert the NO‹INF›X‹/INF› concentrations (ppm) and O‹INF›2‹/INF› concentrations to NO‹INF›X‹/INF› emission rates (to the nearest 0.01 lb/mmBtu for tests performed prior to April 1, 2000, or to the nearest 0.001 lb/mmBtu for tests performed on and after April 1, 2000), according to the appropriate one of the following equations: F-5 in appendix F to this part for dry basis concentration measurements or 19-3 in Method 19 of appendix A to part 60 of this chapter for wet basis concentration measurements. * * * * *

   3.3.4 Average NO‹INF›X‹/INF› Emission Rate During Co-firing of Fuels

   [GRAPHIC] [TIFF OMITTED] TR26MY99.038

   Where:

   E‹INF›h‹/INF› = NO‹INF›X‹/INF› emission rate for the unit for the hour, lb/mmBtu. E‹INF›f‹/INF› = NO‹INF›X‹/INF› emission rate for the unit for a given fuel at heat input rate HI‹INF›f‹/INF›, lb/mmBtu. HI‹INF›f‹/INF› = Heat input rate for the hour for a given fuel, during the fuel usage time, as determined using Equation F-19 or F- 20 in section 5.5 of appendix F to this part, mmBtu/hr. H‹INF›T‹/INF› = Total heat input for all fuels for the hour from Equation E-1. t‹INF›f‹/INF› = Fuel usage time for each fuel (rounded up to the nearest fraction of an hour (in equal increments that can range from one hundredth to one quarter of an hour, at the option of the owner or operator)).

   Note: For hours where a fuel is combusted for only part of the hour, use the fuel flow rate or mass flow rate during the fuel usage time, instead of the total fuel flow or mass flow during the hour, when calculating heat input rate using Equation F-19 or F-20.

69. Appendix F to part 75 is amended by revising sections 2, 2.1, 2.2, 2.3, and 2.4 to read as follows:

    Appendix F to Part 75--Conversion Procedures

    * * * * *

2. Procedures for SO‹INF›2‹/INF› Emissions

   Use the following procedures to compute hourly SO‹INF›2‹/INF› mass emission rate (in lb/hr) and quarterly and annual SO‹INF›2‹/INF› total mass emissions (in tons). Use the procedures in Method 19 in appendix A to part 60 of this chapter to compute hourly SO‹INF›2‹/INF› emission rates (in lb/mmBtu) for qualifying Phase I technologies. When computing hourly SO‹INF›2‹/INF› emission rate in lb/mmBtu, a minimum concentration of 5.0 percent CO‹INF›2‹/INF› and a maximum concentration of 14.0 percent O‹INF›2‹/INF› may be substituted for measured diluent gas concentration values at boilers during hours when the hourly average concentration of CO‹INF›2‹/INF› is less than 5.0 percent CO‹INF›2‹/INF› or the hourly average concentration of O‹INF›2‹/INF› is greater than 14.0 percent O‹INF›2‹/INF›.

   2.1 When measurements of SO‹INF›2‹/INF› concentration and flow rate are on a wet basis, use the following equation to compute hourly SO‹INF›2‹/INF› mass emission rate (in lb/hr):

   [GRAPHIC] [TIFF OMITTED] TR26MY99.039

   Where:

   E‹INF›h‹/INF› = Hourly SO‹INF›2‹/INF› mass emission rate during unit operation, lb/hr. K = 1.660 x 10‹SUP›-7‹/SUP› for SO‹INF›2‹/INF›, (lb/scf)/ppm. C‹INF›h‹/INF› = Hourly average SO‹INF›2‹/INF› concentration during unit operation, stack moisture basis, ppm. Q‹INF›h‹/INF› = Hourly average volumetric flow rate during unit operation, stack moisture basis, scfh. 2.2 When measurements by the SO‹INF›2‹/INF› pollutant concentration monitor are on a dry basis and the flow rate monitor measurements are on a wet basis, use the following equation to compute hourly SO‹INF›2‹/INF› mass emission rate (in lb/hr):

   [GRAPHIC] [TIFF OMITTED] TR26MY99.040

   where:

   E‹INF›h‹/INF› = Hourly SO‹INF›2‹/INF› mass emission rate during unit operation, lb/hr. K = 1.660 x 10‹SUP›-7‹/SUP› for SO‹INF›2‹/INF›, (lb/scf)/ppm. C‹INF›hp‹/INF› = Hourly average SO‹INF›2‹/INF› concentration during unit operation, ppm (dry). Q‹INF›hs‹/INF› = Hourly average volumetric flow rate during unit operation, scfh as measured (wet). %H‹INF›2‹/INF›O = Hourly average stack moisture content during unit operation, percent by volume.

   2.3 Use the following equations to calculate total SO‹INF›2‹/INF› mass emissions for each calendar quarter (Equation F- 3) and for each calendar year (Equation F-4), in tons:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.041

   Where: E‹INF›q‹/INF› = Quarterly total SO‹INF›2‹/INF› mass emissions, tons. E‹INF›h‹/INF› = Hourly SO‹INF›2‹/INF› mass emission rate, lb/hr.

   [[Page 28667]]

   t‹INF›h‹/INF› = Unit operating time, hour or fraction of an hour (in equal increments that can range from one hundredth to one quarter of an hour, at the option of the owner or operator). n = Number of hourly SO‹INF›2‹/INF› emissions values during calendar quarter. 2000 = Conversion of 2000 lb per ton.

   [GRAPHIC] [TIFF OMITTED] TR26MY99.042

   Where:

   E‹INF›a‹/INF› = Annual total SO‹INF›2‹/INF› mass emissions, tons. E‹INF›q‹/INF› = Quarterly SO‹INF›2‹/INF› mass emissions, tons. q = Quarters for which E‹INF›q‹/INF› are available during calendar year.

   2.4 Round all SO‹INF›2‹/INF› mass emission rates and totals to the nearest tenth.

70. Appendix F to part 75 is further amended by revising sections 3.3.2, 3.3.3, 3.3.4, 3.4, and 3.5 to read as follows:

3. Procedures for NO‹INF›X‹/INF› Emission Rate

   * * * * *

   3.3 * * *

   3.3.2 E = Pollutant emissions during unit operation, lb/mmBtu. 3.3.3 C‹INF›h‹/INF› = Hourly average pollutant concentration during unit operation, ppm. 3.3.4 %O‹INF›2‹/INF›, %CO‹INF›2‹/INF› = Oxygen or carbon dioxide volume during unit operation (expressed as percent O‹INF›2‹/INF› or CO‹INF›2‹/INF›). A minimum concentration of 5.0 percent CO‹INF›2‹/INF› and a maximum concentration of 14.0 percent O‹INF›2‹/INF› may be substituted for measured diluent gas concentration values at boilers during hours when the hourly average concentration of CO‹INF›2‹/INF› is ‹ 5.0 percent CO‹INF›2‹/INF› or the hourly average concentration of O‹INF›2‹/INF› is › 14.0 percent O‹INF›2‹/INF›. A minimum concentration of 1.0 percent CO‹INF›2‹/INF› and a maximum concentration of 19.0 percent O‹INF›2‹/INF› may be substituted for measured diluent gas concentration values at stationary gas turbines during hours when the hourly average concentration of CO‹INF›2‹/INF› is ‹ 1.0 percent CO‹INF›2‹/INF› or the hourly average concentration of O‹INF›2‹/INF› is › 19.0 percent O‹INF›2‹/INF›. * * * * *

   3.4 Use the following equations to calculate the average NO‹INF›X‹/INF› emission rate for each calendar quarter (Equation F- 9) and the average emission rate for the calendar year (Equation F- 10), in lb/mmBtu:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.043

   Where:

   E‹INF›q‹/INF› = Quarterly average NO‹INF›X‹/INF› emission rate, lb/ mmBtu. E‹INF›i‹/INF› = Hourly average NO‹INF›X‹/INF› emission rate during unit operation, lb/mmBtu. n = Number of hourly rates during calendar quarter.

   [GRAPHIC] [TIFF OMITTED] TR26MY99.044

   Where:

   E‹INF›a‹/INF› = Average NO‹INF›X‹/INF› emission rate for the calendar year, lb/mmBtu. E‹INF›i‹/INF› = Hourly average NO‹INF›X‹/INF› emission rate during unit operation, lb/mmBtu. m = Number of hourly rates for which E‹INF›i‹/INF› is available in the calendar year.

   3.5 Round all NO‹INF›X‹/INF› emission rates to the nearest 0.01 lb/mmBtu prior to April 1, 2000, and to the nearest 0.001 lb/mmBtu on and after April 1, 2000.

71. Appendix F to part 75 is further amended by revising sections 4.1, 4.2, 4.3, 4.4, and 4.4.1 to read as follows:

4. Procedures for CO‹INF›2‹/INF› Mass Emissions

   * * * * *

   4.1 When CO‹INF›2‹/INF› concentration is measured on a wet basis, use the following equation to calculate hourly CO‹INF›2‹/INF› mass emissions rates (in tons/hr):

   [GRAPHIC] [TIFF OMITTED] TR26MY99.045

   Where:

   E‹INF›h‹/INF› = Hourly CO‹INF›2‹/INF› mass emission rate during unit operation, tons/hr. K = 5.7 X 10‹SUP›-7‹/SUP› for CO‹INF›2‹/INF›, (tons/scf) / %CO‹INF›2‹/INF›. C‹INF›h‹/INF› = Hourly average CO‹INF›2‹/INF› concentration during unit operation, wet basis, percent CO‹INF›2‹/INF›. For boilers, a minimum concentration of 5.0 percent CO‹INF›2‹/INF› may be substituted for the measured concentration when the hourly average concentration of CO‹INF›2‹/INF› is ‹ 5.0 percent CO‹INF›2‹/INF›, provided that this minimum concentration of 5.0 percent CO‹INF›2‹/INF› is also used in the calculation of heat input for that hour. For stationary gas turbines, a minimum concentration of 1.0 percent CO‹INF›2‹/INF› may be substituted for measured diluent gas concentration values during hours when the hourly average concentration of CO‹INF›2‹/INF› is ‹ 1.0 percent CO‹INF›2‹/INF›, provided that this minimum concentration of 1.0 percent CO‹INF›2‹/INF› is also used in the calculation of heat input for that hour. Q‹INF›h‹/INF› = Hourly average volumetric flow rate during unit operation, wet basis, scfh.

   4.2 When CO‹INF›2‹/INF› concentration is measured on a dry basis, use Equation F-2 to calculate the hourly CO‹INF›2‹/INF› mass emission rate (in tons/hr) with a K-value of 5.7 x 10‹SUP›-7‹/SUP› (tons/scf) percent CO‹INF›2‹/INF›, where E‹INF›h‹/INF› = hourly CO‹INF›2‹/INF› mass emission rate, tons/hr and C‹INF›hp‹/INF› = hourly average CO‹INF›2‹/INF› concentration in flue, dry basis, percent CO‹INF›2‹/INF›.

   4.3 Use the following equations to calculate total CO‹INF›2‹/INF› mass emissions for each calendar quarter (Equation F- 12) and for each calendar year (Equation F-13):

   [GRAPHIC] [TIFF OMITTED] TR26MY99.046

   Where:

   E‹INF›CO2q‹/INF› = Quarterly total CO‹INF›2‹/INF› mass emissions, tons. E‹INF›h‹/INF› = Hourly CO‹INF›2‹/INF› mass emission rate, tons/hr. t‹INF›h‹/INF›=Unit operating time, in hours or fraction of an hour (in equal increments that can range from one hundredth to one quarter of an hour, at the option of the owner or operator). H‹INF›R‹/INF› = Number of hourly CO‹INF›2‹/INF› mass emission rates available during calendar quarter.

   [GRAPHIC] [TIFF OMITTED] TR26MY99.047

   Where:

   E‹INF›CO2a‹/INF› = Annual total CO‹INF›2‹/INF› mass emission, E‹INF›CO2q‹/INF› = Quarterly total CO‹INF›2‹/INF› mass emissions, tons. q = Quarters for which E‹INF›CO2q‹/INF› are available during calendar year.

   4.4 For an affected unit, when the owner or operator is continuously monitoring O‹INF›2‹/INF› concentration (in percent by volume) of flue gases using an O‹INF›2‹/INF› monitor, use the equations and procedures in section 4.4.1 and 4.4.2 of this appendix to determine hourly CO‹INF›2‹/INF› mass emissions (in tons).

   4.4.1 Use appropriate F and F‹INF›c‹/INF› factors from section 3.3.5 of this appendix in one of the following equations (as applicable) to determine hourly average CO‹INF›2‹/INF› concentration of flue gases (in percent by volume):

   [GRAPHIC] [TIFF OMITTED] TR26MY99.048

   [[Page 28668]]

   CO‹INF›2d‹/INF› = Hourly average CO‹INF›2‹/INF› concentration during unit operation, percent by volume, dry basis. F, F‹INF›c‹/INF› = F-factor or carbon-based F‹INF›c‹/INF›-factor from section 3.3.5 of this appendix. 20.9 = Percentage of O‹INF›2‹/INF› in ambient air. O‹INF›2d‹/INF› = Hourly average O‹INF›2‹/INF› concentration during unit operation, percent by volume, dry basis. For boilers, a maximum concentration of 14.0 percent O‹INF›2‹/INF› may be substituted for the measured concentration when the hourly average concentration of O‹INF›2‹/INF› is › 14.0 percent O‹INF›2‹/INF›, provided that this maximum concentration of 14.0 percent O‹INF›2‹/INF› is also used in the calculation of heat input for that hour. For stationary gas turbines, a maximum concentration of 19.0 percent O‹INF›2‹/INF› may be substituted for measured diluent gas concentration values during hours when the hourly average concentration of O‹INF›2‹/INF› is › 19.0 percent O‹INF›2‹/INF›, provided that this maximum concentration of 19.0 percent O‹INF›2‹/INF› is also used in the calculation of heat input for that hour.

   [GRAPHIC] [TIFF OMITTED] TR26MY99.061

   Where:

   CO‹INF›2w‹/INF› = Hourly average CO‹INF›2‹/INF› concentration during unit operation, percent by volume, wet basis. O‹INF›2w‹/INF› = Hourly average O‹INF›2‹/INF› concentration during unit operation, percent by volume, wet basis. For boilers, a maximum concentration of 14.0 percent O‹INF›2‹/INF› may be substituted for the measured concentration when the hourly average concentration of O‹INF›2‹/INF› is › 14.0 percent O‹INF›2‹/INF›, provided that this maximum concentration of 14.0 percent O‹INF›2‹/INF› is also used in the calculation of heat input for that hour. For stationary gas turbines, a maximum concentration of 19.0 percent O‹INF›2‹/INF› may be substituted for measured diluent gas concentration values during hours when the hourly average concentration of O‹INF›2‹/INF› is › 19.0 percent O‹INF›2‹/INF›, provided that this maximum concentration of 19.0 percent O‹INF›2‹/INF› is also used in the calculation of heat input for that hour. F, F‹INF›c‹/INF› = F-factor or carbon-based F‹INF›c‹/INF›-factor from section 3.3.5 of this appendix. 20.9 = Percentage of O‹INF›2‹/INF› in ambient air. %H‹INF›2‹/INF›O = Moisture content of gas in the stack, percent. * * * * *

72. Appendix F to part 75 is amended by revising sections 5 through 5.2.4; adding sections 5.3 through 5.3.2; revising sections 5.5, 5.5.1 and 5.5.2; and by adding new sections 5.6 through 5.6.2 and 5.7 and by removing and revising section 5.4 to read as follows:

5. Procedures for Heat Input

   Use the following procedures to compute heat input rate to an affected unit (in mmBtu/hr or mmBtu/day):

   5.1 Calculate and record heat input rate to an affected unit on an hourly basis, except as provided in sections 5.5 through 5.5.7. The owner or operator may choose to use the provisions specified in Sec. 75.16(e) or in section 2.1.2 of appendix D to this part in conjunction with the procedures provided in sections 5.6 through 5.6.2 to apportion heat input among each unit using the common stack or common pipe header.

   5.2 For an affected unit that has a flow monitor (or approved alternate monitoring system under subpart E of this part for measuring volumetric flow rate) and a diluent gas (O‹INF›2‹/INF› or CO‹INF›2‹/INF›) monitor, use the recorded data from these monitors and one of the following equations to calculate hourly heat input rate (in mmBtu/hr).

   5.2.1 When measurements of CO‹INF›2‹/INF› concentration are on a wet basis, use the following equation:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.049

   Where: HI = Hourly heat input rate during unit operation, mmBtu/hr. Q‹INF›w‹/INF› = Hourly average volumetric flow rate during unit operation, wet basis, scfh.

   F‹INF›c‹/INF› = Carbon-based F-factor, listed in section 3.3.5 of this appendix for each fuel, scf/mmBtu. %CO‹INF›2w‹/INF› = Hourly concentration of CO‹INF›2‹/INF› during unit operation, percent CO‹INF›2‹/INF› wet basis. For boilers, a minimum concentration of 5.0 percent CO‹INF›2‹/INF› may be substituted for the measured concentration when the hourly average concentration of CO‹INF›2‹/INF› is ‹ 5.0 percent CO‹INF›2‹/INF›, provided that this minimum concentration of 5.0 percent CO‹INF›2‹/INF› is also used in the calculation of CO‹INF›2‹/INF› mass emissions for that hour. For stationary gas turbines, a minimum concentration of 1.0 percent CO‹INF›2‹/INF› may be substituted for measured diluent gas concentration values during hours when the hourly average concentration of CO‹INF›2‹/INF› is ‹ 1.0 percent CO‹INF›2‹/INF›, provided that this minimum concentration of 1.0 percent CO‹INF›2‹/INF› is also used in the calculation of CO‹INF›2‹/INF› mass emissions for that hour.

   5.2.2 When measurements of CO‹INF›2‹/INF› concentration are on a dry basis, use the following equation:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.051

   [[Page 28669]]

   Where:

   HI = Hourly heat input rate during unit operation, mmBtu/hr. Q‹INF›h‹/INF› = Hourly average volumetric flow rate during unit operation, wet basis, scfh. F‹INF›c‹/INF› = Carbon-based F-Factor, listed in section 3.3.5 of this appendix for each fuel, scf/mmBtu. %CO‹INF›2d‹/INF› = Hourly concentration of CO‹INF›2‹/INF› during unit operation, percent CO‹INF›2‹/INF› dry basis. For boilers, a minimum concentration of 5.0 percent CO‹INF›2‹/INF› may be substituted for the measured concentration when the hourly average concentration of CO‹INF›2‹/INF› is ‹ 5.0 percent CO‹INF›2‹/INF›, provided that this minimum concentration of 5.0 percent CO‹INF›2‹/INF› is also used in the calculation of CO‹INF›2‹/INF› mass emissions for that hour. For stationary gas turbines, a minimum concentration of 1.0 percent CO‹INF›2‹/INF› may be substituted for measured diluent gas concentration values during hours when the hourly average concentration of CO‹INF›2‹/INF› is ‹ 1.0 percent CO‹INF›2‹/INF›, provided that this minimum concentration of 1.0 percent CO‹INF›2‹/INF› is also used in the calculation of CO‹INF›2‹/INF› mass emissions for that hour. %H‹INF›2‹/INF›O = Moisture content of gas in the stack, percent.

   5.2.3 When measurements of O‹INF›2‹/INF› concentration are on a wet basis, use the following equation:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.052

   Where:

   HI = Hourly heat input rate during unit operation, mmBtu/hr. Q‹INF›w‹/INF› = Hourly average volumetric flow rate during unit operation, wet basis, scfh.

   F = Dry basis F-factor, listed in section 3.3.5 of this appendix for each fuel, dscf/mmBtu. %O‹INF›2w‹/INF› = Hourly concentration of O‹INF›2‹/INF› during unit operation, percent O‹INF›2‹/INF› wet basis. For boilers, a maximum concentration of 14.0 percent O‹INF›2‹/INF› may be substituted for the measured concentration when the hourly average concentration of O‹INF›2‹/INF› is › 14.0 percent O‹INF›2‹/INF›, provided that this maximum concentration of 14.0 percent O‹INF›2‹/INF› is also used in the calculation of CO‹INF›2‹/INF› mass emissions for that hour. For stationary gas turbines, a maximum concentration of 19.0 percent O‹INF›2‹/INF› may be substituted for measured diluent gas concentration values during hours when the hourly average concentration of O‹INF›2‹/INF› is › 19.0 percent O‹INF›2‹/INF›, provided that this maximum concentration of 19.0 percent O‹INF›2‹/INF› is also used in the calculation of CO‹INF›2‹/INF› mass emissions for that hour. %H‹INF›2‹/INF›O = Hourly average stack moisture content, percent by volume.

   5.2.4 When measurements of O‹INF›2‹/INF› concentration are on a dry basis, use the following equation:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.053

   [[Page 28670]]

   Where:

   HI = Hourly heat input rate during unit operation, mmBtu/hr. Q‹INF›w‹/INF› = Hourly average volumetric flow during unit operation, wet basis, scfh.

   F = Dry basis F-factor, listed in section 3.3.5 of this appendix for each fuel, dscf/mmBtu. %H‹INF›2‹/INF›O = Moisture content of the stack gas, percent. %O‹INF›2d‹/INF› = Hourly concentration of O‹INF›2‹/INF› during unit operation, percent O‹INF›2‹/INF› dry basis. For boilers, a maximum concentration of 14.0 percent O‹INF›2‹/INF› may be substituted for the measured concentration when the hourly average concentration of O‹INF›2‹/INF› is › 14.0 percent O‹INF›2‹/INF›, provided that this maximum concentration of 14.0 percent O‹INF›2‹/INF› is also used in the calculation of CO‹INF›2‹/INF› mass emissions for that hour. For stationary gas turbines, a maximum concentration of 19.0 percent O‹INF›2‹/INF› may be substituted for measured diluent gas concentration values during hours when the hourly average concentration of O‹INF›2‹/INF› is › 19.0 percent O‹INF›2‹/INF›, provided that this maximum concentration of 19.0 percent O‹INF›2‹/INF› is also used in the calculation of CO‹INF›2‹/INF› mass emissions for that hour. 5.3 Heat Input Summation (for Heat Input Determined Using a Flow Monitor and Diluent Monitor)

   5.3.1 Calculate total quarterly heat input for a unit or common stack using a flow monitor and diluent monitor to calculate heat input, using the following equation:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.054

   Where:

   HI‹INF›q‹/INF› = Total heat input for the quarter, mmBtu. HI‹INF›i‹/INF› = Hourly heat input rate during unit operation, using Equation F-15, F-16, F-17, or F-18, mmBtu/hr. t‹INF›i‹/INF› = Hourly operating time for the unit or common stack, hour or fraction of an hour (in equal increments that can range from one hundredth to one quarter of an hour, at the option of the owner or operator).

   5.3.2 Calculate total cumulative heat input for a unit or common stack using a flow monitor and diluent monitor to calculate heat input, using the following equation:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.055

   Where:

   HI‹INF›c‹/INF› = Total heat input for the year to date, mmBtu. HI‹INF›q‹/INF› = Total heat input for the quarter, mmBtu.

   5.4 [Reserved]

   5.5 For a gas-fired or oil-fired unit that does not have a flow monitor and is using the procedures specified in appendix D to this part to monitor SO‹INF›2‹/INF› emissions or for any unit using a common stack for which the owner or operator chooses to determine heat input by fuel sampling and analysis, use the following procedures to calculate hourly heat input rate in mmBtu/hr. The procedures of section 5.5.3 of this appendix shall not be used to determine heat input from a coal unit that is required to comply with the provisions of this part for monitoring, recording, and reporting NO‹INF›X‹/INF› mass emissions under a State or federal NO‹INF›X‹/INF› mass emission reduction program.

   5.5.1(a) When the unit is combusting oil, use the following equation to calculate hourly heat input rate:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.056

   Where:

   HI‹INF›o‹/INF› = Hourly heat input rate from oil, mmBtu/hr. M‹INF›o‹/INF› = Mass rate of oil consumed per hour, as determined using procedures in appendix D to this part, in lb/hr, tons/hr, or kg/hr. GCV‹INF›o‹/INF› = Gross calorific value of oil, as measured by ASTM D240-87 (Reapproved 1991), ASTM D2015-91, or ASTM D2382-88 for each oil sample under section 2.2 of appendix D to this part, Btu/unit mass (incorporated by reference under Sec. 75.6). 10‹SUP›6‹/SUP› = Conversion of Btu to mmBtu.

   (b) When performing oil sampling and analysis solely for the purpose of the missing data procedures in Sec. 75.36, oil samples for measuring GCV may be taken weekly, and the procedures specified in appendix D to this part for determining the mass rate of oil consumed per hour are optional.

   5.5.2 When the unit is combusting gaseous fuels, use the following equation to calculate heat input rate from gaseous fuels for each hour:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.062

   Where:

   HIg = Hourly heat input rate from gaseous fuel, mmBtu/hour. Q‹INF›g‹/INF› = Metered flow rate of gaseous fuel combusted during unit operation, hundred cubic feet. GCV‹INF›g‹/INF› = Gross calorific value of gaseous fuel, as determined by sampling (for each delivery for gaseous fuel in lots, for each daily gas sample for gaseous fuel delivered by pipeline, for each hourly average for gas measured hourly with a gas chromatograph, or for each monthly sample of pipeline natural gas, or as verified by the contractual supplier at least once every month pipeline natural gas is combusted, as specified in section 2.3 of appendix D to this part) using ASTM D1826-88, ASTM D3588-91, ASTM D4891-89, GPA Standard 2172-86 ``Calculation of Gross Heating Value, Relative Density and Compressibility Factor for Natural Gas Mixtures from Compositional Analysis,'' or GPA Standard 2261-90 ``Analysis for Natural Gas and Similar Gaseous Mixtures by Gas Chromatography,'' Btu/100 scf (incorporated by reference under Sec. 75.6). 10‹SUP›6‹/SUP› = Conversion of Btu to mmBtu. * * * * *

   5.6 Heat Input Rate Apportionment for Units Sharing a Common Stack or Pipe

   5.6.1 Where applicable, the owner or operator of an affected unit that determines heat input rate at the unit level by apportioning the heat input monitored at a common stack or common pipe using megawatts should apportion the heat input rate using the following equation:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.057

   Where:

   HI‹INF›i‹/INF› = Heat input rate for a unit, mmBtu/hr. HI‹INF›cs‹/INF› = Heat input rate at the common stack or pipe, mmBtu/hr. MW‹INF›i‹/INF› = Gross electrical output, MWe. t‹INF›i‹/INF› = Operating time at a particular unit, hour or fraction of an hour (in equal increments that can range from one hundredth to one quarter of an hour, at the option of the owner or operator). t‹INF›CS‹/INF› = Operating time at common stack, hour or fraction of an hour (in equal increments that can range from one hundredth to one quarter of an hour, at the option of the owner or operator). n = Total number of units using the common stack. i = Designation of a particular unit.

   [[Page 28671]]

   5.6.2 Where applicable, the owner or operator of an affected unit that determines the heat input rate at the unit level by apportioning the heat input rate monitored at a common stack or common pipe using steam load should apportion the heat input rate using the following equation:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.058

   Where:

   HI‹INF›i‹/INF› = Heat input rate for a unit, mmBtu/hr. HI‹INF›CS‹/INF› = Heat input rate at the common stack or pipe, mmBtu/hr. SF = Gross steam load, lb/hr. t‹INF›i‹/INF› = Operating time at a particular unit, hour or fraction of an hour (in equal increments that can range from one hundredth to one quarter of an hour, at the option of the owner or operator). t‹INF›CS‹/INF› = Operating time at common stack, hour or fraction of an hour (in equal increments that can range from one hundredth to one quarter of an hour, at the option of the owner or operator). n = Total number of units using the common stack. i = Designation of a particular unit.

   5.7 Heat Input Rate Summation for Units with Multiple Stacks or Pipes

   The owner or operator of an affected unit that determines the heat input rate at the unit level by summing the heat input rates monitored at multiple stacks or multiple pipes should sum the heat input rates using the following equation:

   [GRAPHIC] [TIFF OMITTED] TR26MY99.059

   Where:

   HI‹INF›Unit‹/INF› = Heat input rate for a unit, mmBtu/hr. HI‹INF›s‹/INF› = Heat input rate for each stack or duct leading from the unit, mmBtu/hr. t‹INF›Unit‹/INF› = Operating time for the unit, hour or fraction of the hour (in equal increments that can range from one hundredth to one quarter of an hour, at the option of the owner or operator). t‹INF›s‹/INF› = Operating time during which the unit is exhausting through the stack or duct, hour or fraction of the hour (in equal increments that can range from one hundredth to one quarter of an hour, at the option of the owner or operator).

73. Appendix F is further amended by revising section 7 to read as follows:

7. Procedures for SO‹INF›2‹/INF› Mass Emissions at Units With SO‹INF›2‹/INF› Continuous Emission Monitoring Systems During the Combustion of Pipeline Natural Gas or Natural Gas

   The owner or operator shall use the following equation to calculate hourly SO‹INF›2‹/INF› mass emissions as allowed for units with SO‹INF›2‹/INF› continuous emission monitoring systems if, during the combustion of gaseous fuel that meets the definition of pipeline natural gas or natural gas in Sec. 72.2 of this chapter, SO‹INF›2‹/INF› emissions are determined in accordance with Sec. 75.11(e)(1).

   [GRAPHIC] [TIFF OMITTED] TR26MY99.060

   Where:

   E‹INF›h‹/INF› = Hourly SO‹INF›2‹/INF› mass emissions, lb/hr. ER = Applicable SO‹INF›2‹/INF› default emission rate from section 2.3.1.1 or 2.3.2.1.1 of appendix D to this part, lb/mmBtu. HI = Hourly heat input, as determined using the procedures of section 5.2 of this appendix.

74. Appendix F is further amended by correcting section 8 to read as follows:

8. Procedures for NO‹INF›X‹/INF› Mass Emissions

   The owner or operator of a unit that is required to monitor, record, and report NO‹INF›X‹/INF› mass emissions under a State or federal NO‹INF›X‹/INF› mass emission reduction program must use the procedures in section 8.1, 8.2, or 8.3, as applicable, to account for hourly NO‹INF›X‹/INF› mass emissions, and the procedures in section 8.4 to account for quarterly, seasonal, and annual NO‹INF›X‹/INF› mass emissions to the extent that the provisions of subpart H of this part are adopted as requirements under such a program.

75. Appendix G to part 75 is amended by revising the paragraph defining the term ``W‹INF›c‹/INF›'' that follows Equation G-1 and by revising the paragraph defining the term ``Fc'' that follows Equation G-4 to read as follows:

    Appendix G to Part 75--Determination of CO‹INF›2‹/INF› Emissions

    * * * * *

2. Procedures for Estimating CO‹INF›2‹/INF› Emissions From Combustion

   * * * * *

   2.1 * * *

   (Eq. G-1)

   Where: * * * * * W‹INF›c‹/INF› = Carbon burned, lb/day, determined using fuel sampling and analysis and fuel feed rates. Collect at least one fuel sample during each week that the unit combusts coal, one sample per each shipment or delivery for oil and diesel fuel, one fuel sample for each delivery for gaseous fuel in lots, one sample per day or per hour (as applicable) for each gaseous fuel that is required to be sampled daily or hourly for gross calorific value under section 2.3.5.6 of appendix D to this part, and one sample per month for each gaseous fuel that is required to be sampled monthly for gross calorific value under section 2.3.4.1 or 2.3.4.2 of appendix D to this part. Collect coal samples from a location in the fuel handling system that provides a sample representative of the fuel bunkered or consumed during the week. Determine the carbon content of each fuel sampling using one of the following methods: ASTM D3178-89 or ASTM D5373-93 for coal; ASTM D5291-92 ``Standard Test Methods for Instrumental Determination of Carbon, Hydrogen, and Nitrogen in Petroleum Products and Lubricants,'' ultimate analysis of oil, or computations based upon ASTM D3238-90 and either ASTM D2502-87 or ASTM D2503-82 (Reapproved 1987) for oil; and computations based on ASTM D1945-91 or ASTM D1946-90 for gas. Use daily fuel feed rates from company records for all fuels and the carbon content of the most recent fuel sample under this section to determine tons of carbon per day from combustion of each fuel. (All ASTM methods are incorporated by reference under Sec. 75.6.) Where more than one fuel is combusted during a calendar day, calculate total tons of carbon for the day from all fuels. * * * * *

   2.3 * * *

   (Eq. G-4)

   Where: * * * * * F‹INF›c‹/INF› = Carbon based F-factor, 1040 scf/mmBtu for natural gas; 1,240 scf/mmBtu for crude, residual, or distillate oil; and calculated according to the procedures in section 3.3.5 of appendix F to this part for other gaseous fuels. * * * * *

   [[Page 28672]]

76. Appendix G to part 75 is amended by adding new sections 5 through 5.3 to read as follows:

5. Missing Data Substitution Procedures for Fuel Analytical Data

   Use the following procedures to substitute for missing fuel analytical data used to calculate CO‹INF›2‹/INF› mass emissions under this appendix.

   5.1 Missing Carbon Content Data Prior to 4/1/2000

   Prior to April 1, 2000, follow either the procedures of this section or the procedures of section 5.2 of this appendix to substitute for missing carbon content data. On and after April 1, 2000, use the procedures of section 5.2 of this appendix to substitute for missing carbon content data, not the procedures of this section.

   5.1.1 Most Recent Previous Data

   Substitute the most recent, previous carbon content value available for that fuel type (gas, oil, or coal) of the same grade (for oil) or rank (for coal). To the extent practicable, use a carbon content value from the same fuel supply. Where no previous carbon content data are available for a particular fuel type or rank of coal, substitute the default carbon content from Table G-1 of this appendix.

   5.1.2 [Reserved]

   5.2 Missing Carbon Content Data On and After 4/1/2000

   Prior to April 1, 2000, follow either the procedures of this section or the procedures of section 5.1 of this appendix to substitute for missing carbon content data. On and after April 1, 2000, use the procedures of this section to substitute for missing carbon content data.

   5.2.1 In all cases (i.e., for weekly coal samples or composite oil samples from continuous sampling, for oil samples taken from the storage tank after transfer of a new delivery of fuel, for as- delivered samples of oil, diesel fuel, or gaseous fuel delivered in lots, and for gaseous fuel that is supplied by a pipeline and sampled monthly, daily or hourly for gross calorific value) when carbon content data is missing, report the appropriate default value from Table G-1.

   5.2.2 The missing data values in Table G-1 shall be reported whenever the results of a required sample of fuel carbon content are either missing or invalid. The substitute data value shall be used until the next valid carbon content sample is obtained.

   Table G-1.--Missing Data Substitution Procedures for Missing Carbon Content Data

   Sampling technique/ Parameter

   frequency

   Missing data value

   Oil and coal carbon content. All oil and coal Most recent, samples, prior to previous carbon April 1, 2000.

   content value available for that grade of oil, or default value, in this table. Gas carbon content.......... All gaseous fuel Most recent, samples, prior to previous carbon April 1, 2000.

   content value available for that type of gaseous fuel, or default value, in this table. Default coal carbon content. All, on and after Anthracite: 90.0 April 1, 2000.

   percent. Bituminous: 85.0 percent. Subbituminous/ Lignite: 75.0 percent. Default oil carbon content.. All, on and after 90.0 percent. April 1, 2000. Default gas carbon content.. All, on and after Natural gas: 75.0 April 1, 2000.

   percent. Other gaseous fuels: 90.0 percent.

   5.3 Gross Calorific Value Data

   For a gas-fired unit using the procedures of section 2.3 of this appendix to determine CO‹INF›2‹/INF› emissions, substitute for missing gross calorific value data used to calculate heat input by following the missing data procedures for gross calorific value in section 2.4 of appendix D to this part.

   Appendix H to Part 75--Revised Traceability Protocol No. 1

77. Appendix H to part 75 is removed and reserved.

    Appendix J to Part 75--Compliance Dates for Revised Recordkeeping Requirements and Missing Data Procedures

78. Appendix J to part 75 is removed and reserved.

    [FR Doc. 99-8939Filed5-25-99; 8:45 am]

    BILLING CODE 6560-50-U