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Long-Term Response Action

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The National Contingency Plan (NCP), 40 CFR 300.435(f)(3), states: "For fund-financed remedial actions involving treatment or other measures to restore ground- or surface-water quality to a level that assures protection of human health and the environment, the operation of such treatment or other measures for a period of up to ten years after the remedy becomes operational and functional will be considered part of the remedial action." The ten year period between the operational and functional (O&F) determination and the start of operations and maintenance (O&M) is defined as a long-term response action, or LTRA. Ground water pump and treat (P&T) and monitored natural attenuation (MNA) remedies with objectives of aquifer restoration are the most common LTRA remedies.

National Contingency Plan (NCP) guidelines on Long-Term Response Actions
(40 CFR Part 300.435(f)(3)) (PDF: 65 KB, 3 pages)

"Transfer of Long-Term Response Action (LTRA) Projects to States" (July 2003)
OSWER 9355.0-81FS, EPA 540-F-01-021 (PDF: 162 KB, 11 pages)

"Policy on Recalculating the Long-Term Response Action (LTRA) Ten-Year Time Period" (June 9, 2006)
OSWER 9355.0-109 (PDF: 115 KB, 4 pages)


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