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THE <br /> TWININGEPA METHOD 8260 <br /> MATRIX SPIKE <br /> ESTA 98 L A H 0 R A T 0 F i E s . . N C . QUALITY CONTROL REPORT <br /> FRESNO/MOD IST O/VISAIIA/BAKERSPW)/5ALI NAS <br /> Analyzed By: Chris Fammatre Reviewed By:Joseph Ureno <br /> Date of Extraction: 03/0412003 Date of Analysis:0310412003 <br /> Twining Laboratories,Inc. Batch ID Number:TL07030403 Sample Matrix:SOIL tap water <br /> S ike ID:W5 150 <br /> Constituent Matrix Sample Matrix Spike Matrix Spike Matrix Spike Acceptable Matrix Spike Matrix Spike Relative <br /> Concentration Concentration Recovery Duplicate Percent Percent Duplicate Percent <br /> (ug/Kg) Level (ug/Kg) Recovery Recovery Recovery Percent Difference <br /> (ugfKg) (ug1Kg) Range (%) Recovery (%) <br /> (%) (%} <br /> Low High <br /> l,l-Dichloroethene 0.000 50.0 41.0 41.3 70% 130% 82.0 82.6 0.729 <br /> Benzene 0.000 51.0 47.0 48.8 70% 130% 94.0 97.6 3.76 <br /> Trichloroethene 0.000 50.0 49.5 50.7 70% 130% 99.0 101 2.40 <br /> Toluene 0.000 50.0 43.3 44.8 700%. 130% 86.6 89.6 3.41 <br /> Chlorobenzene 0.000 50.0 48.2 49.4 70% 130% 96.4 98.8 2.46 <br /> Surrogate:Dibromolluormethane 0.000 50.0 54.7 55.1 86% 118% 109 110 0.729 <br /> Surrogate:To 0.000 50.0 47.4 48.4 86% !10% 94.8 96.8 2.09 <br /> Surrogate:Bromofluourobenzene 0.000 50.0 50.4 52.2 86% 115% 101 104 3.51 <br /> EXPLANATIONS: <br /> D loon-Detectable;the target analyte was not found above the detectable limit for reporting purposes(DLR). <br /> ug/Kg micrograms per Kilogram,parts per billion(ppb)concentration units. <br /> Matrix Sample: The matrix sample is the sample chosen for use in the matrix spike analyses. <br /> Matrix Spike: A matrix spike is generated by adding the target anatyte(s)into the sample noted above. The matrix spike sample is <br /> analyzed exactly like a regular sample,and its purpose is to determine whether the sample matrix has a measurable <br /> effect on precise and accurate analyte detection and quantification. <br />