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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> iW Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project BP Heritage Site 11194,Tracy,Ca P411027 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number N 836365 Reported <br /> Sacramento CA,95833 Project Manager JeffBmoks 12/06/04 15 39 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lima Units Level Result °/OPFC lamas RPD Lmll Notes <br /> Batch 4110095-EPA 5030B waters/EPA 8260B <br /> Blank(4110095-BLK1) Prepared&Analyzed 11/03/04 <br /> Tert-amyl methyl ether ND 1 0 ug/1 <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-bury]ether ND 10 " <br /> Methyl Cert-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 525 5 00 105 84-122 <br /> Surrogate 12-Dtchloroethane-d4 535 500 107 74-135 <br /> 0.rrogate Toluene-d8 5 71 ,I 500 114 84-119 <br /> Surrogate 4-Bromofluorobenzene 513 S 00 103 86-119 <br /> Laboratory Control Sample(4110095-BSI) Prepared&Analyzed 11/03/04 <br /> Tert-amyl methyl ether 566 10 ug/I 500 113 78-117 <br /> Benzene 577 050 500 115 81-118 <br /> Tert-butyl alcohol 81 3 20 100 81 60-147 <br /> Dmsopropyl ether 547 10 500 109 70-125 <br /> Ethanol 132 100 100 132 55-200 <br /> Ethylbenzene 5 51 050 500 110 89-122 <br /> Ethyl tort-butyl ether 564 10 500 113 71-120 <br /> Methyl tert-butyl ether 603 050 Soo 121 70-122 <br /> Toluene 552 050 500 110 84-119 <br /> Xylenes(total) 169 050 " 150 112 86-132 <br /> Surrogate Dibromofluoromethane 543 500 109 84-122 <br /> Surrogate 11-Dtchloroethane-d4 511 500 104 74-135 <br /> Surrogate Toluene-d8 586 500 117 84-119 <br /> Surrogate 4-Bromofluorobenzene 508 500 102 86-119 <br /> Sequoia Analytical-Petaluma The results to this report apply to the samples analyzed in accordance with the chair of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> 0 This analytical report must be reproduced in its entirety <br /> Page 8 of 10 <br />