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1 <br /> 1455 McDowell Blvd North Ste <br /> Sequoia Petaluma,CA 949544 <br /> (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs cam <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P501284 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/28/05 17 08 <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 Lamt Notes <br /> Batch 5010289-EPA 5030B maters/EPA 8260B <br /> Laboratory Control Sample Dup(5010289-BSD1) Prepared&Analyzed 01/26/05 <br /> Tert-amyl methyl ether 556 10 USA 500 111 78-117 1 20 <br /> Benzene 469 050 500 94 81-118 2 20 <br /> Tert-butyl alcohol 723 20 100 72 60-147 20 20 <br /> Di-isopropyl ether 554 1 0 Soo 111 70-125 09 20 <br /> 1,2-Dibromoethane(EDB) 550 050 500 110 85-125 5 20 <br /> 1 2-Dichloroethane 491 050 500 98 77-126 08 20 <br /> Ethanol 141 100 100 141 55-200 42 20 BA <br /> Ethylbenzene 563 050 500 113 89-122 5 20 <br /> Ethyl tert-butyl ether 531 10 500 106 71-120 2 20 <br /> Methyl tert-butyl ether 5 33 050 500 107 70-122 2 20 <br /> Toluene 509 050 Soo 102 84-119 2 20 <br /> AdINIL Xylenes(total) 166 050 150 111 86-132 4 20 <br /> arrogate Dibromofluoromeihane 508 500 102 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 503 500 101 74-135 <br /> Surrogate Toluene-d8 5 17 500 103 84-119 <br /> Surrogate 4-Bromofluorobenzene 517 500 103 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 to its entirety <br /> Page 14 of 15 <br />