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Services Provided
ü Environmental Restoration
ü Site Characterization
ü Treatability, Lab and Field
ü Waste Retrieval, Transportation,
Disposal
ü Risk Assessment, Risk-Based
Closure
Technologies Used
ü Acid-Desorption, Enhance Soil
Flushing
ü Groundwater Extraction
ü Drilling
ü Excavation
Relevance
ü Groundwater, Soil
ü Hazardous
ü Commercial Client
Accomplishments
ü Creative solution applied to
drilling
ü Innovative treatability to enhance
soil flushing
ü Timely excavation to
accommodate customer's work
schedule
ü Risk-based approach to achieve
closure
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Title: Soil and Groundwater Remediation and Risk-Based Closure
Client: Texas Instruments
Dallas, Texas
This soil and groundwater remediation project involved application of technologies and engineering methods to
cleanup/treat the residues of hazardous waste constituents (heavy metal and organics) in soil and groundwater resulting from electro-plating operations. Work performed
included treatability testing using a lab-scale acid extraction prototype to test the performance of the acid-desorption technology on soil and groundwater remediation. It also
included on-site pump testing, soil flushing, seepage rate measurement, and acquisition of other hydrogeologic parameters. The test data were then used for a detailed
remedial design, which was followed by remedial action, including the installation and operation of soil flushing and groundwater pump and treat systems. Other work included
risk assessment, clean-up level assessment, soil excavation, closure planning, and regulatory agency negotiation. Drilling was performed in a basement with an extremely low
ceiling; ETAS Corporation was able to resolve the access problem by using a miniaturized equipment to complete the job, not only ahead of schedule, but also with significant
cost saving. As a result of our treatability testing involving acid digestion, adsorption isotherm tests, and modeling capability, ETAS concluded that the site could be closed
using the newly promulgated Texas risk reduction rule, requiring only a limited amount of soil excavation.
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