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IqL TOTAL RECOVERABLE PETROLEUM HYDROCARBON <br /> STANDARD METHOD 5520F <br /> TWINING LABORATORY CONTROL SPIKE <br /> EST. AraRIE5 NC , <br /> FeESNcQUALITY CONTROL REPORT <br /> Analyzed By:John Aguirre Reviewed By: S.SHARMASARKAR,Ph.D. <br /> Date of Extraction: 2126103 Date of Analysis: 2126103 <br /> Twining Laboratories, Inc. Run ID Number: TLIR022603-2 Sample Matrix: Soil <br /> Spike Ila:WS 1832 <br /> Constituent Method Blank Laboratory Laboratory Laboraton, Acceptable Laboratory Laboratory Relative <br /> Concenuation Control Spike Control Spike Control Percent Control Spike Control Spike Percent <br /> {mg kg) Concentration Recover�' Spike Recoven Percent Duplicate Difference <br /> Level (-v/kg) Duplicate Range Recovery Percent (%) <br /> (mg/kg) Recovery (° ) (°%o) Rccovcr} <br /> (mg/kg) LOW high (%} <br /> TRPH 0.00 500 549 551 70 1 130 110 110 0.36 <br /> EXPLANATIONS: <br /> ND Non-Detectable;the target analyte%vas 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 use.to determine if method anal}rtcs or other interferences are present in the laboratory <br /> enr ironment,the reagents or equpimeut. <br /> Laboratory Control Spike: A laboratory control spike is generated by addin-1 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 nfiethe <br /> the methodolo'y is controlled and the laboraton.is capable of making precise and accurate measurements. <br />