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Which statement about the good engineering practice height is TRUE?

  • A.It guarantees compliance with air quality standards
  • B.It is calculated from the emission rate
  • C.It places the release above the wake cavity
  • D.It is the maximum height a stack may be built

Answer: C

Correct answer: It places the release above the wake cavity

The GEP height is the height at which the release clears the recirculating wake generated by nearby buildings. It guarantees nothing about ambient standards, it is calculated from building dimensions rather than emissions, and it is not a maximum permitted height - it is a ceiling on the dispersion credit that may be claimed, which is a different thing.

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