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1455 McDowell Blvd,North Ste <br /> KDSequoia Petaluma,CA 949544 <br /> Analytical (707)792-1865 <br /> 0qW FAX equoi 792 0342 <br /> www sequoialahs com <br /> URS Corp-Sacramento Project BP Hentage Site 11194,Tracy,Ca P310692 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Vemon P Elarth 11/14/03 15 55 <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 3110233-EPA 5030 waters <br /> Blank(3110233-BLK1) Pre ared&Analyzed 11/12/03 <br /> Tert-amyl methyl ether ND 1 0 up/l <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> arrogate Dibromofluoromethane 4 69 4 50 104 84-122 <br /> rrogate 1 2-Dichloroethane-d4 4 30 450 96 74-135 <br /> arrogate Toluene-d8 497 450 110 84-119 <br /> Laboratory Control Sample(3110233-BS1) Pre ared&Analyzed 11/12/03 <br /> Tert-amyl methyl ether 5 14 1 0 ug/l 5 00 103 70-116 <br /> Benzene 5 34 0 50 5 00 107 81-118 <br /> Tert-butyl alcohol 108 20 100 108 62-142 <br /> Di-isopropyl ether 4 60 1 0 500 92 71-121 <br /> Ethanol 118 100 100 118 65-135 <br /> Ethylbenzene 5 63 0 50 5 00 113 89-122 <br /> Ethyl tert-butyl ether 4 76 1 0 5 00 95 71-110 <br /> Methyl tert-butyl ether 4 79 0 50 5 00 96 77-123 <br /> Toluene 5 41 0 50 5 00 108 84-119 <br /> Xylenes(total) 169 0 50 " 15 0 113 86-132 <br /> Surrogate Dibrom ofluorom ethane 4 63 4.50 103 84-112 <br /> Surrogate 12-Dichloroelhane-d4 419 4.50 93 74-135 <br /> Surrogate Toluene-d8 5 15 450 114 84-119 <br /> quota 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 20 of 22 <br />