[Code of Federal Regulations]
[Title 40, Volume 13]
[Revised as of January 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR65.64]

[Page 56-60]
 
                TITLE 40 - PROTECTION OF ENVIRONMENT
 
      CHAPTER I - ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 65 - CONSOLIDATED FEDERAL AIR RULE--Table of Contents
 
                     Subpart D - Process Vents
 
Sec. 65.64  Group determination procedures.

    (a) General. The provisions of this section provide calculation and 
measurement methods for parameters that are used to determine group 
status.
    (b)(1) Sampling site. For purposes of determining TOC or HAP 
concentration, process vent volumetric flow rate, heating value, or TRE 
index value as specified under paragraph (c), (d), (e), (f), or (h) of 
this section, the sampling site shall be located after the last recovery 
device (if any recovery devices are present) but prior to the inlet of 
any control device that is present, and prior to release to the 
atmosphere.
    (2) Sampling site when a halogen reduction device is used prior to a 
combustion device. An owner or operator using a scrubber or other 
halogen reduction device to reduce the process vent halogen atom mass 
emission rate to less than 0.45 kilogram per hour (0.99 pound per hour) 
prior to a combustion control device in compliance with Sec. 
65.63(b)(2) shall determine the halogen atom mass emission rate prior to 
the combustor and after the scrubber or other halogen reduction device 
according to the procedures in paragraph (g) of this section.
    (3) Sampling site selection method. Method 1 or 1A of appendix A of 
40 CFR part 60, as appropriate, shall be used for selection of the 
sampling site. No traverse site selection method is needed for process 
vents smaller than 0.10 meter (4 inches) in nominal inside diameter.
    (c) TOC or HAP concentration. The TOC or HAP concentrations used for 
TRE index value calculations in paragraph (h) of this section shall be 
determined based on paragraph (c)(1) or (i) of this section, or any 
other method or data that have been validated according to the protocol 
in Method 301 of appendix A of 40 CFR part 63. For concentrations needed 
for comparison with the appropriate concentration in table 1 of this 
subpart, TOC or HAP concentration shall be determined based on paragraph 
(c)(1), (c)(2), or (i) of this section or any other method or data that 
have been validated according to the protocol in Method 301 of appendix 
A of 40 CFR part 63. The owner or operator shall record the TOC or HAP 
concentration as specified in Sec. 65.66(c).
    (1) Method 18. The procedures specified in paragraph (c)(1)(i) and 
(ii) of this section shall be used to calculate parts per million by 
volume concentration using Method 18 of appendix A of 40 CFR part 60.
    (i) The minimum sampling time for each run shall be 1 hour in which 
either an integrated sample or four grab samples shall be taken. If grab 
sampling is used, then the samples shall be taken at approximately equal 
intervals in time, such as 15-minute intervals during the run.
    (ii) The concentration of either TOC (minus methane and ethane) or 
organic HAP emissions shall be calculated using the following two 
procedures, as applicable.
    (A) The TOC concentration (CTOC) is the sum of the 
concentrations of the individual components and shall be computed for 
each run using Equation 64-1 of this section:

[[Page 57]]

[GRAPHIC] [TIFF OMITTED] TR14DE00.000

Where:

CTOC = Concentration of TOC (minus methane and ethane), dry 
basis, parts per million by volume.
x = Number of samples in the sample run.
n = Number of components in the sample.
Cji = Concentration of sample component j of the sample i, 
dry basis, parts per million by volume.

    (B) The total organic HAP concentration (CHAP) shall be 
computed according to the equation in paragraph (c)(1)(ii)(A) of this 
section except that only the organic HAP species shall be summed.
    (2) Method 25A. The following procedures shall be used to calculate 
parts per million by volume concentration using Method 25A of appendix A 
of 40 CFR part 60:
    (i) Method 25A of appendix A of 40 CFR part 60 shall be used only if 
a single organic compound of regulated material is greater than 50 
percent of total organic HAP or TOC, by volume, in the process vent.
    (ii) The process vent composition may be determined by either 
process knowledge, test data collected using an appropriate EPA method, 
or a method or data validated according to the protocol in Method 301 of 
appendix A of 40 CFR part 63. Examples of information that could 
constitute process knowledge include calculations based on material 
balances, process stoichiometry, or previous test results provided the 
results are still relevant to the current process vent conditions.
    (iii) The organic compound used as the calibration gas for Method 
25A of appendix A of 40 CFR part 60 shall be the single organic compound 
of regulated material present at greater than 50 percent of the total 
organic HAP or TOC by volume.
    (iv) The span value for Method 25A of appendix A of 40 CFR part 60 
shall be equal to the appropriate concentration value in table 1 to this 
subpart.
    (v) Use of Method 25A of appendix A of 40 CFR part 60 is acceptable 
if the response from the high-level calibration gas is at least 20 times 
the standard deviation of the response from the zero calibration gas 
when the instrument is zeroed on the most sensitive scale.
    (vi) The owner or operator shall demonstrate that the concentration 
of TOC including methane and ethane measured by Method 25A of appendix A 
of 40 CFR part 60 is below one-half the appropriate value in table 1 to 
this subpart to be considered a Group 2B vent with an organic HAP or TOC 
concentration below the appropriate value in table 1 to this subpart.
    (d) Volumetric flow rate. The process vent volumetric flow rate 
(QS) in standard cubic meters per minute at 20 
C (68 F) shall be determined as specified in 
paragraphs (d)(1) and (2) of this section and shall be recorded as 
specified in Sec. 65.66(b):
    (1) Use Method 2, 2A, 2C, or 2D of appendix A of 40 CFR part 60, as 
appropriate. If the process vent tested passes through a final steam jet 
ejector and is not condensed, the stream volumetric flow shall be 
corrected to 2.3 percent moisture; or
    (2) The engineering assessment procedures in paragraph (i) of this 
section can be used for determining volumetric flow rates.
    (e) Heating value. The net heating value shall be determined as 
specified in paragraphs (e)(1) and (2) of this section or by using the 
engineering assessment procedures in paragraph (i) of this section.
    (1) The net heating value of the process vent shall be calculated 
using Equation 64-2 of this section:
[GRAPHIC] [TIFF OMITTED] TR14DE00.001

Where:

HT = Net heating value of the sample, megajoule per standard 
cubic meter, where the net enthalpy per mole of process vent is based on 
combustion at 25 C and 760 millimeters of mercury, but the 
standard temperature for determining the volume corresponding to 1 mole 
is 20 C as in the definition of QS (process 
vent volumetric flow rate).
K1 = Constant, 1.740 x 10-7 (parts per 
million)-1 (gram-mole per standard cubic meter) (megajoule 
per kilocalorie), where standard temperature for (gram-mole per standard 
cubic meter) is 20 C.

[[Page 58]]

n = Number of components in the sample.
Dj = Concentration on a wet basis of compound j in parts per 
million as measured by procedures indicated in paragraph (e)(2) of this 
section. For process vents that pass through a final steam jet and are 
not condensed, the moisture is assumed to be 2.3 percent by volume.
Hj = Net heat of combustion of compound j, kilocalorie per 
gram-mole, based on combustion at 25 C and 760 millimeters 
of mercury. The heat of combustion of process vent components shall be 
determined using American Society for Testing and Materials (ASTM) 
D2382-76 (incorporated by reference as specified in Sec. 
65.13) if published values are not available or cannot be calculated.

    (2) The molar composition of the process vent (Dj) shall 
be determined using the following methods:
    (i) Method 18 of appendix A of 40 CFR part 60 to measure the 
concentration of each organic compound.
    (ii) American Society for Testing and Materials (ASTM) D1946-77 
(incorporated by reference as specified in Sec. 65.13) to 
measure the concentration of carbon monoxide and hydrogen.
    (iii) Method 4 of appendix A of 40 CFR part 60 to measure the 
moisture content of the stack gas.
    (f) TOC or HAP emission rate. The emission rate of TOC (minus 
methane and ethane) (ETOC) and/or the emission rate of total 
organic HAP (EHAP) in the process vent as required by the TRE 
index value equation specified in paragraph (h) of this section, shall 
be calculated using Equation 64.3 of this section:
[GRAPHIC] [TIFF OMITTED] TR14DE00.002

Where:

E = Emission rate of TOC (minus methane and ethane) (ETOC) or 
emission rate of total organic HAP (EHAP) in the sample, 
kilograms per hour.
K2 = Constant, 2.494 x 10-6 (parts per million) 
(gram-mole per standard cubic meter) (kilogram per gram) (minutes per 
hour), where standard temperature for (gram-mole per standard cubic 
meter) is 20 C.
n = Number of components in the sample.
Cj = Concentration on a dry basis of organic compound j in 
parts per million as measured by Method 18 of appendix A of 40 CFR part 
60 as indicated in paragraph (c) of this section. If the TOC emission 
rate is being calculated, Cj includes all organic compounds 
measured minus methane and ethane; if the total organic HAP emission 
rate is being calculated, only organic HAP compounds are included.
Mj = Molecular weight of organic compound j, gram/gram-mole.
Qs = Process vent flow rate, dry standard cubic meter per 
minute, at a temperature of 20 C.

    (g) Halogenated vent determination. In order to determine whether a 
process vent is halogenated, the mass emission rate of halogen atoms 
contained in organic compounds shall be calculated according to the 
procedures specified in paragraphs (g)(1) and (2) of this section. A 
process vent is considered halogenated if the mass emission rate of 
halogen atoms contained in the organic compounds is equal to or greater 
than 0.45 kilogram per hour (0.99 pound per hour).
    (1) The process vent concentration of each organic compound 
containing halogen atoms (parts per million by volume, by compound) 
shall be determined based on one of the following procedures:
    (i) Process knowledge that no halogen or hydrogen halides are 
present in the process vent; or
    (ii) Applicable engineering assessment as discussed in paragraph 
(i)(3) of this section; or
    (iii) Concentration of organic compounds containing halogens 
measured by Method 18 of appendix A of 40 CFR part 60; or
    (iv) Any other method or data that have been validated according to 
the applicable procedures in Method 301 of appendix A of 40 CFR part 63.
    (2) Equation 64-4 of this section shall be used to calculate the 
mass emission rate of halogen atoms:
[GRAPHIC] [TIFF OMITTED] TR14DE00.003

Where:

E = Mass of halogen atoms, dry basis, kilogram per hour.
K2 = Constant, 2.494 x 10- 6 (parts per 
million)-1 (kilogram-mole per standard cubic meter) (minute 
per hour), where standard temperature is 20 C.
Q = Flow rate of gas stream, dry standard cubic meters per minute, 
determined according to paragraph (d) or (i) of this section.

[[Page 59]]

n = Number of halogenated compounds j in the gas stream.
j = Halogenated compound j in the gas stream.
m = Number of different halogens i in each compound j of the gas stream.
i = Halogen atom i in compound j of the gas stream.
Cj = Concentration of halogenated compound j in the gas 
stream, dry basis, parts per million by volume.
Lji = Number of atoms of halogen i in compound j of the gas 
stream.
Mji = Molecular weight of halogen atom i in compound j of the 
gas stream, kilogram per kilogram-mole.

    (h) TRE index value. The owner or operator shall calculate the TRE 
index value of the process vent using the equations and procedures 
specified in paragraphs (h)(1) through (3) of this section, as 
applicable, and shall maintain the records specified in Sec. 
65.66(a) or Sec. 65.66(d)(4), as applicable.
    (1) TRE index value equation. Equation 64-5 of this section shall be 
used to calculate the TRE index:
[GRAPHIC] [TIFF OMITTED] TR14DE00.022

Where:

TRE = TRE index value.
A, B, C, D, E, and F = Parameters presented in tables 2 and 3 of this 
subpart that include the following variables:
Q = Process vent flow rate, standard cubic meters per minute, at a 
standard temperature of 20 C, as calculated according to 
paragraph (d) or (i) of this section.
H = Process vent net heating value, megajoules per standard cubic meter, 
as calculated according to paragraph (e) or (i) of this section.
ETOC = Emission rate of TOC (minus methane and ethane), 
kilograms per hour, as calculated according to paragraph (f) or (i) of 
this section.
EHAP = Emission rate of total organic HAP, kilograms per 
hour, as calculated according to paragraph (f) or (i) of this section.

    (2) Nonhalogenated process vents. The owner or operator of a 
nonhalogenated process vent shall calculate the TRE index value using 
either one of the following procedures, as applicable:
    (i) TRE calculations: Part 60 regulated sources. Use the parameters 
in table 2 to this subpart and calculate the TRE index value twice, once 
using the appropriate equation (depending on the heating value and flow 
rate of the process vent) in equations 15 through 30 and once using the 
appropriate equation (depending on the heating value of the process 
vent) in equations 31 and 32. Select the lowest TRE index value.
    (ii) TRE calculations: Part 63 regulated sources. Use the equation 
and parameters in table 3 to this subpart and calculate the TRE index 
value using equations 34, 35, and 36 for process vents at existing 
sources; or equations 38, 39, and 40 for process vents at new sources. 
Select the lowest TRE index value.
    (3) Halogenated process vents. The owner or operator of a 
halogenated process vent stream as determined according to procedures 
specified in paragraph (g) of this section shall calculate the TRE index 
value using either one of the following procedures, as applicable:
    (i) TRE Calculations: Part 60 regulated sources. Use the parameters 
in table 2 to this subpart and calculate the TRE index value using the 
appropriate equation chosen from equations 1 through 14 depending on the 
heating value and flow rate of the process vent.
    (ii) TRE calculations: Part 63 regulated sources. Use the 
appropriate parameters in table 3 to this subpart and calculate the TRE 
index value using equation 33 or 37 depending on whether the process 
vent is at a new or existing source.
    (i) Engineering assessment. For purposes of TRE index value 
determination, engineering assessment may be used to determine process 
vent flow rate, net heating value, TOC emission rate, and total organic 
HAP emission rate for the representative operating condition expected to 
yield the lowest TRE index value. Engineering assessments shall meet the 
requirements of paragraphs (i)(1) through (4) of this section. If 
process vent flow rate or process vent organic HAP or TOC concentration 
is being determined for comparison with the 0.011 scmm (0.40

[[Page 60]]

standard cubic foot) flow rate or the applicable concentration value in 
table 1 to this subpart, engineering assessment may be used to determine 
the flow rate or concentration for the representative operating 
condition expected to yield the highest flow rate or concentration.
    (1) If the TRE index value calculated using such engineering 
assessment and the TRE index value equation in paragraph (h) of this 
section is greater than 4.0, then the owner or operator is not required 
to perform the measurements specified in paragraphs (c) through (g) of 
this section.
    (2) If the TRE index value calculated using such engineering 
assessment and the TRE index value equation in paragraph (h) of this 
section is less than or equal to 4.0, then the owner or operator is 
required either to perform the measurements specified in paragraphs (c) 
through (g) of this section for group determination or to consider the 
process vent a Group 1 process vent and comply with the requirement (or 
standard) specified in Sec. 65.63(a) and, if applicable, 
Sec. 65.63(b).
    (3) Engineering assessment includes, but is not limited to, the 
examples specified in paragraphs (i)(3)(i) through (iv) of this section.
    (i) Previous test results provided the tests are representative of 
current operating practices at the process unit.
    (ii) Bench-scale or pilot-scale test data representative of the 
process under representative operating conditions.
    (iii) Maximum flow rate, TOC emission rate, organic HAP emission 
rate, organic HAP or TOC concentration, or net heating value limit 
specified or implied within a permit limit applicable to the process 
vent.
    (iv) Design analysis based on accepted chemical engineering 
principles, measurable process parameters, or physical or chemical laws 
or properties. Examples of analytical methods include, but are not 
limited to, the following examples:
    (A) Use of material balances based on process stoichiometry to 
estimate maximum TOC or organic HAP concentrations;
    (B) Estimation of maximum flow rate based on physical equipment 
design such as pump or blower capacities;
    (C) Estimation of TOC or organic HAP concentrations based on 
saturation conditions; and
    (D) Estimation of maximum expected net heating value based on the 
stream concentration of each organic compound or, alternatively, as if 
all TOC in the stream were the compound with the highest heating value.
    (4) All data, assumptions, and procedures used in the engineering 
assessment shall be documented. The owner or operator shall maintain the 
records specified in Sec. 65.66(a), (b), (c), or (d), as 
applicable.