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1455 McDowelI Blvd Nortti Ste D <br /> Sequoia Pew(l ia,C 291855 <br /> Wa— ) 5 Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P309471 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/16/03 11 59 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lumt Units Level Result %REC Lirmts RPD Linut Notes <br /> I <br /> Batch 3100164-EPA 5030 waters <br /> Blank(3100164-BLKI) Prepared&Analyzed 10/07/03 <br /> Tert-amyl methyl ether ND 1 0 ugll <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tent-butyl ether ND 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 435 450 97 84-122 <br /> Surrogate 12 Dichloroethane-d4 391 " 450 87 74-135 <br /> Ourrogate Toluene-d8 462 450 103 84-119 <br /> Laboratory Control Sample(3100164-BSI) Prepared&Analyzed 10/07/03 <br /> Tert-amyl methyl ether 427 1 0 ugtl 500 85 70-116 <br /> Benzene 519 050 500 104 81-118 <br /> Tert butyl alcohol 125 20 100 125 62-142 <br /> Di-isopropyl ether 452 1 0 500 90 71-121 <br /> Ethanol 282 100 100 282 65-135 Q-LIM <br /> Ethylbenzene 547 050 500 109 89-122 <br /> Ethyl ten butyl ether 423 10 500 85 71-110 <br /> Methyl tett-butyl ether 414 050 500 83 77-123 <br /> Toluene 534 050 500 107 84-119 <br /> Xylenes(total) 160 050 150 107 86-132 <br /> Surrogate Dibromofluoromeihone 432 450 96 84-122 <br /> Surrogate 12-Dichloroethane-d4 381 450 85 74-135 <br /> Surrogate Toluene-d8 465 450 103 84-119 <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 26 of 30 <br />