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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www seguotalabs com <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P310474 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P laarth 11/04/03 1141 <br /> Volatile Olrgame Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %RFC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3100786-EPA 5030 waters <br /> Blank(3100786-BLKI) Prepared&Analyzed 10/30/03 <br /> Tert-amyl methyl ether ND 1 0 ugll <br /> Benzene ND 050 " <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 0 50 " <br /> Aonk,Xylencs(total) ND 050 " <br /> urrogate Dibromofluoromethane 6 76 " 600 113 84-122 <br /> Surrogate I 1-Dichloroethane-d4 627 600 104 74-135 <br /> Surrogate Toluene-d8 607 600 101 84-119 <br /> Surrogate 4-Bromofluorobenzene 607 600 101 86-119 <br /> Laboratory Control Sample(3100786-BSI) Prepared&Analyzed 10/30/03 <br /> Tert-amyl methyl ether 5 12 1 0 ug(l 5 00 102 70-116 <br /> Benzene 5 30 0 50 5 00 106 81-118 <br /> Ter[-butyl alcohol 116 20 100 116 62-142 <br /> Di-isopropyl ether 5 25 1 0 5 00 105 71-121 <br /> 1,2-Dibromoethane(EDB) 5 20 0 50 " 5 00 104 92-117 <br /> 1,2-Dichloroethane 588 050 n 5 00 118 79-126 <br /> Ethanol 220 100 100 220 65-135 Q-29 <br /> Ethylbenzene 5 62 050 " 5 00 112 89-122 <br /> Ethyl tert-butyl ether 5 18 10 5 00 104 71-110 <br /> Methyl tert-butyl ether 4 82 0 50 5 00 96 77-123 <br /> Toluene 5 14 0 50 5 00 103 84-119 <br /> Xylenes(total) 167 050 150 H]1 86-132 <br /> Surrogate Dibromofluorom ethane 707 600 118 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 651 600 108 74-135 <br /> Surrogate Toluene-d8 633 600 106 84-119 <br /> Surrogate 4-Bromofluorobenzene 627 6 00 104 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 7 of 11 <br />