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_ i + <br /> 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> FAX(707)792-0342 <br /> Analytical <br /> www sequoialabs cum <br /> URS Corp-Sacramento Pro}ect Arco Site 6100,Tracy,CA P409117 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 09/21/04 09 47 <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 4090417- EPA 5030B waters <br /> Blank(4090417-BLKI) Prepared&Analyzed 09/16/04 <br /> Tert-amyl methyl ether ND to ug/l <br /> Benzene ND 050 „ <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dtbromoethane(EDB) ND 050 " <br /> 1,2-Dichloroeihane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl ten-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 050 " <br /> AlLnes(total) ND 050 " <br /> rogate Dibromofluoromethane 4 95 500 99 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 489 500 98 74-135 <br /> Surrogate Toluene48 4 91 500 98 84-119 <br /> Surrogate 4-Bromofluorobenzene 553 5 00 111 86-119 <br /> Laboratory Control Sample(4090417-BS1) Prepared&Analyzed 09/16/04 <br /> Tert-amyl methyl ether 4 70 10 ug/l 500 94 78-117 <br /> Benzene 496 0 50 Soo 99 81-118 <br /> Tert-butyl alcohol 104 20 100 104 60-147 <br /> Di-isopropyl ether 4 82 10 500 96 70-125 <br /> 1,2-Dtbromoethane(EDB) 5 19 050 5 00 104 85-125 <br /> 1,2-Dichloroethane 486 0 50 500 97 77-126 <br /> Ethanol 999 100 t00 100 55-200 <br /> Ethylbenzene 5 18 050 500 104 89-122 <br /> Ethyl tert-butyl ether 470 1 0 500 94 71-120 <br /> Methyl tert-butyl ether 4 82 0 50 Soo 96 70-122 <br /> Toluene 4 95 050 500 99 84-119 <br /> Xylenes(total) 151 050 15 0 101 86-132 <br /> Surrogate Dibromofluoromethane 4 79 500 96 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 4 70 500 94 74-135 <br /> Surrogate Toluene-d8 4 89 500 98 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 89 500 98 86-119 <br /> uola 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 15 <br />