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� 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94454 <br /> (747)792-1865 <br /> Analytical FAX(707)792-0342 <br /> J www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P406360 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/29/04 07 39 <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 4060657-EPA 5030B waters <br /> Blank(4060657-BLK1) Prepared&Analyzed 06/30/04 <br /> Tert-amyl methyl ether ND 10 ug/I <br /> Benzene ND 050 " <br /> Tert butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1 2-Dibromoethane(EDB) ND 050 " <br /> 12-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tent-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Wiles(total) ND 050 " <br /> 'IwKurrogate Dibromofluoromethane 5 22 5 00 104 84-122 <br /> Surrogate 1 2-Dichloroethane d4 556 5 00 111 74-135 <br /> Surrogate Toluene-d8 490 Soo 98 84-119 <br /> Surrogate 4-Bromofluorobenzene 517 500 103 86-119 <br /> Laboratory Control Sample(4060657-BSI) Prepared&Analyzed 06/30/04 <br /> Tert-amyl methyl ether 5 16 10 ug/I 500 103 78-117 <br /> Benzene 525 050 500 105 81-118 <br /> Tert-butyl alcohol 969 20 100 97 60-147 <br /> Di-tsopropyl ether 5 42 10 500 118 70-125 <br /> 1 2-Dibromoethane(EDB) 520 050 Soo 104 85-125 <br /> 1 2-Dichloroethane 565 050 Soo 113 77-126 <br /> Ethanol 100 l00 100 100 55-200 <br /> Ethylbenzene 4 97 050 500 99 89-122 <br /> Ethyl tert-butyl ether 591 to Soo 118 71-I20 <br /> Methyl tert-butyl ether 549 050 500 110 70-122 <br /> Toluene 496 050 500 99 84-119 <br /> Xylenes(total) 151 050 150 101 86-132 <br /> Surrogate Dibromofliioromethane 543 500 109 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 394 500 119 74-135 <br /> Surrogate Toluene-d8 506 500 101 84-119 <br /> Surrogate 4-Bromofluorobenzene 521 Soo 104 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed m accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> 0 This analytical report must be reproduced in its entirety <br /> Page 18 of 21 <br />