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Sequoia 1455 McDowell Blvd North Ste <br /> a__ � <br /> Petaluma,CA 949544 <br /> (707)792 1865 <br /> Analytical FAX(707)792 0342 <br /> www sequotalabs cum <br /> URS Corp-Sacramento Project BP Heritage Site 11194,Tracy,Ca P502088 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Jeff Brooks 02/16/05 16 54 <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 5020202-EPA 5030E waters I EPA 8260B <br /> Blank(5020202-BI,K1) Prepared&Analyzed 02/14/05 <br /> Tert-amyl methyl ether ND 10 ugA <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tent-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 543 " 500 109 84-111 <br /> W Surrogate 1 2-Dichloroethane-d4 557 500 111 74-135 <br /> -r-gate Toluene-d8 509 500 10Z 84-119 <br /> Surrogate 4-Bromofluorobenzene 532 500 106 86-119 <br /> Laboratory Control Sample(5020202-BS1) Prepared&Analyzed 02/14/05 <br /> Tert-amyl methyl ether 525 10 ug/l 500 105 78-117 <br /> Benzene 4 72 050 500 94 81-118 <br /> Tert-butyl alcohol 946 20 100 95 60-147 <br /> Di-isopropyl ether 477 10 500 95 70-125 <br /> Ethanol 82 0 100 100 82 55-200 <br /> Ethylbenzene 505 050 500 101 89-122 <br /> Ethyl ten-butyl ether 492 1 0 5 00 98 71-120 <br /> Methyl tent-butyl ether 509 050 500 102 70-122 <br /> Toluene 4 92 050 500 98 84-119 <br /> Xylenes(total) 15 2 050 150 101 86-132 <br /> Surrogate DibromofluoromeMane 516 500 103 84-122 <br /> Surrogate 12-Dtchloroethane-d4 524 500 105 74-135 <br /> Surrogate Toluene-d8 488 500 98 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 98 500 100 86-119 <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 9 of 10 <br />