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- 20:12, 11 May 2018 Debra Tabron (talk | contribs) uploaded File:USEPA-2012. Summary of Technical Impracticability Waivers.pdf (USEPA, 2012. Summary of Technical Impracticability Waivers at National Priorities List Sites. Report with General Technical Impracticability Site Information Sheets. OSWER Directive 9230.2-24.)