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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 44454 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs coin <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P403321 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03/29/04 17 13 <br /> Volatile Organic Compounds by EPA Method 8260B-Quahty 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 4030659-EPA 5030B waters , 0-' sQ l e ! YV1- <br /> Matrix Spike 4030659-MSI Sour ' <br /> Prepared&Analyzed 03/23/04 <br /> Tert-amyl methyl ether 5 9 1 0 ugn 500 ND 119 78-117 QM01 <br /> Benzene 529 050 500 ND 106 81-118 <br /> Tert-butyl alcohol 113 20 100 ND 113 60-147 <br /> Di-isopropyl ether 687 1 0 500 ND 137, 70-125 QMOI <br /> 1,2-Dibromoetbane(EDB) 579 050 500 ND 116 85-125 <br /> 1,2-Dichloroethane 6 34 050 500 ND CIS 77-126 QMOI <br /> Ethanol 105 100 100 ND 105 55-200 <br /> Ethylbenzene 5 05 050 500 ND 101 89-122 <br /> Ethyl tert-butyl ether 647 I 0 <br /> 500 ND219 71-120 QMOI <br /> Methyl cert-butyl ether 630 050 500 ND 26 70-122 QMOI <br /> Toluene 5 03 050 500 ND 101 84-119 <br /> Xylenes(total) 154 050 15 0 ND 103 86-132 <br /> Fagate Dibromofluoroniethane 582 500 116 84-122 <br /> urrogate 1 2-Dichloroethane-d4 659 500 132 74-135 <br /> Surrogate Toluene-d8 482 500 96 84-119 <br /> Surrogate 4-Bromofluorobenzene 552 500 110 86-119 <br /> Matrix Spike Du (4030659-MSD1) 5aur a P403187-1 Prepared&Analyzed 03/23/04 <br /> Tert-amyl methyl ether 6 1 1 0 ug/l 500 ND 122 78-117 3 20 QMOI <br /> Benzene 5 51 050 5 00 ND 110 81-118 4 20 <br /> Teri-butyl alcohol 120 20 100 ND 120 60-147 6 20 <br /> Di-isopropyl ether 7 54 1 0 500 ND 151 70-125 9 20 QMOI <br /> 1,2-Dibromoethane(EDB) 5 78 050 500 ND 116 85-125 02 20 <br /> 1,2-Dichloroethane 648 050 500 ND 130 77-126 2 20 QMOI <br /> Ethanol 114 100 100 ND 114 55-200 8 20 <br /> Ethylbenzene 5 01 050 5 00 ND 100 89-122 08 20 <br /> Ethyl tert-butyl ether 709 1 0 500 ND 142 71-120 9 20 QM01 <br /> Methyl tert-butyl ether 683 050 500 ND 137 70-122 8 20 QMOI <br /> Toluene 5 20 050 500 ND 104 84-119 3 20 <br /> Xylenes(total) 15 4 050 ISO ND 103 86-132 0 20 <br /> Surrogate Dibromofluoromethane 613 500 123 84-122 Sol <br /> Surrogate 12-Dichloroethane-d4 680 500 136 74-135 Sol <br /> Surrogate Toluene-d8 488 500 98 84-119 <br /> Surrogate 4-Bromofluorobenzene 504 500 101 86-119 <br /> �uoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 12 of 15 <br />