Class I Areas

Date	Title	EPA Office	Author	Issues Addressed
04/05/1978	PSD Determination - Pittston Petroleum Refinery, Eastport, Maine	SSCD	Reich, Edward	Responds to questions raised regarding the emissions and permitting of a refinery that plans locate in close proximity to a Class I area where ships en route to and from the facility may have adverse impact on the Class I increment.
	Response to Follow-Up Questions from the Hearing on "Air Quality Issues Affecting our Forests and Public Lands"	Administrator	Reilly, William	Responds to several follow-up questions from a hearing, including projecting SO₂ and NOx emissions, the impact of the acid rain statutory trading provisions on Class I areas, status of the WEPCO rule, effect of the WEPCO rule on Class I areas, status of the Top-Down BACT policy and its effect on Class I areas.
10/19/1992	Clarification of PSD Guidance for Modeling Class 1 Area Impacts	OAQPS	Seitz, John	Pertains to the appropriate modeling range for Class I area impacts analyses.
02/26/1981	EPA, FWS, NPS Coordination Procedures for Determining Air Quality Impact in Region IV Class I Areas	Region 4	Devine, Thomas	Explains EPA Region 4 procedures for coordinating and notifying FWS and NPS when a SIP, PSD permit application, or SO₂variance requests may affect any Class I areas.
11/29/1978	National Asphalt Pavement Association Questions and Answers on PSD	CPDD	Tyler, Darryl	Responds to several PSD questions from a trade association, including: (1) whether asphalt hot-mix plants meeting the requirements of SIP and NSPS, and not impacting on a Class I area or area of a known violation of an applicable increment, must undergo a full PSD review? (2) What is a "safe distance" from a Class I area? (3) whether the 50-ton source requirements apply to nonattainment areas, and does the offset requirement apply to such a source? (4) What is the definition of a known violation of an applicable PSD increment? and (6) How are the emissions for a hot-mix asphalt plant calculated?
09/10/1991	Class I Area Significant Impact Levels	OAQPS	Calcagni, John	Response to request that EPA develop significant impact levels (SILs) for Class I area PSD increments and weighs in on a state’s proposed methodology for developing NO2 and SO2 SILs prior to EPA establishing national Class I SILs.
12/10/2001	Response to September 7, 2001 Letter on PSD	OAQPS	Seitz, John	Regards the modeling method used to track PSD increment consumption and the use of continuous emissions monitor (CEM) data to replace calculated emissions values based on permit limits. Also addresses how the Federal Land Manager (FLM) certifications and variance procedures in the Clean Air Act (CAA) affect increment.
03/19/1979	Notification to Federal Land Manager Under Section 165(d) of the Clean Air Act	OAR	Hawkins, David	Provides listing of Federal Officials responsible for each of the Class I areas under the jurisdiction of the U. S. Forest Service and the U. S. Fish and Wildlife Service, and transmits a letter directing that the Chief of the Forest Service is the delegated authority to act as the FLM for all lands under the jurisdiction of the Forest Service.
03/11/1991	New Source Review (NSR) Program Supplemental Transitional Guidance on Applicability of New Part D NSR Permit Requirements	OAQPS	Seitz, John	Provides guidance on the permitting of new or modified sources in situations where a State does not submit a State Implementation Plan (SIP) revision implementing the augmented Part D NSR provisions of the 1990 Clean Air Act Amendments by the applicable statutory deadline.
04/23/1982	Department of Interior Procedures for Determinations of Adverse Impact on Certain Federal Lands under the PSD Program	OAR	Schneeberg, Sara and Wyckoff, Peter	Reviews the Department of Interior’s internal procedures for making air quality related value (AQRV) determinations in federal Class I areas and provides an example of DOI applying its AQRV procedures.
04/08/1981	Written Response to National Park Service Regarding Concerns over the Limited Time NPS has to Review PSD Permit Applications for Facilities that may Impact Class I Areas	OAR	Tuerk, Edward	Affirms EPA policy for timely transmittal of PSD permits affecting Class I areas as identified in 3/19/79 Hawkins memo. Also responds to NPS’s request for EPA to initiate rulemaking to ensure NPS has notice of each PSD source with potential Class I area impacts.

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The “Relevant Guidance” index includes a collection of documents issued by EPA organized by topic area. These documents include memoranda, letters, orders, and other types of EPA actions that may provide guidance in one or more forms, such as an adjudication, statement of policy, interpretation of statutes or regulations, or technical information. Each collection is intended to be representative of EPA statements on the topic, but it may not be a complete listing of such statements. The collection does not reflect topic-specific statements that have been expressed by EPA though published rule preambles and Title V petition orders, nor does it include EAB decisions. Each document in the collection speaks for itself, and the inclusion or exclusion of a document in the collection is not intended by EPA to communicate anything more than what is expressed within each document. EPA makes no independent representations on this website as to the extent to which any document in the collection reflects EPA’s current views on the topic, is a final action by EPA, or has any legal effect or precedential weight. Readers are advised to review the documents in the collection and conduct their own assessment of such considerations based on the content of each document and other documents in the collection. Some of the information or views included in the documents may be affected by subsequent changes to the referenced statutory or regulatory language or by court decisions. In addition, many of the statements in these documents are based upon the federal regulations which may differ from rules that govern federally-approved programs. Permitting authorities are advised to consult with their EPA Regional Offices if there is a question as to the relevance of a particular statement to their NSR program.