Differences in personnel, procedures, and equipment all lead to variability in data results when collecting a “representative” ground water sample. A number of factors come into play when determining the best sampling method for a particular site and use of the data in decision-making. EPA released a Ground Water Forum Issue Paper, Ground-Water Sampling Guidelines for Superfund and RCRA Project Managers in May 2002 to discuss how to choose the optimal sampling method and equipment.

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