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February, 1981 PSD Significance Levels for Monitoring 7.4
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7.4
DATE: February, 1981 SUBJECT: PSD Significance Levels for Monitoring
FROM: Darryl D. Tyler, Acting Director TO: Director, Air and Waste Management Division, Regions I - X
The August 7, 1980, PSD promulgation introduced significance levels of projected ambient impacts for the purpose of determining whether a proposed source or modification would be eligible for an exemption from the requirement for ambient monitoring. 40 CFR 51.24(i)(8) and 52.21(i)(8). Typographical errors and miscalculations caused the numbers for either concentration or averaging time printed in the August 7, 1980, document to be incorrect for four pollutants. Those pollutants are nitrogen dioxide, lead, beryllium, and hydrogen sulfide. Attached is a copy of Table A-2 from Ambient Monitoring Guidelines for Prevention of Significant Deterioration (PSD) (EPA-450/4-80-012, Nov. 1980, revised Feb. 1981). In case these revisions have not yet come to your attention, please note that the table contains the correct values and supersedes earlier documents. We expect these values to be the subject of future technical and conforming amendments, to appear in the Federal Register. Should you have any further questions on this topic, you may contact Michael Trutna at FTS 629-5591. Attachment
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