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(D (701455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> Analytical FAX <br /> 7)792-1865 <br /> (707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P312283 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 01/12/04 18:12 <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 %REC Limits RPD Limit Notes <br /> Batch 3120679-EPA 5030E waters <br /> Laboratory Control Sample Du 3120679-BSD1 Prepared: 12/23/03 Analyzed: 12/24/03 <br /> Tert-amyl methyl ether 6.19 1.0 ugll 5.00 124 78-117 24 20 Q-LIM, <br /> QR-07 <br /> Benzene 6.31 0.50 5.00 126 81-118 18 20 Q-LIM <br /> Tert-butyl alcohol 113 20 100 113 60-147 13 20 <br /> Di-isopropyl ether 6.51 1.0 5.00 130 70-125 21 20 Q-LIM, <br /> QR-07 <br /> 1,2-Dibromoethane(EDB) 6.48 0.50 5.00 130 85-125 26 20 Q-LIM, <br /> QR-07 <br /> 1,2-Dichloroethane 6.79 0.50 5.00 136 77-126 22 20 Q-LIM, <br /> QR-07 <br /> Ethanol 113 100 100 113 55-200 4 20 <br /> Ethylbenzene 6.32 0.50 5.00 126 89-122 16 20 Q-LIM <br /> thy]tert-butyl ether 6.25 1.0 5.00 125 71-120 24 20 Q-LIM, <br /> 0 QR-07 <br /> Methyl tort-butyl ether 6.37 0.50 5.00 127 70-122 27 20 Q-LIM, <br /> QR-07 <br /> Toluene 6.38 0.50 5.00 128 84-119 18 20 Q-LIM <br /> Xylenes(total) 19.1 0.50 15.0 127 86-132 118 20 <br /> Surrogate:Dibromofluorom ethane 5.95 5.00 119 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 6.06 5.00 121 74-135 <br /> Surrogate: Toluene-d8 5.62 5.00 112 84-119 <br /> Surrogate: 4-Bromofluorobenzene 6.05 5.00 111 86-119 S-LlIW <br /> Batch 4010083-EPA 50308 waters <br /> Blank(4010083-BLKI) _ Prepared&Analyzed:01/07/04 <br /> Tert-amyl methyl ether ND l.0 ug11 <br /> Benzene ND 0.50 " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1.0 <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0.50 <br /> Ethyl tert-butyl ether ND 1.0 <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. Unless othernvise stated, results are reported on a Wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> Page 30 of 40 <br />