Investigation and Rehabilitation of the Moses Lake Larson Wellfield

by David Banton, Golder Associates Inc, Redmond, United States,
Robert Anderson, Golder Associates Inc, Redmond, United States,

Document Type: Proceeding Paper

Part of: Water Management in the '90s: A Time for Innovation


In 1988, low levels of trichloroethylene (TCE) were detected in several of the Larson wells operated by the City of Moses Lake. The wells are up to 800 feet deep and are completed in fractured basalt. TCE concentrations in the City wells ranged from 5 to 5 ppb. A hydrogeologic investigation concluded that ICE migration within the deeper basalt sequences was controlled by poor well completion practices which allowed contaminated groundwater to migrate between different aquifers. A program of packer testing of one of the contaminated wells was carried out to evaluate whether well modification could reduce TCE concentration and return the well to service. The well is now back in service at much lower cost than had traditional water treatment techniques been employed to remove TCE from the groundwater.

Subject Headings: Water pollution | Water treatment | TCE | Water resources | Water quality | Groundwater pollution | Water supply | Washington | United States

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