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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> ,Z_ (707)792-1865 <br /> Au aiy tical <br /> FAx(707)792-0342 <br /> www sequolal abs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrtm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P @larth 01/19/05 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 Level Result °1AEC Limits RPD Limit Notes <br /> Batch 5010152-EPA 50308 waters/EPA 8260B <br /> Matrix Spike Dup(5010152-MSD]) Source P501061-09 Prepared&Analyzed 01/12/05 <br /> Tert-amyl methyl ether 491 10 ug11 Soo ND 98 78-117 1 20 <br /> Benzene 495 050 500 ND 99 81-118 3 20 <br /> Tert-butyl alcohol 937 20 100 ND 94 60-147 2 20 <br /> Di-isopropyl ether 491 1 0 500 ND 98 70-125 4 20 <br /> 12 Dichloroethane 484 050 Soo ND 97 77-126 2 20 <br /> Ethanol 120 100 100 ND 120 55-200 14 20 <br /> Ethylbenzene 493 050 500 ND 99 89-122 06 20 <br /> Ethyl tent-butyl ether 467 1 0 500 ND 93 71-120 3 20 <br /> Methyl Cert-butyl ether 722 0 50 500 25 94 70-122 4 20 <br /> Toluene 487 050 500 ND 97 84-119 3 20 <br /> Xylenes(total) 15 3 050 150 ND 102 86-132 2 20 <br /> ,Surrogate Dibroinofluoromethane 507 Soo 101 84-111 <br /> Surrogate 12-Dichloroethane-d4 492 " .500 98 74-135 <br /> Surrogate Toluene-d8 535 5 00 107 84-119 <br /> Surrogate 4 Bromofluorobenzene 5 13 500 103 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 32 of 33 <br />