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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> ��► <br /> Analytical equoi labs c 65 <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P409434 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Protect Manager Vernon P Elarth 10/08/04 09 40 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source "/6REC RPD <br /> Analyte Result brit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4100134-EPA 5030B waters 1 EPA 8260B <br /> Blank(4100134-BLKI) Prepared&Analyzed 10/06/04 <br /> Tert-amyl methyl ether ND 10 ug/I <br /> Benzene ND 050 " <br /> Tert-bury]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 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> "nes(total) ND 050 <br /> �" Ir <br /> ogate Dibromofluoromethane 514 500 103 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 532 500 106 74-135 <br /> Surrogate Toluene-d8 547 500 109 84-119 <br /> Surrogate 4-Bromofluorobenzene 540 Soo 108 86-119 <br /> Laboratory Control Sample(4100134-BSI) Prepared&Analyzed 10/06/04 <br /> Tert-amyl methyl ether 548 10 ug/l 500 110 78-117 <br /> Benzene 506 0 50 Soo 101 81-118 <br /> Tert-butyl alcohol 832 20 100 83 60-147 <br /> Di-isopropyl ether 524 1 0 500 105 70-125 <br /> 1,2-Dibromoethane(EDB) 548 050 500 110 85-125 <br /> 1 2-Dichloroethane 5 16 050 500 103 77-126 <br /> Ethanol 195 100 100 195 55-200 <br /> Ethylbenzene 566 050 500 113 89-122 <br /> Ethyl tcrt-butyl ether 5 38 10 500 108 71-120 <br /> Methyl tert-butyl ether 5 34 050 500 107 70-122 <br /> Toluene 540 050 500 108 84-119 <br /> Xylenes(total) 17 3 050 150 115 86-132 <br /> Surrogate Dibromofluoromethane 540 500 108 84-122 <br /> Surrogate 12 Dichloroethane-d4 520 500 104 74-135 <br /> Surrogate Toluene-d8 555 500 111 84-119 <br /> Surrogate 4-Bromofluorobenzene 542 500 108 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 otherwrse stated results are reported on a wet weight basis <br /> 0 This analytical report must be reproduced in its entirety <br /> Page 19 of 21 <br />