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1 <br /> . 8851 <br /> ervts Drive <br /> Sequoia Morgan Hill CA 45037 <br /> a— (408)776-9600 Y <br /> Analytical FAX(408)782 6308 <br /> www sequoialabs com 0 <br /> Secor-Rancho Cordova(ARCO) Project ARCO#0595,Stockton,CA MND0067 <br /> 3017 Kilgore Rd Suite 100 Project Number 38983 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 04/19/04 17 33 <br /> Purgeable Hydrocarbons (C6-C10) & 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 4DO9004-EPA 5030B P/T <br /> Laboratory Control Sample Du (4D09004-BSD2) Prepared&Analyzed 04/09/04 <br /> Gasoline Range Organics(C4-C12) 441 50 ug/l 440 100 70-124 202 20 <br /> Surrogate 1 2-Dtchloroethane d4 466 Soo 932 78-129 <br /> Matrix Spike(4D09004-MSI) Source MND0185-0I Prepared 04/09/04 Analyzed 04/10/04 <br /> Methyl tort-butyl ether 1220 10 ug/l 200 1100 600 63 137 QM05 <br /> Benzene 193 10 200 ND 965 69-124 <br /> Toluene 180 10 200 ND 900 78 129 <br /> Ethylbenzene 189 10 200 NO 945 84 132 <br /> Xylenes(total) 522 10 600 ND $70 83-137 <br /> Surrogate 1 2-Dichloroethane-d4 4 66 500 93 2 78-129 <br /> Matrix Spike Dup(4D09004-MSD1) Source MND0185-01 Prepared 04/09/04 Analyzed 04/10/04 <br /> Methyl tort-butyl ether 1260 10 ug/l 200 1100 800 63-137 323 20 <br /> Benzene 198 10 200 ND 990 69-124 2 56 20 <br /> Toluene 188 10 200 ND 940 78 129 4 35 20 <br /> Ethythcnzene 195 10 200 ND 975 84 132 3 12 20 <br /> Xylenes(total) 542 10 600 NO 903 83-137 3 76 20 <br /> Surrogate 1 2-Dtchloroethane-d4 485 500 970 78-129 - <br /> I <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 0 <br /> Page 12 of 22 <br />