DNAPL recovery evaluations at five MGP sites

Dean A. Hargens, Barbara A. Butler and Mark V. Murphy

Abstract

Dense non-aqueous phase liquids (DNAPLs) have been identified at multiple Midwest former manufactured gas plant (MGP) sites. DNAPL impacts specifically requiring attention are present at Interstate Power and Light Co. (IPL) sites in Carroll, Chariton, Cherokee, Oelwein, and Storm Lake, Iowa,

USA. The State cleanup program in Iowa requires an assessment of the recoverability of DNAPL at any site where it is documented before closure can be obtained. The ultimate goal of the DNAPL recovery evaluation is to determine whether long-term recovery is warranted at a site to protect public

health and environmental resources. Working in conjunction with the State regulatory agency, site-specific recovery evaluations are being completed to determine the feasibility and practicability of DNAPL recovery, as well as to develop recoverability criteria. An overview of the assessment goals and techniques, development of recoverability criteria, and preliminary results of the recovery evaluations will be provided. Potential problems with applying generic DNAPL recoverability criteria in light of site-specific geological and chemical characteristics will be identified and discussed.

Key words: dense non-aqueous phase liquid, manufactured gas plant, recoverability

© 2007 EPP Publications Ltd

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