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} Sequoia 1455 McDowell Blvd,North Ste D <br /> — ) Petaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> FAX(707)792 0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P312285 <br /> 2870 Gateway Oaks Dnve Suite 300 Protect Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/07/04 16 58 <br /> Volatile Orgamc 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 3120675-EPA 5030B waters <br /> Blank 3120675-BLK1Prepared&Analyzed 12/23/03 <br /> Tert-amyl methyl ether ND 1 0 ug/l <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dtbromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND l 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Wurrogate Dibramofluoromethane 592 11600 99 84-122 <br /> urrogate 1,1-Dichloroethane-d4 603 oo600 100 74-135 <br /> Surrogate 7'oluene-d8 615 11600 102 84-119 <br /> Surrogate 4-Bromofluorobenzene 614 600 102 86-119 <br /> Laboratory Control Sample(3120.675-BSI) Pre ared&Analyzed 12/23/03 <br /> Tert-amyl methyl ether 5 15 1 0 ug/l 500 103 78-117 <br /> Benzene 523 0 50 500 105 81-118 <br /> Tert-butyl alcohol 115 20 100 115 60-147 <br /> Di-isopropyl ether 5 65 1 0 5 00 113 70-125 <br /> 1,2-Dtbromoethane(EDB) 5 14 050 5 00 103 85-125 <br /> 1,2-Dichloroethane 545 050 500 109 77-126 <br /> Ethanol 143 100 100 143 55-200 <br /> Ethylbenzene 5 37 0 50 500 107 89.122 <br /> Ethyl tert-butyl ether 532 1 0 500 106 71-120 <br /> Methyl ten-butyl ether 551 0 50 5 00 110 70-122 <br /> Toluene 4 96 0 50 5 00 99 84-119 <br /> Xylenes(total) 164 050 150 109 86-132 <br /> Surrogate Dibromofluorom ethane 635 600 106 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 621 600 104 74-135 <br /> Surrogate Toluene-d8 606 600 101 84-119 <br /> Surrogate 4-Bromofluorobenzene 594 " 600 99 86-119 <br /> Sequoia 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 29 of 35 <br />