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Sc. <br /> wry� <br /> Test: 602 LCS <br /> LCS 18: 602N.SS0206N <br /> Concentration Units: ug/L <br /> Concentration AccuracyPrecisicn <br /> Ir,easured Recovery RPD <br /> Parameter l.CS1 LCS2 LCS1 LC52 rv. Limits LCS Limit <br /> Benzene 2.5 2.6 2.5 104 100 102 82-112 3.9 11 <br /> Toluene 2.5 2.4 2." C5 56 95 81-114 0 13 <br /> Accuracy is measured by Percent Recovery as in: <br /> ro 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 = a recover test 1 - X recove;-y test 2 x 100 <br /> % recovery test 1 + % recovery test l /2 <br /> Control limits fcr accuracy (percent recovery) are based on the average, <br /> historical percen` recovery 4/-3 standard deviation units. Control limits <br /> for precision (relative percent difference) range from 0 (identical <br /> duplicate LCS resuilts) to the average, historical relative percent <br /> difference + 3 standard deviatiori 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 cn ar. "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 /> { <br /> J; <br /> .i <br /> w, <br /> i - <br /> I 1®►mow®�� <br />