A. Existing Installations: Single sources of emissions from existing installations, except incinerators and internal combustion engines, shall be of a shade or density no darker than a number 2 Ringelmann chart (40 percent black) or an equivalent opacity, except as provided in subsection F of this section, or its successor subsection.
B. Incinerators And New Installations: Single sources of emission from any incinerator or any other new installation, except internal combustion engines, shall be of a shade or density no darker than a number 1/2 Ringelmann (10 percent black) or an equivalent opacity, except as provided in subsection F of this section, or its successor subsection.
C. Gasoline Engines: Gasoline engine emissions shall not be visible, except for a starting motion, no farther than one hundred (100) yards, or for stationary operation not exceeding three (3) minutes in any hour.
D. Diesel Engines 1973 And Later: Emissions from diesel engines manufactured after January 1, 1973, shall be of a shade or density no darker than a number 1/2 Ringelmann (10 percent black) or an equivalent opacity, except for starting motion, no farther than one hundred (100) yards or for stationary operation not exceeding three (3) minutes in any hour.
E. Diesel Engines Pre-1973: Emissions from diesel engines manufactured before January 1, 1973, shall be of a shade or density no darker than a number 2 Ringelmann (40 percent black) or equivalent opacity, except for starting motion, no farther than one hundred (100) yards or for stationary operation not exceeding three (3) minutes in any hour.
F. Exceptions:
1. When conducting a procedure or using equipment necessary to the operation of a process such as, but not limited to, building a new fire, tube blowing, initial warmup or startup of locomotives, or cleaning grates, the limits specified in these regulations may be exceeded when it can be demonstrated to be unavoidable.
2. An emission failing to meet the standard because of the effect of uncombined water shall not be in violation. (Prior code § 3-1-13)