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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> a— ) <br /> 4 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P404664 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/17/04 14 05 <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 Nates <br /> Batch 4050190-EPA 5030B waters <br /> Matrix Spike(4050190-MSI) Source P404670-01 Prepared&Analyzed 05/10/04 <br /> Tert-amyl methyl ether 5 12 10 ugll 500 ND 102 78-117 <br /> Benzene 5 16 050 500 ND 103 81-118 <br /> Tert-butyl alcohol 103 20 100 ND 103 60-147 <br /> Di-isopropyl ether 524 10 500 ND 105 70-]25 <br /> 1,2-Dibromoethanc(EDB) 5 13 050 500 ND 103 85-125 <br /> 1,2-Dichloroethane 533 050 500 ND 107 77-126 <br /> Ethanol 947 100 100 ND 95 55-200 <br /> Ethylbenzene 5 12 050 500 ND 102 89-122 <br /> Ethyl teat-butyl ether 546 10 500 ND 109 71-120 <br /> Methyl tent-butyl ether 573 050 500 0 098 113 70-122 <br /> Toluene 499 050 500 ND 100 84-119 <br /> Xylenes(total) 159 050 150 ND 106 86-132 <br /> Wrrogate DibromoJluoromethane 492 500 98 84-122 <br /> ogate 12-Dichloroethane-d4 527 500 105 74-135 <br /> Surrogate Toluene-d8 492 500 98 84-119 <br /> Surrogate 4-BromoJluorobenzene 471 500 94 86-119 <br /> Matnx Spike Dup(4050190-MSDI) Source P404670-01 Prepared&Analyzed 05/10/04 <br /> Tert-amyl methyl ether 551 10 ug/l 500 ND ]to 78-117 7 20 <br /> Benzene 537 050 500 ND 107 81-118 4 20 <br /> Tert-butyl alcohol 109 20 100 ND 109 60-147 6 20 <br /> Di-isopropyl ether 562 10 500 ND 112 70-125 7 20 <br /> 1,2-Dibromoethane(EDB) 533 050 500 ND 107 85-125 4 20 <br /> 1 2-Drchloroethane 558 050 500 ND 112 77-126 5 20 <br /> Ethanol 102 100 too ND 102 55-200 7 20 <br /> Ethylbenzene 504 050 500 ND 101 89-122 2 20 <br /> Ethyl tert-butyl ether 578 10 500 ND 116 71-120 6 20 <br /> Methyl tent-butyl ether 562 050 500 0 098 110 70-122 2 20 <br /> Toluene 528 050 500 ND 106 84-119 6 20 <br /> Xylenes(total) 160 050 150 ND 107 86-132 06 20 <br /> Surrogate Dibromofluoromethane 533 " 500 107 84-122 <br /> Surrogate 1 1-Dichloroelhane-d4 564 500 113 74-135 <br /> Surrogate Toluene-d8 528 500 106 84-119 <br /> Surrogate 4-Brom0 luorobenzene 498 500 100 86-719 <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 8 of 9 <br />