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Drive <br /> 4D (408) <br /> SBS lamsSequoia Morgan Hill,CA 4503750377 776 9600 <br /> i, Analytical FAX(408)782 6308 <br /> www sequoialabs com <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNH0071 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/06/04 15 45 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spoke Source %"REC RPD <br /> Analyte Result Limit Units Level Result %REC Limos RPD Limit Notes <br /> Batch 4HO5027-EPA 5030B P/T <br /> Blank(4H05027-BLKI) Prepared&Analyzed 08/05/04 <br /> tert-Amyl methyl ether ND 050 ug/l <br /> Benzene ND 0 50 " <br /> Cert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 0 50 " <br /> 1,2-Dtbromoethane(EDB) ND 0 50 " <br /> 1,2 Dtchloroethane ND 0 50 " <br /> Ethanol ND 10o IC <br /> Ethyl tert-butyl ether ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Methyl tcrt-butyl ether ND 0 50 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate 11-Dtchloroethane d4 234 " 150 94 78-129 <br /> Laboratory Control Sample(4H05027-BSI) Prepared&Analyzed 08/05/04 <br /> tart-Amyl methyl ether 101 0 50 ug/l 100 101 56 140 <br /> Benzene 9 78 050 100 98 78 124 <br /> tert-Butyl alcohol 469 20 Soo 94 0-206 <br /> Di-isopropyl ether to] 050 100 101 76-130 <br /> 1,2-Dtbromoethane(EDB) 990 050 100 99 77-132 <br /> 1,2-Dtchloroethane 103 0 50 100 103 77-136 <br /> Ethanol 166 100 200 83 31-186 IC <br /> Ethyl Cert-butyl ether 102 050 too 102 61-141 <br /> Ethylbenzene 101 0 50 100 101 84 117 <br /> Methyl tert butyl ether 999 0 50 10 0 100 63 137 <br /> Toluene 9 67 0 50 10 0 97 78 129 <br /> Xylenes(total) 306 0 5o 300 102 83 125 <br /> Surrogate 1 2-Dtchloroethane-d4 214 2 50 86 78-129 <br /> Sequoia Analytical-Morgan Hill The results in 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 0 <br /> Page 4 of 8 <br />