Prevention of Significant Deterioration (PSD) Increments

Date	Title	EPA Office	Author	Issued Addressed
05/13/1983	PSD Increment Consumption Guidance	Region 4	Wilburn, James	Regards the amount of degredation of air quality due to an emissions trade at a source for comparison with significance levels as applicable to determining PSD increment consumptions.
12/22/1976	Tall Stack Policy and its Relationship with PSD	OAWM	Strelow, Roger	Discusses tall stack policy and its relationship with Prevention of Significant Deterioration (PSD).
05/03/1985	NSR Advisory Memo #1: TSP PSD Increment Consumption in North Carolina	OAQPS	McCutchen, Gary	Whether a change in the North Carolina State implementation plan consumes increment.
05/20/1992	TSP Redesignation Requests	OAQPS	Paisie, Joseph	Provides guidance on the technical review and processing of request to redesignate existing total suspended particulate (TSP) nonattainment areas to attainment.
03/05/1980	General Applicability of the Existing PSD Regulations, Promulgated June 19, 1978, and the Amendments Proposed September 5, 1979	OE	Wilson, Richard	Response to the following questions related to PSD increment consumption: (1) whether the PSD baseline has been “triggered” in the air shed in which the facility is located; (2) to what extent SO2 emissions from burning coal at the units count towards consumption of PSD increments; and (3) the regulatory framework for assessing the extent of PSD increment consumption.
08/24/1989	Guidance on Implementing the Nitrogen Dioxide (NO2) PSD Increments	OAQPS	Calcagni, John	Response to request for guidance on meeting requirements of the NO2 PSD increments regulation.
09/29/1978	PSD Increment Consumption Question	CPDD	Tyler, Darryl	Whether modifications which were individually less than 100 tons/year potential and which were made to a major source between January 6, 1975, and August 7, 1977 would cumulatively count against PSD increment.
03/13/1980	PSD Increment Baseline	OAQPS	Beal, Bill	Answers the following question: If a source burning 2.1 percent sulfur fuel in 1977 now switches to 3.5 percent sulfur fuel (the legal emission rate under the SIP), will the increase in SO2 emissions consume increment to be included in the baseline? The source was constructed prior to 1975.
01/20/1984	PSD Increment Consumption Calculations	OAQPS	O'Conner, John	Whether the spatial and temporal calculation of PSD increment consumption is the appropriate methodology to be used in the ambient analysis for the Alumax PSD permit.
01/11/1984	Applicability of PSD Increments to Building Rooftops	OAR	Cannon, Joseph	Whether PSD increments apply to rooftops.
02/15/1989	Guidance on Early Delegation Authority for the NO2 Increments Program	OAQPS	Emison, Gerald	Guidance on the procedures to be followed in advancing the effective date of 40 CFR Part 52 for the NO2 prevention of significant deterioration (PSD) increments to enable States seeking delegation of authority to implement the NO2 increments prior to November 17, 1990.
12/11/1978	Baseline Value for PSD Increment Consumption	SSCD	Reich, Edward	Response to memo requesting a determination as to whether consumption of the applicable PSD increment results from the increased utilization of existing boiler capacity at an expanded kraft pulp mill.
02/22/1992	Distribution of Report on Procedures to Estimate Nitrogen Oxides (NOx) Emission Increases from Mobile and Area Sources for Prevention of Significant Deterioration (PSD) Increment Analyses	OAQPS	Noble, Eric	Report estimating NOx emissions from mobile and area sources for PSD nitrogen dioxides increment analyses.
	Colorado's Proposed Short Term Limits Policy	Region 8	Long, Richard	Regards Colorado’s proposed policy for short-term limits.
11/24/1986	Need for Short-Term BACT Analysis for the Proposed William A. Zimmer Power Plant	OAQPS	Emison, Gerald	Whether PSD permits must contain short-term emission limits to ensure protection of the applicable national ambient air quality standards (NAAQS) and PSD increments.
11/29/1978	National Asphalt Pavement Association Questions and Answers on PSD	CPDD	Tyler, Darryl	Respond to several PSD issues, including (1) must asphalt hot-mix plants meeting the requirements of SIP, NSPS, and not impacting on a Class I area or an area where a known violation of an applicable increment exists, undergo a full PSD review? (2) What is considered to be a "safe distance" from a Class I area? (3) Do the 50-ton source requirements apply to nonattainment areas, as well as to attainment areas, and does the offset requirement apply to such a source? (4) Is the application of LAER or BACT required under any circumstances and in any designated area? (5) What is the definition of a known violation of an applicable increment? And (6) How are the emissions for a hot-mix asphalt plant calculated?
02/09/1981	Petitions for Review of PSD Regulations	OAQPS	Trutna, Michael	Provides response to question relating to whether a fuel switch is a major modification under Section 52.21(b)(2)(iii) and under what conditions a decrease in actual emissions that occurs as a result of a reduction in capacity affect increment consumption.
	PSD Determination - Baseline	SSCD	Reich, Edward	Response to request for determination as to whether Colorado-Ute Craig Units should be included in the PSD baseline or if they should be considered increment consuming sources.
04/29/1980	PSD Analysis for SIP Relaxation in Metropolitan Boston Air Pollution Control District - Eastman Gelatin	SSCD	Reich, Edward	Whether a SIP relaxation allowing Eastman Gelatin to burn 2.2% sulfur fuel oil would consume PSD increment.
10/08/1981	PSD Equivalency of Proposed Model Rule for California	OAQPS	Barber, Walter	Guidance on criteria to be used in reviewing State PSD plans. Specifically, this memo focuses on the general approvability of California’s proposed offset-based rule as an equivalent system to protect air quality. Discusses provision for tracking increment consumption and ambient monitoring.
05/20/2014	Guidance for PM2.5 Permit Modeling	OAQPS	Page, Stephen	Provides guidance on demonstrating compliance with the fine particulate matter (PM2.5) National Ambient Air Quality Standards (NAAQS) and Prevention of Significant Deterioration (PSD) increments, especially with regard to considerations of secondarily formed component PM2.5.
12/10/2001	Response to September 7, 2001 Letter on PSD	OAQPS	Seitz, John	Regards the modeling method used to track increment and the use of continuous emissions monitor (CEM) data to replace calculated emissions values based on permit limits. This memorandum also addresses how the Federal Land Manager (FLM) certifications and variance procedures in the Clean Air Act (CAA) affect increment.
09/21/1987	Ambient Air Definition	OAQPS	Helms, G. Tom	Provides clarification on EPA policy on PSD increment consumption on rooftops.
11/19/1992	Interim Guidance on New Source Review (NSR) Questions Raised in Letters Dated September 9 and 24, 1992	Region 6	Meiburg, Stanley	Addresses multiple questions related to the nonattainment NSR program including the following: (1) Does any increase in emissions at a major source trigger the de minimis threshold test? Is there a lower cutoff? (2) What is the exact definition of the 5-year period for the de minimis threshold test? (3) Do major sources, such as asphalt concrete plants, that move often within nonattainment areas, as well as in and out of nonattainment areas, require a nonattainment permit each time they move? (4) TACB states that the definition of major source it serious and severe ozone nonattainment areas in Sections 182 (c) and (d)could be interpreted to include fugitives emissions. They would like to extend this definition to marginal and moderate ozone nonattainment areas for the purposes of Consistency. (5) For sources which trigger review for nitrogen oxides (NOX) under both nonattainment review and PSD, TACB proposes to conduct a combined review which will include nonattainment review enhanced by NOX increment modeling. (6) What are applicants and permit engineers expected to do when implementing lowest achievable emission rate (LAER)?

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