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} <br /> 1 <br /> 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> FAX 42 <br /> Analytical wwsequ7ialabs om <br /> www sequotalal}s com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P312396 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number- WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/09/04 18 12 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %REC _ RPD <br /> Anakyte Result Limit Units level Result %REC Limits RPD Limit Notes <br /> Batch 3120714-EPA 5030E waters <br /> Blank(3120714-BLK1) Prepared&Analyzed 12/25/03 <br /> Tert-amyl methyl ether ND 10 ugA <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <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 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Alftylencs(total) ND 050 " <br /> arrogate Dibromofluoromethane 518 500 104 84-122 <br /> Surrogate 1 1-Dichloroethane-d4 5 35 500 107 74-135 <br /> Surrogate Toluene-d8 4 70 500 94 84-119 <br /> Surrogate 4 Bromofluorobenzene 489 500 98 86-119 <br /> Laboratory Control Sample(3120714-BSI) Prepared&Analyzed 12/25/03 <br /> Teri amyl methyl ether 4 83 10 ugA 500 97 78-117 <br /> Benzene 505 050 500 101 81-118 <br /> Teri-butyl alcohol 944 20 100 94 60-147 <br /> Di-isopropyl ether 5 15 10 500 103 70-I25 <br /> 1 2-Dibromoethane(EDB) 520 050 500 104 85-125 <br /> 1 2-Dichloroethane 528 050 500 106 77 126 <br /> Ethanol 953 too 100 95 55-200 <br /> Ethylbenzene 5 17 050 500 103 89-122 <br /> Ethyl tert butyl ether 492 1 0 500 98 71-120 <br /> Methyl tert-butyl ether 490 050 500 98 70-122 <br /> Toluene 504 050 500 t0] 84-119 <br /> Xylenes(total) 15 5 050 15 0 103 86-132 <br /> Surrogate Dibromufluoromethane 506 500 101 84-111 <br /> Surrogate 12 Dichloroethane-d4 519 500 104 74-135 <br /> Surrogate Toluene d8 483 5 00 97 84-119 <br /> Surrogate 4-Bromofluorobenzene 525 500 105 86-119 <br /> equoia 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 in its entirety <br /> Page 12 of 17 <br />