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404 N Wirt Lane <br /> Sequoia Walnut Creek,CA 94598 <br /> (925)988-9600 <br /> a— ) <br /> Analytical FAX(925)988-9673 <br /> waw sequoialabs cam <br /> ettler Ryan,Inc -Dublin Project Tosco W208192 <br /> 47 Sierra Court Suite J Project Number Tosco 4 11192 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 18-Oct-42 12 52 <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 Leel Result %REC Limits RPD Limit Notes <br /> Batch 2H12008-EPA 5030B_(P/T) <br /> Blank(2H12008-BLK3) Prepared&Analyzed 16-Aug-02 <br /> Ethanol ND 500 upfl <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether(MTBE) ND 20 " <br /> Di-tsopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 " <br /> 1,2-Dichloroethane ND 20 " <br /> Ethylene dibromide ND 20 " <br /> Surrogate Dibromofluoromethane 538 500 108 50-150 <br /> Surrogate 12-Dichloroethane-d4 525 " Soo 105 50-150 <br /> boratory Control Sample(2H12008-BSI) Prepared&Analyzed 12-Aug-02 <br /> yl tert-butyl ether(MTBE) 445 20 ugll 500 890 70-130 <br /> ,I-Dichloroethene 569 20 500 114 65-135 <br /> Methyl tert-butyl ether(MTBE) 445 20 500 890 65-135 <br /> Benzene 509 20 500 102 70-130 <br /> Trichloroethene 470 20 Soo 940 70-130 <br /> Toluene 488 50 500 976 70-130 <br /> Chlorobenzene 505 20 500 101 70-130 <br /> Surrogate Dibromofluoromethane 495 500 990 50-150 <br /> Surrogate 12-Dichloroethane-d4 485 500 970 50-150 <br /> Surrogate Dibromofluoromethane 495 500 990 50-150 <br /> Surrogate 12-Dichloroethane-d4 485 500 970 50-150 <br /> Surrogate Toluene-d8 487 500 974 50-150 <br /> Surrogate 4-Bromofluorobenzene 496 500 992 50-150 <br /> Laboratory Control Sample(2H12008-BS2) Prepared&Analyzed 15-Aug-02 <br /> Methyl tert-butyl ether(MTBE) 360 20 ug/l 500 72 0 70-130 <br /> Surrogate Dibromofluoromethane 384 500 768 50-150 <br /> Surrogate 12-Drchloroethane-d4 409 500 818 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 Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> 12 of 17 <br />