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404 N Wiget Lane <br /> Sequoia Walnut Creek,CA 94598 <br /> iW Analytical (925)988-9603 <br /> FAX(925)988-9673 <br /> www sequoialabs can <br /> Gettler Ryan,Inc -Dublin Project Tosco W208192 <br /> 6747 Sierra Court Suite J Project Number Tosco# 11192 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 18-Oct-02 12 52 <br /> I <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 2H12008-EPA 5030B(PIT) I r ' <br /> Laboratory Control Sample(2H12008-BS3) Prepared&Analyzed 16-Aug-02 <br /> Methyl tert-butyl ether(MTBE) 46 1 20 ug/l 500 922 70-130 <br /> Surrogate Dibromofluoromethane 535 11 500 107 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 500 IF 500 100 50-150 <br /> Matrix Spike(2H12008-MS1) Source W208192-05 Prepared&Analyzed 12-Aug-02 <br /> Methyl tert-butyl ether(MTBE) 470 20 ugll 500 ND 940 60-150 <br /> 1,1-Dichloroethene 58 2 20 500 ND 116 60-140 <br /> Methyl tert-butyl ether(MTBE) 470 20 Soo ND 940 • 60-140 <br /> Benzene 544 20 500 ND 109 60-140 <br /> Tnchloroethene 51 8 2 0 500 ND 104 60-140 <br /> Toluene 559 50 500 ND I'l2 60-140 <br /> Chlorobenzene 489 2 0 500 ND 978 60-140 <br /> i <br /> Surrogate Dibromofluoromethane 511 500 102 50-150 <br /> Surrogate 1 1-Dichloroethane-d4 505 500 101 50-150 <br /> Surrogate Dibromofluoromethane 511 500 102 50-150 <br /> Surrogate 12-Dichloroethane-d4 305 500 101 50-150 <br /> Surrogate Toluene-d8 450 500 900 50-150 <br /> Surrogate 4-Bromofluorobenzene 508 500 102 50-150 <br /> Matrix Spike Dup(2H12008-MSD1) Source W208192-05 Prepared&Analyzed 12-Aug-02 <br /> Methyl tert-butyl ether(MTBE) 490 2 0 ug/1 Soo ND 980 60-150 4 17 25 <br /> 1,1-Dichloroethene 647 2 0 500 ND 129 60-140 106 25 <br /> Methyl tent-bury!ether(MTBE) 490 2 0 500 ND 980 60-140 4 17 25 <br /> Benzene 584 20 500 ND 117 60-140 709 25 <br /> Trichloroethene 579 2 0 500 ND 116 60-140 11 1 25 <br /> Toluene 604 50 500 ND 121 60-140 774 25 <br /> Chlorobenzene W _ 53 8--- 2 0 500 ND _ 108 _ 60-140 954 25 <br /> Surrogate Dibromofluoromethane 508 500 101 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 501 500 100 50-150 <br /> Surrogate Dibromofluoromethane 508 500 102 50-150 <br /> Surrogate I 1-Dichloroethane-d4 501 Soo 100 50-150 <br /> Surrogate Toluene-d8 457 IF 500 914 50-150 <br /> Sequoia Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain <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 /> 13 of 17 <br />