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S!551 industrial Road <br /> Sequoia San CarlosTJ0$ CA 94070 <br /> (650)232-9600 <br /> a- )� Analvtical FAX(650)232-9612 <br /> www sequoialabs corn <br /> Ryan/Geostrategies(1) Protect Unocal(4) L208029 <br /> 6 terra Court Suite J Project Number Former Unocal#12859 Stockton Reported <br /> Dublin CA 94568 Project Manager Deanna Harding 08/28/02 1123 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2080019- EPA 5030B IP/T] <br /> Laboratory Control Sample(2080019-BS3) Prepared 08/19/02 Analyzed 08/20/02 <br /> Methyl tent-butyl ether 554 10 ugA 500 111 70-130 <br /> Surrogate 12-Dichloroethane-d4 522 500 104 70-130 <br /> Surrogate'Toluene d8 500 500 100 70-130 <br /> Matrix Spike(2080019-AIS]) Source_ L208034-10 _ Prepared 08/19/02 Analyzed 08/20/02 <br /> Methyl tert-butyl ether 582 10 ug/I 500 ND 116 60-140 <br /> Surrogate 1,2-Dichloroethane-d4 500 500 100 70-130 <br /> Surrogate Toluene-d8 502 500 100 70-130 <br /> Mair x Spike Dup(2080019-MSD1) Source L208034-10 Prepared 08/19/02 Analyzed 08/20/02 <br /> M rt-butyl ether 59 1 10 ug/I 500 ND 118 60-140 153 25 <br /> Surrogate 1,2-Dichloroethane-d4 531 500 106 70-130 <br /> Surrogate Toluene-d8 499 500 998 70-130 <br /> Batch 2080023-EPA 5030B PIT <br /> Blank(2080023-BLK1) Prepared&Analyzed 08/22/02 <br /> Ethanol ND 500 ugA <br /> 1,2-Dibromoethane ND 10 " <br /> 1,2-Dichloroethane ND 10 " <br /> Di-isopropyl ether ND 10 " <br /> Ethyl teri-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 10 " <br /> Tert-amyl methyl ether ND 10 " <br /> Tert-butyl alcohol ND 20 " <br /> Surrogate 1,2-Dichloroelhane-d4 456 500 912 70-130 <br /> Surrogate Toluene-d8 46 7 500 934 70-130 <br /> S Analytical - San Carlos 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 /> Page 16 of 25 <br />