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1455 McDowell Blvd North Ste <br /> ` Sequoia Petaluma CA 949544 <br /> (707)792-1865 <br /> ► Analytical FAX(707)792-0342 <br /> l <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P312396 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vemon P Elarth 01/09/04 18 I2 <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 3120719-EPA 50308 waters <br /> Laboratory Control Sample(3320719-BS1) Prepared&Analyzed 12/27/03 <br /> Tert-amyl methyl ether 495 10 ug/I 500 99 78-117 <br /> Benzene 508 050 Soo 102 81-118 <br /> Tert-butyl alcohol 947 20 100 95 60-147 <br /> Di-isopropyl ether 528 10 500 106 70-125 <br /> 1 2-Dibromoethane(EDB) 5 02 050 500 100 85-125 <br /> 1 2-Dichloroethane 559 050 500 112 77-126 <br /> Ethanol 115 100 100 115 55-200 <br /> Ethylbenzene 5 24 050 500 105 89-122 <br /> Ethyl tert butyl ether 478 10 Soo 96 71-120 <br /> Methyl tert-butyl ether 477 050 500 95 70-122 <br /> Toluene 494 050 Soo 99 84-119 <br /> lens(total) 164 050 15 0 109 86-132 <br /> Surrogate Dibromofluoromethane 431 450 96 84-122 <br /> Surrogate 1 2-Dichloroethane d4 441 450 98 74-135 <br /> Surrogate Toluene-d8 4 61 450 102 84-119 <br /> Surrogate 4 Bromofluorobenzene 4 85 4 50 108 86-119 <br /> Laboratory Control Sample Dup(3129719-BSDI) Prepared&Analyzed 12/27/03 <br /> Tert-amyl methyl ether 500 10 ugfl 500 100 78-117 1 20 <br /> Benzene 502 050 500 100 81-118 1 20 <br /> "Pert-butyl alcohol 104 20 100 104 60-147 9 20 <br /> Di-isopropyl ether 522 10 Soo 104 70-125 1 20 <br /> 1 2-Dibromoethane(EDB) 501 050 5 00 100 85-125 0 2 20 <br /> 1 2-Dichloroethane 5 55 050 500 H] 77-126 0 7 20 <br /> Ethanol 157 100 100 157 55-200 31 20 QR-02 <br /> Ethylbenzene 517 050 500 103 89-122 1 20 <br /> Ethyl tent-butyl ether 488 10 500 98 71-120 2 20 <br /> Methyl tert-butyl ether 482 050 500 96 70-122 1 20 <br /> Toluene 4 84 050 500 97 84-119 2 20 <br /> Xylenes(total) 160 0 50 15 0 107 86-132 2 20 <br /> Surrogate Dibromofluoromethane 442 450 98 84-122 <br /> Surrogate 1 2-Dtchloroethane-d4 445 450 99 74-135 <br /> Surrogate Toluene-d8 4 62 430 103 84-119 <br /> Surrogate 4-Bromofluorobenzene 493 450 110 86-119 <br /> E�equoia 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 17 <br />