ArcelorMittal Dofasco and the Environment The Facts October 13, Excess Hot Metal Management ( Coffining ) What is coffining?

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1 ArcelorMittal Dofasco and the Environment The Facts October 13, 2017 Additional Information / Attachments: - ArcelorMittal Dofasco Site Specific Standards public information panels - Appendix: Process diagram reference - Available online for review: ArcelorMittal Dofasco Community Liaison Committee Presentations Excess Hot Metal Management ( Coffining ) What is coffining? Excess hot metal management is a necessity at every integrated steel mill in the world. There must be an outlet for hot metal if it is not consumable in the steelmaking process due to either unplanned or planned down time. The practice is minimized as much as possible to avoid both environmental and business impact. At ArcelorMittal Dofasco, excess hot metal is managed by pouring it into slag beds, sometimes referred to as coffins. The hot metal (liquid iron) is generated in the company s Blast Furnaces and is normally transferred to either the basic oxygen steelmaking furnace ( KOBM ) or electric arc furnace (EAF) as part of the steelmaking process. There are times when there is more hot metal produced than can be accepted by steelmaking (not all the time, but for example when a steelmaking furnace is not operational). In these cases, the metal is poured onto slag beds. A sudden release of water vapour may occur when the iron is poured quickly or there is excess moisture in the bed or slag. Visible emissions tend to happen more frequently after rain events, when the slag bed area is wet. The release is the eruption of the steam that is created during the pour. What has recently happened? A major crane failure at our basic oxygen furnace steelmaking on Sunday, October 8, 2017 resulted in an unplanned outage of the KOBM furnace. As a result, the excess hot metal management process was implemented quickly. Unfortunately, there had been very recent significant rains which made the beds extremely wet and difficult to manage, and the company experienced excess hot metal management emissions. How is ArcelorMittal Dofasco addressing coffining emissions? First and foremost, we do not want to see these kinds of emissions from our operations. Our teams do everything in their power to avoid them and we are committed to improving. In fact, since 2006 we have reduced coffining by roughly half. To that end, teams continue to analyze and review all available technical options to reduce or eliminate impacts of excess hot metal management, and information about the practice and options was presented to the company s Community Liaison Committee in April 1

2 2016. The review and file preparation for new technology continues and we hope to have a plan shortly for additional technology or processes to address this issue in the short term. To date we have implemented a running reline strategy to reduce the volume of excess hot metal generated during Basic Oxygen Furnace relines, which in turn reduces the need for excess hot metal management. We have also increased the amount of liquid iron used by the Electric Arc Furnace to aid in the consumption of hot metal. In addition, significant trials have been conducted, with best practices being embedded in Standard Operating Procedures (SOP) to manage the bed condition, moisture level, pouring rate and impact. We have also adopted a practice of storing 5,000 tons of steelmaking slag indoors so that it is dry and ready for use as a bed layer. Air Quality: Demonstrated Continuous Improvement ArcelorMittal Dofasco has worked, and continues to work, with the Ministry of Environment and Climate Change to adhere to the regulations of the Province for all aspects of our business. We fundamentally support all regulations which cover multiple parameters and are aligned to drive continuous improvement. As such, we are committed to continuously improving in all areas of our business and have work underway at all times to achieve this. For example, our $87 million coke restoration project consists of more than 100 projects. The work is extensive and is being done while the plants are operating. To complete them effectively and safely, without jeopardizing the sustainability of the assets, we must plan them over multiple years. In fact, the scope of our restoration has expanded with additional work. To accommodate for this, ArcelorMittal Dofasco has advised the Ministry of Environment and Climate Change that an additional year is required to complete the restoration until Dec 31, The regulations Reg 419/05 The company must comply with Ontario Regulation 419/05 for air quality as established by the MOECC. As part of this, ArcelorMittal Dofasco currently has MOECC-approved Site Specific Standards for five compounds (Benzo[a]Pyrene (B[a]P), Benzene, Total Reduced Sulphur (TRS), Total Suspended Particulate (TSP) and Manganese (Mn)). Site Specific or Technical Standards are not unique to ArcelorMittal Dofasco or the steel industry. In fact, all integrated Steelmakers in Ontario have Site Specific Standards in place, all mini mills in Ontario are working towards having a Technical Standard, and most other industrial sectors either have, or are working towards Technical Standards. There are many sectors and more than 52 companies that have requested and/or are registered to a Technical Standards in Ontario. Specifically with regard to cokemaking, these instruments are a necessary compliance mechanism in Ontario as cokemaking technology that would meet Reg 419/05 Standard for B[a]P does not exist. In other words, even a new coke facility would not meet Reg 419/05 Standard for B[a]P. The Standard set by the MOECC for Ontario for B[a]P is virtually at background level and reports indicate that the Standard is actually below concentrations currently found throughout Ontario. 2

3 How is ArcelorMittal Dofasco currently measuring against the regulations? ArcelorMittal Dofasco is currently meeting all Ontario Regulation 419/05 Point-of-Impingement (maximum fence line concentration) Standards and Site Specific Standards. The outstanding issue is related to at-source limits at Cokemaking. ArcelorMittal Dofasco s Site Specific Standard Order requires we achieve new lower 30-day rolling average limits in 2017 for coke oven door leaks and coke oven off-take leaks. We are currently meeting both limits at No.2 Coke Plant and the door-leak limit at No.3 Coke Plant, while working to meet the off-take limit at No.3. When performance at both plants is combined, all limits for total cokemaking are being met. To address the shortfall at No.3 Coke Plant for off-take limits, further off-take replacements have been scheduled over the balance of this year, such that we are hopeful of achieving and sustaining the 2017 limits. Those limits are in effect until For the four initial compounds included in the Site Specific Standards, targeted action plans resulted in improved performance. ~30% improvement / reduction) in TSP in point of impingement ~10% improvement (reduction)in TRS in point of impingement ~20% improvement/reduction in B[a]P in point of impingement >20% improvement /reduction in Benzene in point of impingement Improvement as a result of our Action Plan In the current Site Specific Standard period (2014 to 2020) action plans totaling $135 million will result in further improvement in performance. ~20% in TSP in point of impingement ~60% in TRS meeting Reg 419/05 standard ~30% in B[a]P in point of impingement ~10% in benzene in point of impingement ~3% in Mn in point of impingement 3

4 Air quality trends for the City of Hamilton for ArcelorMittal Dofasco s Site Specific Standard compounds (from Clean Air Hamilton 2016 Air Quality Progress Report): A responsible business committed to Hamilton ArcelorMittal Dofasco is committed to continuous improvement in every aspect of its operations. Our company has, and will continue to, demonstrate our commitment to: A focus on continuous improvement in all aspects of the business; Ensuring we both plan and react appropriately and responsibly where there may be environmental or community impact from operations; Continue to be a positive contributor to the region and a responsible member of the Hamilton community. 4

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