Volatile organic compounds (VOCS) were discovered in the soil during routine maintenance work at the AT and T Richmond Works. Upon this discovery, AT and T initiated a soil vapor and hydrogeologic evaluation of the site in order to determine the nature and extent of VOCs in the soil and groundwater. A network of groundwater monitor wells provided the information necessary to set up a groundwater model of the site and evaluate potential configurations for a network of wells designed to establish hydraulic controls and pump groundwater to an above ground treatment system. State and local agencies and the Environmental Protection Agency participated in selection of the pump and treat approach to remediation and in selection of the configuration of the extraction well network. The network consists of twelve 6-inch diameter wells that are completed in a shallow water bearing zone. Four wells located in the groundwater plume near the source will account for the bulk of mass VOC removals. The remaining eight wells are located along the down gradient perimeter of the site. The perimeter wells win establish a hydraulic barrier to off-site migration and will account for further VOC removals.
