[First Hit]

Datapages, Inc.Print this page

Abstract: Remediation of DNAPL Groundwater Contamination at a Former Landfill Abstract

K. Bill Clark, Bill Bucher, Cam Stringer

A landfilll in western Montana was used for disposal of laboratory waste for a period of five years in the early 1980s. Wastes included chloroform and other chlorinated hydrocarbons which are heavier than water and only slightly soluble in water. These dense non-aqueous phase liquids (DNAPLs) migrated to the water table and eventually created a contaminant plume about three-quarters of a mile long in a residential and commercial area dependent on the aquifer for its water supply.

Remediation efforts to date have consisted of excavation of contaminated Previous HitsoilNext Hit, treatment of Previous HitsoilNext Hit on-site, and pumping and treatment of groundwater. An extensive drilling program was undertaken to delineate the extent of ground-water and Previous HitsoilNext Hit contamination. 75,000 cubic yards of contaminated Previous HitsoilTop and overburden were excavated and the contaminated soils were treated through volatilization of hydrocarbons. Ground-water pumping in the source area, combined with air stripping has further reduced contaminant concentrations. Replacement water supplies are being installed while remediation continues. A ground-water model has been developed which is being used to predict the effect of remedies. A decision on the final remedy for this site will be made in 1996.

AAPG Search and Discovery Article #90952©1996 AAPG Rocky Mountain Section Meeting, Billings, Montana