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Hrx£ TWINING EPA 8021 (MTBEBTEX) & EPA 8015M (TPH-Gasoline) ILABORATORIES , i N c LABORATORY CONTROL SPIKE FRESNO/MODESTO/VISAUA/BAKERSFIEW/SAUNAS QUALITY CONTROL REPORT Analyzed By: Eric Scott Reviewed By:J.Ureno Date of Extraction:03/01/03 Date of Analysis:03101103 Twining Laboratories,Inc.Batch ID Number:TL06030103 Sample Matrix:SOIL Spike ID:WS-1000 Constituent Method Blank Laboratory Laboratory Laboratory Acceptable Laboratory Laboratory Relative Concentration Control Spike Control Spike Control Percent Control Spike Control Spike Percent (mg(kg) Concentration Recovery Spike Recovery Range Percent Duplicate Difference j Level (mg/kg) Duplicate (%) Recovery Percent (%) (mg/kg) Recovery Low High (%) Recovery (mg/kg) (%) MTBEBTEX Surrogate(4-Bromofluorobenzene) 0.00 0.0625 0.0600 0.0659 80% 120% 96.0 105 9.37 Methyl Tertiary Butyl Ether 0.00 0.250 0.252 0.252 80% 120% 101 101 0 Benzene 0.00 0.0500 0.0500 0.0520 80% 120% 100 104 3.92 Toluene 0.00 0.0500 0.0470 0.0470 80% 120% 94.0 94.0 0 thylbenzene 0.00 0.0500 0.0520 0.0520 80% 120% 104 104 0 ylencs 0.00 0.150 0.141 0.146 80%1120% 94.0 97.3 3.48 TPH_Gasoline Surrogate(4-Bromofluorobenzene) 0.00 0.0625 0.0629 0.0626 80%1 126% 101 100 0.48 TPH-Gasoline 0.00 2.50 2.40 2.35 80%1120% 96.2 93.9 2.36 EXPLANATIONS: ND Non-Detectable;the target analyte was not found above the detectable limit for reporting purposes(DLR). mg/kg milligrams per kilogram,parts per million(ppm)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.