Title

Modeling a Groundwater Circulation Well Alternative

Abstract

Groundwater circulation wells (GCWs) provide an appealing alternative to typical pump-and-treat groundwater remediation systems because of the inherent resource-conservative nature of the GCW systems. GCW performance prediction is challenging because the consideration of extraction and recharge in a single well is unusual for most practitioners, the technology is relatively new, and a meaningful body of literature has not been published. A three-part evaluation process using state-of-the-practice numerical groundwater flow and mass transport models was developed for application during GCW pilot studies at the former Nebraska Ordnance Plant site, Nebraska, USA. A small-scale groundwater flow model was developed during the pilot study planning process to predict the system performance and to locate performance-measuring monitoring wells. Key predictions included the capture zone predicted to develop upgradient of the GCW, the downgradient GCW recharge zone, and the circulation zone centred on the GCW. The flow model was subsequently verified using groundwater elevation data and contaminant concentration data collected during pilot study operation. Aquifer parameters were reestimated as a result of the verification process. Those parameter values were used as input to a larger scale model, which was used to develop a remedial alternative consisting of multiple GCW systems.

Department(s)

Geosciences and Geological and Petroleum Engineering

Keywords and Phrases

Circulation Well; Pump-And-Treat Groundwater Remediation Systems

Library of Congress Subject Headings

Groundwater

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2004 National Ground Water Association, All rights reserved.

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