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40r N WLane <br /> Sequoia Walnut CYeek,CA 94598 <br /> (925)988-9600 <br /> Analytical FAX(916)988-96 <br /> www se uoialabs can <br /> ler Ryan,Inc -Dublin Project Unocal <br /> 47 Sierra Court Suite j Project Number Unocal#2859 Reported <br /> Dub <br /> ltnn CA,94568 Project Manager Deanna L Harding 29-Apr-02 11 22 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2D16009-EPA 5030B(PIT) <br /> Blank(2D16009-BLK1) Prepared&Analyzed 16-Apr-02 <br /> Ethanol ND 500 ug/l <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether(MTBE) ND 20 <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> tett-Amyl methyl ether ND 20 " <br /> 1,2-Dichloroethane ND 20 " <br /> Ethylene dibromide ND 20 " <br /> Surrogate DibromoJluoromethane 518 500 106 50-150 <br /> Surrogate 1 1-Dtchloroethane-d4 534 500 107 50-150 <br /> LCS(2D16009-BS1) Prepared&Analyzed 16-Apr-02 _ <br /> Methyl tert-butyl ether(MTBE) 530 20 ug/l 500 106 70-130 <br /> Voggate DtbromoJluoromethane 549 Soo 110 50-150 <br /> ate 1 1-Dichloroethane-d4 518 500 106 50-150 <br /> Matrix Spike(2D16009-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 Dibromolluoromeihane 466 500 93 50-150 <br /> Surrogate 11-Dtchloroethane-d4 448 Soo 90 50-150 <br /> Matrix Spike Dup(2D76009-MSDI) Source W204191-04 Prepared&Analyzed 16-Apr-02 <br /> Methyl tert-butyl ether(MTBE) 477 20 ug/l 500 25 90 60-150 6 25 <br /> Surrogate Dibromolluaromethane 471 500 94 50-150 <br /> Surrogate 12-Dichloroethane-d4 444 500 89 50-150 <br /> oia 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 />