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(� 1455 McDowell Blvd,North Ste D <br /> ' • / ■ \ <br /> Sequoia it ola Petaluma,r_A79 94954 <br /> 9 (707)792-1865 <br /> FAX(707)792-0342 <br /> Analytical www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2168,Stockton,CA P405290 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36590 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/02/04 19 44 <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 °/6REC Limits RPD Lima Notes <br /> Batch 4050576-EPA 5030B waters <br /> Matrix Spike(4050576-MSI) Source P405246-01 Prepared&Analyzed 05124104 <br /> Tert-amyl methyl ether 541 10 ug/l 500 ND 108 78-117 <br /> Benzene 495 050 500 ND 99 81-118 <br /> Tert-butyl alcohol 112 20 100 ND 112 60-147 <br /> Di-isopropyl ether 535 10 500 ND 107 70-125 <br /> 1,2-Dibromoethane(EDB) 582 050 500 ND 116 85-125 <br /> 1,2-Dichloroethane 616 0 50 500 ND 123 77-126 <br /> Ethanol 102 100 100 ND 102 55-200 <br /> Ethylbenzene 519 050 500 ND 104 89-122 <br /> Ethyl tert-butyl ether 567 10 500 ND 113 71-120 <br /> Methyl tert-butyl ether 563 050 500 ND 113 70-122 <br /> Toluene 531 050 500 ND 106 84-119 <br /> Xylenes(total) 165 050 150 ND 110 86-132 <br /> arrogate Dibromofluoromethane 530 500 106 84-122 <br /> Surrogate 12-Dichloroethane-d4 560 500 112 74-135 <br /> Surrogate Toluene-d8 457 500 91 84-119 <br /> Surrogate 4-Bromofluorobenzene 481 Soo 96 86-119 <br /> Matrix Spike Dup(4050576-MSDI) Source P405246-01 Prepared&Analyzed 05/24/04 <br /> Tert amyl methyl ether 5 38 10 ug/l 500 ND 108 78-117 06 20 <br /> Benzene 4 81 0 50 5 00 ND 96 81-118 3 20 <br /> Tert-butyl alcohol 106 20 100 ND 106 60-147 6 20 <br /> Di-isopropyl ether 527 1 0 5 00 ND 105 70-125 2 20 <br /> 1,2-Dibromoethane(EDB) 565 050 Soo ND 113 85-125 3 20 <br /> 1,2-Dichloroethane 603 0 50 500 ND 121 77-126 2 20 <br /> Ethanol 88 7 100 100 ND 89 55-200 14 20 <br /> Ethylbenzene 488 050 500 ND 98 89-122 6 20 <br /> Ethyl tent butyl ether 555 10 5 00 ND 111 71-120 2 20 <br /> Methyl tert-butyl ether 549 050 500 ND 110 70-122 3 20 <br /> Toluene Soo 0 50 5 00 ND 100 84-119 6 20 <br /> Xylenes(total) 15 4 050 150 ND 103 86-132 7 20 <br /> Surrogate Dibromofluoromethane 515 500 103 84-112 <br /> Surrogate 11-Dichloroethane-d4 552 500 110 74-135 <br /> Surrogate Toluene-d8 454 5 00 91 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 80 5 00 96 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 to its entirety <br /> Page 16 of 17 <br />