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(D— (651 <br /> trial <br /> Sequoia anCarios CA <br /> San Carlos CA 94070 <br /> � Analytical <br /> 50)2329600 <br /> FAX(650)232.9612 <br /> www sequoialabs corn <br /> Gen]er-RyanlGeostrategzcs(1) Project Unocal(4) ; L208029 <br /> 6747 Sierra Court. Suite I Project Number Former Unocal#12859 Stockton Reported <br /> Dublin CA 94568 Protect Manager Deanna Harding 08/28/02 11 23 <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 Lunt Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2080019- EPA 5030B PIT <br /> Blank (2080019-BLKI) Prepared&Analyzed 08/19/02 <br /> Ethanol ND 500 ug/l <br /> 1,2-Dibromoethane ND 10 " <br /> 1,2-Dichloroethane ND 10 " <br /> Di-isopropyl ether ND 10 " <br /> Ethyl ten-butyl ether ND 10 " <br /> Methyl ten-butyl ether ND 10 " <br /> Ten-amyl methyl ether ND 10 " <br /> Ten-butyl alcohol ND 20 " <br /> Surrogate 12-Dichloroethane-d4 504 - -500 101 70-130 <br /> Surrogate Toluene-d8 503 500 101 70-130 <br /> Blank(2080019-BLK2) Prepared 08/19/02 Analyzed 08/20/02 <br /> Ethanol ND 500 ug/1 <br /> 1,2-Dibromoethane ND 10 " <br /> 1,2-Dichloroethane ND 10 " <br /> Di-isopropyl ether ND 10 " <br />=Ethyl ten-butyl ether ND 1 0 " <br /> Methyl ten-butyl ether ND 10 " <br />�Tert-amyl methy]`etherTT T NDT 1LL0 <br /> Ten-butyl alcohol ND 20 " <br /> Surrogate 1 2-Dichloroethane-d4 528 500 106 70-130 <br /> Surrogate Toluene-d8 508 300 102 70-130 <br /> Laboratory Control Sample(2080019-BSI) Prepared&Analyzed 08/19/02 <br /> Methyl tert-butyl ether 524 10 ugA Soo 105 70-130 <br /> Surrogate 1,2-Dtchloroethane-d4 491 500 982 70-130 <br /> Surrogate Toluene-d8 494 300 988 70-130 <br /> Sequoia Analytical - San Carlos The results to this report apply to the samples analyzed in accordance with the chain o <br /> custody document Unless othenvise stated results are reported on a wer weight basts <br /> This analytical report must be reproduced in its entirei), <br /> Page 15 of 25 <br />