Subject: Groundwater

TI waiver 198193

The purpose of this memo is to clarify the U.S. Environmental Protection Agency’s (EPA’s) internal consultation process for Superfund groundwater technical impracticability (Tl) Evaluations. It also provides recommendations on how to prepare technically sound Tl Evaluation documents when considering whether a Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) groundwater cleanup site merits an applicable or relevant and appropriate requirement (ARAR) waiver.

TI Waiver Wolford 2011

The purpose of this memorandum is to provide clarification to the 1995 Office of Solid Waste and Emergency Response (OSWER) memorandum entitled, 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.

EPA OM Superfund May 2001

Adequately addressing operation and maintenance (O&M) issues throughout the life of a Superfund remedy is critical to the successful implementation of the Superfund program. O&M measures are designed to maintain the remedy at a site to ensure that the remedy remains protective of human health and the environment. This fact sheet provides an overview of O&M throughout the phases of the Superfund pipeline and presents guidance for Remedial Project Managers (RPMs).