NR 440.445(4)(d)(d) A furnace static pressure monitoring device is not required on any EAF equipped with a DEC system if observations of shop opacity are performed by a certified visible emission observer as follows: Shop opacity observations shall be conducted at least once per day when the furnace is operating in the meltdown and refining period. Shop opacity shall be determined as the arithmetic average of 24 or more consecutive 15-second opacity observations of emissions from the shop taken in accordance with Method 9. Shop opacity shall be recorded for any points where visible emissions are observed. Where it is possible to determine that a number of visible emission sites relate to only one incident of visible emissions, only one observation of shop opacity shall be required. In this case, the shop opacity observations shall be made for the site of highest opacity that directly relates to the cause or location of visible emissions observed during a single incident.

NR 440.445(4)(e)(e) A bag leak detection system shall be installed and continuously operated on all single-stack fabric filters if the owner or operator elects not to install and operate a continuous opacity monitoring system as provided for under par. (c). In addition, the owner or operator shall meet the visible emissions observation requirements in par. (c). The bag leak detection system shall meet the specifications and requirements of subds. 1. to 8.

NR 440.445(4)(e)1.1. The bag leak detection system shall be certified by the manufacturer to be capable of detecting particulate matter emissions at concentrations of one milligram per actual cubic meter (0.00044 grains per actual cubic foot) or less.

NR 440.445(4)(e)2.2. The bag leak detection system sensor shall provide output of relative particulate matter loadings and the owner or operator shall continuously record the output from the bag leak detection system using electronic or other mean such as a strip chart recorder or a data logger.

NR 440.445(4)(e)3.3. The bag leak detection system shall be equipped with an alarm system that will sound when an increase in relative particulate loading is detected over the alarm set point established according to subd. 4., and the alarm shall be located such that it can be heard by the appropriate plant personnel.

NR 440.445(4)(e)4.4. For each bag leak detection system required by this paragraph, the owner or operator shall develop and submit to the department, for approval, a site-specific monitoring plan that addresses the items identified in subd. 4. a. to e. For each bag leak detection system that operates based on the triboelectric effect, the monitoring plan shall be consistent with the recommendations contained in the EPA guidance document “Fabric Filter Bag Leak Detection Guidance” (EPA-454/R-98-015), incorporated by reference in s. NR 440.17 (2) (i) 4. The owner or operator shall operate and maintain the bag leak detection system according to the site-specific monitoring plan at all times. The plan shall describe all the following:

NR 440.445(4)(e)5.5. The initial adjustment of the system shall, at a minimum, consist of establishing the baseline output by adjusting the sensitivity (range) and the averaging period of the device, and establishing the alarm set points and the alarm delay time, if applicable.

NR 440.445(4)(e)6.6. Following initial adjustment, the owner or operator may not adjust the averaging period, alarm set point, or alarm delay time without approval from the department except as provided for in subd. 6. a. and b.

NR 440.445(4)(e)6.a.a. Once per quarter, the owner or operator may adjust the sensitivity of the bag leak detection system to account for seasonal effects including temperature and humidity according to the procedures identified in the site-specific monitoring plan required under subd. 4.

NR 440.445(4)(e)6.b.b. If opacities greater than zero percent are observed over 4 consecutive 15-second observations during the daily opacity observations required under par. (c) and the alarm on the bag leak detection system does not sound, the owner or operator shall lower the alarm set point on the bag leak detection system to a point where the alarm would have sounded during the period when the opacity observations were made.

NR 440.445(4)(e)7.7. For negative pressure, induced air baghouses, and positive pressure baghouses that are discharged to the atmosphere through a stack, the bag leak detection sensor shall be installed downstream of the baghouse and upstream of any wet scrubber.

NR 440.445(4)(f)(f) For each bag leak detection system installed according to par. (e), the owner or operator shall initiate procedures to determine the cause of all alarms within one hour of an alarm. Except as provided for under par. (g), the cause of the alarm shall be alleviated within 3 hours of the time the alarm occurred by taking whatever corrective actions are necessary. Corrective actions may include the following:

NR 440.445(4)(g)(g) In approving the site-specific monitoring plan required in par. (e) 4., the department may allow owners or operators more than 3 hours to alleviate specific conditions that cause an alarm if the owner or operator identifies the condition that could lead to an alarm in the monitoring plan, adequately explains why it is not feasible to alleviate the condition within 3 hours of the time the alarm occurred, and demonstrates that the requested additional time will ensure alleviation of the condition as expeditiously as practicable.