The following are applicable to source tests for determining alternative opacity limitations under § 123.45 (relating to alternative opacity limitations).

1. (1) A series of three consecutive performance tests shall be conducted in accordance with the requirements of § § 139.1—139.4, 139.11 and 139.12. The time period from the beginning of the first test to the end of the third test may not exceed 8 hours.
2. (2) The opacity of emissions, as determined in accordance with the measurement technique specified in § 123.45 (relating to alternative opacity limitations), shall be recorded for the entire time period from the beginning of the first performance test to the end of the third performance test.
3. (3) If continuous opacity monitoring equipment is required, it shall be installed, operated and maintained in accordance with Subchapter C (relating to requirements for source monitoring for stationary sources).
4. (4) If continuous opacity monitoring equipment is not required, visual observation of opacity shall be conducted by the source owner or operator in accordance with the procedures in Appendix A, Method 9 of § 139.102(1) (relating to references).

5. (5) Prior to the first performance test, the results of opacity measurements obtained in accordance with the technique specified in § 123.45 will be compared to the results of visual observations conducted by the Department in accordance with Appendix A, Method 9 of § 139.102(1).

   1. (i) A series of 60 consecutive observations will be conducted by the Department observer at intervals of 15 seconds. The results will be reduced to fifteen 1-minute averages.
   2. (ii) The opacity measurements obtained by the techniques specified in § 123.45 for the same time period will be reduced to fifteen 1-minute averages corresponding to those calculated in subparagraph (i).
   3. (iii) If any of the 1-minute averages as calculated in subparagraph (ii) differ by more than 15% opacity from the corresponding 1-minute average as calculated in subparagraph (i), the cause shall be determined and the comparison repeated after appropriate adjustments have been made but before commencement of the first performance test.
   4. (iv) If the average of the absolute values of the differences between the 1-minute averages as calculated in subparagraph (ii) and the corresponding 1-minute averages as calculated in subparagraph (i) is greater than 7.5% opacity, the cause shall be determined and the comparison repeated after appropriate adjustments have been made but before commencement of the first performance test.

Source

The provisions of this § 139.17 adopted June 19, 1981, effective June 20, 1981, 11 Pa.B. 2132.

Cross References

This section cited in 25 Pa. Code § 123.45 (relating to alternative opacity limitations); and 25 Pa. Code § 139.12 (relating to emissions of particulate matter).