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Page 10 of 24 <br />SOP NUMBER 28.0 AnalOcal Data Validation <br />• When both the sample and duplicate values are >5xRL, acceptable sampling and analytical <br />precision is indicated by an RPD between the results of 530% (<_50% for soil samples). <br />• Where the result for one or both analytes of the field duplicate pair is <5xRL, satisfactory <br />precision is indicated if the absolute difference between the field duplicate results is <2xRL <br />(<3.5xRL for soil samples). <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 above criteria are not met for an analyte, all associated <br />sample data for that analyte should be qualified as estimated ("J/UJ"). <br />A qualifier code of "FD" will be assigned to results qualified as estimated on the basis of field <br />duplicate agreement. <br />4.1.7.2 Rinsate Blank Results <br />The results for rinsate blanks reported in the data package will be reviewed. Sample results for <br />analytes detected in an associated rinsate blank at concentrations <5x the equivalent blank <br />concentration (<10x for common laboratory contaminants) will be qualified as nondetect ("U"). <br />The result will be qualified as nondetect at the reported concentration if the reported <br />concentration is >RL or as nondetect ("U") at the RL if the reported concentration is <RL. For <br />aqueous blanks applied to soil/sediment samples, qualification is assigned based on comparison <br />of the sample result to the equivalent concentration in the blank. The equivalent concentration is <br />determined by assuming that all of the analyte present in the blank aliquot analyzed is present in <br />the soil sample aliquot analyzed. The reviewer should note that the blank analyses may not <br />involve the same weights, volumes, or dilution factors as the associated samples. These factors <br />must be taken into consideration when applying the 5x or l Ox criterion, such that a comparison <br />of the total contamination is actually made. <br />A qualifier code of "RB" will be assigned to all results qualified on the basis of rinsate blank <br />results. A bias code of indeterminate will be assigned. <br />4.1.7.3 Field Blank Results <br />The results for field blanks reported in the data package will be reviewed. Sample results for <br />analytes detected in an associated field blank at concentrations <5x the equivalent blank <br />concentration (<1 Ox for common laboratory contaminants) will be qualified as nondetect ("U"). <br />The result will be qualified as nondetect at the reported concentration if the reported <br />concentration is >RL or as nondetect ("U") at the RL if the reported concentration is <RL. For <br />aqueous blanks applied to soil/sediment samples, qualification is assigned based on comparison <br />of the sample result to the equivalent concentration in the blank. The equivalent concentration is <br />determined by assuming that all of the analyte present in the blank aliquot analyzed is present in <br />the soil sample aliquot analyzed. The reviewer should note that the blank analyses may not <br />involve the same weights, volumes, or dilution factors as the associated samples. These factors <br />must be taken into consideration when applying the 5x or IOx criterion, such that a comparison <br />of the total contamination is actually made. <br />A qualifier code of "FB" will be assigned to all results qualified on the basis of rinsate blank <br />results. A bias code of indeterminate will be assigned. <br />Powertech <br />R Squared Inc <br />Rev 28-1 JAB Attachment A <br />4/23/2007