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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> � (707)792-1865 <br /> 4D <br /> FAX(707)792-0342 <br /> Analytical www sequoialabs corn <br /> URS Corp-Sacramento project Arco Site 6100,Tracy,CA P406422 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 ProJei,t Manager Jay Johnson 07/15/04 10 23 <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 %RHC Limits RPD Limit Notes <br /> Batch 4070076- EPA 5030B waters <br /> Blank(4070076-BLKI) Prepared&Analyzed 07/06/04 <br /> Tert-amyl methyl ether ND 10 ug/l <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND to " <br /> 1,2-Dibromoethane(EDB) ND 050 " <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 050 " <br /> "-es(total) ND 050 <br /> VFogate Dibromofluoromethane 6 73 500 135 84-122 S01 <br /> Surrogate 1 2-Dichloroethane-d4 662 500 132 74-135 <br /> Surrogate Toluene-d8 557 500 111 84-119 <br /> Surrogate 4-Bromofluorobenzene 564 500 113 86-119 <br /> Laboratory Control Sample(4070076-BSI) Prepared&Analyzed 07/06/04 <br /> Tert-amyl methyl ether 438 1 0 ug/l 500 88 78-117 <br /> Benzene 5 56 050 5 00 111 81-118 <br /> Tert-butyl alcohol 973 20 100 97 60-147 <br /> Di-isopropyl ether 5 82 1 0 5 00 116 70-125 <br /> 1,2-Dibromoethane(EDB) 5 54 050 500 111 85-125 <br /> 1 2-Dichloroethane 641 0 50 500 128 77-126 QC01 <br /> Ethanol 183 100 100 183 55-200 <br /> Ethylbenzene 547 050 500 109 89-122 <br /> Ethyl tert-butyl ether 4 95 l 0 500 99 71-120 <br /> Methyl tert-butyl ether 5 08 050 500 102 70-122 <br /> Toluene 533 0 50 500 107 84-119 <br /> Xylenes(total) 17 l 0 50 150 114 86-132 <br /> Surrogate Dtbromofluoromethane 667 500 133 84-122 Sol <br /> Surrogate 1 2-Dichloroethane-d4 6 70 500 134 74-135 <br /> Surrogate Toluene-d8 585 500 117 84-119 <br /> Surrogate 4-Bromofluorobenzene 529 500 106 86-119 <br /> uoia Analyticai -Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless othenvrse stated results are reported on a tvet weight basis <br /> This analytical report must be reproduced to its entirety <br /> Page 15 of 18 <br />