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TrHc TOTAL PETROLEUM HYDROCARBON: DIESEL, MOTOR OIL <br /> " EPA METHOD 8015 <br /> EST.1898 LABORATORY CONTROL SPIKE <br /> LABORATORIES , INC . <br /> FRESNO/MODESTO/VISALIA/BAKERSFIELD/SALINAS QUALITY CONTROL REPORT <br /> Analyzed By: Bill Beckham Reviewed By: S. SHARMASARKAR <br /> Date of Extraction: 05/2312002 Date of Analysis: 05/24/2002 <br /> Twining Laboratories, Inc. Run ID Number:2TPH046 Sample Matrix: Aqueous <br /> k LSpike ID: Diesel, WS 1665; Motor Oil ,WS-1627 <br /> Constituent Method Blanaboratory Laboratory Laboratory Acceptable Laboratory Laboratory Relative <br /> Concentration Control Spike Control Spike Control Spike Percent Control Spike Control Spike Percent <br /> (mg/kg) Concentration Recovery Duplicate Recovery Percent Duplicate Difference <br /> Level (mg/kg) Recovery Range Recovery Percent (%) <br /> (mg/kg) (mg/kg) (%) (%) Recovery <br /> Low High (%) <br /> TPH: Diesel 0 400 378 362 60% 1140% 94.5 90.5 4.32 <br /> TPH: Motor Oil 0 400 413 421 60% 140% 103 105 1.92 <br /> EXPLANATIONS: <br /> ND Non-Detectable;the target analyte was not Found above the detectable limit for reporting purposes(DLR). <br /> ug/L micrograms per liter,parts per billion(ppb)concentration units. <br /> Method Blank: The method blank is used to determine if method analytes or other interferences are present in the laboratory environment, <br /> the reagents or equpiment. <br /> Laboratory Control Spike: A laboratory control spike is generated by adding the target analyte(s)into a relatively inert matrix(sodium sulfate or <br /> distilled water). The laboratory control sample is analyzed exactly like a sample,and its purpose is to determine whether <br /> the methodology is controlled and the laboratory is capable of making precise and accurate measurements. <br />