On August 13, 1972, a car of red phosphorus, a car white phosphorus, a car of fertilizer, and a car of ties went on the ground at Huben, Mo. White phosphorus is nasty stuff, and will combust when exposed to air. Government officials, and Frisco officials deemed that it was best to bury the burning wreckage. Crews dug a hole, shoved the the burning wreckage into the hole, and then covered the hole. Approximately 50 tons of unburned phosphorus were buried. The Frisco placed an asphalt cap over site, and set a "DO NOT DIG" marker. Later, the asphalt was replaced with several impermeable membranes and a concrete slab. For several years after the derailment, a "plume" of distressed vegetation existed between the site and an unnamed, intermittent stream.