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! ■ _ 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> f� ■—1 Analytical865 <br /> equoi labs c m <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P406360 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vemon P Elarth 07129/04 07 39 <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 4060657-EPA 5030B waters <br /> Matrix Spike(4060657-MSI) Source P406360-01 Prepared&Analyzed 06/30/04 <br /> Tert-amyl methyl ether 546 100 ug/i 500 ND 109 78-117 <br /> Benzene 1750 50 500 1100130 81-118 QMO1 <br /> Tert-butyl alcohol 10100 2000 10000 ND 101 60-147 <br /> Di-isopropyl ether 603 100 500 ND 121 70-125 <br /> 1 2-Dibromoethane(EDB) 514 50 500 ND 103 85 125 <br /> 12 Dichloroethane 649 50 " Soo 33 123 77 126 <br /> Ethanol 10100 10000 10000 ND 101 55-200 <br /> Ethylbenzene 1540 50 500 IWO 108 89-122 <br /> Ethyl tert-butyl ether 564 100 500 ND 113 71-120 <br /> Methyl tert-butyl ether 3940 50 Soo 3100 168 70-122 QM04 <br /> Toluene 926 50 500 420 101 84-119 <br /> Aftlenes(total) 5540 50 1500 4000 103 86-132 <br /> arrogate Dibromofluoromeihane 543 500 109 84-172 <br /> Surrogate 1 2-Dichloroethane-d4 599 500 110 74-135 <br /> Surrogate Toluene-d8 506 500 101 84-119 <br /> Surrogate 4-Bromofluorobenzene 483 500 97 86-119 <br /> Matrix Spike Dup(4060657-MSDI) Source P406360-01 Prepared&Analyzed 06/30/04 <br /> Teri amyl methyl ether 506 100 ug/l 500 ND 101 78-117 8 20 <br /> Benzene 1760 50 500 I 1 L32= 81-118 0 6 20 QMOI <br /> Tert-butyl alcohol 10000 2000 10000 ND 100 60-147 1 20 <br /> Di-isopropyl ether 582 100 500 ND 116 70-125 4 20 <br /> 1,2-Dibromoethane(EDB) 488 50 500 ND 98 85-125 5 20 <br /> 1,2-Dichloroethane 571 50 " 500 33 108 77-126 13 20 <br /> Ethanol 10500 10000 " 10000 N 105 55-200 4 20 <br /> Ethylbenzene 1640 50 500 1000128 89-122 6 20 QMOI <br /> Ethyl tert-butyl ether 553 100 500 ND 111 71-120 2 20 <br /> Methyl tert-butyl ether 4210 50 500 3100 22 70-122 7 20 QM04 <br /> Toluene 922 50 500 420 100 84-119 04 20 <br /> Xylenes(total) 5930 50 1500 4000 129 86-132 7 20 <br /> Surrogate Dibromofluoromethane 537 500 107 84-121 <br /> Surrogate 12 Dichloroethane-d4 376 500 115 74-135 <br /> Surrogate Toluene-0 489 500 98 84-119 <br /> Surrogate 4-Bromofluorobenzene 509 500 102 86-119 <br /> Sequoia 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 19 of 21 <br />