### Additional Regional Haze Questions August 3 , 2006 Note: The following are questions EPA has received from various States and Regional Planning Organizations (RPOs) related to the submission of regional haze SIPs under the program described b y 40 CFR 51.308. This document provides guidance to the State air pollution control agencies and the general public on meeting the regional haze SIP requirements. These requirements can be found in sections 169A and 169B of the Clean Air Act and 40 CFR 51.300

- 51.309. This document does not substitute for those provisions, nor is it a regulation itself. Thus, it does not impose binding, enforceable requirements on any part y, nor does it assure that EPA may approve all instances of its application, and thus the guidance may not appl y to a particular situation based upon the circumstances. The EPA and State decision makers retain the discretion to adopt approaches on a case

- by

- case basis that differ from this guidance where appropriate. An y de cisions by EPA regarding a particular SIP demonstration will only be made based on the statute and applicable regulations, and will only be made following notice and opportunity

for public review and comment. Therefore, interested parties are free to rais e questions and objections about the appropriateness of the application of this guidance to a particular situation; EPA will, and States should, consider whether or not the recommendations in this guidance are appropriate in that situation. This guidance is a living document and may be revised periodically

without public notice. The EPA welcomes public comments on this document at an y time and will consider those comments in any future revisions of this guidance document. BART 1. Should a State promulgate a BART rule? Should a State's BART rule declare that VOC (and possibly

ammonia) is/are not visibility impairing pollutant(s), or can this declaration be part of the SIP narrative? T he regional haze rule (RHR) does not require that States promulgate BART rules. States are, however, required under 40 CFR 51.230 to show they have the legal authorit y to carry out the SIP. To the extent a BART rule can aid in this requirement, then it should be considered. A State’s regional haze ( RH ) SI P submittal must inc lude source specific BART emission limits and compliance schedules for each source subject to BART. See 40 CFR 51.308(e). All regulatory requirements must be approved into the SI P. A State’s BART rule should not declare that VOCs or ammonia are not v isibility

impairing pollutants unless the State has evidence that VOCs (or ammonia) from its BART
- eligible sources are not significant contributors to particle formation. Such a declaration must be substantiated in the SIP documentation. This declaration may be placed in the SI P narrative, which will be approved into the non

- regulatory portion of the SI P following an opportunity for public review and comment on the State’s conclusion. Furthermore, we recommend that prior to SI P submittal that collaborati on between and among States and RPOs and Federal Land Managers ( FLMs ) occur such that the2

application of exemptions or other principles used by a State/RPO is done with full knowledge among the affected States/RPOs/FLMs. 2. At sources that require BART but that have PTEs of less than 250 TPY for VOCs and ammonia, must the BART proposal anal yz e controls for VOCs and ammonia? States must use their judgment to determine whether VOC or ammonia emissions from individual sources in their State are likel y to h ave an impact on visibility in an area. For a source such as the one y ou have described , the State must consider whether its VOC or ammonia emissions are likely to have an impact on visibility at a Class I area. If so, the BART proposal must analy ze controls for such VOCs and/or ammonia. 3. Should a State declare the exemption threshold value is 0.5 dv (or some other value) in their rule? EPA has simply set an upper bound. The exemption threshold value selected b y the State in determining whether a BAR T
eligible source can reasonably be anticipated to cause or contribute to visibility impairment must be specified in the SI P documentation , as must the basis for the States’ selection of this threshold. The appropriateness of the threshold used b y the St ate will be subject to public review and comment, and States should consult with the affected States/RPOs/FL Ms in establishing this value
. 4. How should a State document in the SIP that BART controls will be installed and in operation as expeditiously a s practicable, but no later than 5 y ears after approval of the SI P? Must BART controls be housed in a Title V permit modification? As specified in 40 CFR 51.308(e)(1)(v), States are required to ensure each source subject to BART install and operate BART as expeditiously as practicable , but in no event later than 5 y ears after approval of the implementation plan revision. States should ensure that BART requirements in a SI P are written in a way that clearl y specifies the individual emission unit(s) subjec t to BART regulation and the time by which the emission unit(s) must begin to comply

with the BART limit . Because the BART requirements are ‘‘applicable’’ requirements of the CAA, they must be included as title V permit conditions according to the procedures established in 40 CFR part 70 or 40 CFR part 71. Under 70.7(f)(1)(i) T itle V permits must be reopened and revised to include new applicable requirements if the permit has three or more y ears of life. The reopening must be completed within 18 months a fter promulgation of the new applicable requirement and the reopening must follow the same procedures (public comment, etc) as apply to initial permit issuance. This may require that States provide commitments in the SI Ps to ensure that all applicable con struction permits under Title 1, and the operating permits under Title V are revised in time. The following elements, at a minimum, must be addressed to ensure the BART controls are adopted into the State’s SI P
. These elements are discussed in detail w ith other circumstances in 40 CFR Part 51, Appendix Y

– Section V.3

 Name of source facility and the specific emission units and pollutants being controlled . (40 CFR 51.308(e)(1)(i) & (ii)).  Specifics of the controls, control efficiency (ies), emissions red uctions expected  Enforceable emission limitations representing BART (40 CFR 51.308(d)(3);(e))  Schedules for compliance with BART (40 CFR 51.308(d)(3);(e))  A requirement that each source subject to BART maintains the control equipment and establish procedures to ensure such equipment is properl y operated and maintained. (40 CFR 51.308(e)(v))  Reporting, monitoring, and recordkeeping requirements adequate to determine the source’s compliance (40 CFR Part 51, Appendix Y

– V )
.  Averaging times and reference methods to determine compliance (40 CFR Part 51, Appendix Y

– V). 5. In the BART guidelines under step 4 of a BART determination is a discussion of average cost effectiveness, yet we don't see an ything being averaged. If one were to average all the individual annual cost effectiveness over the remaining life of a plant, then we could see that we were averaging something. Can you explain this? The term “average cost effectiveness” is a term that the Agency has long used to describe one method of looking at th e costs of control when considering economic impacts. See e.g. New Source Review Draft Manual (Oct. 1990) at B. 3 6 describing the process for making best available control technology determinations (BACT). The Appendix at the end of this document contain s equations that can be used for determining average cost effectiveness and should help y ou to understand how to estimate the “average cost effectiveness” of various control measures. 6. Is there a guideline on how to "annualize" costs (capital recovery fa ctors and levelizing inflation adjusted operation & maintenance costs)? Yes . T he EPA Control Cost Manual , referenced in the final BART rule (see 70 FR 39104, 39163
- 39167 (July 6, 2005 )
. As noted in the Guidelines, the Control Cost Manual is updated periodically . This document is available at the following Web site: **http://www.epa.gov/ttn/catc/products.html** 7. In the BART guidelines under step 4 of a BART determination, "how do I calculate baseline emissions?" it would help if a method were suggested to depict anticipated annual emissions from the source. Otherwise, sources will do this in many different way s. Should States suggest facilities use a method similar to PSD

- th e highest 12 consecutive months in the past 120 months (or whatever it is for PSD)? I f so, should it be different for EGUs as it is for PSD? Or, should a facilit y take the highest 24

- hour actual rate and multiply

it times their average utilization rate f or the highest 2 of the past 5 y ears? In either case, if these cost effectiveness numbers are compared to the BACT/RACT/LAER clearinghouse, it will make a difference. The BART Guidelines state that the baseline emissions used for estimating the average cost effectiveness of a control technology should represent a realistic depiction of4

anticipated annual emissions for the source. The approach for making BACT determinations in the PSD program is similar. The methodolog y of looking at the annual average of the highest 24 consecutive months in the past 120 months is one approach that has been used in PSD when determining if there has been an emissions increase as a result of a modification. In some cases, this approach could a reasonable method of estimating anticipated annual emissions for a source. 8. How do y ou address an issue in which the installation of a BART control causes an increase in another pollutant? In some cases, the installation of controls to reduce emissions of a pollutant can result in collateral increases in another pollutant. For example, the use of low NOx burners can result in an increase in CO emissions
. If the increase in emissions of a collateral pollutant would trigger other requirements under the Clean Air Act, such as New So urce Review, the State may

include the costs, if any , of control ling emissions of a collateral pollutant to meet these other requirements in considering the economic impacts of a technology

under consideration for BART
. 9. How will EPA address the cost effec tiveness of control options? I f an option reduces more than one pollutant, how is that addressed? If an option reduces more than one visibility

- impairing pollutant, it could be justified in terms of the greater overall emission reduction. The State will need to evaluate the cost

effectiveness of controlling both pollutants in light of its evaluation of the other BART factors. In general, the greater the overall emissions from multiple pollutants, the more closely the State should consider controls on mu ltiple pollutants. 10. It is unclear in the responses to the BART Q and A the meaning of some terms. Some appear to be interchangeable. It would be helpful to have definitions for source, site, unit, and plant

- wide (as they pertain to BART). General terms not defined in the BART Guidelines should be given the same plain language meaning that they have under other Clean Air Act programs. T erms which are defined in this and other CAA regulations , and in the statute, should retain those definitions; note how ever that the “BART

- eligible source” refers onl y to stationary sources built within the BART time period (1962

- 77) comprised of the emissions units meeting all three BART

- eligibility criteria
. See 40 CFR 51.301 for definitions of “stationary

source” and “ BART
- eligible source.” “Plantwide” means across the entire geographic entity , or across all “BART

- eligible” sources at the geographic entity (depending on the context). 11. In the BART rule, are we to assume that de minimis levels for pollutants are only b ased on BART
- eligible sources, even when the term “plant

- wide” is used? Generally y es . The approach used b y EPA in the BART Guidelines for ide ntifying a BART
- eligible source begins with the i dentif ication of those emissions units at a plant5

that fall within one or more BART categories and that were put into operation within the 1962
- 1977 timeframe. In 2004, after propos ing that States be allowed to establish de minimis levels for pollutants at BART
- eligible sources , EPA received comments suggesting that de minimis levels be applied on a unit by unit basis. EPA rejected this suggestion in the final rule; the regulations allow States to establish de minimis levels that apply to a BART
- eligible source. In light of the comments received requesting that the de minimis exemption be applied on a unit by unit basis and its decision to reject this approach , EPA made the statement in the BART Guidelines that “[these de minimis levels may

onl y be applied on a plant

- wide basis
. ” This statement was intended to clar ify that the State should consider the cumulative emissions from the units at a plant that comprise the BART

- eligible source in determining whether the BART

- eligible source meets the de minimis exemption requirements. Note, however, that for category on e (fossil fuel fired steam electric plants >250 million Btu/hour), our interpretation of the source category title is that the State should add all EGU emissions at a plant together when determining plant capacity , in order to see if the plant falls within category one. Once you have determined that the plant does fall within the category , the State would only consider those EGUs built within the 1962

- 77 timeframe to actually

be BART

- eligible. 12. If a State determines that a recent BACT determination on an e mission unit is BART, then is a BART emission limit created that is the same as the BACT limit, and is the Title V permit changed so that BART is also listed as a basis for that emission limit? Yes, if a State makes such a determination and includes it in its SI P, then a BART emission limit is created that is the same as the BACT limit . T he Title V permit must be amended to “ specify

and reference the origin of and authority for ” the emission limit
. 40 CFR 70.6(a)(1)(ii). 13. Is EPA presuming a level of control for BART eligible sources in guidance to consider CAI R plus BART plus other "reasonable" measures? Guidance on the level of BART controls is not being developed. BART can only be determined on a case

- by

- case - basis and source

- by

- source - basis using th e modeling and statutory factors listed in 40 CFR 51.308(e)(1)(ii)(A) . Sources have expressed concern that reasonable progress guidance might be interpreted to override BART guidance. The BART assessment is a separate requirement from the reasonable pro gress test. It may be that to meet reasonable progress, more controls are needed from certain sources which may or may not include those sources previously controlled under BART. There is no way for EPA or the States to determine the final strategy to co mpl y with the reasonable progress demonstration until the BART assessment is completed and the suite of controls that are needed for RH is determined. There could also be additional controls that may be identified as needed to demonstrate compliance for the 8

- hour ozone and PM2.5 NAAQS. This may

or may not affect the control identified under BART or CAI R. The States have flexibility

in determining the t yp e, pollutants and mix of sources that could be6

used in developing a strategy for attaining a NAAQS p er the modeling guidance and implementation policy
. 14. Can a source avoid BART by taking s ynthetic minor limits on the PTE of visibility

impairing pollutants? I f so, by when do those limits need to be in place? What kind of mechanism must be in place to en sure those limits are met ? For how long? Yes, a source can opt to revise its Title Ipermit to provide for s ynthetic minor limits so that it falls under the BART eligibility threshold. That permit modification must be done prior to the State going to pub lic hearing on its RH SI P. The State must include the relevant elements of the modified permit in its RH SI P. The limits must be in place for as long as the RH SI P is applicable or for as long as the source is operational
. 15. If the unit is alread y contr olled (e.g., under MACT or BACT) and it is the best, the latest control technology , does the source still need to conduct a full blown BART anal ys is and control technology

evaluation including the installed control device? Or, can the source just describ e the control device on their BART

- eligible source unit and make the case that it qualifies as BART, without having to evaluate other technologies? If the unit has “best, latest...”, then the source can just describe the control device on their BART

- eligibl e source unit and make the case that it qualifies as BART, without having to evaluate other technologies. Th e streamlining of BART anal ys es in this situation is addressed in Section IV.C of the BART Guidelines , “How does a BART review relate to [MACT] Standards under CAA section 112, or to other emission limitations required under the CAA?” 16. A source is built prior to 1962. Between 1962 and 1977, it builds a new emission unit that otherwise meets BART eligible requirements. I s the new unit subject to BAR T? If a State is follow ing the approach for identifying BART

- eligible units described in the BART Guidelines, the unit built between 1962 and 1977 is considered to be BART

eligible
. 17. Although the rule in the Federal Register (FR) , July 6, 2005 page 39107 and elsewhere indicates that the max 24 hour emissions should be used, would EPA approve using double the actuals instead for CAL PUFF BART modeling? As noted in the final BART rule, emissions from a source can vary widel y on a day

to day basis and the “2 4
- hour actual emission rate could be more than double the daily average. See 70 FR at 391 2 9. We recommend that States use the highest 24

- hour average actual emission rate for the most recent three or five y ear period of meteorological data in the CALPUFF model. As EPA explained, “[t]he emission estimates used in the models are intended to reflect steady - state operating conditions during periods of high capacity utilization.” Id. Given the potential variability in actual emissions, use of actual emission s (even double actual emissions) does not necessarily represent this.7

18. If a State participates fully in CAIR, and satisfies its BART obligation for EGUs for NOx and SO2, must the PM BART eligibility analy sis consider whether all visibility impairing pollut ants, summed across a facilit y, exceed 250 tpy, or must onl y the PM emissions be considered? If at the final step of identifying the emission units that constitute a BART

- eligible source, the State finds that a potential BART

- eligible source has the potential to emit 250 tpy of any visibility

- impairing pollutant, then the source is considered BART

- eligible. For example, if a potential BART

- eligible source has emissions of more than 250 tpy of SO2 and meets the other applicable requirements, then it may be subject to BART review for its emissions of PM. However, i f the source’s emissions of PM 10 are less than 1 5 ty p (assuming the State has established a de minimis level of 15 tp y) , then the source’s PM 10 emissions need not be addressed in a BART determinat ion. 1 9
. An EGU has three boilers: a) coal boiler (5500 mmbtu/hr); and b) two auxilliary boilers (181.6 mmBtu/hr each). The State has determined the coal boiler to meet the first test for BART
- eligibility . Since the two auxilliary boilers do not appe ar to fall under an y of the 26 BART categories, would they pass the first test for BART

- eligibility because they contribute to the "steam electric plant"? A s a general matter, a ll the emission units , including an y auxiliary boilers, at a fossil

- fuel fired steam electric plant of more than 250 million BTU/hour heat input would be considered part of the same stationary source. U nder the RH regulations , BART applies to certain existing stationary sources; stationary

sources, in turn, are defined to include “ all of the pollutant

- emitting activities which belong to the same industrial grouping, are located on one or more contiguous or adjacent properties, and are under the control of the same person (or persons under common control). ” 50 CFR 51.301. The regul ations further provide that “[p]ollutant

- emitting activities must be considered part of the same industrial grouping if they belong to the same Major Group (i.e. which have the same two - digit [SI C] code).” For most plants on the BART list, there will be only one 2
- digit SI C code that applies to the entire plant. As you have described the source in y our question , the auxilliary

boilers would fall within the same 2

- digit SI C code as the coal boiler; these units accordingl y are part of the same stationary source as the coal boiler
. Note, however, that if the auxiliary boilers are only

used during startup, then since we do not model startup conditions, those boilers would not contribute an y emissions to the modeled visibility

impact from the source; therefo re those particular boilers may be exempt ed
. Reasonable Progress 1. Is there a metric for determining if controls required for PM2.5, O3, CAIR, or BART are "reasonable" without defining benefit of controls?8

Unlike the technical demonstration for CAIR or BART, the reasonable progress demonstration involves a test of a strategy . The strategy includes a suite of controls that has been identified through the identification of pollutants and source categories of pollutants for visibility

impairment

- the po ssible controls for these pollutants (and their precursors) and source categories

- the application of four statutory factors and how much progress is made with a potential strategy with respect to the glide path. Modeling occurs with a strategy

and is no t a source - specific demonstration like the BART assessment. 2. How can States demonstrate benefits of controls from a single source for RH without doing single source impact modeling, e.g. CALPUFF? Reasonable progress is not required to be demonstrated o n a source - by

- source basis. It is demonstrated based on a control strategy developed from a suite of controls that has been assessed with the four statutory factors and the uniform rate of progress. 3. What if a State is on the glidepath, but can still install cost effective controls? I s it obligated to install those controls? From the preamble to the R egional H aze R ule (64 FR 35732) , EPA explained:

“ If the State determines that the amount of progress identified through the anal ys is is reasonable bas ed upon the statutory factors, the State should identify

this amount of progress as its reasonable progress goal for the first long

- term strategy , unless it determines that additional progress bey ond this amount is also reasonable. If the State determines that additional progress is reasonable based on the statutory

factors, the State should adopt that amount of progress as its goal for the first long

- term strategy
. The statutory

factors must be applied before determining whether given emission reduction measures are reasonable. For example, even if emissions reductions from one source category

are projected to be enough to achieve the uniform rate of progress towards natural background in 60 y ears, States should not forego an anal ys is of what degradation is being caused by pollutants from other source categories, or what improvements could be made b y controlling them
. 4. A. What ty

pe of demonstration is acceptable to justify a reasonable progress goal ( RPG ) that is less than the glidepath? B. What if controls needed for other programs (e.g., PM2.5, ozone, CAI R) are installed? A. If after appl yi ng the four statutory reasonable progress factors, the rate of visibility improvement is still less than the uniform glide path, States may adopt the calculate d RPGs, provided that they explain in the SIP how achieving the uniform glide path is not reasonable based on the application of the factors. States must demonstrate why the slower rate is reasonable, and state the projected date for achieving natural bac kground under this alternative rate of progress.9

B. Existing controls that are installed as a result of other existing CAA programs can contribute to a State’s ability to satisfy its RPG. However, the statutory factors must be applied before determini ng whether given emission reduction measures are reasonable. In particular, the State should adopt a rate of progress greater than the glidepath if this i s found to be reasonable according to the statutory factors. See in particular the directive in the preamble to the RHR at 64 FR 35732
. 5
. Can a source commit to extra control of one visibility

- impairing pollutant in exchange for doing less to control a less significant pollutant (inter

- pollutant trading)? The regulations require the States to adopt m easures that will make reasonable progress toward the national goal. States have the flexibility in developing these measures to focus on those pollutants that have the most significant impact on visibility . A State could conclude that after application of the four statutory reasonable progress factors, it is “reasonable” to control one pollutant to a higher level than another pollutant. In the context of BART, the RHR does not provide for inter

- pollutant trading where the source is installing controls based on the State’s BART determination. The regulations, however, do allow States to adopt alternative measures in lieu of BART, so long as the alternative measures provides for greater reasonable progress than would BART. Inter pollutant trading is not allowed in a trading program alternative to BART,

-- see 64 FR at 35743
. In addition, States may

allow sources to “ average ” emissions across an y set of BART

eligible emission units within a fenceline, so long as the emission reductions from each pollutant being controlled for BART would be equal to those reductions that would be obtained by

simpl y controlling each of the BART

- eligible units that constitute BART

eligible source (70 FR 39172). Coordination with RPOs, States, and FLMs 1. What are EPA's exp ectations and the basis for consultation requirements regarding formal consultative procedures? What constitutes effective FLM communication? Can it be assumed that if the FLM attends the RPO meetings and calls and doesn’t raise an y concerns it has no pr oblems with a State’s SIP? 40 CFR 51.308(i) requires that States consult with FLMs before adopting and submitting their RH SI Ps. These requirements are summarized as follows: States must provide the FLM an opportunity for consultation, in person and at least 60 day s prior to holding any public hearing on the SI P. The State must also provide the opportunity

for the FLMs to discuss their: (i) assessment of impairment of visibility

in any Class I area; and, (ii) recommendations on the development of the RPG and on the development and implementation of strategies to address visibility impairment. Further, the State must include in the10

SI P a description of how it addressed any comments provided by

the FLMs. Lastl y, the SIP must provide procedures for cont inuing consultation between the State and FLMs on the implementation of 51.308, including development and review of SIP revisions and 5

- ye ar progress reports, and on the implementation of other programs having the potential to contribute to impairment of v isibility in Class Iareas. This is a formal consultative process. The basis for requiring written consultation procedures is 40 CFR 51.308(i)(4). To satisfy this requirement, State s should contact the FLMs to ensure their input to the RH SI P process i s solicited and documented. While effective FLM consultation relies on both parties (States and FLMs) communicating earl y and often, the State is only required to meet the provisions of 40 CFR 51.308(i) and is not responsible if a FLM chooses not to parti cipate in the either the RPO activities or the SI P development and r eview process. In such cases, the State should document its outreach efforts to the FLM. 2. Is there a protocol for resolving disputes between States and RPOs regarding technical difference s between upwind and downwind States on EI , modeling, natural background, apportionment, controls, etc.? How will EPA address States/RPOs adopting different IMPROVE algorithms (old vs. new) to look at the same Class I area? EPA is developing a State and Federal Protocol which will describe the goals and objectives, consultation requirements, principles of collaboration, and process for collaboration for the RH process. While conceptual in nature, this document will be designed to form the basis for a common understanding, approach, process and expectations for consultation and consistency in developing the 308 Regional Haze SIPs. EPA is encouraging the early identification of an y potential disputes. This will allow all parties ample opportunity to addres s and document any disagreements. 3. We understand that EPA is requiring each State with a Class Iarea to submit a SI P that addresses its obligations relative to that Class I area including establishment of a uniform rate of progress, imposition of requirem ents to install controls on sources in that State that are considered reasonable, documentation of its collaborative efforts with other States impacting that Class Iarea, and also documentation of interactions with surrounding States regarding that State’ s contributions to Class Iareas in other States. The question is, “When is a State no longer obligated to consult with another State?” States are required under 40 CFR 51.308(d)(3), to collaborate and develop coordinated emission management strategies t o address RH visibility impairment not only

for Class I areas within their own borders, but also for each Class Iareas located outside their borders which may

be affected b y their emissions. The obligation for States to consult with each other ultimately remains in place for the period of time covered by 40 CFR 51.308. In practice, States will satisfy this obligation mainly

during the preparation of the RH SI Ps for the first planning period (2018), due by 12/17/07, and in the preparation of the ten - ye ar periodic revisions, and the five

- ye ar periodic reports described in 40 CFR 51.308(f) and (g), respectively
.11

4. A. Does a State have obligations under the RHR for reasonable progress to initiate discussions with another State whose sources impact one of i ts Class I areas if the projected interim visibility improvement in 2018 falls directly on the uniform rate of progress line for that area? Or can the State focus on defining reasonable progress for its sources without engaging other States with contribut ing sources in discussions? B. Conversel y, do States have obligations under the RHR to evaluate whether their sources are contributing to Class Iareas in surrounding States even though the Class I areas surrounding it are achieving the uniform rate of progress? A. Yes, a State must consult with States having sources reasonabl y anticipated to cause or contribute to visibility

impairment in a Class I

area to develop their RPG s pursuant to 40 CFR 51.308(d)(1)(iv) regardless of the uniform rate of progr ess for an area. B. Yes, States must evaluate whether their sources are contributing to Class I areas in surrounding States even though the Class I areas surrounding it are achieving the uniform rate of progress as noted in answer 4.A. Note also that 4 0 CFR 51.308(d)(3)(i) specificall y requires that States with emissions that are reasonabl y anticipated to contribute to visibility

impairment in another State’s Class Iarea consult with that State to develop coordinated emission management strategies. 5. For Class I areas that span two or more States, is there a requirement for establishing a “lead” State? There is no requirement in the RH regulations nor in guidance documents to identify a “lead” State for shared Class Iareas. However, states may ch oose to establish a “lead” state if it facilitates their collaboration and consultation. The RH rule relies on States collaborating and using the consultation process (RPOs) to address shared Class Iareas. Also, we assume the technical work that is use d as the basis would be the same for all SI Ps. One may

also want to take a look at where the IMPROVE monitor is located that "represents" the Class I area in question, as that location may also help define the "lead" State. Another option is the State wi th the largest portion of the Class Iarea in their State to be the “lead” State. These are ideas that could be used, but it is up to the States to work this out as part of the collaboration and consultation process. We view shared Class Iareas similar to interstate NAAQS nonattainment areas. The States involved would collaborate to set one RPG for the area, and work together to define a consistent, coordinated approach to develop the long

- term strategy for the area. As with interstate NAAQS nonattainment areas, each State has lead responsibility for developing, adopting and submitting its own SIP revisions affecting their portion of the Class Iarea. 6. What if one State with the Class Iarea sets an RP goal that requires an upwind State to make re ductions that it won't make? If a State with a Class I area determines that a contributing State is not doing what is reasonable to meet the RPG set for the area, and has attempted to resolve this issue, the12

State with the Class Iarea should notify EPA and document this issue in its initial RH SI P. For all revisions to the initial RH SI P revision, 40 CFR 51.308(h)(2) requires that the State with the Class Iarea provide notification to EPA and to the other States which participated in the regional plann ing process. This subsection further requires the State with the Class Iarea to collaborate with those States in the regional planning process to develop additional strategies. It is EPA’s expectation that issues of communication/collaboration problems such as this be brought to our attention as earl y in the process as possible. 7
. If State A is at or below the glide path for an area, and a neighboring State (State B) impacting State A's Class Iarea does not do all it can to meet that area's RPGs, what happens? I s State A responsible to file a 126 petition or other action? Could State A's Regional Haze SI P be disapproved because of State B? Are the answers to these questions any

different if State A's RPG is above the glide path? In summary , if c onsultation does not work what happens and who is responsible? State A is responsible for establishing RPG s for its Class Iareas based on its consideration of the factors set forth in the statute and implementing regulations, in consultation with State B and other States that may be contributing to impairment in the area. See 40 CFR 51.308(d)(1) . Each State, including State B, is required to submit a SI P with a long

- term strategy that includes measures as necessary to achieve the RPG s established for th e Class I areas. Where States have participated in a regional planning process, the State must ensure that its SIP includes all measures needed to achieve its share of emissions reductions agreed upon through that process. If there is a disagreement amon g States as to what constitutes reasonable progress, the question of whether State A’s or State B’s RH SI P could be disapproved will depend on the specific of the situation. Each State is also responsible for documenting its good faith attempt to consult with State B, as outlined in 40 CFR 51.308(d)(1)(iv). EPA will take this information into account in determining whether the State’s goal for visibility improvement provides for reasonable progress towards natural visibility conditions. States are under no obligation to file petitions under Section 126 of the CAA to satisfy the reasonable progress requirement under the RH program. 8
. What is necessary in a SIP/template to demonstrate “continuing consultation” under 51.308(i)(4)? M ost States are currently consulting with other States and with the FL Ms by participating in an RPO
. EPA anticipates that most States will address their future FLM consultation requirements b y continuing to participate in an RPO that is engaged in an ongoing assessment of visi bility

issues
. If a State demonstrates that it has met current consultation requirements through participation in an RPO that is engaging in the necessary consultations, and if the State intends to satisfy future consultation requirements (for periodic co mprehensive SI P revisions or for other issues that arise) by continued participation in their RPO, then such a State need only commit to such participation.13

For a State that has not fully engaged in the RPO process , the State must provide a description of the process by which it intends to consult with the FL Ms in preparing future submittals and addressing issues that arise
. Similarly , if a State has participated in an RPO but intends to discontinue this participation, the State must provide extensive description of the alternative means by which the State will engage in the required consultations. 9
. To what extent does EPA expect RPOs to motivate States to communicate directly with and engage the FLMs, particularl y for Class I areas where those FLMs have not been participating in the RPO's work? EPA expect s that the RPOs will serve as the coordinating entities to facilitate State

- to State and State

- FLM consultation. To that end, EPA recommends that RPOs individually

set up a formal process to encourage State
- to - State and State

- FLM consultation to take place, perhaps in the form of a coordinating workgroup. Through managing this process, RPO’s can help identify areas where more FLM participation may be needed
. However, RPO’s are not responsible if a FLM opts not to participate in these consultation opportunities
. Ultimately , it is the State’s responsibility to ensure the FLM consultation requirements housed in 40 CFR 51.308(i) are satisfied. 10
. What are EPA's expectations of an RPO for written c onsultation procedures with the other RPOs/States outside its jurisdiction? Given limited funds and much technical and policy work needed, it is suggested this be made as simple and straightforward as possible. EPA expects that RPOs will serve as the fac ilitating entities for State

- to - State resolution of issues relating to State apportionment of visibility impairment at Class I areas. RPOs should also assist States in the resolution of disputes over the levels of control required by upwind States that co ntribute to visibility impairment of downwind States’ Class I areas. This process should begin b y each RPO identifying Class I areas for which their member States individually cause or contribute to visibility impairment. Following this, the RPOs should meet to broker consensus between the States on the technical approaches to these issues. There is no requirement for an RPO to establish written consultation procedures with the other RPOs/States outside its jurisdiction. EPA expects RPOs to facilitate and/or establish procedures in any format (informal or formal) as needed that works best for the parties involved. 11
. Does section 169A(c)(3) of the CAA require a State to obtain FLM concurrence with a State’s proposal to exempt sources from being sub ject to BART in its Regional Haze SI P submitted to EPA? No . The CAA requires States to make BART determinations for BART

- eligible sources that may reasonably

be anticipate d to cause or contribute to any impairment of visibility in a Class Iarea. In the BART Guidelines, we provides States with an approach for14

exempting potential BART sources from BART by demonstrating that a source does not meet this threshold. Incontrast, under section 169A(c)( 1 ) of the CAA, the Administrator has the authorit y to e xempt most sources from BART if he determines that the source is not reasonabl y anticipated to cause or contribute to significant impairment of visibility
. Section 169A(c)(2) contains a similar provision for certain powerplants. The exemptions under sect ion 169A(c), however, are effective only on concurrence by

the FLM. In sum, while States must consult with FL Ms as part of the SI P process, they are not required to obtain FLM concurrence with their determination that a BART

- eligible source does not cause or contribute to any impairment. Miscellaneous 1. On December 20, 2005, the IMPROVE Steering Committee approved a new algorithm for calculating current and natural background visibility . If states use the new equation in BART and reasonable progress anal ys es, will EPA accept it? Yes, either the new IMPROVE extinction equation as recommended in 2005 by the IMPROVE Steering Committee or the original equation recommended b y EPA in the "Guidance for Estimating Natural Visibility Conditions Under the Regio nal Haze Rule" (September 2003, EOA

- 454/B

- 03
- 005) may be used to develop Regional Haze SI Ps. Regardless of which algorithm is used for a Class I area, that methodology should be applied in a consistent manner. Consistency should be maintained across Regi onal Haze applications (i.e., BART and Reasonable Progress), across time (e.g., baseline and future calculation for natural conditions), and among the stakeholders involved who need to be consulted on the development of a LTS for a Class I Area (i.e., FLMs , states, industry). Specificall y, we recommend that the same version of the IMPROVE equation be used b y S tates/sources which are impacting the same Class Iarea to calculate visibility conditions for that area. The current CAL PUFF modeling sy stem uses an approach that is similar to the original IMPROVE equation. Therefore, a method to apply the new equation with this model for a BART assessment is needed. Consultation with the EPA Regional Office and FLMs on proposals to use the new IMPROVE equation w ith CAL PUFF for a BART assessment is recommended prior to its use in the modeling. 2. Instead of a single value, can the RPG be satisfied using a natural conditions range that captures the variability

in y ear - ye ar emissions of natural events? The 1999 RH R states that in comparing “current conditions” against “ natural conditions, ” natural conditions means “[t]he level of visibility (in deciviews) for the 20 percent most

impaired day s, and for the 20 percent least

- impaired day s, that would exist if there we re no manmade impairment.” 64 FR at 35730. EPA issued a guidance document concerning this entitled, “Guidance for Estimating Natural Visibility Conditions Under the Regional Haze Rule.” Under this guidance, a single value for natural visibility for each class I area is calculated for each of the 20 percent most

- impaired day s and the 20 percent least

impaired day s. This guidance document describes “default” and “refined” approaches for15

estimating natural conditions. The EPA methodology that allows for the 20% best day s and 20% worst day s to calculate natural and background levels is designed to avoid a single value (i.e., the single best day or the single worst day). T he single value that represents the 20% best day s is considered representative of the range. Consequently , it would be redundant and unnecessary to further consider ranges of visibility values in determining natural and background levels. 3
. What obligation does a downwind State have if it conducts modeling based on an upwind State’s emissio n inventory, and the upwind States subsequently changes its inventory ? What is EPA’s expectation here? EPA expect s that States will continue to work together in addressing the problem of RH , both inside and outside the RPO context and that States will sh are pertinent aspects of their SIP planning with other States , as appropriate. Upwind States should use their best effort s to provide potentially relevant information, such as changes in emissions inventories, to downwind States in timely fashion . We are relying on the RPOs , in large part, to ensure this coordination takes place. T he Regional Haze Rule does not establish a deadline by which States should finalize their emission inventor ies for purposes of SIP planning
. EPA recognizes that addressing v isibility impairment is an iterative effort and that States will not alway s be capable of incorporating the most up

- to - date information in their anal ys es for the SIPs due in 2007. I f there is a lack of coordination on this issue that affects the integrit y of a particular State’s SIP, EPA will examine it on a case

- by

- case basis and take into account the specifics of the situation in its review of the SI P. 4
. How does the CAIR substitute for BART? States subject to and participating in the CAIR cap and tra de program for SO2 and NOx may treat the CAIR requirements for EGUs as a substitute for the application of BART controls for these pollutants . States do not need to require BART

- eligible EGUs subject to the CAI R to install, maintain, and operate BART per 40 CFR 51.308(e)(4). In addition, a State which is only subject to CAIR for NOx, but which also chooses to participate in the CAIR trading program for both SO2 and NOx, may consider BART to be satisfied for both SO2 and NOx from EGUs. Because EPA model ed these States as controlling for both SO2 and NOx in the CAI R NFR, the better than BART demonstration presented in that action would be valid in that scenario. Conversel y, if such States choose to participate only in the ozone season NOx trading program , the updated projections presented in the BART rule (70 FR 39104) demonstrate that BART would be satisfied for NOx, but such States would still need to address BART for SO2 emissions from EGUs (70 FR 39143). Also, EPA’s assessment that the CAI R cap and trade programs can substitute for BART controls does not extend to cases where a State has identified source

- specific BART16

requirements as a result of a reasonable attribution determination. In such cases, the source - specific BART requirements must be met at the source. Finally , the CAI R does not address other potential visibility impairing pollutants such as PM, VOCs, and ammonia. Also, the determination that the CAI R makes greater reasonable progress than BART for EGUs is not a determination that the CA IR satisfies all reasonable progress requirements in CAI R affected States. 5
. If a CAIR facility is found to be exempt from BART for SO2 and NOx, and the State does exemption modeling on PM10 and concludes there is no impact on a Class Iarea, can the State totally

exempt the utility

from BART? States subject to and participating in the CAIR cap and trade program for SO2 and NOx are allowed to treat the CAI R requirements for EGUs as a substitute for the application of BART controls per 40 CFR 51.308(e)(4)
. This does not mean EGUs are exempt for SO2 and NOx, only

that CAIR satisfies the BART requirement for those pollutants. The remaining visibility

pollutants to consider for determining BART

- eligible sources are PM, and, using judgment, VOCs, and ammonia . For PM, the July 6, 2005, final BART rule at 70 FR 39160 notes PM10 may be used an indicator for PM in this step of the determination and thus, PM10 can be used for the exemption modeling. 6
. What is the relationship of CAI R to re asonable progress? Does CAI R satisfy reasonable progress requirements for EGU s for NOx and SO2? As discussed in the answer to the previous question, participation in the CAI R can substitute for a State’s BART obligation in certain narrowl y defined areas . However, for the purpose of satisfying the RPG, CAI R has no more applicabilit y than does BART

– it is a control that can be part of a State’s RPG. The preamble to the 2005 BART Rule states that EPA’s determination that participation in the CAIR trading program would provide for greater reasonable progress from EGUs than would BART “ is not a determination that CAIR satisfies all reasonable progress requirements in CAI R affected States
. ” (70 FR 39143). In other words, although EPA has determined that th e CAI R trading program would provide greater reasonable progress than source specific BART controls for affected EGUs for SO2 and NOx, a State ’ s reasonable progress analy ses may indicate that additional controls bey ond CAIR may be necessary

to meet the RP G s set for one or more the Class I areas
. 7
. What is the relationship of RH BART to RAVI BART? RAVIBART (Part I of the visibility program) is a separate regulatory requirement from RH BART (Part II of the visibility program). RAVI BART treats visibility impacts from one source or a small group of sources, as opposed to RH BART , which treats visibility impacts over a wide geographic area
. EPA promulgated regulations addressing “reasonabl y attributable visibility impairment” or RAVIin 1980. Under these regulations, the requirement for a BART analy sis is triggered where the FLM certifies17

there exists reasonable attributable impairment of visibility
. You may find this document a useful guide to understanding the RAVI process : http://www.wrapair.org/forums/mtf/documents/ravi_bart/Final_RA_BART_Report.pdf Once a State has met the requirements in the RH regulations for BART or implemented an alternative measure, then the BART requirements of the Act have been met and BART sources will be subject to regulation under the RH program in the same manner as other sources. 40 CFR 51.308(e)(3). Therefore, even though a State may satisfy BART via a 308 SI P, an FLM ma y still certify RAVI, thus triggering a RAVI BART attribution determination. 8
. What happens if RH SI Ps are late? Section 110(m) of the CAA provides discretionary authorit y for EPA to impose sanctions for failure to submit a required plan. 9
. What is EP A's position on the need to treat VOCs and ammonia as visibility

- impairing pollutants? I f a State wishes to address VOCs and/or ammonia as visibility impairing pollutants, what tools are available to do this? The BART Guidelines direct that States should look at SO2, NOx , and direct PM emissions in determining whether sources cause or contribute to visibility impairment, including both PM10 and PM2.5. As stated in the BART Guidelines (70 FR 39160), “ States should exercise their judgment in deciding wheth er [ VOC s or ammonia ] impair visibility in an area ... and in deciding whether VOCs or ammonia emissions from a source are likel y to have an impact on visibility in an area
. ” A formal showing of an individual decision that a source of VOC or ammonia emissio ns is not subject to BART review is not necessary
. 1 0
. 51.308(d)(3)(v)(B) requires that the State, in developing its L TS, consider measures to mitigate the impacts of construction activities. What should this include? States should include construction activities in their emission inventories that are used for long

- term strategy

development. When EPA promulgated the RHR in 1999, emissions from construction activities, such as emissions from non

- road diesel equipment, and large scale wind

- blown dust fro m rapidly growing areas like L as Vegas and Phoenix, were a major concern. Subsequently , EPA has promulgated rules for on

- road and non

- road heav y dut y diesel engines. States should include the emission reductions from those rules in their SIP planning . I f States have areas where wind blown dust from human activities contributes to a reduction in visibility at Class I areas, they

should consider measures to mitigate this source of visibility

- impairment. The Western Regional Air Partnership (WRAP) has a number of products related to dust that can be downloaded from their site at: http://www.wrapair.org18

1 1
. What is EPA's expectation for filling missing data in the I MPROVE record? How many ye ars are required to deter mine the baseline visibility if data is missing in the 2000

- 2004 record? Are 3 years sufficient (IMPROVE expectation)? Need to create 5 years ? The "Guidance for Tracking Progress Under the Regional haze Rule" addresses this question in several areas. Five (5) ye ars of data from the 2000

- 2004 period should be used. However, because of the deplo ym ent of monitors this length of data may not be available for all Class I areas. The Tracking guidance recognizes this and recommends that a minimum of three ye ars of data should be used if more y ears do not exist (see pages 1
- 4, and 2

- 8). All five y ears should be used if available and suitable per guidance recommendations. If not , then a minimum of three ye ars is recommended. You should not recreate data for ye ars that the monitor was not operational because of the further uncertainty that this data adds
. If less than three years of complete data are not available, consultation with EPA is recommended. T he Tracking guidance suggests that a case

- by

- case p roposal on how this data should be processed should be developed in consultation with EPA OA QPS (and the Regional Office). 12. How are international emissions and natural events addressed in the RH SIPs? EPA addressed the treatment of international emiss ions in the 1999 RHR in a discussion of the long

- term strategy

for making reasonable progress in section III.G of the preamble to the final regional haze rule as follows: "The EPA agrees that the projected emissions from international sources will in some cases affect the ability

of States to meet reasonable progress goals. The EPA does not expect States to restrict emissions from domestic sources to offset the impacts of international transport of pollution. We believe that States should evaluate the impa cts of current and projected emissions from international sources in their regional haze programs, particularl y in cases where it has already been well documented that such sources are important. At the same time, EPA will work with the governments of Cana da and Mexico to seek cooperative solutions on transboundary pollution problems." 64 Fed. Reg. 35714, 35736 (July

1, 1999). EPA provided additional clarification in the preamble to the 1999 RHR on how States should properl y evaluate international emissio ns, when we discussed the States' obligation to submit five

- ye ar reports evaluating progress toward the RPG for each Class I area: "If the State finds that international emissions sources are responsible for a substantial increase in emissions affecting v isibility conditions in any

Class I area or causing a deficiency

in plan implementation, the State must submit a technical demonstration to EPA in support of its finding. If EPA agrees with the State's finding, EPA will take appropriate action to address the international emissions through available mechanisms. Appropriate mechanisms for addressing visibility

- impairing emissions from international19

sources are further discussed in unit III.G on the long

- term strategy ." 64 Fed. Reg. at 35747. Both in explai ning RPGs and in assessing whether current implementation plan strategies are achieving them, States can take into account the nature of international emissions. For instance, after having applied the four statutory factors and calculated their RPGs, stat es can at their discretion, quantify the effects of international emissions on their ability to reach RPGs. However, States should not directly consider the effects of international emissions when calculating their uniform rates of progress b y either addi ng the effects of international emissions to their estimates of natural conditions, or by subtracting international emissions from current conditions. Either of these approaches conflicts with the basic definitions of "current conditions" (baseline condit ions for the first SI P) and "natural conditions," as described in the 1999 RHR. 64 Fe d. Reg. 35728, (July 1, 1999). Those natural events most commonly linked to RH are wind blown dust and emissions from biomass burning. EPA has long recognized the natur al role of fire in the ecos ys tem. Consequently , in determining natural background for a Class I area, EPA believes States should be permitted to consider some amount of fire in the calculation. If a State finds during the five ye ar period review that an unusual natural event such as a large wildfire is affecting progress, this can be taken into account in its assessment of whether the current SI P are sufficient to meet the RPGs. The State should submit a technical demonstration showing its estimate of th e wildfires’ contribution to visibility impairment to support its conclusion.20

**APPENDIX: Question 5 cost equations** Average cost for an individual source Average cost of control option A = annualized capital + operating and mainten ance $ option A / tons removed option A Average cost of control option B = annualized capital + operating and maintenance $ option B / tons removed option B We use the following definitions for analyzing control options across a so urce category or subcategory : Average of individual source costs : Average of individual source costs of control option A = control costs source 1 / tons removed source 1 + control costs source 2 / tons removed source 2 ....

---------------------------- ------------------------------------------------------------------------ total number of sources Average cost over the category : Average cost over the category of control option A = control costs source 1 + control costs source 2 ....

-------------- --------------------------------------------------------------------------------------

tons removed source 1+ tons removed source 2 ....