Section 58.01.01.625 - VISIBLE EMISSIONSA person must not discharge any air pollutant into the atmosphere from any point of emission for a period or periods aggregating more than three (3) minutes in any sixty (60) minute period which is greater than twenty percent (20%) opacity as determined by this section.
01.Exemptions. The provisions of this section will not apply to:a. Kraft Process Lime Kilns, if operating prior to January 24, 1969; orb. Carbon Monoxide Flare Pits on Elemental Phosphorous Furnaces, if operating prior to January 24, 1969; orc. Liquid Phosphorous Loading Operations, if operating prior to January 24, 1969; ord. Kraft Process Recovery Furnaces; ore. Calcining Operations Utilizing an Electrostatic Precipitator to Control Emissions, if operating prior to January 24, 1969.02.Standards for Exempted Sources. For sources exempted from the provisions of this section, a person must not discharge into the atmosphere from any point of emission, for any air pollutant for a period or periods aggregating more than three (3) minutes in any sixty (60) minute period which is greater than forty percent (40%) opacity as determined by this section.03.Exception. The provisions of this section do not apply when the presence of uncombined water, nitrogen oxides and/or chlorine gas are the only reason(s) for the failure of the emission to comply with the requirements of this rule.04.Test Methods and Procedures. The appropriate test method under this section is EPA Method 9 (contained in 40 CFR Part 60) with the method of calculating opacity exceedances altered as follows:a. Opacity evaluations must be conducted using forms available from the Department or similar forms approved by the Department.b. Opacity must be determined by counting the number of readings in excess of the percent opacity limitation, dividing this number by four (4) (each reading is deemed to represent fifteen (15) seconds) to find the number of minutes in excess of the percent opacity limitation. This method is described in the Procedures Manual for Air Pollution Control, Section II (Evaluation of Visible Emissions Manual), September 1986.c. Sources subject to New Source Performance Standards must calculate opacity as detailed above and as specified in 40 CFR Part 60.05.Applicability. Section 625 does not apply to the open burning of crop residue.Idaho Admin. Code r. 58.01.01.625