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4 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 wm <br /> i <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA 1`411364 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 12/04/04 14 40 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source %AEC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4110669-EPA 5030B waters/EPA 8260B <br /> Blank(4110669-BLKI) Prepared&Analyzed 11/26/04 <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 /> 12-Dibromoethane(EDB) ND 050 <br /> I <br /> I,2-Dtchloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 0 50 <br /> Xylenes(total) ND 0 50 <br /> arrogate Dibromofluoromethane 559 500 112 84-122 <br /> Surrogate 12 Dtchloroethane-d4 5 77 5 00 115 74-135 <br /> Surrogate Toluene-d8 599 500 118 84-119 <br /> i <br /> Surrogate 4-Bromofluorobenzene 675 500 135 86-119 LH <br /> Laboratory Control Sample(4110669-BSI) Prepared&Analyzed 11/26/04 <br /> Teri-amyl methyl ether 544 10 ug/l 500 109 78-117 <br /> Benzene 5 06 050 500 101 81-118 <br /> Tert-butyl alcohol 104 20 100 144 60-147 <br /> Di-isopropyl ether 507 10 5 00 101 70-125 <br /> 1,2-Dibromoethane(EDB) 586 050 500 117 85-125 <br /> 1,2-Dtchloroethane 543 050 500 I09 77-126 <br /> Ethanol 215 100 100 215 55-200 HL <br /> Ethylbenzene 546 050 " 500 109 89-122 <br /> Ethyl tert-butyl ether 526 10 Soo l05 71-120 <br /> Methyl tert-butyl ether 501 050 500 100 70-122 <br /> Toluene 530 050 500 106 84-119 <br /> Xylenes(total) 167 050 150 111 86-132 <br /> Surrogate Dibromofluoromeihane 579 500 116 84-122 <br /> Surrogate 11-Dtchloroethane-d4 560 500 112 74-135 <br /> Surrogate Toluene-d8 593 500 119 84-119 <br /> Surrogate 4-Bromofluorobenzene 572 500 114 86-119 <br /> Sequoia Analytical-Petaluma 77te results in this report apply to the samples analyzed to 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 17 of 19 <br />