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THE BASE, NEUTRAL AND ACIDIC SEMIVOLATILES EPA METHOD 8270 LABORATORY CONTROL SPIKE HTWINING to A e o R A 7 o R I E S , ; N c . QUALITY CONTROL REPORT FRESNO/MODESTO/VISAL'AJBAKE RS FI=LC/S AL;NAS Analyzed By: Chris Fammatre Reviewed By: Joseph Ureno Date of Extraction: 02/28103 Date of Analysis: 02/28/2003 Twining Laboratories, Inc. Run ID Number: TL002282003 Sample Matrix: Soil Spike ID:WS 1765 Constituent Method Blank Laboratory Laboratory Laboratory Acceptable Laboratory Laboratory Relative Concentration Control Spike Control Spike Control Percent Control Spike Control Spike Percent (ug/L) Concentration Recovery Spike Recovery Range Percent Duplicate Difference Level (ug/L) Duplicate {%) Recovery Percent (%) (ug/L) Recovery Low High (%) Recovery (ug/L) {%) Phenol 0.00 100 54.4 51.5 5% 112% 54.4 51.5 5.48 2-Chlorophenol 0.00 100 35.1 34.1 23% 134% 35.1 34.1 2.89 1,4-Dichlorobenzene 0.00 50.0 11.8 11.2 20% 124% 23.6 22.4 5.22 n-Nitrosodi-n-propylamine 0.00 50.0 18.9 17.9 10% 230% 37.8 35.8 5.43 1,2,4-Trichlorobenzene 0.00 50.0 25.4 23.4 44% 142% 50.8 46.8 8.20 4-Chloro-3-methylphenol 0.00 100 121.0 120.0 22% 147% 121 120 0.830 Acenapthene 0.00 50.0 33.0 27.8 47% 145% 66.0 55.6 17.1 4-Nitrophenol 0.00 100 18.5 21.7 10% 132% 1.8.5 21.7 15.9 2,4-Dinitrotoluene 0.00 50.0 45.6 45.5 39% 138% 91.2 91.0 0.220 t Pentachlorophenol 0.00 100 25.1 27.4 14% 176% 25.1 27.4 8.76 Pyrene 0.00 50.0 37.8 38.4 52% 115% 75.6 76.8 1.57 EXPLANATIONS: ND Non-Detectable;the target analyte was not found above the detectable limit for reporting purposes(DLR). ug/L micrograms per liter,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. Laboratory Control 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 whether the methodology is controlled and the laboratory is capable of making precise and accurate measurements.