N.J. Admin. Code § 7:27-9.4

Current through Register Vol. 56, No. 19, October 7, 2024

Section 7:27-9.4 - Waiver of air quality modelling

(a) The Department may waive the air quality simulation modelling requirements of N.J.A.C. 7:27-9.2(d) if the applicant demonstrates that:

1. The effective heights, as determined in accordance with the provisions of (b) below, of the stacks to be included in the mathematical combination are equal, or that the emissions from the fuel having the greatest sulfur content will be discharged to the atmosphere from the stack having the greatest effective height;

2. The total maximum SO[2] emission rate for all source gases to be included in the mathematical combination is no greater than 800 pounds per hour (363 Kg/hr);

3. No stack in the mathematical combination is separated from any other stack by a distance measured from the stack center lines, greater than three times the least effective stack height of any stack included in the mathematical combination; and

4. No stack in the mathematical combination is separated from any other stack by a distance greater than the allowable separation as determined from Figure 1 of this section.

(b) Procedure for using Figure 1.

1. Determine the effective stack heights in accordance with the provisions of (c) below.

2. Locate the least effective stack height on the left side of Figure 1 of this section.

3. Find the intersection of the least effective stack height and maximum total SO[2] emission rate. Interpolation is permitted.

4. Draw a vertical line from this point to the bottom of the chart to find the maximum allowable separation of the stacks.

(c) The effective stack height of a given stack for the purposes of this subchapter is the lesser of the following values:

1. 650 feet; or

2. The sum of the physical stack height and the plume rise. Plume rise is calculated from the formula:

Data in image

where:

h is the plume rise in feet;

u is 12 if the physical stack height is less than 65 feet; u is 5 for physical stack heights of 65 feet or greater;

V is the actual exit velocity of the stack gas in feet per second;

d is the inside diameter of the stack exit in feet; and

T is the temperature of the stack gas at the stack exit, in degrees Fahrenheit.

N.J. Admin. Code § 7:27-9.4

R.1982 d.456, effective 12/6/1982 (operative February 4, 1983).
See: 13 New Jersey Register 870(a), 14 New Jersey Register 1452(a).
Administrative correction to (a)3 and to (c)2.
See: 23 New Jersey Register 1166(b).