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Sequoia <br /> 8Jarvis Drive <br /> a— —) Sequoia Morgan Hill CA 95037 <br /> (408)7769600 <br /> Analytical FAX(408)782 6308 <br /> www sequoialabs cam <br /> is <br /> Secor-Rancho Cordova(ARCO) Project ARCO#2133, Stockton,CA MPCO246 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco#2133, Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Brian Carey 04/11/06 09 55 <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 °/oREC Limits RPD Limit Notes <br /> Batch 6DO9003- EPA 50308/5035A McOH/EPA 8260B <br /> Blank(6D09003-BLKI) Prepared 04/09/06 Analyzed 04/10/06 <br /> tert-Amyl methyl ether ND 0025 mg/kg <br /> Benzene ND 0050 " <br /> Cert-Butyl alcohol ND 50 " <br /> Di isopropyl ether ND 0 025 " <br /> 1,2-Dibromoethane(EDB) ND 0025 " <br /> 12-Di chloro ethane ND 0025 " <br /> Ethanol ND 10 " <br /> Ethyl tert-butyl ether ND 0 025 " <br /> Cthylbenzene ND 0 050 " <br /> Methyl tert-butyl ether ND 0 025 " <br /> Toluene ND 0050 " <br /> nes(total) ND 0 050 <br /> " <br /> r1 me Range Organics(C4-C12) ND 25 <br /> Surrogate 1 2-Dichloroethane-d4 000403 000500 81 55-135 <br /> Laboratory Control Sample(6D09003-BSI) Prepared 04/09/06 Analyzed 04/10/06 <br /> tert-Amyl methyl ether 0 571 0 025 mg/kg 0 612 93 70-130 <br /> Benzene 0 215 0 050 0 189 114 75-140 <br /> tert-Butyl alcohol 650 50 633 103 70-120 <br /> Di isopropyl ether 0 598 0 025 0 609 98 65-135 <br /> 1,2-Dibromoethane(EDB) 0 637 0025 0 624 102 85-135 <br /> 1,2-Dichloroethane 0 566 0 025 0 582 97 65-145 <br /> Ethanol 560 10 6 18 91 15-150 <br /> Ethyl tert-butyl ether 0 570 0025 0 615 93 70-130 <br /> Ethylbenzene 0294 0050 0273 108 85-130 <br /> Methyl tert-butyl ether 0295 0025 0294 100 70-135 <br /> l oluene 1 35 0 050 142 95 80-135 <br /> Xylenes(total) 1 63 0 050 1 53 107 85-135 <br /> Gasoline Range Organics(C4-C12) 198 25 165 120 75-140 <br /> Surrogate 1 2-Dichloroethane-d4 000409 000500 82 55-135 <br /> quota Analytical - Morgan Hill The results in this report apply to the samples analysed 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 26 of 28 <br />