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1455 Mcbawell NCA Ste D <br /> Sequoia Petalualu ma CA 94954 <br /> 9 (707)792-1865 <br /> 4 <br /> Analytical FAX(707)792 0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Proje,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 %RCC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4050057-EPA 5030(pres 48h) <br /> Laboratory Control Sample(4050057-BSI) Prepared&Analyzed 05/04/04 <br /> Tert-amyl methyl ether 00477 0 0050 mg/kg 0 0500 95 74-126 <br /> Benzene 00461 00050 0 0500 92 75-123 <br /> Tert-butyl alcohol 0 879 0 10 1 00 88 66-129 <br /> Di-isopropyl ether 00445 00050 0 0500 89 71-127 <br /> 1 2-Dibromocthane(EDB) 00487 00050 0 0500 97 88-118 <br /> 1,2-Dichloroethane 0 0442 00050 0 0500 88 79-119 <br /> Ethanol 1 16 020 1 00 116 70-140 <br /> Ethylbenzene 0 0469 00050 0 0500 94 65-135 <br /> Ethyl tert-butyl ether 0 0473 00050 0 0500 95 72-123 <br /> Methyl tort-butyl ether 0 0444 00050 0 0500 89 70-125 <br /> Toluene 00466 00050 0 0500 93 76-123 <br /> Surrogate Dibromofluoromethane 00484 00500 97 81-116 <br /> Surrogate 1 2 Dichloroethane d4 00471 " 0 0500 94 73-131 <br /> Surrogate Toluene-dS 0 0501 00500 100 82-129 <br /> Matrix Spike(4050057-MSI) Source P404606-12 Prepared&Analyzed 05/04/04 <br /> Tert-amyl methyl ether 00520 00050 mg/kg 00500 ND 104 74-126 <br /> Benzene 00534 00050 0 0500 ND 107 75-123 <br /> Tert-butyl alcohol l 00 0 IO 1 00 ND 100 66-129 <br /> Di isopropyl ether 0 0483 00050 0 0500 ND 97 71-127 <br /> 1,2-Dibromoethane(EDB) 00524 00050 0 0500 ND 105 88-118 <br /> 1 2-Dichloroethane 00507 00050 0 0500 ND 101 79-119 <br /> Ethanol l 58 0 20 1 00 0 047 153 70-140 QMOI <br /> Ethylbenzene 00537 00050 0 0500 ND 107 65-135 <br /> Ethyl tort-butyl ether 0 0509 00050 0 0500 ND 102 72-123 <br /> Methyl tert-butyl ether 00474 00050 0 0500 ND 95 70-125 <br /> Toluene 00534 00050 0 0500 ND 107 76-123 <br /> Surrogate DibromoJluoromethane 00483 00500 97 81-126 <br /> Surrogate 1 2-13ichloroethane-d4 00474 0 0500 95 73-131 <br /> Surrogate Toluene-d8 00504 00500 101 82-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> ofeustody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its Lnirrety <br /> Page 15 of 18 <br />