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Gas RATA Observation Sheet                                                                                 Appendix A

3.  RATA Observations (cont.)

RATA Checks

Observations

Record and independently calculate the bias/drift checks performed on the reference method sampling system before and after each run that you observe (Use Table in 4).  The response should be stable before it is recorded.  For bias/drift checks the sampling system bias must be within 5% of the span, and the calibration drift must be within 3% of span.

Check that the CEMS data periods and reference method data run times match.   Also check that run times meet the required minimum 21 minutes.

Observe post-test leak check.  Wet chemistry reference methods require a post-test leak check -- if failed the run is not valid.

Record or obtain a copy of the results if test calculations are performed on site.  You should also perform your own calculations on site directly from the test data to compare to the tester=s results. (See Tables 5 and 6).

Page A-16                                                                                                       Part 75 Field Audit Manual – July 16, 2003

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