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1455 McDowell Blvd,North Ste D <br /> a_ _� Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/18/05 11 34 <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 5010012-EPA 5030B waters/EPA 82608 <br /> Blank(5010012-BLKI) Prepared&Analyzed 01/03/05 <br /> Tert-amyl methyl ether ND 10 ug/l <br /> Benzene ND 050 " <br /> Tert butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 485 500 97 84-112 <br /> Surrogate 1,2-Dichloroethane-d4 4 76 500 95 74-135 <br /> Surrogate Toluene-d8 517 500 103 84-119 <br /> Surrogate 4-Bromofluorobenzene 518 Soo 106 86-119 <br /> Laboratory Control Sample(5010012-BSI) Prepared&Analyzed 01/03/05 <br /> Tert-amyl methyl ether 481 10 ugll 500 96 78-117 <br /> Benzene 471 050 500 94 81-118 <br /> Tert-butyl alcohol 814 20 100 81 60-147 <br /> Di-isopropyl ether 479 1 0 Soo 96 70-125 <br /> 1 2-Dtchloroethane 479 050 500 96 77-126 <br /> Ethanol 157 100 100 157 55-200 <br /> Ethylbenzene 489 0 50 500 98 89 122 <br /> Ethyl tent-butyl ether 459 10 500 92 71-120 <br /> Methyl tert-butyl ether 450 050 500 90 70-122 <br /> Toluene 4 98 050 5 00 100 84-119 <br /> Xylenes(total) 154 050 15 0 103 86-132 <br /> Surrogate Dibromofluoromethane 486 500 97 84 122 <br /> Surrogate 12-Dichloroethane-d4 439 500 92 74-135 <br /> Surrogate Toluene-d8 528 500 106 84-119 <br /> Surrogate 4-Bromofluorobenzene 519 500 104 86-119 <br /> I <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 20 of 33 <br />