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r Enseco <br /> Test: 8020 LCS <br /> LCS ID: 602MO30887GH <br /> Concentration Units: ug/Kg <br /> Concentration Accuracy Precision <br /> Measured % Recovery RPD <br /> Parameter Spike LCS1 LCS2 LCS1 LCS2 Av. Limits LCS Limit <br /> Benzene 500 477 486 --§6 87 97 1.0 <br /> Toluene 500 411 490 82 98 90 79-123 18 21 <br /> _ Test: PH-GC Soil LCS <br /> LCS ID: 30356-SBMS/SBMSD <br /> Concentration Units: ug/L <br /> .. Concentration Accuracy Precision <br /> Measured % Recovery RPD <br /> Parameter Spike LCS1 LCS2 LCS1 LCS2 Av. Limits LCS Limit <br /> gasoline 100000 78000 77000 78 —7—7 17.5 81-93 1.3 24 <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 = (% recovery test 1 - % recovery test 2 x 100 <br /> % recovery test 1 + % recovery test 2)/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 units. These control limits are updated <br /> on a quarterly basis. ' <br /> IV Analysis Results <br /> Results for Enseco Method 8020 are on the attached data sheets. <br /> Analysis by capillary GC-FID indicated the following: <br /> mg/kq (ppm) <br /> CAL I.D. TPH <br /> 30356-MB 10 <br /> -1 <10 <br /> -2 (10 <br /> -3 <10 <br /> -4 <10 <br /> '� -5 <10 <br />