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1455 McDowell Blvd,North Ste D <br /> (i) Sequoia Petaluma,CA 94954 <br /> filer► (707)792-1862 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs coin <br /> • <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,95 83 3 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 Motes <br /> Batch 5010289-EPA 5030E waters/EPA 8260B <br /> Blank(5010289-BLKI) Prepared&Analyzed 01/26/05 <br /> Tert-amyl methyl ether ND 10 ug/l <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-tsopropyl ether ND to " <br /> 1,2-Dibromoethane(EDB) ND 0 50 " <br /> 2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzenc ND 0 50 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert butyl ether ND 0 50 " <br /> Toluene ND 050Agahk " <br /> Xylenes(total) ND 050 " <br /> arrogate Dibromofluoromethane 520 500 104 84-122 <br /> Surrogate I 1-Dtchloroethane-d4 5 16 500 103 74-135 <br /> Surrogate Toluene-d8 5 00 500 100 84-119 <br /> Surrogate 4-Bromofluorobenzene 536 Soo 107 86-119 <br /> Laboratory Control Sample(5010289-BS1) Prepared&Analyzed 01/26/05 <br /> Tert-amyl methyl ether 564 1 0 ugA 500 113 78-117 <br /> Benzene 460 050 Soo 92 81-118 <br /> Tert-butyl alcohol 887 20 100 89 60-147 <br /> Di-isopropyl ether 549 10 500 110 70-125 <br /> 1,2-Dibromoethane(EDB) 524 050 500 105 85-125 <br /> 1,2-Dtchloroethane 4 95 050 500 99 77-126 <br /> Ethanol 215 100 100 215 55-200 HL <br /> Ethylbenzene 5 34 050 " 500 107 89-122 <br /> Ethyl tert-butyl ether 522 10 500 104 71-120 <br /> Methyl tert-butyl ether 522 050 500 104 70-122 <br /> Toluene 501 050 Soo 100 84-119 <br /> Xylenes(total) 160 050 150 107 86-132 <br /> Surrogate Dibromofluoromethane 501 500 100 84-112 <br /> Surrogate 1,2-Dichloroethane-d4 5 03 500 101 74-135 <br /> Surrogate Toluene d8 525 500 105 84-119 <br /> Surrogate 4-Bromofluorobenzene 529 500 106 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 slated results are reported on a wet weight basis <br /> 0 This analytical report must be reproduced in its entirety <br /> Page 13 of 15 <br />