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1455 McDowell Blvd,North Ste D <br />'� •' `" <br /> Sequoia Petaluma CA 94954 <br /> `Z (707)792-1865 <br /> �� Analytical FAX equoi labs c 42 <br /> www sequo,akabs coni <br /> URS Corp-Sacramento Project Arco Site 2168,Stockton,CA P405290 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36590 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/02/04 19 44 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REC RPD <br /> An Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4050558-EPA 5030B waters <br /> Blank(4050558-BLK1) Prepared&Analyzed 05/22/04 <br /> Tert-arnyl methyl ether ND 10 ug/1 <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> .Surrogate Dibromofluoromethane 504 5 00 101 84-122 <br /> Surrogate 12-Dtchloroethane-d4 528 5 00 106 74-135 <br /> Surrogate Toluene-d8 454 500 91 84-119 <br /> Surrogate 4-Bramofluorobenzene 5 14 5 00 103 86-119 <br /> Laboratory Control Sample(4050558-BSI) Prepared&Analyzed 05/22/04 <br /> Tert-amyl methyl ether 490 1 0 ug/l 500 98 78-117 <br /> Benzene 4 87 050 500 97 81-118 <br /> Tert-butyl alcohol 107 20 i00 107 60-147 <br /> Di-isopropyl ether 495 10 Soo 99 70-125 <br /> 1 2-D,bromoethane(EBB) 521 050 500 104 85-125 <br /> 1,2-Dtchloroethane 578 050 Soo 116 77-126 <br /> Ethanol 935 t00 100 94 55-200 <br /> Ethylbenzene 5 10 050 500 102 89-122 <br /> Ethyl tert-butyl ether 5 13 10 500 103 71-120 <br /> Methyl tert-butyl ether 496 050 500 99 70-122 <br /> Toluene 505 0 50 5 00 101 84-119 <br /> Xylenes(total) 157 050 150 105 86-132 <br /> Surrogate Dibromofluoromethane 493 500 99 84-122 <br /> Surrogate 12-Dtchloroethane-d4 509 500 102 74-135 <br /> Surrogate Toluene-d8 466 5 00 93 84-119 <br /> Surrogate 4-Bromofluorobenzene 482 5 00 96 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 13 of 17 <br />