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THC TOTAL PETROLEUM HYDROCARBON: DIESEL <br /> EPA METHOD 8015 <br /> TWINING LABORATORY CONTROL SPIKE <br /> EST.1898 L A e 0 R A T o R I E s , i N c QUALITY CONTROL REPORT <br /> FRESNO/M ODESTO/VISALIA/BAKERSFIELD/SALINAS <br /> Reviewed By: S. Sharmasarkar <br /> Analyzed By: Bill Beckham Date of Analysis: 512612002 <br /> Date of Extraction: 5124102 <br /> Sample Matrix: Soil <br /> Twining Laboratories, Inc. Run ID Number: 2TPH047.2 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 /> ITPH: Diesel 0.0 25.0 19.1 18.4 60% 140% 76.4 73.6 3.73 <br /> XPLANATIONS: <br /> Non-Detectable;the target analyte was not found above the detectable limit for reporting purposes(DLR). <br /> gig 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 />