Seal means, for acrylic and modacrylic fiber production affected sources complying with the requirements of 63.1033 or 63.167(a) on or after October 8, 2014, that instrument monitoring of the open-ended valve or line conducted according to the method specified in 63.1023(b) and, as applicable, 63.1023(c), or 63.180(b) and, as applicable, 63.180(c), indicates no readings of 500 parts per million or greater.


40 CFR § 63.1103

Scoping language

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