No detectable emissions

No detectable emissions means less than 500 parts per million by volume above background levels, as measured by a detection instrument reading in accordance with the procedures specified in 61.355(h) of this subpart.

Source

40 CFR § 61.341

Scoping language

Benzene concentration means the fraction by weight of benzene in a waste as determined in accordance with the procedures specified in 61.355 of this subpart.