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4D (701455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma CA 94954 <br /> Analytical FAX <br /> 7)792-0865 <br /> (707)792-0342 <br /> www sequotalabs corn <br /> URS Corp-Sacramento Project BP Heritage Site 11194,Tracy,Ca P310692 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Vernon 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 3110189-EPA 5030 waters <br /> Matrix Spike(3110189-MSt) Source P310692-01 Pre aced&Analyzed 11/11/03 <br /> Tert-amyl methyl ether 5 31 1 0 ugll 500 ND 106 70-116 <br /> Benzene 4 79 0 50 5 00 ND 96 81-118 <br /> Tert-butyl alcohol 99 7 20 100 ND 100 62-142 <br /> Dr-isopropyl ether 4 93 1 0 5 00 ND 99 71-121 <br /> Ethanol 785 100 100 ND 78 65-135 <br /> Ethylbenzene 4 94 0 50 5 00 ND 99 89-122 <br /> Ethyl tert-butyl ether 5 22 1 0 500 ND 104 71-110 <br /> Methyl Cert-butyl ether 5 36 050 5 00 ND 107 77-123 <br /> Toluene 4 93 050 500 ND 99 84-119 <br /> Xylenes(total) 15 0 0 50 15 0 ND 100 86-132 <br /> arrogate Dibromofluoromelhane 4 99 500 100 84-122 <br /> rrogate 12-Dichloroethane-d4 523 500 105 74-135 <br /> arrogate Toluene-d8 4 60 5 00 92 84-119 <br /> Matrix Spike Du 3110189-MSDt Source P310692-01 Prepared&Analyzed 11/11/03 <br /> Tert-amyl methyl ether 543 1 0 ugA 5 00 ND 109 70-116 2 20 <br /> Benzene 4 97 0 50 5 00 ND 99 81-118 4 20 <br /> Teri-butyl alcohol 108 20 100 ND 108 62-142 8 20 <br /> Di-isopropyl ether 498 1 0 500 ND 100 71-121 1 20 <br /> Ethanol 868 100 100 ND 87 65-135 10 20 <br /> Ethylbenzene 499 050 5 00 ND 100 89-122 1 20 <br /> Ethyl tert-butyl ether 5 30 1 0 500 ND 106 71-110 2 20 <br /> Methyl tert-butyl ether 5 38 050 5 00 ND 108 77-I23 0 4 20 <br /> Toluene 5 11 0 50 5 00 ND 102 84-119 4 20 <br /> Xylenes(total) 154 050 15 0 ND 103 86-132 3 20 <br /> Surrogate Dibromofluoromethane 4 97 5 00 99 84-122 <br /> Surrogate 12-Dtchloroethane-d4 5 10 S 00 102 74-135 <br /> Surrogate Toluene-d8 4 66 5 00 93 84-119 <br /> equoia 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 19 of 22 <br />