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5) ell1455 McDowBlvd,North Ste D <br /> Sequoia Petaluma CA 94954 <br /> Analytical (707)792-1845 <br /> FAX(707)792-0342 <br /> www sequolalabs com <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P501284 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/28/05 17 08 <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 5010267-EPA 5030B waters/EPA 8260B <br /> Blank(5010267-BLK1) Prepared&Analyzed 01/25/05 <br /> Teri-amyl methyl ether ND 1 0 ug/l <br /> Benzene ND 050 " <br /> Teri butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1 2-Dibromoethane(EDS) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 0 50 <br /> Xylenes(total) ND 050 <br /> urrogate Dibromofluoromethane 4 76 5 00 93 64-122 <br /> Surrogate 12 Dichloroethane-d4 515 5 00 103 74-135 <br /> Surrogate Toluene-d8 4 72 5 00 94 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 71 5 00 94 86-119 <br /> Laboratory Control Sample(5010267-BSI) Prepared&Analyzed 01/25/05 <br /> Tert-amyl methyl ether 5 86 1 0 ugfl 500 117 78-117 <br /> Benzene 5 32 050 500 106 81-118 <br /> Tert-butyl alcohol 965 20 100 96 60-147 <br /> Di-isopropyl ether 553 1 0 500 111 70-125 <br /> 1,2-Dibromoethane(EDB) 521 050 Soo 104 85-125 <br /> 1,2-Dichloroethane 6 17 050 500 123 77-126 <br /> Ethanol 935 100 100 94 55-200 <br /> Ethylbenzene 521 0 50 500 104 89-122 <br /> Ethyl Cert-butyl ether 526 10 500 105 71-120 <br /> Methyl tert-butyl ether 557 050 500 111 70-122 <br /> Toluene 535 050 500 107 84-119 <br /> Xylenes(total) 161 050 150 107 86-132 <br /> Surrogate Drbromofluoromerhane 496 500 99 84 122 <br /> Surrogate 1 2-Dichloroethane-d4 536 500 107 74-135 <br /> Surrogate Toluene-d8 497 500 99 84-119 <br /> Surrogate 4-Bromofluorobenzene 480 500 96 86-119 <br /> Sequoia Analytical-Petaluma 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 <br /> Page 9 of 15 <br />