Using Qualified Data to Document an Observed Release and Observed Contamination

摘要

This fact sheet discusses the use of the U.S. Environmental Protection Agency's(EPA) Contract Laboratory Program (CLP) data and other sources of data qualified with a 'J', 'U', or 'UJ' qualifier or flag. This guidance provides a management decision tool for the optional use of qualified data to document an observed release and observed contamination by chemical analysis under EPA's Hazard Ranking System (HRS). The analyte and sample matrix (i.e., soil or water) specific adjustment factors given in this fact sheet allow biased CLP and non-CLP data to be adjusted to meet the HRS criteria for documenting an observed release and observed contamination with data that are of known and documented quality.