With oversight from the DTSC, Boeing is conducting an investigation of groundwater under and near the Santa Susana site. The goals of the program are to characterize the nature and extent of chemical contamination, evaluate potential risks to people and the environment, and gather data to support the DTSC site-wide cleanup plan.
The investigation entails analyzing groundwater from 260 on- and off-site wells, mapping the geology of Simi Hills, and identifying and sampling seeps and springs. An extraction treatment system treats groundwater pumped from wells throughout the site. The system is capable of treating approximately 100 gallons of water per minute and removes chemicals like trichloroethylene (TCE) and 1,2-dichloroethylene (1,2-DCE).
Under the direction of the Groundwater Advisory Panel, several new techniques have been developed and employed at Santa Susana to provide a detailed examination of the fractured bedrock and deep groundwater. This includes analyzing more than 8,400 rock samples for chemicals, as well as installing measuring devices in numerous wells to study the distribution of the chemical contamination.
There is only one location, in the northeast area of the site, where off-site groundwater appears to be affected. A comprehensive evaluation of the property surrounding the Santa Susana site reveals no traces of chemicals in groundwater emerging above-ground through seeps and springs.
Boeing is conducting a year-long study of possible groundwater cleanup methods using in-situ chemical oxidation. This technology involves injection of a potassium permanganate solution into contaminated groundwater at the northeast corner of the site.