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UTHE T*7NING EPA METHOD 8260 LS . A 8 0 R A T 0 R I E S , I N C . LABORATORY CONTROL SPIKE FREsra/aooEsro/y4SAUA/a.KrRSFrELa/SAUNAS QUALITY CONTROL REPORT Analyzed By:Chris Fammatre Date of Extraction:03/04/2003 Reviewed By:Joseph Ureno Twining Laboratories,Inc.Batch ID Number:TL0T030403 Date of Analysis:03/04/2003 S ike ID:WS 150 Sample Matrix:SOIL Constituent Method Blank Laboratory Laboratory Laboratory Acceptable LaboratoryLaboratory Relative Concentration Control Spike Control Spike Control Percent Control Spike Control Spike Percent f (ug/Kg) Concentration Recovery Spike Recovery Range Percent Duplicate Difference Level (ug/Kg) Duplicate (%) Recovery Percent (ung) Recovery Low High (%) Recovery (0/-) (ug/Kg) (%) nhloroethene Benzene 0.00 50.0 44.1 49.3 70% 130% 88.2 98.6 11.1 oethc0.00 50.0 49.1 52.4 70% 130% 98.2 105 6.50 Tollueneuene rne 0.00 50.0 52.6 56.1 70% 130% 105 112 6.144 0.00 50.0 45.0 48.2 70% 130% 90.0 96.4 6.87 Chlorobenzene 0.00 50.0 51.$ 54.5 70% 130% 104 Surrogate;Dibromofluormethane 109 5.08 Surrogate;Toluene-d8 0.00 50.0 45.2 5I.5 86% 118% 90.4 103 13,0 0.00 50.0 47.7 48.8 86% 110% 95.4 97.6 Surrogate:Bromofluourobenzene 2.28 50.0 52.$ 51.6 86% 115% 106 103 2.30 EXPLANATIONS: D Non-Detectable;the target analyte was not found above the detectable limit for reporting g/1{g � g purposes(DLR). micrograms per Kilogram,parts per billion(ppb)concentration units. Method Blank: The method blank is used to determine if method analytes or other interferences are present in the laboratory environment,the reagents or equpiment. aboratory Contra]Spike: A laboratory control spike is generated by adding the target analyte(s)into a relatively inert matrix(sodium sulfate or distilled water). The laboratory control sample is analyzed exactly like a sample,and its purpose is to determine wheth the methodology is controlled and the laboratory is capable of making precise and accurate measurements.