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1 <br /> 4DSequoia 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 /> • <br /> URS Corp-Sacramento Prosect Arco Site 2130,Stockton,CA P312285 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/07/04 16 58 <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 No, <br /> Batch 3120686-EPA 5030B waters <br /> Blank 3120686-BLKI Prepared&Analyzed 12/24/03 <br /> Tert-amyl methyl ether ND 1 0 um <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> 1,2-Dichloroethane ND 050 <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> urrogate Dibromofluoromethane 609 600 102 84-122 <br /> � <br /> Surrogate 1,2-Dichloroethane d4 S 94 600 99 74-135 <br /> Surrogate Toluene-d8 6 12 600 102 84-119 <br /> Surrogate 4-Bromofluorobenzene 613 600 102 86-119 <br /> Laboratory Control Sample(3120686-13S1� - Prepared&Analyzed 12/24/03 <br /> Tert-amyl methyl ether 209 1 0 ug/l 200 104 78-117 <br /> Benzene 20 4 050 200 102 81-118 <br /> Tert-butyl alcohol 475 20 400 119 60-147 <br /> Di-isopropyl ether 21 8 1 0 20 0 109 70-125 <br /> 1,2-Dibromoethane(EDB) 207 050 20 0 104 85-125 <br /> 1,2-Dichloroethane 22 5 050 20 0 112 77-126 <br /> Ethanol 486 100 400 122 55-200 <br /> Ethylbenzene 21 2 050 200 106 89-122 <br /> Ethyl tert-butyl ether 21 0 1 0 200 105 71-120 <br /> Methyl tert-butyl ether 21 5 0 50 200 108 70-122 <br /> Toluene 196 050 200 98 84-119 <br /> Xylenes(total) 62 9 050 60 0 105 86-132 <br /> Surrogate Dibromofluoromethane 649 600 108 84-122 <br /> Surrogate 11-Dichloroethane-d4 660 600 110 74-135 <br /> Surrogate Toluene-d8 627 600 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 607 600 101 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 31 of 35 <br />