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Sequoia 1455 McDowell Blvd, North Ste D <br /> Petaluma, CA 94954 <br /> 1W Analytical (707)792 342 <br /> Y FAX(707)792 0342 <br /> www sequolalabs ce <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P311302 <br /> 3017 Ktlgare Road Suite 100 Project Number 38984 Reported: <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/01/03 15 25 <br /> Volatile Orgamc Compounds by EPA Method 8260B -Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC APD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3110489-EPA 5030 waters <br /> Matrix Spike Dup(3110489-MSD1) Source P311407-03 Prepared&Analyzed 11/21/03 -— <br /> Benzene 5 09 0 50 ugR 5 00 ND 102 81-118 2 20 <br /> Ethylbenzene 5 13 050 5 00 ND 103 89-122 2 20 <br /> Methyl tert-butyl ether 5 04 050 5 00 ND 101 77-123 0 6 20 <br /> Toluene 5 07 0 50 5 00 ND 101 84-119 3 20 <br /> Xylenes(total) 160 0 50 15 0 ND 107 86-132 0 6 20 <br /> Surrogate Dibromofluorom ethane 5 13 4 50 114 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 526 4 50 117 74-135 <br /> Surrogate Toluene-d8 530 4 50 118 84-119 <br /> Sequoia 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 13 of 15 <br />