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� J <br /> Li istco <br /> Test: 602 LCS — <br /> LCS ID: 601M230787MN <br /> Concentration Units: ug/L <br /> Concentration Accuracy Precision <br /> Measured % Recovery RPD <br /> Parameter Spike LCS1 ICS2 LCS1 LCS2 Av. Limits LCS Limit <br /> Benzene 5.0 5.0 5.2 100 104 102 3.9 _ <br /> Toluene 5.0 5.0 5.2 100 104 102 73-107 3.9 10 <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 /> (8 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 /> EPA Method 602 results are on the attached data sheets. Analysis by <br /> capillary GC-FID indicated the following: <br /> mg/L (pian) <br /> CAL I.D. TPH <br /> 30441-001 <0.1 <br /> -002 4.8 (gasoline) <br /> -003 1.7 (gasoline) <br /> -004 4.9 (gasoline) _ <br /> -005 2.2 (gasoline) <br /> -006 12 (gasoline) <br /> -007 1.0 (gasoline) <br />