Guidance for Evaluating Technical Impracticability of Ground-Water Restoration
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“Guidance for Evaluating Technical Impracticability of Ground-Water Restoration,” September, 1993.
OSWER Directive 9234.2-25
Cover Page (PDF) (1 p, 1MB)
Part 1 (PDF) (6 pp, 424K)
Part 2 (PDF) (8 pp, 483K)
Part 3 (PDF) (8 pp, 466K)
Part 4 (PDF) (6 pp, 365K)
This interim final guidance clarifies how EPA will determine whether ground water restoration at Superfund and RCRA sites is technically impracticable and if so, what alternative measures must to undertaken to ensure that a final remedy is protective. Topics include the types of technical data needed, the criteria for decisions, the types of documentation needed, and alternative remedial strategies for sites with dense non-aqueous phase liquids (DNAPLs).
“Clarification of OSWER's 1995 Technical Impracticability Waiver Policy,” September, 2011.
OSWER Directive 9355.5-32
Clarification of OSWER's 1995 Technical Impracticability Waiver Policy (PDF) (4 pp, 764KB)
The purpose of this memorandum is to provide clarification to the 1995 Office of Solid Waste and Emergency Response (OSWER) memorandum titled, Superfund Groundwater RODs: Implementing Change This Fiscal Year, July 31, 1995, (OSWER Directive 9335.3-03P) regarding the use of Technical Impracticability (TI) waivers at Comprehensive Environmental Response Compensation and Liability Act (CERCLA) sites with Dense Non-Aqueous Phase Liquid (DNAPL) contamination.
"Summary of Technical Impracticability Waivers at National Priorities List Sites," August, 2012.
OSWER Directive 9230.2-24
Summary of Technical Impracticability Waivers at National Priorities List Sites (PDF) (101 pp, 1.27MB)
The purpose of this report is to provide a summary of Technical Impracticability (TI) waivers that have been issued by EPA's Regional offices, and to distribute brief summaries of completed TI waiver decisions, including a summary of the site conditions and the Regions' rationale for adopting a TI waiver.