(a) Visible emissions must not exceed 150 seconds from any five consecutive charges at a single battery when measured in accordance with the procedures set forth in subdivisions (b), (c), (d) and (e) of this section.

(b) For the purpose of determining compliance with subdivision (a) of this section, visible emissions are those emissions of any degree of opacity greater than zero discharged during the charging of coal to the coke oven, including emissions from the offtake piping, larry car hoppers, drop sleeves, jumper pipes, charging holes or any of the oven equipment and tools associated with this operation.

(c) In conveyor-type coal charging systems, the observer will read visible emissions only from the charging holes, offtake piping, charging buggy, drop sleeves, the interface between the charging buggy and the conveyor, the conveyor system and any other equipment associated with the charging operation subsequent to the coal feed to the conveyor. This procedure will be followed whether the conveyor system is charging the battery with wet or dry coal.

(d) Compliance will be determined by observing and timing with a cumulative stopwatch the visible emissions from each oven charged during a series of consecutive charges of a single battery. The observer will be positioned on the battery top, at a distance of five to ten ovens from the oven being charged. In the event that such a position results in an obstructed view, the observer must assume another position to allow a clear view of the emissions. The cumulative time of visible emissions during the charging of each oven must be recorded. Visible emissions discharged simultaneously from more than one point on the same oven will be timed as a single emission.

(e) Compliance with the emission limit will be determined by summing the cumulative times for any single series of five consecutive charges and comparing this total with the appropriate standard. An obscured charge or other interruptions to the observations being made of a series of charges will not disrupt an otherwise consecutive series in calculating compliance with the emission limit. The longest cumulative time of any visible emission for a single charge in a group of any 20 charges at any battery will be disregarded, but will not disrupt any otherwise consecutive series in calculating compliance with the emission limit.