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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> ► Analytical FAX(707)792 0342 <br /> www sequoialabs cum <br /> URS Coro-Sacramento Project Arco Site 6100,Tracy,CA P312630 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Protect Manager Jay Johnson 01/13/04 17 22 <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 Motes <br /> Batch 4010016-EPA 5030B waters <br /> Blank 4010016-BLK1 Pre ared&Anal zed 01/05/04 <br /> Tert-amyl methyl ether ND l 0 ugA <br /> Benzene ND 0 50 " <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 0 50 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 050 " <br /> ylenes(total) ND 050 " <br /> urrogate DibromoJluoromethane 5 39 5 00 108 84-122 <br /> Surrogate 12-Dichloroelhane-d4 5 32 5 00 106 74-135 <br /> Surrogate Toluene-d8 467 5 00 93 84-119 <br /> Surrogate 4-BromoJluorobenzene 4 83 500 97 86-119 <br /> Laboratory Control Sample 4010016-BS1 Prepared&Analyzed 01/05/04 <br /> Tert-amyl methyl ether 424 1 0 ugA 500 85 78-117 <br /> Benzene 4 72 050 5 00 94 81-118 <br /> Tert-butyl alcohol 95 6 20 100 96 60-147 <br /> Di-isopropyl ether 4 71 I 0 500 94 70-125 <br /> 1,2-Dibromoethane(EDB) 4 92 0 50 5 00 98 85-125 <br /> 1,2-Dichloroethane 5 08 050 5 00 102 77-126 <br /> Ethanol 88 9 100 100 89 55-200 <br /> Ethylbenzene 5 20 0 50 5 00 104 89-122 <br /> Ethyl tert-butyl ether 4 46 1 0 Soo 89 71-120 <br /> Methyl tert-butyl ether 4 47 0 50 500 89 70-122 <br /> Toluene 4 94 0 50 5 00 99 84-119 <br /> Xylenes(total) 15 6 050 15 0 104 86-132 <br /> Surrogate Dibromo luoromethane 524 5 00 105 84-122 <br /> Surrogate 12-Drchloroethane-d4 4 98 500 100 74-135 <br /> Surrogate Toluene-d8 4 75 5 00 95 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 90 500 98 86-119 <br /> Sequoia Analytical-Petaluma The results rn 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 /> 0 basis This analytical report must be reproduced in its entrrety <br /> Page 7 of 9 <br />