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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> FAX Analytical wwseq(707)792-0342 <br /> om <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P503196 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/25/05 17 38 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyie Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5030223-EPA 5030E waters 1 EPA 8260B <br /> Blank(5030223-BLK1) Prepared&Analyzed 03/22/05 <br /> Tert-amyl methyl ether ND 10 ug/l <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 0 50 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> M-lenes(total) ND 050 " <br /> urrogate Dibromofluoromethane 4 42 5 00 88 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 4 60 5 00 92 74-135 <br /> Surrogate Toluene-d8 428 5 00 86 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 6.2 500 92 86-119 <br /> Laboratory Control Sample(5030223-BSI) Prepared&Analyzed 03/22/05 <br /> Tert-amyl methyl ether 481 10 ugll 500 96 78-117 <br /> Benzene 470 050 500 94 81-118 <br /> Tert-butyl alcohol 100 20 100 100 60 147 <br /> Di-isopropyl ether 482 10 500 96 70-125 <br /> 1,2-Dibromoethane(ED13) 497 0 50 Soo 99 85-125 <br /> l 2-Dichloroethane 503 050 500 101 77-126 <br /> Ethanol 88 4 100 100 88 55-200 <br /> Ethylbenzene 5 12 0 50 500 102 89-122 <br /> Ethyl tert-butyl ether 461 10 500 92 71-120 <br /> Methyl tert-butyl ether 4 77 050 500 95 70-122 <br /> Toluene 5 14 050 500 103 84-119 <br /> Xylenes(total) 15 3 0 50 15 0 102 86-132 <br /> Surrogate Dibromofluoromethane 485 500 97 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 500 500 100 74-135 <br /> Surrogate Toluene-d8 483 .500 97 84-119 <br /> Surrogate 4-Bromofluorobenzene 496 500 99 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 16 of 18 <br />