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A. No air contaminant that is of such a shade or density as to obscure an observer’s vision to a degree in excess of 20 percent opacity shall be emitted into the atmosphere from any source.

B. Exceptions.

1. No air contaminant shall be emitted into the atmosphere from any pilot plant or experimental operation for a period or periods aggregating more than three minutes in any 60 consecutive minutes which is of such a shade or density as to obscure an observer’s vision to a degree in excess of 40 percent opacity. This emission standard for pilot plants and experimental operations shall be in effect for a period not to exceed 180 operating days, cumulative total, from the date such operations commence; thereafter, the 20 percent opacity limitations provided in subsection A of this section shall apply to emissions from pilot plants and experimental operations.

2. Emissions from fireplaces used for noncommercial or recreational purposes shall be exempt from subsection A of this section.

3. Subsection A of this section shall not apply to emissions during the buildup of a new fire, cleaning of fires, soot blowing, start-up, any process modification or adjustment or occasional cleaning of control equipment, the shade or appearance of which is not darker than an equivalent opacity so as to obscure an observer’s view to a degree not greater than 40 percent for a period or periods aggregating no more than three minutes in any one hour.

4. Subsection A of this section shall not apply to fugitive dust. (Ord. 2589 § 2 (part), 2011).