Beasley, Allen, Crow, Methvin, Portis & Miles, P.C.

Four conditions created extra stress and movement in the massive coal ash pond at the Tennessee Valley Authority (TVA) Kingston, Tennessee plant and caused the impoundment to breach last December, sending a wave of toxic material on to 300 acres of nearby property, according to a study conducted by Los Angeles-based AECOM USA Inc. and released Thursday. Those factors include high water content of the ash, the height of the pile, the construction of sloping dikes over wet ash around the landfill, and a hidden layer of fly ash “slime” hidden 40 to 85 feet below the section of pond that breached.

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