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Sequoia 1455 McDowellBlvd,North Ste 4 <br /> D— ulna,CA 44954 <br /> (707)792_1865 <br /> WIdob# Analytical FAX(707)792-0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P309471 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P );larch 10/16/03 11 59 <br /> j 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 %R.EC Limtts RPD Lunt Notes <br /> Batch 3100108-EPA 5030 waters <br /> Laboratory Control Sample Dap(3100108-BSDI) Prepared&Analyzed 10/06/03 <br /> Tert-amyl methyl ether 488 10 ug/l 500 98 70-116 6 20 <br /> Benzene 493 050 500 99 81-118 1 20 <br /> Tert-butyl alcohol 106 20 100 106 62-142 12 20 <br /> Di-isopropyl ether 462 1 0 500 92 71-121 5 20 <br /> Ethanol 125 100 100 125 65-135 19 20 <br /> Ethylbenzene 493 050 Soo 99 89-122 4 20 <br /> Ethyl tent-butyl ether 484 10 Soo 97 71-110 04 20 <br /> Methyl tert-butyl ether 450 050 500 90 77-123 4 20 <br /> Toluene 549 050 500 110 84-119 04 20 <br /> Xylenes(total) 154 050 150 103 86-132 3 20 <br /> Surrogate Dibromofluoromethane 520 500 704 84-122 <br /> Surrogate I 1-Drchloroethane-d4 549 500 110 74-135 <br /> Ourrogate Toluene d8 498 500 100 84-119 <br /> Batch 3100129-EPA 5030 waters <br /> Blank(3100129-BLKI) Prepared&Analyzed 10/07/03 <br /> Tert-amyl methyl ether ND 1 0 ugli <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 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Drbromofluoromethane 423 450 94 84-121 <br /> Surrogate 1 2-Drchloroethane-d4 378 450 84 74-135 <br /> Surrogate Toluene d8 461 450 102 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,4 et weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 24 of 30 <br />