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To subscribe, E-mail the words . . At the other 7 sites, off-site contamination was measured but could not be attributed to the landfills by the strict criteria used in the study. They looked at 122 sites in 15 states and finally selected 50 sites in 11 states for careful evaluation. Sites had to be at least 3 years old. The criteria for determining whether a site was contaminating groundwater were strict.