IMPLEMENTATION OF DETERMINISTICALLY-DERIVED HYDROSTRATIGRAPHIC UNITS INTO A 3D FINITE ELEMENT MODEL AT THE LAWRENCE LIVERMORE NATIONAL LABORATORY SUPERFUND SITE

摘要

The Lawrence Livermore National Laboratory (LLNL) facility is a highly developed research facility that is implementing an extensive ground water remediation program. In 1982, multiple plumes of volatile organic compounds (VOCs), predominantly trichloroethene (TCE) and tetrachloroethene (PCE), were discovered in ground water beneath LLNL. In 1987, LLNL was placed on the U.S. Environmental Protection Agency's National Priority List. The environmental investigation covers an area of about 2 square miles to depths over 300 ft. As part of the environmental cleanup activities, LLNL operates a large ground water extraction system to remediate the VOC plumes beneath the site. In 2000, this system included a total of 80 ground water extraction wells connected to 25 separate treatment facilities. These combined facilities treated about 308 million gallons of ground water at an average combined flow rate of 600 gpm, and removed about 270 kg of VOCs in 2000. To better manage this large complex remediation system, a finite-element numerical model was developed.