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T <br /> Sequoia 1455 McDowell Blvd North Ste D <br /> D— Petaluma CA 94954 <br /> (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www scquoialabs coin <br /> URS Corp-Sacramento Projcc.t Arco Site 6100,Tracy,CA P404555 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 05/13/04 18 04 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %RHC RPD <br /> F71y, Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4050019-EPA 5030(pres 48h) <br /> Blank(4050019-BLKI) Prepared&Analyzed 05/03/04 <br /> Tert amyl methyl ether ND 0 0050 mg/kg <br /> Benzene ND 0 0050 <br /> Ter( butyl alcohol ND 0 10 <br /> DL-isopropyl ether ND 00050 <br /> I 2-Dibromoethane(EDB) ND 0 0050 " <br /> I 2-Dichloroethane ND 00050 <br /> Ethanol ND 0 20 " <br /> Ethylbenzene ND 0 0050 " <br /> Ethyl tert-butyl ether ND 0 0050 " <br /> Methyl tent-butyl ether ND 0 0050 " <br /> Toluene ND 00050 " <br /> Xylenes(total) ND 00050 <br /> loSirrragate Drbronrofluoromethane 0 0501 00500 100 81-116 <br /> Surrogate 1 2-Dichloroethane-d4 00500 00500 100 73-131 <br /> Surrogate Toluene d8 00503 " 00500 101 82-129 <br /> Laboratory Control Sample(4050019-BSI) - Prepared&Analyzed 05/03/04 <br /> Tert-amyl methyl ether 0 0482 0 0050 mg/kg 0 0500 96 74-126 <br /> Benzene 0 0495 00050 00500 99 75-123 <br /> Tert-butyl alcohol 0 900 0 10 l 00 90 66-129 <br /> Dt-isopropyl ether 00494 00050 00500 99 71-127 <br /> l 2-Dibromoethanc(EDB) 00505 00050 00500 101 88-118 <br /> l 2-Dichloroethane 00459 00050 00500 92 79-[19 <br /> Ethanol 1 28 020 1 00 128 70-140 <br /> Ethylbenzene 0 0507 0 0050 0 0500 101 65-135 <br /> Ethyl tert-butyl ether 0 0501 0 0050 0 0500 100 72-123 <br /> Methyl tert-butyl ether 00474 0 0050 0 0500 95 70-125 <br /> Toluene 0 0491 00050 0 0500 98 76 123 <br /> Surrogate Dibromofluoroniethane 00488 00500 98 81-126 <br /> Surrogate 12 Dichloroethane-d4 0 0472 00500 94 73-131 <br /> Surrogate Toluene-d8 0 0506 00500 101 82-129 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> . of custody document Unless otherwise staled results are reported on a wet weight <br /> basis This analytical report must be reproduced to its entirety <br /> Page l 1 of 18 <br />