Direct-Push Injection and Circulation Biobarrier to Remediate a TCE Groundwater Plume
Site Description. The Site is located in the New Castle Till Plains and Drainage Ways physiographic region of Indiana (Gray, 2000). Historic use of TCE at a manufacturing plant has impacted an unconfined aquifer. The aquifer is part of a north-south trending glacial outwash channel. The outwash deposits are composed of coarse-grained sands and gravel with occasional interbeds of silty sand and silt that generally coarsen toward the center of the channel. The bedrock surface is located at depths ranging from 30 feet near the western margin of the channel to greater than 120 feet near the center. A plume consisting primarily of TCE has migrated from west to east across the Site toward a regionally significant river located at the center of the outwash channel. The plume is approximately 1,100 feet wide, 6,300 feet long, and up to 50 feet deep.
The properties of the aquifer were characterized by grain size distributions, an eighthour pump test and a sodium bromide tracer test. The specific yield was estimated to be 0.28, and the hydraulic conductivity was calculated to be 204 ft/day. Non-pumping and pumping groundwater flow velocities in the circulation area were approximately 2 and 5 feet per day, respectively.
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