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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792 1665 <br /> Analytical <br /> FAX(707)792 0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2168,Stockton,CA P308085 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36590 Reported <br /> Sacramento CA,95833 Protect Manager Vernon P Elarth 10/16/03 11 34 <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 Levet Result %REC Limits RPD Limit Notes <br /> Batch 3080130-EPA 5030 waters <br /> Laboratory Control Sample Dup(3080130-BSDI) Prepared&Analyzed 08/07/03 <br /> Tert-amyl methyl ether 524 10 ug/l 500 105 70-116 7 20 <br /> Benzene 520 050 500 104 81-118 08 20 <br /> TW-butyl alcohol 113 20 100 1]3 62-142 09 20 <br /> Di-isopropyl ether 531 10 500 106 71-121 3 20 <br /> 1,2-Dibroinoethane(EDB) 557 050 500 11] 92-117 4 20 <br /> 1,2-Dtchloroethane 590 050 500 1]8 79-126 1 20 <br /> Ethyl tert-butyl ether 508 10 500 102 71-110 3 20 <br /> Methyl tert-butyl ether 502 050 500 100 77-123 2 20 <br /> Toluene 492 050 500 98 84-119 7 20 <br /> Surrogate Dibromofluoromethane 658 600 110 84-122 <br /> Surrogate 12-Dtchloroethane-d4 654 600 109 74-135 <br /> urrogate Toluene-d8 627 I' 600 104 84-119 <br /> urrogaie 4-Bromofluorobenzene 676 600 113 86-119 <br /> Batch 3080132-EPA 5030 waters <br /> Blank(3080132-BLKI) Prepared&Analyzed 08/07/03 <br /> Tert-amyl methyl ether ND 10 ug/l <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 <br /> 1,2-Dlbromoethane(EDB) ND 050 <br /> 1,2-Dtchloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethy]benzene ND 050 " <br /> Ethyl tent butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 472 450 105 84-722 <br /> Surrogate 1 2-Dtchloroethane-d4 4 76 450 106 74-135 <br /> Surrogate Toluene-d8 4 91 450 109 84-119 <br /> Surrogate 4-Bromofluorobenzene 454 450 101 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 in its entirety <br /> Page 14 of 19 <br />