Ind. Admin. Code tit. 326, r. 6-3-2 – Particulate emission limitations, work practices, and control technologies

Authority: IC 13-14-8; IC 13-17-3-4; IC 13-17-3-11; IC 13-17-3-12

Sec. 2. (a) Any manufacturing process listed in subsections (b) through (d) shall follow the work practices and control technologies contained therein. All other manufacturing processes subject to this rule shall calculate emission limitations according to requirements in subsection (e).

(b) Cement manufacturing kilns commencing operation prior to December 6, 1968, shall not cause, allow, or permit any discharge to the atmosphere any gases containing particulate in excess of the following:

(1) E = 8.6 P0.67, equal to or below thirty (30) tons per hour of process weight.
(2) E = 15.0 P0.50, over thirty (30) tons per hour of process weight.
Where: E = Emission rate in pounds per hour.
P = Process weight rate in tons per hour.

(c) Catalytic cracking units commencing operation prior to December 6, 1968, and equipped with cyclone separators, electrostatic precipitators, or other gas-cleaning systems shall recover ninety-nine and ninety-seven hundredths percent (99.97%) or more of the circulating catalyst or total gas-borne particulate.

(d) Surface coating, reinforced plastics composites fabricating manufacturing processes, and graphic arts manufacturing processes shall be controlled by a dry particulate filter, waterwash, or an equivalent control device, subject to the following:

(1) The source shall operate the control device in accordance with manufacturer's specifications.
(2) If overspray is visibly detected at the exhaust or accumulates on the ground, the source shall inspect the control device and do either of the following no later than four (4) hours after such observation:
1. (A) Repair control device so that no overspray is visibly detectable at the exhaust or accumulates on the ground.
2. (B) Operate equipment so that no overspray is visibly detectable at the exhaust or accumulates on the ground.
If overspray is visibly detected, the source shall maintain a record of the action taken as a result of the inspection, any repairs of the control device, or change in operations, so that overspray is not visibly detected at the exhaust or accumulates on the ground. These records must be maintained for five (5) years.
(3) Sources that operate according to a valid permit pursuant to any of:
1. (A) 326 IAC 2-7;
2. (B) 326 IAC 2-8; or
3. (C) 326 IAC 2-9;
(4) Surface coating manufacturing processes that use less than five (5) gallons of coating per day are exempted as defined in section 1(b)(15) of this rule. At any time the coating application rate increases to greater than five (5) gallons per day, control devices must be in place. A manufacturing process that is subject to this subsection shall remain subject to it notwithstanding any subsequent decrease in gallons of coating used.

are exempt from subdivision (2).

(e) Manufacturing processes to which control methods in subsections (b) through (d) do not apply shall calculate allowable emissions as follows:

Allowable Rate of Emission Based on Process Weight Rate¹

Process Weight Rate			Process Weight Rate
Pounds Per Hour	Tons Per Hour	Rate of Emission Pounds Per Hour	Pounds Per Hour	Tons Per Hour	Rate of Emission Pounds Per Hour
100	0.05	0.551	16,000	8.00	16.5
200	0.10	0.877	18,000	9.00	17.9
400	0.20	1.39	20,000	10.00	19.2
600	0.30	1.83	30,000	15.00	25.2
800	0.40	2.22	40,000	20.00	30.5
1,000	0.50	2.58	50,000	25.00	35.4
1,500	0.75	3.38	60,000	30.00	40.0
2,000	1.00	4.10	70,000	35.00	41.3
2,500	1.25	4.76	80,000	40.00	42.5
3,000	1.50	5.38	90,000	45.00	43.6
3,500	1.75	5.97	100,000	50.00	44.6
4,000	2.00	6.52	120,000	60.00	46.3
5,000	2.50	7.58	140,000	70.00	47.8
6,000	3.00	8.56	160,000	80.00	49.1
7,000	3.50	9.49	200,000	100.00	51.3
8,000	4.00	10.4	1,000,000	500.00	69.0
9,000	4.50	11.2	2,000,000	1,000.00	77.6
10,000	5.00	12.0	6,000,000	3,000.00	92.7
12,000	6.00	13.6

(1) No person shall operate any manufacturing process so as to produce, cause, suffer, or allow particulate to be emitted in excess of the amount shown in the table in this subsection. The allowable rate of emission shall be based on the process weight rate for a manufacturing process.
(2) When the process weight rate is less than one hundred (100) pounds per hour, the allowable rate of emission is five hundred fifty- one thousandths (0.551) pound per hour.
(3) When the process weight rate exceeds two hundred (200) tons per hour, the allowable emission may exceed that shown in the following table, provided the concentration of particulate in the discharge gases to the atmosphere is less than one-tenth (0.10) pound per one thousand (1,000) pounds of gases:

*1Interpolation of the data in this table for process weight rates up to sixty thousand (60,000) pounds per hour shall be accomplished by use of the equation: E = 4.10 P^0.67 and interpolation and extrapolation of the data for process weight rates in excess of sixty thousand (60,000) pounds per hour shall be accomplished by use of the equation: E = 55.0 P^0.11 - 40

Where:	E	=	Rate of emission in pounds per hour.
	P	=	Process weight rate in tons per hour.

(Air Pollution Control Division; 326 IAC 6-3-2; filed Mar 10, 1988, 1:20 p.m.: 11 IR 2499; filed May 13, 2002, 11:30 a.m.: 25 IR 3052; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)