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4D (408)885 Jarvis DriveSequoia MorganHiEl CA 956377Analytical FAX 7769600 <br /> (40 B 6308 <br /> www seqequoialaalabs com <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNA0375 <br /> 3017 Kilgore Rd Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/28/04 16 50 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4010317-EPA 5030B waters <br /> Blank(4010317-BLK1) Prepared&Analyzed 01/19/04 <br /> Tert-amyl methyl ether ND 10 ug/l <br /> Benzene ND 0 50 " <br /> Teri-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dtbromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl Cert butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> I <br /> • Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 5 64 S 00 113 84-121 <br /> Surrogate 1 2-Dichloroethane d4 5 42 5 00 108 74-135 <br /> Surrogate Toluene-d8 4 81 5 00 96 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 85 S 00 97 86-119 <br /> Laboratory Control Sample(4010317-BSI) Prepared&Analyzed 01/19/04 <br /> Tert-amyl methyl ether 5 04 1 0 iig/l 500 101 78-117 <br /> Benzene 495 050 500 99 81-118 <br /> Tert-butyl alcohol 998 20 100 100 60-147 <br /> Dt-isopropyl ether 506 1 0 5 00 101 70-125 <br /> 1,2-Dtbromoethane(EDB) 5 87 050 " 500 117 85-125 <br /> 1,2-Dichloroethane 5 55 050 500 111 77-126 <br /> Ethanol 944 100 100 94 55-200 <br /> Ethylbenzene 5 62 0 50 500 112 89-122 <br /> Ethyl Cert-butyl ether 506 1 0 5 00 101 71-120 <br /> Methyl tert-butyl ether 5 17 050 5 00 103 70-122 <br /> Toluene 5 31 050 5 00 106 84-119 <br /> Xylenes(total) 170 0 50 15 0 113 86-132 <br /> Surrogate Dibromofluoromethane 583 500 117 84-122 <br /> Surrogate 1 1-Dichloroethane-d4 5 54 5 00 111 74-135 <br /> Surrogate Toluene-d8 523 S 00 105 84-119 <br /> Surrogate 4-Bromofluorobenzene 534 5 00 111 86-119 <br /> Sequoia Analytical-Morgan Bill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 19 of 30 <br />