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r"E TOTAL PETROLEUM HYDROCARBON: DIESEL <br /> T"l/IV/JIIG EPA METHOD 8015 <br /> MATRIX SPIKE <br /> EST.1898 LA 80 R A T 0 R I ES , I NC . - <br /> FRESNO/MODESTO/VISALIA/BAKERSFIELD/SALINAS QUALITY CONTROL REPORT <br /> Analyzed By: Bill Beckham Reviewed By: S. Sharmasarkar <br /> Date of Extraction: 5124/02 Date of Analysis: 5/26/2002 <br /> Twining Laboratories, Inc. Run ID Number: 2TPH047.2 Sample Matrix: Soil Sample 70202357.1 <br /> Spike ID: WS 1665 <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 /> (mg/kg) Level (mg/kg) Recovery Recovery Recovery Percent Difference <br /> (mg/kg) (mg/kg) Range (%) Recovery (%) <br /> (%) (%) <br /> Low High <br /> TPH: Diesel 0.0 25.0 22.1 19.6 60% 140% 88.4 78.4 12.0 <br /> EXPLANATIONS: <br /> ND Non-Detectable;the target analyte was not found above the detectable limit for reporting purposes(DLR). <br /> mg/kg milligrams per kilogram,parts per million(ppm)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 analyte(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 effect <br /> on precise and accurate analyte detection and quantification. <br />