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Under ordinary kriging or indicator kriging with a block scale decision framework, you must enter the level of confidence for successfully remediating the site to meet the remedial goal (risk or concentration). For example, .90 means that all blocks with greater than 10% chance of exceeding the goal are included in the area of concern. A value of .50 corresponds to an area of concern based solely on the estimated values as seen in the estimation maps. Why can’t you use the confidence option with the site scale? At this point, there is no available method for determining the confidence one may have about the average of a group of correlated blocks exceeding a criteria.