Laserfiche WebLink
Page 5 of 24 <br />SOP NUMBER 28.0 Analytical Data Validation <br />inorganic methods or only the parent sample for organics methods are qualified as estimated <br />• If the matrix spike recovery for an inorganic analyte was <30% (<10% for organics), <br />nondetect results are qualified as unusable ("R") and positive results are qualified as <br />estimated ("J") per Functional Guidelines guidance. <br />If a matrix spike duplicate is also prepared, the reviewer must use professional judgement and <br />consider the recoveries for both the matrix spike sample and the matrix spike duplicate sample <br />prior to assigning data qualifiers for inorganic data. All instances in which professional <br />judgement is used to assign data qualifiers will be detailed in the individual data review <br />narratives. <br />The reviewer should note that for organic data, no qualification of associated samples in the <br />batch or data package will be performed on the basis of matrix spike recoveries alone. The data <br />reviewer should use professional judgement and consider the results of other QC measures such <br />as surrogate recoveries in conjunction with MS/MSD results to determine the need for extending <br />qualification for the affected analytes to the other associated samples. <br />A qualifier code of "MS" will be assigned to all results qualified as estimated or unusable <br />(rejected) on the basis of matrix spike and/or matrix spike duplicate recoveries. The assigned <br />bias code will reflect the inferred bias direction. <br />4.1.5.2 Laboratory Duplicate (LD) Sample Analysis <br />The duplicate and spike duplicate sample analysis results are used to evaluate the precision of <br />the laboratory analyses. Laboratory duplicate or spike duplicate results are evaluated using <br />concentration dependent evaluation criteria. <br />• When both results are > 5x RL, compare the relative percent difference (RPD) between the <br />sample results to a criterion of <_20% for aqueous samples, <_35% for soil and sediment <br />samples, and <50% for biota samples. <br />• If either sample concentration is <_ 5x RL, compare the absolute difference between the <br />results to a criterion of <_lx the greater RL for aqueous samples, 52x the greater RL for soil <br />and sediment samples, and <4x the greater RL for biota samples. <br />All evaluations are done using the higher RL and the RL is used in calculating the absolute <br />difference for a nondetect result. If the applicable duplicate evaluation criterion is not met for an <br />analyte, all associated sample data for that analyte will be qualified as estimated ("RUJ" ). <br />A qualifier code of "D" will be assigned to all results qualified on the basis of laboratory <br />duplicate or spike duplicate results. A bias direction of indeterminate will be assigned to results <br />qualified on the basis of duplicate results. <br />4.1.6 Method-Specific Quality Control Measures <br />Powertech <br />R Squared Inc <br />Rev 28-1 JAB Attachment A la, <br />4/23/2007