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Seco <br /> Accuracy is measured by Percent Recovery as in: <br /> % recovery = (measured concentration) x 100 <br /> (actual concentration) <br /> Precision is measured using duplicate tests by Relative Percent Difference <br /> (RPD) as in: <br /> RPD = % recover test 1 - % recovery test 2 x 100 <br /> % recovery test 1 + % 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 limits <br /> for precision (relative percent difference) range from 0 (identical <br /> duplicate LCS results) to the average, historical relative percent <br /> difference + 3 standard deviation units. These control limits are updated <br /> on a quarterly basis. <br /> IV Analysis Results <br /> Test methods prefaced by "Enseco" indicate that minor modifications of <br /> published EPA Methods 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 on an "as received" <br /> basis; i .e. , no correction is made for moisture content. All data is <br /> "blank corrected" by subtracting the level of contamination, if 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 />