Boat Manufacturing MACT
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7. How Does an Affected Facility Demonstrate Compliance if They
are Using an Enclosure and an Add-On Control Device?
If
a source uses an enclosure (such as a spray booth) and an
add-on control,
US EPA Method 204 must be used to prove that the enclosure is a total enclosure.
If the enclosure is not a total enclosure, a temporary enclosure can be used
to measure the fugitive emissions from the enclosure and the control device.
Stack testing is used to determine compliance with the emissions limit. To measure
emissions US
EPA Method 25A as total hydrocarbons (as a surrogate for total HAP) or US
EPA Method 18 for specific HAP must be used. New and existing sources that
comply using add-on control devices must conduct the required performance testing
no later than 180 days after their compliance date.
 During and after the initial performance test, the facility
must monitor and record certain control device parameters
to ensure that the control device continues to be operated
as it was during the test. For example, for thermal oxidizers
the source must monitor and record combustion temperature
and maintain the temperature above an allowable minimum
value. For control devices other than thermal oxidizers,
the facility must identify parameters that demonstrate
proper control device operation and have these parameters
approved by the appropriate local air pollution control
agency. Monitored operating parameters must be kept within
the allowable ranges to demonstrate compliance with the
control device operating requirement.
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