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rY 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> iW Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P307150 <br /> 30t7 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/23/03 16 39 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3070395-EPA 5030 waters <br /> Laboratoiy Control Sample 3070395-BSl Prepared&Analyzed 07/19/03 <br /> Benzene 5 06 050 ugll 500 101 81-118 <br /> Methyl cert-butyl ether 490 050 500 98 77-123 <br /> Toluene 474 050 500 95 84-119 <br /> Surrogate Dibromofluoromethane 4 73 450 105 84-111 <br /> Surrogate 1 1-Dichloroethane-d4 454 450 101 74-135 <br /> Surrogate Toluene-d8 464 450 103 84-119 <br /> Laboratory Control Sample Dup(3070395-BSDI) Prepared&Analyzed 07/19/03 <br /> Benzene 5 37 0 50 ug/1 500 107 81-118 6 20 <br /> Methyl tert-butyl ether 527 050 5 00 105 77-123 7 20 <br /> Toluene 5 16 050 5 00 103 84-119 8 20 <br /> Wrrogate Dibromofl'uoromethane 467 450 104 84-122 <br /> rrogate I 1-Dichloroethane-d4 4 63 450 103 74-135 <br /> Surrogate Toluene-d8 4 71 4 50 105 84-119 <br /> #quota Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 14 of 16 <br />