Protection of a 700-GPM Municipal Well Field with a 10-GPM Barrier Well: An Update After 8 Years of Remediation

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by Bernadette H. Kolb, Camp Dresser & McKee Inc, Cambridge, United States,

Document Type: Proceeding Paper

Part of: Engineering Hydrology:

Abstract: In December 1978, a municipal well field developed by the Town of Acton, Massachusetts was shut down because of contamination by 1,1-dichloroethylene. Chemicals and process wash water disposed of in several unlined pits and lagoons since the 1940s at the W.R. Grace and Company facility upgradient of the well field were believed to be the sources of contamination to the aquifer. A three-dimensional computer model to investigate the complex groundwater flow and contaminant transport behaviors at the Grace site was constructed. A thorough understanding at these behaviors was developed during model calibration, and this understanding was used to design and test remedial measures. This paper describes the performance of the pump-and-treat aquifer restoration system that has been in place since 1985, with particular attention to a comparison between numerical model predictions and field data. Brief descriptions of the site, site history and numerical modeling efforts are presented.

Subject Headings: Computer models | Hydrologic models | Numerical models | Groundwater pollution | Remediation | Groundwater flow | Local government | Aquifers | Wells (water) | North America | Massachusetts | United States

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