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l Blvd,North Ste <br /> a— ) (707)Sequoia 1455McDowPetaluma,CA9494 792-1865 <br /> Analytical FAX(707)792 0342 <br /> • www sequoialabs com <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P406416 <br /> 3017 Kilgare Road Suite 100 Project Number WR 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/14/04 16 40 <br /> DRAFT: Volatile Organic Compounds by EPA Method 8260B -Quality Control <br /> Sequoia Analytical-Petaluma <br /> I <br /> Reporting Spike Source %R-EC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPU Limn Notes <br /> Batch 4070035-EPA 5030B waters <br /> Matnx Spike Dup(4070035-MSDI) Source P406422-04 Prepared&Analyzed 07/02/04 <br /> Benzene 15300 500 ugll 5000 10000 106 81 118 5 20 <br /> Ethylbenzene 7010 500 5000 1900 102 89-122 1 20 <br /> Methyl tent-butyl ether 4700 Soo 5000 ND 94 77 123 06 20 <br /> Toluene 25000 Soo 5000 19000 120 64 119 6 20 QM01 <br /> Xylenes(total) 29600 Soo 15000 13000 111 86 132 2 20 <br /> I <br /> Surrogate Dibromofluoromethane 472 500 94 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 429 500 86 74 135 <br /> Surrogate Toluene d8 490 500 98 84 119 <br /> I <br /> I <br /> I <br /> DRAFT REPORT 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 entrrety <br /> Page 17 of 20 <br />