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Title: An evaluation of the impact of recent flooding on the operation of a groundwater extraction and treatment system at a Superfund Site

A groundwater extraction and treatment system was installed in 1987 at the Des Moines TCE Superfund Site. The purpose of the system is to prevent groundwater contaminated with chlorinated volatile organic compounds (VOCs) from migrating toward an infiltration gallery system which supplies drinking water to the City of Des Moines, Iowa. The extraction system was not operating for a three week period in July and August when the system was flooded by the nearby Raccoon collected as part of a monitoring program have been s the affect of flooding on the operation of the system. Records indicate that the flood did not have a long-term impact on the Performance of the system. An examination of groundwater levels show that groundwater elevations receded quickly after the flood, similar to patterns observed after other periods of heavy precipitation. In fact, data collected nine weeks after the extraction system was returned to service indicate that the system continues to meet its containment objective. Water quality records indicate that the affect of the 1993 flood was similar to trends Observed after earlier periods of heavy precipitation. Trichloroethene concentrations in the treatment system influent and in wells located in the vicinity of suspected source areasmore » increased as a result of rising groundwater levels, and infiltration through residual contamination in the unsaturated zone. Groundwater quality in areas beyond suspected source areas does not appear to have been affected by the 1993 flood.« less
Authors:
; ;  [1]
  1. Eckenfelder Inc., Mahwah, NJ (United States)
Publication Date:
OSTI Identifier:
82815
Report Number(s):
CONF-940789-
ISBN 0-7844-0031-8; TRN: IM9533%%273
Resource Type:
Conference
Resource Relation:
Conference: American Society of Civil Engineers 1994 National Council on Environmental Engineering (NCEE) conference on critical issues in water and waste water treatment, Boulder, CO (United States), 11-13 Jul 1994; Other Information: PBD: 1994; Related Information: Is Part Of Critical issues in water and wastewater treatment. Proceedings of the 1994 national conference on environmental engineering; Ryan, J.N.; Edwards, M. [eds.] [Univ. of Colorado, Boulder, CO (United States). Dept of Civil, Environmental, and Architectural Engineering]; PB: 824 p.
Publisher:
American Society of Civil Engineers, New York, NY (United States)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; GROUND WATER; REMEDIAL ACTION; IOWA; WATER RECLAMATION; CHLORINATED ALIPHATIC HYDROCARBONS; REMOVAL; EXTRACTION APPARATUSES; TECHNOLOGY ASSESSMENT; US SUPERFUND; IN-SITU PROCESSING; WATER POLLUTION CONTROL