New Jersey Administrative Code
Title 7 - ENVIRONMENTAL PROTECTION
Chapter 27B - SAMPLING AND ANALYTICAL PROCEDURES
Subchapter 2 - PROCEDURES FOR THE VISUAL DETERMINATION OF THE OPACITY (PER CENT) AND THE SHADE OR APPEARANCE (RINGELMANN NUMBER) OF EMISSIONS FROM SOURCES
Section 7:27B-2.4 - General observation requirements

Universal Citation: NJ Admin Code 7:27B-2.4

Current through Register Vol. 56, No. 24, December 18, 2024

(a) The observer shall stand at a distance sufficient to provide a clear view of the emissions.

(b) The observer shall be located so that:

1. For per cent opacity readings, the sun shall be oriented in the 140 degree sector to the observer's back.

2. For Ringelmann number readings, the sun should be oriented in the 140 degree sector to the observer's back; however, where conditions do not permit, the sun need not be to the observer's back.

(c) Observations shall be directed to the point of the greatest per cent opacity or greatest Ringelmann number in the plume.

(d) Consistent with the requirements of subsections (a) and (b) of this Section, the observer shall make observations using a line of vision as close to 90 degrees as possible to the direction of the plume at the point specified in subsection (c) of this Section.

(e) The observer shall not look continuously at the plume, but shall observe the plume momentarily at 15-second intervals, except where consecutive second standards are prescribed (that is, N.J.A.C. 7:27-3.4 and 3.5).

(f) Rules for plumes which contain visible water ("steam" plumes) are:

1. Where visible water is present within the plume at the point of discharge of the outdoor atmosphere ("attached" plume), observations shall be made beyond the transition point after which water is no longer visible in the plume.

2. Where water vapor in the plume condenses and becomes visible at a distance after the point of discharge to the outdoor atmosphere ("detached" plume), observations should be made before the transition point where water vapor becomes visible in the plume.

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