Ceresco, Nebraska is located approximately 15 miles north of Lincoln, Nebraska. The former USDA CCC site is located on the north edge of the town. Carbon tetrachloride is found in the soil and water samples from wells and test borings in the vicinity of the site and in Ceresco. Concentrations of carbon tetrachloride above MCL have been detected in former public water supply wells.
Indications are that the plume is moving south and westward along the eastern edge of the village.
To aid in the understanding of the subsurface geology and determine the contaminant flow pathways, a high-resolution shear wave seismic reflection survey was proposed. Approximately 35-70 feet of Pleistocene age sediments overlie Cretaceous age bedrock. The Pleistocene overburden is composed of glacial outwash deposits, fluvial silts, and interbedded sands and clays capped with a surface layer of loess. The bedrock is the Upper Cretaceous Dakota Formation. At the top of bedrock unconformity the Dakota is either shale or sandstone.