If the ash was less than 5% solids when it was sluiced into the impoundment, and 5% solids or more when removed, the ash is a sludge which was "generated in the course of treatment" for the purpose of this survey.
For more information, see http://www.epa.gov/epawaste/hazard/tsd/ldr/question.htm.
Question C16 describes sludges "generated in the course of treatment". Please clarify what that means. For instance, if ash is sluiced into an impoundment where it is dewatered and then removed, is that ash considered "generated in the course of treatment
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