***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** E.O. 12866 Ferroalloys 2060 - AQ11 Propos al 20111006 6560 - 50 - P

ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 63 [ EPA - HQ - OAR - 2010 - 0895 ; FRL - ]

RIN 2060 - AQ - 11 National Emissions Standards for Hazardous Air Pollutants: Ferroalloys Production
AGENCY: Environmental Protection Agency (EPA).
ACTION : Proposed rule. SUMMARY: The EPA is proposing amendments to the national emissions standards for hazardous air pollutants for F erroalloys P roduction to address the results of the residual risk and technology review that the EPA is required to conduct under the Clean Air Act. These proposed amendments include revisions to particulate matter standards for electric arc furnaces, metal oxygen refining process es , and crushing and screening operations. T he amendments add emission l imits for hydrochloric acid, hydrofluoric acid, mercury, p olycyclic

a romatic h ydrocarbons , and formald e hyde fr om electric arc furnaces. The amendments also expand and revise the requirements to control fugitive emissions from furnace operations and casting . Other requirements related to testing , monitoring , no tification, recordkeeping, and reporting are included . We are also proposing to revise provisions addressing periods of startup, shutdown, and***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 2 of 225 malfunction to ensure that the rules are consistent with a recent court decision. DATES: Comments must be received on or before [ INSERT THE DATE 45
DAYS AFTER THE DATE OF PUBLICATION OF THIS PROPOSED RULE IN THE
FEDERAL REGISTER ]. Under the Paperwork Reduction Act, comments on the information collection provisi ons are best assured of having full effect if the Office of Management and Budget (OMB) receives a copy of your comments on or before [ INSERT THE DATE 30 DAYS AFTER THE DATE
OF PUBLICATION OF THIS PROPOSED RULE IN THE FEDERAL REGISTER ]. Public Hearing . If anyone contacts EPA requesting to speak at a public hearing by [ INSERT THE DATE 10 DAYS AFTER THE DATE OF
PUBLICATION IN THE FEDERAL REGISTER ] , a public hearing will be held

on [ INSERT THE DATE 15 DAYS AFTER THE DATE OF PUBLICATION IN THE
FEDERAL REGISTER ]
. ADDRESSES: Submit your comments, identified by Docket ID Number EPA

HQ

- OAR

- 2010

- 0895 , by one of the following methods: http:// www.regulations.gov : Follow the on

- line instructions for submitting comments. Email : a - and

- r - docket@epa.gov , Attention Docket I D Number EPA

HQ

- OAR

- 2010

- 0895
. Fax: (202) 566

- 9744, Attention Docket ID Number EPA

- HQ

- OAR

- 2010

- 0895
. Mail : U.S. Postal Service, send comments to: EPA Docket Center, EPA West (Air Docket), Attention Docket ID Number EPA

- HQ

- OAR

2010

- 0895 , U.S. Environmental Protection Agency, Mailcode: 2822T, 1200 Pennsylvania Ave., NW, Washington, DC 20460. Please include a total of two copies. In addition, please mail a copy of your comments on the information collection provisions to the Office of Information and Regulator y Affairs, Office of***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 3 of 225 Management and Budget (OMB), Attn: Desk Officer for EPA, 725 17 th Street, NW, Washington, DC 20503. Hand Delivery : U.S. Environmental Protection Agency, EPA West (Air Docket), Room 3334, 1301 Constitution Ave., NW, Washington, DC 2000 4, Attention Docket ID Number EPA

- HQ

- OAR

- 201 0

- 0895
. Such deliveries are only accepted during the Docket‘s normal hours of operation, and special arrangements should be made for deliveries of boxed information.

Instructions
. Direct your comments to Docket ID Number EPA

- HQ

OAR

- 2010

- 0895
. EPA‘s policy is that all comments received will be included in the public docket without change and may be made available on

- line at http:// www.regulations.gov , including any personal information provided, unless the comment includes information claimed to be confidential business information (CBI) or other information whose disclosure is restricted by statute. Do not submit information that you consider to be CBI or otherwise protected through http:// www.regulations.gov or e mail. The http:// www.regulations.gov website is an ―anonymous access‖ system, which means EPA will not know your identity or contact information unless you provide it in the body of your comment. If you send an email comment directly to EPA without going t hrough http:// www.regulations.gov , your email address will be automatically captured and included as part of the comment that is placed in the public docket and made available on the Internet. If you submit an electronic comment, EPA recommends that you in clude your name and other contact information in the body of your comment and with any disk or CD

- ROM you submit. If EPA cannot read your comment due to***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 4 of 225 technical difficulties and cannot contact you for clarification, EPA may not be able to consider your c omment. Electronic files should avoid the use of special characters, any form of encryption, and be free of any defects or viruses. For additional information about EPA‘s public docket, visit the EPA Docket Center homepage at

e pa.gov/epahome/dockets.htm

. D ocket
. The EPA has established a docket for this rulemaking under Docket ID Number EPA

- HQ

- OAR

- 2010

- 0895
. All documents in the docket are listed in the regulations.gov index. Although listed in the index, some information is not publicly available, e.g. , CB I or other information whose disclosure is restricted by statute. Certain other material, such as copyrighted material, is not placed on the Internet and will be publicly available only in hard copy. Publicly available docket materials are available either electronically in regulations.gov or in hard copy at the EPA Docket Center, EPA West, Room 3334, 1301 Constitution Ave., NW, Washington, DC. The Public Reading Room is open from 8:30 a.m. to 4:30 p.m., Monday through Friday, excluding legal holidays. The telephone number for the Public Reading Room is (202) 566

- 1744, and the telephone number for the EPA Docket Center is (202) 566

- 1742. Public Hearing . If a public hearing is held, it will begin at 10:00 a.m. on [ INSERT THE DATE 15 DAYS AFTER THE DATE OF PUB LICATION
OF THIS PROPOSED RULE IN THE FEDERAL REGISTER ] and will be held at EPA‘s campus in Research Triangle Park, North Carolina, or at an***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 5 of 225 alternate facility nearby. Persons interested in presenting oral testimony or inquiring as to whether a public hear ing is to be held should contact Ms. Virginia Hunt, Office of Air Quality Planning and Standards (OAQPS) , Sector Policies and Programs Division, (D243

- 02), U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711; telephone number : (919) 541

– 0832. FOR FURTHER INFORMATION CONTACT : For questions about this proposed action, c ontact Mr . Conrad Chin , Sector Policies and Programs Division (D243

- 02), Office of Air Quality Planning and Standards, U.S. Environmental Protection Agency, Rese arch Triangle Park, North Carolina 27711, telephone (919) 541

- 1512 ; fax number: (919) 541

- 320 7 ; and email address: chin.conrad @epa. gov . For specific information regarding the risk modeling methodology, contact Ms. Darcie Smith , Health and Environmental Imp acts Division (C539

- 02), Office of Air Quality Planning and Standards, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711; telephone number: (919) 541

– 2076 ; fax number: (919) 541

– 0840; and email address: smith.darcie@epa.gov . For information about the applicability of the National Emissions Standards for Hazardous Air Pollutants ( NESHAP ) to a particular entity, contact the appropriate person listed in Table 1 of this preamble.
Table 1
. List o f E PA Contacts For The N ESHAP Addr essed In This Proposed Action NESHAP for: OECA Contact 1 OAQPS Contact 2 Ferroalloys Production Cary Secrest , (202)

564

- 8661 Conrad Chin , (919) 541

- 1512 ,***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 6 of 225 secrest.cary @epa.gov chin.conrad @epa. gov 1 EPA Office of Enforcement and Compliance Assurance. 2 EP A Office of Air Quality Planning and Standards. SUPPLEMENTARY INFORMATION : Preamble Acronyms and Abbreviations Several acronyms and terms used to describe industrial processes, data inventories, and risk modeling are included in this preamble. While this may not be an exhaustive list, to ease the reading of this preamble and for reference purposes, the following terms and acronyms are defined here:

ACI Activated Carbon Injection ADAF age - dependent adjustment factors AEGL acute exposure guideline levels AE RMOD air dispersion model used by the HEM

- 3 model ATSDR Agency for Toxic Substan ces and Disease Registry BLDS bag leak detection system BPT benefit

- per - ton CAA Clean Air Act CalEPA California EPA CBI Confidential Business Information CFR Code of Federal Re gulations CIIT Chemical Industry Institute of Toxicology CO 2 carbon dioxide EJ environmental justice EPA Environmental Protection Agency ERPG Emergency Response Planning Guidelines ERT Electronic Reporting Tool FR Federal Register gr/dscf grains per dry s tandard cubic foot HAP hazardous air pollutants HCl hydrochloric acid HEM

- 3 Human Exposure Model, Version 1.1.0 HF hydrofluoric acid HI Hazard Index***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 7 of 225
HON hazardous organic national emissions standard s for

hazardous air pollutants HQ Hazard Quotient ICR i nfo rmation collection request IRIS Integrated Risk Information System kg/hr kilograms per hour kg/hr/MW kilograms per hour per megawatt k m kilometer lb/hr pounds per hour lb/hr/MW pounds per hour per megawatt lb/yr p ounds per year LML lowest measured level MA CT maximum achievable control technology MACT Code Code within the National Emissions Inventory used to

identify processes included in a source category MDL method detection limit mg/dscm milligrams per dry standard cubic meter MIR maximum individual risk MM millions MW megawatt NAC/AEGL Committee National Advisory Committee for Acute Exposure Guideline

Levels for Hazardous Substances NAICS North American Industry Classification System NAS National Academy of Sciences NATA National Air Toxics Assessment N ESHAP National Emissions Standard s for Hazardous Air P ollutants NRC National Research Council NTTAA National Technology Transfer and Advancement Act OAQPS Office of Air Quality Planning and Standards OECA Office of Enforcement and Compliance Assurance OMB Office of Management and Budget PAH polycyclic aromatic hydrocarbons PB

- HAP h azardous air pollutants known to be persistent and bio

accumulative in the environment PM particulate matter POM polycyclic organic matter QA quality assurance RCRA Resource Cons ervation and Recovery Act***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 8 of 225
RDL representative detection level REL reference exposure level RFA Regulatory Flexibility Act RfC reference concentration RfD reference dose RIA Regulatory Impact Analysis RTR residual risk and technology review SAB Science Advi sory Board SBA Small Business Administration SOP standard operating procedures SSM startup, shutdown , and malfunction TOSHI target organ

- specific hazard index TPY tons per year TRIM .FaTE Total Risk Integrated Methodology.Fate, Transport, and

Ecological Exp osure model TTN Technology Transfer Network UF uncertainty factor μg/m 3 microgram per cubic meter UMRA Unfunded Mandates Reform Act UPL upper predictive limit URE unit risk estimate VCS voluntary consensus standards WWW world wide web Organization of this Document . The information in this preamble is organized as follows:

I. General Information A . Summary of Costs and Ben efits B. What are NESHAP? C. Does this action apply to me? D . Where can I get a copy of this document and other related information? E . What should I cons ider as I prepare my comments for EPA? II. Background A. What is this source category and how did the 1999 MACT standards regulate its HAP emissions? B. W hat data collection activities were conducted to support this action?***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 9 of 225 C. What other relevant background information from previous studies on ferroalloys emissions is available? III. Analyses Performed A. How did we address unregulated emissions sources? B. How did we estimate risks posed by the source category? C. How did we consider the risk results in making decisions for this proposal? D. How did we perform the technology review? E. What other issues are we addressing in this proposal? IV. Analytical Results and Proposed Decisions A. What are the results of our analyses and proposed decisions regarding unregulated pollutants? B . What are the results of the risk assessment and analyses? C . What are our proposed decisions based on risk acceptability and ample margin of safety? D What are the results and proposed decisions based on our technology review? E. Wh at other actions are we proposing? F. What c ompliance d ates are we proposing? V. Summary of Cost, Environmental, and Economic Impacts A. What are the affe cted sources? B. What are the air quality impacts? C. What are the cost impacts? D. What are the economic impacts? E. Wh at are the benefits? F. What demographic groups might benefit from this regulation VI. Request for Comments VII. Submitting Data Corrections VIII. Statuto ry and Executive Order Reviews A. Executive Order 12866: Regulatory Planning and Review and Executive Order 13563: Improving Regulation and Regulatory Review B. Paperwork Reduction Act C. Regulatory Flexibility Act D. Unfunded Mandates Reform Act E. Executive Order 13132: Federalism F. Executive Order 13175 : Consultation and Coordination with Indian Tribal Governments G. Executive Order 13045: Protection of Children from Environmental Health Risks and Safety Risks H. Executive Order 13211: A ctions Concerning Regulations That Significantly Affect Energy Supply, Distribution, or Use I. National Technology Transfer and Advancement Act J. Executive Order 12898: Federal Actions to Address Environmental Justice in Minority Populations and Low

- Income Populations***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 10 of 225

I . General Information

A . Summary of Costs and Benefits Consistent with the recently issued Executive Order 13563, ―Improving Regulation an d Regulatory Review,‖ we have estimated the
cost s and benefits of the proposed rule. The estimated net benefits of the proposed rule at a 3 percent discount rate are $ 66 to $ 176

m illion or $ 56 to $ 156 m illion at a 7 percent discount rate. Table 2 is a summ ary of the results of the analysis. Table 2 . Summary of the Estimated Annual Monetized Benefits, Social Costs, and Net Benefits for the Proposed Rule in 201 5 (Millions of 20 10 $) a 3% Discount Rate 7% Discount Rate Total Monetized Benefits b $ 70 to $180 $ 60 to $ 160 Total Social Cost s c $ 4. 0 $ 4.3 Net Benefits $ 66 to $ 1 76 $ 56 to $ 1 56 Non

- monetized Benefits Reduced exposure to Hazardous Air Pollutants (HAP) , including Manganese, polycyclic aromatic hydrocarbons (PAH), Chromium, Arsenic, Nickel, and Mercury a All estimates are for implementation year 2015 ( the benefit estimates use 2016 values as an approximation ); and are rounded to two or three (when more detail is needed) s ignificant figures so numbers may not sum across columns. All fine particles are ass umed to have equivalent health effects, but the benefit

- per - ton (BPT) estimates vary because each ton of precursor reduced has a different propensity to become particulate matter ( PM ) 2.5 . T hese benefits incorporate the conversion from precursor emissions to ambient fine particles. The BPT estimates are based on recent air quality modeling specific to the ferroalloys sector. b All estimates are for 2016, which we use as an approximation for impacts in 2015. c The compliance costs of the proposal serve as a proxy for the social costs. The compliance costs are estimated using a 7% interest rate.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 11 of 225 Under the proposed amendments, ferroalloys production facilities are expected to incur $11.4 million in capital costs to install new air pollution controls and new or improved continuous monitoring systems . We have estimated the annualized c osts to be $4.0 million, which includes estimated monitoring and testing costs. S ection V.C of this preamble contains more detail on these estimated cost impacts.
B . What are NESHAP ? 1. What is the statutory authority for this action? Section 112 of the Clean Air Act ( CAA ) establishes a two

- stage regulatory process to address emissions of HAP from stationary sources. In the first stage, after the EPA has identified categories of sou rces emitting one or more of the HAP listed in CAA section 112(b), CAA section 112(d) calls for us to promulgate n ational technology

- based e mission s tandards for h azardous a ir p ollutants ( NESHAP ) for those sources. ―Major sources‖ are those that emit or
ha ve the potential to emit 10 tons per year ( tpy ) or more of a single HAP or 25 tpy or more of any combination of HAP. For major sources, these technology

- based standards must reflect the maximum degree of emissions reductions of HAP achievable (after consid ering cost, energy requirements, and non a ir quality health and environmental impacts) and are commonly referred to as maximum achievable control technology (MACT) standards. MACT standards must require the maximum degree of emissions reduction achievable t hrough the application of measures, processes,***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 12 of 225 methods, systems, or techniques, including, but not limited to,

measures that ( 1 ) reduce the volume of or eliminate pollutants through process changes, substitution of materials or other modifications ; ( 2 ) enc lose systems or processes to eliminate emissions ; ( 3 ) capture or treat pollutants when released from a process, stack, storage, or fugitive emissions point ; ( 4 ) are design, equipment, work practice, or operational standards (including requirements for oper ator training or certification) ; or ( 5 ) are a combination of the above
. CAA section 112(d)(2)(A)

- (E ). The MACT standards may take the form of design, equipment, work practice, or operational standards where EPA first determines either that, ( 1 ) a pollutant cannot be emitted through a conveyance designed and constructed to emit or capture the pollutants, or that any requirement for, or use of, such a conveyance would be inconsistent with law ; or ( 2 ) the application of measurement methodology to a particular class of sources is not practicable due to technological and economic limitations
. CAA sections 112(h)(1)

- (2 ). The MACT ―floor‖ is the minimum control level allowed for MACT standards promulgated under CAA section 112(d)(3) , and may not be based on cost co nsiderations. For new sources, the MACT floor cannot be less stringent than the emissions control that is achieved in practice by the best

- controlled similar source. The MACT floors for existing sources can be less stringent than floors for new sources, bu t they cannot be less stringent than the average emissions***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 13 of 225 limitation achieved by the best

- performing 12 percent of existing sources in the category or subcategory (or the best

- performing five sources for categories or subcategories with fewer than 30 sour ces). In developing MACT standards, we must also consider control options that are more stringent than the floor. We may establish standards more stringent than the floor based on consideration s of the cost of achieving the emissions reductions, any non

- ai r quality health and environmental impacts, and energy requirements. The EPA is then required to review these technology

- based standards and revise them ―as necessary (taking into account developments in practices, processes, and control technologies)‖ no less frequently than every 8 years, under CAA section 112(d)(6). In conducting this review, the EPA is not obliged to completely recalculate the prior MACT determination. NRDC v. EPA , 529 F.3d 1077, 1084 (D. C. Cir., 2008). The second stage in standard

- se tting focuses on reducing any remaining ( i.e. , ―residual‖ ) risk according to CAA section 112(f). This provision require s , first, that EPA prepare a Report to Congress discussing (among other things) methods of calculating the risks posed (or potentially po sed) by sources after implementation of the MACT standards, the public health significance of those risks, and the EPA‘s recommendations as to legislation regarding such remaining risk. The EPA prepared and submitted this report ( Residual Risk Report to Co ngress , EPA

– 453/R

– 99

– 001) in March 1999. Congress did not***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 14 of 225 act in response to the report, thereby triggering the EPA‘s obligation under CAA section 112(f)(2) to analyze and address residual risk.
CAA s ection 112(f)(2) requires us to determine for source
cat egories subject to certain MACT standards, whether th os e emissions standards provide an ample margin of safety to protect public health. If the MACT standards for HAP ―classified as a known, probable, or possible human carcinogen do not reduce lifetime exc ess cancer risks to the individual most exposed to emissions from a source in the category or subcategory to less than one in one million,‖ the EPA must promulgate residual risk standards for the source category (or subcategory) , as necessary to provide an ample margin of safety to protect public health
. In doing so, the EPA may adopt standards equal to existing MACT standards if the EPA determines that the existing standards are sufficiently protective
. NRDC v. EPA , 529 F.3d 1077, 1083 (D .C. Cir. 2008)
. (― If EPA determines that the existing technol ogy - based standards provide an ―ample margin of safety,‖ then the Agency is free to readopt those standards during the residual risk rulemaking.‖) The EPA must also adopt more stringent standards, if necessary, to prevent an adverse environmental effect, 1 but mus t consider cost, energy, safety and other relevant factors in doing so
.

1 ―Adverse environmental effect‖ is defined in CAA section 112(a)(7) as any significant and widespread adverse effect, which may be reasonably anticipated to wildlife, aquatic life or natural resources, including***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 1 5 of 225 Section 112(f)(2) of the CAA expressly preserve s our use of the
two

- step process for developing standards to address any residual ris k and our interpretation of ―ample margin of safety‖ developed in
the National Emissions Standards for Hazardous Air Pollutants: Benzene Emissions from Maleic Anhydride Plants, Ethylbenzene/Styrene Plants, Benzene Storage Vessels, Benzene Equipment Leaks, and Coke By

- Product Recovery Plants (Benzene NESHAP) (54 Federal Register ( FR ) 38044, September 14, 1989). The first step in this process is the determination of acceptable risk. The second step provides for an ample margin of safety to protect public heal th, which is the level at which the standards are to be set (unless a n even more stringent standard is necessary to prevent, taking into consideration costs, energy, safety, and other relevant factors, an adverse environmental effect). The terms ―individua l most exposed,‖ ―acceptable level‖ and ―ample margin of safety‖ are not specifically defined in the CAA. However, CAA section 112(f)(2)(B) preserves EPA‘s interpretation set
out in the Benzene NESHAP, and the U nited States Court of Appeals for the D istric t of Columbia Circuit in NRDC v. EPA , 529 F.3d 1077 , concluded that EPA‘s interpretation of sub section 112(f)(2) is a reasonable one. See NRDC v. EPA , 529 F.3d at 1083 (D.C. Cir. 2008), which says ―[S]ubsection 112(f)(2)(B) expressly incorporates EPA‘s

adverse i mpacts on populations of endangered or threatened species or significant degradation of environmental qualities over broad areas.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 16 of 225 int erpretation of the Clean Air Act from the Benzene standard, complete with a citation to the Federal Register. ‖ See also, A Legislative History of the Clean Air Act Amendments of 1990 , volume 1, p. 877 (Senate debate on Conference Report). We also notified Congress in the Residual Risk Report to Congress that we intended to use the Benzene NESHAP approach in making CAA section 112(f) residual risk determinations (EPA

– 453/R

– 99

– 001, p. ES

– 11). In the Benzene NESHAP, we stated as an overall objective: * * * in protecting public health with an ample margin of safety, we strive to provide maximum feasible protection against risks to health from hazardous air pollutants by (1) protecting the greatest number of persons possible to an individual lifetime risk level n o higher than approximately 1

- in

- 1 million; and (2) limiting to no higher than approximately 1

- in

- 10 thousand [ i.e. , 100

- in

- 1 million] the estimated risk that a person living near a facility would have if he or she were exposed to the maximum pollutant con centrations for 70 years. The Agency also stated that, ―The EPA also considers incidence (the number of persons estimated to suffer cancer or other serious health effects as a result of exposure to a pollutant) to be an important measure of the health ri sk to the exposed population. Incidence measures the extent of health risks to the exposed population as a whole, by providing an estimate of the occurrence of cancer or other serious health effects in the exposed population.‖ The Agency went on to conclud e that ―estimated incidence would be weighed along with other health risk information in judging acceptability.‖ As explained more fully in our Residual Risk Report to Congress , the EPA does not define ―rigid line[s] of***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 17 of 225 acceptability,‖ but rather considers broad objectives to be weighed with a series of other health measures and factors (EPA

– 453/R

– 99

– 001, p. ES

– 11). The determination of what represents an ―acceptable‖ risk is based on a judgment of ―what risks are acceptable in the world in which we live‖ ( Residual Risk Report to Congress , p. 178, quoting the Vinyl Chloride decision at 824 F.2d 1165) recognizing that our world is not risk

- free. In the Benzene NESHAP, we stated that ―EPA will generally presume that if the risk to [the maximum exposed] individ ual is no higher than approximately one in 10 thousand, that risk level is considered acceptable.‖ 54 FR 38045. We discussed the maximum individual lifetime cancer risk (or maximum individual risk (MIR)) as being ―the estimated risk that a person living ne ar a plant would have if he or she were exposed to the maximum pollutant concentrations for 70 years.‖ Id
. We explained that this measure of risk ―is an estimate of the upper bound of risk based on conservative assumptions, such as continuous exposure for 24 hours per day for 70 years.‖ Id
. We acknowledge that maximum individual lifetime cancer risk ―does not necessarily reflect the true risk, but displays a conservative risk level which is an upper

- bound that is unlikely to be exceeded.‖ Id. Understanding that there are both benefits and limitations to using maximum individual lifetime cancer risk as a metric for determining acceptability, we acknowledged in the 1989 Benzene NESHAP***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 18 of 225 that ―consideration of maximum individual risk * * * must take into
account the strengths and weaknesses of this measure of risk.‖ Id
. Consequently, the presumptive risk level of 100 in one million ( one in 10 thousand) provides a benchmark for judging the acceptability of maximum individual lifetime cancer risk, but does not cons titute a rigid line for making that determination. The Agency also explained in the 1989 Benzene NESHAP the following: ―In establishing a presumption for MIR, rather than a rigid line for acceptability, the Agency intends to weigh it with a series of othe r health measures and factors. These include the overall incidence of cancer or other serious health effects within the exposed population, the numbers of persons exposed within each individual lifetime risk range and associated incidence within, typically , a 50

- kilometer (km) exposure radius around facilities, the science policy assumptions and estimation uncertainties associated with the risk measures, weight of the scientific evidence for human health effects, other quantified or unquantified health effe cts, effects due to co

- location of facilities, and co

- emissions of pollutants.‖ Id
. In some cases, these health measures and factors taken together may provide a more realistic description of the magnitude of risk in the exposed population than that provid ed by maximum individual lifetime cancer risk alone. As explained in the Benzene NESHAP, ―[e]ven though the risks judged  ̳ acceptable ‘ by EPA in the first step***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 19 of 225 of the Vinyl Chloride inquiry are already low, the second step of the inquiry, determining an  ̳ am ple margin of safety, ‘ again includes consideration of all of the health factors, and whether to reduce the risks even further.‖ I n the ample margin of safety decision process, the Agency again considers all of the health risks and other health information considered in the first step. Beyond that information, additional factors relating to the appropriate level of control will also be considered, including costs and economic impacts of controls, technological feasibility, uncertainties, and any other relev ant factors. Considering all of these factors, the Agency will establish the standard at a level that provides an ample margin of safety to protect the public health, as required by CAA section 112(f)
. 54 FR 38046
. 2. How do we consider the risk results in making decisions? As discussed in the previous section of this preamble, we apply
a two

- step process for developing standards to address residual risk. In the first step, the EPA determines if risks are acceptable. This determination ―considers all health information, including risk estimation uncertainty, and includes a presumptive limit on maximum individual lifetime [cancer] risk (MIR) 2 of approximately one in 10 thousand [ i.e. , 100 in one million].‖ 54 FR 38045. In the second step of the process, the E PA sets the standard at a level that provides an

2 Although defined as ―maximum individual risk,‖ MIR refers only to cancer risk. MIR, one metric for assessing cancer risk, is the estimated risk were an individual exposed to the maximum level of a pollutant for a lifetime.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 20 of 225 ample margin of safety ―in consideration of all health information, including the number of persons at risk levels higher than approximately one in one million, as well as other relevant factors, including c osts and economic impacts, technological feasibility, and other factors relevant to each particular decision.‖ Id. In past residual risk determinations, the EPA presented a number of human health risk metrics associated with emissions from the category un der review, including: t he MIR; the numbers of persons in various risk ranges; cancer incidence; the maximum noncancer hazard index (HI); and the maximum acute noncancer hazard. In estimating risks, the EPA considered sources under review that are located near each other and that affect the same population. The EPA developed risk estimates based on the actual emissions from the source category under review as well as based on the maximum emissions allowed pursuant to the source category MACT standard. The E PA also discussed and considered risk estimation uncertainties. The EPA is providing this same type of information in support of these actions. The Agency acknowledges that the Benzene NESHAP provides flexibility regarding what factors the EPA might consid er in making our determinations and how they might be weighed for each source category. In responding to comment on our policy under the Benzene NESHAP, the EPA explained that: ―The policy chosen by the Administrator permits consideration of multiple measu res of health risk. Not only can the MIR figure be considered, but also incidence,***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 21 of 225 the presence of noncancer health effects, and the uncertainties of the risk estimates. In this way, the effect on the most exposed individuals can be reviewed as well as the impact on the general public. These factors can then be weighed in each individual case. This approach complies with the Vinyl Chloride mandate that the Administrator ascertain an acceptable level of risk to the public by employing [her] expertise to asse ss available data. It also complies with the Congressional intent behind the CAA, which did not exclude the use of any particular measure of public health risk from the EPA's consideration with respect to CAA section 112 regulations, and, thereby, implicit ly permits consideration of any and all measures of health risk which the Administrator, in [her] judgment, believes are appropriate to determining what will  ̳protect the public health.‘‖ For example, the level of the MIR is only one factor to be weighed in determining acceptability of risks. The Benzene NESHAP explains ―an MIR of approximately one in 10 thousand should ordinarily be the upper end of the range of acceptability. As risks increase above this benchmark, they become presumptively less acceptab le under CAA section 112, and would be weighed with the other health risk measures and information in making an overall judgment on acceptability. Or, the Agency may find, in a particular case, that a risk that includes MIR less than the presumptively acce ptable level is unacceptable in the light of other health risk factors.‖ Similarly, with regard to the ample margin of safety analysis, the***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 22 of 225 Benzene NESHAP states that: ―EPA believes the relative weight of the many factors that can be considered in selectin g an ample margin of safety can only be determined for each specific source category. This occurs mainly because technological and economic factors (along with the health

- related factors) vary from source category to source category.‖
C . Does this action apply to me? The regulated industrial source category that is the subject of this proposal is listed in Table 3 . Table 3 of this preamble is not intended to be exhaustive, but rather provides a guide for readers regarding the entities likely to be affecte d by this proposed action.
Th e proposed standard s , once finalized, will be directly applicable to affected sources. Federal, s tate , local, and tribal government entities are not affected by this proposed action. As defined in the MACT (major source) source category list ing report published by the EPA in 1992, the ―Ferroalloys Production‖ source category is any facility engaged in producing ferroalloys such as ferrosilicon, ferromanganese, and ferrochrome
. 3 Subsequently, the EPA redefined the
MACT source cat egory when it promulgated the Ferroalloy MACT standard so that it now includes only major sources that produce products containing manganese. ( 64 FR 27450 , May 20, 1999 ) The MACT standard

3 EPA. Documentation for Developing the Initial Source Category List

– Final Report , EPA/OAQPS, EPA

- 450/3

- 91

- 030, July, 1992.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 23 of 225 applies specifically to two ferroalloy product types: ferromanganese and silicomanganese.
Table 3
. N ESHAP and Industrial Source Categories Affected By This Proposed Action Source Category NESHAP NAICS code 1 MACT

code 2 Ferroalloys Production Ferroalloys Production 331112 0 3 0 4

1 North American Industry Classification Sy stem 2 Maximum Achievable Control Technology D . Where can I get a copy of this document and other related information ? In addition to being available in the docket, an electronic copy of this proposal will also be available on the World Wide Web (WWW) thr ough the EPA‘s Technology Transfer Network (TTN). Following signature by the EPA Administrator, a copy of this proposed action will be posted on the TTN‘s policy and guidance page for newly proposed or promulgated rules at the following address: http://www .epa.gov/ttn/atw/rrisk/rtrpg.html . The TTN provides information and technology exchange in various areas of air pollution control. Supporting documents and other relevant information including a version of the regulatory text showing specific proposed chan ges is located in the docket (EPA

- HQ

- OAR

- 2010

- 0895). Additional information is available on the residual risk and technology review (RTR) webpage at : http://www.epa.gov/ttn/atw/rrisk/rtrpg.html . This information includes source category descriptions and de tailed emissions***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 24 of 225 estimates and other data that were used as inputs to the risk
assessment.
E . What should I consider as I prepare my comments for EPA? Submitting CBI . Do not submit information containing CBI to EPA through http:// www.regulations.gov or e - m ail. Clearly mark the part or all of the information that you claim to be CBI. For CBI information on a disk or CD

- ROM that you mail to EPA, mark the outside of the disk or CD

- ROM as CBI and then identify electronically within the disk or CD

- ROM the specif ic information that is claimed as
CBI. In addition to one complete version of the comment s that includes information claimed as CBI, a copy of the comment s that does not contain the information claimed as CBI must be submitted for inclusion in the public d ocket. If you submit a CD

- ROM or disk that does not contain CBI, mark the outside of the disk or CD

- ROM clearly that it does not contain CBI. Information not marked as CBI will be included in the public docket and EPA‘s electronic public docket without pri or notice. Information marked as CBI will not be disclosed except in accordance with procedures set forth in 40 Code of Federal Regulations ( CFR ) part 2. Send or deliver information identified as CBI only to the following address: Roberto Morales, OAQPS Do cument Control Officer (C404

- 02), OAQPS , U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711, Attention Docket ID Number EPA

- HQ

- OAR

- 201 0

- 0 895
. II . Background***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 25 of 225
A. What is this source category and how did the 1999 MACT standards regulate its HAP emissions? The NESHAP (or MACT rule ) for Ferroalloys Production: Ferromanganese and Silicomanganese was promulgated on May 20, 1999 (6 4 FR 27450 ) and codified at 40 CFR part 63, subpart XX X. 4 The 199 9
NESHAP applies to all new and existin g ferroalloys production facilities that manufacture ferromanganese or silicomangan e se and are major sources or are co

- located at major sources of HAP emissions
. The rule‘s product

- specific applicability reflected the fact that there was only one known maj or source within the Ferroalloys Production source category at the time of promulgation . Since then, one other major source of silicomanganese has started production , but it was permitted as an existing source
. Today , there are two ferroalloys production f acilit ies subject to the MACT rule. No greenfield manganese ferroalloys production facilities have been built in over 20 years, and we anticipate no greenfield manganese ferroalloys production fac ilities in the foreseeable future, although one facility is currently exploring expanding operations through the addition of a new furnace
. Ferroalloys are alloys of iron in which one or more chemical elements (such as chromium, manganese, and silicon) are added into molten metal. Ferroalloys are consumed primarily in iron and steel

4 The emission limits were revi sed on March 22, 2001 (66 FR 16024) in response to a petition for reconsideration submitted to EPA following promulgation of the final rule, and a petition for review filed in the U.S. Court of Appeals for the District of Columbia Circuit.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 26 of 225 making and are used to produce steel and cast iron products with enhanced or special properties.
F erroalloys within the scope of this source category are produced using submerged electric arc furnaces , which are furnaces in which the el ectrodes are submerged into the charge. The submerged arc process is a reduction smelting operation. The reactants consist of metallic ores (ferrous oxides, silicon oxides, manganese oxides, etc.) and a carbon

- source reducing agent, usually in the form of coke, charcoal, high

- and low

- volatility coal, or wood chips. Raw materials are crushed and sized , and then conveyed to a mix house for weighing and blending. Conveyors, buckets, skip hoists, or cars transport the processed material to hoppers above the fu rnace. The mix is gravity

- fed through a feed chute either continuously or intermittently, as needed. At high temperatures in the reaction zone, the carbon source reacts with metal oxides to form carbon monoxide and to reduce the ores to base metal. 5 The mo lten material (product and slag) is tapped from the furnace, sometimes subject to post

furnace refining, and poured into casting beds on the furnace room floor. Once the material hardens, it is transported to product crushing and sizing systems and package d for transport to the
customer.

5 EPA. AP

- 42, 12 .4. Ferroalloy Production. 10/86

.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 27 of 225 HAP generating processes include e lectrometallurgical (furnace) operations ( smelting and tapping) , o ther furnace room operations (ladle treatment and casting) , b uilding fugitives , r aw material handling and p roduct handling
. HAP are emitted from ferroalloys production as process emissions, process fugitive emissions, and outdoor fugitive dust emissions. Process emissions are the exhaust gases from the control devices, primarily the furnace control device, metal oxygen refini ng control device and c rushing operations control device
. The HAP in process emissions are primarily composed of metals (mostly manganese, arsenic, nickel, lead , mercury and chromium ) and also may include organic compounds that result from incomplete combu stion of coal , coke or other fuel that is charged to the furnaces as a reducing agent . There are also process metal HAP emissions from the product crushing control devices. Process fugitive emissions occur at various points during the smelting process (suc h as during charging and tapping of furnaces and casting ) and are assumed to be similar in composition to the process emissions. Outdoor f ugitive dust emissions result from the entrainment of HAP in ambient air due to material handling, vehicle traffic, wi nd erosion from storage piles , and other various activities. Outdoor f ugitive dust emissions are composed of metal HAP only
. The MACT rule applies to process emissions from the submerged arc furnaces, the metal oxygen refining process, and the product***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 28 of 225

crus hing equipment , process fugitive emissions from the furnace and outdoor fugitive dust emissions sources such as roadways, yard areas, and outdoor material storage and transfer operations. For process sources, the NESHAP specifies numerical emissions limits for particulate matter (as a surrogate for metal HAP) from the electric ( submerged ) arc furnaces (including smelting and tapping emissions) , with the specific limits depending on furnace type, size, and product being made. Particulate matter emission limi ts (again as a surrogate for metal HAP) are also in place for process emissions from the metal oxygen refining process and product crushing and screening equipment. Table 4 is a summary of the applicable limits.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review ***

Table 4
. Emission Limits in Subpart XXX

N ew or Reconstructed or Existing Source Affected Source Applicable PM Em i ssion Standards Subpart XXX Refe re nce

New or reconstructed Submerged arc furnace 0.23 kilograms per hour per megawatt (k g /hr/MW) (0.51 pounds per hour per megawatt (lb/hr/MW) or 35 milligrams per dry standard cubic meter (mg/dscm) (0.015 grains per dry standard cubic foot (gr/dscf) 40 CFR 63.1652(a)(1) and ( a )(2)

Existing Open submerged arc furnace producing ferromanganese and operating at a furnace power input of 22 megawatts ( MW ) or less 9.8 kg/hr (21.7 lb/hr) 40 CFR 63.1652(b)( 1 )

Existing Open submerged arc furnace producing ferromanganese and operating at a furnace power input greater than 22 MW 13.5 kg/hr (29.8 lb/hr) 40 CFR 63.1652(b)(2)

Existing Open submerged arc furnace producing silicomanganese and operating at a furnace power input greater than 25 MW 16.3 kg/hr (35.9 lb/hr) 40 CFR 63.1652(b)(3)***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 30 of 225

N ew or Reconstructed or Existing Source Affected Source Applicable PM Em i ssion Standards Subpart XXX Refe re nce
Existing Open submerged arc furnace producing silicomanganese and operating at a furnace power input of 25 MW or less 12.3 k g/hr (27.2 lb/hr) 40 CFR 63.1652(b)(4)

Existing Semi

- sealed submerged arc furnace (primary, tapping, and vent stacks) producing ferromanganese 11.2 kg/hr (24.7 lb/hr) 40 CFR 63.1652(c)

New, reconstructed, or existing Metal oxygen refining process 69 mg /dscm (0.03 gr/dscf) 40 CFR 63.1652(d)
New or reconstructed Individual equipment associated with the product crushing and screening operation 50 mg/dscm (0.022 gr/dscf) 40 CFR 63.1652(e)(1)

Existing Individual equipment associated with the product crushi ng and screening operation 69 mg/dscm (0.03 gr/dscf) 40 CFR 63.1652(e)(2)***E.O. 12866 Review

– Draft (10/03/2011)

– Do Not Cite, Quote or Release During Review *** Page 31 of 233 The 199 9 NESHAP established a building opacity l imit of 20 percent that is measured during the required furnace control device performance test. The rule provides an excursion lim it of 60 percent opacity for one 6

- m i nute period during the performance test. The opacity observation is focused only on emissions exiting the shop due solely to operations of any affected submerged arc furnace. In addition, blowing taps, poling and oxygen lancing of the tap hole; burndowns associated with electrode measurements; and maintenance activities associated with submerged arc furnaces and casting operations are exempt from the opacity standards specified in § 63.1653.
For outdoor fugitive dust sour ces, as defined in § 63. 165 2 , the 199 9 NESHAP require s that plants prepare and operate according to a n outdoor fugitive dust control plan that describes in detail the measures that will be put in p l ace to control outdoor fugitive dust emissions from the ind ividual outdoor fugitive dust sources at the facility. The owner or operator must submit a copy of the outdoor fugitive dust control plan to the designated permitting authority on or before the applicable compliance dat e . B. What data collection activitie s were conducted to support this action?
In April 2010, we issued an information collection request (ICR), pursuant to CAA section 114, to the two companies that own and operate the two known ferroalloys production facilities producing***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 32 of 225 ferromanganese and s ilicomanganese
. The ICR requested available information regarding process equipment, control devices, point and fugitive emissions, practices used to control fugitive emissions, and other aspects of facility operations. The two companies completed the

surv eys for their facilities and submitted the responses to us in the fall of 2010. We also requested that the two facilities conduct additional emissions tests in 2010 for certain HAP from specific processes that were considered representative of the industry
. Additional emissions testing was performed for most HAP metals, hydrochloric acid (HCl) , hydrofluoric acid (HF) , formaldehyde,
mercury , and PAH . The results of these tests were submitted to the EPA in the fall of 2010 and are available in the docket for this action. During the development of this regulation we discovered other types of ferroalloys production facilities (e.g., non

- manganese ferroalloy production) that are not subject to this NESHAP
. W e plan
to gather additional information on these other t ypes of sources, and then evaluate whether we need to establish MACT standards for these

sources . C . What other relevant background information from previous studies on ferroalloys emissions is available? Based on historical emissions data from EPA‘s Toxic s Release Inventory, one of the manganese ferroalloys facilities in this source***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 33 of 225 category 6 has been one of the highest

- emitters of manganese in the country for at least fifteen years. (http://www.epa.gov/enviro/facts/tri/index.html) Several agencies
have co nducted studies of the emissions from this facility and potential health effects of those emissions. The Agency for Toxic Substances and Disease Registry (ATSDR), of the U.S. Department of Health and Human Services, along with the Ohio Department of Health and the Ohio Environmental Protection Agency conducted three health consultations in the communities surrounding this manganese ferroalloys facilit y between 2004 and 2007. The investigations found ambient concentrations of manganese at levels higher than background concentrations and higher than health benchmark concentrations. As a result of these findings, a health study of chronic adult exposure to ambient manganese in the communities surrounding the facility was funded by the EPA . The preliminary resul ts of the health study indicate that, within the study population, test results were within the average range of the general population, and did not indicate a relationship between blood manganese levels and neurological test measurements for the study sub jects. More information about these studies can be found at http://www.atsdr.cdc.gov/sites/washington_marietta/index.html

. Under EPA‘s School Air Toxics Initiative , a mbient concentrations of manganese were monitored at three schools located near the

6 Eramet Marrietta, located in Marietta, Ohio.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 34 of 225 ferroa lloys production facility in late 2009. At these locations, manganese concentrations above the health benchmark value were observed. More information about the health benchmark value is available in s ection III.B
. M ore information on the School Air Toxics Initiative can be found at epa.gov/schoolair/index/html.
III . Analyses Performed In this section , we describe the analyses performed to support the proposed decisions for the RTR for this source ca tegory.
A. How did we address unregulated emissions sources ? In the course of evaluating the F erroalloys P roduction source category, we identified certain HAP for which we failed to establish emission standards in the original MACT. See National Lime v. EPA , 233 F. 3d 625, 634 (D.C. Cir. 2000) (EPA has ―clear stat utory obligation to set emissions standards for each listed HAP‖). Specifically, w e identified and evaluat ed emissions standards for four HAP (or groups of HAP) , described below, that are not specifically regulated in the existing 199 9 MACT standard , or ar e only regulated for certain emissions points
. As described below, for these HAP (or groups of HAP ) , we are proposing emissions limits pursuant to 112(d) (2) and 112(d) (3). The results and proposed decisions based on the analys e s performed pursuant to CAA s ection 112(d) (2) and 112(d) (3) are presented in s ection I V .A of this preamble. 1. Acid Gases (Hydrochloric Acid and Hydrofluoric Acid )***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 35 of 225 We were unaware of the potential for HCl or HF emissions when we developed the 1999 NESHAP. As a result, we did not estab lish standards for HCl or HF for these sources in the 1999 NESHAP. We recently received information about HCl and HF HAP emissions based on emissions data received in response to the ICR, and we are now proposing to set emissions limits for these pollutant s. 2. M ercury The 199 9 NESHAP specified emissions limits for metal HAP ( e.g. , arsenic, nickel, chromium ) in terms of a particulate matter emissions limit ( i.e. , particulate matter is used as a surrogate for metal HAP that are mainly emitted in particulate form ). There is no explicit standard for mercury , and a significant fraction of the mercury emissions are expected to be in gaseous mercury forms (e.g., gaseous elemental mercury or gaseous oxidized mercury) with a smaller fraction in particulate form. The refore, we are proposing a standard specifically for mercury pursuant to section 112 (d) (2) and (d) (3) ( as described further in s ection I V .A of this preamble )
. 3. Poly cyclic A romatic Hydrocarbons
We did not establish standards for PAH emitted from submerge d arc furnaces in the 1999 NESHAP. Therefore, we are proposing a standard pursuant to section 112 (d) (2) and (d) (3) (as described further in section IV.A of this preamble). 4. Formaldehyde***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 36 of 225
We did not establish standards for formaldehyde emitted from submer ged arc furnaces in the 1999 NESHAP. Therefore, we are proposing a standard pursuant to section 112 (as described further in section IV.A of this preamble)
. B. How did we estimate risks posed by the source category? The EPA conducted a risk assessment that provided estimates of the MIR posed by the HAP emissions from each source in the source category, the HI for chronic exposures to HAP with the potential to cause noncancer health effects, and the hazard quotient ( HQ ) for acute exposures to HAP with the po tential to cause noncancer health effects. The assessment also provided estimates of the distribution of cancer risks within the expose d populations, cancer incidence and an evaluation of the potential for adverse environmental effects for each source cate gory. The risk assessment consisted of seven primary steps, as discussed below. The docket for this rulemaking contains the following document which provides more information on the risk assessment inputs and models: Draft Residual Risk Assessment for the Ferroalloys Production Source Categor y . The methods used to assess risks (as described in the seven primary steps below) are consistent with those peer

- reviewed by a panel of the EPA‘s Science Advisory Board (SAB) in 2009 and described in their peer review report issued***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 37 of 225 in 2010 7 ; they are also consistent with the key recommendations contained in that report. 1. Establishing the Nature and Magnitude of Actual Emissions and Identifying the Emissions Release C haracteristics The two existing ferromanganese and silicomanganese production facilities constitute the dataset tha t is t he basis for the risk assessment. In addition to the quality assurance ( QA ) of the facilities contained in the dataset, we also checked the coordinates of every emission source in the da taset through visual observations using tools such as GoogleEarth and ArcView. Where coordinates were found to be incorrect, we identified and corrected them to the extent possible. We also performed QA of the emissions data and release characteristics to ensure there were no outliers. 2. Establishing the Relationship between Actual Emissions and MACT

Allowable Emissions Levels The emissions data in the MACT dataset include estimates of the mass of emissions actually emitted during the specified annual time period. These ―actual‖ emission levels are often lower than the emission levels that a facility might be allowed to emit and still comply with the MACT standards. The emissions level allowed to be emitted by the MACT standards is referred to as the ―MACT

- allowable‖

7 U.S. EPA SAB. Risk and Technology Review (RTR) Risk Assessment Methodologies: For Review by the EPA‘s Science Advisory Board with Case Studies

– MACT I Petroleum Refining S ources and Portland Cement Manufacturing , May 2010.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 38 of 225 emissions level. This represents the highest emissions level that could be emitted by facilities without violating the MACT standards
. We discussed the use of both MACT

- allowable and actual emissions in the final Coke Oven Batteries residual ri sk rule (70 FR 19998

– 19999, April 15, 2005) and in the proposed and final Hazardous Organic NESHAP residual risk rules (71 FR 34428, June 14, 2006, and 71 FR 76609, December 21, 2006, respectively). In those previous actions, we noted that assessing the ri sks at the MACT

- allowable level is inherently reasonable because these risks reflect the maximum level sources could emit and still comply with national emission standards. But we also explained that it is reasonable to consider actual emissions, where suc h data are available, in both steps of the risk analysis, in accordance with the Benzene NESHAP. (54 FR 38044, September 14, 1989.) For the Ferroalloys Production source category, we evaluated allowable stack emissions, based on the level of control requir ed by the MACT standards compared to the level of reported actual emissions and available information on the level of control achieved by the emissions control s in use. Further explanation is provided in the technical document: Draft Development of the RTR Emissions Dataset for the Ferroalloys Production Source Category , which is available in the docket
. 3. Conducting Dispersion Modeling, Determining Inhalation Exposures, and Estimating Individual and Population Inhalation Risks***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 39 of 225 Both long

- term and short

- te rm inhalation exposure concentrations and health risks from the source category addressed in this proposal were estimated using the Human Exposure Model (Community and Sector
HEM

- 3 version 1.1.0). The HEM

- 3 performs three of the primary risk
assessment act ivities listed above: (1) conducting dispersion modeling to estimate the concentrations of HAP in ambient air, (2) estimating long

- term and short

- term inhalation exposures to individuals residing within 50 km of the modeled sources, and (3) estimating indi vidual and population

- level inhalation risks using the exposure estimates and quantitative dose

- response information. The air dispersion model used by the HEM

- 3 model ( AERMOD ) is one of EPA‘s preferred models for assessing pollutant concentrations from ind ustrial facilities. 8 To perform the dispersion modeling and to develop the preliminary risk estimates, HEM

- 3 draws on three data libraries. The first is a library of meteorological data, which is used for dispersion calculations. This library includes 1 ye ar of hourly surface and upper air observations for 189 meteorological stations, selected to provide coverage of the United States and Puerto Rico. A second library , of United States Census Bureau census block 9 internal point locations and populations , pro vides the basis of human exposure calculations (Census, 2000) . In addition, for each

8 U.S. EPA. Revision to the Guideline on Air Quality Models: Adoption of a Preferred General Purpose (Flat and Complex Terrain) Dispersion Model and Other Revisions (70 FR 68218, November 9, 2005). 9 A census block is the smallest geographic area for which census statistics are tabulated.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 40 of 225 census block, the census library includes the elevation and controlling hill height, which are also used in dispersion calculations. A third library of pollutant unit risk factors and other health benchmarks is used to estimate health risks. These risk factors and health benchmarks are the latest values recommended by the EPA for HAP and other toxic air pollutants. These values are available at http://www.epa.gov/ttn/atw/to xsource/summary.html and are discussed in more detail later in this section. In developing the risk assessment for chronic exposures, we used the estimated annual average ambient air concentration s of each of the HAP emitted by each source for which we hav e emissions data in the source category. The air concentrations at each nearby census block centroid were used as a surrogate for the chronic inhalation exposure concentration for all the people who reside in that census block. We calculated the MIR for ea ch facilit y as the cancer risk associated with a continuous lifetime (24 hours per day, 7 days per week, and 52 weeks per year for a 70

- year period) exposure to the maximum concentration at the centroid of inhabited census block s . Individual cancer risks w ere calculated by multiplying the estimated lifetime exposure to the ambient concentration of each of the HAP (in micrograms per cubic met er ( μg/m 3 ) ) by its unit risk e stimate (URE), which is an upper bound estimate of an individual‘s probability of
contra cting cancer over a lifetime of exposure to a concentration of 1 microgram of the pollutant per cubic meter of air. F or residual***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 41 of 225 risk assessments, we generally use URE values from the EPA‘s Integrated Risk Information System (IRIS). For carcinogenic pollut ants without the EPA IRIS values, we look to other reputable sources of cancer dose

- response values, often using California EP A (CalEPA) URE values, where available. In cases where new, scientifically credible dose response values have been developed in a manner consistent with the EPA guidelines and have undergone a peer review process similar to that used by the EPA, we may use such dose

response values in place of, or in addition to, other values, if appropriate. Formaldehyde is a unique case. In 2004, the EPA determined that the Chemical Industry Institute of Toxicology ( CIIT ) cancer dose

response value for formaldehyde (5.5 x 10 - 9 per μg/m 3 ) was based on
better science than the IRIS cancer dose

- response value (1.3 x 10 - 5

per μg/m 3 ), and we switched from using the IRIS value to the CIIT value in risk assessments supporting regulatory actions. However, subsequent research published by the EPA suggests that the CIIT model was not appropriate and , in 2010 , the EPA returned to using the 1991 IRIS value, which is more health protective. 10 The EPA has been working on revising the formaldehyde IRIS assessment and the National Academy of Sciences (NAS) completed its review of the EPA‘s draft in May of 2011. The EPA is reviewing the public comment s and the NAS

10 For details on the justification for this decision, see the memorandum in the docket from Peter Preuss to Steve Page entitled, Recommendation for Formaldehyde Inhal ation Cancer Risk Values , January 22, 2010.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 42 of 225 independent scientific peer review, and the draft IRIS assessment will be revised and the final assessment will be posted on the IRIS databas e. In the interim, we will present findings using the 1991 IRIS value as a primary estimate, and may also consider other information as the science evolves. In the case of nickel compounds, to provide a conservative estimate of potential cancer risks, we u sed the URE value for nickel subsulfide in this assessment. Based on past scientific and technical considerations, the determination of the percent of nickel subsulfide was considered a major factor for estimating the extent and magnitude of the risks of c ancer due to nickel

- containing emissions. Nickel speciation information for some of the largest nickel

- emitting sources (including oil combustion, coal combustion, and others) suggested that at least 35 percent of the total nickel emissions may be soluble compounds and that the URE for the mixture of inhaled nickel compounds (based on nickel subsulfide, and representative of pure insoluble crystalline nickel) could be derived to reflect the assumption that 65 percent of the total mass of nickel may be carci nogenic. Based on more recent, consistent views of major scientific bodies (i.e., National Toxicology Program in their 12 th Report on Carcinogens, International Agency for Research on Cancer, and other international agencies) 11 that now consider all nickel

11 World Health Organization (WHO, 1991) and the Europea n Union‘s Scientific Committee o n Health and Environmental Risks (SCHER, 2006)
.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 43 of 225 compounds to be carcinogenic, we currently consider all nickel compounds to have the potential of being as carcinogenic as nickel subsulfide. To implement this approach in our inhalation risk assessments, we apply the IRIS URE for nickel subsulfide without a factor to reflect the assumption that 100 percent of the total mass of nickel may be as carcinogenic as pure nickel subsulfide. Based on the fact that there may be differences in toxicity and/or carcinogenic potential across the different nickel compoun ds, and given that there have been two URE values derived for exposure to mixtures of nickel compounds that are 2

- 3 fold lower than the IRIS URE for nickel subsulfide, we also consider it reasonable to use a value that is 50 percent of the IRIS URE for nic kel subsulfide for providing an estimate of the lower end of a plausible range of cancer potency values for different mixtures of nickel compounds. We also note that polycyclic organic matter (POM) (of which PAH are a subset) , a carcinogenic HAP with a mu tagenic mode of action, is emitted by the facilities in th is source category
. 12 For this compound

group, 13 the age

- dependent adjustment factors (ADAF) described in the EPA‘s Supplemental Guidance for Assessing Susceptibility from Early

-

12 U.S. EPA. Performing risk assessments that include carcinogens described in the Supplemental Guidance as having a mutagenic mode of action. Science Policy Council Cancer Guidelines Implementation Work Group Communication II : Memo from W.H. Farland, dated October 4, 2005. 13 See the Risk Assessment for Source Categories document av ailable in the docket for a list of HAP with a mutagenic mode of action.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 44 of 225 Life Exposure to Carci nogens 14 were applied. This adjustment has the effect of increasing the estimated lifetime risks for POM by a factor of 1.6. In addition, although only a small fraction of the total POM emissions were not reported as individual compounds, the EPA
expresses carcinogenic potency for compounds in this group in terms of benzo[a]pyrene equivalence, based on evidence that carcinogenic POM has the same mutagenic mechanism of action as benzo[a]pyrene. For this reason, the EPA‘s Science Policy Council 15 recommends app lying the Supplemental Guidance to all carcinogenic PAH for which risk estimates are based on relative potency. Accordingly, we have applied the ADAF to the benzo[a]pyrene equivalent portion of all POM mixtures. Incremental individual lifetime cancer risks associated with emissions from the two facilities in the source category were estimated as the sum of the risks for each of the carcinogenic HAP (including those classified as carcinogenic to humans, likely to be carcinogenic to humans, and suggestive evi dence of carcinogenic potential 16 ) emitted by the modeled source. Cancer incidence and the

14 U.S. EPA. Supplemental Guidance for Assessing Early

- Life Exposure to Carcinogens
. EPA/630/R

- 03/003F, 2005. http://www.epa.gov/ttn/atw/childrens_supplement_final.pdf. 15 U.S. EPA. Sci ence Policy Council Cancer Guidelines Implementation Workgroup Communication II : Memo from W.H. Farland, dated June 14, 2006. 16 These classifications also coincide with the terms "known carcinogen, probable carcinogen, and possible carcinogen," respectivel y, which are the terms advocated in the EPA's previous Guidelines for Carcinogen Risk Assessment , published in 1986 (51 FR 33992, September 24, 1986). Summing the risks of these individual compounds to obtain the cumulative cancer risks is an approach that was recommended by the EPA's Science Advisory Board ( SAB ) in their 2002 peer review of EPA's National Air***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 45 of 225 distribution of individual cancer risks for the population within 50 km of the source s were also estimated for the source category as part of th is assessment by summi ng individual risks. A distance of 50 km is consistent with both the analysis supporting the 1989 Benzene NESHAP (54 FR 38044) and the limitations of Gaussian dispersion models, including AERMOD.
To assess the risk of non

- cancer health effects from chroni c exposures, we summed the HQ for each of the HAP that affects a common target organ system to obtain the HI for that target organ system (or target organ

- specific HI, TOSHI). The HQ is the estimated exposure divided by the chronic reference value, which i s either the EPA reference concentration ( RfC ) , defined as ―an estimate (with uncertainty spanning perhaps an order of magnitude) of a continuous inhalation exposure to the human population (including sensitive subgroups) that is likely to be without an ap preciable risk of deleterious effects during a lifetime,‖ or, in cases where an RfC from the EPA‘s IRIS database is not available, the EPA will utilize the following prioritized sources for our chronic dose

- response values: (1) The Agency for Toxic Substan ces and Disease Registry Minimum Risk Level, which is defined as ―an estimate of daily human exposure to a substance that is likely to be without an appreciable risk of adverse effects (other than cancer) over a specified duration
Toxics Assessment ( NATA ) entitled, NATA

- Evaluating the National

- scale Air Toxics Assessment 1996 Data

-- an SAB Advisory , available at: http://yose mite.epa.gov/sab/sabproduct.nsf/214C6E915BB04E14852570CA007A682C/$File/e cadv02001.pdf.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 46 of 225 of exposure‖; (2) the Cal EPA Chronic Reference Exposure Level (REL), which is defined as ―the concentration level at or below which no adverse health effects are anticipated for a specified exposure duration‖; and (3), as noted above, in cases where scientifically credible dose

- re sponse values have been developed in a manner consistent with the EPA guidelines and have undergone a peer review process similar to that used by the EPA, we may use those dose

response values in place of or in concert with other values. Screening estimate s of acute exposures and risks were also evaluated for each of the HAP at the point of highest off

- site exposure for each facility ( i.e. , not just the census block centroids) , assuming that a person is located at this spot at a time when both the peak (hou rly) emission rate and worst

- case dispersion conditions (1991 calendar year data) occur. The acute HQ is the estimated acute exposure divided by the acute dose

- response value. In each case, acute HQ values were calculated using best available, short

- term d ose - response values. These acute dose

- response values, which are described below, include the acute REL, acute exposure guideline levels (AEGL) and emergency response planning guidelines ( ERPG ) for 1

- hour exposure durations. As discussed below, we used

con servative assumptions for emission rates, meteorology and exposure location for our acute analysis. As described in the CalEPA‘s Air Toxics Hot Spots Program Risk Assessment Guidelines, Part I, The Determination of Acute Reference***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 47 of 225 Exposure Levels for Airb orne Toxicants , an acute REL value (http:// www.oehha.ca.gov/air/pdf/acuterel.pdf ) is defined as ―the concentration level at or below which no adverse health effects are anticipated for a specified exposure duration. ‖ Acute REL values are based on the most sensitive, relevant, adverse health effect reported in the medical and toxicological literature. Acute REL values are designed to protect the most sensitive individuals in the population by the inclusion of margins of safety. Because margins of safety are incorporated to address data gaps and uncertainties, exceeding the REL does not automatically indicate an adverse health impact. AEGL values were derived in response to recommendations from the National Research Council (NRC). As described in Standing Oper ating Procedures (SOP) of the National Advisory Committee on Acute Exposure Guideline Levels for Hazardous Substances (http://www.epa.gov/opptintr/aegl/pubs/sop.pdf), 17 ―the NRC‘s previous name for acute exposure levels

— community emergency exposure levels

—

w as replaced by the term AEGL to reflect the broad application of these values to planning, response, and prevention in the community, the workplace, transportation, the military, and the remediation of Superfund sites.‖ This document also states that AEGL values ―represent threshold exposure limits for the general public and are applicable to emergency exposures ranging from 10 minutes to eight

17 NAS, 2001. Standing Operating Procedures for Developing Acute Exposure Levels for Hazardous Chemicals , page 2.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 48 of 225 hours.‖ The document lays out the purpose and objectives of AEGL by stating (page 21) that ―the primary purpose of the AEGL program and the National Advisory Committee for Acute Exposure Guideline Levels for Hazardous Substances is to develop guideline levels for once

- in

a - lifetime, short

- term exposures to airborne concentrations of acutely toxic, high

- priority chemic als.‖ In detailing the intended application of AEGL values, the document states (page 31) that ―[i]t is anticipated that the AEGL values will be used for regulatory and nonregulatory purposes by U.S. Federal and state agencies and possibly the internationa l community in conjunction with chemical emergency response, planning, and prevention programs. More specifically, the AEGL values will be used for conducting various risk assessments to aid in the development of emergency preparedness and prevention plans , as well as real

- time emergency response actions, for accidental chemical releases at fixed facilities and from transport carriers.‖ The AEGL

– 1 value is then specifically defined as ―the airborne concentration of a substance above which it is predicted th at the general population, including susceptible individuals, could experience notable discomfort, irritation, or certain asymptomatic nonsensory effects. However, the effects are not disabling and are transient and reversible upon cessation of exposure.‖ The document also notes (page 3) that, ―Airborne concentrations below AEGL

– 1 represent exposure levels that can produce mild and progressively***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 49 of 225 increasing but transient and nondisabling odor, taste, and sensory irritation or certain asymptomatic, nonsensory effects.‖ Similarly, the document defines AEGL

– 2 values as ―the airborne concentration (expressed as parts per million or milligrams per cubic meter of a substance above which it is predicted that the general population, including susceptible individuals, could experience irreversible or other serious, long

- lasting adverse health effects or an impaired ability to escape.‖ ERPG values are derived for use in emergency response, as described in the American Industrial Hygiene Association‘s document entitled, Emergency Response Planning Guidelines (ERPG) Procedures and Responsibilities ( http://www.aiha.org/1documents/committees/ERPSOPs2006.pdf ) which states that, ―Emergency Response Planning Guidelines were developed for emergency planning and are intended as h ealth based guideline concentrations for single exposures to chemicals.‖ 18 The ERPG

– 1 value is defined as ―the maximum airborne concentration below which it is believed that nearly all individuals could be exposed for up to 1 hour without experiencing other than mild transient adverse health effects or without perceiving a clearly defined, objectionable odor.‖ Similarly, the ERPG

– 2 value is defined as ―the maximum airborne concentration below which it is believed that nearly all individuals

18 ERP Committee Procedures and Responsibilities . Novembe r 1, 2006. American Industrial Hygiene Association.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 50 of 225 could be exposed for up to 1 hour without experiencing or developing irreversible or other serious health effects or symptoms which could impair an individual‘s ability to take protective action.‖ As can be seen from the definitions above, the AEGL and ERPG values include the similarly

- defined severity levels 1 and 2. For many chemicals, a severity level 1 value AEGL or ERPG has not been developed because the types of effects for these chemicals are not consistent with the AEGL

- 1/ERPG

- 1 definitions ; in these instances, high er severity level AEGL

– 2 or ERPG

– 2 values are compared to our modeled exposure levels to screen for potential acute concerns. When
AEGL

- 1/ERPG

- 1 values are available, they are used in our acute risk
assessments. Acute REL values for 1

- hour exposure duratio ns are typically lower than their corresponding AEGL

– 1 and ERPG

– 1 values. Even though their definitions are slightly different, AEGL

– 1 values are often the same as the corresponding ERPG

– 1 values, and AEGL

– 2 values are often equal to ERPG

– 2 values. Maximum HQ values from our acute screening risk assessments typically result when basing them on the acute REL value for a particular pollutant. In cases where our maximum acute HQ value exceeds 1, we also report the HQ value based on the next highest acute dose

- response value (usually the AEGL

– 1 and/or the
ERPG

– 1 value).
T o develop screening estimates of acute exposures in the absence of hourly emissions data , generally we first develop estimates of***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 51 of 225 maximum hourly emissions rates by multiplying the average actual annual hourly emissions rates by a default factor to cover routinely variable emissions. We cho o se the factor to use based on process knowledge and engineering judgment and with awareness of a Texas study of short

- term emissions variability, which showed that most peak emissions events, in a heavily

- industrialized 4

- county area (Harris, Galveston, Chambers, and Brazoria c ounties, Texas) were less than twice the annual average hourly emissions rate. The highest peak emissions event was 74 times the annual a verage hourly emissions rate, and the 99 th percentile ratio of peak hourly emissions rate to the annual average hourly emissions rate was 9. 19 This analysis is provided in the Draft Residual Risk Assessment for the Ferroalloys Production Source C a tegory , wh ich is available in the docket for this action. Considering this analysis , to account for more than 99 percent of the peak hourly emissions, we apply a conservative screening multiplication factor of 10 to the average annual hourly emissions rate in our ac ute exposure screening assessments as our default approach
. However, w e use a factor other than 10 if we have information that indicates that a different factor is appropriate for a particular source category. For the F erroalloys Production source category hourly emissions estimates were available for individual emissions points, so we did not use the default factor of 10.

19 See http://www.tceq.state.tx.us/compliance/field_ops/eer/index.html or docket to access the source of these data.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 52 of 225 As part of our acute risk assessment process, for cases where acute HQ values from the screening step were less than or equal to 1,

ac ute impacts were deemed negligible and no further analysis was performed. In cases where an acute HQ from the screening step was greater than 1, additional site

- specific data were considered to develop a more refined estimate of the potential for acute imp acts of

concern. For this source category, t he data refinements employed consisted of using the site

- specific facility layout to distinguish facility property from an area where the public could be exposed. These refinements are discussed in the draft risk assessment document, which is available in the docket for this source category. Ideally, we would prefer to have continuous measurements over time to see how the emissions vary by each hour over an entire year. Having a frequency distribution of hourly em ission rates over a year would allow us to perform a probabilistic analysis to estimate potential threshold exceedances and their frequency of occurrence. Such an evaluation could include a more complete statistical treatment of the key parameters and elem ents adopted in this screening analysis. However, we recognize that having this level of data is rare, hence our use of the multiplier approach. To better characterize the potential health risks associated with estimated acute exposures to HAP, and in resp onse to a key recommendation from the SAB‘s peer review of the EPA‘s RTR risk***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 53 of 225 assessment methodologies , 20 we generally examine a wider range of available acute health metrics ( e.g. , RELs, AEGLs) than we do for our chronic risk assessments. This is in respon se to the SAB‘s acknowledgement that there are generally more data gaps and inconsistencies in acute reference values than there are in chronic reference values
. In some cases, when Reference Value Arrays 21 for HAP have been developed, we consider additiona l acute values (i.e., occupational and international values) to provide a more complete risk characterization. 4. Conducting Multipathway Exposure and Risk Modeling The potential for significant human health risks due to exposures via routes other than inh alation ( i.e. , multipathway exposures) and the potential for adverse environmental impacts were evaluated in a three

- step process. In the first step, we determined whether any facilities emitted any PB

- HAP ( HAP known to be persistent and bio

- accumulative i n the environment ). There are 14 PB

- HAP compounds or compound classes identified for this screening in EPA‘s Air Toxics Risk Assessment Library (available at http://www.epa.gov/ttn/fera/risk_atra_vol1.html ). They are cadmium compounds, chlordane, chlorinat ed dibenzodioxins and furans,

20 The SAB peer review of RTR Risk Assessment Methodologies is available at: http://yose mite.epa.gov/sab/sabproduct.nsf/4AB3966E263D943A8525771F00668381/$File/E PA

- SAB

- 10

- 007

- unsigned.pdf. 21 U.S. EPA. (2009) Chapter 2.9 Chemical Specific Reference Values for Formaldehyde in Graphical Arrays of Chemical

- Specific Health Effect Reference Values f or Inhalation Exposures (Final Report). U.S. Environmental Protection Agency, Washington, DC, EPA/600/R

- 09/061, and available on

- line at http://cfpub.epa.gov/ncea/cfm/recordisplay.cfm?deid=211003***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 54 of 225 dichlorodiphenyldichloroethylene, heptachlor, hexachlorobenzene, hexachlorocyclohexane, lead compounds, mercury compounds, methoxychlor, polychlorinated biphenyls, POM, toxaph ene and trifluralin.
Because one or more of these PB

- HAP are emitted by at least one facility in the source categor y , we proceeded to the second step of the evaluation. In this step, we determined whether the facility

specific emission rates of each of the emitted PB

– HAP were large enough to create the po tential for significant non

- inhalation human or environmental risks under reasonable worst

- case conditions. To facilitate this step, we have developed emission rate thresholds for each PB

– HAP using a hypothetical worst

- case screening exposure scenario deve loped for use in conjunction with the EPA‘s Total Risk Integrated Methodology.Fate, Transport, and Ecological Exposure ( TRIM.FaTE ) model. The hypothetical screening scenario was subjected to a sensitivity analysis to ensure that its key design parameters

w ere established such that environmental media concentrations were not underestimated ( i.e. , to minimize th e occurrence of false negatives or results that suggest that risks might be acceptable when, in fact, actual risks are high) and to also minimize the occurrence of false positives for human health endpoints. We call this application of the TRIM.FaTE model TRIM

- Screen. The facility

specific emission rates of each of the PB

– HAP in the source category were compared to the TRIM

- Screen emission threshold val ues for each***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 55 of 225 of the PB

– HAP identified in the source category datasets to assess the potential for significant human health risks or environmental risks via non

- inhalation pathways. 5. Assessing Risks Considering Emissions Control Options In addition to as sessing baseline inhalation risks and screening for potential multipathway risks, we also estimated risks considering the potential emissions reductions that would be achieved by the main control option s under consideration. In these cases, t he expected

em issions reductions were applied to the specific HAP and emissions points in the source category dataset to develop correspondi ng estimates of risk reductions. 6. Conducting Other Risk

- Related Analyses : Facility w ide Assessments To put the source category r isks in context, we typically examine the risks from the entire ―facility,‖ where the facility includes all HAP

- emitting operations within a contiguous area and under common control. In other words, we examine the HAP emissions not only from the source cat egory of interest, but also emissions of HAP from all other emissions sources at the facility for which we have data
. However, for the Ferroalloys Production source category, there are no other significant HAP emissions sources operating at present. Thus, there was no need to perform a separate facility wide risk assessment.
7 . Considering Uncertainties in Risk Assessment***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 56 of 225 Uncertainty and the potential for bias are inherent in all risk assessments, including those performed for the source category addressed in this proposal. Although uncertainty exists, we believe th at our approach, which used conservative tools and assumptions, ensures that our decisions are health

- protective. A brief discussion of the uncertainties in the emissions dataset, dispersion model ing, inhalation exposure estimates and dose

- response relationships f ollows below. A more thorough discussion of these uncertainties is included in the risk assessment documentation ( Draft Residual Risk Assessment for the Ferroalloys Production Source Categ ory ) available in the docket for this action. a. Uncertainties in the Emissions Dataset Although the development of the RTR dataset involved quality assurance/quality control processes, the accuracy of emissions values will vary depending on the source of the data, the degree to which data are incomplete or missing, the degree to which assumptions made to complete the datasets are accurate, errors were made in estimating emissions values and other factors. The emission estimates considered in this analysis generally are annual totals for certain years that do not reflect short

- term fluctuations during the course of a year or variations from year to year. The estimates of peak hourly emissions rates from stacks for the acute effects screening assessment wer e based on actual maximum hourly emissions estimates for individual emission points , which is***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 57 of 225 intended to account for emissions fluctuations due to normal facility operations. b. Uncertainties in Dispersion Modeling While the analysis employed the EPA‘s re commended regulatory dispersion model, AERMOD, we recognize that there is uncertainty in ambient concentration estimates associated with any model, including AERMOD. In circumstances where we had to choose between various model options, where possible, mod el options ( e.g. , rural/urban, plume depletion, chemistry) were selected to provide an overestimate of ambient air concentrations of the HAP rather than underestimates. However, because of practicality and data limitation reasons, some factors ( e.g. , meteo rology, building downwash) have the potential in some situations to overestimate or underestimate ambient impacts. For example, meteorological data were taken from a single year (1991) and facility locations can be a significant distance from the site wher e these data were taken. Despite these uncertainties, we believe that at off

- site locations and census block centroids, the approach considered in the dispersion modeling analysis should generally yield overestimates of ambient HAP concentrations.
c. Uncer tainties in Inhalation Exposure The effects of human mobility on exposures were not included in the assessment. Specifically, short

- term mobility and long

- term mobility between census blocks in the modeling domain were not***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 58 of 225
considered. 22 The assumption of n ot considering short or long

- term population mobility does not bias the estimate of the theoretical
MIR , nor does it affect the estimate of cancer incidence because the total population number remains the same. It does, however, affect the shape of the dis tribution of individual risks across the affected population, shifting it toward higher estimated individual risks at the upper end and reducing the number of people estimated to be at lower risks, thereby increasing the estimated number of people at speci fic high risk levels ( e.g. , one in 10,000 or one in one million)
. In addition, the assessment predicted the chronic exposures at the centroid of each populated census block as surrogates for the exposure concentrations for all people living in that block. Using the census block centroid to predict chronic exposures tends to over

predict exposures for people in the census block who live farther from the facility and under

- predict exposures for people in the census block who live closer to the facility. Thus , using the census block centroid to predict chronic exposures may lead to a potential understatement or overstatement of the true maximum impact, but is an unbiased estimate of average risk and incidence. The assessment evaluate s the cancer inhalation ri sks associated with pollutant exposures over a 70

- year period, which is the assumed

22 Short

- term mobility is movement from one micro

- environment to another over the course of hours or days. Long

- term mobility is movement from one residence to another over the course of a lifetime.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 59 of 225 lifetime of an individual. In reality, both the length of time that modeled emissions sources at facilities actually operate ( i.e. , more or less than 70 years), and the dom estic growth or decline of the modeled industry ( i.e. , the increase or decrease in the number or size of United States facilities), will influence the future risks posed by a given source or source category. Depending on the characteristics of the industry , these factors will, in most cases, result in an overestimate both in individual risk levels and in the total estimated number of cancer cases. However, in rare cases, where a facility maintains or increases its emissions levels beyond 70 years, residents live beyond 70 years at the same location, and the residents spend most of their days at that location, then the risks could potentially be underestimated. Annual cancer incidence estimates from exposures to emissions from these sources would not be affec ted by uncertainty in the length of time emissions sources operate. The exposure estimates used in these analyses assume chronic exposures to ambient levels of pollutants. Because most people spend the majority of their time indoors, actual exposures may not be as high, depending on the characteristics of the pollutants modeled. For many of the HAP, indoor levels are roughly equivalent to ambient levels, but for very reactive pollutants or larger particles, these***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 60 of 225 levels are typically lower. This factor has the potential to result in an overstatement of 25 to 30 percent of exposures. 23 In addition to the uncertainties highlighted above, there are several factors specific to the acute exposure assessment that should be highlighted. The accuracy of an acute in halation exposure assessment depends on the simultaneous occurrence of independent factors that may vary greatly, such as hourly emissions rates, meteorology, and human activity patterns. In this assessment, we assume that individuals remain for 1 hour at the point of maximum ambient concentration as determined by the co

- occurrence of peak emissions and worst

- case meteorological conditions. These assumptions would tend to be worst

- case actual exposures as it is unlikely that a person would be located at the point of maximum exposure during the time of worst

- case impact. d. Uncertainties in Dose

- Response Relationships There are uncertainties inherent in the development of the dose

response values used in our risk assessments for cancer effects from chronic ex posures and non

- cancer effects from both chronic and acute
exposures. S ome uncertainties may be considered quantitatively, and others generally are expressed in qualitative terms. We note as a preface to this discussion a point on dose

- response uncertainty that is brought out in EPA‘s 2005 Cancer Guidelines ; namely, that ―the

23 U.S. EPA. National

- Scale Air Toxics Assessment for 1996 . (EPA 453/R

– 01

– 003; January 2001; page 85.)***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 61 of 225 primary goal of EPA actions is protection of human health; accordingly, as an Agency policy, risk assessment procedures, including default options that are used in the absence of scien tific data to the contrary, should be health protective‖ ( EPA 2005 Cancer Guidelines , pages 1

– 7). This is the approach followed here as summarized in the next several paragraphs. A complete detailed discussion of uncertainties and variability in dose

- respo nse relationships is given in the residual risk documentation which is available in the docket for this action. Cancer URE values used in our risk assessments are those that have been developed to generally provide an upper bound estimate of risk. That is , they represent a ―plausible upper limit to the true value of a quantity‖ (although this is usually not a true statistical confidence limit). 24 In some circumstances, the true risk could be as low as zero; however, in other circumstances the risk could be greater. 25 When developing an upper bound estimate of risk and to provide risk values that do not underestimate risk, health

- protective default approaches are generally used. To err on the side of ensuring adequate health protection, EPA typically uses the upper bound estimates rather than lower bound or central tendency estimates in our risk assessments, an approach that may have limitations for other uses (e.g., priority

- setting or expected benefits analysis).

24 IRIS glossary (http://www.epa.gov/NCEA/iris/help_gloss.htm). 25 An exception to this is the URE for benzene, which is considered to cover a range of values, each end of which is considered to be equally plausible, and which is based on maximum likelihood estimates.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 62 of 225 Chronic non

- cancer reference (RfC ) and refere nce dose ( RfD) values represent chronic exposure levels that are intended to be health

- protective levels. Specifically, these values provide an estimate (with uncertainty spanning perhaps an order of magnitude) of a continuous inhalation exposure (RfC) or a daily oral exposure (RfD) to the human population (including sensitive subgroups) that is likely to be without an appreciable risk of deleterious effects during a lifetime. To derive values that are intended to be ―without appreciable risk,‖ the methodol ogy relies upon an uncertainty factor (UF) approach (U.S. EPA, 1993, 1994) which considers uncertainty, variability and gaps in the available data. The UF are applied to derive reference values that are intended to protect against appreciable risk of delet erious effects. The UF are commonly default values, 26 e.g., factors of 10 or 3, used in the absence of compound

specific data; where data are available, UF may also be developed using compound

- specific information. When data are limited, more assumptions ar e needed and more UF are used. Thus, there may be a

26 Ac cording to the NRC report, Science and Judgment in Risk Assessment (NRC, 1994) ―[Default] options are generic approaches, based on general scientific knowledge and policy judgment, that are applied to various elements of the risk assessment process when th e correct scientific model is unknown or uncertain.‖ The 1983 NRC report, Risk Assessment in the Federal Government: Managing the Process , defined default option as ―the option chosen on the basis of risk assessment policy that appears to be the best choic e in the absence of data to the contrary‖ (NRC, 1983a, p. 63). Therefore, default options are not rules that bind the Agency; rather, the Agency may depart from them in evaluating the risks posed by a specific substance when it believes this to be appropri ate. In keeping with EPA‘s goal of protecting public health and the environment, default assumptions are used to ensure that risk to chemicals is not underestimated (although defaults are not intended to overtly overestimate risk). See EPA, 2004, An Examin ation of EPA Risk Assessment Principles and Practices , EPA/100/B

– 04/001 available at: http://www.epa.gov/osa/pdfs/ratf

- final.pdf.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 63 of 225 greater tendency to overestimate risk in the sense that further study might support development of reference values that are higher ( i.e. , less potent) because fewer default assumptions are needed. Howeve r, for some pollutants, it is possible that risks may be underestimated. While collectively termed ―UF,‖ these factors account for a number of different quantitative considerations when using observed animal (usually rodent) or human toxicity data in the d evelopment of the RfC. The UF are intended to account for: (1) variation in susceptibility among the members of the human population ( i.e. , inter

- individual variability); (2) uncertainty in extrapolating from experimental animal data to humans (i.e., inter species differences); (3) uncertainty in extrapolating from data obtained in a study with less

- than

- lifetime exposure ( i.e. , extrapolating from sub

- chronic to chronic exposure); (4) uncertainty in extrapolating the observed data to obtain an estimate of th e exposure associated with no adverse effects; and (5) uncertainty when the database is incomplete or there are problems with the applicability of available studies. Many of the UF used to account for variability and uncertainty in the development of acute reference values are quite similar to those developed for chronic durations, but they more often use individual UF values that may be less than 10. The UF are applied based on chemical

- specific or health effect

- specific information ( e.g. , simple irritatio n effects do not vary appreciably between human individuals, hence a value of 3 is typically used), or based on the purpose for the reference value***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 64 of 225 (see the following paragraph). The UF applied in acute reference value derivation include: (1) heterogeneity among humans; (2) uncertainty in extrapolating from animals to humans; (3) uncertainty in lowest observed adverse effect (exposure) level to no observed adverse effect (exposure) level adjustments; and (4) uncertainty in accounting for an incomplete datab ase on toxic effects of potential concern. Additional adjustments are often applied to account for uncertainty in extrapolation from observations at one exposure duration ( e.g. , 4 hours) to derive an acute reference value at another exposure duration (e.g. , 1 hour). Not all acute reference values are developed for the same purpose and care must be taken when interpreting the results of an acute assessment of human health effects relative to the reference value or values being exceeded. Where relevant to th e estimated exposures, the lack of short

- term dose

- response values at different levels of severity should be factored into the risk characterization as potential uncertainties. Although every effort is made to identify peer

- reviewed reference values for c ancer and noncancer effects for all pollutants emitted by the sources included in this assessment, some HAP continue to have no reference values for cancer or chronic noncancer or acute effects. Because exposures to these pollutants cannot be included in

a quantitative risk estimate, an understatement of risk for these pollutants at environmental exposure levels is possible. For a group***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 65 of 225 of compounds that are either unspeciated or do not have reference values for every individual compound ( e.g. , glycol ether s), we conservatively use the most protective reference value to estimate risk from individual compounds in the group of compounds. Additionally, chronic reference values for several of the compounds included in this assessment are currently under the EPA IRIS review and revised assessments may determine that these pollutants are more or less potent than the current value. We may re

evaluate residual risks for the final rulemaking if these reviews are completed prior to our taking final action for this sou rce category and a dose

- response metric changes enough to indicate that the risk assessment supporting this notice may significantly understate human health risk.

e . Uncertainties in the Multi p athway and Environmental Effects
Assessment We generally assume that when exposure levels are not anticipated to adversely affect human health, they also are not anticipated to adversely affect the environment. For each source category, we generally rely on the site

- specific levels of PB

- HAP emissions to determine whe ther a full assessment of the multipathway and environmental effects is necessary. Our screening methods use
worst

- case scenarios to determine whether multipathway impacts might be important. The results of such a process are biased high for the purpose of screening out potential impacts. Thus, when individual***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 66 of 225 pollutants or facilities screen out, we are confident that the potential for multipathway impacts is negligible. On the other hand, when individual pollutants or facilities do not screen out, it does not mean that multipollutant impacts are significant, only that we cannot rule out that possibility.
C. How did we consider the risk results in making decisions for this proposal?
In evaluating and developing standards under section 112(f)(2),

a s discussed in s ection I. B of this preamble, we apply a two

- step process to address residual risk. In the first step, the EPA determines whether risks are acceptable. This determination ―considers all health information, including risk estimation uncertainty, and inc ludes a presumptive limit on maximum individual lifetime [cancer] risk (MIR) 27 of approximately one in 10 thousand [ i.e., 100 in one million]‖ ( 54 FR 38045 )
. In the second step of the
process, the EPA sets the standard at a level that provides an ample
marg in of safety ―in consideration of all health information, including the number of persons at risk levels higher than approximately one in one million, as well as other relevant factors, including costs and economic impacts, technological feasibility, and

o ther factors relevant to each particular decision
. ‖ ( Id
. )

27 Although defined as ―maximum individual risk,‖ MIR refers only to cancer risk. MIR, one metric for assessing cancer risk, is the estimated risk were an individual exposed to the maximum level of a pollutant for a lifetime.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 67 of 225 In past residual risk actions, the EPA has presented and considered a number of human health risk metrics associated with emissions from the category under review, including: the MIR; the numbers of persons in various risk ranges; cancer incidence; the maximum non

- cancer HI; and the maximum acute non

- cancer hazard ( 72 FR 25138, May 3, 2007; 71 FR 42724, July 27, 2006) . In most recent proposals (75 FR 65068, October 21, 2010 ; 75 FR 80220, December 21, 2010 ; and 76 FR 29032, May 19, 2011 ), the EPA also presented and considered additional measures of health information, such as estimates of the risks associated with the maximum level of emissions which might be allowed by the current MACT standards ( see, e.g., 75 FR 65068, October 21, 2010 and 75 FR 80220, December 21, 2010). The EPA also discussed and considered risk estimation uncertainties. The EPA is providing this same type of information in support of the proposed actions described in this Federal R egister notice. The Agency is considering all available health information to inform our determinations of risk acceptability and ample margin of safety under CAA section 112(f). Specifically, as explained in the Benzene NESHAP, ― the first step judgment on acceptability cannot be reduced to any single factor‖ and thus ―[t]he Administrator believes that the acceptability of risk under [previous] section 112 is best judged on the basis of a broad set of health risk measures and information‖ ( 54 FR 38046 )
. Sim ilarly, with regard to making the ample margin of safety determination, as stated in the Benzene NESHAP***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 68 of 225 ―[ i n the ample margin decision, the Agency again considers all of the health risk and other health information considered in the first step. Beyond that information, additional factors relating to the appropriate level of control will also be considered, including cost and economic impacts of controls, technological feasibility, uncertainties, and any other relevant factors.‖ Id.
T he Agency acknowledges t ha t the Benzene NESHAP provides flexibility regarding what factors EPA might consider in making determinations and how the se factors might be weighed for each source category. In responding to comment on our policy under the Benzene NESHAP, the EPA explain ed that: ―The policy chosen by the Administrator permits consideration of multiple measures of health risk. Not only can the MIR figure be considered, but also incidence, the presence of non

- cancer health effects, and the uncertainties of the risk estimate s. In this way, the effect on the most exposed individuals can be reviewed as well as the impact on the general public. These factors can then be weighed in each individual case. This approach complies with the Vinyl Chloride mandate that the Administrator ascertain an acceptable level of risk to the public by employing [her] expertise to assess available data. It also complies with the Congressional intent behind the CAA, which did not exclude the use of any particular measure of public health risk from th e EPA's consideration with respect to CAA section 112 regulations, and, thereby, implicitly permits consideration of any and all measures of***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 69 of 225 health risk which the Administrator, in [her] judgment, believes are appropriate to determining what will  ̳protect the public health‘‖ ( 54 FR at 38057 )
. Thus , the level of the MIR is only one factor to be weighed in determining acceptability of risks. The Benzene NESHAP explained that ―an MIR of approximately one in 10 thousand should ordinarily be the upper end of the range of acceptability. As risks increase above this benchmark, they become presumptively less acceptable under CAA section 112, and would be weighed with the other health risk measures and information in making an overall judgment on acceptability. Or,
t he Agency may find, in a particular case, that a risk that includes MIR less than the presumptively acceptable level is unacceptable in the light of other health risk factors‖ ( Id. at 38045 )
. Similarly, with regard to the ample margin of safety analysis, t he EPA stated in the Benzene NESHAP that: ―... EPA believes the relative weight of the many factors that can be considered in selecting an ample margin of safety can only be determined for each specific source category. This occurs mainly because technologic al and economic factors (along with the health

- related factors) vary from source category to source category‖ ( Id. at 38061 )
. The EPA wishes to point out that certain health information has not been considered to date in making residual risk determinations
. In assessing risks to populations in the vicinity of the facilities in each category, we present estimates of risk associated with HAP***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 70 of 225 emissions from the source category alone (source category risk estimates) , and generally we have also assessed risks du e to HAP emissions from the entire facility at which the covered sourc e category is located (facility wide risk estimates). We have not , however, attempt ed to characterize the risks associated with all HAP emissions impacting the populations living near the sources in these categories. That is, at this time, we do not attempt to quantify those HAP risks that may be associated with emissions from other facilities that do not include the source categories in question, mobile source emissions, natural source em issions, persistent environmental pollution, or atmospheric transformation in the vicinity of the sources in these categories. The Agency understands the potential importance of considering an individual‘s total exposure to HAP in addition to considering

e xposure to HAP emissions from the source category and facility. This is particularly important when assessing non

- cancer risks, where pollutant

- specific exposure health reference levels ( e.g. , RfC s ) are based on the assumption that thresholds exist for adv erse health effects. For example, the Agency recognizes that, although exposures attributable to emissions from a source category or facility alone may not indicate the potential for increased risk of adverse non

cancer health effects in a population, the exposures resulting from emissions from the facility in combination with emissions from all of the other sources ( e.g., other facilities) to which an individual is***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 71 of 225 exposed may be sufficient to result in increased risk of adverse non

cancer health effects. In May 2010, the EPA SAB advised us ―... that RTR assessments will be most useful to decision makers and communities if results are presented in the broader context of aggregate and cumulative risks, including background concentrations and contributions from other sources in the area.‖ 28 Although we are interested in placing source category and facilitywide HAP risks in the context of total HAP risks from all sources combined in the vicinity of each source, we are concerned about the uncertainties of doing so . At this point, we believe that such estimates of total HAP risks will have significantly greater associated uncertainties than for the source category or facilitywide estimates, and hence would compound the uncertainty in any such comparison. This is bec ause we have not conducted a detailed technical review of HAP emissions data for source categories and facilities that have not previously undergone an RTR review or are not currently undergoing such review. We are requesting comment on whether and how bes t to estimate and evaluate total HAP exposure in our assessments, and, in particular, on whether and how it might be appropriate to use information from EPA‘s NATA to support such estimates. We are also seeking comment on how best to consider

28 EPA‘s responses to this and all other key recommendations of the SAB‘s advisory on RTR risk assessment methodologies (which is available at: http://yosemi te.epa.gov/sab/sabproduct.nsf/4AB3966E263D943A8525771F00668381/$File/E PA

- SAB

- 10

- 007

- unsigned.pdf) are outlined in a memo to this rulemaking docket from David Guinnup entitled, EPA‘s Actions in Response to the Key Recommendations of the SAB Review of RTR Ri sk Assessment Methodologies
.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 72 of 225 various types and scales of risk estimates when making our acceptability and ample margin of safety determinations under CAA section 112(f).
D . How did we perform the technology review? Our technology review focused on the identification and evaluation of developments in practices, processes, and control technologies that have occurred since the 199 9 NESHAP was promulgated
. In cases where the technology review identified such developments, we conduct ed an analysis of the technical feasibility of applying these developm ents, along with the estimated impacts (costs, emissions reductions, risk reductions, etc.) of applying these developments . We then ma d e decision s on whether it is necessary
to propose amend ments to the 1999 NESHAP to require any of the identified developm ents. Based on our analyses of the data and information collected by the ICR and our general understanding of the industry and other available information on potential controls for this industry , we identif ied several potential developments in practices, p rocesses, and control technologies. For the purpose of this exercise, we considered any of the following to be a ―development‖: Any add

- on control technology or other equipment that was not identified and considered during development of the 199 9 NESHAP . A ny improvements in add

- on control technology or other equipment (that were identified and considered during development of the 199 9 NESHAP ) that could result in significant additional emissions reduction
.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 73 of 225 Any work practice or operational procedure that was not identified or considered during development of the 199 9 NESHAP . Any process change or pollution prevention alternative that could be broadly applied to the industry and that was not identified or considered during development of the 199 9 NESHAP .

In a ddition to reviewing the practices, processes, or control technologies that were not considered at the time we developed the 199 9 NESHAP , we reviewed a variety of data sources in our evaluation of whether there were additional practices, processes, or cont rols to consider for the F erroalloys P roduction industry
. Among the data

sources we reviewed were the NESHAP for various industries that were promulgated after the 199 9 NESHAP. We reviewed the regulatory requirements and/or technical analyses associated wi th these regulatory actions to identify any practices, processes, and control technologies considered in these efforts that could possibly be applied to emissions sources in the Ferroalloys Production source category , as well as the costs, non

- air impacts, and energy implications associated with the use of these technologies
. Additionally, w e requested information from facilit ies regarding developments in practices, processes, or control technology. Finally, we reviewed other information sources, such as S tate or local permitting agency databases and industry

- supported databases.
E . What other issues are we addressing in this proposal? In addition to the analyses described above, we also reviewed other aspects of the MACT standards for possible revision as***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 74 of 225 appropriate and necessary. Based on this review we have identified aspects of the MACT standards that we believe need revision
. This includes proposing revisions to the startup, shutdown, and malfunction (SSM) provisions of the MACT rule in order to ensur e that they are consistent with a recent court decision in Sierra Club v.
EPA , 551 F. 3d 1019 (D.C. Cir. 2008). In addition, we are proposing various other changes to monitoring and testing requirements to ensure that this rule includes the measures needed to ensure continuous compliance at major sources subject to the revised NESHAP for the Ferroalloys Production source category
. Our analyses and proposed decisions related to SSM and other testing and reporting requirements for this source category are pre sented in s ection IV.E of this preamble."
I V . Analy tical Results and Proposed Decisions This section of the preamble provides the results of our RTR for the Ferroalloys Production source category and our proposed decisions concerning changes to the 1999 NE SHAP. A. What are the results of our analyses and proposed decisions regarding unregulated pollutants? In this section, we describe how we calculate MACT floors and how we account for variability in those floor calculations. For more information on this a nalysis, see the Draft MACT Floor Analysis for the Ferroalloys Production Source Category which is available in the***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 75 of 225 docket for this proposed action. Based on the ICR data that we collected , we conducted a MACT Floor analysis. Note that we have detailed emi ssions data from one furnace and one crushing system baghouse at each plant (collected at the outlet of the control device). We are soliciting emissions data for the operating furnaces and crushing system baghouses for which we do not have data and any oth er emissions sources at ferroalloys production facilities and available information on the quantity and composition of process fugitive emissions. 1. Mercury Emissions Section 112(d)(3)(B) of the CAA requires that the MACT standards for existing sources b e at least as stringent as the average emissions limitation achieved by the best performing five sources (for which the Administrator has or could reasonably obtain emissions information) in a category with fewer than 30 sources. The Ferroalloy Production source category consists of fewer than 30 sources. Where, as here, there are five or fewer sources, we base the MACT floor limit on the average emissions limitation achieved by those sources for which we have data. The EPA must exercise its judgment, base d on an evaluation of the relevant factors and available data, to determine the level of emissions control that has been achieved by the best performing sources under variable conditions. It is recognized in the case law that EPA may consider variability i n estimating the degree of***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 76 of 225 emissions reduction achieved by best

- performing sources and in setting MACT floors. See Mossville Envt‘l Action Now v. EPA , 370 F.3d 1232, 1241

– 42 (D.C. Cir 2004) (holding EPA may consider emissions variability in estimating perf ormance achieved by best

- performing sources and may set the floor at a level that a best

- performing source can expect to meet ―every day and under all operating conditions‖). The raw materials used to produce ferroalloys contain various amounts of mercury, which is emitted during the smelting process. These mercury emissions are derived primarily from the manganese ore although there may be trace amounts in the coke or coal used in the smelting process. While some of the mercury that is in particulate or

ox idized forms is captured by the particulate control devices, the more volatile elemental mercury is largely emitted to the atmosphere. Pursuant to CAA section 112(d)(3), we are proposing to revise the 1999 NESHAP to include emission limits for mercury.
As discussed above, the MACT floor limit is calculated based on the average performance of the units in each category plus an amount to account for these units‘ variability. To account for variability in the operation and emissions, the stack test data were u sed to calculate the average emissions and the 99 percent upper predictive limit (UPL) to derive the MACT floor limit. For more information on how we calculated the MACT floors and other emission limits, see the***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 77 of 225 Ferroalloys Production MACT Floor Analysis d ocument, which is available in the docket. Using this method, the MACT floor (or 99 percent UPL) for exhaust mercury concentrations from existing furnaces is 80 μg/dscm at 2 percent carbon dioxide (CO 2 ). This MACT floor limit is higher than the actual emis sions measured during the ICR performance tests at each plant. Therefore, we anticipate that both of the existing sources would be able to meet this limit without installing additional controls. With regard to new sources, as described above, the MACT flo or for new sources cannot be less stringent than the emissions performance that is achieved in practice by the best

- controlled similar source. For this source category, we calculate that the MACT floor limit for new sources is 16 μg/dscm at 2 percent CO 2 . This limit is based on the performance of the best performing source. The next step in establishing MACT standards is the investigation of regulatory alternatives. We can select an alternative standard that is more stringent than the MACT floor level of co ntrol, if it is technically and economically achievable consistent with CAA section 112(d)(2). Therefore, we considered beyond

- the

- floor options to further reduce emissions of mercury. The option we considered is based on setting a MACT limit for existing sources based on the performance of the best performing source ( i.e. , based upon the test data used to calculate the MACT floor for new***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 78 of 225 sources) such that the MACT limit for existing sources would be the same as the MACT limit for new sources ( i.e. , 16 μg/ dscm). Compliance would be demonstrated by periodic performance testing and continuous parameter monitoring. We estimate that under this beyond the floor option, one facility would need to install additional controls such as activated carbon injection to m eet the limit of 16 ug/dscm, and that this would achieve about 420 pounds of reduction per year in mercury emissions. The capitol costs are estimated to be $1.7 million, annual costs to be $1.4 million, with an overall cost

effectiveness of $3,300 per poun d. Overall, we believe these controls are feasible and cost

- effective. Therefore, we are proposing a MACT limit for mercury emissions of 16 ug/dscm for both existing and new sources under the authority of sections 112(d)(2) and (d)(3). More information reg arding how the MACT limits were calculated and the costs is provided in Ferroalloys Production MACT Floor and Cost Memos, which are available in the docket for this rulemaking. T he proposed MACT limits and potential related issues are also described furthe r below under the technology review section of this preamble (section IV.D.4)
. Nevertheless, we are requesting comment on these proposed limits for mercury, including the costs and feasibility of meeting these limits, and whether these proposed standards a re appropriate for all types of manganese production operations or if subcategories should be considered for the mercury standard. Specifically, we understand***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 7 9 of 225 that the production of ferromanganese products requires substantially larger amounts of ore in th e furnace charge than does the production of silicomanganese product. A ton of ferromanganese product may require three to six times as much ore as a ton of silicomanganese product . As a result, the mercury concentration in the offgas may be higher as well . The emission data collected were from one furnace producing ferromanganese at one plant and from one furnace producing silicomanganese at another plant. We are requesting additional test data or analysis that could be used to determine if different stand ard s would be appropriate for ferromanganese production and silicomanganese production processes and what the level s th ose standard s should be. 2. Polycyclic Aromatic Hydrocarbons (PAHs) PAH emissions are products of incomplete combustion from the smelting operation, and a subset of the listed HAP POM. Some of these emissions are likely to be in particulate form, but a significant portion is expected to be in a gaseous form. Therefore, the existing particulate matter control devices only achieve partial con trol of these compounds. Nevertheless, the 1999 MACT does not include any standards specifically for PAH. Therefore, pursuant to CAA section 112(d)(3), we are proposing to revise the 1999 NESHAP to include an emission limit for PAH. We have stack test data from only one furnace for PAH emissions. As such, the MACT floor would be based on the performance level***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 80 of 225 achieved at that furnace ( i.e. , the average emissions of that furnace plus an amount to account for variability). Based on these data and applying the 99 percent UPL, we calculate that the MACT floor limit for PAHs would be 887 μg/dscm

. We also evaluated control performance that could be achieved via co

- control of mercury emissions with activated carbon injection as a beyond

- the

- floor option. Based on i nformation from carbon vendors, an activated carbon system that is designed to achieve a 90 percent reduction in mercury emissions (which we believe would be applied to meet the proposed mercury standard discussed above) should also achieve a high degree o f reduction in PAH with no additional costs. Assuming a 90 percent reduction from the calculated 99 percent UPL of 887 μg/dscm, the resulting limit would be 89 μg/dscm (see section IV. D .5 for more detail). Thus, a proposed limit for PAHs of 89 μg/dscm coul d be achieved with the same controls needed for mercury with no additional
costs. Therefore, pursuant to CAA sections 112(d)(2) and (d)(3), we are proposing to revise the 1999 NESHAP to include an emission limit for PAH of 89 μg/dscm for new and existing s ources . 3. Acid Gases As noted above, the 1999 MACT rule does not include standards for acid gases (HCl and HF). These acid gases are a product of combustion, and the level of emissions are dictated by the chlorine and fluorine content of the coal or coke used as a reducing agent in***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 81 of 225 the smelting process. Because the current rule has no limits for these HAP, pursuant to CAA section 112(d)(3), we are proposing to revise the 1999 NESHAP to include emission limits for acid gases. We estimate that the two facili ties in this source category emit 6 to 11 tpy of HCl, and 1 to 7 tpy of HF per facility, respectively. While these levels of emissions are nontrivial, they are relatively low compared to some other types of combustion sources. The primary reason for this i s that manganese producers use coke instead of coal as the primary reducing agent in the smelting operation. Because coke is a refined product, much of the original chlorine or fluorine content in the coal is removed in the coking process, which greatly

re duces potential emissions. Second, one of the five furnaces at these plants is equipped with a scrubber, which provides co

- control of particulate matter and acid gas emissions. Nevertheless, we believe it is appropriate to propose emission limits for these HAP in today‘s action. However, a number of the individual data points were reported as below the applicable test detection limit s . 29 The following discussion describes how we handle such data in our MACT calculations. Test method measurement imprecision i s a contributor to the variability of a set of emissions data. One element is associated with method detection capabilities and a second is a function of the

29 We conducted this analysis for all measured pollutant according to the following method when non detects were reported. However only the hydrochloric acid, hydrofluoric acid and formaldehyde data needed a detection limit corr ection to adequately account for variability, as described below.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 82 of 225 measurement value. Measurement imprecision is proportionally highest for values measured below or near a method‘s detection level and proportionally lower for values measured above the method detection level. The probability procedures applied in calculating the MACT floor

or beyond the floor emissions limit inherently and reasonably account for emiss ions data variability including measurement imprecision when the database represents multiple tests from multiple emissions units for which all of the data are measured significantly above the method detection level. This is less true when the database inc ludes emissions occurring below method detection capabilities that are reported as the method detection level values. The EPA‘s guidance to facilities for reporting pollutant emissions in response to the ICR data collection specified the criteria for deter mining test

- specific method detection levels. Those criteria ensure that there is only about a 1 percent probability of an error in deciding that the pollutant measured at the method detection level is present when in fact it was absent. Such a probability is also called a false positive or an alpha, Type I, error. Because of sample and emissions matrix effects, laboratory techniques, sample size, and other factors, method detection levels normally vary from test to test for any specific test method and pol lutant measurement. The expected measurement imprecision is 40 to 50 percent or greater at levels measured at the method detection***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 83 of 225 level or less
. The expected measurement imprecision decreases to a relative 10 to 15 percent for values measured at a level a bout three times the method detection level. 30 Also in accordance with our guidance, source owners identified emissions data which were measured below the method detection level and reported those values as equal to the method detection level as determined for that test. An effect of reporting data in this manner is that the resulting database is somewhat truncated at the lower end of the measurement range ( i.e. , no values reported below the test

specific method detection level). A MACT floor or beyond the f loor emissions limit based on a truncated database or otherwise including values measured near the method detection level may not adequately account for measurement imprecision contribution to the data variability. We applied the following procedures to ac count for the effect of measurement imprecision associated with a database that includes method detection level data. The following process also addresses the concerns associated with use of a small data set, such as the Ferroalloys Production data set for acid gases. As a first step, we reviewed an HCl emissions data set for the industrial boilers rule, which represents several hundred emissions tests used in the floor calculations ( i.e. , best performers) for the boilers rule to

30 American Society of Mechanical Engineers, Reference Method Accuracy and Precision (ReMAP): Phase 1, Precision of Manual Stack Emission Measurements , CRTD Vol. 60, February 2001.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 84 of 225 determine typical method de tection levels. We presume that data for the best performing units also reflect the capabilities of high quality testing companies and laboratories. Further, the method detection levels calculated from larger data sets are more representative of the inhere nt measurement variability both within and between testing companies than the limited Ferroalloys Production dataset. We believe that emissions tests conducted with these methods for most combustion operations ( e.g. , fossil fuel, biomass, and waste fired u nits; brick and clay kilns; Portland cement kilns), including ferroalloys production, should produce method detection levels very similar to the level of 60 μg/dscm that is the result of this review.
We assumed that the representative detection level ( RDL ) for HF would be the same as for HCl. The second step in the process was to calculate three times the RDL and compare that value to the calculated MACT floor or beyond the floor emissions limit. If three times the RDL w as less than the calculated MACT floo r emissions limit calculated from the UPL, we would conclude that measurement variability was adequately addressed. The calculated MACT floor or beyond the floor emissions limit would need no adjustment. If, on the other hand, the value equal to three time s the RDL was greater than the UPL, we would conclude that the calculated MACT floor or beyond the floor emissions limit does not account entirely for measurement variability. If indicated, we substituted the value equal to three times the RDL to apply as the***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 85 of 225 adjusted MACT floor or beyond the floor emissions limit. This adjusted value would ensure measurement variability is adequately addressed in the MACT floor or the beyond the floor emissions limit. For HCl, three times the RDL was less than the calculat ed 99 percent UPL for exhaust HCl concentration from existing furnaces. Thus, for existing sources, the MACT floor for HCl is set at the UPL, or 809 μg/dscm corrected to 2 percent CO 2 . Similarly, f or HF, three times the RDL was less than the calculated 99 percent UPL for exhaust HF concentration from existing furnaces. Thus, for existing sources, the MACT floor for HF is 801 μg/dscm corrected to 2 percent CO 2 . Consistent with CAA section 112(d)(3), the MACT floor for new sources cannot be less stringent th an the emissions control that is achieved in practice by the best

- controlled similar source. The 99 percent UPL calculated for both HCl and HF based on the best performing source is less stringent than the MACT floor for HCl and HF at existing furnaces. We determined that the use of th e best performing source UPL is not appropriate in this situation because the high variability and small data pool would result in a new source MACT floor limit that is less stringent than the limit based on the UPL calculated from the larger data pool for existing sources. Given that the 99 percent UPL for new sources is higher than the 99 percent for existing sources, w e determined that the MACT limit for new sources should be equal to the MACT limit for existing sources.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 86 of 225
We then considered a beyond

- the

- floor option to further reduce emissions of HCl and HF at existing sources based on application of additional add

- on control devices, such as lime injection, but their use is not indicated given the high costs of installing and operating such controls. Therefore, pursuant to CAA sections 112(d)(2) and 112(d)(3), we are proposing to revise the 1999 NESHAP to include emission limits for new and existing sources for HCl and HF of 809 μg/dscm and 801 μg/dscm, respectively. At this l evel, we do not anticipate that either source would be required to install controls to meet the limit s . 4. Formaldehyde Formaldehyde emissions are also products of incomplete combustion from the smelting operation. The existing particulate matter control d evices only achieve partial control of these volatile compounds. Pursuant to CAA section 112(d)(3), we are proposing to revise the 1999 NESHAP to include emission limits for formaldehyde. The measured average formaldehyde emissions ranged from 57 to 78 μg/ dscm corrected to 2 percent CO 2 . Because the formaldehyde emissions data included many data points reported as below the detection limit, we employed a version of the methodology used for acid gases to set the MACT floor. However, in this case we lack the underlying large data set of formaldehyde method detection limits that we had for HCl method detection limits. In this case, the first step was to define a method detection level that is representative of the data used in***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 87 of 225 defining the best performers for t he inclusive source category ( i.e. , combined data for all subcategories). We identified all of the available reported pollutant specific method detection levels and calculated the arithmetic mean value. We deemed the resulting mean of the method detection levels as the (RDL). Three times the RDL was greater than the calculated 99 percent UPL for exhaust formaldehyde concentrations from existing furnaces, resulting in a MACT floor of three times the RDL, or 201 μg/dscm at 2 percent CO 2 . Based on available da ta, all of the existing sources could meet this limit without installing additional controls. Due to the high variability in the data pool, the 99 percent UPL for the best

- performing source is less stringent than the existing source MACT floor. Therefore, pursuant to CAA section 112(d)(2) and 112(d)(3), we are proposing to revise the 1999 NESHAP to include a n emission limit for formaldehyde for new and existing sources of 201 μg/dscm based on the MACT floor calculation
. We have not identified any appropria te beyond

- the

- floor control technology options specifically for formaldehyde. We recognize the potential for some

co - control of formaldehyde emissions that would be achieved by using activated carbon injection to control mercury emissions, but we were unab le to quantify those reductions
. More information regarding how the MACT limits were calculated and the costs is provided in Ferroalloys Production MACT Floor and Cost Memos, which are available in the docket for this rulemaking
.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 88 of 225 B. What are the results of the risk assessment and analyses? As described above, for the Ferroalloys Production source category, we conducted an inhalation risk assessment for all HAP emitted. We also conducted multipathway screening analyses for mercury and POM. Details of the ris k assessment and additional analyses can be found in the residual risk documentation referenced in s ection III.B of this preamble, which is available in the docket for this action. The Agency considered the available health information

-- the MIR; the numb ers of persons in various risk ranges; cancer incidence; the maximum non

- cancer HI; the maximum
worst

- case acute non

- cancer HQ; the extent of non

- cancer risks; the potential for adverse environmental effects; and distribution of risks in the exposed popula tion (54 FR 38044, September 14, 1989)

– in developing the proposed CAA section 112(f)(2) standards for the Ferroalloys Production source category. 1. Inhalation Risk Assessment Results Table 5 of this preamble provides an overall summary of the results o f the inhalation risk assessment. Table 5. Ferroalloys Production Inhalation Risk Assessment Results

Maximum Individual Cancer Risk (in 1 million) 1 Estimated Popu

lation at increased Risk of cancer ≥ 1

- in

- 1 Million Estimated

Annual Cancer Incidence (cases per year) Maximum Chronic

Non

- cancer TOSHI 3 Maxi

mum Screen

- ing Acute Non

cancer HQ 4 Based on Actual Emissions Level 2 Based on

Allowable Emissions Level Based on Actual Emissions Level Based

on Allow

able Emis

sions Level***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 89 of 225
Manganese Facilities 80 100 26,000 0.002 90 200 10 1 Estimated maximum individual excess lifetime cancer risk due to HAP emissions from the source category. 2 B ased on the consistent views of major scientific bodies (i.e., NTP in their 12 th Report on Carcinogens, IARC, and other in ternational agencies) that consider all nickel compounds to be carcinogenic, we currently consider all nickel compounds to have the potential of being as carcinogenic as nickel subsulfide. To implement this approach we apply the nickel subsulfide IRIS URE without a factor to reflect the assumption that 100 percent of the total mass of nickel may be carcinogenic. The EPA also considers it reasonable to use a value that is 50 percent of the IRIS URE for nickel subsulfide. 3 Maximum TOSHI. The target organ wit h the highest TOSHI for the Ferroalloys Production source category is the central nervous system. 4 The maximum off

- site HQ acute value of 10 is driven by emissions of nickel. See s ection III.B of this preamble for explanation of acute dose

- response value s. The results of the chronic baseline inhalation cancer risk assessment indicate that, based on estimates of current actual emissions, the current maximum individual lifetime cancer risk posed by these two facilities could be up to 80 in one million, wit h process fugitive emission s (from the furnace, crushing operation, and casting) of nickel, chromium and arsenic as major contributors to the risk. The total estimated cancer incidence from this source category based on actual emission levels is 0.002 exce ss cancer cases per year or one case in every 500 years, with emissions of nickel, chromium and arsenic contributing 36 percent, 24 percent and 24 percent respectively, to this cancer incidence. In addition, we note that approximately 1,100 people are esti mated to have cancer risks greater than 10 in one million, and approximately 26,000 people are estimated to have risks greater than one in one million as a result of emissions from these two facilities. When considering the risks***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 90 of 225 associated with MACT

- allow able emissions, the MIR could be up to 100 in one million. The maximum modeled chronic non

- cancer TOSHI value for the source category could be up to 90 with emissions of manganese from process fugitives dominating those impacts. Approximately 28,000 people are exposed to TOSHI levels above 1. At exposure levels above a TOSHI level of 1 ( i.e. , the RfC for manganese) , manganese can cause central nervous system effects. Visual reaction time, hand steadiness, and eye

- hand coordination effects have been reported in chronically

- exposed workers. When considering MACT

- allowable emissions, the maximum chronic non

- cancer TOSHI value could be up to 200. As mentioned earlier (in s ection II), ambient concentrations of manganese were monitored at three schools located nea r one of the regulated ferroalloy production facilities during the EPA‘s School Air Toxics Initiative in late 2009. The concentrations were observed to be above the RfC for all three sites. In addition, we compared these monitored concentrations of mangane se to predicted modeled concentrations of manganese at receptors in close proximity to the monitors. At these three locations, model predictions are generally within a factor of two when compared to monitored concentrations at these sites. These results in dicate that AERMOD estimates of ambient air manganese concentrations provide a reasonable representation of the measured maximum manganese concentrations present in the ambient***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 91 of 225 air near this facility. More information about the EPA‘s School Air Toxics Init iative can be found at http://www.epa.gov/schoolair/index.html. More information about the model results and the model to monitor comparison can be found in the
R isk Assessment document , which is available in the docket. Our screening analysis for worst

- c ase acute impacts indicates the potential for two pollutants, nickel and arsenic, to exceed an HQ value of 1, with a potential maximum HQ as high as 10 for nickel and 9 for arsenic based on acute REL values for each substance. These values were based on ma ximum hourly emissions estimates and a review of the facility boundaries to make sure the estimated impacts were off facility property. Refer to Appendix 1 of the Risk Assessment document in the docket for a detailed description of how the maximum hourly e missions were developed for this source category. Based on these results, we cannot rule out the potential for acute impacts of concern from the emissions of nickel and arsenic from the two facilities in this category. 2. Multipathway Risk Assessment and R esults The PB

- HAP emitted by facilities in this category include mercury, POM (as benzo(a)pyrene toxicity equivalents, or TEQ) , and lead
. To identify potential multipathway health risks from PB

- HAP other than lead, we first performed a screening analysis t hat compared emissions of other PB

- HAP emitted from the Ferroalloys Production source category to emission threshold values. The two***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 92 of 225 facilities in the source category reported emissions of mercury and
POM , and both of them had baseline emission rates great er than the screening emission threshold values for the pollutants indicating that there may be potential multipathway impacts of concern due to emissions of these pollutants from these two facilities. One facility‘s emission rates of mercury exceeded the screening threshold by 30 times, while the other facility‘s mercury emissions exceeded the threshold by 7 times. For POM, one facility‘s emission rates exceeded the screening threshold by 600 times, while the other facility‘s emission rates exceeded the th reshold by 50 times. For mercury, exceeding the screening emission threshold value relates to a potential for creating a chronic noncancer hazard quotient in excess of 1. For POM, exceeding the screening emission threshold value relates to a potential for creating a cancer risk in excess of

one in one million. Since the two PB

- HAP did not screen out during our initial screening analysis, we refined our analysis somewhat with some additional site

- specific information to develop an ―intermediate screen.‖ (See Appendix 5 of the Risk Assessment document in the docket for more information about this intermediate screen.) The additional site

- specific information included land use around the facilities, the location of fishable lakes, and local wind direction and s peed. The result of this analysis was the development of site

specific emission screening thresholds for POM and mercury. Based on***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 93 of 225 this intermediate screening analysis, neither facility screened out, meaning that we cannot rule out the potential for multip athway impacts of concern due to emissions of these pollutants from these two facilities. One facility‘s emission rates exceeded the site

specific screening threshold for mercury by 4 times, while the other facility‘s emission rates equaled the threshold v alue. For POM, one facility‘s emission rates exceeded the site

- specific screening threshold for POM by 60 times, while the other facility‘s emission rates exceeded the threshold by 5 times. We were unable to obtain the data necessary to conduct a fully ref ined assessment of multipathway risks from these two facilities. In evaluating the potential for multipathway effects from emissions of lead, modeled maximum annual lead concentrations were compared to the National Ambient Air Quality Standards (NAAQS) for lead (0.15 μg/m 3 ). Results of this analysis estimate that the NAAQS for lead could be exceeded at one of the two facilities, largely due to process fugitive emissions. This analysis estimates that the annual lead concentrations could be as high as two tim es the NAAQS for lead, and if the maximum 3

- month rolling average concentrations were used, the result could be even greater concentrations above the NAAQS. However, this additional analysis was not conducted because, as shown below (in s ection IV. C .2), th e maximum annual lead concentration after controls is significantly below the NAAQS, with a value of 0.0 2 μg/m 3

.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 94 of 225 3. Facilitywide Risk Assessment Results For both facilities in this source category, there are no other significant HAP emissions sources prese nt beyond those included in the source category. All significant HAP sources have been included in the source category risk analysis. Therefore, we conclude that the facilitywide risk is essentially the same as the source category risk and that no separate facilitywide analysis is necessary. C. What are our proposed decisions based on risk acceptability and ample margin of safety? 1. Risk Acceptability As noted in s ection III.C of this preamble, we weigh all health risk factors in our risk acceptability de termination, including the MIR; the number of persons in various risk ranges; cancer incidence; the maximum noncancer HI; the maximum acute noncancer HQ; the extent of noncancer risks; the potential for adverse environmental effects; distribution of risks in the exposed population; and risk estimation uncertainty (54 FR 38044, September 14, 1989). Based on the baseline inhalation risk assessment, we estimate that the cancer risks to the individual most exposed could be as high as 80 in one million due to

ac tual emissions of arsenic, chromium and nickel from process fugitives and as high as 100 in one million due to MACT

- allowable emissions, mainly due to chromium and arsenic stack emissions. We estimate that the incidence of cancer based on actual emissions is 0.002 excess cancer cases per year, or 1 case every 500 years, and***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 95 of 225 that about 26,000 people face a cancer risk greater than one in one million due to HAP emissions from this source category. The chronic noncancer TOSHI could be as high as 90 due to actu al emissions of manganese from process fugitives and as high as 200 due to MACT

allowable emissions of manganese from process fugitives. We estimate that about 28,000 people face a TOSHI level greater than 1 due to emissions from this source category. With respect to potential acute non

- cancer health risks, we estimate that, based on our refined analysis, the worst

- case HQ value could exceed an HQ value of 1 for two pollutants, nickel and arsenic, with a potential maximum HQ as high as 10 for nickel and 9 f or arsenic. This indicates a potential acute concern relative to the baseline emissions of these two pollutants. Our assessment also indicated the potential for multipathway impacts of concern due to baseline emissions of mercury and POM. The risk assessm ent for this source category was based on facility

- specific stack

- test data and emissions estimates, giving us a generally high degree of confidence in the results. Considering all of the above information, we conclude that the current risks associated wit h MACT

- allowable emissions from this source category are unacceptable, primarily due to manganese, chromium and arsenic emissions from stacks. We also conclude that the current chronic noncancer risks based on actual emissions are unacceptable, primarily d ue to manganese emissions from process fugitives.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 96 of 225 2. Proposed controls to address unacceptable risks We conducted an assessment to estimate the risks from the two facilities in the source category based on a post

- control scenario reflecting the proposed requirements described above to address unregulated HAP (section IV.A) and the proposed controls described below . Details are provided in the Draft Risk Assessment report which is available in the docket for this action. a. Allowable stack emissions
. In o rder to ensure that the risks associated with this source category are acceptable, we evaluated the potential to reduce MACT

allowable stack emissions, which had driven the cancer MIR based on allowable emissions to 100 in a million, primarily due to allow able stack emissions of arsenic and chromium , and contributed significantly to the chronic noncancer TOSHI (based on allowable emissions) of 200, primarily due to allowable stack emissions of
manganese . Our analysis determined that we could lower the exist ing particulate matter emission limit s by approximately 50 percent for furnace stack emissions, by 80 percent for crushing and screening stack emissions and by 98 percent for the metal oxygen refining process, to develop limits that are achievable with exi sting control s . After the implementation of these tighter PM limits, the cancer MIR for the source category would become 80 in one million and the TOSHI would be about 90
.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 97 of 225
F or the reasons described above , under the authority of CAA section 112(f)(2), we p ropose to set particulate matter emission limits for the stacks at levels indicative of current performance ( i.e. , based on a MACT floor UPL analysis) as discussed in section
IV.D .1 (technology review section). These new allowable emissions levels will red uce potential risks due to allowable emissions from the stacks and prevent backsliding. We propose that c ompliance for existing sources will be demonstrated by annual stack testing and installation and operation of bag leak detection systems for both new

a nd existing sources. b. Process fugitive emissions sources
. Process fugitive sources are partially controlled by the existing MACT via a shop building opacity standard; however, that standard was only intended to address tapping process fugitives generate d under ―normal‖ tapping process operating conditions. Casting and crushing and screening process fugitives in the furnace building were not included. Under the authority of section 112(d)(2) of the Act, which allows the use of measures to enclose systems or processes to eliminate emissions and measures to collect, capture or treat such pollutants when released from a process, stack, storage, or fugitive emissions point, we evaluated several options to achieve improved emissions capture. We developed severa l control scenarios to

assess options to improve/add local ventilation and associated control, but we concluded that these were all ineffective in***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 98 of 225 significantly reducing risk. As part of the technology review process, we identified a furnace building venti lation system at a

non - manganese producer of ferroalloys. W e evaluated an option based on this furnace building ventilation system, which involves enclosing the furnace building(s) and evacuat ing the emissions to a control device(s)
. Based on our assessmen t we conclude that this option w ould reduce risks to acceptable levels. Therefore, under the authority of CAA section 112(f), we are proposing such an approach, whereby fugitive emissions at the ridge vents of the shop building would need to be collected u nder negative pressure and ducted to a control device
. We are proposing that the PM emissions limit at the control device would be the same as it is for the furnace stacks ( 24
mg /dscm ) . This would allow sources the option to duct some or all process fugit ive emissions to an existing furnace control device if it has excess capacity. If the existing control device at the facility do es not have sufficient excess capacity to handle the captured emissions, the facility would have to install additional controls capable of complying with the proposed emission limit. The source would also have to monitor building opacity, prepare and operate according to a process fugitives ventilation plan and conduct annual performance testing of the building ventilation control device to demonstrate compliance with the proposed standards. Baghouses would be required to be equipped with BLDS.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 99 of 225 However, w e acknowledge that there may be other control measures and alternative approaches that we have not identified that are effective i n reducing process fugitive emissions from the furnace building. Therefore, as an alternative to the requirement to enclose the furnace building(s) and evacuate the emissions to a control device(s), we are proposing a fenceline action level that would serv e as a trigger for corrective action should such level be exceeded. This monitoring alternative is designed to allow for flexibility and prevent redundant requirements. Specifically, we propose to require that sources seeking to use this alternative prepar e and submit for the Administrator‘s approval a written plan describing and explaining a proposed compliance monitoring network to consist of at least two monitors and procedures for sampling, sample handling and custody, sample analysis, quality

assurance , and recordkeeping procedures. The purpose of the ambient air monitoring network would be to ensure that manganese concentrations in air near the facility boundaries remain at or below 0.1 μg/m 3 based on 10

- sample rolling averages, with samples being coll ected every 6 days. The monitoring plan must include a minimum of two monitoring sites that are placed in locations that are most likely to capture measurements of the maximum concentrations at or near the facility boundaries. For example, at least one mon itor must be placed in the predominant downwind direction from main emissions sources based on historical weather patterns in the area. This***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 100 of 225 alternative regulatory requirement would provide flexibility to facilities in determining the within

- facility sourc es that should be vented to a control device that are most effective for reducing process fugitive emissions at their facilities. Nevertheless, we are seeking comments on this proposed alternative requirement, including whether two monitors would be suffic ient or if more monitors may be warranted. We propose that if the 10

- sample rolling averages exceed the specified concentration then corrective actions must be implemented
. Upon the first exceedance of a 10

- sample rolling average, the source would be requi red within 6 months to evaluate the capture and control of process fugitives from the furnace building , evaluate other potential sources of fugitive emissions, and then implement any changes indicated to reduce fugitives to levels that would result in air concentrations below 0.1 μg/m 3 based on 10

- sample rolling averages. Upon a subsequent exceedance of the 10

- sample rolling average following the 6

- month evaluation and implementation period, the source would be required to comply with the requirement to

enc lose the furnace building(s) and evacuate the emissions to a control device(s). In this case, the source would be required to complete the enclosure within 1 year from the time the subsequent exceedance occurs. In order to avoid delays in complying with pr ocess fugitives standards, we propose to require that the written plan be submitted***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 101 of 225 within 45 days of the effective date of the final rule so that all necessary planning, equipment acquisition, and system development can take place before the 2

- year compli ance date. In this way, if the source determines that the use of such system is unlikely to be an effective alternative to the building enclosure option, the source would be able to comply with the primary option by the compliance date of the final rule
. W e propose to set the fenceline concentration action level to reflect the comparable level of risk that is estimated to remain after compliance with the requirement to enclose the furnace building(s) and evacuate the emissions to a control device(s). As des cribed in section IV.D.2, the maximum chronic noncancer inhalation TOSHI value would be 2, because the post

- control modeling indicates the maximum ambient concentration of manganese would be twice the current value of the RfC for manganese. Therefore, a va lue twice this concentration, 0.1 μg/m 3 , is proposed as the fenceline action level. We request comment on whether the action level should instead be based on the actual RfC of 0.05 μg/m 3 to ensure that variations in ambient concentrations of manganese over the course of the 10

- sample period will remain at acceptable levels. We note that the RfC is not designed to be a regulatory limit, and it is defined as ― An estimate (with uncertainty spanning perhaps an order of magnitude) of a continuous inhalation expo sure to the human population (including sensitive subgroups) that is likely to be without an appreciable risk***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 102 of 225 of deleterious effects during a lifetime. It can be derived from a NOAEL, LOAEL, or benchmark concentration, with uncertainty factors generally ap plied to reflect limitations of the data used.‖ 31
Therefore , we request comment on other concentration values that might be appropriate to serve as the action level for fenceline monitoring under this alternative. The proposed averaging period is consisten t with the School Air Toxics Initiative ambient air monitoring program, but we request comment on whether a different averaging period should be required. As part of this alternative, we are also proposing a provision that would allow for reduced monitorin g if the facility demonstrates ambient manganese concentrations less than 50 percent of the ambient manganese concentration limit for 3 consecutive years at each monitor. We propose that a revised monitoring plan may be submitted (for review and possible a pproval by the Administrator) to reduce the sampling and analysis frequency if all of the 10

- sample rolling average concentrations at each monitor are less than 50 percent of the limit of 0.1 μg/m 3 over a 3

- year perio d. All of t hese proposed controls are d escribed further under the technology review (in s ection IV.D.2.) of this preamble. c. Results of the post

- control risk assessment
. The results of the post

- control chronic inhalation cancer risk assessment indicate that , based on actual emissions, the maxi mum

31 IRIS Gl ossary. http://www.epa.gov/iris/help_gloss.htm***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 103 of 225 individual lifetime cancer risk posed by these two facilities, after the implementation of the proposed controls, could be up to 5 in one million, reduced from 80 in one million (i.e., pre

- controls), with an estimated reduction in cancer incidence to 0 .0004 excess cancer cases per year, reduced from 0.002 excess cancer cases per year. In addition, the number of people estimated to have a cancer risk greater than or equal to one in one million would be reduced from 26,000 to 1,300. The results of the pos t

- control assessment also indicate that , based on actual emissions, the maximum chronic noncancer inhalation TOSHI value would be reduced to 2, from the baseline estimate of 90. The number of people estimated to have a TOSHI greater than 1 would be reduced from 28,000 to less than 10. We also estimate that after the implementation of controls, the maximum worst

- case acute refined HQ value would be reduced from a potential high of 10 to 0. 3 (based on the REL value for nickel compounds) eliminating any potent ial for acute impacts of concern. Considering post

- control emissions of multipathway HAP, mercury emissions would be reduced approximately 88 percent, while POM emissions would be reduced approximately 66 percent from the baseline emission rates. Based on our intermediate screening approach for multipathway risks, emissions of mercury ―screen out,‖ or are reduced below the screening threshold for both facilities, indicating no potential for multipathway impacts of concern due to mercury.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 104 of 225 However, emissions of POM (as benzo(a)pyrene TEQ) remain above the intermediate screening thresholds for both facilities (one by a factor of 20 and one by a factor of 2), indicating that we cannot rule out the potential for multipathway impacts of concern due to emissions o f POM from these facilities. As mentioned above, the highest lead concentration after controls, 0.02 μg/m 3 , is well below the NAAQS, indicating a low potential for multipathway impacts of concern due to lead. 3. Ample margin of safety analysis and proposed controls Under the ample margin of safety analysis, we evaluate the cost and feasibility of available control technologies and other measures (including the controls, measures and costs reviewed under the technology review) that could be applied in this s ource category to further reduce the risks due to emissions of HAP identified in our risk assessment. We estimate that the actions proposed under CAA section 112(f)(2), as described above to address unacceptable risks , will reduce the MIR associated with a rsenic, nickel and chromium from 80 in one million to 5 in one million for actual emissions. The cancer incidence will be reduced from 0.002 to 0.0004, and the number of people estimated to have cancer risks greater than one in one million will be reduced, from 26,000 people to 1,300 people. T he chronic noncancer inhalation TOSHI will be reduced from 90 to 2, and the number of people exposed to a TOSHI level greater than 1 will be***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 105 of 225 reduced from 28,000 people to less than 10 people. In addition, the maximum a cute HQ value will be reduced from potentially up to 10 to less than 1, and the potential multipathway impacts will be reduced. Based on all of the above information, we conclude that the risks after implementation of the proposed controls are acceptable. Based on our research and analysis, we did not identify any cost

effective controls beyond those proposed above. As a result, we conclude that the implementation of this proposed rule will provide public health protection with an ample margin of safety.
Ne vertheless, we are soliciting comments and information regarding additional process fugitive control measures, work practices that may be available and their feasibility to further reduc e process fugitive emissions of metal HAP, or additional monitoring th at may be warranted to ensure adequate control of process fugitive emissions. D. What are the results and proposed decisions based on our technology review? Based on our technology review, we determined that there have been advances in emissions control me asures since the Ferroalloys Production NESHAP was originally promulgated in 1999. Since promulgation, facilities have steadily improved the performance of their control devices through upgrades or replacements. They have also developed improved capture te chniques for some process fugitives ( e.g. , casting and tapping emissions). Additional details regarding***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 106 of 225 these analyses can be found in the following technical document for this action which is available in the docket: Draft Technology Review for the Ferroa lloys Production Source Category
. 1. Metal HAP emissions from stacks We propose to continue to use particulate matter as a surrogate for metal HAP other than mercury. For a discussion regarding the appropriateness of particulate matter as a surrogate for n on - mercury metal HAP, please see the metal HAP surrogacy memo in the docket for this proposed rule. Based on the results from the ICR test program, we determined that all of the sources of stack emissions are emitting at significantly lower levels than the ir maximum permitted levels
. For this reason, under the authority of CAA section 112(d)(6), we are proposing revised emission limits for new and existing sources. We are also proposing that any uncontrolled furnace vent stacks would be subject to the same concentration limits. We calculated the proposed emission limits based on a MACT floor
UPL analysis , resulting in a proposed existing source furnace stack emissions limit of 24 mg /dscm and proposed new source furnace stack emissions limit of 9 .3 mg/dscm. We also calculated a proposed stack emission limit of 13 mg/dscm for crushing and screening equipment that would apply to both new and existing sources. The metal oxygen refining operation is a unique process, and so we only have a single ICR test data po int. Therefore, we calculated a proposed emissions limit for this source using the 99 percent UPL***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 107 of 225
f rom the test data, resulting in a proposed limit of 1.5 mg/dscm that would apply to new and existing metal oxygen refining operation

sources. Based on our a nalyses, we expect that no additional controls would be required for the facilities to comply with these proposed limits. We propose that s ources would be required to conduct periodic performance testing, and develop and operate according to a baghouse
ope rating plan or continuously monitor scrubber operating parameters. Furnace baghouses would be required to be equipped with bag leak detection systems (BLDS). 2. Metal HAP emissions from process fugitives As described above, we evaluated several options to improve and increase the capture and control of process fugitive sources. The two main options involve either local ventilation or building ventilation. Local ventilation is common in this industry, but performance varies due to design of the capture syste m, maintenance practices and control device capacity. Industry representatives have expressed concern that extensive retrofitting of local ventilation is complicated at existing facilities because of the need for material movement using large overhead cran es and ladles. We identified a furnace building ventilation system at a ferrosilicon producer, using a similar production process. This ―system‖ is basically an enclosure of the furnace building with evacuation of emission to a control device.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 108 of 225 We evaluated an option to enclose the furnace building(s) and evacuate the emissions to a control device(s) similar to the system used at the ferrosilicon producing facility described above . Based on that evaluation, we believe that it is feasible to install enclosure s and have the fugitive emissions at the ridge vents of the shop building collected under negative pressure and ducted to a control device , and have a PM emissions limit at the control device the same as it is for the furnace stacks ( i.e ., 24 mg /dscm). Thi s would allow sources the option to duct some or all process fugitive emissions to an existing furnace control device if it has excess capacity. If it does not have excess capacity, the facility would have to install additional controls. Under this option, t he source would also have to monitor building opacity; prepare and operate according to a process fugitives emissions ventilation plan, which would include requirements to demonstrate that the building is being operated at a negative pressure of at least 0.007 inches of water; and conduct periodic performance testing of the building ventilation control device to demonstrate compliance with the proposed standards. Baghouses would be required to be equipped with BLDS. We estimate the total capital costs of installing the required ductwork, fans, and baghouses under this option to be $9.5 million and the total annualized costs to be $2.3 million for the two plants. We estimate that metal HAP emission s would be reduc ed by 81 tons, resulting in a cost per ton o f HAP removed at $28,000 per ton ($14***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 109 of 225 per pound). We also estimate that this option would achieve PM emission reduction s of 630 tons, resulting in a cost per ton of PM removed at $3,600 per ton and achieve PM 2.5 emission reductions of 315 tons, resulting i n a cost per ton of PM 2.5 removed of $7,200 per ton. In light of the technical feasibility and cost effectiveness of this approach, we are proposing this option under the authority of section 112(d)(6). These proposed requirements are exactly the same as t hose proposed under Section 112(f) which are described in s ection IV.C.2 of this preamble. We acknowledge that there may be other control measures and alternative approaches that we have not identified that are effective in reducing process fugitive emissi ons from the furnace building. Therefore, as an alternative to the requirement to enclose the furnace building(s) and evacuate the emissions to a control device(s), we are proposing a fenceline action level that would serve as a trigger for corrective acti on should such level be exceeded. This monitoring alternative is designed to allow for flexibility and prevent redundant requirements. Specifically, we propose to require that sources seeking to use this alternative prepare and submit for the Administrator ‘s approval a written plan describing and explaining a proposed compliance monitoring network to consist of at least two monitors and procedures for sampling, sample handling and custody, sample analysis, quality

assurance, and recordkeeping procedures. Th e purpose of the ambient***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 110 of 225 air monitoring network would be to ensure that manganese concentrations in air near the facility boundaries remain at or below 0.1 μg/m 3 based on 10

- sample rolling averages, with samples being collected every 6 days. The monitoring plan must include a minimum of two monitoring sites that are placed in locations that are most likely to capture measurements of the maximum concentrations at or near the facility boundaries. For example, at least one monitor must be placed in the predomi nant downwind direction from main emissions sources based on historical weather patterns in the area. This alternative regulatory requirement would provide flexibility to facilities in determining the within

- facility sources that should be vented to a cont rol device that are most effective for reducing process fugitive emissions at their facilities. Nevertheless, we are seeking comments on this proposed alternative requirement, including whether two monitors would be sufficient or if more monitors may be

wa rranted. We propose that if the 10

- sample rolling averages exceed the specified concentration then corrective actions must be implemented
. Upon the first exceedance of a 10

- sample rolling average, the source would be required within 6 months to evaluate th e capture and control of process fugitives from the furnace building , and evaluate other potential sources of fugitive emissions, and then implement any changes indicated to reduce fugitive emission s to levels that would result in air levels below 0.1 μg/ m 3 based on 10

- sample rolling***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 111 of 225
averages . Upon a next exceedance of the 10

- sample rolling average following the 6

- month implementation period, the source would be required to comply with the requirement to enclose the furnace building(s) and evacuate the emi ssions to a control device(s). In this case, the source would be required to complete the enclosure within 1 year from the time the next exceedance occurs. In order to avoid delays in complying with process fugitives standards, we propose to require that t he written plan be submitted within 45 days of the effective date of the final rule so that all necessary planning, equipment acquisition and system development can take place before the 2

- year compliance date. In this way, if the source determines that th e use of such system is unlikely to be an effective alternative to the building enclosure option, the source would be able to comply with the primary option by the compliance date of the proposed standards. We propose to base the fenceline concentration ac tion level to reflect the comparable level of risk that is estimated to remain after compliance with the requirement to enclose the furnace building(s) and evacuate the emissions to a control device(s). As described in section IV.D.2, the maximum chronic n oncancer inhalation TOSHI value would be 2, because the post

- control modeling indicates the maximum ambient concentration of manganese would be twice the current value of the RfC for manganese. Therefore, a value twice this concentration, 0.1 μg/m 3 , is pro posed as the fenceline action level.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 112 of 225 We request comment on whether the action level should instead be based on the actual RfC of 0.05 μg/m 3 to ensure that variations in manganese emissions over a 10

- sample period will remain at acceptable levels. We note t hat the RfC is not designed to be a regulatory limit, and it is defined as ― An estimate (with uncertainty spanning perhaps an order of magnitude) of a continuous inhalation exposure to the human population (including sensitive subgroups) that is likely
to be without an appreciable risk of deleterious effects during a lifetime. It can be derived from a NOAEL, LOAEL, or benchmark concentration, with uncertainty factors generally applied to reflect limitations of the data used.‖ 32 Therefore , we request comment on other concentration values that might be appropriate to monitor under this fenceline alternative. The proposed averaging period is consistent with the School Air Toxics Initiative ambient air monitoring program, but we request comment on whether a diff erent averaging period should be required. As part of this alternative, we are also proposing a provision that would allow for reduced monitoring if the facility demonstrates ambient manganese concentrations less than 50 percent of the ambient
manganese co ncentration limit for 3 consecutive years at each monitor. We propose that a revised monitoring plan may be submitted (for review and possible approval by the Administrator) to reduce the sampling and analysis frequency if all of the 10

- sample rolling

32 IRIS Glossary. http://www.epa.gov/iris/help_gloss.htm

.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 113 of 225

aver age concentrations at each monitor are less than 50 percent of the limit of 0.1 μg/m 3 over a 3

- year period. 3. Hydrochloric acid, hydrofluoric acid and formaldehyde emissions from furnace stacks No facilities in the source category use add

- on control devi ces or work practices to limit emissions of these pollutants beyond what is normally achieved as co

- control of the emissions with particulate matter control device. There are available add

- on control devices, such as lime injection, but their use is not in dicated given the costs of installing and operating such controls and a concern that use of this control technology could prevent the current practice of reusing o r selling baghouse dust and the resulting waste reduction benefits
. See the Draft MACT Floor Analysis for the Ferroalloys Production Source Category in the docket for more discussion of this topic. For this reason, we are not proposing any additional requirements for HCl, FH, or formaldehyde under CAA section 112(d)(6). 4. Mercury emissions from f urnace stacks As described in s ection IV.A of today‘s preamble, we are proposing MACT limits for mercury based a beyond the floor analysis. In this section we provide further discussion of the review of the relevant technologies.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 114 of 225 No facilities in the sour ce category use add

- on control devices or use work practices to limit emissions of mercury emissions beyond what is normally achieved as co

- control of the emissions with the particulate matter control device. We found that the bulk of mercury emissions are emitted from the furnace control devices as measured during the ICR test program. Because of the magnitude of mercury emissions (estimated to be 540 pounds per year (lb/yr) at one plant and 140 lb/yr at the other plant), we evaluated potential add

- on cont rol in the form of activated carbon injection. The use of activated carbon injection is being considered in other recent NESHAP such as the Utility MACT NESHAP and the Portland Cement NESHAP, and mercury reductions of up to 90 percent should be achievable at ferroalloys production facilities. Based on our experience with mercury controls for other combustion sources such as boilers, w e conclude that activated carbon injection is a viable control technology in the Ferroalloys Production source category, but we request comment on other possible controls that could be effective and perhaps less costly. We recognize the potential concern that use of these controls upstream of the particulate matter control device may pose issues with fabric filter dust contamin ation or sludge contamination and may result in some waste products being classified as Resource Conservation and Recovery Act (RCRA) waste versus the more easily and less costly to dispose of industrial waste. In addition, some companies re

- use or sell th eir baghouse dust***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 115 of 225 (primarily for use in cement kilns). There is concern that even if the material meets quality standards, that re

- introduction of the dust into a furnace or kiln would cause the mercury to become unbound from the carbon and be emitted into the atmosphere. We reviewed facility specific control options that included putting the mercury controls downstream of the existing furnace baghouse to avoid the potential issues associated with upstream controls. Under this scenario, t he activated carbo n injection system would be followed by a ―polishing‖ baghouse to capture the activated carbon for disposal. In the case of the existing furnace scrubber, we assumed the source could put the activated carbon injection system upstream of the scrubber, the c arbon would be captured by the scrubber and the resulting sludge treated according to the existing treatment process at the plant. Based on discussion with vendors and other control technology experts, we do not believe that the resulting carbon waste in e ither scenario would trigger the RCRA compliance concerns raised by the companies . This is because once the mercury absorbs to the activated carbon, it will stay there until heated above 400 degrees Fahrenheit. The captured activated carbon should pass the Toxicity Characteristic Leaching Procedure test, which is an EPA test method used to characterize waste as either hazardous or non

- hazardous for the purpose of disposal. Therefore, the captured activated carbon would unlikely be considered hazardous
waste and can be disposed of in a landfill.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 116 of 225 It would be technically feasible to install controls at the remaining source to achieve even further reductions. However these reductions would be based on a much lower level of emissions and require installing the a ctivated carbon injection systems upstream of three positive pressure baghouses, which would mean that they would not be able to reuse or sell any of their baghouse dust. We do not consider this to be a viable option at this time. The option that we are pr oposing under section 112(d)(3), which is described in section IV.A. of this preamble, requires an estimated $1.7 million in capital costs, $1.4 million in annualized costs, with cost effectiveness of $3,300 per pound of mercury reduction. We believe this option reflects feasible and cost

- effective controls. For this reason, under the authority of CAA section 112(d)(6), we are also proposing to establish emission limits for mercury emissions at the beyond the floor level of 16 μg/dscm at 2 percent CO 2 , whic h is the exact same standard that we are proposing under section 112(d)(2) and 112(d)(3) of the CAA, as described in s ection IV.A. of today‘s preamble. Both sources would be subject to periodic performance testing and periodic sampling of the manganese or e for variations in mercury content. Should the resulting weighted average mercury content increase significantly, the source would be required to retest in order to demonstrate continuing compliance.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 117 of 225 For this proposal, we propose that the determination o f a significant increase in mercury content would be that the rolling weighted average mercury concentration in the manganese ore increase s by 10 percent or more compared to the baseline weighted average mercury concentration. If that limit is exceeded, th e source would be required to readjust the carbon injection rate as specified in the source‘s monitoring plan or retest within 30 days if there is not a dedicated mercury control device. If a new ore is added, sampling would be required as well. We are in terested in any data that would show the variability in mercury concentration between different ore samples from the same location and the variability of the types of ores used in manganese production. If ore type and mercury content are demonstrated to be stable, we might consider whether to reduce the frequency of sampling/calculations to quarterly or less. Finally, any source installing activated carbon injection would be required to continuously monitor the carbon injection rate into the airstream bein g controlled. W e request comment on the level of variability in the carbon injection rate that should be allowed, and what percent de crease in the rate should be considered significant. 5. Polycyclic aromatic hydrocarbons from the furnace stack Like mercu ry, no existing facilities in the source category control PAH or use work practices to limit emissions of PAH emissions beyond what is normally achieved by modest co

- control of the***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 118 of 225 emissions with the particulate matter control device. Under today‘s
proposa l, t hese pollutants would be controlled with the same activated carbon injection technology as mercury. Because of this, emission reductions could be achieved via co

- control at no additional
costs. As described in section IV.A. of this preamble, t he MACT floor for POM is based on an UPL that we believe both facilities can meet with existing controls . Using the data from the higher emitting facility, we calculated a beyond the floor emissions level based on a 90 percent reduction of the 99 percent UPL for P AH from this plant. The resulting limit is 89 μg/dscm. With a limit of 89 μg/dscm we estimate that the lower emitting facility would be able to meet this limit with no additional controls. We estimate that the higher emitting facility will be able to achie ve this limit using activated carbon injection, which is the same controls we expect they would use to meet the mercury limit. Therefore, there would be no additional control costs to meet the limit for PAHs. As described in s ection IV.A. of this preamble, we are proposing this limit of 89 μg/dscm for PAHs under section 112(d)(3) of the CAA. We are also proposing the exact same limit under s ection 112(d)(6) of the CAA since it reflects feasible and cost

- effective control technologies. 6. Outdoor fugitive du st emissions The existing rule has a requirement for an outdoor fugitive dust control plan. We are unable to quantify HAP emissions from outdoor***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 119 of 225 fugitive dust sources and did not identify any additional procedures or controls that could be expected to have a significant impact on these emissions. Therefore, we are not proposing to change the existing requirements.
E . What other actions are we proposing? 1. Startup, Shutdown, Malfunction The United States Court of Appeals for the District of Columbia Circui t vacated portions of two provisions in the EPA‘s CAA section 112 regulations governing the emissions of HAP during periods of SSM. Sierra Club v. EPA , 551 F.3d 1019 (D.C. Cir. 2008), cert. denied , 130 S. Ct. 1735 (U.S. 2010) . Specifically, the Court vacat ed the SSM exemption contained in 40 CFR 63.6(f)(1) and 40 CFR 63.6(h)(1), that are part of a regulation, commonly referred to as the ―General Provisions Rule,‖ that the EPA promulgated under CAA section 112. When incorporated into CAA section 112(d) regul ations for specific source categories, these two provisions exempt sources from the requirement to comply with the otherwise applicable CAA section 112(d) emissions standard during periods of SSM. We are proposing the elimination of the SSM exemption in th is rule. Consistent with Sierra Club v. EPA , the EPA is proposing standards in this rule that apply at all times. We are also proposing several revisions to Table 1 to subpart XXX of p art 63 (the General Provisions Applicability table). For example, we are proposing to eliminate the incorporation of the General Provisions‘ requirement***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 120 of 225 that the source develop an SSM plan. We also are proposing to eliminate or revise certain recordkeeping and reporting that related to the SSM exemption. The EPA has attempted to ensure that we have not included in the proposed regulatory language any provisions that are inappropriate, unnecessary, or redundant in the absence of the SSM exemption. We are specifically seeking comment on whether there are any such provisions that we have inadvertently incorporated or overlooked. In proposing the standards in this rule, the EPA has taken into account startup and shutdown periods and, for the reasons explained below, has not proposed different standards for those periods. Informatio n on periods of startup and shutdown received from the industry in the ICR indicate that emissions during these periods do not increase. Control devices such as baghouses for metal HAP particulate control and activated carbon controls for mercury are start ed up before the process units, and are operational during the shutdown phase of a process. Therefore, no increase in emissions is expected during these periods. Building ventilation systems for
process fugitive emissions will be in place at all times. The refore, separate standards for periods of startup and shutdown are not being proposed. Periods of startup, normal operations, and shutdown are all predictable and routine aspects of a source‘s operations. However, by contrast, malfunction is defined as a ―sudden, infrequent, and not***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 121 of 225 reasonably preventable failure of air pollution control and monitoring equipment, process equipment or a process to operate in a normal or usual manner * * * ‖ (40 CFR 63.2). The EPA has determined that CAA section 112 does not require that emissions that occur during periods of malfunction be factored into development of CAA section 1 12 standards
. Under CAA section 112, emissions standards for new sources must be no less stringent than the level ―achieved‖ by the best controlled similar source , and emission standards for existing sources generally must be no less stringent than the average emissions limitation ―achieved‖ by the best performing 12 percent (or 5 sources in cases where there are fewer than 30 sources in the

source c ategory) of sources in the category
. There is nothing in CAA section 112 that directs the Agency to consider malfunctions in determining the level ―achieved‖ by the best performing or best controlled sources when setting emissions standards. Moreover, whil e the EPA accounts for variability in setting emissions standards consistent with the CAA section 112 case law, nothing in that case law requires the Agency to consider malfunctions as part of that analysis. Section 112 of the CAA uses the concept of ―best controlled‖ and ―best performing‖ unit in defining the level of stringency that CAA section 112 performance standards must meet. Applying the concept of ―best controlled‖ or ―best performing‖ to a unit that is malfunctioning presents significant difficult ies, as malfunctions are sudden and unexpected events.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 122 of 225 Further, accounting for malfunctions would be difficult, if not impossible, given the myriad different types of malfunctions that can occur across all sources in the category and given the difficultie s associated with predicting or accounting for the frequency, degree, and duration of various malfunctions that might occur. As such, the performance of units that are malfunctioning is not ―reasonably‖
foreseeable. See, e.g. , Sierra Club v
. EPA , 167 F. 3d 658, 662 (D.C. Cir. 1999) ( The EPA typically has wide latitude in determining the extent of data

- gathering necessary to solve a problem. We generally defer to an agency's decision to proceed on the basis of imperfect scientific information, rather than to "invest the resources to conduct the perfect study." ) See also , Weyerhaeuser v
. Costle , 590 F.2d 1011, 1058 (D.C. Cir. 1978) (―In the nature of things, no general limit, individual permit, or even any upset provision can anticipate all upset situations. A fter a certain point, the transgression of regulatory limits caused by  ̳uncontrollable acts of third parties,‘ such as strikes, sabotage, operator intoxication or insanity, and a variety of other eventualities, must be a matter for the administrative exerc ise of case

- by

- case enforcement discretion, not for specification in advance by regulation‖). In addition, the goal of a best controlled or best performing source is to operate in such a way as to avoid malfunctions of the source and accounting for malfunc tions could lead to standards that are significantly less stringent than levels that are achieved by a well

- performing non

-***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 123 of 225 malfunctioning source. The EPA‘s approach to malfunctions is consistent with CAA section 112 and is a reasonable interpretation of th e statute. In the event that a source fails to comply with the applicable CAA section 112(d) standards as a result of a malfunction event, the EPA would determine an appropriate response based on, among other things, the good faith efforts of the source t o minimize emissions during malfunction periods, including preventative and corrective actions, as well as root cause analyses to ascertain and rectify excess emissions. The EPA would also consider whether the source's failure to comply with the CAA sectio n 112(d) standard was, in fact, ―sudden, infrequent, not reasonably preventable‖ and was not instead ―caused in part by poor maintenance or careless operation‖ 40 CFR 63.2 (definition of malfunction). Finally, the EPA recognizes that even equipment that is properly designed and maintained can sometimes fail and that such failure can sometimes cause an exceedance of the relevant emissions standard. ( See, e.g. , State Implementation Plans: Policy Regarding Excessive Emissions During Malfunctions, Startup, and Shutdown (Sept. 20, 1999); Policy on Excess Emissions During Startup, Shutdown, Maintenance, and Malfunctions (Feb. 15, 1983)). The EPA is therefore proposing to add to the final rule an affirmative defense to civil penalties for exceedances of emissions l imits that are caused by malfunctions. See 40 CFR 63. 16 2 2 (defining ―affirmative defense‖ to***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 124 of 225 mean, in the context of an enforcement proceeding, a response or defense put forward by a defendant, regarding which the defendant has the burden of proof, and the merits of which are independently and objectively evaluated in a judicial or administrative proceeding). We also are proposing other regulatory provisions to specify the elements that are necessary to establish this affirmative defense; the source must pr ove by a preponderance of the evidence that it has met all of the elements set forth in 40 CFR 63. 16 2 7 (40 CFR 22.24). The criteria ensure that the affirmative defense is available only where the event that causes an exceedance of the emissions limit
meets the narrow definition of malfunction in 40 CFR 63.2 (sudden, infrequent, not reasonable preventable and not caused by poor maintenance and or careless operation). For example, to successfully assert the affirmative defense, the source must prove by a
prep onderance of the evidence that excess emissions ―[w] ere caused by a sudden, infrequent, and unavoidable failure of air pollution control and monitoring equipment, process equipment, or a process to operate in a normal or usual manner ....‖ The criteria also a re designed to ensure that steps are taken to correct the malfunction, to minimize emissions in accordance with 40 CFR 63. 16 2 3(g) and to prevent future malfunctions. For example, the source must prove by a preponderance of the evidence that ―[r] epairs were made as expeditiously as possible when the applicable emissions limitations were being exceeded ...‖ and that ―[a] ll possible steps were taken to***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 125 of 225 minimize the impact of the excess emissions on ambient air quality, the environment and human health ....‖ In any j udicial or administrative proceeding, the Administrator may challenge the assertion of the affirmative defense and, if the respondent has not met its burden of proving all of the requirements in the affirmative defense, appropriate penalties may be assesse d in accordance with CAA s ection 113 (see also 40 CFR 22.77). Specifically, we are proposing the following changes to the rule. Added general duty requirements in 40 CFR 63. 16 2 3 ( g ) to replace General Provision requirements that reference vacated SSM provi sions. Added replacement language that eliminates the reference to SSM exemptions applicable to performance tests in 40 CFR 63. 16 2 5 ( a ) (5)
. Added paragraphs in 40 CFR 63. 16 2 9 ( d ) requiring the reporting of malfunctions as part of the affirmative defense pro visions. Added paragraphs in 40 CFR 63. 16 2 9 ( b ) requiring the keeping of certain records during malfunctions as part of the affirmative defense provisions. Developed Table 1 to subpart XX X of part 63 to reflect changes in the applicability of the General Pr ovisions to this subpart resulting from a court vacatur of certain SSM requirements in the General Provisions.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 126 of 225 2
. Electronic reporting The EPA and other authorities such as state, local and tribal agencies must have performance test data to conduct effect ive reviews of CAA sections 112 and 129 standards, as well as for many other purposes including compliance determinations, emission factor development, and annual emission rate determinations. We believe that improvements in the process of submitting, revi ewing and storing test data would result in increases in efficiency and cost savings to the regulated community; state, local and tribal agencies; the public and ourselves. These improvements are possible because stack testing firms are increasingly collec ting performance test data in electronic format, making it possible to move to an electronic data submittal system that would increase the ease and efficiency of data submittal and improve data accessibility. Through this proposal , the EPA is pr oposing a s tep to increase the ease and efficiency of data submittal and improve data accessibility
. Specifically, the EPA is proposing that o wners and operators of Ferroalloys Production facilities submit electronic copies of required performance test reports to the EPA‘s WebFIRE database. The WebFIRE database wa s constructed to store performance test data for use in developing emission factors. A description of the WebFIRE database is available at h ttp://cfpub.epa.gov/oarweb/index.cfm?action=fire.main

.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 127 of 225 As proposed above, d ata entry would be through an electronic emissions test report structure called the Electronic Reporting Tool (ERT)
. The ERT would be able to transmit the electronic report through the EPA‘s Central Data Exchange network for storage in the WebFIRE database , making submittal of data very straightforward and easy. A description of the ERT can be found at http://www.epa.gov/ttn/chief/ert/index.html

. The proposal to submit performance test data electronically to the EPA would apply only to those perform ance tests conducted using test methods that will be supported by the ERT. The ERT contains a specific electronic data entry form for most of the commonly used the EPA reference methods. A listing of the pollutants and test methods supported by the ERT is available at http://www.epa.gov/ttn/chief/ert/index.html

. W e believe that industry would benefit from this proposed approach to electronic data submittal. Having these data, the EPA would be able to develop improved emission factors, make fewer information requests, and promulgate better regulation s . One major advantage of the proposed submittal of performance test data through the ERT is a standardized method to compile and store much of the documentation required to be reported by this rule
. Another adva ntage is that the ERT clearly states what testing information would be required. Another important proposed benefit of submitting these data to the EPA at the time the source test is***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 128 of 225 conducted is that it should substantially reduce the effort involved in d ata collection activities in th e future. When the EPA has performance test data in hand, there will likely be fewer or less substantial data collection requests in conjunction with prospective required residual risk assessments or technology reviews. This would result in a reduced burden on both affected facilities (in terms of reduced manpower to respond to data collection requests) and the EPA (in terms of preparing and distributing data collection requests and assessing the results).
State , local , and tr ibal agencies could also benefit from more streamlined and accurate review of electronic data submitted to them. The ERT would allow for an electronic review process rather than a manual data assessment making review and evaluation of the source provided d ata and calculations easier and more efficient . Finally, another benefit of the proposed data submittal to WebFIRE electronically is that these data would greatly improve the overall quality of existing and new emission s factors by supplementing the pool o f emissions test data for establishing emission s factor s and by ensuring that the factors are more representative of current industry operational procedures. A common complaint heard from industry and regulators is that emission factors are outdated or not representative of a particular source category. With timely receipt and incorporati on of data f rom most performance tests , the EPA would be able to ensure that emission factors, when updated, represent the***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 129 of 225
most current range of operational practices. In s ummary, in addition to supporting regulation development, control strategy development, and other air pollution control activities, having an electronic database populated with performance test data would save industry,
state , local , tribal agencies , and t he EPA significant time , money , and effort while also improv ing the quality of emission inventories and , as a result, air quality regulations
. 3. Emissions Averaging We are proposing to add an emissions averaging option for electric arc furnace stack emiss ions ( PM , mercury, PAH , HCl , HF, or formaldehyde )
. We are also proposing to allow averaging between existing process fugitive control devices for PM stack emissions and between existing crushing and screening equipment for PM stack emissions
. If you have m ore than one existing emission source ( e.g. , electric arc furnace ) located at one or more contiguous properties, which are under common control of the same person (or persons under common control), you may demonstrate compliance by emission averaging
among the existing emission sources , if your averaged emissions for such emission sources are equal to or less than the applicable emission limit. As part of the EPA‘s general policy of encouraging the use of flexible compliance approaches where they can be pro perly monitored and enforced, we are including emissions averaging in this proposed rule. Emissions averaging can provide sources the flexibility to***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 130 of 225 comply in the least costly manner while still maintaining regulation that is workable and enforceable. Emis sions averaging would not be applicable to new affected sources
. Emissions averaging would allow owners and operators of an affected source to demonstrate that the

source complies with the proposed emission limits by averaging the emissions from an individ ual affected emission unit that is emitting above the proposed emission limits with other affected emission unit at the same facility that are emitting below the proposed emission limits and that are within the same averaging group , as described below
. Thi s proposed rule includes an emissions averaging compliance alternative because emissions averaging represents an equivalent, more flexible, and less costly alternative to controlling certain emission points to MACT levels. We have concluded that a limited form of averaging could be implemented that would not lessen the stringency of the MACT limits and would provide flexibility in compliance, cost and energy savings to owners and operators of existing sources
. We also recognize that we must ensure that any emissions averaging option can be implemented and enforced, will be clear to sources, and most importantly, will be no less stringent than unit by unit implementation of the MACT limits. The EPA has concluded that it is permissible to establish within

a NE SHAP a unified compliance regimen that permits averaging within

an affected source across individual a ffected units subject to the***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 131 of 225 standard under certain conditions. Averaging across affected units is permitted only if it can be demonstrated that the total quantity of
any regulated pollutant that may be emitted by that portion of a contiguous major source that is subject to the NESHAP will not be greater under the averaging mechanism than it could be if each individual affected unit complied separately with the applicable

s tandard. Under this test, the practical outcome of averaging is equivalent to compliance with the MACT limits by each discrete unit, and the statutory requirement that the MACT standard reflect the maximum achievable emissions reductions i s, therefore, fully effectuated. In past rulemakings, the EPA has generally imposed certain limits on the scope and nature of emissions averaging programs. These limits include: (1) n o averaging between different types of pollutants; (2) no averaging betwe en sources that are not part of the

same affected source; (3) no averaging between individual sources within a single major source if the individual sources are not subject to the same NESHAP; and (4) no averaging between existing sources and new sources. This proposed rule would fully satisfy each of these criteria. First, emissions averaging would only be permitted between individual sources at a single existing affected source, and would only be permitted between individual sources subject to the
propose d Ferroalloys Production NESHAP. Further, emissions averaging would not be permitted between two or more different affected***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 132 of 225 sources. Finally, new affected sources could not use emissions averaging. Accordingly, we have concluded that the averaging of emiss ions across affected units is consistent with the CAA. In addition, this proposed rule would require each facility that intends to utilize emission averaging to submit an emission averaging plan, which provides additional assurance that the necessary crite ria will be met . In this emission averaging plan, the facility must include the identification of: (1) a ll units in the averaging group; (2) the control technology installed; (3) the process parameter s that will be monitored; (4) the specific control techn ology or pollution prevention measure (s) to be used; (5) the test plan for the measurement of the HAP being averaged; and (6) the operating parameters to be monitored for each control device. Upon receipt, the regulatory authority would not be able to appr ove an emission averaging plan containing averaging between emissions of different types of pollutants or between different affected sources (e.g., between furnaces and crushing and screening equipment)
. This proposed rule would also exclude new affected s ources from the emissions averaging provision. The EPA believes emissions averaging is not appropriate for new affected sources because it is most cost effective to integrate state

- of

- the

- art controls into equipment design and to install the technology dur ing construction of

new sources. One reason we allow emissions averaging is to give existing sources flexibility to achieve compliance at diverse points***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 133 of 225 with varying degrees of add

- on control already in place in the most
cost

- effective and technically reas onable fashion. This flexibility is not needed for new affected sources because they can be designed and constructed with compliance in mind. In addition, we seek comment on use of a discount factor when emissions averaging is used and on the appropriate v alue of a discount factor, if used. Such discount factors ( e.g. , 10 percent) have been used in previous NESHAP, particularly where there was variation in the types of units within a common source category to ensure that the environmental benefit was being achieved. In this situation, however, the affected sources are more homogeneous, making emissions averaging a more straight forward analysis. Further, with the monitoring and compliance provisions that are being proposed, there is additional assurance that the environmental benefit will be realized. The emissions averaging provisions in this proposed rule are based in part on the emissions averaging provisions in the Hazardous Organic NESHAP (HON). The legal basis and rationale for the HON emissions averagi ng provisions were provided in the preamble to the final HON. 33
3
. Other Changes The following lists additional minor changes to the NESHAP we are proposing. The main focus of these changes is to ensure that the rule provides adequate monitoring, reporting, recordkeeping and

33 Hazardous Organic NESHAP (59 FR 19425; April 22, 1994).***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 134 of 225 testing provisions to ensure that the affected sources are able to demonstrate continuous compliance with the proposed standards. These changes reflect changes we have made to many other existing NESHAP to improve the quality of these co mpliance requirements. This list also includes proposed rule changes that address editorial corrections and plain language revisions:

Re duce frequency of emission testing for the primary furnace control devices for PM and propose periodic testing for PM an d other regulated pollutants. This change is possible because of requirement to conduct continuous monitoring . Also add a periodic testing requirement for the building ventilation system control devices and crushing and screening equipment control devices. Add requirement for new and existing baghouses that control furnace or building ventilation systems to be equipped with BLDS to demonstrate continuous compliance. Retain provisions for baghouses to have a baghouse SOP manual. Add requirements to implement and enforce more detailed requirements for continuous parameter monitoring systems to ensure continuous compliance. Reduce the shop building opacity limit to 10 percent opacity to reflect current industry performance. Eliminate 6

- minute excursion level be cause it does not provide any significant flexibility (sources that tend to exceed the general opacity limit in any 6

- minute period tend to do so for several minutes so that the excursions for one 6

- minute period is meaningless). Eliminate events excluded from the opacity observation as they are infrequent, can be avoided in s o me cases, are emitted from operations we intend to control better, and can be confusing to enforce. Change the format of the PM standards to reflect an outlet concentration format (mg /dscm). This format is the direct output of the emissions test and reflects the constant output nature of the predominant control device, i.e. , a baghouse. Add PM continuous emissions monitoring system as an alternative to installing and operating a BLDS . Change the title s of sections in the subpart to better reflect the description of proposed requirements and to make the regulation easier for the reader to navigate.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 135 of 225 Update the recordkeeping and reporting sections to reflect the new monitoring requiremen ts and monitoring options described above. Update the compliance dates to include the anticipated dates the proposed requirements will become effective.

F . What c ompliance d ates are we proposing? We are proposing that facilities must comply with the new proposed requirements in this action (which are being proposed under CAA sections 112(d)(2), 112(d)(3), 112(d)(6 ) and 112(f)(2) for all affected sources) , no later than 2 years after the effective date of this rule. In the period between the effective date of this rule and the compliance date, existing sources would continue to comply with the existing requirements specified in §§63.1650 through 63.1661
. Under 40 CFR 63.6(i)( 4 )(ii), ―the owner or operator of an existing source unable to comply with a relev ant standard established ...pursuant to section 112(f)...may request that the Administrator grant an extension allowing the source up to 2 years after the standard‘s effective date to comply with the standard.‖ The rule further specifies a written application for such a request. Here, the EPA is already fully aware of the steps needed for each source to comply with the proposed standards and to reasonably estimate the amount of time it will take each source to do so. We believe that the 2

- year extension would b e warranted in all cases for sources needing to upgrade current practice. This includes the time needed to : construct required building ventilation systems and i nstall associated control***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 136 of 225 devices for process fugitive sources; determine appropriate mercury

a nd PAH control devices, locations, amount and type of carbon needed and assess potential waste disposal issues; select and install appropriate monitoring technologies; seek bids, select a vendor, install and test the new equipment; and, purchase, install a nd conduct QA and quality control measures on compliance monitoring equipment (see Estimated Time Needed to Achieve Compliance with The Proposed Revisions to the MACT standard for Ferroalloys Production Facilities , which is available in the docket for this proposed action)
. The EPA believes it reasonable to interpret 40 CFR 63.6(i)(4)(ii) to allow this plenary finding, rather than utilizing a facility

- by

- facility application process, when the facts are already known and a category

- wide adjudication is there fore possible. In addition, utilizing this process allows for public comment on the issue which would not be possible if a case

- by

- case application process with a 90

- day window for completion were used.
V. Summary of Cost, Environmental, and Economic Impac ts
A. What are the affected sources? We anticipate that the two manganese production ferroalloys production facilities currently operating in the United States will be affected by these proposed amendments. We do not know of any new facilities that are exp ected to be constructed in the foreseeable future . However, there is one facility that has a permit to produce ferromanganese or silicomanganese in an electric arc furnace, but it***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 137 of 225 did so for only a brief period, several years ago. It is possible that this facility could resume production or another non

- manganese ferroalloy producer could decide to commence production of ferromanganese or silicomanganese. One of the existing facilities is considering building a new manganese furnace, but their timeline and

a ctual intent to go forward is unclear. Given this uncertainty, our impact analysis is focused on the two existing sources that are currently operating.
B . What are the air quality impacts? The EPA estimated the emissions reductions that are expected to

res ult from the proposed amendments to the 199 9 NESHAP compared to the 20 10 baseline emission s estimates
. A detailed documentation of the analysis can be found in: Draft Cost Impacts of the Revised NESHAP for the Ferroalloys Production Source Category . Emissi ons of metal HAP from ferroalloys production sources have declined in recent years, primarily as the result of state actions and also due to the industry‘s own initiative. The current proposal
would cut HAP emissions (primarily metal HAP such as manganese, arsenic and nickel) by 6 0 percent from their current levels
. Under the proposed emissions limit for process fugitives emissions from the furnace building , we estimate that the HAP emissions reductions would be 81 TPY , including significant reductions of m anganese . We also anticipate mercury reductions of 420 lb/yr and PAH reductions of 2.5***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 138 of 225
TPY from installation of activated carbon injection controls at one facility
. Based on the emissions data available to the EPA, we believe that both facilities will be able to comply with the proposed emissions limits for HCl , HF , and formaldehyde without additional controls. There may be some formaldehyde emission reductions at the facility that we believe will be required to install an activated carbon injection system , but we have not quantified thes e reductions because of the uncertainty of the effectiveness of the activated carbon system designed for mercury and PAH removal compared to formaldehyde removal. We do not anticipate any reductions in the acid gas pollutan ts.
C. What are the cost impacts? Under the proposed amendments, ferroalloys production facilities are expected to incur capital costs for the installation of ductwork and baghouses for building ventilation and activated carbon injection systems. There wou ld also be capital costs associated with installing new or improved continuous monitoring systems, included installation of BLDS on the furnace and building ventilation baghouses that are not currently equipped with these systems. The capital costs for ea ch facility were estimated based on the number and types of upgrades required. The memorandum Draft Cost Impacts of the Revised NESHAP for the Ferroalloys Production Source***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 139 of 225 Category includes a complete description of the cost estimate methods used for this analysis and is available in the docket. The majority of the capital costs estimated for compliance with the amendments proposed in this action are for purchasing new control devices
. For the shop building ventilation system, we assumed that each facility would need to install a building ventilation system in order to comply with the proposed shop building emissions limits. For each facility, we estimated the square footage of shop building air that would need to be evacuated and the size of control device that would be required. Although the proposed amendments would provide the alternative option to install monitors at or near the property boundary to demonstrate compliance with the building ventilation requirements, we assume that sources would be un like ly to meet the alternative standard without improving the level of control in the shop building
. To estimate the cost for the building ventilation fabric filter,

we contacted a vendor who had recently supplied a fabric filter to one of the facilities to o btain assistance in developing a cost estimate for the installation. The equipment

- only cost supplied by the vendor was used in conjunction with techniques described in the sixth edition of the EPA Air Pollution Control Cost Manual 34 to estimate total insta lled capital cost and annual costs.

34 http://epa.gov/ttn/catc/products.html#cccinfo

.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 140 of 225 Our cost model included installation of the baghouse and any necessary fans, ductwork, and site work, including extra ductwork for connection to the building roof monitors. The total installed capital cost of three fabr ic filters (two at one facility, one at the second facility) designed for a flow

- rate of 150,000 actual cubic feet per minute was estimated at $9.4 million. The a nnualized capital cost and operational and maintenance costs are estimated at $2.3 million, vi a techniques described in the sixth edition of the EPA Air Pollution Control Cost Manual. The annualized cost assumes a 20

- year life expectancy for the unit and, to be consistent with OMB Guidance in Circular A

- 4, a 7 percent cost of capital as an estimate of the annualized capital cost. We considered installation of both fixed carbon beds and activated carbon injections for the control of mercury and PAH emissions. After talking to carbon vendors, we learned that fixed carbon beds are not a viable option g iven the size of the furnace airstream we would need to control. We also considered whether to put the activated carbon injection upstream or downstream of the existing
PM control device. By installing the system downstream of the PM control device, we wou ld avoid potential concerns with the activated carbon interfering with potential sale or reuse of baghouse dust or potential increase in mercury load in the scrubber sludge impoundment. This approach requires installation of a separate ―polishing‖ baghouse to capture the injected carbon for disposal.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 141 of 225 Unlike activated carbon systems used primarily for control of volatile organic compounds, we have been told that mercury impregnated compounds cannot be recycled. There is concern that such downstream control could result in sufficient concentration of mercury in the baghouse dust that the facility would be required to treat such dust as a hazardous waste under the RCRA. However, based on conversations with vendors and other mercury control experts, we believe that the resulting waste will most likely be nonhazardous. We are seeking comments on the cost methodology and assumptions used to develop these cost estimates. Costs for Activated Carbon Injection (ACI) were estimated using cost equations developed for t he Utility NESHAP 35 . The calculated equipment costs for ACI and fabric filters were used in conjunction with techniques described in the sixth edition of the EPA Air Pollution Control Cost Manual to estimate total installed capital cost and annual costs. Ou r cost model included installation of the
two ACI systems, one polishing fabric filter, and associated fans, ductwork, and site work. We estimate the total capital costs are $ 1
. 7 million and the annual costs are $1. 4 million
. The estimated costs for the pr oposed change to the monitoring requirements for baghouses, including installation of seven new BLDS for four existing furnace baghouses and three building ventilation

35 Sargent & Lundy, IPM Model

- Revisions to C ost and Performance for APC Technologies, Mercury Control Cost Development Methodology Final, March, 2011. http://www.epa.gov/airmarkt/progsregs/epa

- ipm/docs/append5_3.pdf

.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 142 of 225 baghouses is $ 270 ,000 of capital cost . The capital cost for a differential pressure moni tor to ensure that shop buildings are under negative pressure is $9 , 200. The capital cost estimated for a continuous parameter monitoring system for the wet scrubber at one facility is estimated to be $ 50,000 . Finally, the estimated capital cost for carbon injection monitoring is $20,000. The capital costs for all additional monitoring and recordkeeping requirements, including the baghouse monitoring proposed, is estimated at $ 34 0 , 2 00
. Annualized costs are estimated to be $ 94 ,000 for the BLDS , $ 18 ,000 for the scrubber parameter monitoring system, and $ 6,200 for the carbon injection monitor ing system . There is also an estimated annualized cost to monitor the manganese ore content for mercury emissions of $1,200. The estimated annual cost for reporting and

re cordkeeping is $37,000. We estimate the costs of the periodic performance testing requirements to be $800,000. The resulting total annualized costs are $ 3 47 ,000. The total annualized costs for the proposed rule are estimated at $ 4
. 0 million (20 10 dollars). Table 6 provides a summary of the estimated costs and emissions reductions associated with the proposed amendments to the Ferroalloys Production NESHAP presented in today‘s action.
Table 6
. Estimated Costs and Reductions for the Proposed Standards in this Action Proposed Amendment Estimated

Capital Estimated

Annual Total HAP

Emissions Reductions Cost

Effectiveness in $ per ton***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 143 of 225
Cost ($MM) 1 Cost

($MM) ( TPY ) total HAP reduction (and in $ per pound) Capture and Control Process Fugitives 9.4 2.3 81 (of meta l HAP) $ 0. 0 3 MM per

ton ($ 14 per pound) MACT Limits for Mercury 1.7 1. 4 0.2 (of mercury) $ 6
. 7 MM per

ton ($ 3, 3 00 per pound) MACT Limits for c o control of PAH NA N/A 2.5 (of PAH ) N/A

H Cl, HF, and f ormal

dehyde concen tration l imits 0 0 0 N/A

Compliance testing over 3

- year period N/A 0. 26 N/A N/A

Annual average monitoring over 3

- year period 0. 11 0. 08 N/A N/A

D. What are the economic impacts? We estimate that there will be no more than a 0.2 percent price change and a similar reduction in output associ ated with the proposal. The impacts to affected firms will be low because the annual compliance costs are quite small when compared to the annual revenues for the two affected parent firms (much less than 1 percent for each). The impacts to affected consum ers should also be quite small. Thus, there will not be any significant impacts on affected firms and their consumers as a result of this proposal.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 144 of 225
E. What are the benefits? We estimate the monetized benefits of thi s regulatory action to be $ 70 million to $ 180 m illion (20 10 $), at a 3 percent discount rate in the implementation year ( 201 5 ). The monetized benefits of the regulatory action at a 7 percent discount rate are $ 60 m illion to $ 160 m illion (20 10 $) in the same implementation year. Using alternate rela tionships between PM 2.5 and premature mortality supplied by experts, higher and lower benefits estimates are plausible, but most of the expert

- based estimates fall between these two estimates. 36 A summary of the monetized benefits estimates at discount rate s of 3 percent and 7 percent is in Table 7 of this preamble. Table 7
. Summary of the Monetized Benefits Estimates f or the Ferroalloys Industry in 2015 (millions of 20 10 $)

Pollutant Estimated

Emission Reductions (tpy) Total Monetized

Benefits (3% Discount Rate) Total Monetized Benefits (7% Discount Rate) PM 2.5 257 $ 70 to $ 180 $ 60 to $ 160 1 All estimates are for the implementation year ( ―2015‖, assuming the final rule is published in January 2012 ) and are rounded to two significant figures so numbers may n ot sum across rows. All fine particles are assumed to have equivalent health effects
. Benefits from reducing HAP s emissions are not included. These benefits estimates represent the total monetized human health benefits for populations exposed to less PM 2 .5 in 2015 from controls installed to reduce air pollutants in order to meet these proposed standards. These estimates are calculated as the sum of the monetized value of avoided premature mortality from reducing PM 2.5 . To

36 Roman, et al., 2008. Expert Judgment Assessment of the Mortality Impact of Changes in Ambient Fine Particulate Matter in the U.S. Environ. Sci. Technol., 42, 7, 2268

– 2274.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 145 of 225 estimate human health benefits de rived from reducing PM 2.5 , we used the general approach and methodology laid out in Fann, Fulcher, and Hubbell (2009). 37 In this proposal , we also included source apportionment consideration based on current air quality modeling for the ferroalloys industry
. 38 Therefore all benefits per ton estimates are specific to the ferroalloys sector. To generate the BPT estimates, we used a model to convert emissions of direct PM 2.5 into changes in ambient PM 2.5 levels and another model to estimate the changes in human health associated with that change in air quality. Finally, the monetized health benefits were divided by the emission reductions to create the BPT estimates. These models assume that all fine particles, regardless of their chemical composition, are equall y potent in causing premature mortality because there is no clear scientific evidence that would support the development of differential effects estimates by particle type. In this rule only d irectly emitted PM 2.5 is considered . Direct
PM 2.5 emissions conv ert directly into ambient PM 2.5 ; thus, to the extent that emissions occur in population areas, exposures to direct
PM 2.5 will tend to be higher than exposure to any other precursor , and monetized health benefits will be higher as well
.

37 Fann, N., C.M. Fulcher, B.J. Hubbell. 2009. ―The influence of location, source, and emission type in estimates of the human health benefits of reducing a ton of ai r pollution.‖ Air Qual Atmos Health (2009) 2:169

– 176. 38 U.S. Environmental Protection Agency. 2011. Technical support document: Estimating the benefit per ton of reducing PM 2.5 precursors from the ferroalloy sector (Draft) ; EPA: Research Triangle Park, NC.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 146 of 225 For context, it is important to note that the magnitude of the PM benefits is largely driven by the concentration response function for premature mortality. Experts have advised the EPA to consider a variety of assumptions, including estimates based on both empirical (epidem iological) studies and judgments elicited from scientific experts, to characterize the uncertainty in the relationship between
PM 2.5 concentrations and premature mortality. For this rule, we cite two key empirical studies, the American Cancer Society cohor t study 39 and the extended Six Cities cohort study. 40 In the Regulatory Impact Analysis ( RIA ) 41 for this rule, we also include benefits estimates derived from expert judgments and other assumptions. The EPA strives to use the best available science to support our benefits analyses. We recognize that interpretation of the science regarding air pollution and health is dynamic and evolving. After reviewing the scientific literature and recent scientific advice, we have determined that the no

- threshold model is th e most appropriate model for assessing the mortality benefits associated with reducing
PM 2.5 exposure. Consistent with this recent advice, we are replacing the previous threshold sensitivity analysis with a new ―Lowest
Measured Level (LML)‖ assessment. Whi le an LML assessment provides

39 Pope et al, 2002. ―Lung Cancer, Cardiopulmonary Mortality, and Long

- term Exposure to Fine Particulate Air Pollution.‖ Journal of the American Medical Association. 287:1132

- 1141. 40 Laden et al, 2006. ―Reduction in Fine Particulate Air Pollution and Mortality.‖ American Journal of Respiratory and Critical Care Medicine
. 173: 667

- 672. 41 U.S. Environmental Protection Agency, 2006. Final Regulatory Impact Analysis: PM 2.5 NAAQS. Prepared by Office of Air and Radiation. October. Available on the Internet at h ttp://www.epa.gov/ttn/ecas/ria.html.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 147 of 225 some insight into the level of uncertainty in the estimated PM mortality benefits, the EPA does not view the LML as a threshold and continues to quantify PM

- related mortality impacts using a full range of modeled air quality c oncentrations. Most of the estimated PM

- related benefits in this rule would accrue to populations exposed to higher levels of PM 2.5 . Using the Pope, et al., (2002) study, 85 percent of the population is exposed at or above the LML of 7.5 μg/m 3 . Using the L aden, et al., (2006) study, 40 percent of the population is exposed above the LML of 10 μg/m 3 . It is important to emphasize that we have high confidence in
PM 2.5 - related effects down to the lowest LML of the major cohort studies. This fact is important, be cause as we estimate PM

- related mortality among populations exposed to levels of PM 2.5 that are successively lower, our confidence in the results diminishes. However, our analysis shows that the great majority of the impacts occur at higher exposures. Thi s analysis does not include the type of detailed uncertainty assessment found in the 2006 PM 2.5 NAAQS RIA because we lack the necessary air quality input and monitoring data to run the benefits model. In addition, we have not conducted any air quality mode ling for this rule. However, to estimate BPT specifically for this sector we did have some updated air quality modeling. The 2006 PM 2.5 NAAQS benefits analysis provides an indication of the sensitivity of our results to various assumptions.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 148 of 225 It should be em phasized that the monetized benefits estimates provided above do not include benefits from several important benefit categories, including reducing other air pollutants, ecosystem effects, and visibility impairment, as well as mercury and formaldehyde amon g other HAPs . Although we do not have sufficient information or modeling available to provide monetized estimates for this rulemaking, we include a qualitative assessment of the health effects of these other effects in the R IA 42 for this proposed rule
. F. W hat demographic groups might benefit the most from this regulation? To examine the potential for any environmental justice (EJ) issues that might be associated with the source category, we performed a demographic analysis of the at

- risk population. In this analysis, we evaluated the distributions of HAP

- related cancer and noncancer risks from the Ferroalloys Production source category across different social, demographic and economic groups within the populations living near these two facilities. The method ology and the results of the demographic analyses are included in a technical report , Risk and Technology Review

– Analysis of Socio

- Economic Factors for Populations Living Near Ferroalloys Facilities , available in the docket for this action
.

42 U.S. Environmental Protection Agency. Draft Regulatory Impact Analysis (RIA) for the Proposed Manganese Ferroalloys RTR . September 2011***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 149 of 225 The results of the demographic analys i s are summarized in Table 8 below. These results, for various demographic groups, are based on the estimated risks from actual emissions levels for the population living within 50 km of the facilities.
TABLE 8
. F erroalloy Product ion D emographic R isk A nalysis R esults

Nationwide Population with

Cancer Risk at or Above 1

- in

- 1 Million Population with

Chronic Hazard Index Above 1 Total P opulation 285,000,000 26,000 28,000 Race by Percent White 75 97 97 All Other Races 25 3 3 Rac e by Percent White 75 97 97 African American 12 1 0.8 Native American 0.9 0.3 0.3
Other and Multiracial 12 2 1.8 Ethnicity by Percent Hispanic 14 1 0.7 Non

- Hispanic 86 99 99 Income by Percent Below Poverty L evel 13 13 13 Above Poverty L evel 87 87 87 Education by Percent Over 25 and without H igh School D iploma 13 11 9

Over 25 and with a High School D iploma 87 89 91***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 150 of 225 The results of the Ferroalloy P roduction source category demographic analysis indicat e that there are approximately 2 6,000 people exposed to a cancer risk at or above one in one million and approximately 28,000 people exposed to a chronic noncancer TOSHI greater than 1 due to emissions from the source category (we note that many of those in the first risk group are the same as those in the second)
. The percentages of the at

- risk population in each demographic group are similar to or lower than their res pective nationwide percentages. Implementation of the provisions included in this proposal is expected to significantly reduce the nu mber of at

risk people due to HAP emissions from these sources ( from 26,000 people to about 1,000 for cancer risks and from 28,000 people to less than 10 for chronic noncancer TOSHI)
. VI . Request for Comments We are soliciting comments on all aspects of th is proposed action. In addition to general comments on this proposed action, we are also interested in any additional data that may help to reduce the uncertainties inherent in the risk assessment and other analyses. We are specifically interested in recei ving corrections to the site

specific emissions profiles used for risk modeling. Such data should include supporting documentation in sufficient detail to allow characterization of the quality and representativeness of the data or information. Section VII of this preamble provides more information on submitting data.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 151 of 225
VII . Submitting Data Corrections The site

- specific emissions profiles used in the source category risk and demographic analyses are available for download on the RTR

w eb p age at: http://www.epa .gov/ttn/atw/rrisk/rtrpg.html

. The data files include detailed information for each HAP emissions release point for the facilit ies included in the source category. If you believe that the data are not representative or are inaccurate, please identify the data in question, provide your reason for concern, and provide any ―improved‖ data that you have, if available. When you submit data, we request that you provide documentation of the basis for the revised values to support your suggested changes. To submit comments on the data downloaded from the RTR Web page, complete the following steps:
1
. Within this downloaded file, enter suggested revisions to the data fields appropriate for that information. The data fields that may be revised include the following:

Data Element Definition Control Measure Are control measures in place? (yes or no)
Control Measure Comment Select control measure from list provided, and briefly describe the control measure Delete Indicate here if the facility or record should be delet ed Delete Comment Describes the reason for deletion Emissions Calculation Method Code For Revised Emissions Code description of the method used to derive emissions. For example, CEM, material balance, stack test, etc. Emissions Process Group Enter the g eneral type of emissions process associated with the specified emissions point***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 152 of 225
Data Element Definition

Fugitive Angle Enter release angle (clockwise from true North); orientation of the y

- dimension relative to true North, measured positive for clockwise starting at 0 degrees (ma ximum 89 degrees) Fugitive Length Enter dimension of the source in the east

- west (x

- ) direction, commonly referred to as length (ft) Fugitive Width Enter dimension of the source in the north

- south (y

- ) direction, commonly referred to as width (ft) Malfu nction Emissions Enter total annual emissions due to malfunctions ( tpy ) Malfunction Emissions Max Hourly Enter maximum hourly malfunction emissions here (lb/hr)

North American Datum Enter datum for latitude/longitude coordinates (NAD27 or NAD83); if left blank, NAD83 is assumed Process Comment Enter general comments about process sources of emissions REVISED Address Enter revised physical street address for MACT facility here REVISED City Enter revised city name here REVISED County Name Enter revised county name here REVISED Emissions Release Point Type Enter revised Emissions Release Point Type here REVISED End Date Enter revised End Date here REVISED Exit Gas Flow Rate Enter revised Exit Gas Flowrate here (ft 3 /sec) REVISED Exit Gas Temperature E nter revised Exit Gas Temperature here (F) REVISED Exit Gas Velocity Enter revised Exit Gas Velocity here (ft/sec) REVISED Facility Category Code Enter revised Facility Category Code here, which indicates whether facility is a major or area source REVI SED Facility Name Enter revised Facility Name here REVISED Facility Registry Identifier Enter revised Facility Registry Identifier here, which is an ID assigned by the EPA Facility Registry System REVISED HAP Emissions Performance Level Code Enter revise d HAP Emissions Performance Level here***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 153 of 225
Data Element Definition REVISED Latitude Enter revised Latitude here (decimal degrees) REVISED Longitude Enter revised Longitude here (decimal degrees) REVISED MACT Code Enter revised MACT Code here REVISED Pollutant Code Enter revised Pollutant Code here REVISED Routine Emissions Enter revised routine emissions value here ( tpy ) REVISED SCC Code Enter revised SCC Code here REVISED Stack Diameter Enter revised Stack Diameter here (ft) REVISED Stack Height Enter revised Stack Height here (ft) REVISED Start Date Enter revised Start Date here REVISED State Enter revised State here REVISED Tribal Code Enter revised Tribal Code here REVISED Zip Code Enter revised Zip Code here Shutdown Emissions Enter total annual emissions due to sh utdown events ( tpy ) Shutdown Emissions Max Hourly Enter maximum hourly shutdown emissions here (lb/hr) Stack Comment Enter general comments about emissions release points Startup Emissions Enter total annual emissions due to startup events ( tpy ) Startu p Emissions Max Hourly Enter maximum hourly startup emissions here (lb/hr) Year Closed Enter date facility stopped operations

2. Fill in the commenter information fields for each suggested revision (i.e., commenter name, commenter organization, commente r e mail address, commenter phone number, and revision comments). 3. Gather documentation for any suggested emissions revisions (e.g., performance test reports, material balance calculations). 4. Send the entire downloaded file with suggested revisions in Microsoft® Access format and all accompanying documentation to Docket ID Number EPA

- HQ

- OAR

- 2010

- 0895 (through one of the methods described in the ADDRESSES section of this preamble). To expedite review of the***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 154 of 225 revisions, it would also be helpful if you sub mitted a copy of your revisions to the EPA directly at RTR@epa.gov in addition to submitting them to the docket. 5. If you are providing comments on a facility, you need only submit one file for that facility, which should contain all suggested changes for all sources at that facility. We request that all data revision comments be submitted in the form of updated Microsoft® Access files, which are provided on the RTR Web Page at: http://www.epa.gov/ttn/atw/rrisk/rtrpg.html

. V III . Statutory and Executive Order Reviews
A. Executive Order 12866: Regulatory Planning and Review and Executive Order 13563: Improving Regulation and Regulatory Review Under Section 3(f)(1) of Executive Order 12866 (58 FR 51735, October 4, 1993), this a ction is an "economically significant regulatory action‖ because it is likely to have an annual effect on the economy of $100 million or more . Accordingly, the EPA submitted this action to OMB for review under Executive Orders 12866 and 13563 (76 FR 3821, January 21, 2011), and any changes made in response to OMB recommendations have been documented in the docket for this action. In addition, the EPA prepared an analysis of the potential costs and benefits associated with this action. This analysis is conta ined in the RIA for this proposed rule. A copy of the analysis is***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 155 of 225 available in the docket for this action, and the analysis is briefly summarized here
. The proposed rule will reduce emissions of directly emitted PM and estimates of the PM 2.5 benefits of t hese air quality improvements may be found in Table 2 of this preamble. When characterizing uncertainty in the PM

- mortality relationship, the EPA has historically presented a sensitivity analysis applying alternate assumed thresholds in the PM concentratio n - response relationship. In its synthesis of the current state of the PM science, the EPA‘s 2009 Integrated Science Assessment for Particulate Matter concluded that a

no - threshold log

- linear model most adequately portrays the PM

mortality concentration

- res ponse relationship. In the RIA accompanying this rulemaking, rather than segmenting out impacts predicted to be associated with levels above and below a ―bright line‖ threshold, the EPA includes a LML analysis that illustrates the increasing uncertainty th at characterizes exposure attributed to levels of PM 2.5 below the LML of each epidemiological study used to estimate PM 2.5 - related premature death. Figures provided in the RIA show the distribution of baseline exposure to PM 2.5, as well as the lowest air quality levels measured in each of the epidemiology cohort studies. This information provides a context for considering the likely portion of PM

- related mortality benefits occurring above or below the LML of each study; in general, our confidence in the si ze of the estimated reduction PM 2.5 - related***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 156 of 225 premature mortality diminishes as baseline concentrations of PM 2.5 are lowered. Using the Pope, et al. (2002) study, 86 percent of the population is exposed at or above the LML of 7.5 μg/m 3 . Using the Laden, et a l. (2006) study, 30 percent of the population is exposed at or above the LML of 10 μg/m 3 . Although the LML analysis provides some insight into the level of uncertainty in the estimated PM mortality benefits, the EPA does not view the LML as a threshold and continues to quantify PM

- related mortality impacts using a full range of modeled air quality concentrations. It is important to note that the monetized benefits include many but not all health effects associated with PM 2.5 exposure. Benefits are shown as a range from those highlighted in Pope, et al. (2002) , to those highlighted in Laden, et al. (2006). These models assume that all fine particles, regardless of their chemical composition, are equally potent in causing premature mortality because there is n o clear scientific evidence that would support the development of differential effects estimates by particle type. The cost analysis is also subject to uncertainties. More information on the cost uncertainties can be found in the RIA and in the cost memo f or the proposal
. A summary of the monetized benefits and net benefits for the proposed rule at discount rates of 3 percent and 7 percent is in Table 2 of this preamble and a more detailed discussion of the benefits is found in section V. E of this preamble.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 157 of 225 For more information on the benefits analysis, please refer to the RIA for this rulemaking, which is available in the docket.
B. Paperwork Reduction Act The information collection requirements in this rule have been submitted for approval to the Office of Management and Budget (OMB) under the Paperwork Reduction Act , 44 U.S.C. 3501 et seq . The Information Collection Request (ICR) document prepared by EPA has been assigned EPA ICR number 2448.01
. The information collection requirements are not enforceable u ntil OMB approves them. The information requirements are based on notification, recordkeeping, and reporting requirements in the NESHAP General Provisions (40 CFR part 63, subpart A), which are mandatory for all operators subject to national emissions stan dards. These recordkeeping and reporting requirements are specifically authorized by CAA section 114 (42 U.S.C. 7414). All information submitted to EPA pursuant to the recordkeeping and reporting requirements for which a claim of confidentiality is made is safeguarded according to Agency policies set forth in 40 CFR part 2, subpart B. We are proposing new paperwork requirements to the Ferroalloys Production source category in the form of increased frequency and number of pollutants tested for stack testing as described in § 63. 16 2 5(c) and tighter parameter monitoring requirements to demonstrate continuous compliance as described in §63.16 2 5(c)(6) and §63.16 2 6
. In conjunction shop building process fugitives monitoring,***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 158 of 225 we believe that sources are currently equ ipped with adequate monitoring equipment and that the facilities will not incur a capital cost due to this requirement.
For th is proposed rule, the EPA is adding affirmative defense to the estimate of burden in the ICR. To provide the public with an estim ate of the relative magnitude of the burden associated with an assertion of the affirmative defense position adopted by a source, the EPA has provided administrative adjustments to this ICR to show what the notification, recordkeeping and reporting require ments associated with the assertion of the affirmative defense might entail. The EPA‘s estimate for the required notification, reports and records for any individual incident, including the root cause analysis, totals $3,141 and is based on the time and ef fort required of a source to review relevant data, interview plant employees, and document the events surrounding a malfunction that has caused an exceedance of an emissions limit. The estimate also includes time to produce and retain the record and report s for submission to the EPA. The EPA provides this illustrative estimate of this burden because these costs are only incurred if there has been a violation and a source chooses to take advantage of the affirmative defense. Given the variety of circumstance s under which malfunctions could occur, as well as differences among sources' operation and maintenance practices, we cannot reliably predict the severity and frequency of malfunction

- related excess emissions events for a***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 159 of 225 particular source. It is important to note that the EPA has no basis currently for estimating the number of malfunctions that would qualify for an affirmative defense. Current historical records would be an inappropriate basis, as source owners or operators previously operated their facili ties in recognition that they were exempt from the requirement to comply with emissions standards during malfunctions. Of the number of excess emissions events reported by source operators, only a small number would be expected to result from a malfunction (based on the definition above), and only a subset of excess emissions caused by malfunctions would result in the source choosing to assert the affirmative defense. Thus , we believe the number of instances in which source operators might be expected to

av ail themselves of the affirmative defense will be extremely small. For this reason, we estimate no more than 1 or 2 such occurrences for all sources subject to subpart XX X over the 3

- year period covered by this ICR. We expect to gather information on such events in the future and will revise this estimate as better information becomes available. We estimate two regulated entities are currently subject to subpart XX X and will be subject to all proposed standards. The annual monitoring, reporting, and record keeping burden for this collection (averaged over the first 3 years after the effective date of the standards) for these amendments to subpart XXX ( Ferroalloys Production ) is estimated to be $ 384 ,000 per year. This includes 4 83***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 160 of 225 labor hours per year at a to tal labor cost of $ 37,000 per year, and total non

- labor capital and operation and maintenance costs of $ 347 ,000 per year. This estimate includes performance tests, notifications, reporting, and recordkeeping associated with the new requirements for front

- e nd process vents and back

- end process operations. The total burden for the Federal government (averaged over the first 3 years after the effective date of the standard) is estimated to be 48 hours per year at a total labor cost of $ 2,200 per year. Burden i s defined at 5 CFR 1320.3(b). An agency may not conduct or sponsor, and a person is not required to respond to, a collection of information unless it displays a currently valid OMB control number. The OMB control numbers for EPA's regulations in 40 CFR are listed in 40 CFR part 9. When these ICRs are approved by OMB, the Agency will publish a technical amendment to 40 CFR part 9 in the Federal Register to display the OMB control numbers for the approved information collection requirements contained in the f inal rules. To comment on the Agency's need for this information, the accuracy of the provided burden estimates, and any suggested methods for minimizing respondent burden, EPA has established a public docket for this rule, which includes this ICR, under D ocket ID number EPA

HQ

- OAR

- 201 0

- 0 895
. Submit any comments related to the ICR to EPA and
OMB. See the ADDRESSES section at the beginning of this notice for where to submit comments to EPA. Send comments to OMB at the Office***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 161 of 225 of Information and Regulatory Aff airs, Office of Management and Budget, 725 17th Street, NW, Washington, DC 20503, Attention: Desk Office for EPA. Because OMB is required to make a decision concerning the ICR between 30 and 60 days after [ INSERT THE DATE OF PUBLICATION
OF THIS PROPOSED RU LE IN THE FEDERAL REGISTER ], a comment to OMB is best assured of having its full effect if OMB receives it by [ INSERT
THE DATE 30 DAYS AFTER THE DATE OF PUBLICATION IN THE FEDERAL
REGISTER ]
. The final rule will respond to any OMB or public comments on the information collection requirements contained in this proposal.
C. Regulatory Flexibility Act The Regulatory Flexibility Act (RFA) generally requires an agency to prepare a regulatory flexibility analysis of any rule subject to notice and comment rulemaki ng requirements under the Administrative Procedure Act or any other statute unless the agency certifies that the rule will not have a significant economic impact on a substantial number of small entities. Small entities include small businesses, small orga nizations, and small governmental jurisdictions. For purposes of assessing the impacts of this proposed rule on small entities, small entity is defined as: (1) a small business as defined by the Small Business Administration‘s (SBA) regulations at 13 CFR 121.201; (2) a small governmental jurisdiction that is a government of a city, county, town, school district or special***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 162 of 225 district with a population of less than 50,000; and (3) a small organization that is any not

- for

- profit enterprise that is independently owned and operated and is not dominant in its field. For this source category, which has the N AICS code 331 112 ( i.e. , Electrometallurgical ferroalloy product manufacturing) , the SBA small business size standard is 750 employees according to the SBA small business standards definitions
. After considering the economic impacts of today‘s proposed rule on small entities, I certify that this action will not have a significant economic impact on a substantial number of small entities. Neither of the companies a ffected by this rule is considered to be a small entity per the definition provided in this section
. D. Unfunded Mandates Reform Act This proposed rule does not contain a Federal mandate under the provisions of Title II of the Unfunded Mandates Reform Act of 1995 (UMRA), 2 U.S.C. 1531

- 1538 for s tate, local, or tribal governments or the private sector. The proposed rule would not result in expenditures of $100 million or more for s tate, local, and tribal governments, in aggregate, or the private sector in a ny 1 year. The proposed rule imposes no enforceable duties on any State, local or tribal governments or the private sector. Thus, this proposed rule is not subject to the requirements of sections 202 or 205 of the UMRA.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 163 of 225 This proposed rule is also not subje ct to the requirements of section 203 of UMRA because it contains no regulatory requirements that might significantly or uniquely affect small governments because it contains no requirements that apply to such governments nor does it impose obligations upo n them.
E. Executive Order 13132: Federalism This proposed rule does not have federalism implications. It will not have substantial direct effects on the s tates, on the relationship between the national government and the s tates, or on the distribution of power and responsibilities among the various levels of government, as specified in Executive Order 13132. None of the facilities subject to this action are owned or operated by s tate governments, and, because no new requirements are being promulgated, noth ing in this propos ed rule will supersede State regulations. Thus, Executive Order 13132 does not apply to this proposed rule. In the spirit of Executive Order 13132, and consistent with EPA policy to promote communications between EPA and State and local governments, the EPA specifically solicits comment on this proposed rule from State and local officials.
F. Executive Order 13175: Consultation and Coordination with Indian Tribal Governments
T his proposed rule does not have tribal implications, as specif ied in Executive Order 13175 (65 FR 67249, November 9, 2000)
. Thus, Executive Order 13175 does not apply to this action.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 164 of 225 The EPA specifically solicits additional comment on this proposed action from tribal officials.
G. Executive Order 13045: Protection of Children from Environmental Health Risks and Safety Risks This proposed rule is not subject to Executive Order 13045 (62 FR 19885, April 23, 1997) because the Agency does not believe the environmental health risks or safety risks addressed by this action present a disproportionate risk to children. The report , Analysis of Socio

- Economic Factors for Populations Living Near Ferroalloys Facilities , shows that , prior to the implementation of the provisions included in this proposal, on a nationwide basis, ther e are approximately 26,000 people exposed to a cancer risk at or above one in one million and approximately 28,000 people exposed to a chronic noncancer TOSHI greater than 1 due to emissions from the source category. T he percentages for all demographic gro ups , including children 18 years and younger, are similar to or lower than their respective nationwide percentages. Further, implementation of the provisions included in this proposal is expected to significantly reduce the number of at

- risk people due to HAP emissions from these sources (from between 26,000 to 28,000 people to about 1,000), providing significant benefit to all the demographic groups in the
at

- risk population. This proposed rule is expected to reduce environmental impacts for everyone, incl uding children. This action proposes emissions***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 165 of 225 limits at the levels based on MACT , as required by the CAA . Based on our analysis, w e believe that this rule does not have a disproportionate impact on children. The public is invited to submit comments or id entify peer

reviewed studies and data that assess effects of early life exposure
to manganese, lead, arsenic, nickel, or mercury
. H. Executive Order 13211: Actions Concerning Regulations That Significantly Affect Energy Supply, Distribution, or Use This ac tion is not a ―significant energy action‖ as defined under Executive Order 13211, ―Actions Concerning Regulations That Significantly Affect Energy Supply, Distribution, or Use‖ (66 FR 28355, May 22, 2001), because it is not likely to have significant adver se effect on the supply, distribution, or use of energy. This action will not create any new requirements and therefore no additional costs for sources in the energy supply, distribution, or
use sectors.
I. National Technology Transfer and Advancement Act ( NT TAA) Section 12(d) of the National Technology Transfe r and Advancement Act of 1995 (NTTAA ), Public Law No. 104

- 113, 12(d) (15 U.S.C. 272 note) directs the EPA to use voluntary consensus standards (VCS) in its regulatory activities , unless to do so would be inconsistent with applicable law or otherwise impractical. VCS are technical standards ( e.g. , materials specifications, test methods, sampling procedures, and business practices) that are developed or adopted by VCS bodies.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 166 of 225 NTTAA directs the EPA to provid e Congress, through OMB, explanations when the a gency decides not to use available and applicable VCS . This proposed rulemaking involves technical standards. EPA proposes to use EPA Methods 1, 2, 3A, 3B, 4, 5, 5D, 9, 10, 26A, 30B, 316, CARB 429, SW

- 846 M ethod 3052, SW

- 846 Method 7471b and EPA water Method 1631E of 40 CFR Part 60, Appendix A. No applicable VCS were identified for EPA Methods 30B, 5D, 316, 1631E and CARB 429, SW

- 846 Method 3052, SW

- 846 and Method 7471b. However, t he Agency has identified 2 0 VCS as being potentially applicable to these methods cited in this rule. The 20 VCS and other information and conclusions, including the search and review results are in the docket for this proposed rule. EPA welcomes comments on this aspect of this pr oposed rulemaking and, specifically, invites the public to identify potentially

applicable voluntary consensus standards and to explain why such standards should be used in this regulation. Under section 63.7(f) and section 63.8(f) of Subpart A of the
Gene ral Provisions, a source may apply to EPA for permission to use alternative test methods or alternative monitoring requirements in place of any required testing methods, performance specifications, or procedures in the proposed rule. J. Executive Order 128 98: Federal Actions to Address Environmental Justice in Minority Populations and Low

- Income Populations***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 167 of 225 Executive Order 12898 (59 FR 7629, February 16, 1994) establishes f ederal executive policy on environmental justice. Its main provision directs f ederal agencies, to the greatest extent practicable and permitted by law, to make environmental justice part of their mission by identifying and addressing, as appropriate, disproportionately high and adverse human health or environmental effects of their program s, policies, and activities on minority populations and low

- income populations in the United States.
T he EPA has determined that the current health risks posed by emissions from this source category are unacceptable. There are about 26,000 to 28,000 peopl e nationwide that are currently subject to health risks which are non

- negligible (i.e., cancer risks greater than one in one million or chronic noncancer TOSHI greater than 1) due to emissions from this source category. The demographic makeup of this ―at

- r isk‖ population is similar to the national distribution for all demographic groups . The proposed rule will reduce the number of people in this at

- risk group from between 26,000

- 28,000 people to about 1,000 people. Based on this analysis, the EPA has dete rmined that the proposed rule will not have disproportionately high and adverse human health or environmental effects on minority or low

income populations because it increases the level of environmental protection for all affected populations
.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 168 of 225 National Emission St andards for Hazardous Air Pollutants: Ferroalloys Production

List of Subjects in 40 CFR Part 63 Environmental protection, Air pollution control, Hazardous substances, Incorporation by reference, Reporting and recordkeeping requirements.

___ _________________________ Dated:

____________________________ Lisa P. Jackson, Administrator.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 169 of 225 For the reasons stated in the preamble, part 63 of title 40, chapter I, of the Code of Federal Regulations is proposed to be amended as follows: PART 63 — [AME NDED] 1. The authority citation for part 63 continues to read as follows: Authority: 42 U.S.C. 7401, et seq. 2. Section 63.14 is amended by: to be added §63.14 Incorporations by reference.
* * * * * To be added Subpart XXX

— [AMENDED] 3. Section 63.1620 is added to read as follows: § 63.1620 Am I subject to this subpart? (a) You are subject to this subpart if you own or operate a new or existing ferromanganese and/or silicomanganese production facility that is a major source or is co

- located at a major source of hazardous air pollutant emissions. (b) You are subject to this subpart if you own or operate any of the following equipment as part of a ferromanganese or silicomanganese production facility: (1) Open, semi

- sealed, or sealed submerged arc furnace, (2) Casting operations, (3) Metal oxygen refining (MOR) process, (4) Crushing and screening operations,***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 170 of 225 (5) Outdoor fugitive dust sources. (c) A new affected source is any of the sources listed in paragraph (b) of this section for which construction or
reconst ruction commenced after [INSERT DATE OF PUBLICATION IN FEDERAL REGISTER]. (d) Table 1 of this subpart specifies the provisions of subpart A of this part that apply to owners and operators of ferromanganese and silicomanganese production facilities subject to this subpart. (e) If you are subject to the provisions of this subpart, you are also subject to title V permitting requirements under 40 CFR parts 70 or 71, as applicable. (f) Emission standards in this subpart apply at all times. 4. Section 63.1621 is added to read as follows: § 63.1621 What are my c ompliance dates? (a) Existing affected sources must be in compliance with the provisions specified in §§63.1620 through 63.1630 no later than [2 YEARS AFTER EFFECTIVE DATE OF FINAL RULE]. (b) Affected sources in existence prior to [INSERT DATE OF PUBLICATION OF THE PROPOSED RULE IN THE FEDERAL REGISTER] must be in compliance with the provisions specified in §§63.1650 through 63.1661 by November 21, 2001 and until [2 YEARS AFTER EFFECTIVE DATE OF FINAL RULE]. A s of [2 YEARS AFTER EFFECTIVE DATE OF FINAL RULE], the provisions of §§63.1650 through 63.1661 cease to apply to affected sources in existence prior to [INSERT DATE OF PUBLICATION OF THE***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 17 1 of 225 PROPOSED RULE IN THE FEDERAL REGISTER]. The provisions of §§63.1650
t hrough 63.1661 remain enforceable at a source for its activities prior to [2 YEARS AFTER EFFECTIVE DATE OF FINAL RULE]. (c) If you own or operate a new affected source that commences construction or reconstruction after [INSERT DATE OF PUBLICATION OF
THE P ROPOSED RULE IN THE FEDERAL REGISTER], you must comply with the requirements of this subpart by [EFFECTIVE DATE OF FINAL RULE], or upon startup of operations, whichever is later. 5. Section 63.1622 is added to read as follows: § 63.1622 What definitions app ly to this subpart? Terms in this subpart are defined in the Clean Air Act (Act), in subpart A of this part, or in this section as follows: Affirmative defense means, in the context of an enforcement proceeding, a response or defense put forward by a defen dant, regarding which the defendant has the burden of proof, and the merits of which are independently and objectively evaluated in a judicial or administrative proceeding. Bag leak detection system means a system that is capable of continuously monitoring particulate matter (dust) loadings in the exhaust of a baghouse in order to detect bag leaks and other upset conditions. A bag leak detection system includes, but is not limited to, an instrument that operates on triboelectric, light scattering, light tra nsmittance, or other effect to continuously monitor relative particulate matter loadings.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 172 of 225 Building ventilation means a system of ventilated ducts designed to place the shop building under negative pressure and to capture process fugitive emissions from the shop building. Capture system means the collection of components used to capture the gases and fumes released from one or more emissions points and then convey the captured gas stream to a control device or to the atmosphere. A capture system may include, but is not limited to, the following components as applicable to a given capture system design: duct intake devices, hoods, enclosures, ductwork, dampers, manifolds, plenums, and fans. Casting means the period of time from when molten ferroalloy is

remove d from the tapping station until pouring into casting molds or beds is completed. This includes the following operations: pouring alloy from one ladle to another, slag separation, slag removal, and ladle transfer by crane, truck, or other conveyance. Crush ing and screening equipment means the crushers, grinders, mills, screens and conveying systems used to crush, size, and prepare for packing manganese

- containing materials, including raw materials, intermediate products, and final products. Electric arc fur nace means any furnace where electrical energy is converted to heat energy by transmission of current between electrodes partially submerged in the furnace charge.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 173 of 225 Ladle treatment means a post

- tapping process including metal and alloy additions where chemi stry adjustments are made in the ladle after furnace smelting to achieve a specified product. Local ventilation means hoods and ductwork designed to capture process fugitive emissions close to the area where the emissions are generated ( e.g. , tap hoods).
M etal oxygen refining (MOR) process means the reduction of the carbon content of ferromanganese through the use of oxygen. Outdoor fugitive dust source means a stationary source from which hazardous air pollutant

- bearing particles are discharged to the
atmo sphere due to wind or mechanical inducement such as vehicle traffic. Fugitive dust sources include plant roadways, yard areas, and outdoor material storage and transfer operations. Plant roadway means any area at a ferromanganese and silicomanganese produc tion facility that is subject to plant mobile equipment, such as fork lifts, front end loaders, or trucks, carrying
manganese - bearing materials. Excluded from this definition are employee and visitor parking areas, provided they are not subject to traffic by plant mobile equipment. Primary emissions means gases and emissions collected by hoods and ductwork located above an open furnace or under the cover of a semi

- closed or sealed furnace. Process fugitive emissions source means a source of hazardous air po llutant emissions that is associated with ferromanganese or***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 174 of 225 silicomanganese production, but is not the primary exhaust stream from an electric arc furnace, MOR or crushing and screening equipment, and is not a fugitive dust source. Process fugitive

sources include emissions that escape capture from the electric arc furnace, tapping operations, casting operations, ladle treatment, MOR or crushing or screening equipment. Shop building means the building which houses one or more electric arc furnaces. Shutdown means the cessation of operation of an affected source for any purpose. Startup means the setting in operation of an affected source for
any purpose. Tapping emissions means the gases and emissions associated with removal of product from the electric arc furnace under normal operating conditions, such as removal of metal under normal pressure and movement by gravity down the spout into the ladle and filling the ladle. Tapping period means the time from when a tap hole is opened until the time a tap hole is closed. 6. Section 63.1623 is added to read as follows: § 63.1623 What are the emissions standards for new, reconstructed and existing facilities? (a) Electric arc furnaces . You must install, operate, and maintain a capture system that collects the emissio ns from each***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 175 of 225 electric arc furnace (including charging, melting, and tapping operations and emissions from any vent stacks) and conveys the collected emissions to a control device for the removal of the pollutants specified in the emissions standards specif ied in paragraphs (a)(1) through (a)(6) of this section
. (1) Particulate matter emissions
. (i) You must not discharge exhaust gases (including primary and tapping emissions) containing particulate matter in excess of 9. 3 milligrams per dry standard cubic meter (mg/dscm), corrected to 2 percent carbon dioxide (CO 2 ) into the atmosphere from any new or reconstructed electric arc furnace. This emission limit must be met by any furnace vent stacks. (ii) You must not discharge exhaust gases (including primary an d tapping emissions) containing particulate matter in excess of 24
mg /dscm, corrected to 2 percent carbon dioxide (CO 2 ) into the atmosphere from any existing electric arc furnace. This emission limit must be met by any furnace vent stacks. (2) Mercury emis sions . You must not discharge exhaust gases (including primary and tapping emissions) containing mercury emissions in excess of 16 μg/dscm, corrected to 2 percent CO 2 into the atmosphere from any new, reconstructed or existing electric arc furnace. (3) Pol ycyclic aromatic hydrocarbon emissions . You must not discharge exhaust gases (including primary and tapping emissions)***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 176 of 225 containing polycyclic aromatic hydrocarbon emissions in excess of 89 μg/dscm, corrected to 2 percent CO 2 into the atmosphere from any new , reconstructed or existing electric arc furnace. (4) Hydrochloric acid emissions . You must not discharge exhaust gases (including primary and tapping emissions) containing hydrochloric acid emissions in excess of 809 μg/dscm, corrected to 2 percent CO 2 in to the atmosphere from any new, reconstructed or existing electric arc furnace. (5) Hydrofluoric acid emissions . You must not discharge exhaust gases (including primary and tapping emissions) containing hydrofluoric acid emissions in excess of 801 μg/dscm , corrected to 2 percent CO 2 into the atmosphere from any new, reconstructed, or existing electric arc furnace. (6) Formaldehyde emissions . You must not discharge exhaust gases (including primary and tapping emissions) containing formaldehyde emissions in excess of 201 μg/dscm, corrected to 2 percent CO 2 into the atmosphere from any new, reconstructed or existing electric arc furnace. (b) Process fugitive emissions
. (1) You must install, operate, and maintain a capture system that collects all of the proce ss fugitive emissions from the shop building (including tapping, casting, ladle treatment and crushing and screening equipment process fugitives) at a negative pressure of at least 0.007 inches of water, and conveys the collected emissions***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 177 of 225 to a control dev ice. You must not discharge into the atmosphere emissions from the control device containing particulate matter in excess of 24 mg /dscm, corrected to 2 percent CO 2 . (2) You must not cause emissions exiting from a shop building, to exceed 10 percent opacity for more than one 6

- minute period. (3) As an alternative to meeting the requirements specified in paragraph (b)(1) of this section, you can elect to demonstrate compliance by meeting the requirements of paragraphs (b)(3)(i) through (b)(3)(iii) of this sec tion. (i) You must install compliance monitors on or near the plant boundary, at locations approved by the Administrator, to demonstrate that the manganese concentration in air is at all times maintained below a 10

- sample rolling average value of 0.10 μ g/m 3 at each monitor. (A) Samples must be collected every 6 days. All samples are 24

- hr integrated samples. (B) Calculate a 10

- sample rolling average to demonstrate compliance with the action level specified in paragraph (b)(3)(i) of this section. Missed or i nvalidated samples must be made up only on the established site

- specific 1

- in 6

- day schedule to include the required number of makeup samples to achieve a minimum of 10 valid samples). (C) Collect particles in the PM10 size fraction at a set flow rate of 16.7 l/minute using a 47 mm Teflon filter.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 178 of 225 (D) Conduct the analysis using an EPA method (such as compendium method IO

- 3.5) and ensure the manganese method detection limit (MDL) is no greater than 0.01 μg/m 3

. (E) All data, to include values below MDL, must be reported. Under no circumstances are data value substitutions (e.g., 1⁄2 MDL) acceptable
. (ii) (A) The monitoring system must include at least two ambient monitors and at least one of these monitors must be in a location that is expected to have the hig hest air concentrations at or near the facility boundary based on ambient dispersion modeling or other methods approved by the Administrator. (B) You must submit a written plan describing and explaining the basis for the design and adequacy of the complian ce monitoring network, the sampling, analytical and quality assurance procedures and the justification for any data adjustments within 45 days after the effective date of this subpart. (C) The Administrator at any time may require changes in or expansion o f, the monitoring program, including additional sampling and more frequent sampling, or revisions to the analytical protocols and network design. (iii) Upon the first exceedance of a 10

- sample rolling average, the source would be required within 6 months t o evaluate the capture and control of process fugitives from the furnace building and implement any changes indicated to reduce process fugitives to***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 179 of 225 acceptable levels. Upon a next exceedance of the 10

- sample rolling average following the 6

- month implementa tion period, the source would be required to comply with the requirement to enclose the furnace building(s) and evacuate the emissions to a control device(s). In this case, the source would be required to complete the enclosure within 1 year from the time the next exceedance occurs. (c) Local ventilation emissions . If you operate local ventilation to capture tapping, casting, or ladle treatment emissions and direct them to a control device other than one associated with the electric arc furnace, you must no t discharge into the atmosphere any captured emissions containing particulate matter in excess of 24
mg /dscm, corrected to 2 percent CO2. (d) MOR process . You must not discharge into the atmosphere from any new, reconstructed or existing MOR process exhaus t gases containing particulate matter in excess of 1.5 mg/dscm, correct to 2 percent CO2. (e) Crushing and screening equipment . You must not discharge into the atmosphere from any new, reconstructed, or existing piece of equipment associated with crushing and screening exhaust gases containing particulate matter in excess of 13 mg/dscm. (f) Emissions Averaging Option
. (1) As an alternative to meeting the emission standards specified in paragraphs (a)(1) through (a)(6) of this section on an electric arc fur nace - specific basis, and if you have more than one***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 180 of 225 existing electric arc furnace located at one or more contiguous properties, which are under common control of the same person (or persons under common control), you may demonstrate compliance by emission a veraging among the existing electric arc furnaces, if your averaged emissions for such electric arc furnaces are equal to or less than the applicable emission limit. (2) As an alternative to meeting the emission standard specified in paragraph (b)(1) of th is section on a building ventilation control device

- specific basis, and if you have more than one existing building ventilation control device located at one or more contiguous properties, which are under common control of the same person (or persons under common control), you may demonstrate compliance by emission averaging among the existing building ventilation control devices, if your averaged emissions for such building ventilation control devices are equal to or less than the applicable emission limit
. (3) As an alternative to meeting the emission standard specified in paragraph (e) of this section on a crushing and screening equipment control device

- specific basis, and if you have more than one existing crushing and screening equipment control device located at one or more contiguous properties, which are under common control of the same person (or persons under common control), you may demonstrate compliance by emission averaging among the existing crushing or screening equipment control device, if yo ur averaged***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 181 of 225 emissions for such crushing or screening equipment control devices are equal to or less than the applicable emission limit. (g) The averaged emissions rate from the existing equipment specified in paragraph (f) of this section participating in the emissions averaging option must be in compliance with the emission standards specified in paragraph (a)(1) of this section the compliance date specified in § 63.1621 . You must develop, and submit to the applicable regulatory authority for review and app roval upon request, an implementation plan for emission averaging according to the following procedures and requirements in paragraphs (g)(1) through (g)(4) of this section. (1) You must submit the implementation plan no later than 180 days before the date that the facility intends to demonstrate compliance using the emission averaging option. (2) You must include the information contained in paragraphs (g)(2)(i) through (g)(2)(vii) of this section in your implementation plan for all emission sources includ ed in an emissions average: (i) The identification of all existing equipment specified in paragraph (f) of this section in the applicable averaging group, including for each either the applicable HAP emission level or the control technology installed as of [DATE 60 DAYS AFTER EFFECTIVE DATE OF THE FINAL RULE] and the date on which you are requesting emission averaging to commence;***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 182 of 225 (ii) A description of how you will comply with the monitoring procedures specified in § 63.1626 for each averaging group; (iii) The specific control technology to be used for each piece of equipment specified in paragraph (f) of this section in the averaging group and the date of its installation or application; (iv) The test plan for the measurement of particulate matter, hydroch loric acid, hydrofluoric acid, formaldehyde and mercury emissions, as applicable, in accordance with the requirements in § 63.1625 and the planned test dates to ensure that averaged units are tested concurrently or with minimal differences in the dates test ing will occur; (v) The operating parameters to be monitored for each control system or device consistent with § 63.1626 and a description of how the operating limits will be determined; (vi) If you request to monitor an alternative operating parameter purs uant to §63.8, you must also include: (A) A description of the parameter(s) to be monitored and an explanation of the criteria used to select the parameter(s); and (B) A description of the methods and procedures that will be used to demonstrate that the pa rameter indicates proper operation of the control device; the frequency and content of monitoring, reporting, and recordkeeping requirements; and a demonstration, to the satisfaction of the applicable regulatory authority, that the***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 183 of 225 proposed monitoring freq uency is sufficient to represent control device operating conditions; and (vii) A demonstration that compliance with each of the applicable emission limit(s) will be achieved under representative operating conditions. (3) The regulatory authority shall rev iew and approve or disapprove the plan according to the following criteria: (i) Whether the content of the plan includes all of the information specified in paragraph (g)(2) of this section; and (ii) Whether the plan presents sufficient information to dete rmine that compliance will be achieved and maintained. (4) The applicable regulatory authority shall not approve an emission averaging implementation plan containing any of the following provisions: (i) Any averaging between emissions of differing pollutan ts or between differing sources; or (ii) The inclusion of any emission source other than an existing unit in the same source category. (h) At all times, you must operate and maintain any affected source, including associated air pollution control equipment and monitoring equipment, in a manner consistent with safety and good air pollution control practices for minimizing emissions. Determination of whether such operation and maintenance procedures are being used will be based on information available to the Administrator that may***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 184 of 225 include, but is not limited to, monitoring results, review of operation and maintenance procedures, review of operation and maintenance records, and inspection of the source. 7. Section 63.1624 is added to read as follows: § 63.1624 What are the operational and work practice standards for new, reconstructed and existing facilities? (a) Process fugitives sources
. (1) If you are complying with the standard specified in § 63.1623 (b)(1), you must prepare and operate according to a process fugitives ventilation plan for each shop building. (2) You must prepare a process fugitives ventilation schematic for each shop building indicating duct size and location, enclosure and hood sizes and locations, control device types, size and locations, an d exhaust locations should be developed. The process fugitives ventilation system schematic must be annotated with the location and size of each shop building air supply unit and each shop building exhaust fan. (3) You must conduct a baseline survey to est ablish actual air flow and static pressure values before and after each emission control device and in each branch of the process ventilation system after each enclosure or hood. You must also determine actual air flow and static pressure values for each s hop building air supply and exhaust device. You must demonstrate that air supply and exhaust are balanced.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 185 of 225 (4) You must repeat the baseline survey should at least every 5 years or following significant ventilation system changes. (5) The process fugitives ventilation plan must contain a description of each enclosure and hood with explanation demonstrating that adequate control of the process source is being achieved or actions planned to improve performance. (6) The process fugitives ventilation plan must be adequate to ensure that the building is continuously maintained at a negative pressure of at least 0.007 inches of water. (7) The process fugitives ventilation plan must identify critical maintenance actions, schedule to complete, and verification

recor d of completion. (8) You must submit a copy of the process fugitives ventilation plan to the designated permitting authority on or before the applicable compliance date for the affected source as specified in § 63.1621 . The requirement for you to operate th e facility according to a written process fugitives ventilation plan must be incorporated in the operating permit for the facility that is issued by the designated permitting authority under part 70 of this chapter. (b) Outdoor fugitive dust sources
. (1) You must prepare, and at all times operate according to, an outdoor fugitive dust control plan that describes in detail the measures that will be put in place to control outdoor fugitive dust emissions from the individual fugitive dust sources at the facil ity.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 186 of 225 (2) You must submit a copy of the outdoor fugitive dust control plan to the designated permitting authority on or before the applicable compliance date for the affected source as specified in § 63.1621 (a). The requirement for you to operate the facilit y according to a written outdoor fugitive dust control plan must be incorporated in the operating permit for the facility that is issued by the designated permitting authority under part 70 of this chapter. (3) You are permitted to use existing manuals tha t describe the measures in place to control outdoor fugitive dust sources required as part of a State implementation plan or other federally enforceable requirement for particulate matter to satisfy the requirements of paragraph (b)(1) of this section. 8. Section 63.1625 is added to read as follows: § 63.1625 What are the performance test and compliance requirements for new, reconstructed and existing facilities? (a) Performance testing
. (1) All performance tests must be conducted according to the requireme nts in §63.7 of subpart A. (2) Each performance test must consist of three separate and complete runs using the applicable test methods. (3) Each run must be conducted under conditions that are representative of normal process operations. (4) Performance t ests conducted on air pollution control devices serving electric arc furnaces must be conducted such that at least***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 187 of 225 one tapping period, or at least 20 minutes of a tapping period, whichever is less, is included in at least two of the three runs. The samplin g time for each run must be at least as long as three times the average tapping period of the tested furnace, but no less than 60 minutes. (5) You must conduct the performance tests specified in paragraph (c) of this section under such conditions as the Ad ministrator specifies based on representative performance of the affected source for the period being tested. Upon request, you must make available to the Administrator such records as may be necessary to determine the conditions of performance tests. (b) Test methods. The following test methods in a ppendi ces of part 60 or 63 of this chapter or as specified elsewhere must be used to determine compliance with the emission standards. (1) Method 1 of Appendix A

- 1 of 40 CFR part 60 to select the sampling port l ocation and the number of traverse points. (2) Method 2 of Appendix A

- 1 of 40 CFR part 60 to determine the volumetric flow rate of the stack gas. (3)(i) Method 3A or 3B of Appendix A

- 1 of 40 CFR part 60 (with integrated bag sampling) to determine the outle t stack and inlet oxygen and CO2 content. (ii) You must measure CO2 concentrations at both the inlet and outlet of the positive pressure fabric filter in conjunction with the***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 188 of 225 pollutant sampling in order to correct pollutant concentrations for dilution and to determine isokinetic sampling rates. (4) Method 4 of Appendix A

- 1 of 40 CFR part 60 to determine the moisture content of the stack gas. (5)(i) Method 5 of Appendix A

- 1 of 40 CFR part 60 to determine the particulate matter concentration of the stack gas for negative pressure baghouses and positive pressure baghouses with stacks. (ii) Method 5D of Appendix A

- 1 of 40 CFR part 60 to determine particulate matter concentration and volumetric flow rate of the stack gas for positive pressure baghouses without st acks. (iii) The sample volume for each run must be a minimum of 4.0 cubic meters (141.2 cubic feet). For Method 5 testing only, you may choose to collect less than 4.0 cubic meters per run provided that the filterable mass collected (e.g., net filter mass plus mass of nozzle, probe and filter holder rinses) is equal to or greater than 10 mg. If the total mass collected for two of three of the runs is less than 10 mg, you must conduct at least one additional test run that produces at least 10 mg of filterabl e mass collected (i.e., at a greater sample volume). Report the results of all test runs. (6) Method 30B of Appendix A

- 1 of 40 CFR part 60 to measure mercury. Apply the minimum sample volume determination procedures as per the method.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 189 of 225 (7)(i) Method 26A of Appendix A

- 1 of 40 CFR part 60 to determine outlet stack or inlet hydrochloric acid and hydrofluoric acid concentration. (ii) Collect a minimum volume of 2 cubic meters. (8)(i) Method 316 of Appendix A

- 1 of 40 CFR part 60 to determine outlet stack or inlet formaldehyde. (ii) Collect a minimum volume of 1.0 cubic meter. (9)(i)Method 10 of Appendix A

- 1 of 40 CFR part 60 to determine inlet carbon monoxide concentration. (ii) Collect one 1

- hour test run corresponding (e.g., overlapping in time) to each of the t hree formaldehyde test runs. (10) Method 9 of Appendix A

- 1 of 40 CFR part 60 to determine opacity. (11) Methods to determine the mercury content of manganese ore including a total metals digestion technique, SW

- 846 Method 3052, and a mercury specific analy sis method, SW

- 846 Method 7471b (Cold Vapor AA) or Water Method 1631E (Cold Vapor Atomic Fluorescence). (12) California Air Resources Board (CARB) Method 429, Determination of Polycyclic Aromatic Hydrocarbon (PAH) Emissions from Stationary Sources to deter mine total PAH emissions. The method is available from California Resources Board, 1102 Q Street, Sacramento, California 95814, ( http://www.arb.ca.gov/testmeth/vol3/M_429.pdf ). (13) The owner or operator may use alternative measurement methods***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 190 of 225 approved by the Administrator following the procedures described in §63.7(f) of subpart A. (c) Compliance demonstration with the emission standards
. (1) You must conduct an initial performance test for air pollution control devices or vent stacks subject to § 63.1623 (a) through (e) to demonstrate compliance with the applicable emission standards. (2) You must conduct performance tests every 5 years for the air pollution control devices and vent stacks associa ted with the electric arc furnaces and furnace building ventilation systems. The results of these periodic tests will be used to demonstrate compliance with the emission standards in § 63.1623 (a)(1) through (a)(6), (b)(1) and (b)(2), as applicable. (3) For any air pollution control device that serves tapping emissions combined with non

- furnace emissions, such as the MOR process, or equipment associated with crushing and screening, casting or ladle treatment, you must conduct a performance test at least
every 5 years. The results of these tests will be used to demonstrate compliance with the emission standards in § 63.1623 (c) through (e), as applicable. (4) Compliance is demonstrated for all sources performing emissions tests if the average concentration for th e three runs comprising the performance test does not exceed the standard or if***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 191 of 225 you successfully comply with the emission averaging option specified in § 63.1623 (f). (5) Operating Limits . You must establish parameter operating limits according to paragraphs (c)(5)(i) through (c)(5)(vi) of this section. Unless otherwise specified, compliance with each established operating limit shall be demonstrated for each 24

- hour operating day. (i) For a wet particulate matter scrubber, you must establish the minimum liqu id flow rate and pressure drop as your operating limits during the three

- run performance test. If you use a wet particulate matter scrubber and you conduct separate performance tests for particulate matter, you must establish one set of minimum liquid flow rate and pressure drop operating limits. If you conduct multiple performance tests, you must set the minimum liquid flow rate and pressure drop operating limits at the highest minimum hourly average values established during the performance tests. (ii) Fo r a wet acid gas scrubber, you must establish the minimum liquid flow rate and pH, as your operating limits during the three

run performance test. If you use a wet acid gas scrubber and you conduct separate performance tests for hydrochloric acid or hydrof luoric acid, you must establish one set of minimum liquid flow rate and pH operating limits. If you conduct multiple performance tests, you must set the minimum liquid flow rate and pH operating limits at the highest minimum hourly average values establish ed during the performance tests.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 192 of 225 (iii) For a dry scrubber, dry sorbent injection (DSI) system or activated carbon injection system, you must establish the minimum hourly average sorbent or activated carbon injection rate, as measured during the three

- run p erformance test as your operating limit. (iv) For emission sources with fabric filters that choose to demonstrate continuous compliance through bag leak detection systems you must install a bag leak detection system according to the requirements in § 63.162 6 (d), and you must set your operating limit such that the sum duration of bag leak detection system alarms does not exceed 5 percent of the process operating time during a 6

- month period. (v) If you choose to demonstrate continuous compliance through a
par ticulate matter CEMS, you must determine an operating limit (particulate matter concentration in mg/dscm) during performance testing for initial particulate matter compliance. The operating limit will be the average of the PM filterable results of the thre e Method 5 or Method 5D of Appendix A

- 1 of 40 CFR part 60 performance test runs. To determine continuous compliance, the hourly average PM concentrations will be averaged on a rolling 30 operating day basis. Each 30 operating day average would have to meet the PM operating limit. (v) For any furnace stack, you must establish a weighted average mercury concentration of the manganese ore being used in the furnace***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 193 of 225 during the emission test. Collect a sample of all ores used in the furnace and prepare a weighted average based on the relative mass of each type of ore used in the furnace charge. (d) Compliance demonstration with shop building opacity standards
. (1)(i) If you are subject to § 63.1623 (b)(2), you must conduct initial opacity observations of the shop bu ilding to demonstrate compliance with the applicable opacity standards according to §63.6(h)(5), which addresses the conduct of opacity or visible emission observations. (ii) You must conduct the opacity observations according to EPA Method 9 of 40 CFR par t 60, Appendix A

- 4, for a minimum of 60 minutes to include at least 20 minutes of a tapping period, or at least 20 minutes of a tapping period, whichever is less, in at least two of the three runs to coincide with each performance test run of the associate d control device.. (iii) Repeat this opacity observation at least every 5 years during the periodic performance tests required pursuant to paragraphs (c)(2) of this section
. (2)(i) When demonstrating initial compliance with the shop building opacity standa rd, as required by paragraph (d)(1) of this section, you must simultaneously establish parameter values for one of the following: the capture system fan motor amperes and all capture system damper positions, the total volumetric flow rate to***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 194 of 225 the air pollut ion control device and all capture system damper positions, or volumetric flow rate through each separately ducted hood that comprises the capture system. (ii) You may petition the Administrator to reestablish these parameters whenever you can demonstrate to the Administrator's satisfaction that the electric arc furnace operating conditions upon which the parameters were previously established are no longer applicable. The values of these parameters determined during the most recent demonstration of complia nce must be maintained at the appropriate level for each applicable period. (iii) You will demonstrate compliance by installing, operating, and maintaining a digital differential pressure device that shows you are maintaining the shop building under negati ve pressure to at least 0.007 inches of water. (3) You will demonstrate continuing compliance with the opacity standards by following the monitoring requirements specified in § 63.1626 (h) and the reporting and recordkeeping requirements specified in § 63.162 9 xx. (e) Compliance demonstration with the operational and work practice standards (1) Process fugitives sources . You will demonstrate compliance by developing and maintaining a process fugitives ventilation plan, by reporting any deviations from the plan and by taking necessary corrective actions to correct deviations or deficiencies.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 195 of 225 (2) Outdoor fugitive dust sources . You will demonstrate compliance by developing and maintaining an outdoor fugitive dust control plan, by reporting any deviations from the plan and by taking necessary corrective actions to correct deviations or deficiencies. (3) Baghouses equipped with bag leak detection systems . You will demonstrate compliance with the bag leak detection system requirements by developing analysis and suppor ting documentation demonstrating conformance with EPA guidance and specifications for bag leak detection systems in §60.57c(h). 9. Section 63.1626 is added to read as follows: § 63.1626 What m onitoring requirements must I meet? . (a) Baghouse Monitoring . You must prepare, and at all times operate according to, a standard operating procedures manual that describes in detail procedures for inspection, maintenance, and bag leak detection and corrective action plans for all baghouses (fabric filters or cartridge filters) that are used to control process vents, process fugitive, or outdoor fugitive dust emissions from any source subject to the emissions standards in § 63.1623 , including those used to control emissions from building ventilation. (b) You must submit the standard operating procedures manual for baghouses required by paragraph (a) of this section to the Administrator or delegated authority for review and approval. (c) Unless the baghouse is equipped with a bag leak detection system, the procedures that you specify in the standard operating***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 196 of 225 procedures manual for inspections and routine maintenance must, at a minimum, include the requirements of paragraphs (c)(1) and (c)(2) of this section. (1) You must observe the baghouse outlet on a daily basis for the presence of any visible emissions. (2) In addition to the daily visible emissions observation, you must conduct the following activities: (i) Weekly confirmation that dust is being removed from hoppers through visual inspection, or equivalent means of ensu ring the proper functioning of removal mechanisms. (ii) Daily check of compressed air supply for pulse

- jet baghouses. (iii) An appropriate methodology for monitoring cleaning cycles to ensure proper operation. (iv) Monthly check of bag cleaning mechanisms for proper functioning through visual inspection or equivalent means. (v) Quarterly visual check of bag tension on reverse air and shaker

- type baghouses to ensure that the bags are not kinked (kneed or bent) or lying on their sides. Such checks are not req uired for shaker

- type baghouses using self

- tensioning (spring loaded) devices. (vi) Quarterly confirmation of the physical integrity of the baghouse structure through visual inspection of the baghouse interior for air leaks.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 197 of 225 (vii) Semiannual inspection of fans for wear, material buildup, and corrosion through visual inspection, vibration detectors, or equivalent means. (d) Bag leak detection system
. (1) For each baghouse used to control emissions from an electric arc furnace or building ventilation system, you must install, operate, and maintain a bag leak detection system according to paragraphs (d)(2) through (d)(4) of this section, unless a system meeting the requirements of paragraph (i) of this section, for a CEMS and continuous emissions rate monitori ng system, is installed for monitoring the concentration of particulate matter. You may choose to install, operate and maintain a bag leak detection system for any other baghouse in operation at the facility according to paragraphs (d)(2) through (d)(4) of this section. (2) The procedures you specified in the standard operating procedures manual for baghouse maintenance must include, at a minimum, a preventative maintenance schedule that is consistent with the baghouse manufacturer's instructions for routin e and long

- term maintenance. (3) Each bag leak detection system must meet the specifications and requirements in paragraphs (d)(3)(i) through (d)(3)(viii) of this section. (i) The bag leak detection system must be certified by the manufacturer to be capabl e of detecting PM emissions at***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 198 of 225 concentrations of 1.0 milligram per dry standard cubic meter (0.00044 grains per actual cubic foot) or less. (ii) The bag leak detection system sensor must provide output of relative PM loadings. (iii) The bag leak detection system must be equipped with an alarm system that will alarm when an increase in relative particulate loadings is detected over a preset level. (iv) You must install and operate the bag leak detection system in a manner consistent with the guidance provid ed in ―Office of Air quality Planning and Standards (OAQPS) Fabric Filter Bag Leak Detection Guidance‖ EPA

- 454/R

- 98

- 015, September 1997 (incorporated by reference) and the manufacturer's written specifications and recommendations for installation, operatio n, and adjustment of the system. (v) The initial adjustment of the system must, 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. (vi) Following initial adjustment, you must not adjust the sensitivity or range, averaging period, alarm set points, or alarm delay time, except as detailed in the approved standard operating procedures manual required under paragrap h (a) of this section. You cannot increase the sensitivity by more than 100 percent or decrease the sensitivity by more than 50 percent over a 365

- day period unless***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 199 of 225 such adjustment follows a complete baghouse inspection that demonstrates that the baghouse is in good operating condition. (vii) You must install the bag leak detector downstream of the baghouse. (viii) Where multiple detectors are required, the system's instrumentation and alarm may be shared among detectors. (vii) You must install the bag leak detection sensor downstream of the fabric filter. (viii) Where multiple detectors are required, the system‘s instrumentation and alarm may be shared among detectors. (4) You must include in the standard operating procedures manual required by paragraph (a ) of this section a corrective action plan that specifies the procedures to be followed in the case of a bag leak detection system alarm. The corrective action plan must include, at a minimum, the procedures that you will use to determine and record the ti me and cause of the alarm as well as the corrective actions taken to minimize emissions as specified in paragraphs (d)(4)(i) and (d)(4)(ii) of this section. (i) The procedures used to determine the cause of the alarm must be initiated within 30 minutes of the alarm. (ii) The cause of the alarm must be alleviated by taking the necessary corrective action(s) that may include, but not be limited to, those listed in paragraphs (d)(4)(i)(A) through (d)(4)(i)(F) of this section.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 200 of 225 (A) Inspecting the baghouse for ai r leaks, torn or broken filter elements, or any other malfunction that may cause an increase in emissions. (B) Sealing off defective bags or filter media. (C) Replacing defective bags or filter media, or otherwise repairing the control device. (D) Sealing off a defective baghouse compartment. (E) Cleaning the bag leak detection system probe, or otherwise repairing the bag leak detection system. (F) Shutting down the process producing the particulate emissions. (e) If you use a wet particulate matter scrubbe r, you must collect the pressure drop and liquid flow rate monitoring system data according to § 63.1626 , reduce the data to 24

- hour block averages and maintain the 24

- hour average pressure drop and liquid flow

- rate at or above the operating limits establis hed during the performance test according to § 63.1625 (c)(5)(i). (f) Reserved (g) If you use a dry scrubber, DSI sorbent injection or carbon injection, you must collect the sorbent or carbon injection rate monitoring system data for the dry scrubber, DSI or ACI according to § 63.1626 , reducing the data to 24

- hour block averages; and maintain the 24

- hour average sorbent or carbon injection rate at or above the***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 201 of 225 operating limit established during the performance test according to § 63.1625 (c)(5)(iii). (h) Shop b uilding opacity . In order to demonstrate continuous compliance with the opacity standards in § 63.1623 , you must comply with one of the monitoring options in paragraphs (h)(1), (h)(2), (h)(3) or (h)(8) of this section. The selected option must be consistent with that selected during the initial performance test described in § 63.1625 (d)(2). Alternatively, you may use the provisions of §63.8(f) to request approval to use an alternative monitoring method. (1) You must check and record the control system fan mot or amperes and capture system damper positions once per shift. (2) You must install, calibrate, and maintain a monitoring device that continuously records the volumetric flow rate through each separately ducted hood. (3) You must install, calibrate, and ma intain a monitoring device that continuously records the volumetric flow rate at the inlet of the air pollution control device and check and record the capture system damper positions once per shift. (4) The flow rate monitoring devices must meet the follo wing requirements: (i) Be installed in an appropriate location in the exhaust duct such that reproducible flow rate monitoring will result.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 202 of 225 (ii) Have an accuracy ±10 percent over its normal operating range and be calibrated according to the manufacturer's instructions. (5) The Administrator may require you to demonstrate the accuracy of the monitoring device(s) relative to Methods 1 and 2 of Appendix A of part 60 of this chapter. (6) Failure to maintain the appropriate capture system parameters (fan motor a mperes, flow rate, and/or damper positions) establishes the need to initiate corrective action as soon as practicable after the monitoring excursion in order to minimize excess emissions. (7) You must install, operate, and maintain a digital differential p ressure monitoring system to continuously monitor each total enclosure as described in paragraphs (h)(7)(i) through (h)(7)(v) of this section. (i) You must install and maintain a minimum of one building digital differential pressure monitoring system at ea ch of the following three walls in the shop building: (A) The leeward wall. (B) The windward wall. (C) An exterior wall that connects the leeward and windward wall at a location defined by the intersection of a perpendicular line between a point on the co nnecting wall and a point on its furthest opposite exterior wall, and intersecting within plus or minus ten meters of the midpoint of a straight line between the two***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 203 of 225 other monitors specified. The midpoint monitor must not be located on the same wall as eit her of the other two monitors. (ii) The digital differential pressure monitoring systems must be certified by the manufacturer to be capable of measuring and displaying negative pressure in the range of 0.01 to 0.2 mm mercury (0.005 to 0.11 inches of water ) with a minimum accuracy of plus or minus 0.001 mm mercury (0.0005 inches of water). (iii) You must equip each digital differential pressure monitoring system with a continuous recorder. (iv) You must calibrate each digital differential pressure monitor ing system in accordance with manufacturer‘s specifications at least once every 12 calendar months or more frequently if recommended by the manufacturer. (v) You must equip the digital differential pressure monitoring system with a backup, uninterruptible power supply to ensure continuous operation of the monitoring system during a power outage. (8) If you comply with the requirements specified in § 63.1623 (b)(3), you must install, operate and maintain a continuous monitoring system for the measurement of ma nganese concentrations in air as specified in paragraphs (h)(8)(i) through (h)(8)((v) of this section. (i) You must operate a minimum of two compliance monitors sufficient in location and frequency of sample collection to detect expected maximum concentra tions of manganese in air due to emissions***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 204 of 225 from the affected source(s) in accordance with a written plan as described in paragraph (h)(8)(ii) of this section and approved by the Administrator. The plan must include descriptions of the sampling and analytic al methods used. At least one 24

- hour sample must be collected from each monitor every 6 days except during periods or seasons exempted by the Administrator. All records pertaining to the implementation and results of the compliance monitoring shall be kep t

on - site for a period of no less than 5 years from the date of generation of the record. (ii) You must submit a written plan describing and explaining the basis for the design and adequacy of the compliance monitoring network, the sampling, sample handli ng and custody, analytical procedures, quality assurance procedures, recordkeeping procedures and any other related procedures, and the justification for any seasonal, background, or other data adjustments within [45 DAYS AFTER
EFFECTIVE DATE OF FINAL RULE ]. (iii) The Administrator at any time may require changes in, or expansion of, the monitoring program, including additional sampling and, more frequent sampling, revisions to the analytical protocols and network design. (iv) If all rolling 10

- sample avera ge concentrations of manganese in air measured by the compliance monitoring system are less than 50 percent of the manganese concentration limits specified in § 63.1623 (b)(3)(i) for 3 consecutive years, you may submit a***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 205 of 225 proposed revised plan to reduce the m onitoring sampling and analysis frequency to the Administrator for review. If approved by the Administrator, you may adjust your monitoring accordingly. (v) For any subsequent period, if any rolling 10

- sample average manganese concentration in air measured at any monitor in the monitoring system exceeds 50 percent of the concentration limits specified in § 63.1623 (b)(3), you must resume monitoring pursuant to paragraph (h)(8)(i)(A) of this section at all monitors until another 3 consecutive years of manganes e concentration measurements is demonstrated to be less than 50 percent of the manganese concentration limits specified in § 63.1623 (b)(3). (i) Furnace Capture System . You must perform monthly inspections of the equipment that is important to the performanc e of the furnace capture system, including capture of both primary and tapping emissions This inspection must include an examination of the physical condition of the equipment ( e.g. , has hood location been changed or obstructed because of contact with cran es or ladles), suitable for detecting holes in ductwork or hoods, flow constrictions in ductwork due to dents or accumulated dust, and operational status of flow rate controllers (pressure sensors, dampers, damper switches, etc.). Any deficiencies must be recorded and proper maintenance and repairs performed. (j) Requirements for sources using CMS . If you demonstrate compliance with any applicable emissions limit through use of a***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 206 of 225 continuous monitoring system (CMS), where a CMS includes a continuous paramete r monitoring system (CPMS) as well as a continuous emissions monitoring system (CEMS), you must develop a site

- specific monitoring plan and submit this site

- specific monitoring plan, if requested, at least 60 days before your initial performance evaluation (where applicable) of your CMS. Your site

- specific monitoring plan must address the monitoring system design, data collection, and the quality assurance and quality control elements outlined in this section and in §63.8(d). You must install, operate, and maintain each CMS according to the procedures in your approved site

- specific monitoring plan. Using the process described in §63.8(f)(4), you may request approval of monitoring system quality assurance and quality control procedures alternative to those sp ecified in paragraphs (j)(1) through (j)(6) of this section in your site

- specific monitoring plan. (1) The performance criteria and design specifications for the monitoring system equipment, including the sample interface, detector signal analyzer and data acquisition and calculations; (2) Sampling interface location such that the monitoring system will provide representative measurements; (3) Equipment performance checks, system accuracy audits, or other audit procedures; (4) Ongoing operation and mainten ance procedures in accordance with the general requirements of §63.8(c)(1) and (c)(3); and***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 207 of 225 (5) Conditions that define a continuous monitoring system that is out of control consistent with §63.8(c)(7)(i) and for responding to out of control periods consist ent with §63.8(c)(7)(ii) and (c)(8) or Appendix A to this subpart, as applicable. (6) Ongoing recordkeeping and reporting procedures in accordance with provisions in §63.10(c), (e)(1) and (e)(2)(i) and Appendix A to this subpart, as applicable. (k) If you have an operating limit that requires the use of a CPMS, you must install, operate, and maintain each continuous parameter monitoring system according to the procedures in paragraphs (k)(1) through (k)(7) of this section. (1) The continuous parameter monit oring system must complete a minimum of one cycle of operation for each successive 15

- minute period. You must have a minimum of four successive cycles of operation to have a valid hour of data. (2) Except for periods of monitoring system malfunctions,
repa irs associated with monitoring system malfunctions, and required monitoring system quality assurance or quality control activities (including, as applicable, system accuracy audits and required zero and span adjustments) , you must operate the CMS at all ti mes the affected source is operating. A monitoring system malfunction is any sudden, infrequent, not reasonably preventable failure of the monitoring system to provide valid data. Monitoring system failures that are caused in part by poor maintenance or ca reless operation are***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 208 of 225 not malfunctions. You are required to complete monitoring system repairs in response to monitoring system malfunctions and to return the monitoring system to operation as expeditiously as practicable
. (3) You may not use data recorded during monitoring system malfunctions, repairs associated with monitoring system malfunctions, or required monitoring system quality assurance or control activities in calculations used to report emissions or operating levels. You must use all the data co llected during all other required data collection periods in assessing the operation of the control device and associated control system. (4) Except for periods of monitoring system malfunctions, repairs associated with monitoring system malfunctions , and required quality monitoring system quality assurance or quality control activities (including, as applicable, system accuracy audits and required zero and span adjustments), failure to collect required data is a deviation of the monitoring requirements. ( 5) You must conduct other CPMS equipment performance checks, system accuracy audits, or other audit procedures specified in your site

- specific monitoring plan at least once every 12 months. (6) You must conduct a performance evaluation of each CPMS in

acco rdance with your site

- specific monitoring plan. (7) You must record the results of each inspection, calibration, and validation check. (l) For a CPMS for measuring gaseous flow:***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 209 of 225 (1) Use a flow sensor with a measurement sensitivity of 5 percent of the flow rate or 10 cubic feet per minute, whichever is greater, (2) Check all mechanical connections for leakage at least every month, and (3) Perform a visual inspection at least every 3 months of all components of the flow CPMS for physical and operational inte grity and all electrical connections for oxidation and galvanic corrosion if your flow CPMS is not equipped with a redundant flow sensor. (m) For a CPMS for measuring liquid flow: (1) Use a flow sensor with a measurement sensitivity of 2 percent of the fl ow rate and (2) Reduce swirling flow or abnormal velocity distributions due to upstream and downstream disturbances. (n) For a CPMS for measuring pressure: (1) Minimize or eliminate pulsating pressure, vibration, and internal and external corrosion and (2) Use a gauge with a minimum tolerance of 1.27 centimeters of water or a transducer with a minimum tolerance of 1 percent of the
pressure range. (3) Perform checks at least once each process operating day to ensure pressure measurements are not obstructed ( e.g. , check for pressure tap pluggage daily).***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 210 of 225 (o) For a CPMS measuring flow of sorbent or carbon ( e.g., weigh belt, weigh hopper, or hopper flow measurement device), install and calibrate the device in accordance with manufacturer's procedures and specifi cations. (p) For a CPMS for measuring pH: (1) E nsure the sample is properly mixed and representative of the fluid to be measured. (2) C heck the pH meter's calibration on at least two points every 8 hours of process operation. (q) Particulate Matter CEMS . I f you are using a CEMS to measure particulate matter emissions to meet requirements of this subpart, you must install, certify, operate, and maintain the particulate matter CEMS as specified in paragraphs (n)(1) through (n)(3) of this section. (1) You must conduct a performance evaluation of the PM CEMS according to the applicable requirements of §60.13, and Performance Specification 11 at 40 CFR part 60, Appendix B of this chapter. (2) During each PM correlation testing run of the CEMS required by Performa nce Specification 11 at 40 CFR part 60, Appendix B of this chapter, PM and oxygen (or carbon dioxide) collect data concurrently (or within a 30

- to 60

- minute period) by both the CEMS and by conducting performance tests using Method 5 or 5D at 40 CFR part 60 , Appendix A

– 3 or Method 17 at 40 CFR part 60, Appendix A

– 6 of this chapter.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 211 of 225 (3) Perform quarterly accuracy determinations and daily calibration drift tests in accordance with Procedure 2 at 40 CFR part 60, Appendix F of this chapter. Relative Response Aud its must be performed annually and Response Correlation Audits must be performed every 3 years. (4) Within 60 days after the date of completing each CEMS relative accuracy test audit or performance test conducted to demonstrate compliance with this subpart , you must submit the relative accuracy test audit data and performance test data to EPA by successfully submitting the data electronically into EPA‘s Central Data Exchange by using the Electronic Reporting Tool (see http://www.epa.gov/ttnchie1/ert/ ). (r) Ore Sampling Requirements
. (1) Following completion of the initial compliance demonstration where you established a weighted average mercury concentration of the manganese ore being used in the furnace during the emission test, you must determine the weig hted average mercury concentration of the manganese ores used in the process on a monthly basis. If you introduce a new type of ore, you must analyze the sample according the methods specified in § 63.1625 (b)(11) and factor the results into your updated wei ghted average mercury concentration. (2) If the weighted average mercury concentration is more than 10 percent higher than the weighted average operating limit, and you are operating an activated carbon injection system, you must reassess***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 212 of 225 the activated car bon injection rate and revise the rate according to procedures established in your CMS monitoring plan. (3) If the weighted average mercury concentration is more than 10 percent higher than the weighted average operating limit, and you are not operating an activated carbon injection system, you must retest the control device within 30 days to demonstrate compliance with the mercury emission limit and establish a new weighted average mercury concentration and associated activated carbon injection rate. 10. S ection 63.1627 is added to read as follows: § 63.1627 What is an affirmative defense for exceedence of an emission s limit during malfunction? In response to an action to enforce the standards set forth in paragraph § 63.1623 you may assert an affirmative de fense to a claim for civil penalties for exceedances of such standards that are caused by malfunction, as defined at 40 CFR 63.2. Appropriate penalties may be assessed, however, if the respondent fails to meet its burden of proving all of the requirements in the affirmative defense. The affirmative defense shall not be available for claims for injunctive relief. (a) Affirmative Defense . To establish the affirmative defense in any action to enforce such a limit, you must meet the notification requirements in paragraph (b) of this section, and must prove by a preponderance of evidence that: (1) The excess emissions:***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 213 of 225 (i) Were caused by a sudden, infrequent, and unavoidable failure of air pollution control and monitoring equipment, process equipment,
or a proces s to operate in a normal or usual manner; and (ii) Could not have been prevented through careful planning, proper design or better operation and maintenance practices; and (iii) Did not stem from any activity or event that could have been foreseen and avoi ded, or planned for; and (iv) Were not part of a recurring pattern indicative of inadequate design, operation, or maintenance; and (2) Repairs were made as expeditiously as possible when the applicable emission limitations were being exceeded. Off

- shift an d overtime labor were used, to the extent practicable to make these repairs; and (3) The frequency, amount and duration of the excess emissions (including any bypass) were minimized to the maximum extent practicable during periods of such emissions; and (4 ) If the excess emissions resulted from a bypass of control equipment or a process, then the bypass was unavoidable to prevent loss of life, personal injury, or severe property damage; and (5) All possible steps were taken to minimize the impact of the

exc ess emissions on ambient air quality, the environment and human health; and***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 214 of 225 (6) All emissions monitoring and control systems were kept in operation if at all possible, consistent with safety and good air pollution control practices; and (7) All of the acti ons in response to the excess emissions were documented by properly signed, contemporaneous operating logs; and (8) At all times, the facility was operated in a manner consistent with good practices for minimizing emissions; and (9) A written root cause an alysis has been prepared, the purpose of which is to determine, correct, and eliminate the primary causes of the malfunction and the excess emissions resulting from the malfunction event at issue. The analysis shall also specify, using best monitoring meth ods and engineering judgment, the amount of excess emissions that were the result of the malfunction. (b) Notification
. (1) If you experience an exceedence of the facilities‘ emission limit(s) during a malfunction, you must notify the EPA Administrator by telephone or facsimile (FAX) transmission as soon as possible, but no later than two (2) business days after the initial occurrence of the malfunction, if you wish to avail yourself of an affirmative defense to civil penalties for that malfunction. (2) Y ou must also submit a written report to the EPA Administrator, within 45 days of the initial occurrence of the exceedence of the standard in § 63.1623 , to demonstrate, with all***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 215 of 225 necessary supporting documentation, that you have met the requirements set fort h in paragraph (a) of this section. (3) You may seek an extension of this deadline for up to 30 additional days by submitting a written request to the Administrator before the expiration of the 45

- day period. Until a request for an extension has been appr oved by the Administrator, you are subject to the requirement to submit such report within 45 days of the initial occurrence of the exceedances. 11. Section 63.1628 is added to read as follows: § 63.1628 What notification requirements must I meet? (a) You m ust comply with all of the notification requirements of §63.9 of subpart A, General Provisions. Electronic notifications are encouraged when possible. (b)(1) You must submit the process fugitives ventilation plan required under § 63.1624 (a), the fugitives dust control plan required under § 63.1624 (b), the site

- specific monitoring plan for CMS required under § 63.1626 (j), the standard operating procedures manual for baghouses required under § 63.1626 (a) and the manganese monitoring alternative plan required und er § 63.1626 (h)(8) to the Administrator or delegated authority along with a notification that you are seeking review and approval of these plans and procedures. You must submit this notification no later than [ 1 YEAR AFTER EFFECTIVE DATE OF FINAL
RULE ]. For sources that commenced construction or reconstruction after [ EFFECTIVE DATE OF FINAL RULE ], you must submit this***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 216 of 225 notification no later than 180 days before startup of the constructed or reconstructed ferromanganese or silicomanganese production facility. For an affected source that has received a construction permit from the Administrator or delegated authority on or before [ EFFECTIVE DATE OF FINAL RULE ], you must submit this notification no later than [ 1 YEAR AFTER EFFECTIVE DATE OF FINAL RULE ]. (2) The p lans and procedures documents submitted as required under paragraph (b)(1) of this section must be submitted to the Administrator in electronic format for review and approval of the initial submittal and whenever an update is made to the procedure. 12. Sec tion 63.1629 is added to read as follows: § 63.1629 What recordkeeping and reporting requirements must I meet? (a) You must comply with all of the recordkeeping and reporting requirements specified in §63.10 of the General Provisions that are referenced in Table 1 to this subpart. (1) Records must be maintained in a form suitable and readily available for expeditious review, according to §63.10(b)(1). However, electronic recordkeeping and reporting is encouraged, and required for some records and reports. ( 2) Records must be kept on site for at least 2 years after the date of occurrence, measurement, maintenance, corrective action, report, or record, according to §63.10(b)(1).***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 217 of 225 (b) You must maintain, for a period of 5 years, records of the information listed in paragraphs (b)(1) through (b)(12) of this section. (1) Electronic records of the bag leak detection system output. (2) An identification of the date and time of all bag leak detection system alarms, the time that procedures to determine the cause of th e alarm were initiated, the cause of the alarm, an explanation of the corrective actions taken, and the date and time the cause of the alarm was corrected. (3) All records of inspections and maintenance activities required under § 63.1626 (a) as part of the practices described in the standard operating procedures manual for baghouses required under § 63.1626 (c). (4) Electronic records of the pressure drop and water flow rate values for wet scrubbers used to control particulate matter emissions as required in § 63.1626 (e) ,identification of periods when the 1

- hour average pressure drop and water flow rate values below the established minimum established and an explanation of the corrective actions taken. (5) Electronic records of the shop building capture system monitoring required under § 63.1626 (h)(1) through (h)(3), (h)(7) and (h)(8) , as applicable, identification of periods when the capture system parameters were not maintained or the manganese concentration***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 218 of 225 exceeded the rolling 10

- sample concentration level as required under § 63.1623 (b)(3) and an explanation of the corrective actions taken. (6) Records of the results of monthly inspections of the furnace capture system required under § 63.1626 (i). (7) Electronic records of the continuous flow monitors or
pres sure monitors required under § 63.1626 (j) and (k) and an identification of periods when the flow rate or pressure was not maintained as required in § 63.1626 (e). (8) Electronic records of the output of any CEMS installed to monitor particulate matter emissio ns meeting the requirements of § 63.1626 (j) (9) Records of the total sorbent injection rate required under § 63.1626 (k). (10) Records of the occurrence and duration of each startup and/or shutdown. (10) Records of the occurrence and duration of each malfunct ion of operation (i.e., process equipment) or the air pollution control equipment and monitoring equipment. (11) Records of actions taken during periods of malfunction to minimize emissions in accordance with § 63.1623 (g), including corrective actions to r estore malfunctioning process and air pollution control and monitoring equipment to its normal or usual manner of operation.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 219 of 225 (12) Records that explain the periods when the procedures outlined in the process fugitives ventilation plan required under § 63.162 4 (a), the fugitives dust control plan required under § 63.1624 (b), the site

- specific monitoring plan for CMS required under § 63.1626 (j), the standard operating procedures manual for baghouses required under § 63.1626 (a) and the manganese monitoring alternati ve plan required under § 63.1626 (h)(8) were not followed and the corrective actions taken. (c) You must comply with all of the reporting requirements specified in §63.10 of the General Provisions that are referenced in Table 1 to this subpart. (1) You must submit reports no less frequently than specified under §63.10(e)(3) of the General Provisions. (2) Once a source reports a violation of the standard or excess emissions, you must follow the reporting format required under §63.10(e)(3) until a request to reduce reporting frequency is approved by the Administrator. (d) In addition to the information required under the applicable sections of §63.10, you must include in the reports required under paragraph (c) of this section the information specified in para graphs (d)(1) through (d)(8) of this section. (1) R eports that explain the periods when the procedures outlined in the process fugitives ventilation plan required under § 63.1624 (a), the fugitives dust control plan required under***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 220 of 225 § 63.1624 (b), the site

- speci fic monitoring plan for CMS required under § 63.1626 (j), the standard operating procedures manual for baghouses required under § 63.1626 (a) and the manganese monitoring alternative plan required under § 63.1626 (h)(8) were not followed and the corrective actio ns taken. (2) R eports that identify the periods when the average hourly pressure drop or flow rate of venturi scrubbers used to control particulate emissions dropped below the levels established in § 63.1626 (e) and an explanation of the corrective actions t aken. (3) Bag leak detection system
. R eports including the following information: (i) Records of all alarms. (ii) Description of the actions taken following each bag leak detection system alarm. (4) Reports of the shop building capture system monitoring

re quired under § 63.1626 (h)(1) through (h)(3), (h)(7) and (h)(8) , as applicable, identification of periods when the capture system parameters were not maintained or the manganese concentration exceeded the rolling 10

- sample concentration level as required un der § 63.1623 (b)(3) and an explanation of the corrective actions taken. (5) Reports of the results of monthly inspections of the furnace capture system required under § 63.1626 (g).***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 221 of 225 (6) Reports of the CPMS required under § 63.1626 , an identification of period s when the monitored parameters were not maintained as required in § 63.1626 , and corrective actions taken. (7) If a malfunction occurred during the reporting period, the report must include the number, duration, and a brief description for each type of mal function that occurred during the reporting period and caused or may have caused any applicable emissions limitation to be exceeded. The report must also include a description of actions taken by an owner or operator during a malfunction of an affected

sou rce to minimize emissions in accordance with § 63.1623 (g), including actions taken to correct a malfunction. (8) You must submit records pursuant to paragraphs (d)(8)(i) through (d)(8)(iii) of this section. (i) Within 60 days after the date of completing e ach performance test, as defined in §63.2 and as required in this subpart, you must submit performance test data, except opacity data, electronically to EPA‘s Central Data Exchange by using the Electronic Reporting Tool (see http://www.epa.gov/ttnchie1/ert / ). Only data collected using test methods compatible with the Electronic Reporting Tool are subject to this requirement to be submitted electronically into EPA‘s WebFIRE database. (ii) Within 60 days after the date of completing each CEMS performance ev aluation test, as defined in §63.2 and required by this subpart, you must submit the relative accuracy test audit data***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 222 of 225 electronically into EPA‘s Central Data Exchange by using the Electronic Reporting Tool as mentioned in paragraph (d)(9)(i) of this sectio n. Only data collected using test methods compatible with the Electronic Reporting Tool are subject to this requirement to be submitted electronically into EPA‘s WebFIRE database. (iii) All reports required by this subpart not subject to the requirements i n paragraph (d)(9)(i) and (d)(9)(ii) of this section must be sent to the Administrator at the appropriate address listed in §63.13. The Administrator or the delegated authority may request a report in any form suitable for the specific case (e.g., by elect ronic media such as Excel spreadsheet, on CD or hard copy). The Administrator retains the right to require submittal of reports subject to paragraph (d)(9)(i) and (d)(9)(ii) of this section in paper format. 1 3 . Section 63.1630 is added to read as follows: §63.16 30 Who implements and enforces this subpart? (a) This subpart can be implemented and enforced by the U.S. EPA, or a delegated authority such as the applicable state, local, or tribal agency. If the U.S. EPA Administrator has delegated authority
to a state, local, or tribal agency, then that agency, in addition to the U.S. EPA, has the authority to implement and enforce this subpart. Contact the applicable U.S. EPA Regional Office to find out if this subpart is delegated to a state, local, or tribal ag ency.***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 223 of 225 (b) In delegating implementation and enforcement authority of this subpart to a state, local, or tribal agency under subpart E of this part, the authorities contained in paragraph (c) of this section are retained by the Administrator of U.S. EPA and cannot be transferred to the state, local, or tribal agency. (c) The authorities that cannot be delegated to state, local, or tribal agencies are as specified in paragraphs (c)(1) through (c)(4) of this section. (1) Approval of alternatives to requirements in §§ 63.1620 and 63.1621 and 63.1623 and 63.1624
. (2) Approval of major alternatives to test methods under §63.7(e)(2)(ii) and (f), as defined in §63.90, and as required in this subpart. (3) Approval of major alternatives to monitoring under §63.8(f),

as defined in §63.90, and as required in this subpart. (4) Approval of major alternatives to recordkeeping and reporting under §63.10(f), as defined in §63.90, and as required in this subpart. 14. Section 63.1650 is amended by :

a. Revising paragraph (d); b. R emoving and reserving paragraph (e)( 1 ); and

c . R evising paragraph (e)(2) to read as follows: §63.16 50 Applicability and Compliance Dates.
* * * * ****E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 224 of 225 (d) Table 1 to this subpart specifies the provisions of subpart A of this part that apply to owners and oper ators of ferroalloy production facilities subject to this subpart. (e) * * * (1) [Reserved] (2) Each owner or operator of a new or reconstructed affected source that commences construction or reconstruction after August 4, 1998 and before [INSERT DATE OF P UBLICATION OF THE PROPOSED RULE IN THE FEDERAL REGISTER], must comply with the requirements of this subpart by May 20,1999 or upon startup of operations, whichever is later. 1 5 . Section 63.165 1 is amended by adding a definition for ―Affirmative defense‖ in alphabetic order to read as follows : §63.165 1 Definitions. Affirmative defense means, in the context of an enforcement proceeding, a response or defense put forward by a defendant, regarding which the defendant has the burden of proof, and the merits of w hich are independently and objectively evaluated in a judicial or administrative proceeding.

* * * * * 16. Section 63.1652 is amended by adding paragraph (f) to read as follows: §63.1652 Emission standards.
* * * * ****E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 225 of 225 (f) At all times, you must operate and maintain any affected source, including associated air pollution control equipment and monitoring equipment, in a manner consistent with safety and good air pollution control practices for minimizing emissions. Determination of whether such operation and maintenance procedures are being used will be based on information available to the Administrator that may include, but is not limited to, monitoring results, review of operation and maintenance procedures, review of operation and maintenance records, and inspection of the source. 17. Section 63.1656 is amended by: a. Adding paragraph (a)(6); b. Revising paragraph (e)(1); and c. Removing and reserving paragraph (e)(2)(ii) to read as follows: §63.1656 Performance testing, test methods, and compliance demonst rations. (a) * * * (6) You must conduct the performance tests specified in paragraph (c) of this section under such conditions as the Administrator specifies based on representative performance of the affected source for the period being tested. Upon reque st, you must make available to the Administrator such records as may be necessary to determine the conditions of performance tests.
* * * * * (e) * * ****E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 226 of 225 (1) Fugitive dust sources
. Failure to have a fugitive dust control plan or failure to report deviation s from the plan and take necessary corrective action would be a violation of the general duty to ensure that fugitive dust sources are operated and maintained in a manner consistent with good air pollution control practices for minimizing emissions per §63
. 1652(f)
. (2) * * * (ii) [Reserved]
* * * * * 18. Section 63.1657 is amended by: a. Revising paragraph (a)(6); b. Revising paragraph (b)(3); and c. Revising paragraph (c)(7) to read as follows: §63.1657 Monitoring requirements. (a) * * * (6) Failure to mon itor or failure to take corrective action under the requirements of paragraph (a) of this section would be a violation of the general duty to operate in a manner consistent with good air pollution control practices that minimizes emissions per §63.1652(f). (b) * * * (3)_ Failure to monitor or failure to take corrective action under the requirements of paragraph (b) of this section would be a violation of the general duty to operate in a manner consistent with***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 227 of 225 good air pollution control practices that minim izes emissions per §63.1652(f). (c) * * * (7) Failure to monitor or failure to take corrective action under the requirements of paragraph (c) of this section would be a violation of the general duty to operate in a manner consistent with good air pollution control practices that minimizes emissions per §63.1652(f). 19. Section 63.1659 is amended by revising paragraph (a)(4) to read as follows: (a) * * * (4) Reporting malfunctions
. If a malfunction occurred during the reporting period, the report must includ e the number, duration, and a brief description for each type of malfunction which occurred during the reporting period and which caused or may have caused any applicable emission limitation to be exceeded. The report must also include a description of act ions taken by an owner or operator during a malfunction of an affected source to minimize emissions in accordance with §63.1652(f) , including actions taken to correct a malfunction
. * * * * * 20. Section 63.1660 is amended by: a. Revising paragraphs (a)(2) (i) and (a)(2)(ii); and***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 228 of 225 b. Removing and reserving paragraphs (a)(2)(iv) and (a)(2)(v) to read as follows: (a) * * * (2) * * * (i) Records of the occurrence and duration of each malfunction of operation (i.e., process equipment) or the air pollution contro l equipment and monitoring equipment; (ii) Records of actions taken during periods of malfunction to minimize emissions in accordance with §63.1652(f), including corrective actions to restore malfunctioning process and air pollution control and monitoring equipment to its normal or usual manner of operation;
* * * * * (iv) [Reserved] (v) [Reserved]
* * * * * 21 . Section 63.16 62 is added to read as follows: §63.1662 Affirmative d efense for e xceedance of e mission l imit d uring

m alfunction
. In response to an ac tion to enforce the standards set forth in §63. 1652 through §63.1654 you may assert an affirmative defense to a claim for civil penalties for exceedances of such standards that are caused by malfunction, as defined at 40 CFR 63.2. Appropriate penalties may be assessed, however, if you fail to meet your burden***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 229 of 225 of proving all of the requirements in the affirmative defense. The affirmative defense shall not be available for claims for injunctive relief. (a) To establish the affirmative defense in any action to enforce such a limit, you must timely meet the notification requirements in paragraph (b) of this section, and must prove by a preponderance of evidence that: (1) The excess emissions: (i) Were caused by a sudden, infrequent, and unavoidable failure of a ir pollution control and monitoring equipment, process equipment, or a process to operate in a normal or usual manner, and (ii) Could not have been prevented through careful planning, proper design or better operation and maintenance practices; and (iii) Did not stem from any activity or event that could have been foreseen and avoided, or planned for; and (iv) Were not part of a recurring pattern indicative of inadequate design, operation, or maintenance; and (2) Repairs were made as expeditiously as possi ble when the applicable emission limitations were being exceeded. Off

- shift and overtime labor were used, to the extent practicable to make these repairs; and (3) The frequency, amount and duration of the excess emissions (including any bypass) were minimi zed to the maximum extent practicable during per iods of such emissions; and***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 230 of 225 (4) If the excess emissions resulted from a bypass of control equipment or a process, then the bypass was unavoidable to prevent loss of life, personal injury, or severe property d amage; and (5) All possible steps were taken to minimize the impact of the excess emissions on ambient air quality, the enviro nment and human health; and (6) All emissions monitoring and control systems were kept in operation if at all possible, consistent with safety and good air pollution control practices; and (7) All of the actions in response to the excess emissions were documented by properly signed, contempor aneous operating logs; and (8) At all times, the affected source was operated in a manner

con sistent with good practices for minimizing emissions; and (9) A written root cause analysis has been prepared, the purpose of which is to determine, correct, and eliminate the primary causes of the malfunction and the excess emissions resulting from the

ma lfunction event at issue. The analysis shall also specify, using best monitoring methods and engineering judgment, the amount of excess emissions that were the result of the malfunction. (b) Notification. The owner or operator of the affected source

e xperiencing an exceedance of its emission limit(s) during a malfunction shall notify the Administrator by telephone or facsimile (FAX) transmission as soon as possible, but no later than two business days after the initial occurrence of the malfunction, if it***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 231 of 225 wishes to avail itself of an affirmative defense to civil penalties for that malfunction. The owner or operator seeking to assert an affirmative defense shall also submit a written report to the Administrator within 45 days of the initial occurrence of the exceedance of the standard in §63. 1652 through §63.1654 to demonstrate, with all necessary supporting documentation, that it has met the requirements set forth in paragraph (a) of this section. The owner or operator may seek an extension of this deadl ine for up to 30 additional days by submitting a written request to the Administrator before the expiration of the 45 day period. Until a request for an extension has been approved by the Administrator, the owner or operator is subject to the requirement t o submit such report within 45 days of the initial occurrence of the exceedance. 22. Add Table 1 to the end of subpart XXX to read as follows: Table 1 to Subpart XXX of Part 63 — General Provisions Applicability to Subpart XXX Reference Applies to subpart X XX Comment 63.1 Yes 63.2 Yes 63.3 Yes 63.4 Yes 63.5 Yes 63.6(a), (b), (c) Yes 63.6(d) No Section reserved. 63.6(e)(1)(i) No See 63.1623 (g) and 63.1652(f) for general duty requirement. 63.6(e)(1)(ii) No 63.6(e)(1)(iii) Yes 63.6(e)(2) No Section reserved. 63.6(e)(3) No 63.6(f)(1) No***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 232 of 225 Reference Applies to subpart X XX Comment 6.6(f)(2)

– (f)(3) 63.6(g) Yes 63.6(h)(1) No 63.6(h)(2)

– (h)(9) Yes . 63.6(i) Yes 63.6(j) Yes §63.7(a)

- (d) Yes §63.7(e)(1) No See 63.1625 (a)(5) and 63.1656(a)(6) §63.7(e)(2)

- (e)(4) Yes 6 3.7(f), (g), (h) Yes 63.8(a)

- (b) Yes 63.8(c)(1)(i) No See 63.1623 (g) and 63.1652(f) for general duty requirement. 63.8(c)(1)(ii) Yes 63.8(c)(1)(iii) No 63.8(c)(2)

- (d)(2) Yes 63.8(d)(3) Yes, except for last sentence 63.8(e)

- (g) Yes 63.9(a),( b),(c),(e),(g),(h)(1)thr ough (3), (h)(5) and (6), (i) and (j) Yes

63.9(f) Yes 63.9(h)(4) No Reserved 63.10 (a) Yes 63.10 (b)(1) Yes 63.10(b)(2)(i) No 63.10(b)(2)(ii) No See 63.1629 and 63.1660 for recordkeeping of occurrence and duration of malf unctions and recordkeeping of actions taken during malfunction. 63.10(b)(2)(iii) Yes 63.10(b)(2)(iv)

- (b)(2)(v) No 63.10(b)(2)(vi)

- (b)(2)(xiv) Yes 63.(10)(b)(3) Yes 63.10(c)(1)

- (9) Yes***E.O. 12866 Review – Draft ( 10 / 03 /2011) – Do Not Cite, Quote or Release During Review *** Page 233 of 225 Reference Applies to subpart X XX Comment 63.10(c)(10)

- (11) No See 63.1629 and 63.1630 for recordkeepi ng of malfunctions. 63.10(c)(12)

- (c)(14) Yes 63.10(c)(15) No 63.10(d)(1)

- (4) Yes 63.10(d)(5) No See 63.1629 (d)(8) and 63.1659(a)(4) for reporting of malfunctions. 63.10(e)

- ((f) Yes 63.11 No Flares will not be used to comply with the emission lim its 63.12 to 63.15 Yes