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885 Jarvis Dnve <br /> Sequoia Morgan Hill CA 95037 <br /> (408)776 9600 <br /> Analytical FAX( 7826308 <br /> FAX <br /> sequoquoialabs cum <br /> Secor-Rancho Cordova(ARCO) Project ARCO#2133,Rancho Cordova,CA MNF0734 <br /> 3017 Kilgore Rd Suite 100 Project Number N/P Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/10/04 11 18 <br /> Purgeable Hydrocarbons and 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 Limit Notes <br /> Batch 4GO2003-EPA 5030B P/T <br /> Matrix Spoke(4G02003-MS1) Source MNF0628-03 Prepared 07/02/04 Analyzed 07/03/04 <br /> Methyl tert-butyl ether 400 50 ug/1 992 270 131 63-137 <br /> Gasoline Range Organics(C4-C12) 8560 500 4400 4100 101 70-124 <br /> Benzene 305 5 0 640 260 70 69-124 <br /> Toluene 367 5 0 297 4 7 122 78-129 <br /> Ethylbenzene 79 7 5 0 696 4 4 108 84-132 <br /> Xylenes(total) 390 5 0 337 7 4 114 83-137 <br /> Surrogate 12-Diehloroethane-d4 5 74 " 5 00 115 78-119 <br /> Matrix Spoke Dup(4602003-MSD1) Source MNF0628-03 Prepared 07/02/04 Analyzed 07/03/04 <br /> Methyl tert-butyl ether 375 5 0 ug/1 992 270 106 63-137 6 20 <br /> Gasoline Range Organics(C4 C12) 8550 500 4400 4100 101 70-124 0 1 20 <br /> Benzene 295 5 0 640 260 55 69-124 3 20 QM02 <br /> Wthyluene 360 5 0 297 4 7 120 78-129 2 20 <br /> lbenzene 815 5 0 696 4 4 111 84-132 2 20 <br /> Xylenes(total) 390 5 0 337 7 4 114 83-137 0 20 <br /> Surrogate 1 2-Dichloroethane-d4 531 5 00 106 78-119 <br /> Sequoia Analytical-Morgan Hill The results to 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 entirety <br /> Page 7 of 11 <br />