GBUAPCD RULE 400 RINGELMANN CHART
LAST REVISED 11/11/11

REGULATION IV - PROHIBITIONS


RULE 400. Ringelmann Chart

A person shall not discharge into the atmosphere from any single source of emission whatsoever, any air contaminant for a period or periods aggregating more than three minutes in any one hour which is:

A. As dark or darker in shade as that designated as No. 1 on the Ringelmann Chart, as published by the United States Bureau of Mines; or

B. Of such opacity as to obscure an observer's view to a degree equal to or greater than does smoke described in subsection (A) of this rule.

1. "An observer" is defined as either a human observer or a certified, calibrated, in-stack opacity monitoring system.