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THE TOTAL PETROLEUM HYDROCARBON: DIESEL & MOTOR OIL <br /> TWINING EPA METHOD 8015 <br /> MATRIX SPIKE <br /> EST.1898 LABORATORIES , INC . <br /> FRESNO/MODESTO/VISALIA/RAHERSFIELD/SALINAS QUALITY CONTROL REPORT <br /> Analyzed By: Bill Beckham Reviewed By: S. Sharmasarkar <br /> Date of Extraction: 5/24/02 Date of Analysis: 5/24/2002 <br /> Twining Laboratories, Inc. Run ID Number: 2TPH047.1 Sample Matrix: Soil Samples 70202431.6 & 11 <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 21.0 21.0 60% 140% 84.0 84.0 0.00 <br /> TPH:Motor oil 0.0 25.0 24.2 24.0 60% 140% 96.8 96.0 0.83 <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 />