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r <br /> 1455 McDowell Blvd,North Sic D <br /> Sequoia Petaluma CA 94954 <br /> Analytical (707)792-1865 <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,95 83 3 Project Manager Vernon P );larch 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 5010287-EPA 5030B waters/EPA 8260B <br /> Blank(5010287-BLKI) Prepared&Analyzed 01/26/05 <br /> Tert-amyl methyl ether ND 1 0 ug/l <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 0 50 " <br /> 1 2-Dichloroethane ND 050 <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tent-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> .Surrogate Dibromofluoromethane 4 78 5 00 96 84-122 <br /> Surrogate 12-Dichloroethane-d4 535 500 107 74-135 <br /> Surrogate Toluene-d8 489 5 00 98 84-119 <br /> Surrogate 4-Bromofluorobenzene 491 500 98 86-119 <br /> Laboratory Control Sample(5010287-BSI) Prepared&Analyzed 01/26/05 <br /> Tert-amyl methyl ether 580 1 0 ug/1 500 116 78-117 <br /> Benzene 4 95 050 5 00 99 81-118 <br /> Tert-butyl alcohol 882 20 100 88 60-147 <br /> Di-isopropyl ether 520 10 Soo 104 70-125 <br /> 1 2-Dibromoethane(EBB) 5 33 0 50 5 00 107 85 125 <br /> 1,2-Dichloroethane 5 81 0 50 5 00 116 77-126 <br /> Ethanol 916 100 100 92 55-200 <br /> Ethylbenzene 4 92 050 5 00 98 89-122 <br /> Ethyl tert butyl ether 5 18 1 0 5 00 104 71-120 <br /> Methyl tert-butyl ether 569 050 500 114 70-122 <br /> Toluene 501 050 Soo 100 84-119 <br /> Xylenes(total) 152 050 15 0 101 86-132 <br /> Surrogate Dibromofluoromethane 4 95 5 00 99 84 122 <br /> Surrogate l 2-Dichloroethane-d4 5 33 5 00 107 74-135 <br /> Surrogate Toluene d8 482 5 00 96 84-119 <br /> Surrogate 4-Bromofluorobenzene 467 5 00 93 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 11 of 15 <br />