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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical ( 07)792-1865 <br /> FAX(7707)792-0342 <br /> www sequoialabs Com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P312285 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vemon P Elarth 01/07/04 16 58 <br /> Volatile Qrgamc 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 3120702-EPA 5030B waters <br /> Blank 3120702-BLK1 Prepared&Anal)Md 12/24/03 <br /> Tert-amyl methyl ether ND 1 0 119/1 <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 0 50 " <br /> 1,2-Dtchloroethane ND 0 50 " <br /> Ethanol 153 100 A-01 <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> W-urrogate Dibromofluoromethane 638 600 106 84-122 <br /> Surrogate 12-Dtchloroethane-d4 6 15 600 102 74-135 <br /> Surrogate Toluene-d8 6 09 600 102 84-119 <br /> Surrogate 4-Bromofluorobenzene 627 6 00 104 86-119 <br /> Laboratory Control Sample(3120702.BS1) _ Prepared&Analyzed 12/24/03 <br /> Tert-amyl methyl ether 1 03 1 0 119/1 1 00 103 78-117 <br /> Benzene 0 991 050 1 00 99 81-118 <br /> Tert-butyl alcohol 18 5 20 200 92 60-147 <br /> Di-isopropyl ether 1 13 1 0 1 00 113 70-125 <br /> 1,2-Dibromoethane(EDB) 0 972 0 50 1 00 97 85-125 <br /> 1,2-Dichloroethane 1 06 050 1 00 106 77-126 <br /> Ethanol 23 1 100 200 116 55-200 <br /> Ethylbenzene 0 941 050 1 00 94 89-122 <br /> Ethyl tert-butyl ether 1 03 1 0 1 00 103 71-120 <br /> Methyl tert-butyl ether 1 14 050 1 00 114 70-122 <br /> Toluene 0 925 050 1 00 92 84-119 <br /> Xylenes(total) 290 050 300 97 86-132 <br /> Surrogate Dibrom ofluorom ethane 6 70 600 111 84-122 <br /> Surrogate 1,2-Dtchloroethane-d4 6 72 600 112 74-135 <br /> Surrogate Toluene-d8 6 09 600 102 84-119 <br /> Surrogate 4-Bromofluorobenzene 6 23 600 104 86-119 <br /> Sequoia Analytical-Petaluma The results to 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 32 of 35 <br />