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i <br /> F - <br /> i <br /> 4—Z_%EnsCCO <br /> Accuracy is measured by Percent Recovery as in: <br /> X recovery = measured concentration <br /> actual concentration) x 100 <br /> Precision is measured using duplicate tests by {relative Percent Difference <br /> (RPU) as in: <br /> RPD = recovery test 1 - recovery test 2 <br /> recovery test 1 + recovery test /2 x 100 <br /> Control_ limits for accuracy (percent recovery) are based on the average, <br /> historical percent recovery +/-3 standard deviation <br /> for precision (relative percent difference) range from i0S(identical limits <br /> up]icate 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 /> Z-Y Analysis Results <br /> Test methods prefaced by "Enseco" .indicate that minor modifications <br /> published EPA Methods were made: such as reporting limit <br /> t , parameter <br /> 1 : <br /> 3 . # 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 /> b3sis,; 3 a no correction is made for moisture content: All data is <br /> „ "blank: corrected" by subtracting the level of contamina' on if any, found t <br /> in. the laboratory method blank from the analytical resul"+ before it is ` <br /> reported. <br /> f� Results are on the attached data sheets. <br /> �. t <br /> i <br /> c � <br /> _ <br />