Soil and Soil Gas Investigation, San Fernando Valley, California

When seven production wells operated by a Southern California water purveyor reported detectable concentrations of hexavalent chromium and perchlorate above regulatory limits for drinking water, a multiagency effort was conducted to identify sources. As part of the work, the State regulator commissioned soil and soil gas sampling at the seven properties located near the Tujunga Well Field, which is located in north Los Angeles County. Per information provided by the regulator, former activities conducted at the properties may have been contributing to a release of volatile organic compounds (VOCs) to the soil, soil gas, and groundwater. The investigation was intended to identify sources of Tetrachloroethylene (PCE), Trichloroethylene (TCE), and Carbon Tetrachloride in the Tujunga Well Field, perchlorate, hexavalent chromium and 1-4 Dioxane.