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THE TOTAL PETROLEUM HYDROCARBON: DIESEL & MOTOR OIL <br /> EPA METHOD 8015 <br /> TWINING LABORATORY CONTROL SPIKE <br /> EST. A B 0 R A T 0 R I E S , i N c QUALITY CONTROL REPORT <br /> Analyzed By: Bill Beckham <br /> FRESNO/N OD ESTO/VISALIA/RAKERS FIE LD/SAUNAS <br /> Reviewed By: S. Sharmasarkar <br /> Date of Extraction: 5124102 Date of Analysis: 5/2412002 <br /> Twining Laboratories, Inc. Run ID Number: 2TPH047.1 Sample Matrix: Soil Samples 70202431.6& 11 <br /> Spike ID: WS 1665 <br /> Constituent Method Blank Laboratory 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 0.0 25.0 22.4 22.0 60% 140% 89.6 88.0 1.80 <br /> TPH:Motor oil 0.0 25.0 22.1 23.3 600/1 140% 88.4 93.2 5.29 <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 kilograms,parts per million(ppm)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 />