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THE <br /> TOTAL PETROLEUM HYDROCARBON: DIESEL, MOTOR OIL <br /> EPA METHOD 8015 <br /> TWINING <br /> MATRIX SPIKE <br /> EST. aes <br /> RL A B 0 R A T 0 R I E S , I N C . <br /> FRESNO/MODESTO/VISALIA/RAKERSFIELD/SALIHAS QUALITY CONTROL REPORT <br /> Analyzed By: Bill Beckham Reviewed By: S. SHARMASARKAR <br /> Date of Extraction: 05/10/2002 Date of Analysis: 05/10/2002 <br /> Twining Laboratories, Inc. Run ID Number:2TPH042 Sample Matrix: Aqueous Sample Tap Water <br /> Spike ID: Diesel,WS 1665; Motor 011 , WS-1627 <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 /> 17PH: Diesel 106 400 504 498 60% 140% 99.6 98.4 1.20 <br /> 17PH: Motor Oil 102 400 518 508 60% 140% 103 101 1.95 <br /> EXPLANATIONS:MATRIX INTERFERENCE IN MSD SAMPLE <br /> VD Non-Detectable;the target analyte was not found above the detectable limit for reporting purposes(DLR). <br /> tg/L, micrograms per liter,parts per billion(ppb)concentration units. <br /> vlatrix Sample: The matrix sample is the sample chosen for use in the matrix spike analyses. <br /> vlatrix 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 />