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' 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> 1865 <br /> Q�"' Analytical 342 <br /> FAX(707}792-0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P403600 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number G09JZ-0039 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/08/04 14 36 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Unita Level Result %REC Limits RPD Limit Notes <br /> Batch 4040052-EPA 5030(pres 48h) <br /> Matrix Spike(4040052-MS1) Source P403600-06 Prepared&Analyzed 04/02/04 <br /> Tert-amyl methyl ether 00535 00050 mg/kg 00500 ND 107 74-126 <br /> Benzene 00483 00050 " 00500 ND 97 75-123 <br /> Tert-butyl alcohol 0 846 010 100 ND 85 66-129 <br /> Di-Isopropyl ether 00497 00050 00500 ND 99 71-127 <br /> 1,2-Dibromoethane(EDB) 00473 00050 00500 ND 95 88-118 <br /> 1,2-Dichloroethane 00480 00050 00500 ND 96 79-119 <br /> Ethanol 0 963 020 100 ND 96 70-140 <br /> Ethylbenzene 00480 00050 00500 ND 96 65-135 <br />' Ethyl tert-butyl ether 00543 00050 " 00500 ND 109 72-123 <br /> Methyl tort-butyl ether 0 0492 00050 00500 ND 98 70-125 <br /> Toluene 00475 00050 00500 ND 95 76-123 <br /> Surrogate Dibromofluoromethane 00496 00500 97 81-126 <br /> lftrrogate 1 2-Dichloroeihane-d4 00496 00500 99 73-131 <br /> agate Toluene-d8 00514 00500 103 82-119 <br /> Matrix Spike Dup(4040052-MSD]) Source P403600-06 Prepared&Analyzed 04/02/04 <br /> Tert-amyl methyl ether 00557 00050 mg/kg 00500 ND 111 74-126 4 35 <br /> Benzene 00496 00050 00500 ND 99 75-123 3 35 <br /> Tert-butyl alcohol 0 891 010 100 ND 89 66-129 5 35 <br /> Di-isopropyl ether 00513 00050 11 00500 ND 103 71-127 3 35 <br /> 1,2-Dibromoethane(EDB) 00500 0 0050 00500 ND 100 88-118 6 35 <br /> 1,2-Dichloroethane 00491 00050 00500 ND 98 79-119 2 35 <br /> Ethanol 101 020 100 ND 101 70-140 5 35 <br /> Ethylbenzene 00499 00050 00500 ND 100 65-135 4 35 <br /> Ethyl tert-butyl ether 00559 00050 00500 ND 112 72-123 3 35 <br /> Methyl tert-butyl ether 00511 00050 00500 ND 102 70-125 4 35 <br /> Toluene 00498 00050 ry 00500 ND 100 76-123 5 35 <br /> Surrogate Dibromofluoromethane 00475 00500 95 81-126 <br /> Surrogate 12-Dtchloroethane-d4 00474 00500 95 73-131 <br /> Surrogate Toluene-d8 00508 00500 102 82-119 <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 wel weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 15 of 18 <br />