Or. Admin. Code § 340-220-0170 - Verified Emission Factors
(1) The
owner or operator must verify emission factors before using them to determine
emissions of regulated pollutants. To verify emission factors, the owner or
operator must perform either source testing using the DEQ Source Sampling
Manual or use other methods approved by DEQ for source tests. [NOTE: DEQ
manuals are published with OAR
340-200-0035.] Source tests must
be conducted using testing procedures on file at DEQ and DEQ approved pretest
plan which must be submitted at least 15 days before the testing. All test data
and results must be submitted for review to DEQ within 30 days after testing,
unless DEQ approves otherwise or a different time period is specified in a
permit.
NOTE: DEQ recommends that the owner or operator notify DEQ and obtain pre-approval of the emission factor source testing program before or as part of the first source test notification.
(2) The owner or operator must
conduct or have conducted at least three compliance source tests. Each test
must consist of at least three individual test runs for a total of at least
nine test runs.
(3) The owner or
operator must monitor and record applicable process and control device
operating data.
(4) The owner or
operator must perform a source test either:
(a) In each of three quarters of the year
with no two successive source tests performed any closer than 30 days apart;
or
(b) At equal intervals over the
operating period if the owner or operator demonstrates and DEQ agrees that the
device or activity operates or has operated for part of the year; or
(c) At any time during the year if the owner
or operator demonstrates, and DEQ agrees, that the process is or was not
subject to seasonal variations.
(5) The owner or operator must conduct the
source tests to test the entire range of operating levels. At least one test
must be conducted at minimum operating conditions, at normal or average
operating levels, and at anticipated maximum operating levels. If the process
rate is constant, all tests must be conducted at that rate. The owner or
operator must submit documentation to DEQ demonstrating a constant process
rate.
(6) The owner or operator
must determine an emission factor for each source test by dividing each test
run, in pounds of emission per hour, by the applicable process rate during the
source test run. At least nine emission factors must be plotted against the
respective process rates and a regression analysis performed to determine the
best fit equation and the correlation coefficient. If the correlation
coefficient is less than 0.50, which indicates that there is a relatively weak
relationship between emissions and process rates, the arithmetic average and
standard deviation of at least nine emission factors must be
determined.
(7) The owner or
operator must determine the Emissions Estimate Adjustment Factor (EEAF) as
follows:
(a) If the correlation coefficient
(R2) of the regression analysis is greater than 0.50, the EEAF will be
1+(1-R2).
(b) If the correlation
coefficient (R2) is less than 0.50, the EEAF will be: [Equation not included.
See NOTE.]
(8) The owner
or operator must determine actual emissions for emission fee purposes using one
of the following methods:
(a) If the
regression analysis correlation coefficient is less than 0.50, the actual
emissions is the average emission factor determined from at least nine test
runs multiplied by the EEAF multiplied by the total production for the entire
year; or [Equation not included. See NOTE.]
(b) If the regression analysis correlation
coefficient is greater than 0.50, perform the following calculations:
(A) Determine the average emission factor
(EF) for each production rate category (maximum = EFmax, normal = EFnorm, and
minimum = EFmin);
(B) Determine the
total annual production and operating hours, production time (PTtot), for the
calendar year;
(C) Determine the
total hours operating within the maximum production rate category (PTmax). The
maximum production rate category is any operation rate greater than the average
of at least three maximum operating rates during the source testing plus the
average of at least three normal operating rates during the source testing
divided by 2;
(D) Determine the
total hours while operating within the normal production rate category
(PTnorm). The normal production rate category is defined as any operating rate
less than the average of at least three maximum operating rates during the
source testing plus the average of at least three normal operating rates during
the source testing divided by 2 and any operating rate greater than the average
of at least three minimum operating rates during the source testing plus the
average of at least three normal operating rates during the source testing
divided by 2;
(E) Determine the
total hours while operating within the minimum production rate category
(PTmin). The minimum production rate category is defined as any operating rate
less than the average of at least three minimum operating rates during the
source testing plus the average of at least three normal operating rates during
the source testing divided by 2;
(F) Actual emissions equals EEAF x
((PTmax/PTtot) x EFmax + (PTnorm/PTtot) x EFnorm + (PTmin/PTtot) x
EFmin.)
(9)
The owner or operator must determine emissions during startup and shutdown, and
for emissions greater than normal, during conditions that are not accounted for
in the procedure otherwise used to document actual emissions. The owner or
operator must apply OAR
340-220-0170(9)(a)
or 340-220-0170(9)(b), (c) and
(d) in developing emission factors. The owner
or operator must apply the emission factor obtained to the total time the
device or activity operated under these conditions.
(a) All emissions during startup and
shutdown, and emissions greater than normal are assumed equivalent to operation
without an air pollution control device, unless the owner or operator
accurately demonstrates otherwise under OAR
340-220-0170(9)(b), (9)(c), (9)(d), and
(9)(e), and approved by DEQ. The emission
factor plus the EEAF must be adjusted by the air pollution control device
collection efficiency as follows: [Equation not included. See ED.
NOTE.]
(b) During process startups
a DEQ approved source test may be performed to determine an average startup
factor. The average of at least three tests runs plus the standard deviation
will be used to determine actual emissions during startups.
(c) During process shutdowns a DEQ approved
source test may be performed to determine an emission factor for shutdowns. The
average of at least three test runs plus the standard deviation will be used to
determine actual emissions during shutdowns.
(d) During routine maintenance activity the
owner or operator may:
(A) Perform routine
maintenance activity during source testing for verified emission factors;
or
(B) Determine emissions using
section (a).
(e) The
emission factor need not be adjusted if the owner or operator demonstrates to
DEQ that the regulated pollutant emissions do not increase during startup and
shutdown, and for conditions that are not accounted for in the procedure
otherwise used to document actual emissions (e.g. NOx emissions during an ESP
failure).
(10) A
verified emission factor developed pursuant to this division and approved by
DEQ cannot be used if a process change occurs that would affect the accuracy of
the verified emission factor.
(11)
The owner or operator may elect to use verified emission factors for source
categories if DEQ determines the following criteria are met:
(a) The verified emission factor for a source
category must be based on verified emission factors from at least three
individual sources within the source category;
(b) Verified emission factors from sources
within a source category must be developed using this rule;
(c) The verified emission factors from the
sources must not differ from the mean by more than twenty percent;
and
(d) The source category
verified emission factor must be the mean of the source verified emission
factors plus the average of the source emission estimate adjustment factors.
[NOTE: View a PDF of equations by clicking on the "Tables" link below.]
Notes
To view tables referenced in rule text, click here to view rule.
Statutory/Other Authority: ORS 468.020, 468.065, 468A.070, 468A.310 & 468A.315
Statutes/Other Implemented: ORS 468 & 468A
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