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865 Jarvis DriveSequoia Morgan <br /> ID (406)776-964p <br /> mW Analytical FAX(40B)762.6348 <br /> www sequoidabs com <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MN00371 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/03/04 16 21 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Lima Notes <br /> Batch 4G28006-EPA 5030E PIT <br /> Laboratory Control Sample Dup(4G28006-BSDI) Prepared&Analyzed 07/28/04 <br /> Surrogate 12-Dichloroethane-d4 3 24 ug/l 500 105 78-129 <br /> Laboratory Control Sample Dup(4G28006-BSD2) Prepared&Analyzed 07/28/04 <br /> Benzene 496 050 ugll 640 78 69 124 4 20 <br /> Ethylbenzene 729 050 696 105 84 132 4 20 <br /> Methyl tert-butyl ether 7 70 050 992 78 63 137 3 20 <br /> Toluene 286 050 297 96 78 129 4 20 <br /> Xylenes(total) 36 6 050 33 7 109 83 137 5 20 <br /> Gasoline Range Organics(C4-C 12) 408 50 440 93 70 124 8 20 <br /> Surrogate 12 Dichloroethane-d4 495 5 00 99 78-129 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed to 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 23 of 24 <br />