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1455 McDowell Blvd,Norib Ste D <br /> Sequoiaa— ) <br /> FAX Petaluma�CA94954 <br /> Analytical (707)792-1865 <br /> (707)792-0342 <br /> www sequoralabs cpm <br /> URS Corp-Sacramento Project BP Heritage Site 11194,Tracy,Ca P404694 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/25/04 13 28 <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 %RFC Limits RPD Limit Notes <br /> Batch 4050265-EPA 5030B waters <br /> Laboratory Control Sample(4050265-BSI) Prepared&Analyzed 05/12/04 <br /> Tett-amyl methyl ether 462 10 ugll 500 92 78-117 <br /> Benzene 564 050 500 113 8I-118 <br /> Tett-butyl alcohol 117 20 100 117 60-147 <br /> Di-isopropyl ether 543 1 0 500 109 70-125 <br /> Ethanol 239 100 100 239 55-200 QC01 <br /> Ethylbenzene 5 31 050 500 106 89-122 <br /> Ethyl tent-butyl ether 4 99 1 0 500 100 71-120 <br /> Methyl tert-butyl ether 498 050 500 100 70-122 <br /> Toluene 561 050 500 112 84-119 <br /> Xylenes(total) 166 0 50 150 1 1 1 86-132 <br /> Surrogate Dibromo luoromethane 4 61 4 50 102 84-122 <br /> •SSurrogate 12-Dichloroethane-d4 4 45 450 99 74-135 <br /> urrogare Toluene-d8 469 450 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 427 450 95 86-119 <br /> Laboratory Control Sample Dup(4050265-BSDI) Prepared&Analyzed 05/12104 <br /> Tert-amyl methyl ether 4 93 1 0 ug/l 500 99 78-117 6 20 <br /> Benzene 5 64 050 500 113 81-118 0 20 <br /> Tert-butyl alcohol 133 20 100 133 60-147 13 20 <br /> Di-isopropyl ether 548 1 0 Soo 110 70-125 0 9 20 <br /> Ethanol 193 100 100 193 55-200 21 20 QC20 <br /> Ethylbenzene 525 050 Soo 105 89-122 1 20 <br /> Ethyl tert-butyl ether 5 31 10 500 106 7I-120 6 20 <br /> Methyl tert butyl ether 523 050 Soo 105 70-122 5 20 <br /> Toluene 5 54 050 500 111 84-119 1 20 <br /> Xylenes(total) 165 050 15 0 110 86-132 0 6 20 <br /> Surrogate Drbrarno luoromethane 450 450 100 84-122 <br /> Surrogate 12-Dichloroethane-d4 456 450 101 74-135 <br /> Surrogate Toluene-d8 45.5 450 101 84-119 <br /> .Surrogate 4-BromoJluorobenzene 418 450 93 86-119 <br /> I <br /> Sequoia 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 18 of 21 <br /> I <br />