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• 1455 McDowell Blvd North Ste D <br /> . sequoia Petaluma CR 94954 <br /> (707)792-1865 <br /> FAX 42 <br /> Analytical wwseq 7ialabs om <br /> www sequoialabs com <br /> URS Corp-Sacramento Projecl Arco Site 6100,Tracy,CA P409117 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 09/21/04 09 47 <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 4090458- EPA 5030E waters <br /> Blank(4090458-BLKI) Prepared&Analyzed 09/18/04 <br /> Tert-amyl methyl ether ND 10 ug/1 <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1 2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzenc ND 050 " <br /> Ethyl tent-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> es(total) ND 0 50 <br /> rogate Dihromofluoromethane 497 500 99 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 488 500 98 74-135 <br /> Surrogate Toluene-d8 4 75 500 95 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 09 500 102 86-119 <br /> Laboratory Control Sample(4090458-BSI) Prepared&Analyzed 09/18/04 <br /> Tert-amyl methyl ether 498 1 0 ug/1 5 00 100 78-117 <br /> Benzene 5 12 0 50 500 102 81-118 <br /> Tert-butyl alcohol 113 20 100 113 60-147 <br /> Di-isopropyl ether 4 97 1 0 5 00 99 70-125 <br /> 1,2-Dibromoethane(EDB) 548 050 500 110 85-125 <br /> 1,2-Dichloroethane 5 14 050 500 103 77-126 <br /> Ethanol 110 100 100 110 55-200 <br /> Ethylbenzene 561 050 5 00 112 89-122 <br /> Fthyl tert-butyl ether 490 1 0 500 98 71-120 <br /> Methyl tert-butyl ether 502 050 500 100 70-122 <br /> Toluene 5 10 050 5 00 102 84-119 <br /> Xylenes(total) 161 0 50 15 0 107 86-132 <br /> Surrogate Dibromofluoromethane 495 500 99 84-112 <br /> Surrogate 1 2-Dichloroethane-d4 4 80 5 00 96 74-135 <br /> Surrogate Toluene-d8 487 500 97 84-119 <br /> Surrogate 4-Bromofluorobenzene 487 5 00 97 86-119 <br /> uota 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 14 of 15 <br />