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404 N Wiget Lane <br /> 4D <br /> Sequoia WalnutCredk CA 94596 <br /> Analytical (925)988-9600 <br /> FAX(916)988-9673 <br /> www se uoialabs can <br /> er Ryan,Inc -Dublin Project Unocal <br /> Sierra Court Suite J Project Number Unocal 0 0187 Reported. <br /> Dublin CA,94568 Project Manager Deanna L Harding 29-Apr-02 11 18 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Walnut Creels <br /> ` Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2D16009-EPA 5030B(P <br /> Blank(2D16009-BLKI) Prepared&Analyzed 16-Apr-02 <br /> Ethanol ND 500 USA <br /> tert-Butyi alcohol ND 20 " <br /> Methyl ten-butyl ether(MTBE) ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 " <br /> Surrogate Dibromofluoromethane 528 500 106 50-150 <br /> Surrogate 1,1-Dichloroethane-0 534 500 107 50-150 <br /> LCS(2D16009-BSI) Prepared&Analyzed 16-Apr-02 _ <br /> Methyl tert-butyl ether(MTBE) 530 20 ug/l 500 106 70-130 <br /> Surrogate Dibromofluoromethane 549 " 500 110 50-150 <br /> Surrogate 1,1-Dichloroethane-d4 518 500 106 50-150 <br /> Six Spike(2DI6009-MSI) _^ Source W204191-04 Prepared&Analyzed 16-Apr-02 <br /> Methyl tert-butyl ether(MTBE) 450 20 ugA 500 25 85 60-150 <br /> Surrogate Dibromofluoromethane 466 500 93 50-150 <br /> Surrogate 1,1-Dichloroethane-44 448 " 500 90 50-150 <br /> Matrix Spike Dup (2D]6009-MSDI) Source W204191-04 Prepared&Analyzed 16-Apr-02 <br /> Methyl tert-butyl ether(MTBE) 477 20 ugll 500 25 90 60-150 6 25 <br /> Surrogate Dibromofluoromethane 471 500 94 50-150 <br /> Surrogate 1,2-Dichloroethane-d4 444 Soo 89 50-150 <br /> is Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> 5 of 6 <br />