Abstract
Interpretation of a magnetometer survey along the Kansas River floodplain in Riley County, Kansas indicates two major isogam anomalies. The easternmost anomaly is tabular to subcircular, nearly east-west horizontally aligned, and caused by eleven 55-gallon steel drums buried 4 to 6 feet beneath the surface. The drums apparently were buried 20 to 40 years ago. On excavation it was determined that the drums were filled with the liquidhydrocarbon insecticide dichloro-diphenyl-trichloroethane (DDT) and that none of the DDT had leaked from them. The westernmost, smaller, and more circular anomaly is caused by a small drainage culvert buried 3 to 5 feet down.
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