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} 1455 McDowell Blvd,North Ste D <br /> ! D Sequoia Petaluma,707)92-1865 <br /> �' '� Analytical FAX equot labs co 2 <br /> 1 www sequo�alabs com <br /> URS Corp-Sacramento Project Arco Site 2168,Stockton,CA P402290 <br /> 2870 Gateway Oaks Drive Suite 300 Protect Number WR36590 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 02/26/04 15 43 <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 4020455-EPA 5030E waters <br /> Blank(4020455-BLKI Prepared&Analyzed 02/20/04 <br /> Tert-amyl methyl ether ND 1 0 ug/l <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Dr-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 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> rrogate Dibromofluoromethane 5 96 600 99 84-122 <br /> Surrogate 1 2-Drchloroethane-d4 5 84 6 00 97 74-135 <br /> Surrogate Toluene-d8 5 90 600 98 84-119 <br /> Surrogate 4-Bromofluorobenzene 623 6 00 104 86-119 <br /> Laboratory Control Sample 4020455-BS1 Preriared&Anal zed An' 0104 <br /> Tert-amyl methyl ether 4 99 1 0 ngll 5 00 100 78-117 <br /> Benzene 5 05 050 n 5 00 101 81-118 <br /> Tert-butyl alcohol 110 20 100 110 60-147 <br /> Di-isopropyl ether 5 15 1 0 500 103 70-125 <br /> 1,2-Dibromoethane(EDB) 5 14 050 5 00 103 85-125 <br /> 1,2-Diehl oroethane 5 36 050 5 00 107 77-126 <br /> Ethanol 210 100 100 210 55-200 Q-29 <br /> Ethylbenzene 5 03 050 500 101 89-122 <br /> Ethyl tert-butyl ether 5 04 1 0 5 00 101 71-120 <br /> Methyl tert-butyl ether 524 0 50 5 00 105 70-122 <br /> Toluene 4 74 0 50 500 95 84-119 <br /> Xylenes(total) 15 5 050 15 0 103 86-132 <br /> Surrogate Dibromofluoromethane 6 18 6 00 103 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 6 00 600 100 74-135 <br /> Surrogate Toluene-d8 580 6 00 97 84-119 <br /> Surrogate 4-Bromofluorobenzene 642 11600 107 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated, results are reported on a wet weight <br /> . basis This analytical report must be reproduced in its entirety <br /> Page 13 of 15 <br />