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June 29, 1989 Implementation of the Revised Modeling Guideline for Prevention of Significant Deterioration (PSD) 6.20The memo describes the specific mechanism by which the revised PSD air quality modeling guidelines should be implemented for each type of program approved to review PSD permits (EPA, State, or local agency programs, depending on whether and to whom EPA has transferred the PSD program).Notebook Entries: 15.2
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