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s <br /> FJ I s KO <br /> Test: E020 ECS <br /> " LCS ID: E0200102SSJJ <br /> Concentration Units: uo/kg <br /> Concentration ACC I:rac _ Precision <br /> L,Ile asred X Recover PPD <br /> Parameter Spike LCS1 LC52 LCSI LCS2 „v. Limits LCS Li-,it <br /> benzene 250 218 216 €7 °6 wC 74-324 1.2 li <br /> Toluene 250 272 Z48 109 99 104 72-127 9.6 19 <br /> Accuracy is measured by Percent Recovery as in: <br /> recovery = (measured concentrationj x 100 <br /> (actual concentration <br /> Precision is measured using duplicate tests by Relative Percent Difference <br /> (P.PD) as in: <br /> RPI) X recovery test 1.-- X recovery test 2 x 100 <br /> -- - <br /> 1% recovery test 1 + X recovery test 2 /Z <br /> Control limits for accuracy (percent recovery) are based on the average, <br /> historical percent recovery +/-3 standard deviation units. Control lifnits <br /> for prec pion (relative percent difference) range from 0 (identical <br /> duplica=.c': ''S results) to the average, historical relative percent <br /> differvice + 3 standard deviation units. These control limits are updated <br /> on a quarterly basis. <br /> tw <br /> IV Analysis Results <br /> Test methods prefaced by "Enseco" indicate that minor modifications of <br /> published EPA I.ethcds were made such as reporting limits or parameter <br /> lists. Reporting limits are adjusted to reflect dilution of the sample, <br /> when appropriate. Solid and waste samples are reported oa an "ac received" <br /> basis; i.e., no correction is made for moisture content. All data is <br /> "blank corrected" by subtracting the level of contamination, €f any, found <br /> in the laboratory method blank from the analytical result before it is <br /> reported. <br /> _. Results are on the attached data sheets. <br />