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' 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma CA 94954 <br /> '7 (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs Com <br /> URS Corp-Sacramento Project Arca Site 6100,Tracy,CA P403414 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 04/01/04 16 41 <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 4030800-EPA 5030B waters <br /> Blank 4030800-BLKI Prepared&Analyzed 03/27/04 <br /> Tert-amyl methyl ether ND 10 U94 <br /> Benzene ND 050 " <br /> 1 ert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1 2-Dtbromoethane(EDB) ND 050 " <br /> 1,2-Dtchloroethane 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 /> AMknes(total) ND 050 <br /> agate Dibromofluoromethane 493 300 99 84-122 <br /> Surrogate 12-Dtchloroethane-d4 496 500 99 74-135 <br /> Surrogate Toluene-d8 504 500 101 84-119 <br /> Surrogate 4-Bromofluorobenzene 518 500 104 86-119 <br /> Laboratory Control Sample 4030800-BS1 Prepared&Analyzed 03/27/04 <br /> Tert-amyl methyl ether 4 83 1 0 ug/l 5 00 97 78-117 <br /> Benzene 5 34 0 50 5 00 107 81-118 <br /> Tert-butyl alcohol 112 20 100 112 60-147 <br /> Di-isopropyl ether 4 82 1 0 5 00 96 70-125 <br /> 1,2-Dtbromoethane(EDS) 5 36 0 50 5 00 107 85-125 <br /> 1,2-Dtchloroethane 5 25 050 5 00 105 77-126 <br /> Ethanol 113 100 100 113 55-200 <br /> Ethylbenzene 5 70 0 50 5 00 114 89-122 <br /> Ethyl tert-butyl ether 4 89 1 0 5 00 98 71-120 <br /> Methyl tert-butyl ether 454 050 5 00 91 70-122 <br /> Toluene 5 41 0 50 5 00 108 84-119 <br /> Xylenes(total) 17 0 0 50 15 0 113 86-132 <br /> Surrogate Dibromofluoromethane 4 85 5 00 97 84-122 <br /> Surrogate 12-Dichloroethane-d4 459 500 92 74-135 <br /> Surrogate Toluene-d8 505 5 00 101 84-119 <br /> Surrogate 4-Bromofluorobenzene 502 5 00 100 86-119 <br /> �oia 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 8 of 10 <br />