EPA Method 1662

Each laboratory that uses this method is required to operate a formal quality assurance program (Reference 4). The minimum requirements of this program consist of an initial demonstration of laboratory capability, an ongoing analysis of standards and blanks as a test of continued performance, analyses of spiked samples to assess accuracy, and analysis of duplicates to assess precision.

Laboratory performance is compared to established performance criteria to determine if the results of analyses meet the performance characteristics of the method. If the determination of PAH is to be made on extracts from Method 1662, the quality control samples for initial precision and recovery (IPR), spiked samples, duplicate samples, and ongoing precision and recovery (OPR) samples from Method 1662 shall be substituted for those in the QC tests below, and the specifications in Table 1 for extracts from Method 1662 shall be met.