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_ f <br /> Erl�b <br /> Test: 602 LCS <br /> LCS 30: 602M880206CH <br /> ty Concentration Units: ug/L <br /> Concentration Accuracy Precision <br /> Measured Recovery RPD <br /> Parameter Spike LC51 LC52 LCS1 LCS2 Av. Limits LCS Limit <br /> Benzene 2.5 2.6 2.5 104 100 102 82-112 3.4 31 <br /> Toluene 2.5 2.4 2.4 95 96 96 81-114 0 13 <br /> t� <br /> Accuracy is measured by Percent Recovery as in: <br /> J recovery = measured concentration x 100 <br /> (actual concentration <br /> Precision is measured using duplicate tests by Relative Percent Difference <br /> Ia (RPD) as in: <br /> RPD = % recovery test 1 - A recovery test 2 x 100 <br /> is % recovery test 1 + recovery test 21/2 <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 snits. These control limits are updated <br /> {. on a quarterly basis. <br /> 1- , ld Analysis Results <br /> I_ <br /> : Test methods prefaced by "Enseco" indicate that minor modifications of <br /> published EPA Idethods 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 haste sampies are reported on an "as received" <br /> basis; i.e., no correction is made for moisture content. All data is <br /> t. "blank corrected" by subtracting the level of contamination, if any, found i <br /> in the laboratory method blank from the analytical result before it is <br /> reported. <br /> Results are on the attached data sheets. i <br /> �k <br /> 4� <br /> 'i <br /> I <br />