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Page 9 of 24 <br />SOP NUMBER 28.0 Analytical Data Validation <br />reported as detected will not require qualification since the calculation corrects for reduced <br />extraction efficiency. <br />• If data validation indicates that internal standard area counts are above the upper acceptance <br />limit, then results reported as detected or as not-detected shall be qualified as estimated <br />(" imi"). <br />A qualifier code of "IS" will be assigned to all results qualified on the basis of internal standard <br />area counts. <br />4.1.6.3 Balance of Total versus Partial Analyses <br />Results for the total analysis of a particular analyte should be greater than the results for a partial <br />analysis of that analyte. For example, the results for total metals should be greater than or equal <br />to the results for dissolved metals and ammonia concentrations should not be greater than Total <br />Kjeldahl Nitrogen (TKN) concentrations. Because all results are limited by the accuracy of the <br />analysis, the criteria for accuracy of the analysis are used as the basis for criteria to evaluate the <br />agreement between the results for the partial analysis and the total portion. <br />• In instances where the value for a partial analysis exceeds that for a total analysis and both of <br />the results are >5xRL, the criterion utilized is that the two values should agree within ±30%. <br />For example, the partial analysis result should not be more than 30% higher than the total <br />analysis result. <br />In instances where the value for a partial analysis exceeds that for a total analysis and either <br />of the results is <_SxRL, the absolute difference between the results is compared against an <br />evaluation criterion of ± 2x RL. <br />All evaluations are done using the higher RL and the RL is used for calculating the absolute <br />difference for nondetect results. If the results for the partial versus total analyses do not satisfy <br />the appropriate evaluation criterion, when the result for partial analysis was greater than that for <br />the total analysis, the reviewer should use professional judgment to discern the probable cause <br />and need for qualification of the data. <br />A qualifier code of "TvP" will be assigned to results qualified as estimated based on the <br />comparison of the results for a total analysis and its corresponding partial analysis. <br />4.1.7 Field Quality Control Samples <br />Field QC samples include field duplicate samples, rinsate blank samples, field blank samples, <br />and trip blank samples. <br />4.1.7.1 Field Duplicate Result Agreement <br />Field duplicate samples may be collected in order to assess the overall precision of the analyses <br />(analytical and sampling precision) and/or the representativeness of the samples to the medium <br />sampled. Criteria for evaluating field duplicate results are not provided in the Functional <br />Guidelines. Therefore, analytical results obtained for field duplicate sample pairs are compared <br />to each other using the concentration dependent criteria described below. <br />Powertech R Squared Inc <br />Rev 28-1 JAB Attachment A <br />4/23/2007